Misfire detection in an internal combustion engine

Details Misfire detection in an internal combustion engine Misfire detection in an internal combustion engine

1991-06-05

1992-05-05

Raevis, Robert

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

051096951

ABSTRACT:
A method and apparatus are provided for reliably detecting misfires in an internal combustion engine during actual driving conditions by monitoring fluctuations in engine speed between consecutive firing intervals. An average acceleration over a series of firing intervals is removed from an individual acceleration measurement corresponding to a particular firing interval to give an acceleration deviation which is then normalized to an expected torque to provide a power loss measurement. The power loss measurement indicates the occurrence of a misfire with a high signal-to-noise ratio. The information derived from misfire detection can be used to prevent destruction of a catalytic converter by unburned fuel mixtures and can be used to improve vehicle driveability by correcting for or indicating needed service for the vehicle. The misfire detection is implemented using existing sensors and processors and is adapted to be done on-board a vehicle in real time. Noise present in the acceleration data is measured and a no-test condition is recognized depending on the magnitude of the measured noise.

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