Control system for variable capacity type compressor for air con

Details Control system for variable capacity type compressor for air con Control system for variable capacity type compressor for air con

1987-05-14

1988-02-09

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

622285, F25B 100

Patent

active

047234164

ABSTRACT:
A control system for controlling a compressor for an air conditioning system of a vehicle. A variable capacity type compressor is disposed to be driven by an engine of the vehicle. The compressor is adapted to vary in capacity with a change in pressure within a crank chamber thereof. A first calculator calculates thermal load on the air conditioning system, and a second calculator calculates the rotational speed of the engine. An upper limit setter sets an upper limit value of suction pressure within the compressor in such a manner that the upper limit value is increased with an increase in the thermal load, and decreased with an increase in the rotational speed of the engine. A capacity controller is responsive to a difference between the set upper limit value of suction pressure and the sensed actual suction pressure for adjusting the pressure within the crank chamber to vary the capacity of the compressor.

REFERENCES:
patent: 4157233 (1979-06-01), Horiuchi
patent: 4628700 (1986-12-01), Alsenz
patent: 4669272 (1987-06-01), Kawai et al.

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