Engine misfire detection system and method

Details Engine misfire detection system and method Engine misfire detection system and method

1994-07-12

1996-06-25

Chilcot, Richard

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

055289304

ABSTRACT:
An engine misfire detection system and method for successfully detecting and identifying misfiring engine cylinders over varying engine cycle rates and under varying engine load conditions in real time are embodied in a manifold absolute pressure sensor, an engine position (CID) sensor, a misfire sensor and misfire detection system electronics. The system utilizes empirical misfire signal signatures of misfire sensor signal range values over different engine cycle rates and under varying engine load conditions to detect a misfire condition. The system further utilizes an index ratio, which is determined from a number of samples of the misfire sensor signal taken during an engine cycle and from the engine's rate of operation, to identify which cylinder of the engine has misfired.

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