| 摘要 |
PURPOSE:To automatically supply clean air into the inside of a vehicle by using a system in which sensors for dust concentration are each attached to air intake parts for the outside and inside of the vehicle and switching is made automatically toward the intake of air with lower dust concentration. CONSTITUTION:The dust concentrations of the open air A and internal air B are detected by sensors 6 and 7, and the detected values by the sensors 6 and 7 are compared. A valve 5 is switched to take in air with lower dust concentration. For example, when the open air A is dirty and the internal air B in the vehicle is low in dust concentration, the valve closes the pathway on the open air intake port 2 side, as shown by two-dot chain line, and the internal air B is taken in. In this way, air with lower dust concentration, among the open air and internal air of vehicle, is taken in and clean air is supplied to the inside of the vehicle. |
