| 摘要 |
PURPOSE:To improve vehicle room environment when room air is polluted by determining the condition of ambient air, comparing the degree of pollution between the room air and ambient air, and introducing ambient air into the room only when the room air is polluted and the ambient air is normal. CONSTITUTION:Outputs from both ambient air condition sensor 8 and room air condition sensor 9 are inputted into a comparator 10 and compared for the degrees of pollution between the ambient air and room air. When the degree of pollution of the ambient air is excessive, a relay 11 functions to close a switch 12 and a shutter 6, thus shutting off ambient air introduction. When the ambient air becomes clean, the relay 11 is released and the shutter 6 is opened with force of a spring 5 to introduce the ambient air. With this construction, room environment of the vehicle can be improved. |
