Marine propulsion system with efficient engine speed delta
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B63C-011/00
B63C-011/42
B63H-021/20
B63H-020/14
출원번호
US-0588473
(2012-08-17)
등록번호
US-8762022
(2014-06-24)
발명자
/ 주소
Arbuckle, Jason S.
Snyder, Matthew W.
Kirchhoff, Thomas S.
출원인 / 주소
Brunswick Corporation
대리인 / 주소
Andrus Intellectual Property Law, LLP
인용정보
피인용 횟수 :
22인용 특허 :
38
초록▼
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 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.
대표청구항▼
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-select
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; andusing a normalized APC calculation to predict required throttle position to achieve said second-selected engine speed. 2. The method according to claim 1 wherein said engine speed control system moves said throttle, in response to said operator changing said operator-selected engine speed from said first-selected engine speed to said second-selected engine speed, to attempt to set engine speed at said second-selected engine speed, and comprising: moving said throttle to said predicted throttle position in response to said feed forward signal, without waiting for said engine speed control system to move said throttle. 3. The method according to claim 2 wherein said engine speed control system is subject to overshoot when attempting, to set engine speed at said second-selected engine speed in response to said operator changing said operator-selected engine speed from said first-selected engine speed to said second-selected engine speed, and comprising: moving said throttle to said predicted throttle position in response to said feed forward signal without said overshoot otherwise caused by said engine speed control system. 4. The method according to claim 2 wherein said engine speed control system includes at least one PID controller, and comprising: reducing the amplification gain of said PID controller otherwise needed to accommodate said change from said first-selected engine speed to said second-selected engine speed, and instead accommodating said change by said predicted throttle position provided by said feed forward signal, whereby said PID controller amplification gain need only be large enough to maintain said engine speed at said second-selected engine speed, without having to accommodate the change from said first-selected engine speed to said second-selected engine speed, said reduced amplification gain providing enhanced stability of said PID controller. 5. The method according to claim 1 comprising using a normalized APC calculation as follows: (normalizedAPC)=K(correctedAPC)-(minimumAPC)(maximumAPC)-(minimumAPC)where K is a normalization function, and minimum APC and maximum APC are predetermined according to the particular said marine internal combustion engine in said marine propulsion system. 6. The method according to claim 1 comprising: predicting engine load at said second-selected engine speed;converting said predicted engine load to a predicted APC;calculating a corrected APC by compensating said predicted APC for a given parameter; andcalculating said normalized APC from said corrected APC. 7. The method according to claim 1 wherein said engine speed control system moves said throttle, in response to said operator changing said operator-selected engine speed from said first-selected engine speed to said second-selected engine speed, to attempt to set engine speed at said second-selected engine speed, and comprising: moving, said throttle to said predicted throttle position in response to said feed forward signal, without waiting for said engine speed control system to move said throttle;wherein said engine speed control system includes at least one PID controller, and comprising:reducing the amplification gain of said PID controller otherwise needed to accommodate said change from said first-selected engine speed to said second-selected engine speed, and instead accommodating said change by said predicted throttle position provided by said feed forward signal, whereby said PID controller amplification gain need only be large enough to maintain said engine speed at said second-selected engine speed, without having to accommodate the change from said first-selected engine speed to said second-selected engine speed, said reduced amplification gain providing enhanced stability of said PID controller;predicting engine load at said second-selected engine speed;converting said predicted engine load to a predicted APC;calculating a corrected APC by compensating said predicted APC for barometric pressure; andcalculating said normalized APC from said corrected APC. 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; anduses a normalized APC calculation to predict required throttle position to achieve said second-selected engine speed. 9. The marine propulsion system according to claim 8 wherein said engine speed control system moves said throttle, in response to said operator changing said operator-selected engine speed from said first-selected engine speed to said second-selected engine speed, to attempt to set engine speed at said second-selected engine speed, wherein said control circuit moves said throttle to said predicted throttle position in response to said feed forward signal, without waiting for said engine speed control system to move said throttle. 10. The marine propulsion system according to claim 9 wherein said engine speed control system is subject to overshoot when attempting to set engine speed at said second-selected engine speed in response to said operator changing said operator-selected engine speed from said first-selected engine speed to said second-selected engine speed, wherein said control circuit moves said throttle to said predicted throttle position in response to said teed forward signal without said overshoot otherwise caused by said engine speed control system. 11. The marine propulsion system according to claim 9 wherein said engine speed control system includes at least one PID controller, wherein said control circuit reduces the amplification gain of said PID controller otherwise needed to accommodate said change from said first-selected engine speed to said second-selected engine speed, and instead accommodates said change by said predicted throttle position provided by said feed forward signal, whereby said PID controller amplification gain need only be large enough to maintain said engine speed at said second-selected engine speed, without having to accommodate the change from said first-selected engine speed to said second-selected engine speed, said reduced amplification gain providing enhanced stability of said PID controller. 12. The marine propulsion system according to claim 8 wherein said control circuit uses a normalized APC calculation as follows (normalizedAPC)=K(correctedAPC)-(minimumAPC)(maximumAPC)-(minimumAPC)where K is a normalization function, and minimum APC and maximum APC are predetermined according to the particular said marine internal combustion engine in said marine propulsion system. 13. The marine propulsion system according to claim 8 wherein said control circuit: predicts engine load at said second-selected engine speed;converts said predicted engine load to a predicted APC;calculates a corrected APC by compensating said predicted APC for a given parameter; andcalculates said normalized APC from said corrected APC. 14. The marine propulsion system according to claim 8 wherein said engine speed control stem moves said throttle, in response to said operator changing said operator-selected engine speed from said first-selected engine speed to said second-selected engine speed, to attempt to set engine speed at said second-selected engine speed, said engine speed control system includes at least one PID controller, and wherein said control circuit: moves said throttle to said predicted throttle position in response to said feed forward signal, without waiting for said engine speed control system to move said throttle;reduces the amplification gain of said PID controller otherwise needed to accommodate said change from said first-selected engine speed to said second-selected engine speed, and instead, accommodates said change by said predicted throttle position provided by said feed forward signal, whereby said PID controller amplification gain need only be large enough to maintain said engine speed at said second-selected engine speed, without having to accommodate the change from said first-selected engine speed to said second-selected engine speed, said reduced amplification gain providing enhanced stability of said PID controller;predicts engine load at said second-selected engine speed;converts said predicted engine load to a predicted APC;calculates a corrected APC by compensating said predicted APC for barometric pressure; andcalculates said normalized APC from said corrected APC. 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; andusing a normalized APC calculation to predict required throttle position to achieve said second-selected engine speed. 16. The non-transient computer-readable medium having computer-executable instructions according to claim 15 wherein said engine speed control system moves said throttle, in response to said operator changing said operator-selected engine speed from said first-selected engine speed to said second-selected engine speed, to attempt to set engine speed at said second-selected engine speed, and wherein said method comprises: moving said throttle to said predicted throttle position in response to said feed forward signal, without waiting for said engine speed control system to move said throttle;wherein said engine speed control system includes at least one PID controller, and comprising:reducing the amplification gain of said PID controller otherwise needed to accommodate said change from said first-selected engine speed to said second-selected engine speed, and instead accommodating said change by said predicted throttle position provided by said feed forward signal, whereby said PID controller amplification gain need only be large enough to maintain said engine speed at said second-selected engine speed, without having to accommodate the change from said first-selected engine speed to said second-selected engine speed, said reduced amplification gain providing enhanced stability of said PID controller;predicting engine load at said second-selected engine speed;converting said predicted engine load to a predicted APC;calculating a corrected APC by compensating said predicted APC for barometric pressure; andcalculating said normalized APC from said corrected APC.
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