| 摘要 |
PURPOSE:To secure durability, by contriving an improvement in agreeable feeling and restricting a compressor so that the minimum value of OFF time of the compressor does not become lower than a predetermined value by setting up a variation range of a temperature of a blow-off air small. CONSTITUTION:When a temperature of blow-off air is lowered and a magnetic clutch 6 is turned OFF, the clutch 6 is apt to turn ON by raising the temperature of the blow-off air. During a time Tset, however, to be decided by resistor R11, a capacitor C1 and voltage at a point E the clutch 6 does not turn ON. As thermal load is large, this phenomenon occurs when a variation speed of the temperature of the blow-off air is large. Although the temperature of the blow- off air is turned into DELTATe' which is larger than DELTATe, durability of a compressor is secured. When the thermal load is small and the variation speed of the temperature of the blow-off air is small, the magnetic clutch is being turned OFF for more than a period of time corresponding to a predetermined temperature and a variation range of the temperature of the blow-off air can be controlled small at DELTATe. |
