Ignition timing control for marine engine

Details Ignition timing control for marine engine Ignition timing control for marine engine

1998-07-31

2000-08-29

Kwon, John

Internal-combustion engines

Engine speed regulator

Idle speed control

12340653, 12340655, F02M 300

Patent

active

061092355

ABSTRACT:
The present invention is an ignition control system controlling ignition firing timing of an ignition element associated with an engine. The engine includes an output shaft powering a water propulsion device, an intake system including a throttle valve, and a sensor providing an output signal corresponding to each revolution of the output shaft. The ignition control system calculates a base ignition firing timing from a time between successive previous output signals, and determines if a low-temperature idle condition of engine exists from the sensed throttle angle and coolant temperature. If such condition exists, the ignition control system also determines a compensation value to compensate ignition timing to either the advance or delay side to generally match a target engine speed for a given coolant temperature, and modifies the basic ignition firing timing by the compensation value.

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