Device for detecting a state of combustion in an internal combus

Details Device for detecting a state of combustion in an internal combus Device for detecting a state of combustion in an internal combus

1997-09-04

1999-09-21

Williams, Hezron

Measuring and testing

Vehicle chassis

Steering

73 3508, G01M 1500

Patent

active

059556641

ABSTRACT:
A device for a detecting a combustion state in an internal combustion engine, capable of preventing the background from increasing while the fuel is being cut. A peak value of ionic current detected by the ionic current detecting unit 19 is supplied to an ignition timing control unit 14 via an LC resonance masking unit 31, a band-pass filter unit 32 and a peak-holding unit 33. An average of peak values is used as a background, and it is so determined that knocking has occurred when the peak value becomes larger than the product of a predetermined coefficient and the background (BG). Impulse noise (IM) easily occurs while the fuel is being cut. In order to prevent BG from being increased by IM, therefore, a limiting means is provided to limit BG to a value calculated before the fuel was cut, so that the detecting precision will not be deteriorated after the fuel-cut is terminated.

REFERENCES:
patent: 5146893 (1992-09-01), Ohsawa
patent: 5222393 (1993-06-01), Ohsawa
patent: 5563332 (1996-10-01), Yasuda

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