Title:
ACTIVE NOISE VIBRATION CONTROLLER
Document Type and Number:
Japanese Patent JP3228224
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make a periodic variation (beat) state of a drive signal, etc., detectable without causing any great increase in arithmetic load.
SOLUTION: According to the amplitude of the drive signal, whether or not the drive signal periodically varies is detected. In concrete, temporal variation (gradient) in amplitude is found (step 103) from the difference between the latest value of the amplitude and the value just before it and it is judged that the amplitude increases monotonously (step 111) when the continuance T1 of a state wherein the temporal variation is larger than a specific threshold γ(>0) reaches a specific time Tth1 and decreases monotonously (step 122) when the continuance T1 of a state wherein the temporal variation is less than a specific threshold value -γ reaches the specific time Tth1; and then it is judged that the periodic variation state of the drive signal is detected and a process for decreasing a convergence coefficient μ is performed (step 123).
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Inventors:
Ken Kimura
Shigeki Sato
Kato Sato
Hiroshi Kawazoe
Shigeki Sato
Kato Sato
Hiroshi Kawazoe
Application Number:
JP14727398A
Publication Date:
November 12, 2001
Filing Date:
May 28, 1998
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
B60K5/12; G05B13/02; G05D19/02; G10K11/178; (IPC1-7): G05D19/02; G10K11/178
Domestic Patent References:
| JP540488A | ||||
| JP643883A | ||||
| JP7239690A | ||||
| JP4282696A |
Attorney, Agent or Firm:
Tetsuya Mori (3 others)
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