Device for detecting knocking in an internal combustion engine

Details Device for detecting knocking in an internal combustion engine Device for detecting knocking in an internal combustion engine

1997-09-17

2000-04-25

Ballato, Josie

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Apparatus for coupling a measuring instrument to an ignition...

73 3508, F02P 1700, G01L 2322

Patent

active

060548606

ABSTRACT:
A device for detecting knocking in an internal combustion engine capable of preventing accuracy for detecting knocking from being deteriorated by noise when resetting the LC resonance masking unit. An ionic current signal detected by an ionic current detecting unit is supplied to a buffer amplifier 5 via an LC resonance masking unit 31. To a first operational amplifier 51 of the buffer amplifier is connected a capacitor 513 for rejecting noise in parallel with a first feedback resistor 512. A second operational amplifier inverts again the ionic current signal inverted by the first operational amplifier. The buffer amplifier prevents a stepwise change on the input to the band-pass filtering unit when the masking of the LC resonance masking unit is reset, and suppresses a reduction in accuracy for detecting the knocking.

REFERENCES:
patent: 4364260 (1982-12-01), Chen
patent: 4922883 (1990-05-01), Iwasaki
patent: 5109820 (1992-05-01), Iwata et al.
patent: 5287837 (1994-02-01), Hashimoto et al.
patent: 5425339 (1995-06-01), Fukui
patent: 5652520 (1997-07-01), Kawamoto
patent: 5836285 (1998-11-01), Aoki et al.
patent: 5900536 (1999-05-01), Mogi et al.

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