초록 ▼

A refrigeration system for an automotive air conditioner includes an evaporator and a variable displacement refrigerant compressor adapted to be driven by an automotive engine. In order to control the refrigeration system, detectors are provided to detect a condition related to the cooling operation

A refrigeration system for an automotive air conditioner includes an evaporator and a variable displacement refrigerant compressor adapted to be driven by an automotive engine. In order to control the refrigeration system, detectors are provided to detect a condition related to the cooling operation of the evaporator, such as air temperature just downstream of the evaporator or the refrigerant pressure, and to detect air temperature in the occupant compartment of the automobile, ambient air temperature outside the automobile or intake air temperature upstream of the evaporator. Signals emitted by the detectors are utilized to control the compressor operation such that the displacement capacity of the compressor is varied stepwise and the compressor is operated intermittently whereby the load on the engine is reduced and the frosting of the evaporator is prevented.

대표청구항 ▼

A method of controlling a refrigeration system for an automotive air conditioner, said system including a variable displacement refrigerant compressor and an evaporator, the method including: detecting a condition related to the cooling operation of said evaporator to obtain a first signal related t

A method of controlling a refrigeration system for an automotive air conditioner, said system including a variable displacement refrigerant compressor and an evaporator, the method including: detecting a condition related to the cooling operation of said evaporator to obtain a first signal related to said condition; detecting the temperature of air in an occupant compartment of the automobile to obtain a second signal related to said air temperature; and controlling the operation of said compressor in accordance with said first and second signals such that the displacement of said compressor is varied step-wise and said compressor is operated intermittently whereby the occurrence of frosting on said evaporator is avoided, and wherein, when said second signal is at a level greater than a predetermined high level, said compressor is adjusted to be operative at a large displacement capacity and said compressor is intermittently operated at said large displacement capacity in accordance with said first signal; and when said second signal is decreased to a level less than a predetermined low level, said compressor is adjusted to be operative at a small displacement capacity and said compressor is intermittently operated at said small displacement capacity in accordance with said first signal.