Patent ID: 6415656
Filing Date: 2002-07-09
Classification: F02D,G01M,Y02T

Abstract:
A method for detecting misfire in an internal combustion engine of a vehicle, the method comprising:determining displacement of the engine; determining torque of the engine; calculating an indicated mean effective pressure (IMEP) parameter for the engine, wherein the indicated mean effective pressure (IMEP) parameter is engine torque divided by engine displacement; determining maximum indicated mean effective pressure (IMEP_MAX) parameter for the engine; calculating a normalized indicated mean effective pressure (IMEP_LOAD) parameter for the engine, wherein the normalized indicated mean effective pressure (IMEP_LOAD) parameter is the indicated mean effective pressure (IMEP) parameter divided by the maximum indicated mean effective pressure (IMEP_MAX) parameter; and monitoring the indicated mean effective pressure (IMEP) parameter to detect misfire.