Marine propulsion system with efficient engine speed delta

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.

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.