Cooling system and vehicle

Abstract

The invention provides a cooling system and a vehicle, and belongs to the technical field of cooling. The cooling system comprises a water pump, a motor, a first valve, a radiator, a second valve and an engine. The two ends of the first valve are communicated with the water outlet of the motor and the water inlet of the radiator, and the water outlet of the radiator is communicated with the water inlet of the water pump. When the first valve is opened, the motor communicates with the radiator, so that cooling liquid flows through the motor. Two ends of the second valve are connected with a water outlet of the motor and a water inlet of the engine, and a water outlet of the engine is communicated with a water inlet of the radiator. When the second valve is opened, the cooling liquid flows through the engine. By controlling opening or closing of the first valve and the second valve, cooling liquid can be controlled to flow only through the motor or the engine or flow through the motor and the engine at the same time. In this way, the motor and the engine can be cooled only through one cooling system, and therefore the size of the cooling system is small.

Description

Technical Field

[0001] The present disclosure relates to the field of cooling technology, and in particular to a cooling system and a vehicle. Background Art

[0002] The cooling system is an important component in hybrid vehicles, used to ensure that the engine and motor operate within the normal temperature range.

[0003] In the related art, a hybrid vehicle has two cooling systems, one for cooling the engine and the other for cooling the motor.

[0004] However, the two cooling systems in the related art are large in size and thus occupy a large space in the vehicle. Summary of the invention

[0005] The present disclosure provides a cooling system and a vehicle, which can solve the technical problems existing in the related technologies. The technical solutions of the cooling system and the vehicle are as follows.

[0006] In a first aspect, the present disclosure provides a cooling system for cooling a hybrid powertrain system;

[0007] The cooling system includes a water pump, a motor, a first valve, a radiator, a second valve and an engine;

[0008] The water outlet of the water pump is communicated with the water inlet of the motor, the two ends of the first valve are communicated with the water outlet of the motor and the water inlet of the radiator, the first valve is used to connect or disconnect the motor and the radiator, and the water outlet of the radiator is communicated with the water inlet of the water pump;

[0009] Both ends of the second valve are connected to the water outlet of the motor and the water inlet of the engine. The second valve is used to connect or disconnect the motor and the engine. The water outlet of the engine is connected to the water inlet of the radiator.

[0010] In a possible implementation, the hybrid system has a single-motor driving mode;

[0011] In the single motor driving mode, the motor is working, the engine is not working, the first valve is opened, and the second valve is closed. The coolant flows through the water pump, the motor, and the radiator in sequence. At this time, the coolant only cools the motor, so the flow path of the coolant is shorter, and the resistance is smaller, thereby reducing the energy consumption of the water pump.

[0012] In a possible implementation, the hybrid power system has an engine driving mode;

[0013] In the engine driving mode, the motor does not work, the engine works, the first valve is closed, and the second valve is opened. The coolant flows through the water pump, the motor, the engine, and the radiator in sequence, thereby cooling the engine.

[0014] In a possible implementation, the hybrid power system has a hybrid power driving mode;

[0015] In the hybrid driving mode, the motor and the engine are both working, the first valve is open, and the second valve is open. After the coolant enters the motor from the water pump, a portion of the coolant directly enters the radiator, and another portion of the coolant flows through the engine and then enters the radiator, thereby cooling the motor and the engine at the same time.

[0016] In a possible implementation, the hybrid power system has a charging mode;

[0017] In the charging mode, the engine drives the motor to rotate, the first valve is opened, and the second valve is opened. After the coolant enters the motor from the water pump, a portion of the coolant directly enters the radiator, and another portion of the coolant flows through the engine and then enters the radiator, thereby cooling the motor and the engine at the same time.

[0018] In a possible implementation, the cooling system further includes an oil cooler;

[0019] The two ends of the oil cooler are connected to the water outlet of the water pump and the water inlet of the motor. When the coolant flows through the oil cooler, heat exchange occurs with the oil, so that the temperature of the oil is reduced, thereby making the oil have a good lubrication effect.

[0020] In a possible implementation, the first valve is a one-way valve;

[0021] The second valve is a one-way valve.

[0022] In a possible implementation, the cooling system further includes a first temperature sensor, and the first temperature sensor is used to measure the temperature of the motor;

[0023] When the motor is working and the temperature of the motor is lower than a first temperature threshold, the opening of the first valve is a first opening;

[0024] When the temperature of the motor is greater than a first temperature threshold, the opening of the first valve is a second opening, wherein the second opening is greater than the first opening. In this way, the motor can be kept within a suitable temperature range.

[0025] In a possible implementation, the cooling system further includes a second temperature sensor, and the second temperature sensor is used to measure the temperature of the engine;

[0026] When the engine is working and the temperature of the engine is lower than the second temperature threshold, the opening of the second valve is a third opening;

[0027] When the temperature of the engine is greater than the second temperature threshold, the opening of the second valve is a fourth opening, wherein the fourth opening is greater than the third opening. In this way, the engine can be kept within a suitable temperature range.

[0028] In a possible implementation, the radiator is an air-cooled radiator. The radiator has a fan, and when the coolant flows through the radiator, the fan works to exchange heat between the air and the coolant, thereby reducing the temperature of the coolant.

[0029] In a possible implementation, the radiator is a water-cooled radiator.

[0030] In a possible implementation, the engine and the motor are connected via a planetary gear train.

[0031] In a second aspect, the present disclosure provides a vehicle, comprising a cooling system as described in any one of the first aspects.

[0032] The technical solution provided by the present disclosure includes at least the following beneficial effects:

[0033] The present disclosure provides a cooling system, in which the motor and the radiator are connected when the first valve is opened. The coolant can circulate between the motor and the radiator, thereby cooling the motor. When the second valve is opened, the engine and the radiator are connected. The coolant can circulate between the engine and the radiator, thereby cooling the engine. Therefore, by controlling the opening or closing of the first valve and the second valve, the coolant can be controlled to flow only through the motor, or only through the engine, or through the motor and the engine at the same time. In this way, the cooling of the motor and the engine can be achieved by only one cooling system in the hybrid power system. Therefore, the cooling system is small in size and occupies less space in the vehicle, which is convenient for the arrangement of other components in the vehicle.

[0034] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, are used to explain the principles of the present disclosure. In the drawings:

[0036] Figure 1 is a structural schematic diagram of a hybrid power system and a cooling system shown in an embodiment of the present disclosure;

[0037] Figure 2 is a structural schematic diagram of a cooling system shown in an embodiment of the present disclosure;

[0038] Figure 3 is a schematic diagram of the working principle of a cooling system shown in an embodiment of the present disclosure;

[0039] Figure 4 is a schematic diagram of the working principle of a cooling system shown in an embodiment of the present disclosure;

[0040] Figure 5 is a schematic diagram of the working principle of a cooling system shown in an embodiment of the present disclosure;

[0041] Figure 6 It is a schematic diagram of the working principle of a cooling system shown in an embodiment of the present disclosure.

[0042] Legend:

[0043] 1. Water pump;

[0044] 2. Motor;

[0045] 3. The first valve;

[0046] 4. Radiator;

[0047] 5. Second valve;

[0048] 6. Engine;

[0049] 7. Oil cooler;

[0050] 8. A first temperature sensor;

[0051] 9. A second temperature sensor;

[0052] 10. Shell;

[0053] 100. Cooling system.

[0054] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0056] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] The cooling system is an important component in hybrid vehicles, used to ensure that the engine and motor operate within the normal temperature range.

[0058] In the related art, a hybrid vehicle has two cooling systems, one for cooling the engine and the other for cooling the motor.

[0059] However, the two cooling systems in the related art are relatively large in size, and thus occupy a relatively large space in the vehicle, which is not conducive to the arrangement of other components in the vehicle.

[0060] In view of the above technical problems, the present disclosure provides a cooling system, such as Figure 1 and Figure 2 As shown, the cooling system 100 is used to cool the hybrid power system. The cooling system includes a water pump 1, a motor 2, a first valve 3, a radiator 4, a second valve 5 and an engine 6. The water outlet of the water pump 1 is connected to the water inlet of the motor 2, and the two ends of the first valve 3 are connected to the water outlet of the motor 2 and the water inlet of the radiator 4. The first valve 3 is used to connect or disconnect the motor 2 and the radiator 4, and the water outlet of the radiator 4 is connected to the water inlet of the water pump 1. The two ends of the second valve 5 are connected to the water outlet of the motor 2 and the water inlet of the engine 6. The second valve 5 is used to connect or disconnect the motor 2 and the engine 6, and the water outlet of the engine 6 is connected to the water inlet of the radiator 4.

[0061] The motor 2 and the engine 6 are provided with water jackets on their exteriors, and the water jackets have water inlets and water outlets. The various components are connected through pipelines, and the pipelines contain coolant.

[0062] A three-way valve is provided at the water outlet of the motor 2 , the water inlet of the three-way valve is connected to the water outlet of the motor 2 , and the two water outlets of the three-way valve are connected to the first valve 3 and the second valve 5 respectively.

[0063] A three-way valve is provided at the water inlet of the radiator 4 , and two water inlets of the three-way valve are respectively connected to the first valve 3 and the engine 6 , and a water outlet is connected to the water inlet of the radiator 4 .

[0064] The water pump 1, the motor 2, the first valve 3, the second valve 5 and the engine 6 share part of the housing, thereby reducing the weight and material cost of the cooling system.

[0065] In the technical solution provided by the embodiment of the present disclosure, the water pump 1, the motor 2, the first valve 3 and the radiator 4 are connected in sequence, and the motor 2 and the radiator 4 are connected when the first valve 3 is opened. The coolant can circulate between the motor 2 and the radiator 4, thereby cooling the motor 2. The water pump 1, the motor 2, the second valve 5, the engine 6 and the radiator 4 are connected in sequence, and the engine 6 and the radiator 4 are connected when the second valve 5 is opened. The coolant can circulate between the engine 6 and the radiator 4, thereby cooling the engine 6. By controlling the opening or closing of the first valve 3 and the second valve 5, the coolant can be controlled to flow only through the motor 2, or only through the engine 6, or through the motor 2 and the engine 6 at the same time. In this way, the cooling of the motor 2 and the engine 6 can be achieved through only one cooling system in the hybrid system, so the volume of the cooling system is small and the space occupied in the vehicle is small.

[0066] The hybrid power system has different driving modes. The working process of the cooling system in different driving modes is exemplarily described below.

[0067] In some examples, the hybrid powertrain has a single-motor drive mode.

[0068] In the single motor driving mode, the motor 2 works and the engine 6 does not work. The motor 2 will generate heat when it continues to work, but the engine 6 will not generate heat because it does not work. Therefore, in the single motor driving mode, it is only necessary to cool the motor 2.

[0069] like Figure 3As shown, at this time, the first valve 3 is open and the second valve 5 is closed. The coolant flows through the water pump 1, the motor 2 and the radiator 4 in sequence. When the coolant flows through the motor 2, it will take away the heat of the motor 2, so that the temperature of the motor 2 decreases, and the temperature of the coolant will increase at this time. When the coolant with increased temperature flows into the radiator 4, the radiator 4 will take away the heat of the coolant, so that the temperature of the coolant decreases. In this way, when the coolant passes through the water pump 1 and then flows through the motor 2, it can exchange heat with the motor 2 again, thereby forming a cooling cycle for the motor 2. Since the coolant only cools the motor 2, the flow path of the coolant is shorter, so the resistance is smaller, thereby reducing the energy consumption of the water pump 1.

[0070] In some examples, the hybrid powertrain has an engine drive mode.

[0071] In the engine drive mode, the motor 2 does not work, and the engine 6 works. The engine 6 will generate heat when it continues to work, but since the motor 2 does not work, the engine 6 will not generate heat, so in the engine drive mode, it is only necessary to cool the engine 6.

[0072] like Figure 4 As shown, at this time, the first valve 3 is closed and the second valve 5 is opened. The coolant flows through the water pump 1, the motor 2, the engine 6 and the radiator 4 in sequence. Although the coolant flows through the motor 2 at this time, since the motor 2 does not generate heat, the coolant will not exchange heat with the motor 2, so the coolant is still a coolant with a lower temperature when it enters the water inlet of the engine 6. When the coolant flows through the engine 6, it will drive the heat of the engine 6, so that the temperature of the engine 6 decreases, and the temperature of the coolant will increase at this time. When the coolant with increased temperature flows into the radiator 4, the radiator 4 will take away the heat of the coolant, so that the temperature of the coolant decreases. In this way, when the coolant flows through the engine 6 again through the water pump 1, it can exchange heat with the engine 6 again, thereby forming a cooling cycle for the engine 6.

[0073] In some examples, the hybrid powertrain has a hybrid drive mode.

[0074] In the hybrid driving mode, the motor 2 and the engine 6 are both working, and both the motor 2 and the engine 6 will generate heat, so it is necessary to dissipate heat from the motor 2 and the engine 6 at the same time.

[0075] like Figure 5As shown, at this time, the first valve 3 is open and the second valve 5 is open, so that two cooling circulation paths are formed in the cooling system. After the coolant enters the motor 2 from the water pump 1, a part of the coolant directly enters the radiator 4, and the other part of the coolant flows through the engine 6 and enters the radiator 4. Then the coolant is cooled in the radiator 4 and then enters the water pump 1, thereby forming a cooling cycle for the motor 2 and the engine 6. The motor 2 and the engine 6 can share a set of radiators 4 and water pumps 1 to achieve cooling at the same time, so the number of components in the cooling system is reduced, thereby reducing the volume of the cooling system. The volume occupied by the cooling system in the vehicle is small, which is conducive to the layout of other components in the vehicle.

[0076] In some examples, the hybrid powertrain has a charging mode.

[0077] In charging mode, the engine 6 drives the motor 2 to rotate, the first valve 3 is opened, and the second valve 5 is opened. At this time, the engine 6 rotates, and the motor 2 generates electricity under the drive of the engine 6, so both the motor 2 and the engine 6 generate heat. Therefore, it is necessary to dissipate heat from the motor 2 and the engine 6 at the same time.

[0078] like Figure 5 As shown, at this time, the first valve 3 is open and the second valve 5 is open, so that two cooling circulation paths are formed in the cooling system. After the coolant enters the motor 2 from the water pump 1, a part of the coolant directly enters the radiator 4, and the other part of the coolant flows through the engine 6 and enters the radiator 4. Then the coolant is cooled in the radiator 4 and then enters the water pump 1, thereby forming a cooling cycle for the motor 2 and the engine 6. The motor 2 and the engine 6 can achieve cooling at the same time by sharing a set of radiators 4 and water pumps 1, so that the number of components in the cooling system is reduced, thereby reducing the volume of the cooling system.

[0079] Among them, the charging mode includes driving charging mode and parking charging mode. In driving charging mode, part of the power of engine 6 is used to drive the wheels to rotate, and the other part of the power is used to drive motor 2 to generate electricity. In parking charging mode, all the power of engine 6 is used to drive motor 2 to generate electricity. Regardless of which charging mode is used, engine 6 and motor 2 will generate heat, so it is necessary to open the first valve 3 and the second valve 5 at the same time to cool down the engine 6 and motor 2 at the same time.

[0080] It is understandable that the hybrid power system may also have other modes. In different modes, the cooling system may open or close the first valve 3 and the second valve 5 according to the working conditions of the motor 2 and the engine 6, so as to cool the hybrid power system.

[0081] In some examples, such as Figure 6As shown, the cooling system further includes an oil cooler 7, and both ends of the oil cooler 7 are connected to the water outlet of the water pump 1 and the water inlet of the motor 2. The oil cooler 7 can be a water-cooled cooler, and the oil cooler has a coolant water inlet, a coolant water outlet, an oil inlet, and an oil outlet. When the coolant flows through the oil cooler 7, heat exchange occurs with the oil, so that the temperature of the oil is reduced, so that the oil has a good lubrication effect.

[0082] Illustratively, in the oil cooler 7, the flow direction of the coolant is opposite to that of the oil, so that the coolant and the oil can fully exchange heat, thereby improving the cooling effect on the oil, thereby ensuring that the oil has a good lubrication effect.

[0083] In some examples, the first valve 3 is a one-way valve, and the second valve 5 is a one-way valve. In this way, when the first valve 3 or the second valve 5 is opened, the coolant can flow in only one direction, thereby avoiding the cooling effect being affected by the backflow of the coolant.

[0084] In some examples, such as Figure 6 As shown, the cooling system further includes a first temperature sensor 8, which is used to measure the temperature of the motor 2. When the motor 2 is working, when the temperature of the motor 2 is less than the first temperature threshold, the opening of the first valve 3 is the first opening. When the temperature of the motor 2 is greater than the first temperature threshold, the opening of the first valve 3 is the second opening, wherein the second opening is greater than the first opening. In this way, the motor 2 can be kept within a suitable temperature range.

[0085] When the temperature of the motor 2 is low, the opening of the first valve 3 is small, so that less coolant flows through the motor 2, thereby preventing the motor 2 from being too cold. If the temperature of the motor 2 is too low, the viscosity of the lubricant in the motor will increase, resulting in an increase in the overall friction loss of the motor 2.

[0086] When the temperature of the motor 2 is high, the first valve 3 is opened more widely, so that more coolant flows through the motor 2, thereby achieving a good cooling effect on the motor 2. This prevents the motor 2 from being overheated, which may cause the motor to be easily damaged.

[0087] In some examples, such as Figure 6 As shown, the cooling system further includes a second temperature sensor 9, which is used to measure the temperature of the engine 6. When the engine 6 is working, when the temperature of the engine 6 is less than the second temperature threshold, the opening degree of the second valve 5 is the third opening degree. When the temperature of the engine 6 is greater than the second temperature threshold, the opening degree of the second valve 5 is the fourth opening degree, wherein the fourth opening degree is greater than the third opening degree. In this way, the engine 6 can be kept within a suitable temperature range.

[0088] When the temperature of the engine 6 is low, the opening of the second valve 5 is small, so that less coolant flows through the engine 6, thereby preventing the temperature of the engine 6 from being too low. If the temperature of the engine 6 is too low, it will cause difficulty in starting.

[0089] When the temperature of the engine 6 is high, the opening of the second valve 5 is large, so that more coolant flows through the engine 6, thereby achieving a good cooling effect on the engine 6, thereby avoiding the temperature of the engine 6 being too high, which would cause the power of the engine 6 to decrease.

[0090] In some examples, the radiator 4 may be an air-cooled radiator, in which a fan is provided. When the coolant flows through the radiator 4, the fan works to exchange heat between the air and the coolant, thereby reducing the temperature of the coolant.

[0091] In other examples, the radiator 4 may also be a water-cooled radiator, which is not specifically limited in the embodiments of the present disclosure. When the coolant flows through the radiator 4, the liquid in the radiator 4 can exchange heat with the coolant, thereby reducing the temperature of the coolant.

[0092] In some examples, the engine 6 and the motor 2 are connected via a planetary gear train. In the hybrid mode, the engine 6 can be decoupled from the wheels of the vehicle via the planetary gear train, so as to continue to work in the high-efficiency zone, thereby reducing the fuel consumption of the engine 6.

[0093] The embodiment of the present disclosure also provides a vehicle, which includes the above-mentioned cooling system.

[0094] The present disclosure does not specifically limit the type of vehicle, for example, a sedan, a bus, a truck, a sport utility vehicle (SUV), etc.

[0095] The technical solution provided by the embodiment of the present disclosure is that the water pump 1, the motor 2, the first valve 3, and the radiator 4 in the cooling system are connected in sequence, and the motor 2 and the radiator 4 are connected when the first valve 3 is opened. The coolant can circulate between the motor 2 and the radiator 4, thereby cooling the motor 2. The water pump 1, the motor 2, the second valve 5, the engine 6 and the radiator 4 are connected in sequence, and the engine 6 and the radiator 4 are connected when the second valve 5 is opened. The coolant can circulate between the engine 6 and the radiator 4, thereby cooling the engine 6. By controlling the opening or closing of the first valve 3 and the second valve 5, the coolant can be controlled to flow only through the motor 2, or only through the engine 6, or through the motor 2 and the engine 6 at the same time. In this way, the cooling of the motor 2 and the engine 6 can be achieved by only one cooling system in the hybrid system. Therefore, the cooling system is small in size, occupies less space in the vehicle, and is convenient for the arrangement of other components in the vehicle.

[0096] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A cooling system, characterized in that: The cooling system is used to cool the hybrid power system; The cooling system comprises a water pump (1), a motor (2), a first valve (3), a radiator (4), a second valve (5) and an engine (6); The water outlet of the water pump (1) is in communication with the water inlet of the motor (2); the two ends of the first valve (3) are in communication with the water outlet of the motor (2) and the water inlet of the radiator (4); the first valve (3) is used to connect or disconnect the motor (2) and the radiator (4); the water outlet of the radiator (4) is in communication with the water inlet of the water pump (1); The two ends of the second valve (5) are connected to the water outlet of the motor (2) and the water inlet of the engine (6); the second valve (5) is used to connect or disconnect the motor (2) and the engine (6); the water outlet of the engine (6) is connected to the water inlet of the radiator (4).

2. The cooling system according to claim 1, characterized in that: The hybrid system has a single-motor driving mode; In the single-motor driving mode, the motor (2) is working, the engine (6) is not working, the first valve (3) is open, and the second valve (5) is closed.

3. The cooling system according to claim 1, characterized in that: The hybrid system has an engine drive mode; In the engine drive mode, the motor (2) does not work, the engine (6) works, the first valve (3) is closed, and the second valve (5) is opened.

4. The cooling system according to claim 1, characterized in that: The hybrid system has a hybrid drive mode; In the hybrid driving mode, the motor (2) and the engine (6) are both working, the first valve (3) is open, and the second valve (5) is open.

5. The cooling system according to claim 1, characterized in that: The hybrid system has a charging mode; In the charging mode, the engine (6) drives the motor (2) to rotate, the first valve (3) is opened, and the second valve (5) is opened.

6. The cooling system according to any one of claims 1 to 5, characterized in that: The cooling system further comprises an oil cooler (7); Both ends of the oil cooler (7) are in communication with the water outlet of the water pump (1) and the water inlet of the motor (2).

7. The cooling system according to any one of claims 1 to 5, characterized in that: The first valve (3) is a one-way valve, and the second valve (5) is a one-way valve.

8. The cooling system according to any one of claims 1 to 5, characterized in that: The cooling system further comprises a first temperature sensor (8), wherein the first temperature sensor (8) is used to measure the temperature of the motor (2); When the motor (2) is working and the temperature of the motor (2) is lower than a first temperature threshold, the opening degree of the first valve (3) is a first opening degree; When the temperature of the motor (2) is greater than a first temperature threshold, the opening degree of the first valve (3) is a second opening degree, wherein the second opening degree is greater than the first opening degree.

9. The cooling system according to any one of claims 1 to 5, characterized in that: The cooling system further comprises a second temperature sensor (9), wherein the second temperature sensor (9) is used to measure the temperature of the engine (6); When the engine (6) is working and the temperature of the engine (6) is lower than a second temperature threshold, the opening degree of the second valve (5) is a third opening degree; When the temperature of the engine (6) is greater than a second temperature threshold, the opening degree of the second valve (5) is a fourth opening degree, wherein the fourth opening degree is greater than the third opening degree.

10. A vehicle, characterized in that: The vehicle comprises a cooling system according to any one of claims 1-9.

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