| 摘要 |
PURPOSE:To eliminate the manual swithcing operation, remove glass fogging, prevent the inflow of exhaust gas, and hold a comfortable state by inputting output signals from a car speed sensor and a timer circuit and switch-controlling the inside air circulation and the outside air introduction. CONSTITUTION:The inside air ciculatin within a car room is performed by turning ON a switch and whether or not a car is running is determined based on the output signal of a car speed sensor 4. For NO, the lapse of the halt time is determined and for YES, the preset car speed excess is determined. In addition, for excessive car speed, a switching valve 10 is operated and outside air is introduced. For NO, the lapse of the inside air circulation time is determined based on the output signal of a timer 18. If the time does not elapse, the inside air circulation is performed subsequently and for YES, whether the car is being accelrated or not is determined. At non-acceleration, the outside air introduction is performed by the switching valve 10 and at accelration, the inside air circulation is performed. Furthermore, the lapse of the halt time is determined based on the output signak of a timer 20. If the time does not elapse, the inside air circulation is performed subsequently and the outside air induction is performed while the car is running. As a result, the inflow of exhaust gas and glass fogging can be prvented by automaticaly switcing the inside air circulation and the outsidce air introduction. |
