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Detecting malfunction in cylinders of internal combustion engines

  • US 3,972,230 A
  • Filed: 06/19/1975
  • Issued: 08/03/1976
  • Est. Priority Date: 06/19/1975
  • Status: Expired due to Term
First Claim
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1. Apparatus to detect malfunctioning in individual cylinders of an internal combustion engine, comprising:

  • means for measuring the engine power time periods between crankshaft positions representing successive ignition times in successively fired cylinders of the engine,means to compute the individual deceleration rates between successive time periods,means to compute the average deceleration rate for each cylinder, andmeans to compare each individual deceleration rate with average deceleration rate for the corresponding cylinder, and to register a misfire when the individual deceleration rate exceeds the average by more than a predetermined limit value.

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