| 摘要 |
PURPOSE:To prevent an adverse effect of the radiation of solar heat in time of automatic temperature adjusting operation being stable, by using a solar radiation sensor and a resistor, as a current limit element, for a car conditioning control circuit in common. CONSTITUTION:When a manual controller 10 is turned to an automatic position, a movable contact 14 of a temperature adjusting switch member 11 is interlocked with an air mix damper 4 by means of a temperature adjusting actuator 15 and driven and moved while contacting all the time with either of plural fixed contacts connected to each contact of a group of resistors 6-9, as current limit elements. A solar radiation sensor 22 is being connected to a resistance 25 and there produces such voltage as being commensurate to a light receiving quantity at a connection point with the resistance 25. This voltage is inputted into a voltage-current transducer 27, and an electric current corresponding to the light receiving quantity is absorbed from a generating point of signal voltage V3 via a diode 28. In consequence, the amount of mechanical displacement in the temperature adjusting actuator 15 is altered so as to conform the radiation of solar heat. When the heat radiation exceeds a certain value, a short circuit switch 12 is closed by an electrical control circuit 17. |
