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Misfire Detection Using the Variation of the Crankshaft Speed
ipc-8-95/9530319

Authors

Sangsoo Pae - Seoul National University
Inkeon Lim - Seoul National University
Jongbum Park - Seoul National University
Eungseo Kim - Seoul National University
Byeongjin Lim - Turbo and Power Machinery Research Center

Abstract

This paper presents the method to monitor the engine misfire as a part of the OBDII requirements. Engine misfire is described by the engine roughness. The engine roughness is calculated by integrating the pressure torque from the instantaneous angular velocity of each combustion stroke and the integral of pressure torque is compared with the integral of the motoring torque corresponding to the intake manifold pressure. Additionally, the speed waveforms are measured both at the flywheel and the front end. The flywheel speed waveform shows better result than the front end one. This method proves to be efficient in monitoring the engine misfire and in identifying the specific cylinder or cylinders experiencing the single or continuous misfire.

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