System and method for controlling an ignition timing for an inte

Details System and method for controlling an ignition timing for an inte System and method for controlling an ignition timing for an inte

1988-04-19

1989-05-02

Nelli, Raymond A.

Internal-combustion engines

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

123417, 123435, F02P 514

Patent

active

048258326

ABSTRACT:
A system and method for controlling an ignition timing for an internal combustion engine, in which one of knock suppression correction quantity and MBT (Maximum Spark Advance for Best Torque) correction quantity whose value is placed at a more retardation angle side is selected as the ignition timing correction quantity, the ignition timing angle correction quantity is compared with the knock suppression quantity when a magnitude of the engine knocking exceeds a predetermined level. When the knock suppression correction quantity is placed at a more advance angle side than the ignition timing correction quantity, a basic ignition timing angle determined on the basis of an engine operating condition is corrected on the basis of a value of the ignition timing correction quantity corrected toward the retardation angle side by a predetermined angle. When the knock suppression correction quantity is not placed at the more advance angle side, the basic ignition timing angle is corrected on the basis of the knock suppression correction quantity.

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