| 摘要 |
PURPOSE:To prevent overheat of a refrigerating compressor when the compressor is stopped, by providing a control circuit which stops the operation of the refrigerating compressor and runs an electric fan for a predetermined period of time if an engine is operated under a heavy load. CONSTITUTION:A refrigerating cycle 400 is provided with both a refrigerating compressor 410 driven by an engine and a refrigerant condenser 420, which is placed upstream with respect to the air that is subject to a heat-exchange with a radiator 201. Meanwhile, an electric fan 300 operates in correspondence to the refrigerant pressure of the refrigerating cycle 400, thereby forcing the air and the radiator 201 to conduct a heat exchange. At this time, if the predetermined conditions regarding heavy load operation of the engine during the refrigerating operation of the refrigerating cycle 400 are satisfied, a heavy load signal generating circuit 710 gives a heavy-load-signal. Then, a refrigerating cycle control circuit 720 stops the operation of the refrigerating compressor 410 for a predetermined period of time, while an electric fan control circuit 730 runs the electric fan 300 for a predetermined period of time, regardless of the refrigerant pressure of the refrigerating cycle 400. |
