Patent ID: 7633257

Claim:
An active vibration control system for use in a hybrid vehicle having a generator motor for assisting an engine in rotating a crankshaft thereof, comprising: a basic signal generator for generating a harmonic basic signal from a rotational frequency of the crankshaft; an adaptive notch filter for being supplied with said basic signal and outputting a control signal; a combiner for combining said control signal and a drive signal for said generator motor with each other and supplying a combined signal to said generator motor; an error signal detector for detecting a rotational speed fluctuation of the crankshaft and outputting an error signal representative of the detected rotational speed fluctuation; a corrective filter for being supplied with said basic signal and outputting a reference signal, said corrective filter having a transfer function of said generator motor; and filter coefficient updating means for being supplied with said error signal and said reference signal and successively updating a filter coefficient of said adaptive notch filter so that said error signal will be minimized, wherein the control signal effects only frequencies relative to the rotational speed fluctuation of the crankshaft, and the drive signal is representative of a motor assistance signal, and wherein the system suppresses a torque fluctuation of the crankshaft in response to the torque fluctuation without detriment to a response of the motor assistance signal.