Control unit for variable displacement compressors

Details Control unit for variable displacement compressors Control unit for variable displacement compressors

2005-09-20

2005-09-20

Tanner, Harry B. (Department: 3744)

Refrigeration

Automatic control

Diverse, cascade or compound refrigeration-producing system

C062S229000, C062S323100

Reexamination Certificate

active

06945061

ABSTRACT:
A control unit for variable displacement compressors is used for two independent air conditioning cycles, wherein two compressors1, 11driven by a common external drive source8include electromagnetic displacement control valves6, 16, respectively. By controlling these control valves by ECU7, the displacement of the compressor is variable. When the air temperature is higher than a predetermined temperature T0, both of the compressors are subjected to the variable displacement operation even though one of them is unnecessary for the air conditioning operation. On the contrary, if the outer air temperature is lower than the predetermined temperature, only one compressor, needed for the air conditioning operation, is subjected to the variable displacement operation, while the other compressor is subjected to the minimum displacement operation.

REFERENCES:
patent: 2242588 (1941-05-01), McGrath
patent: 2296741 (1942-09-01), Sanders, Jr.
patent: A-2000-220577 (2000-08-01), None

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