Apparatus and method for engine crankshaft torque ripple control in a hybrid electric vehicle

Abstract

A control system comprising a processor develops data controlling a combustion engine and a dynamoelectric machine arranged to interact with the engine to modify the torque output of the engine. An observer (10) develops observed data that comprises estimated engine speed, estimated crankangle, and estimated engine output torque represented as an estimated average value torque component on which is superimposed an estimated alternating polarity ripple torque component whose mean value over a time interval of interest is substantially zero. The estimated alternating polarity ripple torque component is an input to a torque controller (102) for the dynamoelectric machine which causes the machine to contribute, in real time, torque that substantially cancels the alternating polarity ripple torque component in the crankshaft torque.

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