Engine misfire detection
First Claim
1. A method of detecting a malfunction of an engine, the engine having a rotating member and an angular position correlated with an angular orientation of the rotating member, the engine having an engine speed, the method comprising:
- determining the engine speed at a plurality of angular positions;
multiplying the engine speed by a sine function of the angular position to provide a first product;
passing the first product through a first low pass filter to produce a first output; and
detecting the malfunction of the engine using the first output.
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Abstract
A method of detecting an engine malfunction such as a misfire includes determining engine speed values at each of a plurality of measurement angular positions, heterodyning the engine speed values with sine and cosine functions indexed in the angular domain, passing the heterodyned results through a low pass filter, and computing the resulting magnitude from the resulting two vectors. An apparatus for detecting an engine malfunction, such as a misfire, includes an engine speed analyzer, a multiplier, and a low pass filter.
39 Citations
16 Claims
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1. A method of detecting a malfunction of an engine, the engine having a rotating member and an angular position correlated with an angular orientation of the rotating member, the engine having an engine speed, the method comprising:
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determining the engine speed at a plurality of angular positions; multiplying the engine speed by a sine function of the angular position to provide a first product; passing the first product through a first low pass filter to produce a first output; and detecting the malfunction of the engine using the first output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification