System and method for controlling a variable displacement compressor
First Claim
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1. A system for controlling a variable displacement compressor comprising:
- a control valve for controlling pressure in a crankcase of a variable displacement compressor; and
a control unit that controls said control valve based on a comparison between a target pressure and said pressure in said crankcase.
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Abstract
A system and method for controlling the displacement of a variable displacement compressor by feeding back crankcase pressure as part of a control scheme is disclosed.
117 Citations
21 Claims
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1. A system for controlling a variable displacement compressor comprising:
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a control valve for controlling pressure in a crankcase of a variable displacement compressor; and a control unit that controls said control valve based on a comparison between a target pressure and said pressure in said crankcase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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19. A method for controlling a variable displacement compressor having a control valve for controlling the amount of the displacement of the compressor utilizing crankcase pressure, comprising the steps of:
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a) setting a target crankcase pressure; b) measuring crankcase pressure of a variable displacement compressor; c) comparing the target crankcase pressure and the measured crankcase pressure to determine a difference between the target crankcase pressure and the measured crankcase pressure; and d) controlling the position of a control valve for controlling the amount of the displacement of the compressor based on the difference determined between the target crankcase pressure and the measured crankcase pressure. - View Dependent Claims (12, 13, 14, 15)
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- 20. A method for controlling a variable displacement compressor of the type in which the amount of the displacement of the compressor is controlled by varying crankcase pressure, comprising the step of varying a signal to control compressor displacement as a function of a comparison between a target crankcase pressure and a measured crankcase pressure.
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21. (canceled)
Specification