JPS5682622A - Air-conditioning device for vehicle - Google Patents

Abstract

PURPOSE:To enable holding-down of the deviation of inner-vehicle temperature from set temperature to the minimum irrespective of the thermal load given to the vehicle by applying the concept of on-off control whereby the deviation can be held down to the minimum extensively to the multiposition control. CONSTITUTION:In the air-conditioning device which has upper and lower blow-out ports 2 and 3 opened in a car room 1, heaters 4 and 8 having bypass passages 6 and 10 and a cooler 14, etc., the control of inner-vehicle temperature is performed with provision of a subtractor 17 making subtraction of respective output of an inner- vehicle temperature setting device 15 and an inner-vehicle temperature detector 16 and of a damper-driving device 21 receiving an output 20 from a position-setting device 19 to which the output of the subtractor 17 is inputted and driving thereby a lower-part mix damper 11. The position-setting device 19 is constituted so that the position of the damper 11 is shifted when the value of the deviation of the inner- vehicle temperature from the set value exceeds a set range and when this condition continues for a set time, and thus the multiposition control of the damper 11 is made possible.