Apparatus for detecting misfire in internal combustion engine

Details Apparatus for detecting misfire in internal combustion engine Apparatus for detecting misfire in internal combustion engine

1995-04-27

1996-10-08

Wieder, Kenneth A.

Measuring and testing

Engine detonation

Specific type of detonation sensor

73 3501, 324399, 324464, F02P 1700, F02P 304

Patent

active

055633323

ABSTRACT:
An apparatus for detecting a misfire in an internal combustion engine arranged so that a leak current caused when the insulation of an ignition plug is compensated. An ion current and the leak current can easily be discriminated from each other, whereby the ion current detection accuracy can be improved. The apparatus is provided with a biasing capacitor which is charged with a current flowing at the time of discharge through the ignition plug, a Zener diode for setting the voltage at which the capacitor is charged by this charging, a first semiconductor integrated circuit which detects the charging current flowing through the capacitor and thereafter outputs a control current through a predetermined time period, and which holds a peak value of a voltage converted from the ion current and detects the ion current by comparing the converted voltage value of the ion current and the held peak value.

REFERENCES:
patent: 5424647 (1995-06-01), Ohsawa
patent: 5483818 (1996-01-01), Brandt

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