Air conditioning device for vehicle

Abstract

Abstract PURPOSE:To increase the rate of operation of a compressor in an air conditioning device in which temperature of a cooler is detected to set a level of working temperature for the compressor, by providing a vehicle deceleration detecting means and shifting a thermostat comparison level to the side of low temperature at the time of deceleration. CONSTITUTION:If a room temperature setting variable resistor 11 is operated to a high temperature side, output voltage VD of the variable resistor 11 is increased. Then a signal subtracted with sum voltage Vr of output voltages in sensors of room temperature, solar radiation and outside temperature from the voltage VD fed to the side of inversion input of an operational amplifier 7 is increased to decrease output of the operational amplifier 7. Consequently, reference voltage of an operational amplifier 23 receiving output of a cooler temperature sensor 27 at its non-inversion input side is changed to vary the on-off characteristic of a compressor through an electromagnetic clutch 29. At this time, if a switch 41 is turned on at deceleration of a vehicle, output of an operational amplifier 30 becomes L level and output of the operational amplifier 7 becomes H level to hold the above described reference voltage V to a constant valve.

Inventors

• 👤 Eiji Okura

Bibliographic Details