Control curve for variable delivery compressor

Refrigeration – Processes – Assembling – charging – or repairing of refrigeration producer

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62298, 622783, 417295, G01M 1900

Patent

active

056899602

ABSTRACT:
A method for adjusting an air conditioner compressor for a particular vehicle application involves selecting the proper control curve. The control curve is a graph of suction inlet pressure verses discharge pressure. The graph has a linear portion over which increased discharge pressure decreases suction pressure. The low demand condition at which suction pressure is highest and discharge pressure lowest may result in an evaporator outlet pressure that is too high or too low. To change the evaporator outlet pressure, the control valve for the compressor is adjusted or replaced to vary the slope of the linear portion of the control curve. Varying the slope will change the maximum suction pressure to reach an optimized solution under low demand conditions. The slope is varied by changing a bias pin in the modular control valve to one of a different diameter. The bias pin is one factor that controls the opening and closing of the valve to vary the capacity of the compressor.

REFERENCES:
patent: 2169605 (1939-08-01), Griese
patent: 4989412 (1991-02-01), Johnson
patent: 5142876 (1992-09-01), Snider et al.
patent: 5364235 (1994-11-01), Bearint
patent: 5492450 (1996-02-01), Bearint et al.
patent: 5540565 (1996-07-01), Bearint

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