Ignition timing control apparatus

Details Ignition timing control apparatus Ignition timing control apparatus

1988-04-20

1989-06-13

Nelli, Raymond A.

Internal-combustion engines

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

123435, F02P 504

Patent

active

048382280

ABSTRACT:
An engine ignition timing control apparatus includes a control circuit for calculating an appropriate value for engine ignition timing. The control circuit determines a region where the engine is operating from a relationship programmed thereinto. The relationship defines a knock control unnecessary region at low engine speed or at low engine loads, a knock control necessary region at intermediate engine speeds and at high engine loads, and a knock control impossible region at high engine speeds and at high engine loads. The knock control necessary region is divided into a plurality of knock control necessary region segments. The control circuit calculates correction factors for the respective knock control necessary region segments based on knock intensity. The control circuit also calculates a feed-forward correction factor for the knock control impossible region based on the correction factors calculated for the respective knock control necessary region segments. The calculated ignition timing value is modified according to the correction factor calculated for the determined engine operating region.

REFERENCES:
patent: 4694800 (1987-09-01), Morita
patent: 4715342 (1987-12-01), Nagai
patent: 4726339 (1988-02-01), Nagai
patent: 4729358 (1988-03-01), Morita et al.
patent: 4736723 (1988-04-01), Nagai
patent: 4766545 (1988-08-01), Nagai

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