Cooling system for a motor vehicle

Abstract

A cooling system for a motor vehicle comprises a first thermal management module (300) and a second thermal management module (500), wherein the first thermal management module (300) has a first refrigerant circuit (304) and the second thermal management module (500) has a second refrigerant circuit (505), wherein the first refrigerant circuit (304) has a first indirect condenser (303), a first chiller (301) and a second chiller (302) arranged in parallel to the first chiller (301), wherein the second refrigerant circuit (505) has a second indirect condenser (502) and a third chiller (501).

Description

Technical Field

[0001] The present invention relates to a cooling system for an electrically driven motor vehicle, particularly a truck, of the type according to the independent claims. Summary of the Invention

[0002] The objective of this invention is to design a cooling system for motor vehicles, particularly electric-driven trucks, so as to advantageously utilize the heat generated in the vehicle with minimal switching components and small space requirements, thereby ensuring energy-efficient heating of the cab.

[0003] Therefore, a cooling system for an electrically driven motor vehicle, as described in claim 1 and the dependent claims, is proposed herein.

[0004] The cooling system according to the present invention includes a first thermal management module having a first refrigerant circuit and a second thermal management module having a second refrigerant circuit. The first thermal management module having the first refrigerant circuit has a first indirect condenser, a first refrigerator, and a second refrigerator. The second thermal management module has a second indirect condenser and a third refrigerator.

[0005] A thermal management module is a structural unit that combines multiple components. In the solution according to the invention, the thermal management module has a refrigerant circuit, which, in addition to having at least one refrigerator and an indirect condenser, also has at least a compressor and possibly multiple expansion valves. Through structural integration within the thermal management module, a particularly compact and space-saving component can be obtained, which is easily arranged in the engine compartment of a motor vehicle.

[0006] A heat pump circuit based on the indirect principle can be realized with the help of a thermal management module. In the indirect condenser, the refrigerant releases heat to the cooling medium, while at the same time, in the refrigerator, heat is transferred from the cooling medium to the refrigerant.

[0007] In modern electric vehicles, refrigerants such as R290 (propane) or R774 (CO2) are used in such refrigerant circuits. However, other known refrigerants, such as R1234yf, can also be used.

[0008] Water can be used as a cooling medium, and water may contain antifreeze, or other suitable cooling media such as low-viscosity oil can be used.

[0009] Two independently operating refrigerant circuits allow for the appropriate supply of heat and cooling capacity in the vehicle as needed, depending on the operating conditions.

[0010] In another embodiment of the invention, the first cooler is connected to a cab cooling unit disposed in the cab. The cab cooling unit is used to cool the cab, for example, when the outside temperature is high, thus providing a comfortable climate for the driver.

[0011] Cooling systems are preferably used in cargo trucks, which are electrically driven and therefore contain batteries and electronic components to ensure operation. The cab is the central working position for the driver and must meet high requirements for cooling and heating to enable safe operation. The cab is also the driver's resting place, where the driver may sleep if necessary. Therefore, safe heating and cooling are essential for both safety and comfort. This functionality must be implemented particularly efficiently so that it does not significantly impact the cargo truck's mileage, for example, when there is no possibility of charging in parking lots, thus prioritizing the use of precious electrical energy for driving.

[0012] The cooling medium is cooled in the first refrigerator and then reaches the cab cooling body, through which air flows. Here, the air is cooled by the cooling medium. The cab cooling body is a heat exchanger, typically implemented as a finned tube heat exchanger. Fins are arranged between the tubes through which the cooled medium flows, and air flows through these fins. This allows for efficient heat exchange.

[0013] In another advantageous embodiment of the invention, the second and third coolers are connected to a battery cooling circuit. The battery cooling circuit is used to cool at least one battery by means of a cooling medium cooled in the second and / or third coolers.

[0014] Batteries in electric vehicles may emit significant amounts of heat, such as during charging or while driving, and this heat must be dissipated for proper battery function. Therefore, especially during fast charging, a large amount of heat can be generated in a very short time, requiring matched cooling power. By using two refrigerant circuits, a first and a second, which can operate independently of each other (for example, the second refrigerant circuit can be connected when cooling demand is very high), cooler cooling media from both refrigerant circuits can be provided through a second and a third refrigerant unit.

[0015] When the outside temperature is very low or during a cold start of the vehicle, it may be necessary to heat the battery to bring it to the required operating temperature as quickly as possible. For this purpose, an optional battery circuit heater can be installed in the battery cooling circuit, which uses additional heat input to bring the cooling medium to the required temperature, or in other words, to support the heating process.

[0016] In another advantageous embodiment of the invention, another cooler can be arranged in the second refrigerant circuit within the second thermal management module. A fourth cooler is arranged in parallel with the third cooler in the refrigerant circuit and is also supplied with refrigerant. This allows significantly more heat to be transferred from the cooling medium to the refrigerant, thereby providing a more thoroughly cooled cooling medium, particularly for cooling the battery circuit. Consequently, the cooling power can be advantageously increased again to provide a sufficiently cooled cooling medium at all times. Especially in battery-powered trucks, large batteries will be installed, which should be charged at higher power levels greater than 800 kW to 1000 kW. Therefore, a significant amount of heat loss may be dissipated during fast charging in the megawatt range, and this fast charging process may take some time due to the battery size.

[0017] In another advantageous embodiment of the invention, a second switching valve and a third switching valve are arranged before and after the third cooler. The second and third switching valves are switchable or adjustable, and can achieve, in particular, at least partial decoupling of the third cooler from the battery cooling circuit, while the second refrigerant circuit remains operational. If a fourth cooler is arranged in parallel with the third cooler, then the two coolers can thus be switched.

[0018] In another advantageous embodiment of the invention, the first indirect condenser has a first cooling medium outlet, and the second indirect condenser has a second cooling medium outlet. Here, the first and second cooling medium outlets are connected to a common heating circuit inlet line. In a particularly advantageous embodiment, a shut-off valve may be arranged between the heating circuit inlet line and the second cooling medium outlet.

[0019] By means of a shut-off valve, the second indirect condenser can be fluidly cut off when, for example, the second refrigerant circuit is shut off. This advantageously avoids flow losses that would otherwise occur in the second indirect condenser.

[0020] In another embodiment of the cooling system of the present invention, a first cooling medium cooler and a second cooling medium cooler can be arranged in the cooling system. The cooling medium cooler is a heat exchanger through which ambient air flows, which enables heat transfer between the cooling medium flowing in the cooling medium cooler and the ambient air. Here, heat can either be discharged to the environment or absorbed from the environment, and then this heat can be utilized in a heat pump. Here, the cooling medium cooler can, for example, apply ambient air by means of a fan when the vehicle is stationary.

[0021] A cab heating circuit can also be arranged in the cooling system, connected to the heating circuit inlet line. A first switching valve can be arranged in the heating circuit inlet line. The first switching valve can be designed as a three-way valve and can also be connected to the first cooling medium cooler via a supply line. The first switching valve can be designed to be switchable or adjustable, thus enabling precise distribution of the cooling medium heated in the first indirect condenser and / or the second indirect condenser.

[0022] In another embodiment of the invention, the cab heating circuit includes a first cab cooling medium pump and a cab high-voltage heater. A cab bypass valve may also be provided, which can connect the cab heating circuit bypass. The cooling medium can circulate in the cab heating circuit via the first cab cooling medium pump. When needed, the cab heating circuit bypass can be connected, allowing the cooling medium to circulate within a smaller loop. In this operating scenario, the cab high-voltage heater, preferably implemented as a liquid heater, can then heat the cooling medium for cab heating. Thus, an isolated cab heating circuit can be achieved without connection to the refrigerant circuit. This is advantageous, for example, when the vehicle is stationary during driver rest, in which case other vehicle cooling functions are not required. During cold starts, the cooling medium in the cab heating circuit is also heated by the cab high-voltage heater. Therefore, connecting the cab heating circuit bypass is also useful to prevent heat loss from the cab heating circuit to the outside.

[0023] However, another combination can be conceived in which the cab bypass valve only partially connects the cab heating circuit bypass, thus also mixing in the heat from the indirect condenser, so that the cab high-voltage heater acts as a heating aid in the cooling system.

[0024] In another embodiment of the invention, the cooling system includes an electronic device cooling circuit that can be connected to a second cooling medium cooler via a first electronic device circuit valve and a second electronic device circuit valve.

[0025] Therefore, the bypass of the electronic device circuit cooler, which has an electronic device circuit bypass valve, is arranged before the second cooling medium cooler. At least one electronic device assembly to be cooled is arranged in the electronic device cooling circuit. An electronic device circuit cooling medium pump can also be arranged in the electronic device cooling circuit for the circulation of the cooling medium.

[0026] The cooling medium circulates in the electronic device cooling circuit, thereby absorbing heat from at least one electronic device assembly to be cooled. The heated cooling medium can then be introduced into a second cooling medium cooler, where heat exchange with the environment can occur. If the heat demand is not high, an electronic device circuit cooler bypass can be established via an electronic device circuit bypass valve, allowing the cooling medium to bypass the second cooling medium cooler. In this way, the cooling medium can be slowly heated within the electronic device cooling circuit without heat loss to the environment. Therefore, under normal conditions, the electronic device assembly is cooled by the second cooling medium cooler.

[0027] In another embodiment of the invention, the cooling system includes a brake resistor cooling circuit. The brake resistor cooling circuit has a brake resistor and a brake resistor cooling medium pump. The brake resistor cooling circuit is connected to a second cooling medium cooler. In motor vehicles, especially in trucks, the brake resistor acts as a braking system to additionally brake the vehicle, for example, when driving downhill, in addition to the existing braking system or the regenerative capability of the drive motor. Here, the brake resistor converts kinetic energy into heat through mechanical work or also through electronic resistance. This heat then enters the brake resistor cooling circuit and is guided by the brake resistor cooling medium pump through the second cooling medium cooler, where the heat can be transferred to the ambient air.

[0028] In another embodiment of the invention, the cooling system has a third cooling medium cooler. The third cooling medium cooler may be configured solely for cooling the braking resistor cooling circuit, so that the waste heat of the braking resistor can be directed only through the third cooling medium cooler by means of the braking resistor cooling medium pump and cooled there by ambient air.

[0029] In an advantageous embodiment, the first and second electronic device circuit valves are arranged before and after the second cooling medium cooler. These electronic device circuit valves can be designed as three-way valves, thus allowing for flexible control or regulation of the cooling medium. This allows the flow of cooling medium from the electronic device cooling circuit to be disconnected when the brake resistor cooling circuit is connected to the second cooling medium cooler by activating the brake resistor cooling medium pump. To still cool the cooling medium from the electronic device cooling circuit, the first and second electronic device circuit valves can direct the cooling medium to the first cooling medium cooler, thus allowing heat to still be released to the ambient air.

[0030] Therefore, the first and second cooling medium coolers can be advantageously connected in terms of fluidity, so that the cooling medium can flow through the two cooling medium coolers in parallel.

[0031] In another advantageous embodiment of the invention, a fourth switching valve is arranged in the cab heating circuit return flow, which allows the cooling medium to flow back from the cab heating circuit. The fourth switching valve enables the cab heating circuit return flow to be connected to the condenser inlet flow, wherein the condenser inlet flow guides the cooling medium from the first cooling medium cooler back to the first and second indirect condensers.

[0032] The first cooling medium cooler cools the two indirect condensers of the first and second thermal management modules during normal operation. They are dual-configured to handle the very high power demands that may arise during uphill driving under very high loads or during megawatt-level charging. Furthermore, they allow for energy-optimized operation because the supply temperature can be set accordingly for the cab and battery. For this purpose, for example, a first switching valve can distribute the heated cooling medium from the indirect condenser to the cab heating circuit.

[0033] The first cooler, located in the first thermal management module, cools the cab, while the second cooler supports battery cooling when needed. The third cooler, located in the second thermal management module, is used solely for battery cooling during normal operation.

[0034] In another advantageous embodiment of the invention, the cooling circuit is arranged in the vehicle, particularly in a truck equipped with a battery and an electric drive system. Attached Figure Description

[0035] Other advantageous embodiments and inventive features of the invention are illustrated in the following description and accompanying drawings. In the figures:

[0036] Figure 1 A schematic diagram of the cooling system of the present invention, which incorporates a heat pump, is shown.

[0037] Figure 2 A schematic diagram of the cooling system of the present invention without a heat pump is shown;

[0038] Figure 3 A partial view of the cooling system of the present invention is shown, which has a total of 4 coolers;

[0039] Figure 4 A partial view of the cooling system of the present invention is shown, which has three cooling medium coolers. Detailed Implementation

[0040] Figure 1 A schematic structure of the cooling system 1 of the present invention in a motor vehicle 2 is shown.

[0041] Cooling system 1 includes an electronic device cooling circuit 400 through which a cooling medium flows. Water, which may contain antifreeze, can be used as the cooling medium, or other suitable cooling media, such as low-viscosity oil, can also be used.

[0042] The electronic device cooling circuit 400 includes electronic device components 401, which can be connected in parallel and / or in series and cooled by a cooling medium. Electronic device components 401 may be, for example, a drive motor of the vehicle 2, power electronics in the vehicle 2, a current converter for example for the charging process, or other components that have cooling requirements during operation and can release heat. The electronic device cooling circuit 400 is connected to a second cooling medium cooler 202, which may be arranged in the cooling module 200. An electronic device circuit cooling medium pump 402 is also arranged in the electronic device cooling circuit 400 for circulating the cooling medium within the electronic device cooling circuit 400.

[0043] The cooling module 200 is preferably located in the front region of the vehicle 2 and is capable of utilizing ambient airflow. The ambient air can absorb heat from the cooling medium flowing through the second cooling medium cooler 202 and discharge it into the ambient air, or it can absorb heat from the environment.

[0044] The cooling module 200 includes a first cooling medium cooler 201 and a fan 203. The first cooling medium cooler 201 is also circulated by a cooling medium and can exchange heat with the environment.

[0045] In the electronic device cooling circuit 400, the electronic device circuit cooler bypass 403 with electronic device circuit bypass valve 404 is arranged before the second cooling medium cooler 202. The electronic device circuit bypass valve 404 can bypass the second cooling medium cooler 202 completely or at least partially, so that the cooling medium does not flow through or only partially flows through the second cooling medium cooler 202.

[0046] A braking resistor 10 is arranged in the vehicle 2, which can provide auxiliary braking in the vehicle. Here, kinetic energy is converted into heat that must be dissipated. This can be used, for example, as an auxiliary braking force when driving downhill, when the vehicle brakes and regeneration through the drive motor are insufficient to safely brake the vehicle. To cool the braking resistor 10, it can be integrated into the electronic device cooling circuit 400, so that the activated braking resistor cooling medium pump 11 can guide the cooling medium through the second cooling medium cooler 202 to cool the cooling medium.

[0047] The electronic device cooling circuit 400 includes a first electronic device circuit valve 405 and a switchable second electronic device circuit valve 406 at the inlet and outlet points leading to the second cooling medium cooler 202 to achieve different switching processes. Here, for example, during active cooling of the braking resistor, the second cooling medium cooler 202 can be switched in isolation only for this cooling situation, and additional cooling of the electronic device circuit 400 can be achieved through the first cooling medium cooler 201.

[0048] Cooling system 1 includes a battery cooling circuit 600 through which a cooling medium flows. At least one battery 601 is arranged in the battery cooling circuit 600, configured to supply energy to the vehicle 1 and, for example, to the drive motor and all other electrical components in the vehicle 2. The battery cooling circuit 600 has a battery circuit cooling medium pump 602 responsible for circulating the cooling medium within the battery cooling circuit 600. The battery cooling circuit 600 may also have a battery circuit heater 603 adapted to introduce heat into the battery cooling circuit 600 by means of electrical energy, so as to rapidly bring the battery 601 to a desired temperature, especially in colder external temperatures.

[0049] Motor vehicle 2 has a driver's cab 100, which must be heated or cooled. For this purpose, a driver's cab radiator 101 and a driver's cab cooling unit 102 are arranged in the driver's cab 100, through which air can flow. The driver's cab radiator 101 heats the driver's cab 100, and when heating is required, a warm cooling medium flows through the driver's cab radiator 101, thus heating the air flowing into the driver's cab 100. The driver's cab cooling unit 102 cools the driver's cab 100, and when cooling is required, a cold cooling medium flows through the driver's cab cooling unit 102, thus cooling the air flowing into the driver's cab 100. Here, for dehumidifying the incoming air, the two heat exchangers 101 and 102 arranged in the driver's cab 100 can also be in operation.

[0050] To support heated operation, a cab high-voltage heater 104 can be arranged before the cab radiator 101. A cab heating circuit bypass 106 with a cab bypass valve 107 enables bypassing and thus a smaller heating circuit. For this purpose, a first cab cooling medium pump 103 can be provided, which operates this smaller heating circuit when the cab high-voltage heater 104 is running, thus enabling heating of the cab 100 independently of other heat sources.

[0051] The cooling system 1 includes a first thermal management module 300 and a second thermal management module 500.

[0052] Thermal management modules 300 and 500 are understood as structural units of different components, including at least one refrigerant circuit, a compressor, an indirect condenser, and a refrigerator. Here, the indirect condenser, compressor, and refrigerator are integrated into a refrigeration circuit. R290 (propane) can be used as the refrigerant; however, other known refrigerants can also be used. Preferably, these components are arranged, for example, on a module support, which particularly preferably also includes fluid conduits and other components such as expansion valves and sensors, and are combined into a structural unit that can be arranged in vehicle 2. The indirect condenser is a heat exchanger through which a cooling medium and refrigerant can exchange heat. Preferably, the indirect condenser dissipates heat to the cooling medium.

[0053] It can also be envisioned that, if the space conditions in the motor vehicle 2 allow, the first thermal management module 300 and the second thermal management module 500 together form a structural unit.

[0054] The first thermal management module 300 includes a first cooler 301 and a second cooler 302, which are integrated in parallel in a refrigeration circuit. Furthermore, the first thermal management module 300 includes a first indirect condenser 303.

[0055] The thermal management module 500 includes a third cooler 501, a second indirect condenser 502, and a shut-off valve 503, which cuts off the backflow to the second indirect condenser 502, preventing the cooling medium from flowing through it. This is necessary when using lower levels of battery waste heat as a heat source for the heat pump.

[0056] The first indirect condenser 303 and the second indirect condenser 502 are circulated by a cooling medium and are arranged in parallel with each other. A condenser cooling medium pump 504 may be arranged upstream of these indirect condensers 303 and 502.

[0057] The electronic device cooling circuit 400, the battery cooling circuit 600, and the cooling medium line leading to the cab heat sink can be connected to each other in different ways using switching valves 700, 701, 702, and 703. These switching valves can be implemented as adjustable three-way or four-way switching valves.

[0058] The two indirect condensers 303 and 502 of the first thermal management module 300 and the second thermal management module 500 can be switched as heat sources for the cab radiator 101 via the first switching valve 700 and the fourth switching valve 703. If the amount of cooling medium in the indirect condensers 303 and 502 is too large for the cab radiator 101, it is advantageous that at least the first switching valve 700 and / or the fourth switching valve 703 are adjustable.

[0059] Under normal conditions, the first thermal management module 300 and the second thermal management module 500 utilize the battery 601 as a heat source. If the waste heat from the battery 601 is insufficient as a heat source, for example, under light load operation, the second switching valve 701 and the third switching valve 702 can be used to connect the electronic device cooling circuit 400 to the third cooler 501 of the second thermal management module 500 instead of the battery 601.

[0060] Figure 2 Another embodiment of the cooling system 1 according to the invention is shown. In the illustrated embodiment, some switching valves are omitted, thus simplifying the construction. Here, in particular, the electronic circuit 400 is directly connected to the cab heating circuit 108, so that heat from the electronic circuit 400 can be directly used for heating the cab 100 through the cab radiator 101. In order to achieve adequate heating of the cab 100 even when the cooling medium temperature is low, such as during the cold start phase of the vehicle 2, an additional cab air heater 110 can be provided, which directly electrically heats the incoming air, thus supporting the heating of the cab 100. In the illustrated embodiment, the first, second, third, and fourth switching valves 700, 701, 702, and 703 for connecting / regulating the various cooling circuits to each other are also omitted. This allows for a particularly cost-effective structure of the cooling system 1, which, while omitting some adjustment options and thus efficiency possibilities, achieves the basic functions of the cooling system 1.

[0061] Figure 3 Another embodiment of the cooling system 1 according to the invention is shown, wherein only a portion of the first thermal management module 300 and the second thermal management module 500 is shown. In addition to the two first coolers 301 and 302 arranged in the first thermal management module 300, the illustrated embodiment also has two coolers 501, 507 arranged in parallel in the refrigerant circuit 505 in the second thermal management module 500. Thus, the cooling power for the battery circuit 600 can be advantageously increased again to provide a sufficiently cooled cooling medium at all times. Especially in battery-electric trucks, large batteries will be installed, which should be charged at higher power than 800 kW to 1000 kW. Therefore, a large amount of heat loss may be dissipated during fast charging in the megawatt range, and this fast charging process lasts for some time due to the battery size.

[0062] Figure 4Another embodiment of the cooling system 1 according to the invention is shown, wherein a third cooling medium cooler 204 is arranged, which is configured solely for cooling the braking resistor 10. This forms a braking resistor cooling circuit 12, in which the cooling medium is circulated by means of a braking resistor cooling medium pump 11. Here, the heat generated in the braking resistor 10 is discharged to the environment through the third cooling medium cooler 204. Thus, the first and second cooling medium coolers 201, 202 can be used in isolation for waste heat from the battery circuit 600 and the electronic device circuit 400, or for waste heat from the two indirect condensers 303, 502.

[0063] List of reference numerals

[0064] 1 Cooling System

[0065] 2 Motor vehicles

[0066] 10 Braking Resistor

[0067] 11 Braking resistor cooling medium pump

[0068] 12. Braking resistor cooling circuit

[0069] 100 driver's cab

[0070] 101 Cab Radiator

[0071] 102 Cab Cooling Unit

[0072] 103 First cab cooling medium pump

[0073] 104 High-voltage heater for driver's cab

[0074] 105 Second cab cooling medium pump

[0075] 106 Cab heating circuit bypass

[0076] 107 Cab Bypass Valve

[0077] 108 Cab Heating Circuit

[0078] 109 Cab heating circuit return

[0079] 110 Cab Air Heater

[0080] 200 Cooling Module

[0081] 201 First Cooling Medium Cooler

[0082] 202 Second Cooling Medium Cooler

[0083] 203 Fan

[0084] 204 Third Cooling Medium Cooler

[0085] 300 First Thermal Management Module

[0086] 301 First Refrigerator

[0087] 302 Second Refrigerator

[0088] 303 First Indirect Condenser

[0089] 304 First Refrigerant Circuit

[0090] 400 Electronic Component Cooling Circuit

[0091] 401 Electronic Components

[0092] 402 Electronic Device Circuit Cooling Medium Pump

[0093] 403 Electronic Device Circuit Cooler Bypass

[0094] 404 Electronic Component Circuit Bypass Valve

[0095] 405 First Electronic Device Circuit Valve

[0096] 406 Second Electronic Component Circuit Valve

[0097] 407 Heating circuit inlet line

[0098] 408 First Cooling Medium Outlet

[0099] 409 Second Cooling Medium Outlet

[0100] 500 Second Thermal Management Module

[0101] 501 Third Refrigerator

[0102] 502 Second Indirect Condenser

[0103] 503 shut-off valve

[0104] 504 condenser cooling medium pump

[0105] 505 Second Refrigerant Circuit

[0106] 506 Condenser Inlet

[0107] 507 Fourth Refrigerator

[0108] 600 Battery Cooling Circuit

[0109] 601 battery

[0110] 602 Battery Circuit Cooling Medium Pump

[0111] 603 Battery Circuit Heater

[0112] 700 First switching valve

[0113] 701 Second Switching Valve

[0114] 702 Third Switching Valve

[0115] 703 Fourth Switching Valve

Claims

1. A cooling system (1) for a motor vehicle (2), the cooling system comprising a first thermal management module (300) and a second thermal management module (500), wherein, The first thermal management module (300) has a first refrigerant circuit (304), and the second thermal management module (500) has a second refrigerant circuit (505). The first refrigerant circuit (304) has a first indirect condenser (303), a first refrigerator (301), and a second refrigerator (302) arranged in parallel with the first refrigerator (301). The second refrigerant circuit (505) has a second indirect condenser (502) and a third refrigerator (501).

2. The cooling system (1) for a motor vehicle (2) according to claim 1, characterized in that, The first cooler (301) is connected to a cab cooling unit (102) arranged in the cab (100), wherein the second cooler (302) and the third cooler (501) are connected to a battery cooling circuit (600), wherein the battery cooling circuit (600) includes at least one battery (601).

3. The cooling system (1) for a motor vehicle (2) according to claim 1 or 2, characterized in that, The second refrigerant circuit (505) has a fourth refrigerant (507) arranged in parallel with the third refrigerant (501).

4. The cooling system (1) for a motor vehicle (2) according to claim 2 or 3, characterized in that, A second switching valve (701) is arranged before the third refrigerator (501), and a third switching valve (702) is arranged after the third refrigerator (501).

5. The cooling system (1) for a motor vehicle (2) according to any one of the preceding claims, characterized in that, The first cooling medium outlet (408) of the first indirect condenser (303) and the second cooling medium outlet (409) of the second indirect condenser (502) are connected to a common heating circuit inlet line (407), wherein a shut-off valve (503) is arranged between the second cooling medium outlet (409) and the common heating circuit inlet line (407).

6. The cooling system (1) for a motor vehicle (2) according to claim 5, characterized in that, The cooling system (1) includes a first cooling medium cooler (201) and a second cooling medium cooler (202) and a cab heating circuit (108), wherein the first cooling medium cooler (201) and the cab heating circuit (108) can be connected to each other through a first switching valve (700).

7. The cooling system (1) for a motor vehicle (2) according to claim 6, characterized in that, The cab heating circuit (108) includes a first cab cooling medium pump (103) and a cab high-voltage heater (104), wherein a cab bypass valve (107) is provided, which can connect the cab heating circuit bypass (106).

8. The cooling system (1) for a motor vehicle (2) according to claim 6 or claim 7, characterized in that, The cooling system (1) includes an electronic device cooling circuit (400) that can be connected to the second cooling medium cooler (202) via a first electronic device circuit valve (405) and a second electronic device circuit valve (406), wherein an electronic device circuit cooler bypass (403) having an electronic device circuit bypass valve (404) is arranged before the second cooling medium cooler (202), wherein the electronic device cooling circuit (400) has at least one electronic device assembly (401) to be cooled.

9. The cooling system (1) for a motor vehicle (2) according to claim 8, characterized in that, The cooling system (1) includes a brake resistor cooling circuit (12), which has a brake resistor (10) and a brake resistor cooling medium pump (11), wherein the brake resistor cooling circuit (12) is connected to the second cooling medium cooler (202) or the third cooling medium cooler (204).

10. The cooling system (1) for a motor vehicle (2) according to claim 9, characterized in that, With the aid of the first electronic device circuit valve (405) and the second electronic device circuit valve (406), the second cooling medium cooler (202) can be connected to the first cooling medium cooler (201).

11. The cooling system (1) for a motor vehicle (2) according to claim 10, characterized in that, The fourth switching valve (703) is arranged in the cab heating circuit return (109) connected to the cab heating circuit (108) via the cab bypass valve (107), and the fourth switching valve (703) enables the cab heating circuit return (109) to be connected to the condenser inlet (506).

12. A motor vehicle (2) having a cooling system (1) according to any one of the preceding claims.

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