Thermal conditioning system

Abstract

The invention relates to a thermal conditioning system (100) for a motor vehicle, including: - a heat-transfer liquid circuit (20) including a primary loop (20A) and a secondary loop (20B); - a coolant circuit (10) including a compressor (29) and a first dual-fluid heat exchanger (1) which is configured to operate selectively as an evaporator or as a coolant cooler, wherein: - the primary loop (20A) comprises a second heat exchanger (2) thermally coupled to a first element (25) of an electric drivetrain of the vehicle; - the secondary loop (20B) comprises a third heat exchanger (3) thermally coupled to a second element (26) of the drivetrain, and a fourth heat exchanger (4) configured to exchange heat with an external air flow (Fe), and wherein the heat-transfer liquid circuit (20) includes a first bypass branch (20C) and a second bypass branch (20D).

Description

[0001] Description

[0002] Title: Thermal conditioning system

[0003] Technical field

[0004] [1] The present invention relates to the field of thermal conditioning systems. Such systems can, for example, be fitted to motor vehicles. These systems make it possible to ensure thermal regulation of various parts of the vehicle, such as the passenger compartment or an electrical energy storage battery, when the vehicle is electrically powered. Heat exchanges are managed mainly by the compression and expansion of a refrigerant circulating in a circuit in which several heat exchangers are arranged. A compressor delivers the refrigerant in a high-pressure state and allows circulation of the refrigerant in the circuit.

[0005] Prior art

[0006] [2] It is known to use carbon dioxide as a refrigerant, which makes it possible to limit to a minimum the global warming potential (GWP coefficient) of the refrigerant used. Various thermal conditioning systems adapted to operate with carbon dioxide as a refrigerant have been proposed. These systems can provide many different functions, depending on the heat exchangers in which the refrigerant can circulate, and depending on the expansion rate provided by each of the expansion devices upstream of these exchangers. Possible operating modes include heating the vehicle cabin and cooling it, as well as heating and cooling the electrical energy storage batteries. Another operating mode allows the cabin air to be dehumidified.

[0007] [3] For certain operating modes, the heat received by the refrigerant is dissipated into the outside air via a heat transfer fluid circulating in a closed circuit. The circulation of the heat transfer fluid in the various branches of the heat transfer fluid circuit makes it possible to achieve numerous operating modes, with multiple modes of heat transfer between the various components and exchangers of the vehicle.

[0008] [4] It is desirable to have operating modes adapted to the ambient temperature conditions and to the thermal power to be dissipated or received by the different components.

[0009] Summary [5] To this end, the present invention proposes a thermal conditioning system for a motor vehicle, comprising:

[0010] - a heat transfer fluid circuit comprising:

[0011] -- a primary heat transfer fluid circulation loop,

[0012] -- a secondary heat transfer fluid circulation loop,

[0013] - a refrigerant circuit comprising:

[0014] -- a compression device,

[0015] -- a first heat exchanger configured to operate selectively as a refrigerant evaporator or as a refrigerant cooler, the first heat exchanger being arranged jointly on the refrigerant circuit and on the primary heat transfer liquid loop so as to allow heat exchange between the refrigerant and the heat transfer liquid, in which:

[0016] - the primary loop of the heat transfer fluid circuit comprises a second heat exchanger configured to be thermally coupled to a first element of an electric drive train of the vehicle,

[0017] - the secondary loop of the heat transfer fluid circuit includes:

[0018] -- a third heat exchanger configured to be thermally coupled to a second element of the vehicle's electric powertrain, and

[0019] -- a fourth heat exchanger configured to exchange heat with an air flow outside the passenger compartment of the vehicle, and in which the heat transfer fluid circuit comprises:

[0020] - a first branch connection connecting a first connection point arranged on the primary loop between a first inlet / outlet of the second exchanger and a first inlet / outlet of the first exchanger to a second connection point arranged on the secondary loop between a first inlet / outlet of the third exchanger and a first inlet / outlet of the fourth exchanger,

[0021] - a second branch connection connecting a third connection point arranged on the secondary loop between a second inlet / outlet of the fourth exchanger and a second inlet / outlet of the third exchanger to a fourth connection point arranged on the primary loop between a second inlet / outlet of the first exchanger and a second inlet / outlet of the second exchanger.

[0022] [6] This heat transfer fluid circuit architecture allows for the optimization of heat exchanges within the refrigerant circuit. In addition, control of the thermal conditioning system is facilitated. [7] The characteristics listed in the following paragraphs can be implemented independently of each other or in any technically possible combination:

[0023] [8] The refrigerant circuit is configured to circulate a refrigerant.

[0024] [9] The compressor moves the refrigerant fluid from a low pressure state, at the compressor inlet, to a high pressure state, at the compressor outlet.

[0025]

[0010] The heat transfer fluid circuit is configured to circulate a heat transfer fluid.

[0026]

[0011] According to at least one mode of operation of the thermal conditioning system, the first heat exchanger operates as a refrigerant fluid cooler.

[0027]

[0012] According to at least one other mode of operation of the thermal conditioning system, the first heat exchanger operates as a refrigerant fluid evaporator.

[0028]

[0013] According to an exemplary embodiment, the first element of the electric powertrain of the vehicle comprises an electrical energy storage battery.

[0029]

[0014] Alternatively or additionally, the first element of the electric traction chain of the vehicle comprises an electric traction motor of the vehicle.

[0030]

[0015] The second heat exchanger allows heat to be exchanged between the first element of the vehicle's electric powertrain and the heat transfer fluid.

[0031]

[0016] The third heat exchanger allows heat to be exchanged between the second element of the vehicle's electric powertrain and the heat transfer fluid.

[0032]

[0017] According to one embodiment of the thermal conditioning system, the heat transfer liquid circuit comprises:

[0033] - a third branch connection connecting a fifth connection point arranged on the primary loop between the first inlet / outlet of the second exchanger and the first connection point to a sixth connection point arranged on the secondary loop between the second connection point and the first inlet / outlet of the fourth exchanger.

[0034]

[0018] According to another embodiment of the thermal conditioning system, the heat transfer liquid circuit comprises:

[0035] - a third branch connection connecting a fifth connection point arranged on the primary loop between the first inlet / outlet of the second exchanger and the first connection point to a sixth connection point arranged on the primary loop between the first connection point and the fifth connection point, the third branch connection comprising a fifth heat exchanger configured to exchange heat with the air flow outside the passenger compartment of the vehicle.

[0036]

[0019] The fifth exchanger makes it possible to increase the cooling capacity of the thermal conditioning system.

[0037]

[0020] The fifth exchanger is arranged upstream of the fourth exchanger in a direction of flow of the outside air flow.

[0038]

[0021] According to one embodiment of the thermal conditioning system, the heat transfer liquid circuit comprises:

[0039] - a fourth branch branch arranged in parallel with the third exchanger, the fourth branch branch connecting a seventh connection point arranged on the secondary loop between the first inlet / outlet of the third exchanger and the second connection point to an eighth connection point arranged on the secondary loop between the third connection point and the second inlet / outlet of the third exchanger.

[0040]

[0022] According to an exemplary embodiment of the thermal conditioning system, the heat transfer liquid circuit comprises a first three-way valve arranged jointly on the primary loop and on the third bypass branch, the first three-way valve is configured to distribute the flow of heat transfer liquid coming from the second exchanger between a first part circulating in the primary loop towards the first heat exchanger and a second part, complementary to the first part, circulating in the third bypass branch.

[0041]

[0023] The first part circulating in the primary loop towards the first heat exchanger can vary between 0% and 100% of the flow rate of heat transfer liquid coming from the second exchanger.

[0042] The second part, circulating in the third branch of the bypass, can jointly vary between 100% and 0% of the flow rate of heat transfer liquid coming from the second exchanger.

[0043]

[0024] According to one embodiment, the circulation in the third bypass branch allows the heat transfer liquid coming from the second exchanger to circulate towards the fourth heat exchanger.

[0044]

[0025] According to one embodiment, the circulation in the third bypass branch allows the heat transfer liquid coming from the second exchanger to circulate towards the fifth heat exchanger.

[0045]

[0026] According to an exemplary embodiment of the thermal conditioning system, the heat transfer liquid circuit comprises a second three-way valve arranged jointly on the secondary loop and on the first bypass branch, the second three-way valve is configured to distribute the flow of heat transfer liquid coming from the third exchanger between a first part circulating in the secondary loop towards the fourth exchanger and a second part, complementary to the first part, circulating in the first bypass branch.

[0046]

[0027] The first part circulating in the secondary loop towards the fourth heat exchanger can vary between 0% and 100% of the flow rate of heat transfer liquid coming from the third exchanger.

[0047] The second part circulating in the first branch of the bypass can jointly vary between 100% and 0% of the flow of heat transfer liquid coming from the third exchanger.

[0048]

[0028] According to an exemplary embodiment of the thermal conditioning system, the heat transfer liquid circuit comprises a third three-way valve arranged jointly on the secondary loop and on the fourth bypass branch, the third three-way valve is configured to distribute the flow of heat transfer liquid coming from the third exchanger between a first part circulating in the secondary loop towards the first bypass branch and a second part, complementary to the first part, circulating in the fourth bypass branch.

[0049]

[0029] The first part circulating in the secondary loop towards the first bypass branch can vary between 0% and 100% of the heat transfer liquid flow rate coming from the third exchanger.

[0050] The second part circulating in the fourth branch of the bypass can jointly vary between 100% and 0% of the flow of heat transfer liquid coming from the third exchanger.

[0051]

[0030] The primary loop of the heat transfer liquid circuit comprises a first circulation pump.

[0052]

[0031] The first circulation pump is arranged between the fourth connection point and a second inlet / outlet of the second exchanger.

[0053]

[0032] The first circulation pump is configured to circulate the heat transfer fluid from the fourth connection point to the fifth connection point.

[0054]

[0033] The first circulation pump is for example a unidirectional pump.

[0055]

[0034] The secondary loop of the heat transfer liquid circuit comprises a second circulation pump.

[0056]

[0035] The second circulation pump is arranged between the third connection point and a second inlet / outlet of the third exchanger.

[0036] The second circulation pump is arranged between the eighth connection point and the second inlet / outlet of the third exchanger.

[0057]

[0037] The second circulation pump is configured to circulate the heat transfer fluid from the third connection point to the second connection point.

[0058]

[0038] The second circulation pump is for example a unidirectional pump.

[0059]

[0039] According to one embodiment of the thermal conditioning system, the refrigerant circuit comprises: a main loop successively comprising, according to the direction of circulation of the refrigerant:

[0060] - a compressor,

[0061] -- a sixth heat exchanger thermally coupled with an interior air flow to a vehicle passenger compartment,

[0062] -- a first regulator,

[0063] -- a second regulator,

[0064] -- a seventh heat exchanger configured to exchange heat with an air flow outside the vehicle passenger compartment,

[0065] -- a refrigerant fluid accumulation device, a first bypass branch connecting a first connection point arranged on the main loop between the sixth exchanger and the first expansion valve to a second connection point arranged on the main loop downstream of the seventh exchanger and upstream of the accumulation device, the first bypass branch successively comprising a third expansion valve and the first heat exchanger arranged jointly on the heat transfer liquid circuit, a second bypass branch connecting a third connection point arranged on the main loop between the first expansion valve and the second expansion valve to a fourth connection point arranged on the main loop downstream of the seventh exchanger and upstream of the second connection point,the second bypass branch successively comprising a fourth expansion valve and an eighth heat exchanger configured to exchange heat with an interior air flow, a third bypass branch connecting a fifth connection point arranged on the first bypass branch downstream of the first exchanger and upstream of the second connection point to a sixth connection point arranged on the main loop between the third connection point and the second expansion valve.

[0040] According to an exemplary embodiment, the first bypass branch comprises a fifth expansion valve arranged between the fifth connection point and the second connection point.,

[0066]

[0041] According to one embodiment, the refrigerant circuit comprises: a fourth branch connection connecting a seventh connection point arranged on the main loop upstream of the first exchanger to an eighth connection point arranged on the first branch connection downstream of the third expansion valve and upstream of the first exchanger, the fourth branch connection comprising a sixth expansion valve.

[0067]

[0042] According to one embodiment, the refrigerant circuit comprises: a fifth bypass branch connecting a ninth connection point arranged on the main loop downstream of an outlet of the compressor and upstream of the sixth exchanger to a tenth connection point arranged on the main loop between the seventh heat exchanger and the accumulation device, the fifth bypass branch comprising a seventh expansion valve.

[0068]

[0043] According to one embodiment of the thermal conditioning system, the main loop comprises an internal exchanger configured to allow heat exchange between the refrigerant circulating between the first expansion valve and the second expansion valve and the refrigerant downstream of the accumulation device and upstream of an inlet of the compressor.

[0069]

[0044] The internal exchanger comprises a first heat exchange section arranged on the main loop between the third connection point and the sixth connection point, as well as a second heat exchange section arranged on the main loop downstream of the accumulator and upstream of an inlet of the compressor.

[0070]

[0045] The internal exchanger, also called internal heat exchanger, is configured to allow heat exchange between the refrigerant in the first heat exchange section and the refrigerant in the second heat exchange section.

[0071]

[0046] According to an exemplary embodiment, the sixth heat exchanger is configured to exchange heat with the air flow inside the passenger compartment of the vehicle.

[0072]

[0047] According to an alternative embodiment, the sixth heat exchanger is configured to exchange heat with a heat transfer liquid circulating in a closed heat transfer liquid circuit, the heat transfer liquid circuit comprising a heat exchanger configured to exchange heat with the air flow inside the passenger compartment of the vehicle.

[0048] Each expansion valve is for example an electronic expansion valve.

[0073]

[0049] The total flow rate of refrigerant circulating in the refrigerant circuit is equal to the flow rate of refrigerant discharged by the compressor.

[0074]

[0050] The main refrigerant loop comprises a first shutoff valve arranged upstream of the sixth exchanger.

[0075]

[0051] The first shut-off valve is arranged between the ninth connection point and the seventh connection point.

[0076]

[0052] The main refrigerant loop comprises a second shut-off valve arranged between the seventh exchanger and the fourth connection point.

[0077]

[0053] The main refrigerant loop comprises a second shutoff valve disposed between the tenth connection point and the fourth connection point.

[0078]

[0054] The first shut-off valve is an electrically operated valve. Similarly, the second shut-off valve is an electrically operated valve.

[0079]

[0055] The refrigerant circuit comprises a first one-way valve arranged on the main loop between the sixth exchanger and the first connection point.

[0080]

[0056] The first one-way valve is configured to allow circulation of refrigerant fluid through the first one-way valve of the sixth exchanger to the first connection point. The first one-way valve is also configured to prohibit circulation of refrigerant fluid through the first one-way valve of the first connection point to the sixth exchanger.

[0081]

[0057] The refrigerant circuit comprises a second one-way valve arranged on the third bypass branch.

[0082]

[0058] The second one-way valve is configured to allow circulation of refrigerant fluid through the second one-way valve from the fifth connection point to the sixth connection point and configured to prohibit circulation of refrigerant fluid through the second one-way valve from the sixth connection point to the fifth connection point.

[0083]

[0059] The refrigerant circuit comprises a third one-way valve arranged on the second bypass branch between the eighth exchanger and the fourth connection point.

[0060] The third one-way valve is configured to allow circulation of refrigerant through the third one-way valve from the eighth exchanger to the fourth connection point.

[0084]

[0061] The third one-way valve is also configured to prohibit circulation of refrigerant fluid through the third one-way valve from the fourth connection point to the eighth exchanger.

[0085]

[0062] The first one-way valve is for example a non-return valve.

[0086]

[0063] Similarly, the second one-way valve and the third one-way valve may also be a check valve.

[0087]

[0064] The invention also relates to a method of operating a thermal conditioning system as described previously, in a first mode called “passive cooling of the propellant and active cooling of the battery”, in which:

[0088] - a first flow of refrigerant fluid circulates in the compressor where it passes at high pressure, and circulates successively in the seventh exchanger where it gives off heat to the flow of outside air, in the second expansion valve, and is divided into:

[0089] - a second flow circulating successively in the fourth expander where it passes at a low pressure lower than the high pressure, in the eighth exchanger where it evaporates and receives heat from the internal air flow, and returns to the compressor,

[0090] - a third flow circulating successively in the first expander, in the third expander where it passes at low pressure, in the first exchanger where it evaporates and receives heat from the heat transfer liquid, and returns to the compressor,

[0091] - a first flow of heat transfer fluid circulates in the primary loop, successively in the second exchanger where it receives heat from the element of the traction chain, then in the first exchanger where it gives off heat to the refrigerant fluid, and joins the second exchanger,

[0092] - a second flow of heat transfer fluid circulates in the secondary loop, successively in the third exchanger where it receives heat from the second element, in the fourth exchanger where it gives off heat to the outside air flow, and joins the third exchanger.

[0093]

[0065] The invention also relates to a method of operating a thermal conditioning system as described previously, in a second mode called “first series dehumidification mode”, in which:

[0094] - a flow of refrigerant fluid circulates in the compressor where it passes at high pressure, and circulates successively in the sixth exchanger where it gives off heat to the internal air flow, in the third expansion valve where it passes at an intermediate pressure lower than the high pressure, in the first exchanger where it gives off heat to the heat transfer liquid, in the third branch branch, in the fourth expansion valve where it passes at a low pressure lower than the intermediate pressure, in the eighth exchanger where it evaporates and receives heat from the internal air flow, and returns to the compressor,

[0095] - a first flow of heat transfer fluid circulates in the primary loop, successively in the first exchanger where it receives heat from the refrigerant fluid, then in the second exchanger where it transfers heat to the first element of the traction chain,

[0096] - a second flow of heat transfer fluid circulates in the secondary loop, successively in the third exchanger where it receives heat from the second element, in the fourth exchanger where it gives off heat to the outside air flow, and joins the third exchanger.

[0097]

[0066] The invention also relates to a method of operating a thermal conditioning system according to the preceding claim, in a third mode called “second serial dehumidification mode”, in which:

[0098] - a flow of refrigerant fluid circulates in the compressor where it passes at high pressure, and circulates successively in the sixth exchanger where it gives off heat to the internal air flow, in the third expansion valve where it passes at an intermediate pressure lower than the high pressure, in the first exchanger where it gives off heat to the heat transfer liquid, in the third branch branch, in the fourth expansion valve where it passes at a low pressure lower than the intermediate pressure, in the eighth exchanger where it evaporates and receives heat from the internal air flow, and returns to the compressor,

[0099] - a first flow of heat transfer liquid circulates in the primary loop, in the second exchanger, then divides into:

[0100] -- a second flow circulating in the third branch of the diversion, and

[0101] -- a third flow circulating in the primary loop towards the first exchanger,

[0102] - a fourth flow of heat transfer liquid circulates in the secondary loop in the third exchanger, and is joined by the second flow circulating in the third bypass branch, forming a fifth flow of heat transfer liquid circulating in the secondary loop, in the fourth exchanger, and is divided into:

[0103] -- a sixth flow of heat transfer liquid circulating in the second bypass branch and joining the third flow of heat transfer liquid circulating in the primary loop, forming a seventh flow circulating in the primary loop,

[0104] - an eighth flow rate of heat transfer liquid circulating in the secondary loop in the third exchanger.

[0067] In steady state, the seventh flow rate of heat transfer liquid is equal to the first flow rate of heat transfer liquid.

[0105] Similarly, the eighth heat transfer fluid flow rate is equal to the fourth steady-state heat transfer fluid flow rate.

[0106]

[0068] The invention also relates to a method of operating a thermal conditioning system as described previously, in a fourth mode called “joint heating of the passenger compartment and battery by the propellant”, in which:

[0107] - a flow of refrigerant fluid circulates in the compressor where it passes at high pressure, and circulates successively in the sixth exchanger where it gives off heat to the internal air flow, in the third expansion valve where it passes at a low pressure lower than the high pressure, in the first exchanger where it evaporates and receives heat from the heat transfer liquid, and returns to the compressor,

[0108] - a first flow of heat transfer liquid circulates in the primary loop, in the second exchanger,

[0109] - a second flow of heat transfer liquid circulates in the secondary loop, in the third exchanger, then circulates in the first bypass branch and joins the first flow circulating in the primary loop, forming a third flow which circulates in the first exchanger then divides into:

[0110] -- a fourth flow circulating in the primary loop towards the second exchanger, and -- a fifth flow circulating in the secondary loop towards the third exchanger.

[0111]

[0069] The invention further relates to a method of operating a thermal conditioning system as described previously, in a fifth mode called “cabin cooling with active and passive cooling of the battery”, in which:

[0112] - a first flow of refrigerant fluid circulates in the compressor where it passes at high pressure, and circulates successively in the seventh exchanger where it gives off heat to the flow of outside air, in the second expansion valve, and is divided into:

[0113] -- a second flow circulating successively in the fourth expander where it passes at a low pressure lower than the high pressure, in the eighth exchanger where it evaporates and receives heat from the internal air flow, and returns to the compressor,

[0114] -- a third flow circulating successively in the first expander, in the third expander where it passes at low pressure, in the first exchanger where it evaporates and receives heat from the heat transfer liquid, and returns to the compressor,

[0115] - a first flow of heat transfer fluid circulates in the primary loop, in the second exchanger where it receives heat from the element of the traction chain, then circulates in the third branch of the bypass, in the fifth exchanger where it gives off heat to the flow of outside air, then joins the primary loop, circulates in the first exchanger and joins the second exchanger,

[0116] -- a second flow of heat transfer fluid circulates in the secondary loop, successively in the third exchanger where it receives heat from the second element, in the fourth exchanger where it gives off heat to the outside air flow, and joins the third exchanger.

[0117]

[0070] According to a variant in which the first three-way valve makes it possible to distribute the heat transfer liquid coming from the second element between a part circulating towards the first exchanger and a complementary part circulating in the third bypass branch, the heat transfer liquid is also cooled jointly by the fifth exchanger and by the first exchanger, and these two cooling operations this time occur in parallel.

[0118] Brief description of the drawings

[0119]

[0071] Other characteristics, details and advantages will appear on reading the detailed description below, and on analyzing the attached drawings, in which:

[0120]

[0072] [Fig. 1] is a schematic view of a thermal conditioning system according to a first embodiment of the invention,

[0121]

[0073] [Fig. 2] is a schematic view of a thermal conditioning system according to a variant of the embodiment of FIG. 1,

[0122]

[0074] [Fig. 3] represents a schematic view of a thermal conditioning system according to a second embodiment,

[0123]

[0075] [Fig. 4] represents a schematic view of a thermal conditioning system according to a variant of the embodiment of Figure 3,

[0124]

[0076] [Fig. 5] represents a schematic view of a thermal conditioning system according to a third embodiment,

[0125]

[0077] [Fig. 6] represents a schematic view of a thermal conditioning system according to a variant of the embodiment of Figure 5,

[0126]

[0078] [Fig. 7] represents a schematic view illustrating the operation of the thermal conditioning system of Figure 5, according to a first mode of operation,

[0127]

[0079] [Fig. 8] represents a schematic view illustrating the operation of the thermal conditioning system of Figure 5, according to a second mode of operation,

[0080] [Fig. 9] represents a schematic view illustrating the operation of the thermal conditioning system of Figure 5, according to a third mode of operation,

[0128]

[0081] [Fig. 10] represents a schematic view illustrating the operation of the thermal conditioning system of Figure 5, according to a fourth mode of operation,

[0129]

[0082] [Fig. 11] represents a schematic view illustrating the operation of the thermal conditioning system of Figure 5, according to a fifth mode of operation.

[0130] Description of the embodiments

[0131]

[0083] In order to facilitate the reading of the figures, the different elements are not necessarily represented to scale. In these figures, identical elements bear the same references. Certain elements or parameters may be indexed, that is to say designated for example by first element or second element, or first parameter and second parameter, etc. This indexing is intended to differentiate similar, but not identical, elements or parameters. This indexing does not imply a priority of one element or parameter over another. It is thus possible to interchange the names 'first', 'second', 'third', etc.

[0132]

[0084] In the following description, the term "a first element upstream of a second element" means that the first element is placed before the second element relative to the direction of circulation, or path, of a fluid. Similarly, the term "a first element downstream of a second element" means that the first element is placed after the second element relative to the direction of circulation, or path, of the fluid in question. In the case of the refrigerant circuit, the term "a first element is upstream of a second element" means that the refrigerant passes successively through the first element, then the second element, without passing through the compression device. In other words, the refrigerant leaves the compression device, possibly passes through one or more elements, then passes through the first element, then the second element, then returns to the compression device, possibly after passing through other elements.

[0133]

[0085] The expression "a second element is placed between a first element and a third element" means that the shortest path to go from the first element to the third element passes through the second element.

[0134]

[0086] When it is specified that a subsystem comprises a given element, this does not exclude the presence of other elements in this subsystem.

[0087] For the purposes of the present disclosure, the term “exchanger” is equivalent to the term “heat exchanger” and to the term “heat exchanger”. Similarly, the term “expander” is equivalent to the term “expansion device”, and the term “compressor” is equivalent to the term “compression device”.

[0135]

[0088] Each of the expansion devices used may be an electronic expansion valve, a thermostatic expansion valve, or a calibrated orifice. In the case of an electronic expansion valve, the passage section allowing the refrigerant to pass through can be continuously adjusted between a closed position and a maximum open position. For this, the system control unit drives an electric motor which moves a movable shutter controlling the passage section offered to the refrigerant.

[0136]

[0089] The thermal conditioning system 100 which will be described can equip a motor vehicle. An electronic control unit, not shown, receives information from various sensors measuring in particular the characteristics of the refrigerant fluid. The electronic control unit also receives instructions issued by the occupants of the vehicle, such as for example the desired temperature inside the passenger compartment. The electronic control unit implements control laws allowing the piloting of the various actuators, in order to ensure the control of the thermal conditioning system 100 so as to ensure the instructions received. A compression device makes it possible to circulate a refrigerant fluid in a closed refrigerant circulation circuit 10. The compression device can be an electric compressor, that is to say a compressor whose moving parts are driven by an electric motor.The compressor has a suction side for the low-pressure refrigerant, also called the compressor inlet, and a discharge side for the high-pressure refrigerant, also called the compressor outlet. The internal moving parts of the compressor move the refrigerant from low pressure on the inlet side to high pressure on the outlet side. After expansion in one or more expansion devices, the refrigerant returns to the compressor inlet and begins a new thermodynamic cycle.

[0137]

[0090] The refrigerant circuit 10 forms a closed circuit in which the refrigerant can circulate. The refrigerant circuit 10 is sealed when it is in a nominal operating state, that is to say without fault or leakage.

[0138]

[0091] Each connection point of the circuit 10 allows the refrigerant to pass into one or other of the portions of the circuit 10 joining at this connection point. The distribution of the refrigerant between the circuit portions joining at a connection point is done by adjusting the opening or closing of the stop valves, non-return valves or expansion devices included on each of these circuit portions. In other words, each connection point is a means of redirecting the refrigerant arriving at this connection point. Various stop valves and non-return valves thus make it possible to selectively direct the refrigerant into the different branches of the refrigerant circuit, in order to ensure different operating modes on demand, as will be described later.

[0139]

[0092] The thermal conditioning system 100 comprises a heat transfer liquid circuit 20. This heat transfer liquid circuit also forms a closed and sealed circuit in which a heat transfer liquid can circulate.

[0140]

[0093] The heat transfer fluid circuit 20 comprises different circulation loops, connected by bypass branches. The different circuit portions are connected to each other at various connection points. The distribution of the heat transfer fluid between the circuit portions joining at a connection point is achieved by opening or closing valves arranged in the circuit. In other words, each connection point is a means of redirecting the heat transfer fluid arriving at this connection point. The heat transfer fluid can thus be directed selectively into the different branches of the heat transfer fluid circuit, in order to ensure different operating modes on demand, as will also be described later.

[0141]

[0094] The refrigerant fluid used by the refrigerant circuit 10 is here a natural fluid, such as R744. It is also possible to use a chemical refrigerant fluid, such as R1234yf, or R134a.

[0142] The heat transfer fluid circulating in the circuit 20 is, for example, a mixture of water and glycol.

[0143]

[0095] Each refrigerant fluid expansion device, also called an expansion valve, may be an electronic expansion valve. In an electronic expansion valve, the passage section allowing the refrigerant fluid to pass through can be continuously adjusted between a closed position and a maximum open position. For this, an electronic expansion valve control module drives an electric motor which moves a movable shutter controlling the passage section offered to the refrigerant fluid. In the closed position, also called the closed position, the circulation of refrigerant fluid is interrupted, that is to say that the flow of refrigerant fluid passing through the electronic expansion valve is zero. In the maximum open position, the refrigerant fluid passes through the expansion valve without undergoing expansion.

[0096] The term interior air flow Fi means an air flow to the passenger compartment of the motor vehicle.This indoor air flow Fi can circulate in a heating, ventilation and / or air conditioning installation, frequently referred to by the English term "HVAC", for "Heating, Ventilating and Air Conditioning". This installation has not been shown in the various figures. A first motor-fan unit, also not shown, is arranged in the heating, ventilation and / or air conditioning installation in order to increase the flow rate of the indoor air flow Fi if necessary.

[0144]

[0097] Outside air flow Fe is understood to mean an air flow that is not intended for the passenger compartment of the vehicle. In other words, this air flow Fe remains outside the passenger compartment of the vehicle. A second motor-fan unit, not shown, can be activated in order to increase the flow rate of the outside air flow Fe if necessary. The air flow rate provided by the first as well as by the second motor-fan unit can be adjusted in real time according to the heat exchange requirements, for example by the electronic control unit of the thermal conditioning system 100.

[0145]

[0098] The term “first exchanger” is equivalent to the term “first heat exchanger”. Similarly, the term “internal exchanger” is equivalent to the term “internal heat exchanger”. The term “accumulation device” is equivalent to the term “refrigerant accumulation device”. The term “compression device” is equivalent to the term “compressor”.

[0146]

[0099] Figure 1 shows a thermal conditioning system 100 for a motor vehicle.

[0147] The thermal conditioning system 100 comprises a heat transfer fluid circuit 20 comprising:

[0148] - a 20A primary loop for circulating heat transfer fluid,

[0149] - a secondary loop 20B for circulating heat transfer fluid.

[0150] The thermal conditioning system 100 comprises a refrigerant circuit 10 comprising:

[0151] - a compressor 29,

[0152] - a first heat exchanger 1 configured to operate selectively as a refrigerant fluid evaporator or as a refrigerant fluid cooler, the first heat exchanger 1 being arranged jointly on the refrigerant fluid circuit 10 and on the primary heat transfer fluid loop 20A so as to allow heat exchange between the refrigerant fluid and the heat transfer fluid.

[0153] - The primary loop 20A of the heat transfer fluid circuit 20 comprises a second heat exchanger 2 configured to be thermally coupled to a first element 25 of an electric powertrain of the vehicle.

[0154] - The secondary loop 20B of the heat transfer fluid circuit 20 comprises:

[0155] -- a third heat exchanger 3 configured to be thermally coupled to a second element 26 of the electric powertrain of the vehicle, and

[0156] -- a fourth heat exchanger 4 configured to exchange heat with an outside air flow Fe to the passenger compartment of the vehicle.

[0157] The heat transfer fluid circuit 20 comprises:

[0158] - a first branch branch 20C connecting a first connection point 51 arranged on the primary loop 20A between a first inlet / outlet 2-1 of the second exchanger 2 and a first inlet / outlet 1-1 of the first exchanger 1 to a second connection point 52 arranged on the secondary loop 20B between a first inlet / outlet 3-1 of the third exchanger 3 and a first inlet / outlet 4-1 of the fourth exchanger 4,

[0159] - a second branch branch 20D connecting a third connection point 53 arranged on the secondary loop 20B between a second inlet / outlet 4-2 of the fourth exchanger 4 and a second inlet / outlet 3-2 of the third exchanger 3 to a fourth connection point 54 arranged on the primary loop 20A between a second inlet / outlet 1-2 of the first exchanger 1 and a second inlet / outlet 2-2 of the second exchanger 2.

[0160]

[0100] This heat transfer fluid circuit architecture makes it possible to optimize heat exchanges within the refrigerant fluid circuit. In addition, control of the thermal conditioning system is facilitated.

[0161]

[0101] The refrigerant circuit is configured to circulate a refrigerant.

[0162] The compressor 29 passes the refrigerant fluid from a low pressure state, at the inlet 29a of the compressor 29, to a high pressure state, at the outlet 29b of the compressor 29.

[0163]

[0102] The heat transfer liquid circuit 20 is configured to circulate a heat transfer liquid.

[0164]

[0103] According to at least one operating mode of the thermal conditioning system 100, the first heat exchanger 1 operates as a refrigerant fluid cooler.

[0165] In other words, according to this mode of operation the first exchanger 1 receives refrigerant at high pressure or medium pressure, and part of the heat of the refrigerant is transferred to the heat transfer liquid.

[0166]

[0104] According to at least one other mode of operation of the thermal conditioning system 100, the first heat exchanger 1 operates as a refrigerant evaporator. In this case, the first exchanger 1 receives refrigerant at low pressure, and the refrigerant evaporates by absorbing heat from the heat transfer liquid.

[0167]

[0105] According to an exemplary embodiment, the first element 25 of the electric traction chain of the vehicle comprises an electrical energy storage battery.

[0168]

[0106] Alternatively or additionally, the first element 25 of the electric traction chain of the vehicle comprises an electric traction motor of the vehicle.

[0169]

[0107] The second heat exchanger 2 makes it possible to carry out a heat exchange between the first element 25 of the electric drive train of the vehicle and the heat transfer liquid.

[0170]

[0108] The third heat exchanger 3 makes it possible to carry out a heat exchange between the second element 26 of the electric drive train of the vehicle and the heat transfer liquid.

[0171]

[0109] The second element 26 of the electric traction chain of the vehicle comprises for example an electronic unit for controlling the electric traction motor of the vehicle. The third exchanger 3 makes it possible in particular to cool the second element 26 of the traction chain, or to recover the heat dissipated by the second element 26 of the traction chain.

[0172]

[0110] According to the embodiment of the thermal conditioning system 100 illustrated in FIG. 1, the heat transfer liquid circuit 20 comprises a third branch branch 20E 1 connecting a fifth connection point 55 arranged on the primary loop 20A between the first inlet / outlet 2-1 of the second exchanger 2 and the first connection point 51 to a sixth connection point 56_1 arranged on the secondary loop 20B between the second connection point 52 and the first inlet / outlet 4-1 of the fourth exchanger 4.

[0173]

[0111] According to the variant of the thermal conditioning system 100 illustrated in FIG. 2, the heat transfer liquid circuit 20 comprises a third branch branch 20E 2 connecting a fifth connection point 55 arranged on the primary loop 20A between the first inlet / outlet 2-1 of the second exchanger 2 and the first connection point 51 to a sixth connection point 56_2 arranged on the primary loop 20A between the first connection point 51 and the fifth connection point 55, the third branch branch 20E 2 comprising a fifth heat exchanger 5 configured to exchange heat with the outside air flow Fe to the passenger compartment of the vehicle.

[0112] The fifth exchanger 5 makes it possible to increase the cooling capacity of the thermal conditioning system 100, by providing an additional source of heat dissipation.

[0174]

[0113] The fifth exchanger 5 is arranged upstream of the fourth exchanger 4 in a direction of flow of the outside air flow Fe.

[0175] The fifth exchanger 5 thus receives an air flow which has not been heated by any other heat exchanger.

[0176] The fourth exchanger 4 receives the air flow having previously passed through the fifth exchanger 5.

[0177]

[0114] The heat transfer liquid circuit 20 may comprise a fourth bypass branch 20F arranged in parallel with the third exchanger 3.

[0178] The fourth branch branch 20F connects a seventh connection point 57 arranged on the secondary loop 20B between the first inlet / outlet 3-1 of the third exchanger 3 and the second connection point 52 to an eighth connection point 58 arranged on the secondary loop 20B between the third connection point 53 and the second inlet / outlet 3-2 of the third exchanger 3.

[0179]

[0115] According to the example illustrated, the heat transfer liquid circuit 20 comprises a first three-way valve 23 arranged jointly on the primary loop 20A and on the third bypass branch 20E 1 , 20E 2.

[0180] The first three-way valve 23 is configured to distribute the flow of heat transfer liquid coming from the second exchanger 2 between a first part circulating in the primary loop 20A towards the first heat exchanger 1 and a second part, complementary to the first part, circulating in the third bypass branch 20E 1 , 20E 2.

[0181]

[0116] The first part circulating in the primary loop 20A towards the first heat exchanger 1 can vary between 0% and 100% of the flow rate of heat transfer liquid coming from the second exchanger 2.

[0182] The second part, circulating in the third branch of bypass 20E 1 , 20E 2 can jointly vary between 100% and 0% of the flow rate of heat transfer liquid coming from the second exchanger 2.

[0183] By "complementary" we mean that the sum of the first part and the second is equal to the initial flow, that is to say the flow coming from the second exchanger 2.

[0184]

[0117] This type of three-way valve makes it possible to distribute the flow of heat transfer liquid reaching a first channel between the other two channels. The flow rate can, for example, be adjusted continuously.

[0185] In a first position of the three-way valve, all the flow coming from the second exchanger 2 is directed towards the first exchanger 1, and the flow directed towards the third bypass branch 20E 1 , 20E 2 is zero.

[0186] In a second position of the three-way valve, all the flow coming from the second exchanger 2 is directed towards the third bypass branch 20E 1 , 20E 2, and the flow directed towards the first exchanger 1 is zero.

[0187] When moving from the first position to the second position, the flow directed towards the first exchanger 1 gradually decreases, and the flow directed towards the third bypass branch 20E 1 , 20E 2 increases simultaneously.

[0188]

[0118] According to the embodiment of FIG. 1, the circulation in the third bypass branch 20E 1 allows the heat transfer liquid coming from the second exchanger 2 to circulate towards the fourth heat exchanger 4.

[0189]

[0119] According to the embodiment variant of FIG. 2, the circulation in the third bypass branch 20E 2 allows the heat transfer liquid coming from the second exchanger 2 to circulate towards the fifth heat exchanger 5.

[0190]

[0120] According to the example illustrated, the heat transfer liquid circuit 20 comprises a second three-way valve 24 arranged jointly on the secondary loop 20B and on the first bypass branch 20C.

[0191] The second three-way valve 24 is configured to distribute the flow of heat transfer liquid coming from the third exchanger 3 between a first part circulating in the secondary loop 20B towards the fourth exchanger 4 and a second part, complementary to the first part, circulating in the first bypass branch 20C.

[0192]

[0121] The first part circulating in the secondary loop 20B towards the fourth heat exchanger 4 can vary between 0% and 100% of the flow rate of heat transfer liquid coming from the third exchanger 3.

[0193] The second part circulating in the first bypass branch 20C can jointly vary between 100% and 0% of the heat transfer liquid flow rate coming from the third exchanger 3.

[0194]

[0122] Like the first three-way valve 23, the second three-way valve 24 makes it possible to distribute the flow of heat transfer liquid reaching a first channel between the other two channels.

[0195] The distribution can vary continuously.

[0123] According to the example illustrated, the heat transfer liquid circuit 20 comprises a third three-way valve 27 arranged jointly on the secondary loop 20B and on the fourth bypass branch 20F.

[0196] The third three-way valve 27 is configured to distribute the flow of heat transfer liquid coming from the third exchanger 3 between a first part circulating in the secondary loop 20B towards the first bypass branch 20C and a second part, complementary to the first part, circulating in the fourth bypass branch 20F.

[0197]

[0124] The first part circulating in the secondary loop 20B towards the first bypass branch 20C can vary between 0% and 100% of the flow rate of heat transfer liquid coming from the third exchanger 3.

[0198] The second part circulating in the fourth branch of bypass 20F can jointly vary between 100% and 0% of the flow rate of heat transfer liquid coming from the third exchanger 3.

[0199]

[0125] As previously, the third three-way valve 27 makes it possible to distribute the flow of heat transfer liquid reaching one of its channels between the other two channels. This distribution can vary continuously.

[0200]

[0126] The fifth connection point 55 is part of the first three-way valve 23.

[0201] The second connection point 52 is part of the second three-way valve 24.

[0202] The seventh connection point 57 is part of the third three-way valve 27.

[0203]

[0127] According to variants not shown, two two-way valves can be used instead of a three-way valve.

[0204]

[0128] The primary loop 20A of the heat transfer liquid circuit 20 comprises a first circulation pump 21.

[0205] The first circulation pump 21 is arranged between the fourth connection point 54 and a second inlet / outlet 2-2 of the second exchanger 2.

[0206]

[0129] The first circulation pump 21 is here a unidirectional pump.

[0207] The first circulation pump 21 is configured to circulate the heat transfer liquid from the fourth connection point 54 to the fifth connection point 55.

[0208]

[0130] On the primary loop 20A, there are successively, according to the direction of circulation of the heat transfer liquid: the inlet 21 a of the first circulation pump 21, the outlet 21 b of the first circulation pump 21, the second inlet / outlet 2-2 of the second exchanger 2, the first inlet / outlet 2-1 of the second exchanger 2, the fifth connection point 55, the first connection point 51, the first inlet / outlet 1-1 of the first exchanger 1, the second inlet / outlet 1-2 of the first exchanger 1, the fourth connection point 54.

[0209]

[0131] According to the embodiment of FIG. 1, the secondary loop 20B of the heat transfer liquid circuit 20 comprises a second circulation pump 22.

[0210] The second circulation pump 22 is arranged between the third connection point 53 and a second inlet / outlet 3-2 of the third exchanger 3.

[0211]

[0132] According to the variant of figure 2, the second circulation pump 22 is arranged between the eighth connection point 58 and the second inlet / outlet 3-2 of the third exchanger 3.

[0212]

[0133] The second circulation pump 22 is for example a unidirectional pump. The second circulation pump 22 is configured to circulate the heat transfer liquid from the third connection point 53 to the second connection point 52.

[0213]

[0134] The first circulation pump 21 and the second circulation pump 22 are, for example, electrically controlled pumps.

[0214] Each of the pumps can be selectively turned on or off.

[0215] When a pump is deactivated, it does not circulate heat transfer fluid.

[0216]

[0135] On the secondary loop 20B, there are successively, according to the direction of circulation of the heat transfer liquid: the inlet 22a of the second circulation pump 22, the outlet 22b of the second circulation pump 22, the second inlet / outlet 3-2 of the third exchanger 3, the first inlet / outlet 3-1 of the third exchanger 3, the seventh connection point 57, the second connection point 52, the first inlet / outlet 4-1 of the fourth exchanger 4, the second inlet / outlet 4-2 of the fourth exchanger 4, the third connection point 53.

[0217]

[0136] Figures 3 and 4 represent a second embodiment, in which the refrigerant circuit 10 is fully represented.

[0218]

[0137] The refrigerant circuit 10 thus comprises: a main loop A comprising successively, according to the direction of circulation of the refrigerant:

[0219] - a compressor 29,

[0220] - a sixth heat exchanger 6 thermally coupled with an interior air flow Fi to a passenger compartment of the vehicle,

[0221] - a first regulator 31,

[0222] - a second expansion valve 32, -- a seventh heat exchanger 7 configured to exchange heat with an external air flow Fe to the passenger compartment of the vehicle,

[0223] -- a refrigerant fluid accumulation device 28, a first branch branch B connecting a first connection point 11 arranged on the main loop A between the sixth exchanger 6 and the first expansion valve 31 to a second connection point 12 arranged on the main loop A downstream of the seventh exchanger 7 and upstream of the accumulation device 28, the first branch branch B successively comprising a third expansion valve 33 and the first heat exchanger 1 arranged jointly on the heat transfer liquid circuit 20, a second branch branch C connecting a third connection point 13 arranged on the main loop A between the first expansion valve 31 and the second expansion valve 32 to a fourth connection point 14 arranged on the main loop A downstream of the seventh exchanger 7 and upstream of the second connection point 12,the second bypass branch C successively comprising a fourth expansion valve 34 and an eighth heat exchanger 8 configured to exchange heat with an interior air flow Fi, a third bypass branch D connecting a fifth connection point 15 arranged on the first bypass branch B downstream of the first exchanger 1 and upstream of the second connection point 12 to a sixth connection point 16 arranged on the main loop A between the third connection point 13 and the second expansion valve 32.,

[0224]

[0138] The eighth exchanger 8 is arranged in the heating, ventilation and / or air conditioning system of the vehicle.

[0225] The eighth exchanger 8 is arranged upstream of the sixth exchanger 6 in a direction of flow of the interior air flow Fi.

[0226]

[0139] The first branch branch B here comprises a fifth regulator 35 arranged between the fifth connection point 15 and the second connection point 12.

[0227]

[0140] According to the example illustrated, the main loop A comprises an internal exchanger 9 configured to allow heat exchange between the refrigerant circulating between the first expansion valve 31 and the second expansion valve 32 and the refrigerant downstream of the accumulation device 28 and upstream of an inlet 29a of the compressor 29.

[0228]

[0141] The internal exchanger 9 comprises a first heat exchange section 9a arranged on the main loop A between the third connection point 13 and the sixth connection point 16, as well as a second heat exchange section 9b arranged on the main loop A downstream of the accumulator 28 and upstream of an inlet 29a of the compressor 29.

[0229]

[0142] The internal exchanger 9, also called internal heat exchanger, is configured to allow heat exchange between the refrigerant fluid in the first heat exchange section 9a and the refrigerant fluid in the second heat exchange section 9b.

[0230]

[0143] The internal exchanger 9 makes it possible to increase the enthalpy variation of the refrigerant fluid during the thermodynamic cycle and therefore makes it possible to increase the performance of the system.

[0231]

[0144] In Figure 4, the heat transfer liquid circuit 20 is identical to the circuit of Figure 2.

[0232] In Figure 3, the heat transfer fluid circuit 20 is identical to the circuit of Figure 1, with the addition of a fourth branch 20F.

[0233]

[0145] Figures 5 and 6 illustrate a third embodiment in which the refrigerant circuit 10 comprises additional bypass branches.

[0234]

[0146] The refrigerant circuit 10 thus comprises a fourth branch branch E connecting a seventh connection point 17 arranged on the main loop A upstream of the first exchanger 1 to an eighth connection point 18 arranged on the first branch branch B downstream of the third expansion valve 33 and upstream of the first exchanger 1, the fourth branch branch E comprising a sixth expansion valve 36.

[0235]

[0147] The refrigerant circuit 10 comprises a fifth bypass branch F connecting a ninth connection point 19 arranged on the main loop A downstream of an outlet 7b of the compressor 29 and upstream of the sixth exchanger 6 to a tenth connection point 19' arranged on the main loop A between the seventh heat exchanger 7 and the accumulation device 28, the fifth bypass branch F comprising a seventh expansion valve 37.

[0236]

[0148] Each regulator is for example an electronic regulator.

[0237]

[0149] The thermal coupling between the sixth heat exchanger 6 and the interior air flow Fi can be achieved in different ways.

[0238]

[0150] According to the example illustrated in the various figures, the sixth heat exchanger 6 is configured to exchange heat with the interior air flow Fi in the passenger compartment of the vehicle.

[0151] The thermal coupling between the sixth heat exchanger 6 and the interior air flow Fi is in this case called direct. Indeed, the interior air flow Fi is in contact with the walls of the exchanger 6 in which the refrigerant circulates.

[0239] The sixth exchanger 6 is arranged in the heating, ventilation and / or air conditioning system of the vehicle.

[0240]

[0152] According to an alternative embodiment not illustrated, the sixth heat exchanger 6 is configured to exchange heat with a heat transfer liquid circulating in a closed heat transfer liquid circuit, and the heat transfer liquid circuit comprises a heat exchanger, called a passenger compartment heating radiator, configured to exchange heat with the air flow inside the passenger compartment of the vehicle.

[0241]

[0153] The thermal coupling between the sixth heat exchanger 6 and the interior air flow Fi is then said to be indirect. Indeed, the heat of the refrigerant fluid is dissipated in a heat transfer liquid, and the heat of the heat transfer liquid is in turn dissipated in the interior air flow Fi at the exchanger 1 A, called the heating radiator.

[0242] The heat transfer fluid thus allows heat transfer between the refrigerant fluid and the interior air flow Fi.

[0243]

[0154] The heat transfer liquid circuit 20 of Figure 6 is identical to the heat transfer liquid circuit of Figure 4. Similarly, the heat transfer liquid circuit 20 of Figure 5 is identical to the circuit of Figure 3.

[0244]

[0155] The refrigerant circuit 10 includes several one-way valves and shutoff valves, in order to selectively circulate the refrigerant in various parts of the circuit, depending on the desired operating mode for the thermal conditioning system 100.

[0245]

[0156] The main refrigerant loop A comprises a first shut-off valve 41 arranged upstream of the sixth exchanger 6.

[0246] When the refrigerant circuit 10 comprises the fifth bypass branch F and the fourth bypass branch E, the first shut-off valve 41 is arranged between the ninth connection point 19 and the seventh connection point 17.

[0247]

[0157] The main refrigerant loop A comprises a second shut-off valve 42 arranged between the seventh exchanger 7 and the fourth connection point 14.

[0248] When the refrigerant circuit 10 comprises the fifth bypass branch F, the main refrigerant loop A comprises a second shutoff valve 42 arranged between the tenth connection point 19' and the fourth connection point 14.

[0158] The first shutoff valve 41 is an electrically controlled valve. Similarly, the second shutoff valve 42 is an electrically controlled valve.

[0249] Each stop valve 41, 42 is for example controlled by the electronic control unit of the thermal conditioning system 100.

[0250] Depending on its electrical control status, each shut-off valve can selectively allow or prohibit the flow of refrigerant fluid between one inlet / outlet and the other inlet / outlet of that valve.

[0251]

[0159] The refrigerant circuit 10 comprises a first one-way valve 43 arranged on the main loop A between the sixth exchanger 6 and the first connection point 11.

[0252] The first one-way valve 43 is configured to allow circulation of refrigerant fluid through the first one-way valve 43 of the sixth exchanger 6 to the first connection point 11. The first one-way valve 43 is also configured to prohibit circulation of refrigerant fluid through the first one-way valve 43 of the first connection point 11 to the sixth exchanger 6.

[0253]

[0160] The refrigerant circuit 10 comprises a second one-way valve 44 arranged on the third bypass branch D.

[0254] The second one-way valve 44 is configured to allow circulation of refrigerant fluid through the second one-way valve 44 from the fifth connection point 15 to the sixth connection point 16. The second one-way valve 44 is also configured to prohibit circulation of refrigerant fluid through the second one-way valve 44 from the sixth connection point 16 to the fifth connection point 15.

[0255]

[0161] The refrigerant circuit 10 comprises a third one-way valve 45 arranged on the second bypass branch C between the eighth exchanger 8 and the fourth connection point 14.

[0256] The third one-way valve 45 is configured to allow circulation of refrigerant fluid through the third one-way valve 45 of the eighth exchanger 8 to the fourth connection point 14.

[0257] The third one-way valve 45 is also configured to prohibit circulation of refrigerant fluid through the third one-way valve 45 from the fourth connection point 14 to the eighth exchanger 8.

[0162] The first one-way valve 43 is for example a non-return valve.

[0258] Likewise, the second one-way valve 44 and the third one-way valve 45 may also be a check valve.

[0259] According to variants not shown, each one-way valve 43, 44, 45 can be replaced by an electrically controlled valve.

[0260]

[0163] The thermal conditioning system 100 can operate in several operating modes.

[0261] Some modes of operation are illustrated in Figures 7 to 11.

[0262] In these figures, the portions of the heat transfer liquid circuit 20 in which a flow of heat transfer liquid circulates are shown in continuous thick lines, while the portions in which the heat transfer liquid does not circulate are shown in double thin dotted lines. Different arrows indicate the direction of circulation of the heat transfer liquid in the different portions of the circuit 20.

[0263] Similarly, the portions of the circuit 10 in which a flow of refrigerant fluid circulates are shown in thick continuous lines, while the portions in which the refrigerant fluid does not circulate are shown in thin dotted lines. Different arrows indicate the direction of circulation of the refrigerant fluid in the different portions of the refrigerant circuit 10.

[0264]

[0164] Figure 7 shows a diagram of a method of operation of a thermal conditioning system 100 according to the third embodiment, illustrated in Figure 5.

[0265]

[0165] In this first mode of operation, called “passive cooling of the propellant and active cooling of the battery”:

[0266] - a first flow Qr1 of refrigerant fluid circulates in the compressor 29 where it passes at high pressure, and circulates successively in the seventh exchanger 7 where it gives off heat to the outside air flow Fe, in the second expansion valve 32, and is divided into:

[0267] - a second flow Qr2 circulating successively in the fourth expander 34 where it passes to a low pressure lower than the high pressure, in the eighth exchanger 8 where it evaporates and receives heat from the interior air flow Fi, and returns to the compressor 29,

[0268] - a third flow Qr3 circulating successively in the first expander 31, in the third expander 33 where it passes at low pressure, in the first exchanger 1 where it evaporates and receives heat from the heat transfer liquid, and returns to the compressor 29.

[0269] - a first flow Qc1 of heat transfer fluid circulates in the primary loop 20A, successively in the second exchanger 2 where it receives heat from the element 25 of the traction chain, then in the first exchanger 1 where it gives off heat to the refrigerant fluid, and joins the second exchanger 2.

[0270] - a second flow Qc2 of heat transfer liquid circulates in the secondary loop 20B, successively in the third exchanger 3 where it receives heat from the second element 26, in the fourth exchanger 4 where it gives off heat to the outside air flow Fe, and joins the third exchanger 3.

[0271]

[0166] The value of the so-called “high pressure” pressure, at the outlet of the compressor 29, is for example between 80 bars and 120 bars.

[0272] The value of the so-called “low pressure”, after expansion by the third regulator 33 and by the fourth regulator 34, is lower than the value of the high pressure.

[0273] Low pressure is for example between 35 bars and 45 bars.

[0274]

[0167] The total flow rate of refrigerant circulating in the refrigerant circuit 10 is equal to the flow rate of refrigerant discharged by the compressor 29. This total flow rate is the first flow rate Qr1.

[0275]

[0168] A flow of high-pressure, high-temperature refrigerant fluid circulates in the seventh exchanger 7, and dissipates part of its heat in the outside air flow Fe.

[0276] A flow of low-pressure refrigerant fluid circulates in parallel in the eighth exchanger 8 and the first exchanger 1. The eighth exchanger 8 and the first exchanger 1 both operate as evaporators.

[0277] The interior air flow Fi is cooled at the eighth exchanger 8.

[0278] The heat transfer fluid of the primary loop 20A is cooled by the evaporation of the refrigerant fluid at the level of the first exchanger 1, and thus receives so-called active cooling, i.e. managed by the evaporation of the refrigerant fluid.

[0279] The heat transfer fluid of the secondary loop 20B is cooled by the outside air flow Fe, which makes it possible to cool the second element 26 of the traction chain at the level of the third exchanger 3. This cooling is said to be passive, because it is managed by the outside air flow.

[0280]

[0169] The primary loop 20A and the secondary loop 20B are not connected together. The first three-way valve 23 directs the heat transfer liquid coming from the second exchanger 2 to the first exchanger 1, and blocks the circulation in the fourth bypass branch 20E 1.

[0281] The second three-way valve 24 directs the heat transfer fluid from the third exchanger 3 to the fourth exchanger 4, and blocks the circulation in the first bypass branch 20C.

[0282] The third three-way valve 27 directs the heat transfer fluid from the third exchanger 3 to the second connection point 52, and blocks the circulation in the fifth bypass branch 20F.

[0283]

[0170] The sixth exchanger 6 is not traversed by a flow of refrigerant fluid and is thermally inactive. The first heat exchange section 9a and the second heat exchange section 9b are both traversed by refrigerant fluid, the internal exchanger 9 is therefore active.

[0284]

[0171] Figure 8 shows a diagram of a method of operation of a thermal conditioning system 100 according to the third embodiment, illustrated in Figure 5.

[0285]

[0172] In this second operating mode called “first serial dehumidification mode”:

[0286] - a flow Qr of refrigerant fluid circulates in the compressor 29 where it passes at high pressure, and circulates successively in the sixth exchanger 6 where it gives off heat to the interior air flow Fi, in the third expansion valve 33 where it passes at an intermediate pressure lower than the high pressure, in the first exchanger 1 where it gives off heat to the heat transfer liquid, in the third bypass branch D, in the fourth expansion valve 34 where it passes at a low pressure lower than the intermediate pressure, in the eighth exchanger 8 where it evaporates and receives heat from the interior air flow Fi, and returns to the compressor 29.

[0287] - a first flow Qc1 of heat transfer fluid circulates in the primary loop 20A, successively in the first exchanger 1 where it receives heat from the refrigerant fluid, then in the second exchanger 2 where it transfers heat to the first element 25 of the traction chain.

[0288] - a second flow Qc2 of heat transfer liquid circulates in the secondary loop 20B, successively in the third exchanger 3 where it receives heat from the second element 26, in the fourth exchanger 4 where it gives off heat to the outside air flow Fe, and joins the third exchanger 3.

[0289]

[0173] The value of the so-called “intermediate” pressure, after expansion by the third regulator 33, is lower than the value of the high pressure and is higher than the value of the low pressure. The intermediate pressure is for example between 45 bars and 75 bars.

[0290]

[0174] A flow of high-pressure refrigerant fluid circulates in the sixth exchanger 6, and dissipates part of its heat in the interior air flow Fi, which makes it possible to heat this air flow.

[0291] The refrigerant fluid from the sixth exchanger 6 then passes at intermediate pressure, and gives off heat to the heat transfer fluid at the level of the first exchanger 1. The first exchanger 1 operates as a refrigerant fluid cooler.

[0292] The intermediate pressure, low temperature refrigerant is expanded by the fourth expansion valve 34 to a low pressure state and evaporates at the eighth exchanger 8. The interior air flow Fi is thus cooled.

[0293] The indoor air flow Fi is thus jointly cooled at the level of the eighth exchanger 8 and heated at the level of the sixth exchanger 6, and is therefore dehumidified.

[0294] The circulation of refrigerant fluid in the sixth exchanger 6 and the eighth exchanger 8 takes place in series, that is to say that all the flow coming from the sixth exchanger reaches the fourth expansion valve 34 then the eighth exchanger 8.

[0295] The excess heat produced is rejected into the heat transfer fluid of the primary heat transfer fluid loop 20A. The first element 25 of the drive train, for example the battery 25, can thus be heated. The air is thus dehumidified by utilizing the excess heat, i.e. by heating the first element 25 of the drive train rather than by dissipating heat into the outside air flow Fe. The battery can thus operate at a temperature close to its optimum temperature, thereby improving its efficiency.

[0296] The second element 26 of the traction chain is cooled thanks to the heat dissipated in the external air flow Fe at the level of the fourth exchanger 4.

[0297] Primary loop 20A and secondary loop 20B are not connected.

[0298] The circulation of heat transfer fluid in circuit 20 is identical to that of the first operating mode.

[0299] The second regulator 32, the fifth regulator 35 and the seventh regulator 37 are all three in the closed position.

[0300] The seventh exchanger 7 is not crossed by a flow of refrigerant fluid and is therefore thermally inactive.

[0301] The first heat exchange section 9a of the internal exchanger 9 and the second heat exchange section 9b are both traversed by refrigerant fluid, the internal exchanger 9 is therefore thermally active.

[0302]

[0175] Figure 9 shows a diagram of a method of operation of a thermal conditioning system 100 according to the third embodiment, illustrated in Figure 5.

[0303]

[0176] In this third mode called “second serial dehumidification mode”:

[0304] - a flow Qr of refrigerant fluid circulates in the compressor 29 where it passes at high pressure, and circulates successively in the sixth exchanger 6 where it gives off heat to the interior air flow Fi, in the third expansion valve 33 where it passes at an intermediate pressure lower than the high pressure, in the first exchanger 1 where it gives off heat to the heat transfer liquid, in the third bypass branch D, in the fourth expansion valve 34 where it passes at a low pressure lower than the intermediate pressure, in the eighth exchanger 8 where it evaporates and receives heat from the interior air flow Fi, and returns to the compressor 29.

[0305] - a first flow Qc1 of heat transfer liquid circulates in the primary loop 20A, in the second exchanger 2, then divides into:

[0306] -- a second flow Qc2 circulating in the third branch of derivation 20E 1, and

[0307] -- a third flow Qc3 circulating in the primary loop 20A towards the first exchanger 1.

[0308] - a fourth flow Qc4 of heat transfer liquid circulates in the secondary loop 20B in the third exchanger 3, and is joined by the second flow Qc2 circulating in the third bypass branch 20E 1 , forming a fifth flow of heat transfer liquid Qc5 circulating in the secondary loop 20B, in the fourth exchanger 4, and is divided into: -- a sixth flow Qc6 of heat transfer liquid circulating in the second bypass branch 20D and joining the third flow Qc3 of heat transfer liquid circulating in the primary loop 20A, forming a seventh flow Qc7 circulating in the primary loop 20A, -- an eighth flow Qc8 of heat transfer liquid circulating in the secondary loop 20B in the third exchanger 3.

[0309]

[0177] The first flow rate Qc1 of heat transfer liquid is the flow rate supplied by the first circulation pump 21, which is activated. The fourth flow rate Qc4 of heat transfer liquid is the flow rate supplied by the second circulation pump 22, which is activated.

[0310] In steady state, the seventh flow rate Qc7 of heat transfer fluid is equal to the first flow rate Qc1 of heat transfer fluid.

[0311] Similarly, the eighth flow rate Qc8 of heat transfer fluid is equal, in steady state, to the fourth flow rate Qc4 of heat transfer fluid.

[0312]

[0178] In steady state, the temporal variation of the mass of heat transfer liquid in a heat exchanger is zero, and the flow rate of heat transfer liquid at the outlet of an exchanger is equal to the flow rate of heat transfer liquid at the inlet of this exchanger.

[0313] Similarly, in steady state the temporal variation of the mass of refrigerant contained in a given heat exchanger is zero.

[0314]

[0179] In this operating mode, the first three-way valve 23 makes it possible to distribute the first flow Qc1 reaching one channel between its two other channels, thus forming the second flow Qc2 and the third flow Qc3.

[0315] The first flow Qc1 is divided at the first connection point 55. The fourth flow Qc4 and the second flow Qc2 join at the sixth connection point 56_1.

[0316] The fifth flow Qc5 is divided at the third connection point 53.

[0317] The sixth flow Qc6 and the third flow Qc3 meet at the fourth connection point 54.

[0318]

[0180] The circulation of refrigerant fluid is identical to the previous case. The excess heat is rejected into the heat transfer fluid of the primary loop. The third operating mode differs from the second operating mode in that the first element 25 of the traction chain, for example the battery 25, is already sufficiently hot and does not need to be heated.

[0319] A portion of the heat transfer fluid from the second exchanger 2 joins the heat transfer fluid from the third exchanger 3 and the resulting flow is directed to the fourth exchanger 4, where it is cooled by the outside air flow Fe. A portion Qc6 of the heat transfer fluid thus cooled joins the primary loop 20A, via the second bypass branch 20D, and joins the heat transfer fluid Qc3 from the first exchanger 1. The second exchanger 2 therefore receives a flow of heat transfer fluid, a portion of which has been cooled by the outside air at the fourth exchanger 4.

[0320] The air inside the passenger compartment is dehumidified, and the first element 25 of the powertrain can be jointly maintained at temperature or cooled.

[0321]

[0181] Figure 10 shows a diagram of a method of operation of a thermal conditioning system 100 according to the third embodiment, illustrated in Figure 5.

[0322]

[0182] In this fourth mode called “joint heating of passenger compartment and battery by the thruster”:

[0323] - a flow Qr of refrigerant fluid circulates in the compressor 29 where it passes at high pressure, and circulates successively in the sixth exchanger 6 where it gives off heat to the interior air flow Fi, in the third expansion valve 33 where it passes at a low pressure lower than the high pressure, in the first exchanger 1 where it evaporates and receives heat from the heat transfer liquid, and returns to the compressor 29.

[0324] - a first flow Qc1 of heat transfer liquid circulates in the primary loop 20A, in the second exchanger 2.

[0325] - a second flow Qc2 of heat transfer liquid circulates in the secondary loop 20B, in the third exchanger 3, then circulates in the first bypass branch 20C and joins the first flow Qc1 circulating in the primary loop 20A, forming a third flow Qc3 which circulates in the first exchanger 1 then divides into:

[0326] -- a fourth flow Qc4 circulating in the primary loop 20A towards the second exchanger 2, and -- a fifth flow Qc5 circulating in the secondary loop 20B towards the third exchanger 3.

[0327]

[0183] A flow Qr of high-pressure refrigerant fluid circulates in the sixth exchanger 6, and dissipates part of its heat in the interior air flow Fi, which makes it possible to heat the passenger compartment.

[0328] The refrigerant fluid then passes at low pressure, and receives heat from the heat transfer fluid at the first exchanger 1. The first exchanger 1 operates as a refrigerant fluid evaporator.

[0329] The seventh exchanger 7 and the eighth exchanger 8 are not crossed by the refrigerant fluid, and are thermally inactive.

[0330] Part of the heat dissipated by the operation of the second element 26 of the traction chain is transferred to the first element 25 of the traction chain.

[0331] Another part of the heat dissipated by the operation of the second element 26 of the traction chain is transferred to the refrigerant fluid at the level of the first exchanger 1. This mode of operation makes it possible to use the thermal losses linked to the operation of the second element 26 of the traction chain in order to heat the first element 25 of the traction chain as well as the passenger compartment of the vehicle.

[0332] The fourth exchanger 4 is not crossed by a flow of heat transfer liquid and is inactive.

[0333] The seventh exchanger 7 and the eighth exchanger 8 do not carry refrigerant fluid and are inactive.

[0334] The first circulation pump 21 and the second circulation pump 22 are both activated.

[0335] The first three-way valve 23 directs the heat transfer fluid coming from the second exchanger 2 to the first exchanger 1, and blocks the circulation in the fourth bypass branch 20E 1.

[0336] The second three-way valve 24 directs the heat transfer fluid from the third exchanger 3 to the first bypass branch 20C, and blocks the circulation in the secondary loop 20B to the fourth exchanger 4.

[0337] The third three-way valve 27 directs the heat transfer fluid from the third exchanger 3 to the second connection point 52, and blocks the circulation in the fifth bypass branch 20F.

[0338]

[0184] Figure 10 shows a diagram of a method of operation of a thermal conditioning system 100 according to the variant of the third embodiment illustrated in Figure 6.

[0185] In this fifth mode called “cabin cooling with active and passive cooling of the battery”:

[0339] - a first flow Qr1 of refrigerant fluid circulates in the compressor 29 where it passes at high pressure, and circulates successively in the seventh exchanger 7 where it gives off heat to the outside air flow Fe, in the second expansion valve 32, and is divided into:

[0340] -- a second flow Qr2 circulating successively in the fourth expander 34 where it passes to a low pressure lower than the high pressure, in the eighth exchanger 8 where it evaporates and receives heat from the interior air flow Fi, and returns to the compressor 29,

[0341] -- a third flow Qr3 circulating successively in the first expander 31, in the third expander 33 where it passes at low pressure, in the first exchanger 1 where it evaporates and receives heat from the heat transfer liquid, and returns to the compressor 29.

[0342] - a first flow Qc1 of heat transfer liquid circulates in the primary loop 20A, in the second exchanger 2 where it receives heat from the element 25 of the traction chain, then circulates in the third branch of derivation 20E 2, in the fifth exchanger 5 where it gives up heat to the flow of outside air Fe, then joins the primary loop 20A, circulates in the first exchanger 1 and joins the second exchanger 2.

[0343] - a second flow Qc2 of heat transfer liquid circulates in the secondary loop 20B, successively in the third exchanger 3 where it receives heat from the second element 26, in the fourth exchanger 4 where it gives off heat to the outside air flow Fe, and joins the third exchanger 3.

[0344]

[0186] A flow Qr1 of high-pressure, high-temperature refrigerant fluid circulates in the sixth exchanger 6, and dissipates part of its heat in the outside air flow Fe. A flow of low-pressure refrigerant fluid circulates in parallel in the seventh exchanger 7 and in the first exchanger 1. The seventh exchanger 7 and the first exchanger 1 both operate as refrigerant fluid evaporators.

[0345] The seventh exchanger 7 cools the interior air flow Fi, and the first exchanger 1 cools the heat transfer fluid of the primary loop 20A.

[0346] The heat transfer fluid Qc1 heated at the level of the second exchanger 2 by the thermal losses linked to the operation of the first element 25 of the traction chain is cooled at the level of the fifth exchanger 5 by the flow of external air Fe. This heat transfer fluid is then cooled again, at the level of the first exchanger 1, by the vaporization of the refrigerant fluid.

[0347] The heat transfer fluid circulating successively in a part of the primary loop 20A and in the third bypass branch 20E 2 is cooled jointly by the fifth exchanger 5 and by the first exchanger 1, these two coolings occurring in series. Indeed, the entire flow of heat transfer fluid passing through the second exchanger 2 then circulates in the fifth exchanger 5 then in the first exchanger 1.

[0348]

[0187] The heat transfer fluid circulating in the secondary loop 20B is cooled by the fourth exchanger 4.

[0349] Primary loop 20A and secondary loop 20B are not connected.

[0350] The first three-way valve 23 directs the heat transfer fluid from the second exchanger 2 to the third bypass branch 20E 2 and the fifth exchanger 5, and blocks the circulation in the primary loop 20A to the first exchanger 1.

[0351] The second three-way valve 24 directs the heat transfer fluid from the third exchanger 3 to the fourth exchanger 4, and blocks the circulation in the first bypass branch 20C.

[0352] The third three-way valve 27 directs the heat transfer fluid from the third exchanger 3 to the second connection point 52, and blocks the circulation in the fifth bypass branch 20F.

[0353]

[0188] According to a variant not shown in which the first three-way valve 23 distributes the heat transfer liquid coming from the second exchanger 2, coupled to the first element 25 of the traction chain, between a first part circulating towards the first exchanger 1 and a second complementary part circulating in the third bypass branch 20E 2, the heat transfer liquid is also cooled jointly by the fifth exchanger 5 and by the first exchanger 1, and these two joint coolings occur this time in parallel.

[0354] In fact, part of the flow of heat transfer liquid passing through the second exchanger 2 then circulates in the first exchanger 1 without circulating in the fifth exchanger 5. For this, the first three-way valve 23 directs part of the flow Qc1, coming from the second exchanger 2 and reaching the fifth connection point 55, towards the sixth connection point 56_2.

[0355]

[0189] Many other operating modes are of course possible.

Claims

Claims

1. Thermal conditioning system (100) for a motor vehicle, comprising: - a heat transfer fluid circuit (20) comprising: -- a primary loop (20A) for circulating heat transfer fluid, -- a secondary loop (20B) for circulating heat transfer fluid, - a refrigerant fluid circuit (10) comprising: -- a compressor (29), -- a first heat exchanger (1) configured to operate selectively as a refrigerant fluid evaporator or as a refrigerant fluid cooler, the first heat exchanger (1) being arranged jointly on the refrigerant fluid circuit (10) and on the primary heat transfer fluid loop (20A) so as to allow heat exchange between the refrigerant fluid and the heat transfer fluid, in which: - the primary loop (20A) of the heat transfer fluid circuit (20) comprises a second heat exchanger (2) configured to be thermally coupled to a first element (25) of an electric powertrain of the vehicle, - the secondary loop (20B) of the heat transfer liquid circuit (20) comprises: -- a third heat exchanger (3) configured to be thermally coupled to a second element (26) of the electric powertrain of the vehicle, and -- a fourth heat exchanger (4) configured to exchange heat with an external air flow (Fe) to the passenger compartment of the vehicle, and in which the heat transfer liquid circuit (20) comprises: - a first branch branch (20C) connecting a first connection point (51) arranged on the primary loop (20A) between a first inlet / outlet (2-1) of the second exchanger (2) and a first inlet / outlet (1-1) of the first exchanger (1) to a second connection point (52) arranged on the secondary loop (20B) between a first inlet / outlet (3-1) of the third exchanger (3) and a first inlet / outlet (4-1) of the fourth exchanger (4), - a second branch branch (20D) connecting a third connection point (53) arranged on the secondary loop (20B) between a second inlet / outlet (4-2) of the fourth exchanger (4) and a second inlet / outlet (3-2) of the third exchanger (3) to a fourth connection point (54) arranged on the primary loop (20A) between a second inlet / outlet (1-2) of the first exchanger (1) and a second inlet / outlet (2-2) of the second exchanger (2).

2. Thermal conditioning system (100) according to claim 1, wherein the heat transfer liquid circuit (20) comprises: - a third branch branch (20E 1 ) connecting a fifth connection point (55) arranged on the primary loop (20A) between the first inlet / outlet (2-1 ) of the second exchanger (2) and the first connection point (51 ) to a sixth connection point (56_1 ) arranged on the secondary loop (20B) between the second connection point (52) and the first inlet / outlet (4-1 ) of the fourth exchanger (4).

3. Thermal conditioning system (100) according to claim 1, wherein the heat transfer liquid circuit (20) comprises: - a third branch branch (20E 2) connecting a fifth connection point (55) arranged on the primary loop (20A) between the first inlet / outlet (2-1) of the second exchanger (2) and the first connection point (51) to a sixth connection point (56_2) arranged on the primary loop (20A) between the first connection point (51) and the fifth connection point (55), the third branch branch (20E 2) comprising a fifth heat exchanger (5) configured to exchange heat with the flow of air outside (Fe) to the passenger compartment of the vehicle.

4. Thermal conditioning system (100) according to one of the preceding claims, in which the heat transfer liquid circuit (20) comprises: - a fourth branch branch (20F) arranged in parallel with the third exchanger (3), the fourth branch branch (20F) connecting a seventh connection point (57) arranged on the secondary loop (20B) between the first inlet / outlet (3-1) of the third exchanger (3) and the second connection point (52) to an eighth connection point (58) arranged on the secondary loop (20B) between the third connection point (53) and the second inlet / outlet (3-2) of the third exchanger (3).

5. Thermal conditioning system (100) according to one of the preceding claims, wherein the heat transfer liquid circuit (20) comprises a first three-way valve (23) arranged jointly on the primary loop (20A) and on the third bypass branch (20E 1 , 20E 2), and wherein the first three-way valve (23) is configured to distribute the flow of heat transfer liquid coming from the second exchanger (2) between a first part circulating in the primary loop (20A) towards the first heat exchanger (1 ) and a second part, complementary to the first part, circulating in the third bypass branch (20E 1 , 20E 2).

6. Thermal conditioning system (100) according to one of the preceding claims, in which the heat transfer liquid circuit (20) comprises a second three-way valve (24) arranged jointly on the secondary loop (20B) and on the first bypass branch (20C), and in which the second three-way valve (24) is configured to distribute the flow of heat transfer liquid coming from the third exchanger (3) between a first part circulating in the secondary loop (20B) towards the fourth exchanger (4) and a second part, complementary to the first part, circulating in the first bypass branch (20C).

7. Thermal conditioning system (100) according to one of the preceding claims, wherein: - the primary loop (20A) of the heat transfer liquid circuit (20) comprises a first circulation pump (21), and - the secondary loop (20B) of the heat transfer liquid circuit (20) comprises a second circulation pump (22).

8. Thermal conditioning system (100) according to one of the preceding claims, in which the refrigerant circuit (10) comprises: a main loop (A) successively comprising, according to the direction of circulation of the refrigerant: - a compressor (29), - a sixth heat exchanger (6) thermally coupled with an interior air flow (Fi) to a passenger compartment of the vehicle, - a first regulator (31), - a second regulator (32), - a seventh heat exchanger (7) configured to exchange heat with an external air flow (Fe) to the passenger compartment of the vehicle, - a refrigerant fluid accumulation device (28), a first branch branch (B) connecting a first connection point (11) arranged on the main loop (A) between the sixth exchanger (6) and the first expansion valve (31) to a second connection point (12) arranged on the main loop (A) downstream of the seventh exchanger (7) and upstream of the accumulation device (28), the first branch branch (B) successively comprising a third expansion valve (33) and the first heat exchanger (1) arranged jointly on the heat transfer fluid circuit (20), a second branch branch (C) connecting a third connection point (13) arranged on the main loop (A) between the first expansion valve (31) and the second expander (32) to a fourth connection point (14) arranged on the main loop (A) downstream of the seventh exchanger (7) and upstream of the second connection point (12), the second bypass branch (C) successively comprising a fourth expander (34) and an eighth heat exchanger (8) configured to exchange heat with an interior air flow (Fi), a third bypass branch (D) connecting a fifth connection point (15) arranged on the first bypass branch (B) downstream of the first exchanger (1) and upstream of the second connection point (12) to a sixth connection point (16) arranged on the main loop (A) between the third connection point (13) and the second expander (32).

9. Thermal conditioning system (100) according to the preceding claim, wherein the refrigerant circuit (10) comprises: a fourth bypass branch (E) connecting a seventh connection point (17) arranged on the main loop (A) upstream of the first exchanger (1) to an eighth connection point (18) arranged on the first bypass branch (B) downstream of the third expansion valve (33) and upstream of the first exchanger (1), the fourth bypass branch (E) comprising a sixth expansion valve (36), a fifth bypass branch (F) connecting a ninth connection point (19) arranged on the main loop (A) downstream of an outlet (7b) of the compressor (29) and upstream of the sixth exchanger (6) to a tenth connection point (19') arranged on the main loop (A) between the seventh heat exchanger (7) and the accumulation device (28), the fifth bypass branch (F) comprising a seventh regulator (37),and in which the main loop (A) comprises an internal exchanger (9) configured to allow heat exchange between the refrigerant circulating between the first expander (31) and the second expander (32) and the refrigerant downstream of the accumulation device (28) and upstream of an inlet (29a) of the compressor (29).,

10. Method of operating a thermal conditioning system (100) according to claim 8 or 9, in a first mode called “passive cooling of the propellant and active cooling of the battery”, in which: - a first flow rate (Qr1) of refrigerant fluid circulates in the compressor (29) where it passes at high pressure, and circulates successively in the seventh exchanger (7) where it gives off heat to the flow of outside air (Fe), in the second expansion valve (32), and is divided into: -- a second flow (Qr2) circulating successively in the fourth regulator (34) where it passes to a low pressure lower than the high pressure, in the eighth exchanger (8) where it evaporates and receives heat from the interior air flow (Fi), and returns to the compressor (29), -- a third flow (Qr3) circulating successively in the first expander (31), in the third expander (33) where it passes at low pressure, in the first exchanger (1) where it evaporates and receives heat from the heat transfer liquid, and returns to the compressor (29), - a first flow (Qc1) of heat transfer fluid circulates in the primary loop (20A), successively in the second exchanger (2) where it receives heat from the element (25) of the traction chain, then in the first exchanger (1) where it gives off heat to the refrigerant fluid, and joins the second exchanger (2), -- a second flow (Qc2) of heat transfer liquid circulates in the secondary loop (20B), successively in the third exchanger (3) where it receives heat from the second element (26), in the fourth exchanger (4) where it gives off heat to the outside air flow (Fe), and joins the third exchanger (3).

11. A method of operating a thermal conditioning system (100) according to claim 8 or 9, in a second mode called "first serial dehumidification mode", in which: - a flow (Qr1) of refrigerant fluid circulates in the compressor (29) where it passes at high pressure, and circulates successively in the sixth exchanger (6) where it gives off heat to the interior air flow (Fi), in the third expansion valve (33) where it passes at an intermediate pressure lower than the high pressure, in the first exchanger (1) where it gives off heat to the heat transfer liquid, in the third bypass branch (D), in the fourth expansion valve (34) where it passes at a low pressure lower than the intermediate pressure, in the eighth exchanger (8) where it evaporates and receives heat from the interior air flow (Fi), and returns to the compressor (29), - a first flow (Qc1) of heat transfer fluid circulates in the primary loop (20A), successively in the first exchanger (1) where it receives heat from the refrigerant fluid, then in the second exchanger (2) where it transfers heat to the first element (25) of the traction chain, - a second flow (Qc2) of heat transfer liquid circulates in the secondary loop (20B), successively in the third exchanger (3) where it receives heat from the second element (26), in the fourth exchanger (4) where it gives off heat to the outside air flow (Fe), and joins the third exchanger (3).

12. A method of operating a thermal conditioning system (100) according to claim 8 or 9, in a third mode called "second serial dehumidification mode", in which: - a flow (Qr1) of refrigerant fluid circulates in the compressor (29) where it passes at high pressure, and circulates successively in the sixth exchanger (6) where it gives off heat to the interior air flow (Fi), in the third expansion valve (33) where it passes at an intermediate pressure lower than the high pressure, in the first exchanger (1) where it gives off heat to the heat transfer liquid, in the third bypass branch (D), in the fourth expansion valve (34) where it passes at a low pressure lower than the intermediate pressure, in the eighth exchanger (8) where it evaporates and receives heat from the interior air flow (Fi), and returns to the compressor (29), - a first flow (Qc1) of heat transfer liquid circulates in the primary loop (20A), in the second exchanger (2), then divides into: -- a second flow (Qc2) circulating in the third branch of the diversion (20E 1 ), and -- a third flow (Qc3) circulating in the primary loop (20A) towards the first exchanger (1), - a fourth flow (Qc4) of heat transfer liquid circulates in the secondary loop (20B) in the third exchanger (3), and is joined by the second flow (Qc2) circulating in the third bypass branch (20 E_1), forming a fifth flow of heat transfer liquid (Qc5) circulating in the secondary loop (20B), in the fourth exchanger (4), and is divided into: -- a sixth flow (Qc6) of heat transfer liquid circulating in the second bypass branch (20C) and joining the third flow (Qc3) of heat transfer liquid circulating in the primary loop (20A), forming a seventh flow (Qc7) circulating in the primary loop (20 A), - an eighth flow (Qc8) of heat transfer liquid circulating in the secondary loop (20B) in the third exchanger (3).

13. Method of operating a thermal conditioning system (100) according to claim 8 or 9, in a fourth mode called “joint heating of passenger compartment and battery by the propellant”, in which: - a flow (Qr1) of refrigerant fluid circulates in the compressor (29) where it passes at high pressure, and circulates successively in the sixth exchanger (6) where it gives off heat to the interior air flow (Fi), in the third expansion valve (33) where it passes at a low pressure lower than the high pressure, in the first exchanger (1) where it evaporates and receives heat from the heat transfer liquid, and returns to the compressor (29), - a first flow (Qc1) of heat transfer liquid circulates in the primary loop (20A), in the second exchanger (2), - a second flow (Qc2) of heat transfer liquid circulates in the secondary loop (20B), in the third exchanger (3), then circulates in the first bypass branch (20C) and joins the first flow (Qc1) circulating in the primary loop (20A), forming a third flow (Qc3) which circulates in the first exchanger (1) then divides into: -- a fourth flow (Qc4) circulating in the primary loop (20A) towards the second exchanger (2), and -- a fifth flow (Qc5) circulating in the secondary loop (20B) towards the third exchanger (3).

14. Method of operating a thermal conditioning system (100) according to claim 8 or 9, in a fifth mode called “cabin cooling with active and passive cooling of the battery”, in which: - a first flow (Qr1) of refrigerant fluid circulates in the compressor (29) where it passes at high pressure, and circulates successively in the seventh exchanger (7) where it gives off heat to the outside air flow (Fe), in the second expansion valve (32), and is divided into: -- a second flow (Qr2) circulating successively in the fourth expander (34) where it passes at a low pressure lower than the high pressure, in the eighth exchanger (8) where it evaporates and receives heat from the interior air flow (Fi), and returns to the compressor (29), -- a third flow (Qr3) circulating successively in the first expander (31), in the third expander (33) where it passes at low pressure, in the first exchanger (1) where it evaporates and receives heat from the heat transfer liquid, and returns to the compressor (29), - a first flow (Qc1) of heat transfer fluid circulates in the primary loop (20A), in the second exchanger (2) where it receives heat from the element (25) of the traction chain, then circulates in the third bypass branch (20E 2), in the fifth exchanger (5) where it gives off heat to the outside air flow (Fe), then joins the primary loop (20A), circulates in the first exchanger (1) and joins the second exchanger (2), -- a second flow (Qc2) of heat transfer liquid circulates in the secondary loop (20B), successively in the third exchanger (3) where it receives heat from the second element (26), in the fourth exchanger (4) where it gives off heat to the outside air flow (Fe), and joins the third exchanger (3).

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