Refrigeration – Automatic control – Refrigeration producer
Patent
1993-01-08
1994-05-31
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62229, F25B 4902
Patent
active
053158415
ABSTRACT:
The present invention is directed to a control apparatus for use in an automotive air conditioning system which includes a variable capacity type refrigerant compressor. The automotive air conditioning system comprises a refrigerant circuit including a refrigerant compressor with an externally controlled variable capacity control mechanism and an evaporator connected to a suction chamber of the compressor, and a control apparatus which controls operation thereof. The control apparatus includes an adjusting device for adjusting a pressure control point in the compressor suction chamber. At the time operation of the refrigerant circuit is initiated, the pressure control point of the compressor suction chamber is adjusted to a predetermined constant value which is determined by air temperature immediately downstream from the evaporator. Shortly thereafter, but still during the initial stage of operation of the refrigerant circuit, the pressure control point of the compressor suction chamber is varied by a proportional control action as the air temperature immediately downstream from the evaporator becomes equal to or lower than a predetermined value. Accordingly, a passenger compartment of the automobile can be more adequately air conditioned throughout the initial stage of operation of the automotive air conditioning system.
REFERENCES:
patent: 4843834 (1989-07-01), Inoue et al.
patent: 4848099 (1989-07-01), Beckey et al.
patent: 5148685 (1992-09-01), Takano et al.
Sanden Corporation
Tanner Harry B.
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