| 摘要 |
PURPOSE:To maintain the visibility through a window glass continuously by detecting environment around a vehicle so as to judge a condition which makes the window glass foggy whereby actuating a fog removal means before having fogs. CONSTITUTION:When an air conditioning switch 75 is turned on, output signals from a rain sensor 2, an outside air temperature sensor 3, and a cabin temperature sensor 4 are inputted into a control circuit 1. And when the output X from the rain sensor 2 is greater than a set value Xp corresponding to the number of rain drops for high humidity, the outside air temperature Tout is compared with the cabin temperature Tin. And in case of Tout>=Tin, the difference Tx between the two is computed so as to be compared with a set value Tp based on the temperature difference in and out of a vehicle which meets the necessary condition for having fogs programmed in advance for the case of humidity Xp. If the comparison indicates Tx>=Tp, as a window glass is suspected to become foggy, a compressor 5 is driven so as to prevent possible fogging. |
