Knock control system

Details Knock control system Knock control system

1983-01-17

1985-07-16

Cox, Ronald B.

Internal-combustion engines

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

73 35, F02P 504

Patent

active

045289557

ABSTRACT:
A gain control system comprising a gain variable amplifier for amplifying an input signal linearly, a gain control circuit for producing a gain control signal for controlling the gain of the amplifier on the basis of an output signal of the amplifier, and a gain control signal controller for controlling the gain control signal to prevent the gain of the gain variable amplifier from changing abruptly. A signal for controlling the ignition timing is produced by a comparison of a background level of engine noise with the output of a knock sensor. The background level signal is produced by a first integration circuit having a time constant of T.sub.1. The gain of the output signal from the knock sensor is controlled by an output signal from the background level sensor which is integrated by a second integration circuit having a time constant of T.sub.2 in which T.sub.2 >T.sub.1.

REFERENCES:
patent: 4116175 (1978-09-01), Sand
patent: 4279143 (1981-07-01), Guipaud
patent: 4351282 (1982-09-01), Utsumi
patent: 4423621 (1984-01-01), Kenichi
patent: 4425891 (1984-01-01), Kashimura

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