Engine knock control apparatus

Details Engine knock control apparatus Engine knock control apparatus

1981-08-06

1984-01-17

Lall, P. S.

Internal-combustion engines

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

73 35, F02P 504

Patent

active

044258917

ABSTRACT:
The output of a knock sensor for detecting a knock signal of an engine is applied to a bandpass filter for bandpassing only the knock signal. The output of the bandpass filter is applied to an automatic gain control circuit for variably controlling the gain of the knock signal. The output of the automatic gain control circuit is applied to an averaging circuit via a maximum clamp circuit. A comparator supplies an output to an integration circuit of the next stage when the output of the bandpass filter becomes greater than that of the averaging circuit. An ignition control device for controlling the spark timing of an ignition coil energizes the ignition coil by the output from a pick-up coil and that of the integration circuit and delivers a feedback signal to the integration circuit.

REFERENCES:
patent: 4012942 (1977-03-01), Harned
patent: 4153020 (1979-05-01), King et al.
patent: 4312214 (1982-01-01), Kramer et al.
patent: 4329970 (1982-05-01), Mowery
patent: 4333334 (1982-06-01), Nakajima et al.
patent: 4343278 (1982-08-01), Asano
patent: 4354378 (1982-10-01), Oshiage et al.

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