Ignition control system for an internal combustion engine

Details Ignition control system for an internal combustion engine Ignition control system for an internal combustion engine

1989-10-17

1990-08-28

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

123425, F02P 500

Patent

active

049516302

ABSTRACT:
An ignition control system for an internal combustion engine capable of determining appropriate ignition timing in an exact manner without employing a crank angle sensor so as to optimize the combustion of the mixture in the engine cylinders. To this end, a reference ignition timing is first determined based on the operating conditions (e.g., load condition) of the engine, and the internal pressure in the engine cylinder is sensed so that the state of combustion of a mixture in the engine cylinder is detected based on the engine cylinder internal pressure thus sensed. The reference ignition timing is then modified to provide an optimum ignition timing by an amount of modification which is calculated by using a peak point in time of the cylinder internal pressure at which a peak of combustion pressure in the engine cylinder takes place. A specific pressure in the engine cylinder which corresponds to the optimum ignition timing is calculated so that ignition is effected when the internal pressure in the engine cylinder as sensed becomes equal to the specific pressure thus calculated.

REFERENCES:
patent: 4531399 (1985-07-01), Aono
patent: 4745902 (1988-05-01), Yagi et al.
patent: 4825832 (1989-05-01), Satoh et al.
patent: 4838228 (1989-06-01), Yonoyama
patent: 4848299 (1989-07-01), Satoh et al.
patent: 4901699 (1990-02-01), Uniwa et al.

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