| 摘要 |
PURPOSE:To make plural apparatuses controllable with one water temperature sensor alone, by comparing input signals out of the water temperature sensor, of which resistance value varies in response to a variation in cooling water temperature, with the setting value corresponding to each of apparatuses. CONSTITUTION:A water temperature sensor 24 is of thermistor in type that the higher in detection temperature the smaller in the resistance, and a heat indicator 101 supplied with constant voltage via an ignition key 21 and a Zener diode and the water temperature sensor's branching-off point voltage Vc become smaller in proportion as the detected temperature comes high. The branching-off point voltage Vc is inputted into an arithmetic unit IC1 for controlling a radiator fan relay 25 and another arithmetic unit IC2 for controlling an air conditioner clutch relay 26 respectively, and compared with each of voltage setting values VA and VB parted by resistor R2-R4. |
