Misfire detecting apparatus using difference in engine rotation

Details Misfire detecting apparatus using difference in engine rotation Misfire detecting apparatus using difference in engine rotation

1996-10-09

1998-03-17

Dombroske, George M.

Measuring and testing

Test stand

For engine

731173, 123419, 123436, 36443107, G01M 1500

Patent

active

057289417

ABSTRACT:
In a misfire detecting apparatus of an internal combustion engine, a difference in rotational-speed variance from a rotation signal NE of a crankshaft and the difference in rotational-speed variance is compared with a predetermined misfire criterion value in order to make a determination as to whether a misfire has occurred in the internal combustion engine. The misfire detecting apparatus is applied to a six-cylinder internal combustion engine. An ECU employed in the misfire detecting apparatus is used for calculating differences in rotational-speed variance by using a 720.degree. CA, a 360.degree. CA, and a 120.degree. CA differential techniques. The differences in rotational-speed variance computed by using the differential techniques are each compared with a respective predetermined misfire criterion value. An outcome of the comparison is used for updating a misfire count. The ECU makes a final determination as to whether a misfire has occurred in the internal combustion engine from data of a plurality of such misfire counts.

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