Knock detecting device for internal combustion engine

Details Knock detecting device for internal combustion engine Knock detecting device for internal combustion engine

1998-04-24

1999-09-28

Oda, Christine K.

Measuring and testing

Engine detonation

Specific type of detonation sensor

73 3507, 73115, G01M 1500

Patent

active

059591927

ABSTRACT:
A knock detection device for an internal combustion engine prevents erroneous knock detection decisions from being made due to an LC resonant current in an ion current path. An LC resonance frequency, which is determined based on an inductance of ignition coil secondary and a stray capacitance formed in the ion current path, is set so as to be displaced from a knock frequency so that the knock frequency component alone can be detected accurately from the ion current output. Preferably, the inductance of the ignition coil secondary is set to a large value, thereby setting the LC resonance frequency lower than the knock frequency and thus improving ignitability as well as knock detectability. Also preferably, the LC resonance frequency is set to a value lower than a lower cut-off frequency of a knock signal extraction band-pass filter provided in a processing circuit. This ensures more reliable elimination of the noise causing LC resonance frequency component.

REFERENCES:
patent: 4232545 (1980-11-01), Dobler
patent: 4444172 (1984-04-01), Sellmaier et al.
patent: 4648367 (1987-03-01), Gillbrand et al.
patent: 5675072 (1997-10-01), Yasuda
Automotive Engineering, Sep., 1995, "Ion-gap Sensing for Engine Control".
U.S. application No. 08/932,599, Aoki, filed Sep. 17, 1997.
U.S. application No. 08/923,744, Aoki, filed Sep. 2, 1997.
U.S. application No. 08/923,163, Aoki, filed Sep. 4, 1997.
U.S. application No. 08/918,384, Aoki, filed Aug. 26, 1997.

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