Remote control system of an internal combustion engine for a boat

A control system for internal combustion engines in a boat equipped with a plurality of propulsion units, the control system comprising:

• a plurality of electronic control devices on an internal combustion engine side of each internal combustion engine, each of the plurality of electronic control devices programmed to control an operation of a throttle actuator of the internal combustion engine, an operation of a shift actuator, and an ignition timing of a spark plug of the boat;
• and
• a remote control device comprising a plurality electronic control devices, which communicate with each other, on a remote control device side corresponding in number to the plurality of electronic control devices on the internal combustion engine side and programmed to transmit a signal to each internal combustion engine to execute a target drive state;
• wherein
• when an abnormality in an internal combustion engine in a propulsion unit occurs, an electronic control device on the internal combustion engine side connected to the abnormal internal combustion engine detects the abnormality and outputs an abnormal signal transmitting a target throttle opening angle signal to the throttle actuator to set a throttle opening angle of the abnormal internal combustion engine to a predetermined opening angle;
• the abnormal signal is transmitted to an electronic control device on the remote control device side of a normal internal combustion engine via an electronic control device on the remote control device side of the abnormal internal combustion engine;
• and
• the electronic control device on the remote control device side of the normal internal combustion engine, on receiving the abnormal signal, transmits the target throttle opening angle signal or the abnormal signal to the electronic control device on the internal combustion engine side of the normal internal combustion engine such that an engine speed of the abnormal internal combustion engine and the normal internal combustion engine are reduced.