INSIDE AIR AND OUTSIDE AIR SWITCHING DEVICE

PROBLEM TO BE SOLVED: To perform inside air and outside air switching control while sufficiently making the most of the performance of a filter. SOLUTION: This device is provided with an air blowing means 2 for blowing outside air or inside air to a cabin, the filter 10 attachably/detachably mounted in an air blow path of outside air or inside air, a switching means 4 for switching the air blow path to the introduction of the outside air or circulation of inside air, a contamination detection means 23 for detecting a degree of the contamination of the outside air, and a switching control means 20 for controlling the switching means 4 so that the air blow path may be switched according to a degree α of the contamination of the outside air detected by the contamination detection means 23 and a characteristic of the switching may be changed according to dust-removing performance depending on the kind of the mounted filter 10. COPYRIGHT: (C)2007,JPO&INPIT