Dynamic control of a variable displacement compressor

Details Dynamic control of a variable displacement compressor Dynamic control of a variable displacement compressor

2004-12-22

2008-07-01

Tapolcai, William E (Department: 3744)

Refrigeration

Processes

Compressing, condensing and evaporating

C062S176600, C062S228300

Reexamination Certificate

active

07392659

ABSTRACT:
Controlling displacement in a variable displacement compressor of an automobile air conditioning system entails detecting the temperature and humidity level of air entering the evaporator, setting a target air probe temperature from inside the automobile, and reading the evaporator air-out temperature at the temperature probe. From these parameters, the evaporator suction pressure can be calculated as can the load on the evaporator and the refrigerant flow rate so that the compressor swash plate angle, and thus, the compressor displacement, can be adjusted. After adjusting the compressor swash plate angle, calculating the absolute value of a difference between the actual air probe value and the vehicle occupant's air probe setting can be performed. If the absolute value is less than 0.5 degrees Fahrenheit, then the compressor stroke can be maintained, but if it is not, then the iteration must again be performed.

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patent: 2003/0136138 (2003-07-01), Tsuboi et al.
patent: 2004/0144106 (2004-07-01), Douglas et al.

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