Knocking control method and apparatus for internal combustion en

Details Knocking control method and apparatus for internal combustion en Knocking control method and apparatus for internal combustion en

1991-10-01

1993-03-02

Nelli, Raymond A.

Internal-combustion engines

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

123419, F02P 514

Patent

active

051900114

ABSTRACT:
A method and an apparatus for suppressing knocking in an internal combustion engine are disclosed therein. Vibrations of the engine are detected periodically by a knocking sensor installed on the engine. Decision is made as to whether or not the vibration level as detected exceeds a predetermined value. In dependence on the result of the decision, the vibration level is averaged with a first or a second significance ratio which differ from each other and which are previously determined in consideration of variations in the vibration level brought about by degradation of the knocking sensor in the course of time lapse or by an engine operating state. A mean value obtained through the averaging processing is utilized as a basis for determining a threshold level for comparison with the vibration level for making decision as to the occurence of knocking. Upon detection of knocking, a retarded ignition control signal for retarding the ignition timing of the engine is generated to thereby suppress the occurrence of knocking. Because the threshold level reflects variations in the vibration level over time or variations in the engine operating state, knocking can be identified with improved reliability. Major portions of the apparatus can be implemented by using a microprocessor, whereby hardware requirement and expenditure can be mitigated significantly.

REFERENCES:
patent: 4951630 (1990-08-01), Iwata
patent: 4971007 (1990-11-01), Gopp et al.
patent: 5000149 (1991-03-01), Miyama
patent: 5069183 (1991-12-01), Nagano et al.
patent: 5090383 (1992-02-01), Demizu et al.

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