Systems and methods for setting engine speed in a marine propulsion device
First Claim
1. A method for setting an engine speed of an internal combustion engine in a marine propulsion device of a marine propulsion system to an engine speed setpoint, the method comprising:
- determining the engine speed setpoint based on an operator demand;
predicting a position of a throttle valve of the engine that is needed to achieve the engine speed setpoint;
determining a feed forward signal that will move the throttle valve to the predicted position;
after moving the throttle valve to the predicted position, adjusting the engine speed with a feedback controller so as to obtain the engine speed setpoint;
accepting an operator selection of a control mode in which to operate the marine propulsion system from a plurality of different control modes; and
based on the operator-selected control mode, selecting limits on an authority of the feedback controller to adjust the engine speed from a plurality of different authority limits.
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Abstract
A method for setting an engine speed of an internal combustion engine in a marine propulsion device of a marine propulsion system to an engine speed setpoint includes determining the engine speed setpoint based on an operator demand and predicting a position of a throttle valve that is needed to achieve the engine speed setpoint. The method also includes determining a feed forward signal that will move the throttle valve to the predicted position, and after moving the throttle valve to the predicted position, adjusting the engine speed with a feedback controller so as to obtain the engine speed setpoint. An operating state of the marine propulsion system is also determined. Depending on the operating state, the method may include determining limits on an authority of the feedback controller to adjust the engine speed and/or determining whether the operator demand should be modified prior to determining the engine speed setpoint.
55 Citations
20 Claims
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1. A method for setting an engine speed of an internal combustion engine in a marine propulsion device of a marine propulsion system to an engine speed setpoint, the method comprising:
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determining the engine speed setpoint based on an operator demand; predicting a position of a throttle valve of the engine that is needed to achieve the engine speed setpoint; determining a feed forward signal that will move the throttle valve to the predicted position; after moving the throttle valve to the predicted position, adjusting the engine speed with a feedback controller so as to obtain the engine speed setpoint; accepting an operator selection of a control mode in which to operate the marine propulsion system from a plurality of different control modes; and based on the operator-selected control mode, selecting limits on an authority of the feedback controller to adjust the engine speed from a plurality of different authority limits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for setting an engine speed of an internal combustion engine in a marine propulsion device of a marine propulsion system to an engine speed setpoint, the method comprising:
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operating the marine propulsion system in a joysticking mode, in which a direction and a magnitude of thrust of the marine propulsion device are determined based on a position of a joystick; accepting an operator demand from the joystick; modifying the operator demand to account for one of a gear ratio and a pitch of a propeller of the marine propulsion device; determining the engine speed setpoint based on the modified operator demand; predicting a position of a throttle valve of the engine that is needed to achieve the engine speed setpoint; determining a feed forward signal that will move the throttle valve to the predicted position; and after moving the throttle valve to the predicted position, adjusting the engine speed with a feedback controller so as to obtain the engine speed setpoint. - View Dependent Claims (10, 11)
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12. A method for setting an engine speed of an internal combustion engine in a marine propulsion device of a marine propulsion system to an engine speed setpoint, the method comprising:
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determining the engine speed setpoint based on a current operator demand; predicting a position of a throttle valve of the engine that is needed to achieve the engine speed setpoint; determining a feed forward signal that will move the throttle valve to the predicted position; after moving the throttle valve to the predicted position, adjusting the engine speed with a feedback controller so as to obtain the engine speed setpoint; determining if the engine speed is one of accelerating and decelerating toward the engine speed setpoint; calculating a demand delta between the current operator demand and a previous operator demand; and using the demand delta and the engine speed setpoint to determine limits on an authority of the feedback controller to adjust the engine speed. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification