Valeo Systemes Thermiques

Valeo Climatisation

Jin-Ming Liu

Mohamed Yahia

Stefan Karl

Bertrand Nicolas

Roland Akiki

Jugurtha Benouali

Muriel Porto

Regine Haller

Régis Beauvis

Régine Haller

Abdelmajid Taklanti

Christophe Rousseau

Jean-Luc Thuez

Yulia Glavatskaya

Eng Kuach

Samy Hammi

Wissem Nouainia

Thomas Guenet

Laetitia Clemaron

The invention relates to a method for controlling a thermal conditioning circuit () for thermally conditioning an air flow (), notably intended for a motor vehicle interior (), the circuit comprising a heat exchanger () configured to have a refrigerant pass through it and exchange heat with the air flow (), the heat exchanger () being configured to operate selectively in at least: —a mode known as cooling mode, —a mode known as heating mode, the method comprising the steps of: —evaluating a level of humidity in a region in contact with an exterior surface () of the heat exchanger (), —detecting an instruction to switch from cooling mode to heating mode, —if the evaluated level of humidity is below a predetermined first threshold (s), allowing refrigerant to circulate through the exchanger () in response to the instruction to switch to heating mode, —if the level of humidity is above a predetermined second threshold (s), preventing the refrigerant from circulating through the exchanger () for a first predetermined length of time (D), so as to delay the switch to heating mode.

Method for controlling an air-flow thermal conditioning unit

Disclosed is a method for defrosting a thermal regulation circuit for a vehicle, in particular for a motor vehicle, the thermal regulation circuit being provided with a refrigerant circulation loop comprising a first heat exchanger (), susceptible to frosting, as well as second and third exchangers (), the second and third exchangers () being intended to exchange heat between the refrigerant and a heat transfer fluid, the loop further comprising a bottle () for storing a part of the refrigerant, the method comprising a step, referred to as defrosting, of circulating the refrigerant successively in the second heat exchanger (), the bottle () and then the first and third exchangers (), with cooling of the refrigerant in the first and second exchangers () and heating of the refrigerant in the third exchanger ().

Method for defrosting a thermal regulation circuit for a vehicle, in particular for a motor vehicle

The invention concerns a method for managing a thermal management device () for a motor vehicle, comprising the following steps: —increasing the speed of rotation of the compressor () to its maximum speed, —determining a modified setpoint temperature (T-) of the third element () greater than the first setpoint temperature (T-), so that the temperature of the second element () at the outlet of the first evaporator () tends towards its setpoint temperature (T-), —adjusting the opening diameter of the second expansion device () so that the temperature of the third element () at the outlet of the second evaporator () reaches a modified setpoint temperature (T-), until the temperature of the second element () at the outlet of the first evaporator () reaches the setpoint temperature (T-). The invention further relates to the thermal management device () for implementing said management method.

Method for managing a thermal management device for a motor vehicle and associated thermal management device

A method for controlling a system for a motor vehicle is disclosed. The system includes an actuator, a volatile memory (RAM) in which an item of position information of the actuator (IP) is stored, and a long-term memory (EPROM). The following are stored in the long-term memory (EPROM): at least one item of position information (IP) of the actuator and an item of information relating to the powering down of the actuator (I), which assumes a first value (v) when the system has been powered down in a controlled manner and assuming assumes a second value (v) when the system has suffered a fault causing the current value of the position of the actuator stored in the volatile memory (RAM) to be deleted.

Method for controlling a system for a motor vehicle

The present invention relates to a method for controlling a thermal management device () of a motor vehicle comprising a refrigerant-fluid circuit comprising a compressor (), a first heat exchanger (), an expansion device () and the second heat exchanger (), said thermal management device () further comprising an electric heating device (), said control method involving, upon a starting of the thermal management device () from cold, the following steps: direct or indirect heating of the internal air flow () by the electrical heating device () alone until said internal air flow () reaches a target temperature and/or until a predetermined timer has run out, —when the internal air flow () has reached its target temperature and/or when the timer has run out, starting the compressor () so that the refrigerant-fluid circuit draws heat energy from the external air flow () at the second heat exchanger () and gives up said heat energy at the first heat exchanger ().

Method for controlling a thermal management device of a motor vehicle

A reversible thermal management device for a motor vehicle includes a refrigerant fluid circuit containing a main loop which has, successively, a compressor, an internal condenser, a first expansion device and an external evaporator/condenser. The device also has a three bypass branches. The third bypass branch has a heat exchanger. The device further includes a device for redirecting the refrigerant fluid coming from the internal condenser towards the first expansion device or the first bypass branch, a stop valve for the refrigerant fluid, arranged on the main loop, a first check valve arranged on the second bypass branch to block the refrigerant fluid coming from the internal condenser, a second check valve arranged on the main loop to block the refrigerant fluid coming from the evaporator/condenser, and a device for redirecting fluid coming from the first expansion device towards the heat exchanger of the third bypass branch or the evaporator/condenser.

Reversible thermal management device for a motor vehicle

Fluid circulation valve, the said valve comprising a housing () and a body () for circulation of fluid, the said body () being located at least partially within the said housing (), the said body () being attached to the housing () and having a passage () for fluid between the said body () and the said housing (), the said valve further comprising a control member () that can be actuated electromagnetically, the said control member () being able to move with respect to the said body () so as to selectively open or close the said passage (), the said body () having at least locally a tubular configuration at the said passage (), the said control member () being able to slide along the said body () at least at the said passage ().

Fluid circulation valve and thermal treatment system for a vehicle comprising such a valve

The invention relates to a refrigerant circuit for thermally conditioning a vehicle passenger compartment, comprising a plurality of branches containing at least one exchanger, of which branch a first branch is in series with a second branch and a third branch, said second branch being in parallel with said third branch, and a means of placing the third branch m communication with the second branch, said means being installed between a sector of the third branch which sector is situated downstream of an external exchanger and a portion of the second branch which is situated upstream of a first control member.

Refrigerant circuit and method of controlling such a circuit

A device for expanding a refrigerant fluid has a first inlet and a first outlet which are connected by a first refrigerant circulation duct. The first refrigerant circulation duct has an upstream part and a downstream part which parts are placed in communication by a first communication passage. The device also has a second inlet and a second outlet which are connected by a second refrigerant circulation duct. The device regulates an expansion of the refrigerant fluid and has a first needle valve housed inside the upstream part of the first refrigerant flow duct connected by a first connecting rod to a thermostatic sensor in communication with the second refrigerant flow duct that allows or prevents refrigerant fluid from circulating through the first communicating passage. The device also measures the pressure of the refrigerant fluid entering the evaporator (Pse) which pressure measurement is taken at the first outlet.

Thermostatic expansion device and air conditioning loop comprising such a thermostatic expansion device

A command device () includes a sensor () for the measurement of a measured value VM of a characteristic C of a fluid FR,A and a comparison () of the measured value VM of the characteristic C of the fluid FR,A with at least two step-values VSmin, VSmax of the characteristic C. The command device () includes an upstream temperature sensor () to be positioned upstream the evaporator () according to the air flow direction () to measure an upstream temperature Tof the air flow () and give an information () which is taken into account by the command device () in order to determine the step-values VSmin, VSmax of the characteristic C.

Device for controlling a fixed-capacity compressor

The invention proposes a pressure-reducing module for an air conditioning circuit () through which a supercritical refrigerant flows. The module is connected to the circuit via one inlet and two outlets. The module comprises a pressure-reducing device (), and a distribution valve () connected to the pressure-reducing device and to the two outlets. A dual evaporator circuit using such a pressure-reducing module is also proposed. The two evaporators () are mounted in parallel. The module receives the fluid coming from a gas cooler via its inlet and delivers the fluid to at least one of the two evaporators () via its outlets.

Pressure-reducing module for dual evaporator air conditioning system

An expansion device, intended for installation in an air conditioning system with a supercritical refrigerant fluid (FR), is described. The expansion device () comprises a body () through which refrigerant fluid passes, equipped with an inlet chamber () into which the refrigerant fluid arrives and an outlet chamber () through which the refrigerant fluid departs. The expansion device further comprises a set of expansion means to allow the refrigerant fluid to pass from the inlet chamber () to the outlet chamber (), comprising a variable expansion means () comprising a first orifice () and an adjusting screw () suitable for adjusting the flow section of the first orifice (); and, a fixed expansion means comprising a second orifice () with a fixed flow section.

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Conflans Sainte Honorine, France

Jin-Ming Liu