| 摘要 |
PURPOSE:To make a compressor perform good air conditioning without any drop in engine power performance, by disconnecting a magnet clutch and stopping the compressor for a specified period of time after detection of suction pressure in time of full acceleration, while forcibly operating the compressor in time of detection of the suction pressure other than said full acceleration. CONSTITUTION:When suction pressure in a suction pipe becomes below 40mm.Hg, the output of a timer 7 comes to a low level whereby a time constant rises. Under this condition, one side input terminal potential of a comparator 12 goes up, exceeding a partial pressure value VT2, and the output comes to a low level as well. If so, a transistor 13 is turned off, causing the movable contact of a relay 14 to open, and a continuous rating current to a magnet clutch 15 is shut off whereby a compressor stops. When the output of a timer 7 exceeds a partial pressure value VT1, the output of a comparator 8 becomes a low level, and the terminal potential of a comparator 12 drops so that the partial pressure value VT2 also goes down. If so, the output of the comparator 12 comes to a high, level, turning on the transistor 13, and the continuous rating current to the magnetic clutch 15 takes place, thus a compressor operates and good air conditioning is kept up. |
