Air conditioning installation for motor vehicle, has control unit controlling control signal of electric expansion valve to regulate control magnitude relative to overheating of evaporator or cooling of condenser based on regulation law

摘要

#CMT# #/CMT# The installation (100) has an air conditioning circuit (10) with an electric expansion valve (12). A control unit (40) controls a control signal of the valve to regulate a control magnitude relative to overheating of an evaporator (13) or cooling of a condenser/gas cooler (11) based on a regulation law e.g. proportional-integral-derivative regulation. The magnitude relative to overheating corresponds to a difference between two temperature measurements corresponding to a temperature of fluid e.g. R-134a fluid, taken at the level of an inlet and an outlet of the evaporator. #CMT# : #/CMT# An independent claim is also included for a method for regulating an air conditioning circuit. #CMT#USE : #/CMT# Air conditioning installation for a motor vehicle. #CMT#ADVANTAGE : #/CMT# The control unit controls the control signal of the electric expansion valve to regulate the control magnitude relative to overheating of the evaporator or cooling of the condenser based on the regulation law, thus obtaining optimal electrical architecture and a maximum coefficient of performance, and protecting the installation to limit discharge temperature and suction temperature of a compressor, while permitting the installation to have reduced number of sensors, and hence reducing cost of the installation. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view of an air conditioning installation. 10 : Air conditioning circuit 11 : Condenser or gas cooler 12 : Electric expansion valve 13 : Evaporator 40 : Control unit 100 : Air conditioning installation.