Ignition timing control system for internal combustion engines

Details Ignition timing control system for internal combustion engines Ignition timing control system for internal combustion engines

1992-11-25

1993-08-17

Nelli, Raymond A.

Internal-combustion engines

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

F02P 514

Patent

active

052359530

ABSTRACT:
An ignition timing control system for an internal combustion engine includes an ECU which calculates a knocking correction value in response to an output from a knocking sensor, and an advance limit value in response to engine operating conditions. The ECU operates to limit correction of the ignition timing of the engine in an advancing direction, beyond the advance limit value when the knocking correction value exceeds the advance limit value. The ECU carries out the advance correction limitation when the engine load exceeds a first predetermined value. Further, the ECU sets a predetermined reference value more advanced than the advance limit value, in response to engine operating conditions. and when the engine load exceeds a second predetermined value, it modifies the knocking correction value in the ignition timing-advancing direction toward the predetermined reference value and cancels the advance correction limitation when the knocking correction value has been modified to the predetermined reference value while knocking is not detected.

REFERENCES:
patent: 5090382 (1992-02-01), Bolander et al.
patent: 5101790 (1992-04-01), Takasu et al.
patent: 5107813 (1992-04-01), Inoue et al.
patent: 5134980 (1992-08-01), Sakakibara et al.
patent: 5144929 (1992-09-01), Hosoya et al.
patent: 5165378 (1992-11-01), Miyashita
patent: 5170762 (1992-12-01), Tsutumi et al.
patent: 5186145 (1993-02-01), Sakakibara

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