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Ignition timing control for marine engine

  • US 6,109,235 A
  • Filed: 07/31/1998
  • Issued: 08/29/2000
  • Est. Priority Date: 07/31/1997
  • Status: Expired due to Term
First Claim
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1. A method of controlling ignition firing timing of an ignition element associated with an engine, the engine including an intake system having at least one throttle valve and a cooling system containing coolant, the method involving sensing coolant temperature and an opening degree of the throttle valve, determining engine speed, determining ignition timing based upon the determined engine speed and the sensed throttle valve opening degree, detecting a low-temperature idle state of the engine based upon the sensed coolant temperature, and compensating the ignition timing by advancing or delaying the determined ignition timing while the engine is in the low temperature idle state such that the sensed engine speed generally matches a preset target engine speed corresponding to the sensed coolant temperature.

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