Patent ID: 7762093

Claim:
A method of controlling an electronic control valve that controls discharge volume of a variable capacity compressor of an air conditioner of an automotive vehicle comprising the steps of: setting a target indoor temperature of the vehicle by an operator; sensing and inputting car indoor temperature of the vehicle, outdoor temperature and solar radiation of the region where the vehicle is located by using sensors mounted at predetermined positions of the vehicle; calculating a target discharge temperature of air processed by the air conditioner and flowing through a vent of the air conditioner using data indicative of the target indoor temperature, the sensed indoor temperature, the sensed outdoor temperature and the sensed solar radiation; calculating a target evaporator temperature and blower voltage according to the calculated target discharge temperature; calculating a control duty according to the calculated target evaporator temperature; calculating a target evaporator temperature change rate and a blower voltage change rate; determining whether or not the compressor experiences a sudden variable condition in response to the control duty, the target evaporator temperature change rate and the blower voltage change rate; and setting the maximum value of the control duty change rate to an accelerative slew rate greater than a basic slew rate in response to the sudden variable condition being determined, but setting the maximum value of the control duty change rate to a basic slew rate in response to no sudden variable condition being determined.