Marine propulsion system with efficient engine speed delta
First Claim
1. A method for changing controlled engine speed of a marine internal combustion engine in a marine propulsion system for propelling a marine vessel, wherein said engine is operated at an operator-selected engine speed and an engine speed control system maintains engine speed at said operator-selected engine speed, said engine having a throttle controlling engine speed according to throttle position,said method comprising:
- responding to said operator changing said operator-selected engine speed, from a first-selected engine speed to a second-selected engine speed, by predicting throttle position needed to provide said second-selected engine speed;
providing a feed forward signal moving said throttle to the predicted throttle position;
after said movement of said throttle to said predicted throttle position, using said engine, speed control system to maintain engine speed at said second-selected engine speed;
responding to said operator changing said operator-selected engine speed, from said first-selected engine speed to said second-selected engine speed, by predicting throttle position needed to provide requisite engine airflow per cylinder, APC, needed to provide said second-selected engine speed; and
using a normalized APC calculation to predict required throttle position to achieve said second-selected engine speed.
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Accused Products
Abstract
A system and method is provided for efficiently changing controlled engine speed of a marine internal combustion engine in a marine propulsion system for propelling a marine vessel. The system responds to the operator changing the operator-selected engine speed, from a first-selected engine speed to a second-selected engine speed, by predicting throttle position needed to provide the second-selected engine speed, and providing a feed forward signal moving the throttle to the predicted throttle position, without waiting for a slower responding PID controller and/or overshoot thereof, and concomitant instability or oscillation, and then uses the engine speed control system including any PID controller to maintain engine speed at the second-selected engine speed.
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Citations
16 Claims
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1. A method for changing controlled engine speed of a marine internal combustion engine in a marine propulsion system for propelling a marine vessel, wherein said engine is operated at an operator-selected engine speed and an engine speed control system maintains engine speed at said operator-selected engine speed, said engine having a throttle controlling engine speed according to throttle position,
said method comprising: -
responding to said operator changing said operator-selected engine speed, from a first-selected engine speed to a second-selected engine speed, by predicting throttle position needed to provide said second-selected engine speed; providing a feed forward signal moving said throttle to the predicted throttle position; after said movement of said throttle to said predicted throttle position, using said engine, speed control system to maintain engine speed at said second-selected engine speed; responding to said operator changing said operator-selected engine speed, from said first-selected engine speed to said second-selected engine speed, by predicting throttle position needed to provide requisite engine airflow per cylinder, APC, needed to provide said second-selected engine speed; and using a normalized APC calculation to predict required throttle position to achieve said second-selected engine speed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A marine propulsion system with efficient changing of controlled engine speed of a marine internal combustion engine in a marine propulsion system for propelling, a marine vessel, wherein said engine is operated at an operator-selected engine speed and an engine speed control system maintains engine speed at said operator-selected engine speed, said engine having a throttle controlling engine speed according to throttle position,
said marine propulsion system with efficient changing of controlled engine speed comprising a control circuit having a processor, a memory, and an input/output interface, wherein the control circuit: -
responds to said operator changing said operator-selected engine speed, from a first-selected engine speed to a second-selected engine speed, by predicting throttle position needed to provide said second-selected engine speed; provides a feed forward signal moving said throttle to the predicted throttle position; after said movement of said throttle to said predicted throttle position, uses said engine speed control system to maintain engine speed at said second-selected engine speed; responds to said operator changing said operator-selected engine speed, from said first-selected engine speed to said second-selected engine speed, by predicting throttle position needed to provide requisite engine airflow per cylinder, APC, needed to provide said second-selected engine speed; and uses a normalized APC calculation to predict required throttle position to achieve said second-selected engine speed. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transient computer-readable medium having computer-executable instructions for performing a method for changing controlled engine speed of a marine internal combustion engine in a marine propulsion system for propelling a marine vessel, wherein said engine is operated at art operator-selected engine speed and an engine speed control system maintains engine speed at said operator-selected engine speed, said engine having a throttle controlling engine speed according to throttle position,
said method comprising: -
responding to said operator changing said operator-selected engine speed, from a first-selected engine speed to a second-selected engine speed, by predicting throttle position needed to provide said second-selected engine speed; providing a feed forward signal moving said throttle to the predicted throttle position; after said movement of said throttle to said predicted throttle position, using said engine speed control system to maintain engine speed at said second-selected engine speed; responding to said operator changing said operator-selected engine speed, from said first-selected engine speed to said second-selected engine speed, by predicting throttle position needed to provide requisite engine airflow per cylinder, APC, needed to provide said second-selected engine speed; and using a normalized APC calculation to predict required throttle position to achieve said second-selected engine speed. - View Dependent Claims (16)
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Specification