| 摘要 |
<p>PURPOSE:To enable the correspondence to such status that operating sound of an on-vehicle air cleaner is highly felt by the kind of a car to be mounted therewith in nighttime or when the inside of the car is quiet. CONSTITUTION:The on-vehicle air cleaner has an automatically operating function corresponding to dirt in the inside of a car. A small sized microphone is provided. When overall noise in the inside of the car is detected and noise value is small, the upper limit of revolving speed of a motor fan in the inside of the air cleaner is limited to a level lower than that in the case when noise is large.</p> |
