Abstract
The OBD II regulations require for 2002 model year cars a misfire identification rate of 100%. Actual misfire detection methods base on speed measuring but problems remain for high speed and low torque. This paper deals with another approach using knock sensors. Their signal contains strong peaks caused by the pressure distribution.A nonlinear polynomial filter is developed to extract and emphasize these peaks and to design a matched filter for the misfire detection purpose. The efficiency of this method is shown using real knock sensor data of a four-cylinder engine.
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