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Systems and methods for controlling a rotational speed of a marine internal combustion engine

  • US 9,556,806 B1
  • Filed: 12/18/2014
  • Issued: 01/31/2017
  • Est. Priority Date: 05/16/2014
  • Status: Active Grant
First Claim
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1. A system for controlling a rotational speed of an internal combustion engine of a marine propulsion device coupled to a marine vessel, the system comprising:

  • a first operator input device for controlling the engine speed in a trolling mode, such that the engine operates at a first operator-selected engine speed and propels the marine vessel at a first non-zero speed;

    a second operator input device for controlling the engine speed in a non-trolling mode, such that the engine operates at a second operator-selected engine speed and propels the marine vessel at a second non-zero speed; and

    a controller in signal communication with the first operator input device, the second operator input device, and the engine;

    wherein, in response to an operator request to transition from the trolling mode to the non-trolling mode, the controller determines whether to allow the transition based on a comparison of the second operator-selected engine speed with a current, measured engine speed and thereafter operates the marine propulsion device in the trolling mode or the non-trolling mode, as appropriate, based on the determination;

    wherein the controller allows the transition from the trolling mode to the non-trolling mode if the second operator-selected engine speed is greater than the current engine speed and if the controller receives an input from the second operator input device that exceeds a predetermined threshold.

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