Patent Application
20120074123
The present disclosure generally relates to appliances, and more particularly to a control system of a double oven cooking appliance.
Cooking appliances that feature two self-cleaning ovens generally utilize an electronic range control (ERC) to operate and regulate each of the oven cavities. Generally, a single electronic range control is used to control each oven cavity. Electronic range control devices with this capability tend to be expensive due to the added costs of the required electronic components, including for example, the relays and sensor inputs. Additionally, electronic range control devices tend to incorporate feature and option sets typically found on higher end oven models. Thus, for lower end oven appliances equipped with two self-cleaning ovens, it does not tend to be cost effective to utilize electronic range control devices to control and regulate the temperature of both ovens.
Accordingly, it would be desirable to provide a system that addresses at least some of the problems identified above.
As described herein, the exemplary embodiments overcome one or more of the above or other disadvantages known in the art.
One aspect of the exemplary embodiments relates to a control system for an appliance that includes at least a first oven and a second oven. In one embodiment, an electronic range control device regulates a temperature of the first oven and an electromechanical thermostat assembly regulates a temperature of the second oven. A relay circuit assembly under control of the electronic range control device selectively enables operation of the first oven and the electromechanical thermostat.
Another aspect of the disclosed embodiments relates to a method in a double oven appliance that includes regulating a state of a first oven using an electronic range control, regulating a state of a second oven using an electromechanical thermostat assembly, monitoring a state of the electromechanical thermostat assembly using the electronic range control to determine the state of the second oven, and selectively enabling one or both of the first oven and the second oven when the other of the first oven or the second oven is in a pre-determined state.
These and other aspects and advantages of the exemplary embodiments will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims. Moreover, the drawings are not necessarily drawn to scale and unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein. In addition, any suitable size, shape or type of elements or materials could be used.
In the drawings:
Referring to
As is shown in
The cabinet 101 of the oven 100 also includes control surface 108 that supports control knobs 115-118 or other suitable control switches for regulating the surface heating units 107. The cabinet 101 also includes a control panel 130 that includes a central control and display unit, also referred to as a user interface. One aspect of the control panel 130 is to control the operation of one or both of the first and second ovens 110, 120, including the modes of operation and temperature settings. The control panel 130 can include one or more controls or switches 131 that can be used to provide control inputs and commands for one or more of the functions of the oven 100. In one embodiment, the controls 131 can be in the form of push buttons, electronic switches, capacitive touch devices, pressure sensitive touch screens or near touch devices.
In one embodiment, the oven 100 includes a controller 140. The controller 140 is coupled to the control panel 130 and configured to receive inputs and commands from for example, the controls 115-118 and 131, and control the various operations and functions of the oven 100 as further described herein. In alternate embodiments, any suitable multiple oven configuration can be used.
The ERC relay circuit 204, which is under the control of the electronic range control 206, is configured to regulate the supply of electrical power to the first oven 110. The electronic range control 206 thus directly regulates the temperature of the first oven 110. The thermostat relay circuit 208, which is under the control of the electronic range control 206, regulates the supply of electrical power to the electromechanical thermostat assembly 210. The electromechanical thermostat assembly 210 directly regulates the temperature of the second oven 120.
As is shown in
In one embodiment, the electronic range control 206 monitors the state or mode of the electromechanical thermostat assembly 210. Generally, the states or mode of the electromechanical thermostat assembly 210 include an OFF state, a cooking state or mode and a cleaning state or mode. In one embodiment, the cooking state includes a bake or broil mode. The cleaning state includes a self-clean mode as is generally understood in the art. The electronic range control 206 will selectively enable one or both of the ERC relay circuit 204 or the thermostat control relay 208 depending on the particular state of the electromechanical thermostat assembly 210. For example, when a self-clean operation is programmed or initiated for the first oven 110, the electronic range control 206 prevents the electromechanical thermostat assembly 210 from entering certain modes of operation by disabling the thermostat relay circuit 208. For example, engaging one of the cooking modes of the electromechanical thermostat 210 is prevented when the first oven 110 or the second oven 120 is in a self clean operation. When the electromechanical thermostat assembly 210 is in a cooking mode, the electronic range control 206 will prevent the initiation of a self clean operation in the first oven 110 as well as the second oven 120. By monitoring the state of the electromechanical thermostat assembly 210, the electronic range control 206 can enable independent operation of either oven 110, 120 in cooking modes, and dependent operation of both ovens 110, 120 during self clean modes.
As shown in
The thermostat sensor or switch 304 is used to monitor a temperature of the second oven 120. In one embodiment, as is shown in
In this example, the state of thermostat OFF switch 301 and the thermostat clean position switch 302 are monitored by a processor 401 in the electronic range control 206. The processor 401 is configured to control an ERC mode select relay 402, self clean interlock relay 408, as well as first oven heater relays 431 and 432. In this example, the ERC mode select relay 402 and the self-clean interlock relay 408 generally comprise the thermostat relay circuit 208 of
When neither the thermostat OFF switch 301 or the thermostat clean position switch 302 is selected or closed, the electronic range control 206 generally enables the ERC relay circuit 204 and the thermostat relay circuit 208 for cooking operations of each of the ovens 110, 112. As shown in
As shown in
In one embodiment, when the state of the thermostat OFF switch 301 is selected or closed, the electronic range control 206, via the processor 401 in this example, is generally configured to place the ERC mode select relay 402 in the Bake Broil state or position 402, and the Self Clean Interlock 408 in the open state or position. In this manner, the electronic range control 206 can allow cooking or self clean operations to take place in the first oven 110 by monitoring the state of the thermostat OFF switch 301.
When the clean thermostat clean position switch 302 is selected, as generally indicated by the closed position of switch 302 in this example, and the electronic range control 206 determines that the requested self clean operation is permitted, the ERC Mode select relay 402 is configured to switch to the Self Clean position 406. The closure of thermostat clean position switch 302 is generally interpreted by the electronic range control 206 as a command for the second oven 120 to initiate a self-clean operation. In one embodiment, the initiation of a self-clean operation can also include the setting of a clean time and a confirmation, through for example, the control panel 130 of
In one embodiment, when the self-clean operation command is confirmed by the electronic range control 206, the self-clean interlock switch 408 is closed to provide a circuit connection to one of the heaters 421, 422. In this example, the closure of the self-clean interlock switch 408 provides a circuit connection to oven heater 421 of the second oven 120. A self-clean operation with the thermostat assembly 210 of the disclosed embodiments utilizes only one of the second oven heaters 421, 422.
In one embodiment, the electronic range control 206 monitors the clean time and provides a visual display on the control panel 130. When the time for the self-clean operation expires, the electronic range control 206 changes a state of the self-clean interlock switch 408 to the open, or disconnected position, thus interrupting the circuit connection to the heater 421. As will be generally understood, a programmed cool down takes place, until the temperature of the oven 120, as well as oven 110, is within predetermined limits to allow operation of the ovens 110 and 120 to resume. In one embodiment, during the programmed cool down, the ERC mode select relay 402 remains in the Self Clean position 406, which prevents the thermostat assembly 210 from enabling any other mode. At the end of the programmed cool down, the ERC mode select relay 402 switches back to the Bake/Broil position 404, thus re-enabling the selection of a cooking mode of operation of the oven 120.
When the clean mode is not selected, as indicated by the open state of thermostat clean position switch 302, the electronic range control 206 is configured to enable the selection of one of the cooking modes of the electromechanical thermostat assembly 210. As shown in
When the first oven 110 is in a self clean operation, the electronic range control 206 will switch the ERC mode select relay 402 to the self clean position 406. This prevents a cooking mode of the thermostat assembly 210 from being engaged while the first oven 110 is in the self clean operation. The electronic range control 206 can also monitor the state of switches 301-303 to determine whether the first oven 110 can be enabled for a self-clean operation. If the second oven 120 is in a cooking mode, the first oven 110 will not be enabled for a self-clean operation until the thermostat OFF switch 301 is enabled or the thermostat mode select switch 303 is in the neutral position 307.
The thermostat clean position switch 302 is this embodiment is a SPDT switch that is configured to create a circuit connection between the AC power 202 and one of the Bake/Broil switch position 504 or the Self-Clean switch position 506. When the thermostat clean position switch 302 is in the Bake/Broil position 504 and the ERC mode select relay 402 is switched to the Bake/Broil position 404 and a circuit connection is established between the AC Power Source 202 and the thermostat sensor 304.
The disclosed embodiments may also include software and computer programs incorporating the process steps and instructions described above. In one embodiment, the programs incorporating the process described herein can be stored on or in a computer program product and executed in one or more computers. The controller 140 illustrated in
The controller 140 may be linked to another computer system or controller (not shown), such that the controllers are capable of sending information to each other and receiving information from each other. In one embodiment, the controller 140 could include a server computer or controller adapted to communicate with a network, such as for example, a wireless network or the Internet.
The controller 140 is generally adapted to utilize program storage devices embodying machine-readable program source code, which is adapted to cause the controller 140 to perform the method steps and processes disclosed herein. The program storage devices incorporating aspects of the disclosed embodiments may be devised, made and used as a component of a machine utilizing optics, magnetic properties and/or electronics to perform the procedures and methods disclosed herein. In alternate embodiments, the program storage devices may include magnetic media, such as a diskette, disk, memory stick or computer hard drive, which is readable and executable by a computer. In other alternate embodiments, the program storage devices could include optical disks, read-only-memory (“ROM”) floppy disks and semiconductor materials and chips.
The controller 140 may also include one or more processors, such as processor 401, for executing stored programs, and may include a data storage or memory device on its program storage device for the storage of information and data. The computer program or software incorporating the processes and method steps incorporating aspects of the disclosed embodiments may be stored in one or more computer systems or on an otherwise conventional program storage device.
The aspects of the disclosed embodiments provide a low cost control solution for a cooking appliance equipped with two self-cleaning ovens by using an electronic range control for regulating the temperature of the first oven and an electromechanical thermostat assembly for regulating the temperature of the second oven. Interlock circuitry under control of the electronic range control can prevent operation of the electromechanical thermostat assembly in certain modes of operation.
Thus, while there have been shown, described and pointed out, fundamental novel features of the invention as applied to the exemplary embodiments thereof, it will be understood that various omissions and substitutions and changes in the form and details of devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. Moreover, it is expressly intended that all combinations of those elements and/or method steps, which perform substantially the same function in substantially the same way to achieve the same results, are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.
