Misfire detection dependent on intake air charge fluctuations
First Claim
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1. A misfire detection method for an engine comprising:
- measuring fluctuations of air charge ingested into the engine; and
providing a misfire indication dependent on the measured fluctuations of air charge.
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Abstract
A misfire detection system and method measures fluctuations of air charge ingested into an engine 303, preferably as fluctuations of the engine'"'"'s intake air pressure or as fluctuations of the mass air flow. A misfire indication 337 is provided dependent on a behavior of the fluctuations of air charge. Preferably, to eliminate errors associated with engine transient operating conditions, such as acceleration, the fluctuations of air charge are differentiated 325 before a misfire detection mechanism 333 is used to determine misfire behavior.
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Citations
18 Claims
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1. A misfire detection method for an engine comprising:
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measuring fluctuations of air charge ingested into the engine; and providing a misfire indication dependent on the measured fluctuations of air charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A misfire detection method for an engine comprising:
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measuring engine crankshaft angular position; providing a measure of intake air pressure scheduled in cooperation with the measured engine crankshaft angular position; differentiating the measure of intake air pressure into differentiated intake air signal; and providing a misfire indication dependent on the differentiated intake air signal. - View Dependent Claims (11, 12, 13)
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14. A misfire detection system for an engine comprising:
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a sensor coupled to the engine for providing measuring fluctuations of air charge ingested into the engine; and a signal processor for providing a misfire indication dependent on a magnitude of the fluctuations of air charge ingested into the engine. - View Dependent Claims (15, 16, 17, 18)
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Specification