Apparatus for controlling a variable displacement refrigerant co

Details Apparatus for controlling a variable displacement refrigerant co Apparatus for controlling a variable displacement refrigerant co

1988-08-26

1990-06-19

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62229, 62243, F25B 100

Patent

active

049341570

ABSTRACT:
An apparatus for controlling a displacement changing unit of a variable displacement type refrigerant compressor arranged in a car air-conditioner circuit, including a refrigerant evaporator for cooling air for air-conditioning a compartment of a car, is provided with a temperature detecting device for detecting an actual temperature of the air for air-conditioning the car compartment, a temperature setting switch for setting a desired temperature of the air for air-conditioning the car compartment, a unit for generating an electric signal indicating a change in an operating condition of the air blowing fan of the refrigerant evaporator, a control unit for carrying out a PID control to control the operation of the displacement changing unit of the compressor in response to a difference between the actual and desired temperatures and a signal of a unit for generating an electric signal indicating a change in the operating condition of the air blowing fan, to thereby eliminate the difference between the desired and actual air temperatures while suppressing hunting which causes a change in the actual temperature of the air, for air-conditioning the car compartment during the control operation of the control unit.

REFERENCES:
patent: 4325426 (1982-04-01), Otsuka et al.
patent: 4510764 (1985-04-01), Suzuki
patent: 4649709 (1987-03-01), Kagohata et al.
patent: 4662185 (1987-05-01), Kobayashi et al.
patent: 4702677 (1987-10-01), Takenaka et al.
patent: 4747754 (1988-05-01), Fujii et al.

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