Method and system for detecting the misfire of a reciprocating i

Details Method and system for detecting the misfire of a reciprocating i Method and system for detecting the misfire of a reciprocating i

1993-02-26

1996-01-23

Teska, Kevin J.

Boots, shoes, and leggings

36443107, 36443105, 36443108, 73116, 731173, 73660, 123414, 123425, G06F 1900, F02P 500, G01L 326

Patent

active

054870089

ABSTRACT:
Engine misfire is detected in a reciprocating internal combustion engine having an engine cycle frequency in the frequency domain from crankshaft angular velocity. Crankshaft angular position is sensed to develop an electrical signal which is a function of the crankshaft angular velocity. The electrical signal contains data which is sampled. The sampled data is transformed to an equivalent frequency domain spectrum including frequency components of the engine cycle frequency and harmonics thereof. A statistical decision algorithm is applied to the magnitudes of the frequency components to distinguish between a true misfire and normal cyclic variability which characterizes the combustion process. In one embodiment, the misfired cylinder is identified based on the phase of the frequency component at the engine cycle frequency. In another embodiment, the identity of the misfired cylinder is determined by shifting the sampled data prior to transforming the data.

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