Apparatus and method for recognizing misfire occurrence in multi

Details Apparatus and method for recognizing misfire occurrence in multi Apparatus and method for recognizing misfire occurrence in multi

1996-03-22

1997-09-23

Dombroske, George M.

Measuring and testing

Test stand

For engine

731173, 123419, 123436, 36443107, F02P 1700, G01M 1500

Patent

active

056707134

ABSTRACT:
Apparatus and method for recognizing an absence or presence of a misfire in each of cylinders of a multi-cylinder internal combustion engine without influences of a mechanical deviation in a crank angle sensor and of a combustion state deviation between each of the cylinders. A period of each reference signal (REF) is generated from the crank angle sensor and a fuel combustion state deviation between each of the cylinders. The period of each reference signal (REF), which is generated from the crank angle sensor whenever an engine crankshaft has rotated through a predetermined crank angle expressed as 720.degree.
(n denotes a number of engine cylinders), is measured by a timer. A determination of the absence or presence of the misfire in each cylinder is made based on the measured period of the reference signal for each corresponding one of the cylinders. The measured period being corrected with either or both of first and second correction coefficients (KT.sub.i KKT.sub.i) derived by learning the corresponding first correction coefficient for the mechanical deviation and by learning the corresponding second correction coefficient for the combustion state deviation.

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