Misfire detection device for an internal combustion engine

Details Misfire detection device for an internal combustion engine Misfire detection device for an internal combustion engine

1991-11-26

1993-11-02

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

G01M 1500

Patent

active

052575330

ABSTRACT:
A misfire detection device for an internal combustion engine determines the pulse width T.sub.1 and the low level interval T.sub.2 of a rotation signal Sc generated by a rotation signal sensor. The rising and falling edges of the pulses of the rotation signal Sc corresponds to predetermined reference angular positions of respective cylinders. The ratio T.sub.2 /T.sub.1 or T.sub.2 /(T.sub.1 +T.sub.2) is calculated and an occurrence of misfire is detected when the ratio exceeds a predetermined reference level.

REFERENCES:
patent: 4967727 (1990-11-01), Takahashi et al.

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