The present disclosure generally relates to methods and systems for propelling marine vessels, and more particularly to systems and methods for providing lateral and rotational propulsion.
Many different types of marine drives are well known to those skilled in the art. For example, steerable marine drives mounted to the rear of the vessel, such as outboard motors that are attached to the transom of a marine vessel and stern drive systems that extend in a rearward direction from the stern of a marine vessel, may sometimes be provided in groups of two or more and separately steerable to enable surge, sway, and yaw directional control, sometimes referred to as joysticking. The steerable marine drives are each steerable about their steering axis to a range of steering angles, which is effectuated by a steering actuator. Lateral marine drives may be positioned to exert lateral force on the marine vessel, such as bow thrusters. Marine drives generally comprise a powerhead, such as an electric motor or an internal combustion engine, driving rotation of a drive shaft that is directly or indirectly connected to a propeller on a propeller shaft and that imparts rotation thereto.
The following U.S. Patents are incorporated herein by reference, in entirety:
U.S. Pat. No. 6,234,853 discloses a docking system that utilizes the marine propulsion unit of a marine vessel, under the control of an engine control unit that receives command signals from a joystick or push button device, to respond to a maneuver command from the marine operator. The docking system does not require additional marine drives other than those normally used to operate the marine vessel under normal conditions. The docking or maneuvering system of the present invention uses two marine propulsion units to respond to an operator's command signal and allows the operator to select forward or reverse commands in combination with clockwise or counterclockwise rotational commands either in combination with each other or alone.
U.S. Pat. No. 6,402,577 discloses a hydraulic steering system in which a steering actuator is an integral portion of the support structure of a marine propulsion system. A steering arm is contained completely within the support structure of the marine propulsion system and disposed about its steering axis. An extension of the steering arm extends into a sliding joint which has a linear component and a rotational component which allows the extension of the steering arm to move relative to a moveable second portion of the steering actuator. The moveable second portion of the steering actuator moves linearly within a cylinder cavity formed in a first portion of the steering actuator.
U.S. Pat. No. 7,398,742 discloses a steering assist system providing differential thrusts by two or more marine drives in order to create a more effective turning moment on a marine vessel. The differential thrusts can be selected as a function of the magnitude of turn commanded by an operator of the marine vessel and, in addition, as a function of the speed of the marine vessel at the time when the turning command is received.
U.S. Pat. No. 7,467,595 discloses a method for controlling the movement of a marine vessel that rotates one of a pair of marine drives and controls the thrust magnitudes of two marine drives. A joystick is provided to allow the operator of the marine vessel to select port-starboard, forward-reverse, and rotational direction commands that are interpreted by a controller which then changes the angular position of at least one of a pair of marine drives relative to its steering axis.
U.S. Pat. No. 9,039,468 discloses a system that controls speed of a marine vessel that includes first and second marine drives that produce first and second thrusts to propel the marine vessel. A control circuit controls orientation of the marine drives between an aligned position in which the thrusts are parallel and an unaligned position in which the thrusts are non-parallel. A first user input device is moveable between a neutral position and a non-neutral detent position. When the first user input device is in the detent position and the marine drives are in the aligned position, the thrusts propel the marine vessel in a desired direction at a first speed. When a second user input device is actuated while the first user input device is in the detent position, the marine drives move into the unaligned position and propel the marine vessel in the desired direction at a second, decreased speed without altering the thrusts.
U.S. Pat. No. 10,926,855 discloses a method for controlling low-speed propulsion of a marine vessel powered by a marine propulsion system having a plurality of propulsion devices that includes receiving a signal indicating a position of a manually operable input device movable to indicate desired vessel movement within three degrees of freedom, and associating the position of the manually operable input device with a desired inertial velocity of the marine vessel. A steering position command and an engine command are then determined for each of the plurality of propulsion devices based on the desired inertial velocity and the propulsion system is controlled accordingly. An actual velocity of the marine vessel is measured and a difference between the desired inertial velocity and the actual velocity is determined, where the difference is used as feedback in subsequent steering position command and engine command determinations.
U.S. Pat. No. 11,091,243 discloses a propulsion system on a marine vessel that includes at least one steerable propulsion device and at least one lateral thruster. A steering wheel is mechanically connected to and operable by a user to steer the at least one propulsion device. A user interface device is operable by a user to provide at least a lateral thrust command to command lateral movement and a rotational thrust command to command rotational movement of the vessel. A controller is configured to determine a difference between a steering position of the propulsion device and a centered steering position. A user interface display is controllable to indicate at least one of the steering position of the propulsion device and the difference between the steering position and the centered steering position. The controller is further configured to determine that the steering position is within a threshold range of the centered steering position.
U.S. Publication No. 2021/0286362 discloses a marine propulsion system that includes at least two parallel propulsion devices that each generate forward and reverse thrusts, wherein the parallel propulsion devices are oriented such that their thrusts are parallel to one another, and at least one drive position sensor configured to sense a drive angle of the parallel propulsion devices. A lateral thruster is configured to generate starboard and port thrust to propel the marine vessel. A user input device is operable by a user to provide at least a lateral thrust command to command lateral movement of the marine vessel and a rotational thrust command to command rotational movement of the marine vessel. A controller is configured to control the parallel propulsion devices and the lateral thruster based on the lateral steering input and/or the rotational steering input and the drive angle so as to provide the lateral movement and/or the rotational movement commanded by the user without controlling the drive angle.
U.S. application Ser. No. 17/131,115 discloses a method of controlling an electric marine propulsion system configured to propel a marine vessel including measuring at least one parameter of an electric motor in the electric marine propulsion system and determining that the parameter measurement indicates an abnormality in the electric marine propulsion system. A reduced operation limit is then determined based on the at least one parameter measurement, wherein the reduced operation limit includes at least one of a torque limit, an RPM limit, a current limit, and a power limit. The electric motor is then controlled such that the reduced operation limit is not exceeded.
U.S. application Ser. No. 17/185,289 discloses a stowable propulsion system for a marine vessel. A base is configured to be coupled to the marine vessel. A shaft has a proximal end and a distal end with a length axis defined therebetween, where the shaft is pivotably coupled to the base and pivotable about a transverse axis between a stowed position and a deployed position, and where the distal end is closer to the marine vessel when in the stowed position than in the deployed position. A gearset is engaged between the shaft and the base, where the gearset rotates the shaft about the length axis when the shaft is pivoted between the stowed position and the deployed position. A propulsion device is coupled to the distal end of the shaft. The propulsion device is configured to propel the marine vessel in water when the shaft is in the deployed position.
This Summary is provided to introduce a selection of concepts that are further described below in the Detailed Description. This Summary 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.
In one aspect of the present disclosure, a marine propulsion system for a marine vessel includes a lateral marine drive positioned at a bow region of the marine vessel, wherein the lateral marine drive is configured to generate lateral thrust on the marine vessel and a user input device operable by a user to provide a propulsion demand input to control the lateral marine drive. A control system is configured to determine a maximum allowable lateral output based on a speed characteristic and to control the lateral marine drive based on the propulsion demand input such that the lateral marine drive does not exceed the maximum allowable lateral output.
In one embodiment, the speed characteristic is a vessel speed of the marine vessel.
In another embodiment, the speed characteristic is a rotational speed of a second marine drive configured to propel the marine vessel.
In another embodiment, the maximum allowable lateral output is at least one of a rotational speed of the lateral marine drive, a current delivery to the lateral marine drive, a torque output of the lateral marine drive, or a demand percent for the lateral marine drive.
In another embodiment, the control system is configured to set the maximum allowable lateral output equal to a maximum capability of the lateral marine drive when the speed characteristic is less than a first speed threshold, and set the maximum allowable lateral output to less than the maximum capability of the lateral marine drive when the speed characteristic is greater than the first speed threshold.
In another embodiment, the control system is configured to progressively decrease the maximum allowable lateral output as the speed characteristic becomes progressively greater than a first speed threshold.
In another embodiment, the control system is configured to set the maximum allowable lateral output to zero when the speed characteristic exceeds a maximum speed threshold.
In another embodiment, the system further includes at least one rear marine drive on the marine vessel and configured to generate forward and reverse thrusts, and the control system is configured to control thrust of the rear marine drive based on the propulsion demand input, wherein only the lateral marine drive is controlled based on the maximum allowable lateral output.
Optionally, the control system is configured to progressively decrease the maximum allowable lateral output of the lateral marine drive as the speed characteristic increases to a maximum speed threshold such that only the at least one rear marine drive is operated based on the propulsion demand input when the speed characteristic is above the maximum speed threshold.
In another embodiment, the system comprises at least two rear marine drives on the marine vessel and configured to generate forward and reverse thrusts and controllable by the control system based on the propulsion demand input, and the speed characteristic is based on a propulsion output of at least one of the at least two rear marine drives.
In another embodiment, the system is configured to operate in at least a first mode where the user input device controls only the lateral marine drive and a second mode where the user input device controls both the lateral marine drive and the at least one rear marine drive.
In another embodiment, the system further includes a map stored in memory accessible by the control system, the map configured to correlate possible propulsion demand inputs from the user input device and speed characteristics to thrust commands for the lateral marine drive, and wherein the control system is configured to utilize the map to determine a thrust command for the lateral marine drive based on the propulsion demand input and a current speed characteristic.
In another embodiment, the control system further comprises a closed-loop yaw controller configured to determine a lateral thrust command based at least in part on a sensed yaw motion of the marine vessel, and the control system is configured to utilize the control model to determine a thrust command for the lateral marine drive.
In one aspect of the present disclosure, for a marine propulsion system including a lateral marine drive on a bow region of a marine vessel that is configured to generate lateral thrust on the marine vessel, a method of controlling marine propulsion includes receiving, from a user input device, a propulsion demand input commanding lateral thrust from the lateral marine drive and determining a maximum allowable lateral output based on a speed characteristic. A lateral thrust command for the lateral marine drive is determined based on the propulsion demand input and the maximum allowable lateral output. The lateral marine drive is then controlled based on the lateral thrust command such that the lateral marine drive does not exceed the maximum allowable lateral output.
In one embodiment, the speed characteristic is a measured vessel speed of the marine vessel.
In another embodiment, the speed characteristic is based on a propulsion output of a second marine drive configured to propel the marine vessel, wherein the propulsion output is at least one of a rotational speed of the second marine drive, a torque output of the second marine drive, a throttle position of the second marine drive, a demand percent of the second marine drive.
Optionally, the second marine drive is a rear marine drive on the marine vessel, and the method includes controlling thrust of the rear marine drive based on the propulsion demand input and the lateral thrust command, wherein only the lateral marine drive is controlled based on the maximum allowable lateral output.
In another embodiment, the maximum allowable lateral output is at least one of a rotational speed of the lateral marine drive, a current delivery to the lateral marine drive, a torque output of the lateral marine drive, or a demand percent for the lateral marine drive.
In another embodiment, the method includes setting the maximum allowable lateral output equal to a maximum capability of the lateral marine drive when the speed characteristic is less than a first speed threshold, and setting the maximum allowable lateral output to less than the maximum capability of the lateral marine drive when the speed characteristic is greater than the first speed threshold.
In another embodiment, the method includes progressively decreasing the maximum allowable lateral output as the speed characteristic becomes progressively greater than a first speed threshold.
In another embodiment, the method includes setting the maximum allowable lateral output to zero when the speed characteristic exceeds a maximum speed threshold.
In another embodiment, the method includes determining the lateral thrust command includes utilizing a closed-loop yaw controller to determine the lateral thrust command based at least in part on sensed yaw motion of the marine vessel.
In another embodiment, the method includes storing a map configured to correlate all possible propulsion demand inputs from the user input device and speed characteristics to thrust commands for the lateral marine drive, and utilizing the map to determine the lateral thrust command based on the propulsion demand input received from the user input device and a current speed characteristic.
Various other features, objects, and advantages of the invention will be made apparent from the following description taken together with the drawings.
The present disclosure is described with reference to the following Figures.
The inventors have recognized a need for vessel control systems and methods that provide improved control over lateral and rotational movement of the marine vessel and enable a full range of vessel movement, such as via joystick control, on a marine vessel. Additionally, the inventors have recognized a need to provide vessel control systems with integrated user input control over steering and thrust that are operable to control all drives in the propulsion system over a wide range of vessel speeds and conditions, such as a single user input device for controlling propulsion during docking and for controlling propulsion while the vessel is on plane. The inventors have recognized that lateral thrust output will have different impacts at low speed, such as for docking, than at high speeds, such as when the vessel is on plane.
Based on the foregoing problems and challenges in the relevant art, the inventors developed the disclosed propulsion systems and methods providing a full range of joystick control on vessels with lateral and rear marine drives that is also operable to control propulsion at higher vessel speeds. The control system and method are configured to operate the lateral marine drive, the rear marine drive, or both simultaneously depending on the propulsion demand input. As explained in more detail below, the selection of which drive(s) to operate for effectuating operator-demanded thrust may also depend on a mode of operation of the user interface system and/or a speed characteristic of propulsion, such as a vessel speed or an output of one or more other drives in the system 100 (e.g., RPM, torque, throttle position, etc.). For example, the speed characteristic may be based on an output parameter of one or more rear marine drives. In examples described herein, the output of the lateral marine drive is moderated, significantly reduced, or eliminated as the vessel speed or other propulsion speed characteristic increases. Thereby, the system provides appropriate and safe propulsion output to effectuate the user commanded propulsion and accounts for the speed of travel and mode of operation.
The system is configured to determine a maximum allowable lateral output based on a speed characteristic of propulsion, such as a vessel speed or a propulsion output of the rear marine drive or other marine drive in the propulsion system, and to control the lateral marine drive such that it does not exceed that maximum allowable lateral output. Thereby, user input authority over lateral propulsion is limited based on the speed characteristic, where the user's input at the user input device is only effectuated up to the maximum allowable lateral output. The propulsion control system may be configured to progressively limit the user input authority as the speed characteristic increases, for example to decrease a maximum allowable thrust output magnitude of the lateral marine drive as the vessel speed increases. The maximum allowable lateral output may be any control variable tied to the lateral thrust magnitude produced by the lateral marine drive, such as is at least one of a rotational speed (RPM) of the lateral marine drive, a current delivery to the lateral marine drive (for embodiments where the lateral drive 15 has an electric motor powerhead), torque output of the lateral marine drive, or a demand percent for the lateral marine drive (a percent of the maximum possible output command that is currently commanded to the lateral drive).
A single user input device, such as a joystick, may be configured to provide unified control input for both the lateral drive and one or more rear drives—i.e., to control steering and thrust of the rear marine drive and to control thrust of a lateral marine drive based on a propulsion demand input at the user input device. The propulsion system is configured to optimize the starboard and port thrusts from the lateral drive, in conjunction with the rear thrust from one or more steerable rear drives, to most efficiently and effectively generate sway movement and/or yaw movement commanded by the user. The lateral marine drive may be a discrete drive that operates only at one predetermined rotational speed and thus is only controllable to be turned on and off (such as pulsed on and off, where pulse widths can be lengthened to increase lateral thrust output). Alternatively, the lateral marine drive may be a variable speed drive wherein the rotational speed is controllable by the control system to generate variable thrust outputs.
The lateral marine drive may be mounted in an area of the bow of the marine vessel and controllable in forward and reverse directions to generate starboard and port directional thrusts at the bow. The lateral marine drive may be mounted at a fixed angle with respect to the vessel such that it is not steerable and is configured to generate starboard and port thrusts at a fixed angle (such as perpendicular to the centerline of the vessel). In certain embodiments, the starboard or port thrust, including the yaw moment of the lateral marine drive thrust, is integrated into and accounted for in the propulsion control scheme such that the thrusts generated by the lateral marine drive and the rear marine drive(s) are totaled and each individual drive is controlled so that the total surge and sway thrusts effectuated by all drives in the propulsion system results in the commanded lateral sway movement and/or surge movement and the total yaw thrust effectuated by all drives in the propulsion system results in the commanded rotational yaw movement.
The control system and method are configured to operate the lateral marine drive, the rear marine drive, or both simultaneously depending on the propulsion demand input. As explained in more detail below, the selection of which drive(s) to operate for effectuating operator-demanded thrust may also depend on a mode of operation of the user interface system and/or a speed characteristic, such as a vessel speed or an output (e.g., RPM) of the rear marine drive(s).
In certain yaw and/or sway demand ranges, in certain operation modes, and/or at propulsion speed ranges, the control system may be configured to operate only the lateral marine drive or only the rear marine drive to generate the commanded thrust. For example, the control system may be configured to operate only the lateral marine drive to generate yaw thrust when the propulsion demand input is within a low yaw demand range. Where the lateral marine drive is an electric drive and the rear marine drive is combustion-powered, controlling at least a portion of the thrust range using only the rear marine drive may be effectuated to conserve battery power utilized by the lateral marine drive. However, the lateral marine drive is operated such that it remains at or below the maximum allowable lateral output calculated based on the speed characteristic of propulsion.
In both depicted embodiments, propulsion system 100 further includes a lateral marine drive 15 configured to effectuate lateral thrust on the vessel 10 in the starboard and port directions. The lateral marine drive is fixed, not steerable, such that it produces port-direction or starboard-direction lateral thrusts at fixed angles with respect to the marine vessel, such as perpendicular to the centerline CL. In the depicted example, the lateral marine drive 15 is an electric drive positioned at a bow region 11 of the vessel 10 configured to effectuate lateral thrust at the bow, which may also be referred to as a bow thruster. The bow region 11 is near the bow of the vessel so as to be in front (toward the bow) of the COT 30. Bow thrusters are known to those skilled in the art, as are other types and locations of marine drive arrangements configured to only effectuate lateral thrusts on the vessel 10, which may be placed at other locations on the vessel 10 besides the bow region 11. The lateral marine drive 15 may also be deployable for use and retractable when not in use, such as deployable for docking and stowed for on plane boating. Exemplary deployable lateral marine drives are described in U.S. application Ser. Nos. 17/185,289, 17/388,850, and 17/553,245, which are hereby incorporated by reference in their entireties. In embodiments where the lateral marine drive 15 is deployable and retractable in response to a user input, such as a user input to engage a docking or other joysticking mode where the lateral drive 15 is utilized. The lateral marine drive 15 may be a discrete drive, or discrete thruster, that operates only at a predetermined RPM and thus is only controllable by turning on and off the drive. Alternatively, the lateral marine drive 15 may be a proportional drive, or proportional thruster, wherein the rotational speed (e.g., rotations per minute RPM) is controllable by the control system 33 between a minimum RPM and a maximum RPM that the drive is capable or rated to provide. A person having ordinary skill in the art will understand in view of the present disclosure that the disclosed propulsion system 100 may include other types and locations of lateral marine drives 15, which may be an alternative to or in addition to a lateral drive 15 positioned at the bow.
The lateral marine drive 15 may include a propeller 16, sometimes referred to as a fan, that is rotated by a bi-directional motor 17 in forward or reverse direction to effectuate lateral thrust in the starboard or port directions. In such an embodiment, the lateral marine drive 15 is configured to rotate in a first direction to generate a starboard direction lateral thrust and to rotate in an opposite direction of the first direction to generate a port direction lateral thrust. The controller 34 may be communicatively connected to a drive controller 18 for the lateral marine drive 15 to control activation and direction of thrust by the lateral marine drive 15. Where the lateral drive 15 is configured as a discrete drive, the controller 18 provides on/off and directional control of the motor 17, and thus rotate in the clockwise and counterclockwise directions at a single speed. The controller 34 may be configured to modulate the duty cycle of the discrete lateral drive to achieve desired thrust outputs. In other embodiments, the lateral marine drive 15 is a variable speed drive, wherein the motor 17 is controllable to rotate the propeller 16 at two or more speeds. For example, the motor 17 may be a brushless DC motor configured for variable multi-speed control of the propeller 16 in both the clockwise and counterclockwise rotation directions to effectuate a range of lateral thrust outputs.
Where one or more of the marine drives 15, 21, 22 is an electric drive—i.e., having a powerhead being an electric motor—the propulsion system 100 will include a power storage device 19 powering the motor(s) thereof. The power storage device 19, such as a battery (e.g., lithium-ion battery) or bank of batteries, stores energy for powering the electric motor(s) (e.g., motor 17) and is rechargeable, such as by connection to shore power when the electric motor is not in use or by an on-board alternator system drawing energy from engine-driven marine drives (if any) on the marine vessel. The power storage device 19 may include a battery controller 20 configured to monitor and/or control aspects of the power storage device 19. For example, the battery controller 20 may receive inputs from one or more sensors within the power storage device 19, such as a temperature sensor configured to sense a temperature within a housing of the power storage device where one or more batteries or other storage elements are located. The battery controller 20 may further be configured to receive information from current, voltage, and/or other sensors within the power storage device 19, such as to receive information about the voltage, current, and temperature of each battery cell within the power storage device 19. In addition to the temperature of the power storage device, the battery controller 20 may be configured to determine and communicate a charge level to the central controller 34 and/or another controller within the control system 33. The charge level may include one or more of, for example, a voltage level of the power storage device, a state of charge of the power storage device 19, a state of health of the power storage device 19, etc.
The propulsion system 100 further includes a user input device 40, such as a joystick or a keypad, operable by a user to provide at least a lateral movement demand input and rotational movement demand input. The user input device enables a user to give a lateral propulsion demand commanding sway movement of the marine vessel, or longitudinal movement along the y-axis, without requiring surge movement along the x-axis. The user input device also enables a user to give a rotational propulsion demand input commanding rotational movement of the marine vessel 10 about the COT 30 without lateral or surge movements.
The disclosed system and method enable lateral and rotational movement of the marine vessel, such as that illustrated in
The user steering inputs provided at the user input device 40 are received by the control system 33, which may include multiple control devices communicatively connected via a communication link, such as a CAN bus (e.g., a CAN Kingdom Network), to control the propulsion system 100 as described herein. The control system 33 includes a central controller 34 communicatively connected to the drive control module (DCM) 41, 42 for each of the rear marine drives 21 and 22, the DCM 18 of the lateral marine drive 15, and may also include other control devices such as the battery controller 20. Thereby, the controller 34 can communicate instructions to the DCM 41, 42 of the rear drives to effectuate a commanded magnitude of thrust and a commanded direction of thrust (forward or reverse), as is necessary to effectuate the lateral and/or rotational steering inputs commanded at the user input device 40. The controller also communicates a steering position command to the steering actuators 13, 14 to steer each of the rear marine drives 21, 22. Drive position sensors 44, 45 are configured to sense the steering angle, or steering position, of one of the drives 21, 22. The central controller 34 also communicates a command instruction to the DCM 18 for the lateral marine drive, wherein the commands to the various drives 15, 21, 22 are coordinated such that the total of the thrusts from the rear and lateral marine drives yields the user's propulsion demand input. A person of ordinary skill in the art will understand in view of the present disclosure that other control arrangements could be implemented and are within the scope of the present disclosure, and that the control functions described herein may be combined into a single controller or divided into any number of a plurality of distributed controllers that are communicatively connected.
Certain examples are depicted and described for systems with a single rear marine drive. A person of ordinary skill in the art will understand in view of the present disclosure that the described embodiments may be adapted for use with propulsion systems having two or more rear marine drives, such as the exemplary system depicted in
In certain embodiments, the user input device 40 may be operable in multiple modes selectable by a user. For example, the user input device 40 may be operable in a first mode to control only the lateral marine drive 15. The user input device 40 may also be operable in a second mode to control both the lateral marine drive 15 and the rear marine drive 21 in conjunction, such as according to one or more of the embodiments described herein. Alternatively or additionally, the user input device 40 may be operable in a mode to enable separate control of both the lateral marine drive 15 and the rear marine drive 21, such as where the rear marine drive is controlled by certain movements of the joystick 40a and the rear drive 21 is controlled by other movements of the joystick 40a. To provide one example for illustration, the system may be configured such that twist movement of the joystick 40a controls the lateral thrust produced by the lateral marine drive 15 and sideways deflection of the joystick 40a controls steering and/or propulsion magnitude of the rear marine drive 21. Conversely, the system may be configured such that twist movement of the joystick 40a controls thrust and/or steering of the rear marine drive 21 and sideways deflection of the joystick 40a controls the lateral thrust produced by the lateral marine drive 15. Thereby, the user can select which drive to control by selectively controlling the joystick, and can control both simultaneously, such as by manipulating the joystick with a sideways deflection and a twist movement.
The propulsion system 100 may be configured such that the user can select an operation mode for the user input device 40, for example via buttons or other user interface elements on the joystick or elsewhere at the helm. Alternatively or additionally, the system 100 may be configured to automatically select one or more of the operation modes based on engagement of various user input devices. To provide one example, the controller 34 may automatically engage the first control mode if the joystick (or other multi-directional user interface device 40) is engaged and one or more helm levers (e.g., throttle/shift levers) associated with the rear marine drive 21 are being operated to control the drive 21. There, control of the rear marine drive 21 will be provided by the helm lever and the user input device 40, such as the joystick 40a, will control only the lateral marine drive 15 (and/or any other lateral drives included within the propulsion system 100).
Where the user input device 40 is configured to operate in multiple modes, the control system 33 is configured to require user selection of the above-described second or third modes before employing the control methods described herein. Such user selection may be provided by selecting the above-described operation mode on an input element, such as a mode selection button on the joystick or a touch screen at the helm. For example, the second mode may be selectable by selecting engagement of a “joysticking mode” or a “docking mode”, such as via a respective selection button on the user interface 40 or a touch screen at the helm. Alternatively, such user selection may be provided by selective engagement and disengagement of various user input elements at the helm. For example, the second mode may be selectable by engaging the user interface 40, such as the joystick or touchpad, and disengaging all other helm thrust control elements for the marine drives, such as putting all throttle/shift levers in neutral or otherwise deactivating the steering and/or thrust control functions.
The disclosed propulsion system 100 enables joystick control, or control by another user input device operable to provide lateral and rotational thrust control, of both the rear and lateral marine drives simultaneously. Optionally, such as based on a mode selection, the drives may be controlled automatically based on a single user input commanding a thrust magnitude and direction such that the drives operate to provide precise and seamless sway and yaw control of the vessel 10. Alternatively, the user input device may enable a user to input simultaneous control instructions for each of the lateral and rear drives 15 and 21.
Where a lesser steering angle range is available, some incidental surge thrust may be generated, as explained more below. To effectuate yaw movement to turn the vessel about its COT 30 without causing surge or sway movements, the control system 33 may utilize the rear marine drive 21 generating forward or reverse thrust to push the stern in the desired direction and may utilize the lateral drive 15 to push the bow in the opposite direction to generate the total commanded yaw thrust. Alternatively, yaw may be effectuated (perhaps with some minimal surge and/or sway) using only the rear drive 21 or only the lateral drive 15. Exemplary scenarios are illustrated and described below.
The controller 34 may be configured to utilize yaw rate, such as from an inertial measurement unit (IMU) 26 or other rotational sensor capable of measuring yaw of the marine vessel 10, as the basis for controlling thrust magnitude and direction from one or both drives 15 and 21. The sensed yaw rate can be used as feedback control for adjusting the thrust commands. Namely, the controller 34 may determine an expected yaw rate, or yaw velocity, associated with the lateral and/or rotational thrust command from the user input device 40 and may compare the measured yaw rate and/or rate of lateral movement from the IMU 26 to the expected value(s) and adjust the thrust commands to reduce the difference between the measured and expected values, such as between the measured yaw rate and the expected yaw rate.
Depending on the types and thrust capabilities of the various marine drives 15 and 21 on the vessel 10, it may be preferable to meet a commanded yaw thrust utilizing only the lateral marine drive 15 or only the rear drive 21. For example, where the rear marine drive 21 are configured for high thrust output, it may be preferable to utilize only the lateral marine drive 15 when the propulsion demand input is within a low yaw demand range, which may be at or below the minimum thrust capabilities of the rear marine drive 21 and/or may yield smoother and more comfortable operation for the user by minimizing shifting of the rear marine drive.
Operating the lateral marine drive in concert with the rear marine drive can yield a greater total yaw velocity when the thrust generated by all of the marine drives are additive.
Further, operation of both the lateral drive 15 and the rear drive 21 can be coordinated such that the incidental sway components cancel, or at least partially counteract, each other. In the example in
In
Thus, the lateral marine drive 15 is likely controlled intermittently during surge motions to effectuate the lateral thrust 115 to counteract any measured yaw change. For example, the direction and magnitude of the lateral thrust 115 may be determined and effectuated by the control system 33 in response to and based on sensed yaw changes, such as based on the direction and magnitude of yaw velocity and/or yaw acceleration of the vessel 10 measured by the IMU 26.
The example in
Referring again to
In other embodiments, the system may be configured to provide integrated user input control, where the user provides a single input motion representing desired motion of the vessel and the control system operates both the lateral and rear drive based on the single user input to effectuate the commanded movement. In such embodiments, the control system 33 is configured to selectively activate the lateral drive 15 and/or rear drive 21 to accomplish the desired vessel motion, and may be configured to account for additional system constraints such as battery charge level and drive capabilities and responsiveness, or additional environmental constraints such as wind and waves. Thereby, lateral drive output and rear drive output (including lateral drive thrust direction and magnitude, rear drive steering, and rear drive output/RPM) are blended to provide proportional maneuverability of the vessel in the axis that the joystick handle 66 is deflected.
The propulsion system 100 may be configured with a velocity-based control system 33 where the user inputs are correlated with inertial velocity values for the marine vessel. In one such embodiment, the control system may be a model-based system where the thrust outputs are determined based on modeled vessel behavior that accounts for the vessel dimensions and the locations and thrust capabilities of each of the lateral and rear marine drives. Alternatively, the control system 33 may be configured to utilize a map relating joystick positions to thrust magnitude outputs, including magnitude and direction, for each of the lateral and rear marine drives.
Signals from the joystick user input device 40a (e.g., a percent deflection +/−100% in each of the axis directions) are provided to the command model 72, which computes the desired inertial velocity or desired acceleration based on the raw joystick position information. The inertial velocity may include a surge velocity component, a sway velocity component, and/or a yaw velocity component. The command model 72 is configured based on the locations and thrust capabilities of the drives and the vessel response to accurately approximate how fast the vessel will translate and/or turn in response to a user input. In certain embodiments, the command model may be tunable by a user to adjust how aggressively the propulsion system 100 will respond to user inputs. For example, secondary inputs may be provided that allow a user to input preference as to how the vessel will respond to the joystick inputs, such as to increase or decrease the desired inertial velocity values associated with the joystick positions and/or to select stored profiles or maps associated with user input values to desired velocity values. For example, the user inputs may allow a user to instruct an increase or decrease in the aggressiveness of the velocity response and/or to increase or decrease a top speed that the full joystick position (e.g. pushing the joystick to its maximum outer position) effectuates.
For example, the command model 72 may include a map correlating positions of the joystick to inertial velocity values, associating each possible sensed position of the joystick to a target surge velocity, a target sway velocity, and/or a target yaw velocity. For example, the neutral, or centered, position in the joystick is associated with a zero inertial velocity.
Output from the command model 72, such as target surge, sway, and yaw velocities (or could be desired surge, sway, and yaw acceleration), is provided to the drive controller 76. The drive controller 76 is configured to determine thrust commands, including desired thrust magnitude and desired direction, for each of the drives 15 and 21 based on the target surge, sway, and yaw velocities or accelerations. The drive controller 76 may be a model-based controller, such as implementing a vessel dynamics model (e.g., an inverse plant model), optimal control modeling, a robust servo rate controller, a model-based PID controller, or some other model-based control scheme. In a closed-loop vessel dynamics model controller embodiment, the model is utilized to both calculate feed-forward commands and incorporate feedback by comparing a target inertial velocity or target acceleration to an actual measured velocity and/or measured acceleration of the marine vessel. In a robust servo rate controller embodiment, the model is utilized to calculate feed-forward commands and the gains are computed off-line and incorporated into the control algorithm. In some embodiments, two or more different control models may be utilized, such as for calculating thrust commands for different directional control.
The control model is generated to represent the dynamics and behavior of the marine vessel 10 in response to the propulsion system 100, and thus to account for the hull characteristics and the propulsion system characteristics. The hull characteristics include, for example, vessel length, a vessel beam, a vessel weight, a hull type/shape, and the like. The propulsion system characteristics include, for example, the location and thrust capabilities of each marine drive in the propulsion system 100. In certain embodiments, the model for each vessel configuration may be created by starting with a non-dimensionalized, or generic, vessel model where the hull characteristics and the propulsion system characteristics are represented as a set of coefficients, or variables, that are inputted to create a vessel model for any vessel hull and any propulsion system in the ranges covered by the model. The set of coefficients for the hull characteristics may include, for example, a vessel length, a vessel beam, a vessel weight, and a hull shape or type.
The generic model may be created utilizing stored thrust information (e.g., representing the thrust magnitude generated by the drive at each command value, such as demand percent) associated with a set of predefined drive identification coefficients. An exemplary set of coefficients for the propulsion system characteristics may include location of each marine drive and drive identification information associated with the corresponding thrust characteristics saved for that drive, such as drive type, drive size, and/or make/model, as well as available steering angle ranges for each steerable drive.
Alternatively, the drive controller 76 may implement a different, non-model-based, control strategy, such as a calibrated map correlating the target surge, target sway, and target yaw velocities/accelerations to thrust commands for each drive in the propulsion system 100 or a calibrated map correlating joystick positions to thrust commands for each drive in the propulsion system 100. Additionally, the map may be configured to account for further control parameters in the thrust command determinations, such as battery charge level (e.g., battery SOC), of a power storage system associated with one or more of the marine drives 15 and 21, generated fault conditions for one or more of the marine drives 15 and 21, or the like, whereby each control parameter is represented as an axis on the map and a corresponding input is provided for determining the thrust commands.
The output of the drive controller 76 is compared to the joystick position information at summing point 81 (e.g., to the percent deflection value). The summed output is again subject to a limiter 82, which limits the authority of the controller 76 and accounts for fault modes. The output of the limiter 82 is summed with the joystick values at summing point 83. That summed value is provided to the affine control mixer 86, which generates a total X and Y direction command for the marine drive. From there, the powerhead control commands, shift/motor direction commands, and steering actuator control commands (for the steerable drives) are determined for each marine drive 15 and 21. An exemplary embodiment of affine mixing is described in U.S. Pat. No. 10,926,855, which is incorporated herein by reference.
In certain embodiments, the drive controller 76 may be configured and implemented as a closed-loop control system, wherein the thrust commands are further calculated based on comparison of the measured and target values. In the closed-loop control strategy depicted in
Where the drive controller 76 is a map-based controller, a PID controller may be utilized in conjunction with the map-determined thrust commands to determine the final outputted thrust commands and provide closed-loop control.
Alternatively, control may be implemented in an open-loop, or feed-forward, control strategy. In a feed-forward-only command regime, the output of the drive controller 76 is utilized to control the marine drives—i.e., inputted to the affine control mixer 86 to generate thrust magnitude commands for both drives and steering commands for the rear drive 21. Accordingly, the command model 72, drive controller 76, and affine control mixer 86 can be utilized, without the feedback portion of the system depicted in
The steering angles “Ay Cmd” outputted by the command model 172 are provided to a gain calculator 178 configured to calculate the gain and then to limiter 182, which limits the authority to steer the drive 21 and accounts for fault modes. The target sway velocity VyCmd is provided to a model-based sway controller 176a, such as a vessel dynamics control model described above, configured to calculate the thrust command for the rear marine drive 21, including a thrust magnitude command. (e.g., an engine or motor command value tied to thrust output) and a thrust direction (e.g., forward or reverse).
The target yaw command “R Cmd” output of the command model 172 is provided to the model-based yaw rate controller 176b, which in this embodiment is implemented with a robust servo control design to control yaw rate with the lateral marine drive. Thus, the yaw rate controller 176b is configured to calculate a thrust command for the lateral marine drive 15, including a thrust magnitude command (e.g., demand percent or some other value tied to thrust output) and a thrust direction (e.g., forward or reverse directions tied to starboard or port thrust direction) provided to the lateral marine drive 15 based on the target yaw command “R Cmd” and the measured yaw command. Where the target yaw command is zero, and thus no yaw motion is desired, the yaw rate controller 176b operates to command the lateral drive 15 to generate a counteracting yaw thrust to oppose any unwanted yaw motion. For example, where the user operates the joystick 40a to command a straight rearward motion of the vessel such as exemplified in
The control strategies for the sway and yaw controllers may be implemented as closed-loop algorithms, as shown, where each of the sway and yaw controllers 176a and 176b incorporates feedback by comparing the target values to measured values. The yaw rate controller 176b receives yaw rate measurements from the sensors 39 (e.g., IMU 26) and/or navigation controller 41 and compares the measured value to the yaw command R Cmd. To effectuate a pure sway motion, for example, the yaw rate controller 176b will be targeting a yaw rate of zero and will adjust the thrust generated by the lateral marine drive to maintain zero yaw change.
The sway controller 176a receives sway velocity measurements from the sensors 39 (e.g., IMU 26) and/or navigation controller 41 and compares the measured value to the sway command “Vy Cmd”. To effectuate a pure yaw motion, for example, the yaw rate controller 176b will be targeting a sway velocity of zero and will adjust the thrust generated by the rear marine drive 21 in concert with the output of the lateral drive 15 to maintain zero sway change (or to minimize uncommanded sway as much as possible within the constraints of the propulsion system).
In some embodiments, one or both of the sway controller 176a and yaw controller 176b may instead implement an open-loop strategy where the output of one or both of the controllers 176a, 176b is utilized to control the marine drives based on the respective control models without utilizing any feedback. This control strategy, which results in a very drivable and safe propulsion system 100, can be implemented on its own as a control strategy or can be implemented as a default state when the feedback portion of a closed-loop control system is inoperable (such as due to failure of navigation systems or sensors).
The disclosed system and method provide user input control of the rear and lateral marine drives via a single user input device 40 and may also be configured to enable propulsion control for various speed conditions, including for low-speed docking and for on-plane vessel control. To that end, the control system 33 may be configured to determine a maximum allowable lateral output based on a speed characteristic of propulsion, such as a vessel speed or a propulsion output of the rear marine drive 21, and to control the lateral marine drive such that it does not exceed that maximum allowable lateral output. The user input authority over lateral propulsion is thus limited based on the speed characteristic, where the user's input at the user input device 40 is only effectuated up to the maximum allowable lateral output. The propulsion control system 33 may be configured to progressively limit the user input authority as the speed characteristic increases, for example to decrease a maximum allowable thrust output magnitude of the lateral marine drive 15 as the vessel speed increases. The maximum allowable lateral output may be any control variable tied to the lateral thrust magnitude produced by the lateral marine drive 15, such as is at least one of a rotational speed of the lateral marine drive, a current delivery to the lateral marine drive, a torque output of the lateral marine drive, a throttle position of the lateral marine drive (if the powerhead is an internal combustion engine), a demand percent for the lateral marine drive, or other value associated with output control.
Where the propulsion system 100 includes multiple marine drives in addition to the lateral drive 15, such as multiple rear marine drives (e.g., drives 21 and 22), the control system 33 may be configured to utilize the propulsion output of one or more of the other marine drives as the speed characteristic. For example, the speed characteristic may be an average of measured propulsion output values from a plurality of drives, such as an average RPM of multiple rear marine drives taken over a predefined period of time.
When the speed characteristic of propulsion is in a lower speed range, full output authority for controlling the lateral marine drive is provided. For example, in the lower speed range, the maximum allowable lateral output may be equal to a maximum capability of the lateral marine drive, such as a maximum RPM or a maximum torque output rated for the lateral marine drive, or 100 percent demand. The lower speed range may be defined based on a first speed threshold 194 below which full output authority over the lateral marine drive 15 is granted. Thus, in the lower speed range below the first speed threshold 194, the lateral marine drive 15 is controlled based on user input up to the maximum permitted output (e.g., the maximum rated capability) of the lateral marine drive.
Above the first speed threshold 194, the maximum allowable lateral output decreases, and may be configured as shown in
The maximum allowable lateral output may be zero in an upper speed range of the speed characteristic so that the lateral marine drive 15 does not produce any thrust output at high speeds, such as when the marine vessel is on plane. As exemplified in
The maximum speed threshold 196 at which the maximum allowable lateral output 192 is set to zero may be anywhere between the first speed threshold and the absolute maximum speed 198, and may be a configurable value based on the configuration of the marine vessel, including the hull shape, vessel stability, propulsion capabilities, intended purpose of the vessel 10, etc. For example, the maximum speed threshold 196 may be set equal to or less than an expected planing speed of the marine vessel 10. Alternatively, the maximum speed threshold 196 may be significantly less than the planing speed. In one example, the maximum speed threshold 196 such as at or above the upper end of a traditional joysticking speed range, such as around 10-12 miles per hour or propulsion output values associated therewith. In still other embodiments, some lateral propulsion output may be permitted for speed characteristics above the expected planing speed threshold. For example, large and stable vessels, some non-zero percentage of lateral output authority may be maintained up to the absolute maximum speed 198.
A maximum allowable lateral output is then determined at step 304 based on the speed characteristic. In one embodiment, a table may be stored in memory and utilized by the control system providing maximum allowable lateral output values indexed based on speed characteristic values. Alternatively, the control system 33 may be configured to calculate the maximum allowable lateral output value by a formula relating allowable output to speed characteristic. In still other embodiments, such as in the model-based embodiments described above, the model may be configured to limit lateral output authority at high speeds, by using a vessel model that may factor in information such as, but not limited to, hull weight, hull size, and/or engine propeller thrust to calculate what engine demand or rpm will result in the desired lateral authority speed limit. A model-based strategy may use the vessel characteristics, such as hull size, weight, and propeller specifications, to solve for an engine demand/rpm that will specify one or more speeds at which to cut off or reduce the thruster authority. The speed characteristic (e.g., demand or RPM command) of the rear drive(s) is then used to determine when to reduce or block the thruster.
In certain embodiments, the user thrust command associated with the user input device position, such as the joystick handle 66 position, may be remapped based on the maximum allowable lateral output. For example, the maximum handle deflection in the sideways direction 67a (
The lateral marine drive 15 is then controlled so as not to exceed the maximum allowable lateral output. The lateral marine drive 15 is controlled based on user input, such as at the joystick 40A, such that the output may be less than the maximum allowable lateral output but does not exceed that value. In embodiments with integrated control of the rear marine drive 21 based on a single propulsion demand input, the control system 33 increases propulsion output of the rear marine drive 21 to compensate where possible for the decrease in output from the lateral marine drive 15. Regardless, only the lateral marine drive 15, or multiple lateral marine drives, configured to provide lateral propulsion output and not rear propulsion, are controlled based on the maximum allowable lateral output. Thus, rear propulsion output is granted full authority even when the lateral output authority is limited.
If the vessel speed does exceed the first speed threshold at step 314, then the maximum allowable lateral output is calculated to limit user authority over lateral thrust by the at least one lateral marine drive 15. In the depicted example, instructions are executed at step 318 to determine whether the vessel speed exceeds a maximum speed threshold. If the vessel speed is between the first speed threshold and the maximum speed threshold, then a maximum allowable RPM is determined at step 320, which will be less than the maximum capability of the lateral marine drive 15 and less than an absolute maximum speed characteristic for the lateral drive 15. For example, a maximum allowable RPM of the lateral marine drive 15 may be determined as the output limitation of the lateral marine drive 15, where the maximum allowable RPM is less than the RPM capability of the lateral marine drive 15.
Once the vessel speed exceeds the maximum speed threshold, then the maximum allowable RPM is set to zero, as presented by step 322. At step 324, the lateral marine drive 15 is controlled based on user input up to the maximum allowable RPM or other maximum allowable lateral output value. When the maximum allowable RPM or other maximum allowable lateral output value is set to zero, then the lateral marine drive 15 is not permitted to generate any lateral thrust output.
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to make and use the invention. Certain terms have been used for brevity, clarity, and understanding. No unnecessary limitations are to be inferred therefrom beyond the requirement of the prior art because such terms are used for descriptive purposes only and are intended to be broadly construed. The patentable scope of the invention is defined by the claims and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have features or structural elements that do not differ from the literal language of the claims, or if they include equivalent features or structural elements with insubstantial differences from the literal languages of the claims.
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