Engine ignition timing control apparatus

Details Engine ignition timing control apparatus Engine ignition timing control apparatus

1986-12-19

1988-03-01

Nelli, Raymond A.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

F02P 514

Patent

active

047278420

ABSTRACT:
An apparatus for controlling the timing of ignition of an internal combustion engine. The apparatus includes a cylinder pressure sensor sensitive to combustion pressure in a cylinder for providing a signal indicative of a sensed cylinder combustion pressure, and a control circuit responsive to the cylinder combustion pressure indicative signal for controlling the engine ignition timing. The control circuit measures a crankshaft angle at which the cylinder combustion pressure is at maximum. The control circuit retards the ignition timing when the measured crankshaft angle is less than a first value and advances the ignition timing when the measured crankshaft angle is greater than a second value greater than the first value. The control circuit retails the ignition timing to interrupt the feedback control of the ignition timing when the measured crankshaft angle is in a range defined by the first and second values. This is effective to eliminate a tendency toward unstable engine operation resulting from the conventional manner in which the ignition timing is re-adjusted at more frequent intervals than is required.

REFERENCES:
patent: 4552111 (1985-11-01), Tahara
patent: 4582032 (1986-04-01), Hara et al.
patent: 4631680 (1986-12-01), Korb et al.
patent: 4640249 (1987-02-01), Kawamura et al.
patent: 4655289 (1987-04-01), Morita
patent: 4660535 (1987-04-01), Asano
patent: 4676212 (1987-06-01), Kashimura et al.

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