FUZZY LOGIC CONTROL OF A VARIABLE DISPLACEMENT COMPRESSOR IN A VEHICLE AIR CONDITIONING SYSTEM
First Claim
1. A method of controlling an electrically activated displacement control valve of a variable displacement refrigerant compressor in an air conditioning system for regulating a system parameter to a desired value, the method comprising the steps of:
- measuring the regulated system parameter, and determining an error of the measured parameter with respect to the desired value;
measuring a pressure of refrigerant in the system, and detecting a rate of change of such measured pressure;
determining an activation adjustment for the control valve by applying fuzzy logic membership functions and predetermined fuzzy logic rules to the determined error and the detected rate of change in the measured pressure; and
adjusting an activation of said control valve based on the determined activation adjustment.
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Accused Products
Abstract
A non-linear control method for an air conditioning system utilizes fuzzy logic to regulate the activation a displacement control valve for a variable displacement compressor for maintaining a system parameter, such as the evaporator outlet pressure or temperature, at a desired value. The control inputs include the system parameter to be controlled and a refrigerant pressure that reflects changes in the compressor displacement.
13 Citations
3 Claims
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1. A method of controlling an electrically activated displacement control valve of a variable displacement refrigerant compressor in an air conditioning system for regulating a system parameter to a desired value, the method comprising the steps of:
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measuring the regulated system parameter, and determining an error of the measured parameter with respect to the desired value;
measuring a pressure of refrigerant in the system, and detecting a rate of change of such measured pressure;
determining an activation adjustment for the control valve by applying fuzzy logic membership functions and predetermined fuzzy logic rules to the determined error and the detected rate of change in the measured pressure; and
adjusting an activation of said control valve based on the determined activation adjustment. - View Dependent Claims (2, 3)
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Specification