Abstract:
A method of controlling an air-conditioning system for a motor vehicle is disclosed. The method includes provisions for controlling a compressor to achieve a desired evaporator temperature. The method includes a step of selecting a gain parameter and a reset parameter according to the ambient temperature for use in a set of proportional-integral calculations.
Abstract:
A first solenoid-operated, discharge-line control valve (26) is moved between open and closed positions to control fluid flow in the discharge fluid line (18) between the compressor (12) and the condenser (14). A second solenoid-operated, liquid-line control valve (28) is moved between open and closed positions to control fluid flow in the liquid fluid line (20) between the condenser (14) and the evaporator (16). A controller (36) closes one of the flow control valves (26, 28) a period of time before closing the other flow control valve (26, 28).and shuts down the compressor (12) sequentially with the flow control valves (26, 28).
Abstract:
The invention relates to a motor vehicle comprising an air conditioning system with an air conditioning compressor, whose output can be regulated by a stroke adjustment, said stroke adjustment being effected by the regulation of the pressure in the drive chamber of the compressor using at least one control valve. The invention also relates to a regulation device for the air conditioning system with a regulation of the characteristic diagram and to an internal combustion engine with a device for electronic motor management.
Abstract:
La présente invention a pour objet un procédé de contrôle de la température de sortie (TRCPO) d'un compresseur (CP) intégré dans une boucle de climatisation d'un véhicule automobile dans laquelle circule un fluide frigorigène sous critique et comprenant un condenseur (CD), une vanne d'expansion (EXV) et un évaporateur (EV). Le procédé de contrôle comprend - une étape de calcul d'une température limite à l'entrée du compresseur (TRCPI_L), - une étape d'estimation d'une température à l'entrée du compresseur (TRCPI_E), et - une étape de modification d'un signal de commande du compresseur (PWM cp ) ou d'une valeur de consigne de la température d'évaporation (SP_T EV )-
Abstract:
Air conditioning system (10), in particular an air conditioning system having carbon dioxide as refrigerant, particularly for use in a motor vehicle. The air conditioning system (10) comprises a compressor (12), a gas cooler (14), an expansion valve (16) and an evaporator (18) arranged in series and forming a closed circuit for the refrigerant. The compressor (12) has a compressor capacity control element and the air conditioning system (10) further comprises a controller (42) for controlling the compressor capacity control element and the expansion valve (16) so as to regulate an expansion valve inlet pressure. The controller (42) regulates the expansion valve inlet pressure by controlling the compressor capacity control element so as to align evaporator air off temperature with a set point; by monitoring expansion valve inlet temperature; by determining a required expansion valve inlet pressure corresponding to the monitored expansion valve inlet temperature by means of a control algorithm; and by adjusting the expansion valve (16) and the compressor capacity control element together along an iso-capacity curve to the required expansion valve inlet pressure.
Abstract:
A swash plate type variable displacement compressor, wherein, when a solenoid (42) of a flow control valve drive mechanism (32) is deenergized, a pilot valve (41) is closed so as to interrupt a working pressure to be introduced into a pressure chamber (35) of a flow control valve (31), thus closing a spool valve (33) so as to interrupt a low pressure side refrigerant path (25) to reduce the amount of refrigerant sucked to a refrigerant suction chamber (7) to zero.