| 摘要 |
PURPOSE:To suitably control the control timing by providing correcting means for response delay of a humidity sensor against the change of temperature in the set space of the humidity sensor, and preventing the absolute humidity signal and the dew point temperature signal from changing when only the temperature in the set space changes. CONSTITUTION:A humidity sensor 1 outputs the voltage Vr in response to the resistance value which changes corresponding to humidity conditions within a car room. On the other hand, a temperature sensor 4 is set on the surface of sensing the humidity of the sensor 1, and it detects the temperature changes of the sensor 1 itself to output the voltage Vt in response to the detected value. And relative humidity is determined by an operating means 5 form the voltages Vr, Vt, and a characteristic chart which is composed of the relative humidity using the temperature of the portion to be detected in humidity as a parameter and the resisting value of the humidity sensor is substituted to a characteristic chart which is composed of a voltage signal corresponding to the resistance value and relative humidity, and when relative humidity RHf is determined, the relative humidity represents relative humidity on the surface sensing the humidity of the temperature sensor. The absolute humidity and the dew point temperature are determined by operating the means 3 on the basis of a humidity-air diagram from the humidity RHf and the output Vt, and when signals KH, KT are outputted the humidity and the temperature within the car room are represented. |
