Expansion member controlling method for heating, ventilating and/or air conditioning installation of motor vehicle, involves considering information of overheat at evaporator exit for controlling member to calculate value of passage section

摘要

The method involves providing an electronic board (11) for controlling an expansion member (6) based on information (Tsr) relating to a temperature of refrigerant e.g. carbon di oxide, in exit of gas cooler (4) for calculating a value of passage section (X). Information (S) relating to overheat at exit of evaporator (7) is considered for controlling the member to calculate the value of the section. Information relating to the temperature and/or pressure of refrigerant at the exit of compressor is considered to calculate the value of the section. An independent claim is also included for an air conditioning loop comprising an expansion member and internal heat exchanger.