Ion current detection device for internal combustion engine

Details Ion current detection device for internal combustion engine Ion current detection device for internal combustion engine

1997-07-14

2000-01-04

Ballato, Josie

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Coil

324399, 73 3508, F02P 1700

Patent

active

060113979

ABSTRACT:
An ion current detection device of an internal combustion engine includes a detection voltage generation device which applies a voltage to an ignition plug to generate an ion current in a cylinder of the engine. A current to voltage conversion circuit detects and converts the generated ion current to a voltage signal. A bandpass filter extracts an ac component within a specified frequency range from the voltage signal produced by the current to voltage conversion circuit. An ion current threshold detection portion produces an ion current detection signal when the detected ion current exceeds a predetermined threshold current. A filter characteristic control circuit controls the characteristic of the bandpass filter to suppress the sensitivity of the filter for a predetermined period of time right after the ion current detection signal is detected and, after the predetermined period of time, increase the sensitivity of the filter for detection of the ac signal with the specific frequency.

REFERENCES:
patent: 4382233 (1983-05-01), Hofer
patent: 5548220 (1996-08-01), Kawamoto et al.
patent: 5561239 (1996-10-01), Yasuda
patent: 5652520 (1997-07-01), Kawamoto et al.
patent: 5675072 (1997-10-01), Yasuda et al.

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