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Method and device for detecting misfires of the air/fuel mixture feeding an internal combustion engine propelling a motor vehicle and their applications

  • US 5,452,699 A
  • Filed: 05/13/1994
  • Issued: 09/26/1995
  • Est. Priority Date: 10/16/1991
  • Status: Expired due to Term
First Claim
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1. A method for detecting misfires in an internal combustion engine propelling a motor vehicle, wherein the internal combustion engine is installed in a chassis of the motor vehicle, the method which comprises:

  • monitoring a dynamic behavior of an internal combustion engine of a motor vehicle for irregularities in the dynamic behavior;

    deducing that misfire has occured in the engine when irregularities in the dynamic behavior are detected;

    sensing a force transmitted between a chassis and the engine, determining an amplitude of the force, and defining a first condition in which the amplitude of the force exceeds a predetermined threshold amplitude;

    monitoring a load of the engine and defining a second condition in which the load of the engine is lower than a predetermined load value;

    prohibiting the deducing step if the first condition and the second condition are satisfied.

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