Device for controlling capacity of variable capacity compressor

Details Device for controlling capacity of variable capacity compressor Device for controlling capacity of variable capacity compressor

1988-01-11

1989-07-04

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

622283, 62226, F25B 4100

Patent

active

048438340

ABSTRACT:
A control device for a compressor in an automotive air conditioning system is disclosed which includes a pressure sensor disposed on a conduit concerning an evaporator and the compressor for detecting a refrigerant pressure at an outlet side of the evaporator. A control unit compares a pressure change ratio based on the detected refrigerant pressures with a predetermined pressure change ratio and selects either one of two ranges of predetermined values in accordance with the compared results, and further compares the refrigerant pressure with the predetermined values, thereby controlling the operation of an electromagnetic clutch which is mounted on the compressor and the capacity of the compressor in accordance with the last mentioned compared results.

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