Internal combustion engine misfire circuit using ion current sen

Details Internal combustion engine misfire circuit using ion current sen Internal combustion engine misfire circuit using ion current sen

1995-11-07

1997-07-29

Nguyen, Vinh P.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Coil

324399, 324402, 73116, F02P 1700

Patent

active

056525206

ABSTRACT:
An internal combustion engine misfire sensing circuit comprises an ion current sensing circuit for sensing an ion current in the combustion chamber of an internal combustion engine, a current/voltage conversion circuit for converting the sensed ion current into a voltage and a waveform shaping circuit for shaping the waveform of an output of the current/voltage conversion circuit. The waveform shaping circuit includes a second comparator for comparing a voltage of a third capacitor with first and second reference voltages for outputting a misfire sensing signal and a capacitor charging/discharging circuit for charging the third capacitor in response to the rising up of an output of the current/voltage conversion circuit and discharging the third capacitor based on the input of the misfire sensing signal. With this arrangement a misfire can be sensed even in an internal combustion engine having multiple cylinders, the number of parts can be reduced as well as the area of circuits can be reduced.

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patent: 5563332 (1996-10-01), Yasuda

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