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Method and system for detecting the misfire of an internal combustion engine utilizing angular velocity fluctuations

  • US 5,200,899 A
  • Filed: 04/20/1990
  • Issued: 04/06/1993
  • Est. Priority Date: 04/20/1990
  • Status: Expired due to Fees
First Claim
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1. A method for detecting the misfire of a reciprocating internal combustion engine having a plurality of reciprocating components, at least one cylinder and a crankshaft, the method comprising the steps of:

  • measuring the angular velocity of the crankshaft to obtain an electrical signal representation thereof;

    filtering the electrical signal to minimize the effects of random error and disturbances in the electrical signal to obtain a filtered angular velocity signal;

    calculating an M-dimensional torque nonuniformity vector derived from the filtered angular velocity signal, where M is proportional to the number of cylinders of the engine; and

    applying a statistical decision algorithm to the torque nonuniformity vector, which algorithm statistically distinguishes between a true misfire and normal cyclic variability which characterizes the combustion process in each cylinder of the engine, to thereby obtain a misfire signal.

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