×

Misfire detection in an internal combustion engine

  • US 5,044,195 A
  • Filed: 08/24/1990
  • Issued: 09/03/1991
  • Est. Priority Date: 08/24/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of detecting misfires of individual cylinder firings in a combustion engine, said method comprising the steps of:

  • measuring engine acceleration corresponding to each of a plurality of cylinder firings during operation of said engine;

    selecting one of said cylinder firings for detection;

    determining an average acceleration over a series of said cylinder firings substantially centered on said selected cylinder firing;

    determining deviation of acceleration of said selected cylinder firing from said average acceleration;

    normalizing said deviation to a torque-related value coinciding with said selected cylinder firing;

    comparing said normalized deviation with a predetermined threshold; and

    detecting a misfire of said selected cylinder firing depending on the result of said comparing step.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×