Knock detecting apparatus for internal combusion engines

Details Knock detecting apparatus for internal combusion engines Knock detecting apparatus for internal combusion engines

1982-08-17

1984-10-16

Birmiel, Howard A.

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

G01L 2322

Patent

active

044767099

ABSTRACT:
In a knock detecting apparatus for an internal combustion engine, the output signal of a knock sensor whose output signal level varies in accordance with the engine conditions, engine speed, sensor sensitivity, etc., is passed through an automatic gain control circuit (AGC) thereby stabilizing the output level. The background noise level derived by integrating the output signal and the stabilized output signal are compared to detect the occurrence of knocking. The stabilized output signal is passed through a low-pass filter or a band-pass filter and the resulting control signal is used to control the gain of the AGC circuit.

REFERENCES:
patent: 4111035 (1978-09-01), West et al.
patent: 4153020 (1979-05-01), King et al.
patent: 4312214 (1982-01-01), Kramer et al.
patent: 4333334 (1982-06-01), Nakajima et al.

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