DISHWASHER WITH IMAGE-BASED DETERGENT SENSING

BACKGROUND

Dishwashers are used in many single-family and multi-family residential applications to clean dishes, silverware, cutlery, cups, glasses, pots, pans, etc. (collectively referred to herein as “utensils”). Many dishwashers rely primarily on rotatable spray arms that are disposed at the bottom and/or top of a tub and/or are mounted to a rack that holds utensils. A spray arm is coupled to a source of wash fluid and includes multiple apertures for spraying wash fluid onto utensils, and generally rotates about a central hub such that each aperture follows a circular path throughout the rotation of the spray arm. The apertures may also be angled such that force of the wash fluid exiting the spray arm causes the spray arm to rotate about the central hub.

While traditional spray arm systems are simple and mostly effective, they have the shortcoming of that they must spread the wash fluid over all areas equally to achieve a satisfactory result. In doing so, resources such as time, energy and water are generally wasted because wash fluid cannot be focused precisely where it is needed. Moreover, because spray arms follow a generally circular path, the corners of a tub may not be covered as thoroughly, leading to lower cleaning performance for utensils located in the corners of a rack. In addition, in some instances the spray jets of a spray arm may be directed to the sides of a wash tub during at least portions of the rotation, leading to unneeded noise during a wash cycle.

Various efforts have been made to attempt to customize wash cycles to improve efficiency as well as wash performance, e.g., using cameras and other types of image sensors to sense the contents of a dishwasher, as well as utilizing spray arms that provide more focused washing in particular areas of a dishwasher. Nonetheless, a significant need still exists in the art for greater efficiency and efficacy in dishwasher performance.

SUMMARY

The herein-described embodiments address these and other problems associated with the art by providing an image-based detergent sensor that in some instances is configured to sense a type of detergent for use in optimizing a wash cycle based upon the type of detergent, and that in some instances is configured to direct one or more controllable sprayers to facilitate dissolution or mixing of detergent into a wash fluid during a wash cycle.

Therefore, consistent with one aspect of the invention, a dishwasher may include a wash tub including a sump, an imaging device configured to capture images of detergent in the wash tub, and a controller coupled to the imaging device and configured to capture one or more images of the detergent and operate the dishwasher during a wash cycle based upon a detergent type determined from the captured one or more images.

In addition, in some embodiments, the controller is further configured to determine the detergent type from the captured one or more images. Further, in some embodiments, the controller is configured to communicate the captured one or more images to a remote device that determines the detergent type, and receive the detergent type from the remote device. In addition, in some embodiments, the controller is configured to operate the dishwasher based upon the detergent type by configuring one or more wash cycle parameters based on the detergent type, each of the one or more wash cycle parameters including a water temperature, a fill volume, an operation length, a number of operations, or a detergent amount.

Also, in some embodiments, the detergent type includes a detergent class selecting between one or more of a liquid detergent, a powder detergent, a detergent packet or a detergent tablet. In some embodiments, the detergent type includes a detergent product that represents a particular detergent formulation. In addition, some embodiments may also include a database storing a plurality of detergent products and from which a performance characteristic for the detergent product may be determined.

Further, in some embodiments, the controller is configured to operate the dishwasher by controlling an operation duration in the wash cycle based upon a carryover associated with the determined detergent type. In some embodiments, the controller is configured to operate the dishwasher by controlling a number of operations in the wash cycle based upon a carryover associated with the determined detergent type. In addition, some embodiments may further include a controllably-movable sprayer coupled to a fluid supply, and the controller is configured to operate the dishwasher based upon the detergent type by controlling the controllably-movable sprayer to spray fluid on the detergent. Moreover, in some embodiments, the controllably-movable sprayer includes a tubular spray element disposed in the wash tub and being rotatable about a longitudinal axis thereof, the tubular spray element including one or more apertures extending through an exterior surface thereof, and the tubular spray element in fluid communication with the fluid supply to direct fluid from the fluid supply into the wash tub through the one or more apertures, and a tubular spray element drive coupled to the tubular spray element and configured to rotate the tubular spray element between a plurality of rotational positions about the longitudinal axis thereof, where the controller is coupled to the tubular spray element drive and configured to control the tubular spray element drive to discretely direct the tubular spray element to spray fluid on the detergent.

Consistent with another aspect of the invention, a method of sensing a detergent type of a detergent disposed in a dishwasher may include performing image analysis on one or more images of the detergent captured using an imaging device positioned in the dishwasher, and determining the detergent type of the detergent based upon the image analysis performed on the captured one or more images.

Consistent with another aspect of the invention, a dishwasher may include a wash tub including a sump, an imaging device configured to capture images of detergent in the wash tub, and a controller coupled to the imaging device and configured to capture one or more images of the detergent and operate the dishwasher during a wash cycle based upon a detergent location determined from the captured one or more images.

In addition, in some embodiments, the controller is further configured to determine the detergent location from the captured one or more images. In some embodiments, the controller is configured to communicate the captured one or more images to a remote device that determines the detergent location, and receive the detergent location from the remote device. Also, in some embodiments, the detergent location is a detergent dispenser. In addition, in some embodiments, the detergent location is a detergent receptacle disposed below a detergent dispenser and into which the detergent drops when the detergent is dispensed. In some embodiments, the detergent location is on a surface of a sump or a rack of the dishwasher. Moreover, in some embodiments, the controller is configured to controllably-vary a field of view of the imaging device when capturing the one or more images to facilitate identification of the detergent location.

In addition, some embodiments may further include a controllably-movable sprayer coupled to a fluid supply, and the controller is configured to operate the dishwasher based upon the detergent location by controlling the controllably-movable sprayer to spray fluid on the detergent. Moreover, in some embodiments, the controllably-movable sprayer includes a tubular spray element disposed in the wash tub and being rotatable about a longitudinal axis thereof, the tubular spray element including one or more apertures extending through an exterior surface thereof, and the tubular spray element in fluid communication with the fluid supply to direct fluid from the fluid supply into the wash tub through the one or more apertures, and a tubular spray element drive coupled to the tubular spray element and configured to rotate the tubular spray element between a plurality of rotational positions about the longitudinal axis thereof, where the controller is coupled to the tubular spray element drive and configured to control the tubular spray element drive to discretely direct the tubular spray element to spray fluid on the detergent.

Consistent with another aspect of the invention, a method of sensing a location of a detergent disposed in a dishwasher may include performing image analysis on one or more images of the detergent captured using an imaging device positioned in the dishwasher, and determining the location of the detergent in the dishwasher based upon the image analysis performed on the captured one or more images.

Consistent with another aspect of the invention, a dishwasher may include a wash tub, a fluid supply, a controllably-movable sprayer in fluid communication with the fluid supply, and a controller coupled to the controllably-movable sprayer and configured to control the controllably-movable sprayer to spray fluid onto one or more utensils disposed in the wash tub during a wash cycle, where the controller is further configured to dissolve detergent in the wash tub by controlling the controllably-movable sprayer to spray fluid onto the detergent.

Some embodiments may further include an imaging device configured to capture images of the detergent, where the controller is coupled to the imaging device and configured to control the controllably-movable sprayer to spray fluid onto the detergent in response to a location of the detergent from one or more images of the detergent captured by the imaging device. Further, in some embodiments, the controller is configured to determine the location of the detergent from the captured one or more images. In addition, in some embodiments, the controller is configured to communicate the captured one or more images to a remote device that determines the location of the detergent, and receive the location of the detergent from the remote device.

Also, in some embodiments, the location of the detergent is a detergent dispenser, a detergent receptacle disposed below the detergent dispenser and into which the detergent drops when the detergent is dispensed, a surface of a sump of the dishwasher, or a rack of the dishwasher. Further, in some embodiments, the controller is further configured to control the imaging device to capture one or more additional images after spraying fluid onto the detergent. In some embodiments, the controller is configured to change a direction of the controllably-movable sprayer in response to a change in location or size of the detergent determined from the one or more additional images. In addition, in some embodiments, the controller is configured to discontinue spraying by the controllably-movable sprayer in response to a determination from the one or more additional images that dissolution of the detergent is complete. Moreover, in some embodiments, the controller is configured to control the controllably-movable sprayer to spray fluid onto the detergent in response to a bounding box defined in at least one of the one or more images of the detergent captured by the imaging device.

Further, in some embodiments, the controllably-movable sprayer includes a tubular spray element disposed in the wash tub and being rotatable about a longitudinal axis thereof, the tubular spray element including one or more apertures extending through an exterior surface thereof, and the tubular spray element in fluid communication with the fluid supply to direct fluid from the fluid supply into the wash tub through the one or more apertures, and a tubular spray element drive coupled to the tubular spray element and configured to rotate the tubular spray element between a plurality of rotational positions about the longitudinal axis thereof, where the controller is coupled to the tubular spray element drive and configured to control the tubular spray element drive to discretely direct the tubular spray element to spray fluid on the detergent.

Consistent with another aspect of the invention, a method of operating a dishwasher may include controlling a controllably-movable sprayer in the dishwasher to spray fluid onto one or more utensils disposed in a wash tub of the dishwasher, and dissolving detergent in the wash tub by controlling the controllably-movable sprayer to spray fluid onto the detergent.

These and other advantages and features, which characterize the invention, are set forth in the claims annexed hereto and forming a further part hereof. However, for a better understanding of the invention, and of the advantages and objectives attained through its use, reference should be made to the Drawings, and to the accompanying descriptive matter, in which there is described example embodiments of the invention. This summary is merely provided to introduce a selection of concepts that are further described below in the detailed description, and is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a dishwasher consistent with some embodiments of the invention.

FIG. 2 is a block diagram of an example control system for the dishwasher of FIG. 1.

FIG. 3 is a side perspective view of a tubular spray element and tubular spray element drive from the dishwasher of FIG. 1.

FIG. 4 is a partial cross-sectional view of the tubular spray element and tubular spray element drive of FIG. 3.

FIG. 5 is a perspective view of another dishwasher consistent with some embodiments of the invention, and incorporating an imaging system having multiple fixed cameras.

FIG. 6 is a perspective view of yet another dishwasher consistent with some embodiments of the invention, and incorporating an imaging system having multiple fixed and movable cameras.

FIG. 7 is a partial cross-sectional view of a tubular spray element and tubular spray element drive incorporating a cam-based position sensor consistent with the invention.

FIG. 8 is a functional end view of an alternative cam-based position sensor to that illustrated in FIG. 7, and incorporating multiple cam detectors.

FIG. 9 is a functional end view of another alternative cam-based position sensor to that illustrated in FIG. 7, and incorporating multiple cam detectors and a cam with multiple lobes.

FIG. 10 is a functional perspective view of a tubular spray element and imaging system incorporating an image-based position sensor consistent with the invention.

FIG. 11 is a functional end view of an alternative image-based position sensor to that illustrated in FIG. 10.

FIG. 12 is a perspective view of a dishwasher including a rack and a plurality of rack-mounted tubular spray elements incorporating distinctive features for use in image-based position sensing consistent with the invention.

FIG. 13 is a flowchart illustrating an example sequence of operations for determining a rotational position of a tubular spray element during a wash cycle using an image-based position sensor consistent with the invention.

FIG. 14 is a flowchart illustrating an example sequence of operations for focusing a tubular spray element consistent with the invention.

FIG. 15 is a flowchart illustrating an example sequence of operations for calibrating a tubular spray element consistent with the invention.

FIG. 16 is a flowchart illustrating another example sequence of operations for calibrating a tubular spray element.

FIG. 17 is a flowchart illustrating yet another example sequence of operations for calibrating a tubular spray element, and incorporating image-based spray pattern analysis consistent with the invention.

FIG. 18 is a flowchart illustrating an example sequence of operations for clearing a blockage in a sprayer consistent with the invention.

FIG. 19 is a side cross-sectional view of a dishwasher including detergent sensing consistent with some embodiments of the invention.

FIG. 20 is a side cross-sectional view of another dishwasher including detergent sensing consistent with some embodiments of the invention.

FIG. 21 is a front perspective view of a detergent dispenser and receptacle for use in connection with detergent sensing consistent with some embodiments of the invention.

FIG. 22 is a block diagram of a distributed detergent sensing system consistent with some embodiments of the invention.

FIG. 23 is a flowchart illustrating an example sequence of operations for detecting detergent in the dishwasher of FIG. 19.

FIG. 24 is a flowchart illustrating an example sequence of operations for performing a dispenser/receptacle spray out operation in the dishwasher of FIG. 19.

FIG. 25 is a flowchart illustrating an example sequence of operations for performing a detergent dissolution operation in the dishwasher of FIG. 19.

DETAILED DESCRIPTION

In various embodiments discussed hereinafter, an imaging system may be used within a dishwasher to perform various operations within the dishwasher. An imaging system, in this regard, may be considered to include one or more cameras or other imaging devices capable of capturing images within a dishwasher. The images may be captured in the visible spectrum in some embodiments, while in other embodiments other spectrums may be captured, e.g., the infrared spectrum. Imaging devices may be positioned in fixed locations within a dishwasher in some embodiments, and in other embodiments may be positioned on movable and/or controllable components, as will become more apparent below. In addition, captured images may be analyzed locally within a dishwasher in some embodiments, while in other embodiments captured images may be analyzed remotely, e.g., using a cloud-based service. Furthermore, imaging devices may generate two dimensional images in some embodiments, while in other embodiments captured images may be three dimensional in nature, e.g., to enable surface models to be generated for structures within a dishwasher, including both components of the dishwasher and articles placed in the dishwasher to be washed. Images may also be combined in some embodiments, and in some embodiments multiple images may be combined into videos clips prior to analysis.

In some embodiments consistent with the invention, and as will become more apparent below, an imaging system may be utilized in connection with one or more controllable sprayers. A controllable sprayer, in this regard, may refer to a component capable of selectively generating a spray of fluid towards any of a plurality of particular spots, locations, or regions of a dishwasher, such that through control of the sprayer, fluid may be selectively sprayed into different spots, locations or regions as desired. When paired with an imaging system consistent with the invention, therefore, a controller of a dishwasher may be capable of controlling one or more controllable sprayers to direct fluid into specific spots, locations or regions based upon images captured by an imaging system.

In some instances, a controllable sprayer may be implemented using multiple nozzles directed at different spots, locations or regions and selectively switchable between active and inactive states. In other embodiments, however, a controllable sprayer may be a controllably-movable sprayer that is capable of being moved, e.g., through rotation, translation or a combination thereof, to direct a spray of fluid to different spots, locations or regions. Moreover, while some controllably-movable sprayers may include designs such as gantry-mounted wash arms or other sprayers, controllably-rotatable wash arms, motorized sprayers, and the like, in some embodiments, a controllably-movable sprayer may be configured as a tubular spray element that is rotatable about a longitudinal axis and discretely directed through each of a plurality of rotational positions about the longitudinal axis by a tubular spray element drive to spray a fluid such as a wash liquid and/or pressurized air in a controlled direction generally transverse from the longitudinal axis about which the tubular spray element rotates.

A tubular spray element, in this regard, may be considered to include an elongated body, which may be generally cylindrical in some embodiments but may also have other cross-sectional profiles in other embodiments, and which has one or more apertures disposed on an exterior surface thereof and in fluid communication with a fluid supply, e.g., through one or more internal passageways defined therein. A tubular spray element also has a longitudinal axis generally defined along its longest dimension and about which the tubular spray element rotates, and furthermore, a tubular spray element drive is coupled to the tubular spray element to discretely direct the tubular spray element to multiple rotational positions about the longitudinal axis. In addition, when a tubular spray element is mounted on a rack and configured to selectively engage with a dock based upon the position of the rack, this longitudinal axis may also be considered to be an axis of insertion. A tubular spray element may also have a cross-sectional profile that varies along the longitudinal axis, so it will be appreciated that a tubular spray element need not have a circular cross-sectional profile along its length as is illustrated in a number embodiments herein. In addition, the one or more apertures on the exterior surface of a tubular spray element may be arranged into nozzles in some embodiments, and may be fixed or movable (e.g., rotating, oscillating, etc.) with respect to other apertures on the tubular spray element. Further, the exterior surface of a tubular spray element may be defined on multiple components of a tubular spray element, i.e., the exterior surface need not be formed by a single integral component.

In addition, in some embodiments a tubular spray element may be discretely directed by a tubular spray element drive to multiple rotational positions about the longitudinal axis to spray a fluid in predetermined directions into a wash tub of a dishwasher during a wash cycle. In some embodiments, a tubular spray element may be mounted on a movable portion of the dishwasher, e.g., a rack, and may be operably coupled to such a drive through a docking arrangement that both rotates the tubular spray element and supplies fluid to the tubular spray element when the tubular spray element is docked in the docking arrangement. In other embodiments, however, a tubular spray element may be mounted to a fixed portion of a dishwasher, e.g., a wash tub wall, whereby no docking arrangement is used. Further details regarding tubular spray elements may be found, for example, in U.S. Pub. No. 2019/0099054 filed by Digman et al., which is incorporated by reference herein.

It will be appreciated, however, that an imaging system consistent with the invention may, in some instances, be used in a dishwasher having other types of spray elements, e.g., rotatable spray arms, fixed sprayers, etc., as well as in a dishwasher having spray elements that are not discretely directable or otherwise controllable or controllably-movable. Therefore, the invention is not limited in all instances to use in connection with the various types of sprayers described herein.

Turning now to the drawings, wherein like numbers denote like parts throughout the several views, FIG. 1 illustrates an example dishwasher 10 in which the various technologies and techniques described herein may be implemented. Dishwasher 10 is a residential-type built-in dishwasher, and as such includes a front-mounted door 12 that provides access to a wash tub 16 housed within the cabinet or housing 14. Door 12 is generally hinged along a bottom edge and is pivotable between the opened position illustrated in FIG. 1 and a closed position (not shown). When door 12 is in the opened position, access is provided to one or more sliding racks, e.g., lower rack 18 and upper rack 20, within which various utensils are placed for washing. Lower rack 18 may be supported on rollers 22, while upper rack 20 may be supported on side rails 24, and each rack is movable between loading (extended) and washing (retracted) positions along a substantially horizontal direction. Control over dishwasher 10 by a user is generally managed through a control panel (not shown in FIG. 1) typically disposed on a top or front of door 12, and it will be appreciated that in different dishwasher designs, the control panel may include various types of input and/or output devices, including various knobs, buttons, lights, switches, textual and/or graphical displays, touch screens, etc. through which a user may configure one or more settings and start and stop a wash cycle.

In addition, consistent with some embodiments of the invention, dishwasher 10 may include one or more tubular spray elements (TSEs) 26 to direct a wash fluid onto utensils disposed in racks 18, 20. As will become more apparent below, tubular spray elements 26 are rotatable about respective longitudinal axes and are discretely directable by one or more tubular spray element drives (not shown in FIG. 1) to control a direction at which fluid is sprayed by each of the tubular spray elements. In some embodiments, fluid may be dispensed solely through tubular spray elements, however the invention is not so limited. For example, in some embodiments various upper and/or lower rotating spray arms may also be provided to direct additional fluid onto utensils. Still other sprayers, including various combinations of wall-mounted sprayers, rack-mounted sprayers, oscillating sprayers, fixed sprayers, rotating sprayers, focused sprayers, etc., may also be combined with one or more tubular spray elements in some embodiments of the invention.

Some tubular spray elements 26 may be fixedly mounted to a wall or other structure in wash tub 16, e.g., as may be the case for tubular spray elements 26 disposed below or adjacent lower rack 18. For other tubular spray elements 26, e.g., rack-mounted tubular spray elements, the tubular spray elements may be removably coupled to a docking arrangement such as docking arrangement 28 mounted to the rear wall of wash tub 16 in FIG. 1.

The embodiments discussed hereinafter will focus on the implementation of the hereinafter-described techniques within a hinged-door dishwasher. However, it will be appreciated that the herein-described techniques may also be used in connection with other types of dishwashers in some embodiments. For example, the herein-described techniques may be used in commercial applications in some embodiments. Moreover, at least some of the herein-described techniques may be used in connection with other dishwasher configurations, including dishwashers utilizing sliding drawers or dish sink dishwashers, e.g., a dishwasher integrated into a sink.

Now turning to FIG. 2, dishwasher 10 may be under the control of a controller 30 that receives inputs from a number of components and drives a number of components in response thereto. Controller 30 may, for example, include one or more processors and a memory (not shown) within which may be stored program code for execution by the one or more processors. The memory may be embedded in controller 30, but may also be considered to include volatile and/or non-volatile memories, cache memories, flash memories, programmable read-only memories, read-only memories, etc., as well as memory storage physically located elsewhere from controller 30, e.g., in a mass storage device or on a remote computer interfaced with controller 30.

As shown in FIG. 2, controller 30 may be interfaced with various components, including an inlet valve 32 that is coupled to a water source to introduce water into wash tub 16, which when combined with detergent, rinse agent and/or other additives, forms various wash fluids. Controller may also be coupled to a heater 34 that heats fluids, a pump 36 that recirculates wash fluid within the wash tub by pumping fluid to the wash arms and other spray devices in the dishwasher, an air supply 38 that provides a source of pressurized air for use in drying utensils in the dishwasher, a drain valve 40 that is coupled to a drain to direct fluids out of the dishwasher, and a diverter 42 that controls the routing of pumped fluid to different tubular spray elements, spray arms and/or other sprayers during a wash cycle. In some embodiments, a single pump 36 may be used, and drain valve 40 may be configured to direct pumped fluid either to a drain or to the diverter 42 such that pump 36 is used both to drain fluid from the dishwasher and to recirculate fluid throughout the dishwasher during a wash cycle. In other embodiments, separate pumps may be used for draining the dishwasher and recirculating fluid. Diverter 42 in some embodiments may be a passive diverter that automatically sequences between different outlets, while in some embodiments diverter 42 may be a powered diverter that is controllable to route fluid to specific outlets on demand. In still other embodiments, and as will be discussed in greater detail below, each tubular spray element may be separately controlled such that no separate diverter is used. Air supply 38 may be implemented as an air pump or fan in different embodiments, and may include a heater and/or other air conditioning device to control the temperature and/or humidity of the pressurized air output by the air supply.

In the illustrated embodiment, pump 36 and air supply 38 collectively implement a fluid supply for dishwasher 100, providing both a source of wash fluid and pressurized air for use respectively during wash and drying operations of a wash cycle. A wash fluid may be considered to be a fluid, generally a liquid, incorporating at least water, and in some instances, additional components such as detergent, rinse aid, and other additives. During a rinse operation, for example, the wash fluid may include only water. A wash fluid may also include steam in some instances. Pressurized air is generally used in drying operations, and may or may not be heated and/or dehumidified prior to spraying into a wash tub. It will be appreciated, however, that pressurized air may not be used for drying purposes in some embodiments, so air supply 38 may be omitted in some instances, and thus a fluid supply in some embodiments may supply various liquid wash fluids to various sprayers in the dishwasher. Moreover, in some instances, tubular spray elements may be used solely for spraying wash fluid or spraying pressurized air, with other sprayers or spray arms used for other purposes, so the invention is not limited to the use of tubular spray elements for spraying both wash fluid and pressurized air.

Controller 30 may also be coupled to a dispenser 44 to trigger the dispensing of detergent and/or rinse agent into the wash tub at appropriate points during a wash cycle. Additional sensors and actuators may also be used in some embodiments, including a temperature sensor 46 to determine a wash fluid temperature, a door switch 48 to determine when door 12 is latched, and a door lock 50 to prevent the door from being opened during a wash cycle. Moreover, controller 30 may be coupled to a user interface 52 including various input/output devices such as knobs, dials, sliders, switches, buttons, lights, textual and/or graphics displays, touch screen displays, speakers, image capture devices, microphones, etc. for receiving input from and communicating with a user. In some embodiments, controller 30 may also be coupled to one or more network interfaces 54, e.g., for interfacing with external devices via wired and/or wireless networks 56 such as Ethernet, Bluetooth, NFC, cellular and other suitable networks. External devices may include, for example, one or more user devices 58, e.g., mobile devices, desktop computers, etc., and one or more cloud services 60, e.g., as may be provided by a manufacturer of dishwasher 10. Other types of devices, e.g., devices associated with maintenance or repair personnel, may also interface with dishwasher 10 in some embodiments.

Additional components may also be interfaced with controller 30, as will be appreciated by those of ordinary skill having the benefit of the instant disclosure. For example, one or more tubular spray element (TSE) drives 62 and/or one or more tubular spray element (TSE) valves 64 may be provided in some embodiments to discretely control one or more tubular spray elements disposed in dishwasher 10, as will be discussed in greater detail below. Further, an imaging system including one or more cameras 66 (see also FIG. 1 for an example physical location of a camera 66 in dishwasher 10) may also be provided in some embodiments to provide visual information suitable for implementing some of the functionality described herein.

It will be appreciated that each tubular spray element drive 62 may also provide feedback to controller 30 in some embodiments, e.g., a current position and/or speed, although in other embodiments a separate position sensor may be used. In addition, as will become more apparent below, flow regulation to a tubular spray element may be performed without the use of a separately-controlled tubular spray element valve 64 in some embodiments, e.g., where rotation of a tubular spray element by a tubular spray element drive is used to actuate a mechanical valve.

Moreover, in some embodiments, at least a portion of controller 30 may be implemented externally from a dishwasher, e.g., within a user device 58, a cloud service 60, etc., such that at least a portion of the functionality described herein is implemented within the portion of the controller that is externally implemented. In some embodiments, controller 30 may operate under the control of an operating system and may execute or otherwise rely upon various computer software applications, components, programs, objects, modules, data structures, etc. In addition, controller 30 may also incorporate hardware logic to implement some or all of the functionality disclosed herein. Further, in some embodiments, the sequences of operations performed by controller 30 to implement the embodiments disclosed herein may be implemented using program code including one or more instructions that are resident at various times in various memory and storage devices, and that, when read and executed by one or more hardware-based processors, perform the operations embodying desired functionality. Moreover, in some embodiments, such program code may be distributed as a program product in a variety of forms, and that the invention applies equally regardless of the particular type of computer readable media used to actually carry out the distribution, including, for example, non-transitory computer readable storage media. In addition, it will be appreciated that the various operations described herein may be combined, split, reordered, reversed, varied, omitted, parallelized and/or supplemented with other techniques known in the art, and therefore, the invention is not limited to the particular sequences of operations described herein.

Numerous variations and modifications to the dishwasher illustrated in FIGS. 1-2 will be apparent to one of ordinary skill in the art, as will become apparent from the description below. Therefore, the invention is not limited to the specific implementations discussed herein.

Furthermore, additional details regarding the concepts disclosed herein may also be found in the following co-pending applications, all of which were filed on even date herewith, and all of which are incorporated by reference herein: U.S. application Ser. No. 16/588,969 (now published as U.S. Pub. No. 2021/0093154), entitled “DISHWASHER WITH IMAGE-BASED OBJECT SENSING,” U.S. application Ser. No. 16/588,034 (now issued as U.S. Pat. No. 11,026,559), entitled “DISHWASHER WITH IMAGE-BASED FLUID CONDITION SENSING,” U.S. application Ser. No. 16/588,135 (now issued as U.S. Pat. No. 11,399,690), entitled “DISHWASHER WITH CAM-BASED POSITION SENSOR,” U.S. application Ser. No. 16/587,820 (now issued as U.S. Pat. No. 11,191,416), entitled “DISHWASHER WITH IMAGE-BASED POSITION SENSOR,” and U.S. application Ser. No. 16/587,826 (now issued as U.S. Pat. No. 11,259,681) entitled “DISHWASHER WITH IMAGE-BASED DIAGNOSTICS.”

Tubular Spray Elements

Now turning to FIG. 3, in some embodiments, a dishwasher may include one or more discretely directable tubular spray elements, e.g., tubular spray element 100 coupled to a tubular spray element drive 102. Tubular spray element 100 may be configured as a tube or other elongated body disposed in a wash tub and being rotatable about a longitudinal axis L. In addition, tubular spray element 100 is generally hollow or at least includes one or more internal fluid passages that are in fluid communication with one or more apertures 104 extending through an exterior surface thereof. Each aperture 104 may function to direct a spray of fluid into the wash tub, and each aperture may be configured in various manners to provide various types of spray patterns, e.g., streams, fan sprays, concentrated sprays, etc. Apertures 104 may also in some instances be configured as fluidic nozzles providing oscillating spray patterns.

Moreover, as illustrated in FIG. 3, apertures 104 may all be positioned to direct fluid along a same radial direction from axis L, thereby focusing all fluid spray in generally the same radial direction represented by arrows R. In other embodiments, however, apertures may be arranged differently about the exterior surface of a tubular spray element, e.g., to provide spray from two, three or more radial directions, to distribute a spray over one or more arcs about the circumference of the tubular spray element, etc.

Tubular spray element 100 is in fluid communication with a fluid supply 106, e.g., through a port 108 of tubular spray element drive 102, to direct fluid from the fluid supply into the wash tub through the one or more apertures 104. Tubular spray element drive 102 is coupled to tubular spray element 100 and is configured to discretely direct the tubular spray element 100 to each of a plurality of rotational positions about longitudinal axis L. By “discretely directing,” what is meant is that tubular spray element drive 102 is capable of rotating tubular spray element 100 generally to a controlled rotational angle (or at least within a range of rotational angles) about longitudinal axis L. Thus, rather than uncontrollably rotating tubular spray element 100 or uncontrollably oscillating the tubular spray element between two fixed rotational positions, tubular spray element drive 102 is capable of intelligently focusing the spray from tubular spray element 100 between multiple rotational positions. It will also be appreciated that rotating a tubular spray element to a controlled rotational angle may refer to an absolute rotational angle (e.g., about 10 degrees from a home position) or may refer to a relative rotational angle (e.g., about 10 degrees from the current position).

Tubular spray element drive 102 is also illustrated with an electrical connection 110 for coupling to a controller 112, and a housing 114 is illustrated for housing various components in tubular spray element drive 102. In the illustrated embodiment, tubular spray element drive 102 is configured as a base that supports, through a rotary coupling, an end of the tubular spray element and effectively places the tubular spray element in fluid communication with port 108.

By having an intelligent control provided by tubular spray element drive 102 and/or controller 112, spray patterns and cycle parameters may be increased and optimized for different situations. For instance, tubular spray elements near the center of a wash tub may be configured to rotate 360 degrees, while tubular spray elements located near wash tub walls may be limited to about 180 degrees of rotation to avoid spraying directly onto any of the walls of the wash tub, which can be a significant source of noise in a dishwasher. In another instance, it may be desirable to direct or focus a tubular spray element to a fixed rotational position or over a small range of rotational positions (e.g., about 5-10 degrees) to provide concentrated spray of liquid, steam and/or air, e.g., for cleaning silverware or baked on debris in a pan. In addition, in some instances the rotational velocity of a tubular spray element may be varied throughout rotation to provide longer durations in certain ranges of rotational positions and thus provide more concentrated washing in particular areas of a wash tub, while still maintaining rotation through 360 degrees. Control over a tubular spray element may include control over rotational position, speed or rate of rotation and/or direction of rotation in different embodiments of the invention.

FIG. 4 illustrates one example implementation of tubular spray element 100 and tubular spray element drive 102 in greater detail, with housing 114 omitted for clarity. In this implementation, tubular spray element drive 102 includes an electric motor 116, which may be an alternating current (AC) or direct current (DC) motor, e.g., a brushless DC motor, a stepper motor, etc., which is mechanically coupled to tubular spray element 100 through a gearbox including a pair of gears 118, 120 respectively coupled to motor 116 and tubular spray element 100. Other manners of mechanically coupling motor 116 to tubular spray element 100 may be used in other embodiments, e.g., different numbers and/or types of gears, belt and pulley drives, magnetic drives, hydraulic drives, linkages, friction, etc.

In addition, an optional position sensor 122 may be disposed in tubular spray element drive 102 to determine a rotational position of tubular spray element 100 about axis L. Position sensor 122 may be an encoder or hall sensor in some embodiments, or may be implemented in other manners, e.g., integrated into a stepper motor, whereby the rotational position of the motor is used to determine the rotational position of the tubular spray element, or using one or more microswitches and a cam configured to engage the microswitches at predetermined rotational positions. Position sensor 122 may also sense only limited rotational positions about axis L (e.g., a home position, 30 or 45 degree increments, etc.). Further, in some embodiments, rotational position may be controlled using time and programming logic, e.g., relative to a home position, and in some instances without feedback from a motor or position sensor. Position sensor 122 may also be external to tubular spray element drive 102 in some embodiments.

An internal passage 124 in tubular spray element 100 is in fluid communication with an internal passage 126 leading to port 108 (not shown in FIG. 4) in tubular spray element drive 102 through a rotary coupling 128. In one example implementation, coupling 128 is formed by a bearing 130 mounted in passageway 126, with one or more deformable tabs 134 disposed at the end of tubular spray element 100 to secure tubular spray element 100 to tubular spray element drive 102. A seal 132, e.g., a lip seal, may also be formed between tubular spray element 100 and tubular spray element drive 102. Other manners of rotatably coupling the tubular spray element while providing fluid flow may be used in other embodiments.

In addition, it also may be desirable in some embodiments to incorporate a valve 140 into a tubular spray element drive 102 to regulate the fluid flow to tubular spray element 100. Valve 140 may be an on/off valve in some embodiments or may be a variable valve to control flow rate in other embodiments. In still other embodiments, a valve may be external to or otherwise separate from a tubular spray element drive, and may either be dedicated to the tubular spray element or used to control multiple tubular spray elements. Valve 140 may be integrated with or otherwise proximate a rotary coupling between tubular spray element 100 and tubular spray element drive 102. By regulating fluid flow to tubular spray elements, e.g., by selectively shutting off tubular spray elements, water can be conserved and/or high-pressure zones can be created by pushing all of the hydraulic power through fewer numbers of tubular spray elements.

In some embodiments, valve 140 may be actuated independent of rotation of tubular spray element 100, e.g., using an iris valve, butterfly valve, gate valve, plunger valve, piston valve, valve with a rotatable disk, ball valve, etc., and actuated by a solenoid, motor or other separate mechanism from the mechanism that rotates tubular spray element 100. In other embodiments, however, valve 140 may be actuated through rotation of tubular spray element 100. In some embodiments, for example, rotation of tubular spray element 100 to a predetermined rotational position may be close valve 140, e.g., where valve 140 includes an arcuate channel that permits fluid flow over only a range of rotational positions. As another example, a valve may be actuated through over-rotation of a tubular spray element or through counter rotation of a tubular spray element.

Tubular spray elements may be mounted within a wash tub in various manners in different embodiments, e.g., mounted to a wall (e.g., a side wall, a back wall, a top wall, a bottom wall, or a door) of a wash tub, and may be oriented in various directions, e.g., horizontally, vertically, front-to-back, side-to-side, or at an angle. It will also be appreciated that a tubular spray element drive may be disposed within a wash tub, e.g., mounted on wall of the wash tub or on a rack or other supporting structure, or alternatively some or all of the tubular spray element drive may be disposed external from a wash tub, e.g., such that a portion of the tubular spray element drive or the tubular spray element projects through an aperture in the wash tub. Alternatively, a magnetic drive could be used to drive a tubular spray element in the wash tub using an externally-mounted tubular spray element drive. Moreover, rather than being mounted in a cantilevered fashion as is the case with tubular spray element 100 of FIG. 3, a tubular spray element may also be mounted on a wall of a wash tub and supported at both ends. In still other embodiments, a tubular spray element may be rack-mounted, with either the associated tubular spray element drive also rack-mounted or alternatively mounted on a wall of the wash tub. It will also be appreciated that in some embodiments, multiple tubular spray elements may be driven by the same tubular spray element drive, e.g., using geared arrangements, belt drives, or other mechanical couplings. Further, tubular spray elements may also be movable in various directions in addition to rotating about their longitudinal axes, e.g., to move transversely to a longitudinally axis, to rotate about an axis of rotation that is transverse to a longitudinal axis, etc. In addition, deflectors may be used in combination with tubular spray elements in some embodiments to further the spread of fluid and/or prevent fluid from hitting tub walls. In some embodiments, deflectors may be integrated into a rack, while in other embodiments, deflectors may be mounted to a wall of the wash tub. In addition, deflectors may also be movable in some embodiments, e.g., to redirect fluid between multiple directions. Moreover, while in some embodiments tubular spray elements may be used solely to spray wash fluid, in other embodiments tubular spray elements may be used to spray pressurized air at utensils during a drying operation of a wash cycle, e.g., to blow off water that pools on cups and dishes after rinsing is complete. In some instances, different tubular spray elements may be used to spray wash fluid and spray pressurized air, while in other instances the same tubular spray elements may be used to alternately or concurrently spray wash liquid and pressurized air.

Additional features that may be utilized in a dishwasher including tubular spray elements are described, for example, in U.S. application Ser. Nos. 16/132,091, 16/132,106, 16/132,114, 16/132,125 filed on Sep. 14, 2018 and U.S. application Ser. No. 16/298,007 filed on Mar. 11, 2019, all of which are all assigned to the same assignee as the present application, and all of which are hereby incorporated by reference herein.

Imaging System

Now turning to FIG. 5, as noted above, a dishwasher consistent with the invention may also include an imaging system including one or more cameras or other imaging devices. FIG. 5, for example, illustrates an example dishwasher 150 including a wash tub 152 having side walls 154, a rear wall 156, a top wall 158 and a sump 160, a hinged door 162 providing access to the wash tub, and one or more racks, e.g., upper and lower racks 164, 166. While in some embodiments, tubular spray elements may be used to spray wash fluid throughout wash tub 152, in the embodiment illustrated in FIG. 5, one or more rotatable spray arms, e.g., spray arm 168 mounted to upper rack 164, may be used in lieu of or in addition to tubular spray elements.

An imaging system 170, including, for example, one or more cameras 172, may be used to collect image data within wash tub 152 for a variety of purposes. As noted above, cameras 172 may operate in the visible spectrum (e.g., RGB cameras) in some embodiments, or may operate in other spectra, e.g., the infrared spectrum (e.g., IR cameras), the ultraviolet spectrum, etc. Moreover, cameras 172 may collect two dimensional and/or three dimensional image data in different embodiments, may use range or distance sensing (e.g., using LIDAR), and may generate static images and/or video clips in various embodiments. Cameras may be disposed at various locations within a wash tub, including, for example, on any of walls 154, 156, 158, in corners between walls, on components mounted to walls (e.g., fluid supply conduits), in sump 160, on door 162, on any of racks 164, 166, or even on a spray arm 168, tubular spray element, or other movable component within a dishwasher. Moreover, different types of imaging devices may be used at different locations, or multiple imaging device of different types may be used at the same location (e.g., RGB in one location and IR in another, or RGB and IR in the same location). In addition, an imaging system 170 may also in some embodiments include one or more lights or other illumination devices 174 suitable for illuminating the wash tub to facilitate image collection. Illumination devices 174 may illuminate light in various spectra, including white light, infrared light, ultraviolet light, or even colored light in a particular segment of the visible spectra, e.g. a green, blue, or red light, or patterns of light (e.g., lines, grids, moving shapes, etc.), as may be desirable for particular applications, such as 3D applications. In addition, as illustrated by camera 172a, a camera may also capture image data outside of a wash tub, e.g., to capture images of a rack that has been extended to a loading position.

As noted above, and as is illustrated by cameras 172 and 172a, cameras may be fixed in some embodiments, and it may be desirable to utilize multiple cameras to ensure suitable coverage of all areas of a washtub for which it is desirable to collect image data. In other embodiments only a single camera may be used, and in addition, in some embodiments one or multiple cameras may be disposed on a movable component of a dishwasher to vary the viewpoint of the camera to capture different areas or perspectives within a dishwasher.

FIG. 6, for example, illustrates an example dishwasher 180 including a wash tub 182 having side walls 184, a rear wall 186, a top wall 188 and a sump 190, a hinged door 192 providing access to the wash tub, and one or more racks, e.g., upper and lower racks 194, 196. In addition, in this embodiment, a plurality of tubular spray elements 198 are used to spray wash fluid throughout wash tub 182. An imaging system 200, including, for example, one or more cameras 202, may be used to collect image data within wash tub 182 for a variety of purposes, and one or more illumination devices 204 may also be disposed in the dishwasher for illumination purposes. As noted above, however, while some of cameras 202 may be fixed, others may be mounted on movable components. For example, a camera 202a is illustrated disposed on a spray device such as tubular spray element 198a, and it will be appreciated that the field of view of the camera may be controlled by a tubular spray element drive. As another example, camera 202b is illustrates as being disposed on a movable gantry 206, which permits horizontal and/or vertical movement of the camera. It will be appreciated that a camera may be movable and/or translatable in any number of directions and/or axes in different embodiments based upon the desired application of such camera, so the invention is not limited to the specific arrangement of cameras disclosed herein.

Tubular Spray Element Position Detection

As noted above, it may be desirable in some embodiments to additionally incorporate one or more position sensors to determine the position of a tubular spray element or other sprayer in a dishwasher. Position sensor 122 of FIG. 4, for example, is an encoder or hall sensor; however, in other embodiments, it may be desirable to utilize other position sensor implementations. It will be appreciated that due to the discrete control of a spray pattern available when utilizing tubular spray elements and other types of controllable sprayers, an ability to control and sense the trajectory of washing fluid within a dishwasher is desirable in many embodiments, as doing so may improve the effectiveness of a wash cycle, reduce cycle times, and facilitate the performance of additional operations that have heretofore not been possible in conventional dishwasher designs.

FIGS. 7-9, for example, discloses various cam-based position sensor implementations whereby one or more cams that rotate in connection with rotation of a tubular spray element may be sensed by one or more cam detectors to determine a current rotational position of a tubular spray element. In some embodiments, for example, a cam-based position sensor may be configured to sense multiple rotational positions among a plurality of rotational positions to which a tubular spray element drive may rotate an associated tubular spray element, and may include one or more cam detectors and a plurality of cam lobes operably coupled to the tubular spray element to rotate therewith.

FIG. 7, for example, illustrates a portion of a dishwasher 220 where a manifold 222 configured to be mounted on a side or rear wall of dishwasher 220 (not shown in FIG. 7) supports a tubular spray element 224 having one or more nozzles 226 configured to spray in a predetermined direction represented by the arrows in FIG. 7. Manifold 222 is in a fluid communication with a fluid supply (not shown) to convey fluid to tubular spray element 224 through an inlet port 228, and it will be appreciated that tubular spray element 224 is rotatably mounted to manifold 222 but is generally not removable therefrom. It will be appreciated however that the techniques described herein may also be used in connection with a dockable tubular spray element that is removable from a docking arrangement, e.g., where a tubular spray element is rack-mounted.

A tubular spray element drive 230 includes a motor 232, drive shaft 234 that projects through the wall of manifold 222 and a drive gear 236 that engages with a gear 238 that rotates with tubular spray element 224, such that rotation of drive shaft 234 by motor 232 rotates tubular spray element 224 through the engagement of gears 236, 238. While gears 236, 238 are illustrated as being within manifold 222, in other embodiments, the gears may be external from manifold 222, e.g., on the same side as motor 232, or alternatively, within the wash tub and on the same side as tubular spray element 224.

A cam-based position sensor 240 includes a cam 242 mounted to drive shaft 234 and including a cam lobe 244 defined at a rotational position relative to nozzles 226 of tubular spray element, e.g., at the same rotational position as nozzles 226 in some embodiments. A cam detector 246, e.g., a microswitch, is also positioned at a predetermined position about cam 242 and positioned within a path of travel of cam lobe 244 such that when cam 242 is rotated to a position whereby cam lobe 244 physically engages cam detector 246, a switch is closed and a signal is generated indicating that the tubular spray element 224 is at a predetermined rotational position. In the illustrated embodiment, for example, cam detector 246 is positioned at a top vertical position such that cam detector 246 generates a signal when nozzles 226 are directed straight upwards.

To simplify the discussion, it may be assumed that gears 236, 238 are identically configured such that tubular spray element 224 rotates a full revolution in response to rotation of drive shaft 234 by a full revolution, whereby the rotational position of tubular spray element 224 is derivable directly from the rotational position of drive shaft 234. In other embodiments, however, gears 236, 238 may be differently configured such that a full rotation of drive shaft 234 rotates tubular spray element by less than or more than a full revolution.

It will be appreciated that a cam detector in other embodiments may utilize other sensing technologies. For example, a cam detector may be implemented as a hall or magnetic sensor, and cam lobes on a cam may be implemented using magnets that are sensed by the hall or magnetic sensor when adjacent thereto. As another alternative, a cam detector may include one or more electrical contacts that close an electrical circuit when a cam lobe formed of metal or another electrical conductor engages the cam detector, or may include optical components that sense light or the blockage of light from different holes or durations.

Moreover, while position sensing is performed using a cam coupled to a drive shaft in the embodiment of FIG. 7 (such that the cam lobe(s) thereof rotate about an axis of rotation that is both coincident with the drive shaft and parallel to and offset from the longitudinal axis of the tubular spray element), in other embodiments, position sensing may be performed directly on tubular spray element 224 or a component that rotates therewith. FIG. 8, for example, illustrates an end view of a tubular spray element 250 including an integrated cam 252 including a single cam lobe 254, whereby cam lobe 254 rotates about an axis of rotation that is coincident with the longitudinal axis of tubular spray element 250.

FIG. 8 also illustrates another variation whereby multiple cam detectors, here cam detectors 256a and 256b, may be disposed around the perimeter of cam 252 to sense multiple rotational positions. Cam detectors may be placed at a multitude of rotational positions and for a multitude of purposes, e.g., to detect a “home” position, to detect rotational position corresponding to an “off” position for the tubular spray element (e.g., where an associated valve for the tubular spray element that is actuated through rotation of the tubular spray element is rotated to an off or closed position), to detect a deflector alignment position, to detect a “limit” position corresponding to a range limit (e.g., when it is desirable to define ranges where a tubular spray element should not be pointed, such as a wall of the wash tub), or to detect various “zones” in a dishwasher rack where it may be desirable to focus washing.

It will also be appreciated that a cam-based position sensor may include multiple cam lobes used with one or more cam detectors, and that these multiple cam lobes may rotate about a common axis and within a common plane (as is illustrated in FIG. 9), or alternatively, about a common axis and within different planes (as is illustrated in phantom in FIG. 7).

FIG. 9, for example, illustrates another variation whereby multiple cam lobes are disposed on a cam, and one or more cam detectors are used to sense the multiple cam lobes. In this implementation, a tubular spray element 260 includes a cam 262 integrated therewith and including multiple cam lobes 264a, 264b defined at different rotational positions. Moreover, while a single cam detector may be used in some embodiments, in the illustrated embodiment four cam detectors 266a, 266b, 266c and 266d are disposed at ninety degree increments around cam 262. It will be appreciated that in this implementation, four separate positions may be distinguished from one another based upon the combination of inputs from cam detectors 266a-d, since each ninety degrees of rotation will engage a different pair of cam detectors. Other numbers and positions of cam detectors and cam lobes may be used in other embodiments, so the invention is not limited to the particular implementations illustrated herein.

Returning to FIG. 7, it will also be appreciated that multiple cams may also be used in some embodiments, For example, a second cam 242′ having a second cam lobe 244′ and sensed by a second cam detector 246′ are shown in phantom to support an ability to sense additional rotational positions. Second cam 242′ rotates in a separate plane from cam 242, and thus a “stack” of two or more coaxial cams may be used in some embodiments to provide greater flexibility in terms of position sensing, particularly where discrimination between multiple distinct positions is desired.

Now turning to FIGS. 10-12, as an alternative to cam-based position sensing, image-based position sensing may be used in some embodiments of the invention, e.g., utilizing any of the various imaging system implementations described above. It will be appreciated, for example, that imaging systems may be utilized in dishwashers for other purposes, and as such, utilizing these imaging systems additionally to sense the rotational positions of tubular spray elements and/or other controllable sprayers in a dishwasher may be beneficial in some embodiments as doing so may reduce the number of sensors used to control tubular spray elements, lower costs and/or simplify a tubular spray element drive design.

FIG. 10, for example, illustrates an example dishwasher 270 including a tubular spray element 272 including a plurality of nozzles 274 that emit a spray pattern 276 generally along a trajectory T. A camera 278 or other imaging device may be positioned with tubular spray element 272 within its field of view to capture images of the tubular spray element during use. In some embodiments, multiple cameras 278 may be used to capture the tubular spray element from multiple viewpoints, while in other embodiments a single camera may be used.

A rotational position of tubular spray element 272 may be defined about its longitudinal axis L, and in some embodiments may be represented using an angle A relative to some home position H (e.g., a top vertical position in the illustrated embodiment, although the invention is not so limited).

The rotational position of tubular spray element 272 may be detected from image data based upon image analysis of one or more images captured from one or more image devices, and in many embodiments, may be based upon detecting one or more visually distinctive features that may be used to determine the current orientation of the tubular spray element about its longitudinal axis L. In some embodiments, for example, distinctive structures defined on the generally cylindrical surface of tubular spray element 272, e.g., nozzles 274, may be detected in order to determine the rotational position.

In other embodiments, however, distinctive indicia 280 that are incorporated into tubular spray element 272 solely or at least partially for purposes of image-based position sensing may be disposed at various rotational positions on the outer surface of tubular spray element 272. In addition, in some instances, as illustrated at 282, the distinctive indicia may be textual in nature. Furthermore, as illustrated at 284, the distinctive indicia may be designed to represent a range of rotational positions, such that image analysis of the indicia may be used to determine a specific rotational position within the range. Indicia 284, for example, includes a series of parallel bars that vary in width and/or spacing such that a location within the series of parallel bars that is visible in a portion of an image can be used to determine a particular rotational position, similar in many respects to the manner that a bar code may be used to retrieve numerical information irrespective of the orientation and/or size of the bar code in an image. Other indicia arrangements that facilitate discrimination of a rotational position out of a range of rotational positions may also be used in some embodiments, e.g., combinations of letters or numbers. In some embodiments, for example, an array of numbers, letters or other distinctive features may circumscribe the generally cylindrical surface of a tubular spray element such that a rotational position may be determined based upon the relative position of one or more elements in the array.

The indicia may be formed in varying manners in different embodiments, e.g., formed as recessed or raised features on a molded tubular spray element, formed using contrasting colors or patterns, integrally molded with the surface of the tubular spray element, applied or otherwise mounted to the surface of the tubular spray element using a different material (e.g., a label or sticker), or in other suitable manners. For example, a reflective window 286 may be used in some embodiments to reflect light within the washtub and thereby provide a high contrast feature for detection. Further, in some embodiments an indicia may itself generate light, e.g., using an LED. It will be appreciated that in some instances, fluid flow, detergent, and/or obstructions created by racks and/or utensils may complicate image-based position sensing, so high contrast indicia may be desirable in some instances to accommodate such challenging conditions.

With reference to FIG. 11, it will also be appreciated that image-based position sensing may also be based on sensing the actual fluid flow or spray pattern of fluid emitted by a tubular spray element. FIG. 11, in particular, illustrates a dishwasher 290 including a tubular spray element 292 with nozzles 294 that emit a spray pattern 296. Through appropriate positioning of a camera, an angle A relative to a home position H, and in some instances, a spray pattern width W, may be sensed via image-based position sensing. While a camera positioned to view generally along the longitudinal axis of the tubular spray element has a field of view well suited for this purpose, it will be appreciated that other camera positions may also be used.

In addition, in some embodiments, image-based position sensing may also be based upon the relationship of a spray pattern to a target, e.g., the example target 298 illustrated in FIG. 11, which may be, for example, disposed on a rack, on a tub wall, or another structure inside a dishwasher and having one or more visually-identifiable indicia disposed thereon. As will become more apparent below, in some embodiments it may be desirable to utilize a target in order to calibrate a tubular spray element drive, e.g., by driving the tubular spray element 292 to an expected position at which the spray pattern 296 will hit the target 298, determining via image analysis whether the spray pattern 296 is indeed hitting the target, and if not, adjusting the position of the tubular spray element to hit the target and updating the tubular spray element drive control accordingly.

Now turning to FIG. 12, it will also be appreciated that indicia may also be positioned on other surfaces of a tubular spray element and/or on other components that move with the tubular spray elements. FIG. 12 in particular illustrates a dishwasher 300 including multiple tubular spray elements 302 supported by a rack 304 and engaged with a docking arrangement 306 disposed on a back wall of the dishwasher tub, and including one or more rotatable docking ports 308. In this embodiment, an indicia, e.g., an arrow 310, may be disposed on an end surface of a tubular spray element 302, and may be oriented such that the arrow tip may be aligned with the nozzles 312 of the tubular spray element (or any other rotational position of the tubular spray element), such that image analysis of the arrow indicia may be used to determine a rotational position of the tubular spray element. It will also be appreciated that other indicia that present visually distinct orientations throughout the rotation of the tubular spray element may be used as an alternative to an arrow indicia.

In addition, nozzles 312 are illustrated in a contrasting color that may also be used to determine the rotational position. Furthermore, each tubular spray element 302 is illustrated with an indicia (a contrasting line) 314 disposed on a docking component of the tubular spray element, which may also be used in image-based position sensing in some embodiments. Other components, e.g., gears, or rotatable components of a docking arrangement, may also include distinct indicia to facilitate position sensing in other embodiments. Furthermore, multiple colors may be used at different locations about the circumference of a tubular spray element to facilitate sensing in some embodiments.

An example process for performing image-based position sensing consistent with the invention is illustrated at 320 in FIG. 13. In order to determine rotational position, one or more images may be captured from one or more cameras having fields of view that encompass at least a portion of the tubular spray element in block 322, and any of the aforementioned types of visually distinctive features (indicia, shapes, text, colors, reflections, spray patterns) may be detected in the image(s) in block 324. The rotational position is then determined in block 326 based upon the detected elements.

It will be appreciated that a rotational position may be determined from the detected elements in a number of manners consistent with the invention. For example, various image filtering, processing, and analysis techniques may be used in some embodiments. Further, machine learning models may be constructed and trained to identify the rotational position of a tubular spray element based upon captured image data. A machine learning model may be used, for example, to determine the position of a visually distinctive feature in block 324, to determine the rotational position given the position of a visually distinctive feature in block 326, or to perform both operations to effectively output a rotational position based upon input image data.

In addition, in some embodiments, it may be desirable to monitor for misalignments of a tubular spray element to trigger a recalibration operation. In block 328, for example, if it is known that the position to which the tubular spray element is being driven differs from the sensed position, a recalibration operation may be signaled such that, during an idle time (either during or after a wash cycle) the tubular spray element is recalibrated. In some embodiments, for example, image analysis may be performed to detect when a spray pattern is not hitting an intended target when the tubular spray element is driven to a position where it is expected that the target will be hit. In some embodiments, such analysis may also be used to detect when the spray pattern has deviated from a desired pattern, and recalibration of a flow rate may also be desired (discussed in greater detail below).

Now turning to FIG. 14, it may also be desirable to use image-based position sensing to direct a tubular spray element to direct spray on a particular target, whereby a positional relationship between a spray pattern and a target may be used to control the rotational position of a tubular spray element. For example, as illustrated by process 330, a tubular spray element may be focused on a particular target by, in block 332, first rotating the tubular spray element to a position corresponding to a desired target, e.g., using process 320 to monitor TSE position until a desired position is reached. The target may be a particular component in the dishwasher, or a particular utensil in the dishwasher, or even a particular location on a component or utensil in the dishwasher (e.g., a particular spot of soil on a utensil). The target location may be determined, for example, based upon image analysis of one or more images captured in the dishwasher (from which, for example, a desired angle of spray is determined from the previously known position of a tubular spray element), or based upon a previously-known rotational position corresponding to a particular target (e.g., where it is known that the silverware basket is between 120 and 135 degrees from the home position of a particular tubular spray element).

Next, once the tubular spray element is rotated to the desired position, one or more images are captured in block 334 while a spray pattern is directed on the target, and image analysis is performed to determine whether the spray pattern is hitting the desired target. If so, no adjustment is needed. If not, however, block 336 may adjust the position of the tubular spray element as needed to focus the tubular spray element on the desired target, which may include continuing to capture and analyze images as the tubular spray element is adjusted.

While image-based position sensing may be used in some embodiments to detect a current position of a tubular spray element in all orientations, in other embodiments it may be desirable to use image-based position sensing to detect only a subset of possible rotational positions, e.g., as little as a single “home” position. Likewise, as noted above, cam-based position sensing generally is used to detect only a subset of possible rotational positions of a tubular spray element. In such instances, it may therefore be desirable to utilize a time-based control where, given a known rate of rotation for a tubular spray element, a tubular spray element drive may drive a tubular spray element to different rotational positions by operating the tubular spray element drive for a predetermined amount of time associated with those positions (e.g., with a rate of 20 degrees of rotation per second, rotation from a home position at 0 degrees to a position 60 degrees offset from the home position would require activation of the drive for 3 seconds). Given a rotation rate of a tubular spray element drive (e.g., in terms of Y degrees per second) and a desired rotational displacement X from a known rotational position sensed by a position sensor, the time T to drive the tubular spray element drive after sensing a known rotational position is generally T=X/Y.

In order to determine the rotation rate of a tubular spray element, a calibration process, e.g., as illustrated at 340 in FIG. 15, may be used. It will be appreciated that calibration may be performed during idle times or during various points in a wash cycle, and may be performed in some instances while fluid is being expelled by a tubular spray element, or in other instances while no flow of fluid is provided to the tubular spray element. In addition, in some embodiments, different tubular spray elements may be calibrated at different times, while in other embodiments calibration may be performed concurrently for multiple tubular spray elements. It will also be appreciated that, in some instances, wear over time may cause variances in the rate of rotation of a tubular spray element in response to a given control input to a tubular spray element drive, and as such, it may be desirable to periodically perform process 340 over the life of a dishwasher to update the rotation rate associated with a tubular spray element.

In process 340, a tubular spray element is driven to a first position (e.g., a home position as sensed by an image-based position sensor or corresponding to a particular cam detector/cam lobe combination of a cam-based position sensor) in block 342, and then is driven to a second position in block 344, with the time to reach the second position determined, e.g., based upon a timer started when movement to the second position is initiated. The second position may be at a known rotational position relative to the first position, such that the actual rotational offset between the two positions may be used to derive a rate by dividing the rotational offset by the time to rotate from the first to the second position. The rate may then be updated in block 346 for use in subsequent time-based rotation control.

In some embodiments, the first and second positions may be separated by a portion of a revolution, while in some embodiments, the first and second positions may both be the same rotational position (e.g., a home position), such that the rotational offset corresponds to a full rotation of the tubular spray element. In addition, multiple iterations may be performed in some embodiments with the times to perform the various iterations averaged to generate the updated rate.

As an alternative to process 340, calibration of a tubular spray element may be based upon hitting a target, as illustrated by process 350 of FIG. 16. In this process, the tubular spray element is driven to a known first position, e.g., a home position, in block 352. Then, in block 354, the tubular spray element is driven while wash fluid is expelled by the tubular spray element until the spray pattern is detected hitting a particular target, e.g., similar to the manner discussed above in connection with FIG. 14. During this time, the amount of time required to rotate from the first position to the target position is tracked, and further based upon the known rotational offset of the target position from the first position, an updated rate parameter may be generated in block 356 for use in subsequent time-based rotation control.

FIG. 17 illustrates another example calibration process 360 suitable for use in some embodiments. Process 360, in addition to determining a rate of rotation, also may be used to assess a spray pattern of a tubular spray element and generate a flow rate parameter that may be used to control a variable valve that regulates flow through the tubular spray element, or alternatively control a flow rate for a fluid supply that supplies fluid to the tubular spray element. In particular, it will be appreciated that since solids build up over time with wash cycles (e.g., due to hard water and soils), it may be desirable to include a calibration mode where a dishwasher runs through a series of operations while visually detecting the rotational positions of the tubular spray elements. This collected information can serve a purpose of determining any degradation of rotational speed and/or change in exit pressure of wash liquid from the tubular spray elements over time. The calibration may then be used to cause a modification in rotational speed and/or exit pressure of water (e.g., via changes in flow rate) from the tubular spray elements in order to optimize a wash cycle.

Process 360 begins in block 362 by moving the tubular spray element to a first position. Block 364 then drives the tubular spray element to a second position and determines the time to reach the second position. In addition, during this time images are captured of the spray pattern generated by the tubular spray element. Next, in block 366, blocks 362 and 364 are repeated multiple times, with different flow rates supplied to the tubular spray element such that the spray patterns generated thereby may be captured for analysis. Block 368 then determines a rate parameter in the manner described above (optionally averaging together the rates from the multiple sweeps).

In addition, block 368 may select a flow rate parameter that provides a desired spray pattern. In some embodiments, for example, the spray patterns generated by different flow rates may be captured in different images collected during different sweeps, and the spray patterns may be compared against a desired spray pattern, with the spray pattern most closely matching the desired spray pattern being used to select the flow rate that generated the most closely matching spray pattern selected as the flow rate to be used. In addition, analysis of spray patterns may also be used to control rate of rotation, as it may be desirable in some embodiments to rotate tubular spray elements at slower speeds to increase the volume of fluid directed onto utensils and thereby compensate for reduced fluid flow. Further, in some embodiments, pressure strength may be measured through captured images. As one example, a tubular spray element may be rotated to an upwardly-facing direction and the height of the spray pattern generated may be sensed via captured images and used to determine a relative pressure strength of the tubular spray element.

In addition, as illustrated in block 370, it may be desired in some embodiments to optionally recommend maintenance or service based upon the detected spray patterns. For example, if no desirable spray patterns are detected, e.g., due to some nozzles being partially or fully blocked, it may be desirable to notify a customer of the condition, enabling the customer to either clean the nozzles, run a cleaning cycle with an appropriate cleaning solution to clean the nozzles, or schedule a service. The notification may be on a display of the dishwasher, on an app on the user's mobile device, via text or email, or in other suitable manners.

Now turning to FIG. 18, it may also be desirable in some embodiments to utilize position sensing to clear potential blockages in a tubular spray element. In a process 380, for example, a difference between sensed and expected rotational positions of a tubular spray element (or potentially of another type of controlled sprayer) may be detected in block 382, and may cause one or more tubular spray elements or other controlled sprayers to be focused on the blocked sprayers to attempt to clear the blockage. For example, if the gears or other drivetrain components for a controlled sprayer become blocked by food particles, other sprayers may be focused on the sprayer to attempt to clear the blockage.

After focusing spray on the blocked sprayer, block 386 may then attempt to return the blocked sprayer to a known position, and then monitor the position in any of the manners described above. Then, in block 388, if the movement is successful, the wash cycle may resume in a normal manner, and if not, an error may be signaled to the user, e.g., in any various manners mentioned above, for maintenance or service.

Detergent Sensing

In some embodiments of the invention, it may also be desirable to utilize an imaging system and/or tubular spray elements or other controllably-movable sprayers to perform detergent-related operations during a wash cycle, e.g., utilizing image-based detergent sensing. Any of the aforementioned controllably-movable sprayer designs, imaging system designs, and position detection designs may be used in the various detergent sensing embodiments discussed hereinafter.

In some embodiments, image-based detergent sensing may be used to sense a detergent type for the detergent from one or more captured images of the detergent. In some embodiments, the detergent type may include one or both of a class and a product. A detergent class may be considered to represent one of a number of different types or form factors of detergents including, but not limited to an amount of a bulk liquid, fluid or gel (hereinafter referred to as a “liquid detergent”), an amount of a powder (hereinafter referred to as a “powder detergent”), a single-use packet containing one or more liquid compositions, typically in a dissolvable film or cellulose container (hereinafter referred to as a “detergent packet”), and a single-use solid body (hereinafter referred to as a “detergent tablet”). In each such class, the chemical compositions generally dissolve in water to form a wash liquid or liquor, and it will be appreciated the chemical compositions may include soap, detergent, rinse-aid, chelating agents, and practically any other chemical composition that may be used in a dishwasher, either for washing or treating dishes or for cleaning or treating the dishwasher itself. The term “detergent”, in particular, should not be considered to be limited to chemical compositions exclusively used to wash utensils in a dishwasher, and may also include other chemical compositions that may be introduced into a dishwasher for the purposes of treating utensils in the dishwasher or the dishwasher itself.

A detergent product may be considered to represent a particular formulation of a detergent, including, for example, a product number, a brand, a SKU, etc. As will become more apparent below, detergent products may be characterized in some embodiments and maintained in a database such that performance characteristics of a particular detergent may be determined whenever the detergent product is identified and used to optimize a wash cycle. Among other possibilities, the carryover characteristics of different detergent products may be determined and stored in a database to enable a dishwasher to select a duration and/or number of wash or rinse operations performed in a wash cycle. Carryover generally refers to the inclination of a particular detergent to remain in a wash tub after a wash fluid containing that detergent is drained from the dishwasher. Some compositions, for example, may have a greater adherence to utensils, walls, and other bodies in a wash tub, such that it may be desirable to drain wash liquid from a wash tub during a relatively-shorter wash or rinse operation and repeat the wash or rinse operation after refilling with clean water for detergents associated with higher carryover, while conserving water and performing a relatively-longer wash or rinse operation with no refill for detergents associated with lower carryover.

Other performance characteristics of a particular product may also be considered when optimizing a wash cycle, e.g., whether a detergent is enzyme or bleach-based, the life of the enzyme, effective wash temperature, the presence of multiple components (e.g., where detergent packets having multiple compartments that release components at different temperatures and/or times), rinseability, etc. In addition, a wash cycle may be optimized for different detergent products by varying one or more of a water temperature (wash and/or rinse), a fill volume, an operation length (e.g., a wash, presoak or rinse operation), a number of operations (e.g., whether to repeat a wash or rinse operation one or more times), a detergent amount (e.g., as dispensed by an automatic dispenser in the dishwasher), number of water changes (e.g., drains and fills), etc.

Image-based detergent sensing may also be used in some embodiments to determine physical characteristics of a detergent, e.g., a location and/or a size. A location of a detergent may be considered to represent the physical location of the detergent, and may in some instances refer to a general location, e.g., in a dispenser, in a receptacle, in a rack, in a basket, on a wall or on a surface in the sump, or may in some instances refer to a specific physical location in the dishwasher, e.g., laying in the sump 2.5 inches from the door and 12.4 inches from the left wall. Size may refer to a general size, e.g., small, medium or large, or may refer to specific dimensions. In some embodiments, for example, a bounding box may be generated to represent the size and location of a detergent in a dishwasher within the field of view of a particular imaging device.

In this regard, image-based detergent sensing in some embodiments may be used to direct one or more controllably-movable sprayers (e.g., one or more tubular spray elements) in a dishwasher at detergent within a dishwasher to accelerate dissolution or mixing of a detergent into water or another liquid, or in some instances, to clean the dishwasher itself.

Now turning to FIG. 19, this figure illustrates a dishwasher 400 including a wash tub 402 and upper and lower racks 404, 406 for holding one or more utensils 408. In this embodiment, arrays of wall-mounted tubular spray elements 410, 412 are disposed below each of racks 404, 406, with tubular spray elements 410 mounted to a rear wall of wash tub 402 and tubular spray elements 412 mounted to a side wall of wash tub 402 such that tubular spray elements 412 extend generally transversely to tubular spray elements 410. In other embodiments, tubular spray elements 410 and/or 412 may be rack-mounted, and in other embodiments other positions, numbers, and arrangements of tubular spray elements may be used. Further, in other embodiments, other sprayers may be used in addition to or in lieu of tubular spray elements, so the invention is not limited to detergent sensing in connection with tubular spray elements.

Dishwasher 400 also includes a door 414 that provides external access to the wash tub. In addition, a detergent dispenser 416 is mounted on door 414, and includes a hinged and spring-loaded door 418 that may be closed by a user after detergent has been placed in the dispenser prior to a wash cycle and then automatically released during a wash cycle to release the detergent into the wash tub. It will be appreciated that dispenser 416 may be disposed elsewhere in a dishwasher in other embodiments, e.g., on a tub wall, in a rack, in a receptacle in a rack. Further, in some embodiments, no dispenser may be provided, and a user may simply introduce detergent into the wash tub.

Dishwasher 400 also includes an imaging system including one or more imaging devices, e.g., imaging devices 420 mounted in fixed locations and with fixed fields of view on the rear wall of wash tub 402 and door 420, and capable of functioning as a detergent sensor. In addition, as noted above, rather than utilizing a fixed imaging device, in other embodiments an imaging device having a controllably-variable field of view may be used, e.g., as illustrated by imaging device 422 disposed on tubular spray element 412a. When detergent sensing is desired, imaging device 422 may be moved to a position where the field of view thereof includes the detergent; however, at other times imaging device 422 may be moved to other positions to capture images for other purposes. Additional illumination sources (not shown in FIG. 19) may also be utilized to provide illumination for the various images captured by imaging devices 420, 422.

As will become more apparent below, a dishwasher 400 consistent with some embodiments of the invention may be utilized to (1) determine detergent class, (2) determine a detergent product, (3) determine a detergent location and size, (4) optimize a wash cycle based upon the detergent product, and (4) direct a spray of fluid from one or more controllably-movable sprayers to accelerate dissolution of the detergent during the wash cycle. FIG. 19, in particular, illustrates a detergent tablet 424 that has been dropped from the position indicated at 424′ within dispenser 416 upon release of lid 418, and that has come to rest on the floor of the wash tub, e.g., within a sump 426. In some embodiments of the invention, one or more of imaging devices 420, 422 may be used to determine that the detergent is a tablet, that the detergent is a particular product that has high carryover, and that the detergent is located at a specific location in the sump. Based upon this information, the controller of the dishwasher may determine that two shorter wash cycles with a drain and refill with clean water should be performed to address the high carryover of the detergent. In addition, the controller of the dishwasher may, upon locating the detergent, direct a spray of fluid from tubular spray element 412a (and optionally, other controllably-movable sprayers) to accelerate the dissolution of the detergent into the wash fluid, optionally with image analysis performed on a periodic basis to determine when the detergent tablet is fully dissolved.

FIG. 20 also illustrates dishwasher 400, but where the dispenser 416 has been loaded with a liquid or powder detergent 428, which has poured out of the dispenser upon release of lid 418. In some embodiments of the invention, one or more of imaging devices 420, 422 may be used to determine that the detergent is a liquid or powder, that the detergent is a particular product that has low carryover, and that the detergent is located in and below the dispenser itself. Based upon this information, the controller of the dishwasher may determine that a single longer wash cycle should be performed due to the low carryover of the detergent. In addition, the controller of the dishwasher may, upon locating the detergent, direct a spray of fluid from tubular spray element 412a (and optionally, other controllably-movable sprayers) to accelerate the dissolution of the detergent into the wash fluid, optionally with image analysis performed on a periodic basis to determine when no residue is left in the dispenser and on the areas of the door surrounding the dispenser.

FIG. 21 illustrates another variation, whereby a dishwasher 430 includes a dispenser 432 having a hinged lid 434, and having mounted below a basket or other receptacle 436 capable of catching the detergent when lid 434 is released, e.g., as illustrated by detergent packet 438, which has dropped into receptacle 432 from the position illustrated at 438′ upon release of lid 434. It may be desirable in some embodiments to incorporate such a receptacle 436 into a door, a wall of a wash tub, or a rack, for example, to temporarily hold the detergent in a predetermined location to facilitate one or more of detergent identification, detergent location, and detergent dissolution.

Image-based detergent sensing consistent with the invention may be performed locally in a dishwasher in some embodiments, while in other embodiments, image-based detergent sensing may utilize a remote device, e.g., a cloud service, to perform at least portions of the image analysis utilized in such sensing. FIG. 22, for example, illustrates a distributed system 450 whereby a dishwasher is in communication with a cloud service 454 over one or more networks 456, utilizing networking functionality 458, 460 in each of dishwasher 452 and cloud service 454 to handle communications therebetween, e.g., through the issuance of request and response packets communicated over the network.

Dishwasher 452 also includes a local image analysis module 462 configured to analyze images captured by the imaging system, as well as a detergent database 464 that stores performance characterization information for a plurality of commercially-available detergent products. The performance characterization information may be determined empirically via testing in some instances, and may include any of the various types of information discussed above, including carryover information. In addition, the detergent database 464 may also include visual information associated with each product in the database, e.g., shape, size, color, pattern and/or other information that may be used to uniquely identify a particular detergent product.

In addition, while image analysis may be performed in various manners as will be appreciated by those of ordinary skill having the benefit of the instant disclosure, in some embodiments image analysis may be performed using one or more trained machine learning models 466 that may perform various functions such as identifying a location of detergent in a dishwasher, identifying a size of detergent in a dishwasher, identifying a shape of detergent in a dishwasher, or identifying a class or product of detergent in a dishwasher, among others. It will be appreciated implementation and training of such models to perform the various functions described herein would be well within the abilities of those of ordinary skill having the benefit of the instant disclosure.

As noted above, in some instances detergent sensing consistent with the invention may be performed entirely locally within a dishwasher, including a dishwasher lacking any external connectivity. In other embodiments, however, some or all of the functionality described herein may be implemented in a remote device such as cloud service 454. Accordingly, FIG. 22 illustrates cloud service 454 including a complementary image analysis module 458, detergent database 470, and trained machine learning model(s) 472. It will be appreciated that the complementary components may be duplicated in both dishwasher 452 and cloud service 454 in some embodiments, while in other embodiments some of components 462-470 may be omitted, or some of components 462-466 may be scaled down, or less processor and/or memory-intensive than complementary components 468-472 to reflect the relative difference in computing resources between dishwasher 452 and cloud service 454. Some of the image analysis functionality, for example, may be performed locally while other image analysis functionality may be performed remotely in some embodiments. As but one example, analysis of images to determine detergent size and/or location may be performed locally in some embodiments while analysis of images to determine detergent class and/or product may be performed remotely.

Now turning to FIG. 23, this figure illustrates a process 500 for detecting detergent consistent with some embodiments of the invention, which may be performed locally in a dishwasher in some embodiments, or at least in part performed remotely by a remote device such as a cloud service. Process 500 may be performed at various points in time, including prior to a wash cycle or during a wash cycle, based in part upon when the detergent is visible in the wash tub.

Process 500 begins in block 502 by capturing one or more images of the wash tub with one or more imaging devices and performing image analysis to locate the detergent. In connection with this step, block 502 may also control one or more imaging devices controllably-vary the field of view of those devices and capture different regions of the dishwasher. In some embodiments, all likely regions of a dishwasher may be analyzed, while in other embodiments one or more predetermined locations may be reviewed sequentially, e.g., first analyzing the dispenser, then a receptacle (if included in the dishwasher), and finally a sump or other area of the dishwasher where detergent may be expected to be located. At this time, a bounding box may also be created for the detergent, e.g., to define the location and size of the detergent within the field of view of a particular imaging device. FIG. 21, for example, illustrates an example bounding box 440 that may be created for detergent 438 based upon an image capture thereof.

Returning to FIG. 23, if the location is not found, a notification may optionally be generated to notify a user that no detergent was found. Otherwise, block 504 may optionally capture one or more additional images of the detergent given the known location, such that additional image analysis may be performed to identify a class and/or product for the detergent. In some embodiments, the images captured in block 502 may instead be used to identify the class and/or product of the detergent, while in some embodiments, block 504 may be omitted entirely, with no class or product determination made.

Next, block 506 optimizes a wash cycle based on the identified detergent, e.g., based on one or more of a location, size, class or product identified for the detergent. FIG. 23 illustrates a number of such optimizations that may be performed, and it will be appreciated that individual optimizations, or various combinations of optimizations, may be performed in different embodiments.

For example, as illustrated by block 508, in some embodiments one or more wash cycle parameters may be configured based upon the identified detergent, e.g., as discussed above. In addition, block 510 illustrates one specific wash cycle configuration, the selection of an operation duration and/or number based upon the carryover of the identified detergent. For detergents with high carryover, for example, it may be desirable to utilize two relatively-shorter wash or rinse operations with a drain and refill between, while for detergents with low carryover, it may be desirable to use a single relatively-longer wash or rinse operation.

Blocks 512, 514 and 516 illustrate three other optimizations that may be performed in some embodiments. Block 512 for example illustrates a dispenser spray out operation that may be initiated, for example, in response to determining that the detergent is in the dispenser, e.g., if the detergent is a liquid or powder detergent. Block 514 illustrates a receptacle spray out operation that may be initiated, for example, in response to determining that the detergent is in the receptacle. Block 516 illustrates a detergent dissolution operation that may be performed, for example, in response to determining that the detergent is a tablet or packet that has been dropped into the sump or some other region of the dishwasher.

Other types of optimizations may be performed in other embodiments, as will be appreciated those of ordinary skill having the benefit of the instant disclosure. Therefore, the invention is not limited to the combination of optimizations disclosed herein. In addition, a dishwasher consistent with the invention may support only a subset of the aforementioned optimizations in some embodiments.

Now turning to FIG. 24, this figure illustrates a process 520 for performing a spray out operation, e.g., corresponding to a dispenser or receptacle spray out operation 512, 514 of FIG. 23. Process 520 may also be performed at the end of a wash cycle in some embodiments or at other times, e.g., as part of a self-clean operation.

Process 520 begins in block 522 by optionally capturing one or more images of the dispenser/receptacle and performing image analysis to determine the specific location and bounding box of the detergent. In some embodiments, however, block 522 may be omitted, and it may be assumed that the spray out operation will direct fluid at the dispenser or receptacle, regardless of the specific location of the detergent itself.

Next, block 524 moves one or more controllably-movable sprayers (e.g., one or more tubular spray elements) to direct fluid at the detergent, either with a static spray, or optionally with a sweeping spray that covers the bounding box defining the extents of the detergent. In some embodiments, these sprayers may be dedicated to detergent spraying; however, in other embodiments, these sprayers may be used for other purposes when not spraying detergent, e.g., to wash utensils in the dishwasher.

In some embodiments, the spray may be set for a predetermined time, after which the spray is discontinued. In other embodiments, however, it may be desirable to visually detect when the dispenser or receptacle has been cleaned of detergent. In such embodiments, control passes to block 526 to capture one or more new images of the dispenser or receptacle and perform image analysis to determine if any residual detergent remains. In some embodiments, the spray of fluid may be temporarily paused during the image capture such that the spray of fluid does not occlude the dispenser or receptacle.

If residual detergent is still detected, block 528 returns control to block 524 to continue to direct spray onto the detergent. In some embodiments, the image analysis of block 526 may also detect a movement or decrease in bounding box size for the detergent, so block 524 may also vary the direction and/or sweep of the spray based upon the updated images in some embodiments.

If no residual detergent is still detected, however, dissolution of the detergent is complete, and block 528 passes control to block 530 to discontinue the spray from the controllably-movable sprayer(s). Process 520 is then complete.

Now turning to FIG. 25, this figure illustrates a process 540 for performing a detergent dissolution operation, e.g., corresponding to the dispenser dissolution operation 516 of FIG. 23. Process 540 may also be performed at the end of a wash cycle in some embodiments or at other times, e.g., as part of a self-clean operation.

Process 540 begins in block 542 by capturing one or more images of the wash tub and performing image analysis to determine the specific location and bounding box of the detergent. In some embodiments, one or more imaging devices with controllably-variable fields of view may be controlled during block 542 to inspect different regions of the dishwasher and locate the detergent.

Next, block 544 moves one or more controllably-movable sprayers (e.g., one or more tubular spray elements) to direct fluid at the detergent, either with a static spray, or optionally with a sweeping spray that covers the bounding box defining the extents of the detergent. In some embodiments, these sprayers may be dedicated to detergent spraying; however, in other embodiments, these sprayers may be used for other purposes when not spraying detergent, e.g., to wash utensils in the dishwasher.

In some embodiments, the spray may be set for a predetermined time, after which the spray is discontinued. In other embodiments, however, it may be desirable to visually detect when the detergent has been fully dissolved. In such embodiments, control passes to block 546 to capture one or more new images of the detergent and perform image analysis to determine if any residual detergent remains, as well as to determine if the detergent has changed in size or location. In some embodiments, the spray of fluid may be temporarily paused during the image capture such that the spray of fluid does not occlude the detergent.

If the detergent has moved or changed in size, block 548 passes control to block 550 to update the bounding box used to control the direction and sweep of the controllably-movable sprayer(s), thereby effectively changing the direction of the controllably-movable sprayer(s) based on the change in location and/or size of the detergent. It will be appreciated that the force of the spray of fluid onto the detergent may, in some instances, cause the detergent to be dislodged from its original location, so by updating the bounding box, the sprayer(s) may effectively follow the detergent until the detergent is completely dissolved. In some embodiments, in fact, it may be desirable to direct a spray of fluid near, but not directly on, the detergent to reduce the movement of the detergent during the operation.

If the detergent has not moved or changed in size, block 548 bypasses block 550. Regardless, control next passes to block 552 to determine if residual detergent is still detected. If so, block 552 returns control to block 544 to continue to direct spray onto the detergent. If no residual detergent is still detected, however, dissolution of the detergent is complete, and block 552 passes control to block 554 to discontinue the spray from the controllably-movable sprayer(s). Process 540 is then complete.

Conclusion

It will be appreciated that the analysis of images captured by an imaging device, and the determination of various conditions reflected by the captured images, may be performed locally within a controller of a dishwasher in some embodiments. In other embodiments, however, image analysis and/or detection of conditions based thereon may be performed remotely in a remote device such as a cloud-based service, a mobile device, etc. In such instances, image data may be communicated by the controller of a dishwasher over a public or private network such as the Internet to a remote device for processing thereby, and the remote device may return a response to the dishwasher controller with result data, e.g., an identification of certain features detected in an image, an identification of a condition in the dishwasher, an value representative of a sensed condition in the dishwasher, a command to perform a particular action in the dishwasher, or other result data suitable for a particular scenario. Therefore, while the embodiments discussed above have predominantly focused on operations performed locally within a dishwasher, the invention is not so limited, and some or all of the functionality described herein may be performed externally from a dishwasher consistent with the invention.

Various additional modifications may be made to the illustrated embodiments consistent with the invention. Therefore, the invention lies in the claims hereinafter appended.

	Number	Date	Country
Parent	16588310	Sep 2019	US
Child	18045609		US

DISHWASHER WITH IMAGE-BASED DETERGENT SENSING

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