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Control Computers

Adapative-control-device

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Adapative control device

Details

Inventors: Okada, Tsuyoshi; Kobayashi, Toshiaki; Ozawa, Hidetaka;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP); Honda Motor Co., Ltd. (Tokyo, JP)
Primary Examiner: Callahan; Timothy P.
Assistant Examiner: Le; Dinh T.
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher

An adaptive control device is arranged to cancel periodic noises without any malfunction and delay if aperiodic noises are mingled in the periodic noises. In the adaptive control device, the reference signal sensor senses a reference signal. The reference signal is filtered in the adaptive filter. The filtered signal is applied to the actuator serving as an electrical-mechanical converting unit so that the signal may be added to the input noises. The added result corresponding to an error is converted into an electric signal through the effect of the sensor. The electric signal is applied to the periodic signal separator for separating the signal into a periodic error and an aperiodic error. The coefficient updating unit operates to update a tap coefficient of the adaptive filter by employing an algorithm such as an LMS by using the separated periodic error and the signal filtered by the transfer characteristic compensating filter.

DETAILED DESCRIPTION It is an object of the present invention to provide an improved adaptive control device which is capable of cancelling periodic noises even if aperiodic noises are mingled without any malfunction and delay.
In carrying out the above object, the adaptive control device according to the present invention includes periodic signal separating means for separating output errors corresponding to a differential signal between input noises and an output of the filter into aperiodic errors and periodic errors and an adaptive filer for setting a coefficient of the filter based on the periodic errors.
With this arrangement, the adaptive control device of the present invention enables to cancel only periodic errors in mingled periodic and aperiodic errors.
The periodic errors thus can be cancelled for a short time without having to be adversely affected by the aperiodic errors.

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