Motorola Corporation

Hanlong Yang

Jeffrey D Naber

Louis Yizhang Liu

Donald Peter Kultgen

Richard John Gilbert

A method and system for a misfire detection acquires () a series of acceleration data () representative of acceleration behavior of an engine. The data is sampled () to obtain acceleration data samples at a rate sufficient to obtain up to fourth-order perturbations of the data. The samples are filtered () to provide bandwidth limited samples, which are provided to at least two channels (). The samples are pattern matched () in a first channel to enhance harmonic phenomena and pattern canceled () in a second channel to enhance random phenomena. Hard and random misfires are detected () dependent on a magnitude of the filtered acceleration data samples. Preferably, a third channel () is added to detect multiple misfires.

Misfire detection in an internal combustion engine

An electronic throttle controller ( ) includes a feedforward control ( ), a PID ( ), a sliding mode control ( ) and an adder ( ). The PID ( ) is capable of generating a first feedback term that compensates for an error signal. The sliding mode control ( ) is capable of generating a second feedback term that incorporates a solution to a Lyapunov equation applied to the error signal with sliding gain being updated by an estimation of unknown dynamics. The adder ( ) adds the first feedback term, the second feedback term and the feedforward control ( ) so as to generate a control signal ( ).

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Northville, MI, United States of America

Hanlong Yang