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Engine misfire detector

  • US 5,581,022 A
  • Filed: 06/15/1995
  • Issued: 12/03/1996
  • Est. Priority Date: 06/15/1995
  • Status: Expired due to Fees
First Claim
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1. A system for determining the occurrence of a misfire in an internal combustion engine including oscillating means for producing an oscillating signal, means coupled to the oscillating means for comparing an engine ignition timing signal with the oscillating signal and for generating a phase error signal from the comparison, means coupled to the means for comparing for producing a tracking signal which tracks changes in engine speed, the oscillating means being coupled to the means for producing the tracking signal and responsive to the tracking signal therefrom for generating the oscillating signal whose frequency changes in relation to changes in the tracking signal, said means for comparing being connected to said means for producing the oscillating signal for comparing the oscillating signal to the engine ignition timing signal, and means coupled to the means for comparing for receiving said error signal and responsive to changes in the error signal indicative of engine cylinder misfire and non-responsive to changes in the error signal associated with normal engine operation and for producing a cylinder misfire signal.

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