| 摘要 |
PROBLEM TO BE SOLVED: To precisely detect abnormality by providing an abnormality detecting means for detecting abnormality according to a drive signal to a control sound source or a control vibration source and a variable threshold depending on the level of noises or vibration. SOLUTION: When the engine rotating speed NE is low, as the vibration level of the engine is high, the signal value level of a drive signal yA for controlling the level is enlarged, and at this time, as a threshold Hth, a comparatively high current value is set from a control map. On the contrary, when the engine rotating speed NE is high, as the vibration level of the engine is low, to inhibit the vibration, the level of the drive signal becomes lower so that as a threshold Hth, a comparatively small current value is set from a control map. That is, the threshold Hth corresponding to the level of the drive signal yA is set. Thus, the threshold Hth is set corresponding to the level of the drive signal yA, so that wrong detection for abnormality can be prevented to precisely detect abnormality.
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