Preignition detecting system

Details Preignition detecting system Preignition detecting system

1996-03-21

1997-05-27

Nelli, Raymond A.

Internal-combustion engines

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

F02P 514

Patent

active

056322470

ABSTRACT:
A preignition detecting system capable of detecting a preigniting condition (PI) at an early time. Vibration of an internal combustion engine is detected by a vibration sensor 113, and is fetched by a controller 12. The crank angle is detected by a crank angle sensor 111. It is so determined that PI has occurred when a difference between the ignition timing and the crank angle at which the vibration level exceeds a predetermined level becomes smaller than a predetermined value. It is further determined that the PI is occurring when the vibration level continues to increase despite the ignition timing being delayed continuously, enabling the occurrence of PI to be detected quickly and reliably. Furthermore, the constitution is simplified by installing a first gate that opens after the passage of a short period of time from the ignition timing and a second gate that opens thereafter.

REFERENCES:
patent: 5388560 (1995-02-01), Hisaki et al.
patent: 5411000 (1995-05-01), Miyashita et al.
patent: 5421304 (1995-06-01), Gibtner et al.
patent: 5426587 (1995-06-01), Imai et al.

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