Valeo Climatisation

Valeo Systemes Thermiques

Jin Ming Liu

Mohamed Yahia

Bertrand Nicolas

Bruno Hamery

Jugurtha Benouali

Mohamed Ben Yahia

Régine Haller

Laurent Delaforge

Emmanuel Mace

The invention relates to an air-conditioning loop for heating, ventilation, and/or air-conditioning equipment in which a coolant circulates. The loop including a compressor comprising a coolant outlet connected to a delivery pipe and a coolant inlet connected to a suction pipe. The loop also including an internal heat exchanger which is capable of functioning at least as a condenser, and which is connected to the compressor via the delivery pipe. The loop also including an external unit which is connected to the compressor via the suction pipe and which includes at least one external heat exchanger capable of functioning at least as an evaporator, with the internal heat exchanger being connected to the external unit via a first intermediate duct comprising at least one pressure-release member. The loop includes a deicing pipe connected to the compressor and/or to the delivery pipe, as well as to the external unit.

Air-conditioning loop functioning as a pulse electro-thermal deicing heat pump

An air conditioning device is used in a motor vehicle. The air conditioning device includes air conditioning circuit, which includes a compressor (), a condenser (), and/or an internal exchanger, an electric expansion valve () which opening ratio is changed according to a control signal, and an evaporator (), which are traversed in this order by a refrigerant fluid and a control unit () capable of controlling a control signal of the expansion valve so as to regulate a control variable relating to the superheating of the evaporator or to the sub-cooling of the condenser () according to a chosen regulation rule.

Air conditioning system provided with an electronic expansion valve

Control process of an expansion valve (EXV) situated in an air conditioning circuit in which circulates and flows a coolant, with the air conditioning circuit comprising at least a compressor (CMP), a condenser (CND) and an evaporator (EVP), characterized in that this control process includes the following steps or stages: when overheating is less than a threshold value, opening of the expansion valve is governed by a static control, and when overheating is higher than the threshold value, opening of the expansion valve is governed by a dynamic control.

Control process for an expansion valve

The invention proposes an air conditioning system for motor vehicles which is fitted with an injection computer and an electronic control device. The system comprises a first measuring member suitable for supplying a value relating to the pressure of the fluid at a first point in the air conditioning circuit which is situated between the outlet of the expansion member and the outlet of the evaporator, and a second measuring member suitable for supplying a value relating to the pressure of the fluid at a second point in the air conditioning circuit which is situated at the inlet to the compressor. The electronic control device makes use of the solution of an equation which relates the mass flow rate of the refrigerant fluid to the difference in pressure between the first point and the second point in order to calculate an estimate of a magnitude relating to the refrigerant fluid.

Air conditioning system comprising an electronic control device

A signal value is derived that is representative of the cooling power produced by an air-conditioning evaporator, the signal value being derived from at least one temperature sensor placed in thermal contact with the evaporator, or downstream from it in the cooled airflow, and the signal value is compared with a reference value corresponding to a normal refrigerant-fluid level. A signal value below the reference value indicates a low level of refrigerant-fluid.

Method for checking the refrigerant-fluid level of a closed loop vehicle air-conditioning system

The temperature of an airflow cooled by an evaporator of a closed loop air-conditioning system, determined by means of a sensor, is compared with a theoretical value corresponding to the control current of an external-control, variable-displacement compressor, in order to detect a low level of refrigerant fluid in the system or any blocking of a compressor valve.

Method for checking the state of a closed loop air-conditioning system comprising a variable-throughput compressor

In a device for air conditioning a motor-vehicle passenger compartment, a control module adjusts electrical power supplied to a motor-driven fan unit delivering airflow to a condenser of the device. Means are furthermore provided for recording an air throughput passing over the condenser and produced, at least in part, by the motor-driven fan unit. A regulation module estimates a maximum value of the electrical power supply to the motor-driven fan unit, for a given air throughput, with a view to limiting the electrical power supply to this maximum value, as a function of the air throughput.

Growing community of inventors

Conflans S/Honorine, France

Jin Ming Liu