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Method and system for detecting the misfire of an internal combustion engine utilizing engine torque nonuniformity

  • US 5,278,760 A
  • Filed: 09/13/1991
  • Issued: 01/11/1994
  • Est. Priority Date: 04/20/1990
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a 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 angular velocity of said crankshaft to obtain an electrical signal representation thereof, said electrical signal containing data;

    filtering said data to minimize the effects of random error and disturbances in said electrical signal to obtain filtered data;

    calculating an M-dimensional torque nonuniformity vector derived from said filtered data;

    computing at least one reference value of torque based on said torque nonuniformity vector;

    estimating indicated torque provided by said at least one cylinder during a given engine cycle based upon said crankshaft angular velocity; and

    comparing said at least one reference value with said indicated torque to obtain a misfire signal.

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