Engine misfire detection with compensation for normal accelerati

Details Engine misfire detection with compensation for normal accelerati Engine misfire detection with compensation for normal accelerati

1995-06-06

1996-11-12

Chilcot, Richard

Measuring and testing

Test stand

For engine

36443107, 36443108, 123419, 731173, G01M 1500

Patent

active

055742173

ABSTRACT:
An apparatus and method are provided for detecting cylinder misfires in an internal combustion engine of a motor vehicle which is capable of detecting multiple cylinder misfires and more particularly opposed cylinder misfires. Crankshaft rotation is sensed and crankshaft velocities are measured for each cylinder. Changes in angular velocity are determined and correspond to each of a plurality of cylinder firing events. Angular velocity changes are sorted over a predetermined series of cylinder firings and the two middle most angular velocity changes are averaged to provide an average change in velocity value. A deviation is determined between the change in angular velocity for a selected cylinder and the average change in velocity value. The deviation is compared to a threshold value and a misfire event is determined for the selected cylinder based on the comparison.

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