Knock suppressing apparatus and method

Details Knock suppressing apparatus and method Knock suppressing apparatus and method

1991-08-23

1993-04-27

Dolinar, Andrew M.

Internal-combustion engines

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

73 35, F02P 5145, G01L 2322

Patent

active

052052583

ABSTRACT:
A knock suppressing apparatus for an internal combustion engine includes an amplifier that amplifies the output signal of a knock sensor for sensing engine vibrations. A vibration level signal and a threshold signal are generated based on the amplifier output signals, and knocking is detected by comparing the vibration level signal and the threshold signal. The gain of the amplifier is varied in accordance with an operating condition indicative of the noise level of the engine so as to maintain the vibration level signal and the threshold signal within prescribed ranges suitable for knock determination. In one form of the invention, when the amplifier gain is varied, the threshold signal is also varied at substantially the same time and by substantially the same percentage as the amplifier gain.

REFERENCES:
patent: 4312214 (1982-01-01), Kramer et al.
patent: 4425891 (1984-01-01), Kashimura et al.
patent: 4463722 (1984-08-01), Kobayashi
patent: 4766545 (1988-08-01), Nagai
patent: 4887456 (1989-12-01), Cockerham et al.
patent: 5109820 (1992-05-01), Iwata et al.

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