Knock control with AGC having reduced knock dependence

Details Knock control with AGC having reduced knock dependence Knock control with AGC having reduced knock dependence

1986-04-14

1987-02-24

Dolinar, Andrew M.

Internal-combustion engines

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

73 35, F02P 5145

Patent

active

046449183

ABSTRACT:
A knock control for a spark ignited, internal combustion engine including an AGC amplifier in which the amplified sensor signal is demodulated, processed and compared to a fixed reference level to generate a pulsed knock signal. An error signal is generated from the difference between the signal input to the comparator and a desired signal voltage level; and the error signal is integrated to create the AGC control signal. The integration rate is decreased during each knock indicating pulse of the pulsed knock signal output of the comparator to reduce the effect of knock on the AGC control voltage and thus stabilize the AGC control. In particular, the error signal is a current level signal; and the input to the integrator includes a series impedance with a bypassing switch controlled by the comparator output to force the input through the impedance only during knock indicating pulses.

REFERENCES:
patent: 4153020 (1979-05-01), King et al.
patent: 4312214 (1982-01-01), Kramer et al.
patent: 4384473 (1983-05-01), Brandt
patent: 4425891 (1984-01-01), Kashimura et al.
patent: 4463722 (1984-08-01), Kobayashi
patent: 4476709 (1984-10-01), Hattori et al.
patent: 4481924 (1984-11-01), Kobayashi
patent: 4528955 (1985-07-01), Sugiura

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