Abstract: An improved marine engine control methodology is utilized in either single or twin engine applications, and provides a safe and logical transitioning between manual and automatic operating modes. A standard software instruction set is installed in a microprocessor-based engine control module for each engine, and a discrete input informs the control module if the respective engine is a master engine or a slave engine. In single engine applications, the engine is identified as a master engine, while in twin engine applications, one of the engines is identified as a master engine, and the other as a slave engine. The control software provides an operator activated speed control function for a master engine, and an operator activated sync control function for a slave engine. Each engine has an operator manipulated throttle lever for controlling the respective engine throttle position during the manual operating mode, and for defining a limit throttle position during the automatic operating modes.

Abstract: A recirculating driver control circuit for an electrically operated device has a power supply and a controller coupled to the power supply and the device. The controller generates an on/off signal through a first output. The on/off signal has an ON state and an OFF state. The controller generates a pulse width modulated signal through a second output. The pulse width modulated signal has a first state and a second state. A first switching device is coupled to the first output of the controller and the device and receives the on/off signal. The first switching device conducts when the on/off signal is in the ON state. A second switching device is coupled to the second output of the controller and the electrical device. Energy is supplied to the device when the pulse width modulated signal is in the first state and the on/off signal is in the ON state. The device recirculates energy to power supply when the pulse width modulated signal is in the second state and the on/off signal is in the ON state.