Retarder cooling structure, retarder cooling control method and engine cooling system

Abstract

The invention belongs to the technical field of engine cooling, and discloses a retarder cooling structure, a retarder cooling control method and an engine cooling system.The retarder cooling structure is used for being connected with a retarder, and the retarder is provided with a retarder cooling liquid inlet and a retarder cooling liquid outlet; the retarder cooling structure comprises a control valve, and the control valve is provided with a valve water inlet used for being connected with an engine cooling liquid outlet, a first water outlet used for being connected with a retarder cooling liquid inlet and a second water outlet used for being connected with a retarder cooling liquid outlet. The control valve has a first state and a second state, and when the control valve is in the second state, the cooling liquid can only flow out from the first water outlet, so that the retarder is cooled; when the control valve is in the first state, the cooling liquid can flow out from the first water outlet and the second water outlet, and part of the cooling liquid flows to the retarder to continuously cool the retarder; and the other part of the cooling liquid directly flows to a retarder cooling liquid outlet, so that the energy loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engine cooling, and in particular to a retarder cooling structure, a retarder cooling control method and an engine cooling system. Background Art

[0002] The hydraulic retarder is used to reduce the vehicle speed through a hydraulic device. The hydraulic retarder generates heat during operation, and the hydraulic retarder needs to be connected to the engine cooling system at the same time to take away the heat generated by the hydraulic retarder during braking, so as to cool the hydraulic retarder in a timely and effective manner. However, the problem with the above structure is that when the hydraulic retarder is not working, the engine coolant will still flow through the hydraulic retarder, which will cause the liquid resistance of the coolant pipeline to increase, affecting the coolant flow rate. Therefore, when selecting a water pump, it is necessary to select a water pump with a larger head and flow rate, which will increase energy consumption. Summary of the invention

[0003] According to one aspect of the present invention, a retarder cooling structure is provided to solve the problem in the prior art that when the hydraulic retarder is not working, the engine coolant still flows through the hydraulic retarder, resulting in increased liquid resistance of the coolant pipeline and increased energy consumption.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A retarder cooling structure is used to connect a retarder, the retarder having a retarder coolant inlet and a retarder coolant outlet; comprises a control valve, the control valve having a valve water inlet for connecting to an engine coolant outlet, a first water outlet for connecting to the retarder coolant inlet, and a second water outlet for connecting to the retarder coolant outlet; the control valve has a first state and a second state, when the control valve is in the first state, the coolant can flow out from the first water outlet and the second water outlet; when the control valve is in the second state, the coolant can only flow out from the first water outlet.

[0006] As a preferred solution of the retarder cooling structure, when the control valve is in the first state, the flow area of ​​the first water outlet is S1, and when the control valve is in the second state, the flow area of ​​the first water outlet is S2, S2>S1>0.

[0007] As a preferred solution of the retarder cooling structure, the control valve includes an outer shell and a valve core rotatably arranged in an inner cavity of the outer shell, the valve water inlet, the first water outlet and the second water outlet are all connected to the inner cavity, and the valve core can move relative to the outer shell to make the control valve in a first state or a second state. When the control valve is in the first state, the valve core blocks a part of the first water outlet, and when the control valve is in the second state, the valve core blocks the second water outlet.

[0008] As a preferred solution of the retarder cooling structure, the valve core includes a main body rotatably disposed on the outer shell and a baffle disposed on the main body, the main body can rotate relative to the outer shell to make the control valve be in a first state or a second state, when the control valve is in the first state, the baffle blocks a part of the first water outlet, and when the control valve is in the second state, the baffle blocks the second water outlet.

[0009] As a preferred solution of the retarder cooling structure, the control valve further comprises an electronic actuator disposed on the housing, and the electronic actuator is used to drive the valve core to rotate relative to the housing.

[0010] According to another aspect of the present invention, a retarder cooling control method is provided, which is implemented by the above-mentioned retarder cooling structure, and the retarder cooling control method comprises:

[0011] S100: Acquiring a displacement of a brake pedal;

[0012] S200: Determine the magnitude of the displacement of the brake pedal and a preset value;

[0013] If the displacement of the brake pedal is not less than the preset value, executing step S300;

[0014] If the displacement of the brake pedal is less than the preset value, executing step S400;

[0015] S300: the control valve enters a second state;

[0016] S400: The control valve enters a first state.

[0017] As a preferred solution of the retarder cooling control method, in step S400, the opening of the second water outlet is controlled based on the displacement of the brake pedal, and the greater the displacement of the brake pedal, the smaller the opening of the second water outlet.

[0018] As a preferred solution of the retarder cooling control method, in the retarder cooling structure, when the control valve is in the first state, the flow area of ​​the first water outlet is S1, and when the control valve is in the second state, the flow area of ​​the first water outlet is S2, S2>S1>0;

[0019] In step S400, the opening of the first water outlet is controlled based on the displacement of the brake pedal, and the greater the displacement of the brake pedal, the greater the opening of the first water outlet.

[0020] According to another aspect of the present invention, an engine cooling system is provided, comprising the above-mentioned retarder cooling structure, which is used to connect the retarder and the engine, the retarder having a retarder coolant inlet and a retarder coolant outlet, the engine having an engine coolant inlet and an engine coolant outlet, the engine coolant inlet being connected to a coolant source; the valve water inlet being connected to the engine coolant outlet; the first water outlet being connected to the retarder coolant inlet; and the second water outlet being connected to the retarder coolant outlet.

[0021] As a preferred solution of the engine cooling system, it further includes a water pump, wherein the engine coolant inlet is connected to the output end of the water pump, and the retarder coolant outlet is connected to the input end of the water pump.

[0022] As a preferred solution for the engine cooling system, the engine cooling system has a large circulation mode and a small circulation mode. When the engine cooling system is in the large circulation mode, the retarder coolant outlet is connected to the input end of the water pump through a first circulation pipeline, and the first circulation pipeline is provided with a vehicle cooling water tank; when the engine cooling system is in the small circulation mode, the retarder coolant outlet is connected to the input end of the water pump through a second circulation pipeline.

[0023] As a preferred solution of the engine cooling system, the retarder coolant outlet is connected to a thermostat, and the thermostat is used to connect the retarder coolant outlet to the first circulation pipeline or the second circulation pipeline.

[0024] The beneficial effects of the present invention are:

[0025] The present invention provides a retarder cooling structure, which is used to connect the retarder, and the retarder has a retarder coolant inlet and a retarder coolant outlet; the retarder cooling structure includes a control valve, and the control valve has a valve water inlet for connecting to the engine coolant outlet, a first water outlet for connecting to the retarder coolant inlet, and a second water outlet for connecting to the retarder coolant outlet; the control valve has a first state and a second state, when the control valve is in the first state, the coolant can flow out from the first water outlet and the second water outlet; when the control valve is in the second state, the coolant can only flow out from the first water outlet, and the second state of the control valve is suitable for the situation that the vehicle is braking, at which time the retarder participates in braking and generates Heat, and the coolant can only flow out from the first water outlet, so that the coolant can all flow to the retarder coolant inlet, and flow out through the retarder coolant outlet after cooling the retarder, thereby cooling the retarder; the first state is applicable to when the vehicle is not braking, and the retarder is not working at this time, but the temperature of the retarder may still be high, for example, when the retarder has just finished braking, and the coolant can flow out from the first water outlet and the second water outlet, so that part of the coolant flows to the retarder, and the retarder is continuously cooled to prevent the retarder from overheating; and the other part of the coolant does not pass through the retarder, but directly flows to the retarder coolant outlet, and the pipe resistance of this part of the coolant is small, thereby reducing energy loss.

[0026] The present invention also provides a retarder cooling control method, which is implemented through the above-mentioned retarder cooling structure. In the retarder cooling control method, the displacement of the brake pedal is obtained; the size of the displacement of the brake pedal and the preset value is judged, so as to judge the braking state of the vehicle at this time based on the displacement of the brake pedal, and control the state of the control valve. Specifically, if the displacement of the brake pedal is not less than the preset value, it indicates that the vehicle is in a braking state at this time. At this time, the control valve enters the second state, and the coolant can only flow out from the first water outlet, so as to cool the retarder; if the displacement of the brake pedal is less than the preset value, it indicates that the vehicle is not in a braking state at this time, or the braking torque is small, and there is no need to make all the coolant flow through the retarder and cool it, so the control valve enters the first state.

[0027] The present invention also provides an engine cooling system, including the above-mentioned retarder cooling structure, which is used to connect the retarder and the engine, the retarder has a retarder coolant inlet and a retarder coolant outlet, the engine has an engine coolant inlet and an engine coolant outlet, the engine coolant inlet is connected to a coolant source; the valve water inlet is connected to the engine coolant outlet; the first water outlet is connected to the retarder coolant inlet; the second water outlet is connected to the retarder coolant outlet, and the engine cooling system can cool down structures such as the engine. In addition, in the retarder cooling structure, when the control valve is in the second state, the coolant can only flow out from the first water outlet, thereby cooling the retarder; when the control valve is in the first state, the coolant can flow out from the first water outlet and the second water outlet, so that a part of the coolant flows to the retarder, continuously cools the retarder, and prevents the retarder from overheating; and another part of the coolant does not pass through the retarder, but directly flows to the retarder coolant outlet, and the pipeline resistance of this part of the coolant is small, thereby reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of an engine cooling system in an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of a control valve in an embodiment of the present invention;

[0030] Figure 3 4 is a flow chart of a retarder cooling control method in an embodiment of the present invention.

[0031] In the figure:

[0032] 100, control valve; 101, valve water inlet; 102, first water outlet; 103, second water outlet; 104, bypass pipeline; 110, housing; 111, inner cavity; 120, valve core; 121, body; 122, baffle; 130, electronic actuator;

[0033] 200, retarder; 201, retarder coolant inlet; 202, retarder coolant outlet;

[0034] 300, engine; 301, engine coolant inlet; 302, engine coolant outlet;

[0035] 400, water pump;

[0036] 510, first circulation pipeline; 511, vehicle cooling water tank; 520, second circulation pipeline;

[0037] 600. Thermostat. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] The hydraulic retarder is used to reduce the vehicle speed through a hydraulic device. The hydraulic retarder generates heat during operation, and the hydraulic retarder needs to be connected to the engine cooling system at the same time to take away the heat generated by the hydraulic retarder during braking, so as to cool the hydraulic retarder in a timely and effective manner. However, the problem with the above structure is that when the hydraulic retarder is not working, the engine coolant will still flow through the hydraulic retarder, which will cause the liquid resistance of the coolant pipeline to increase, affecting the coolant flow rate. Therefore, when selecting a water pump, it is necessary to select a water pump with a larger head and flow rate, which will increase energy consumption.

[0043] In this regard, this embodiment provides a retarder cooling structure to solve the problem in the prior art that when the hydraulic retarder is not working, the engine coolant still flows through the hydraulic retarder, causing the liquid resistance of the coolant pipeline to increase and the energy consumption to increase. It can be used in the field of engine cooling technology.

[0044] Reference Figure 1-Figure 2 The retarder cooling structure is used to connect the retarder 200. In this embodiment, the retarder 200 can be a hydraulic retarder or other types of retarder, which is not limited. The retarder 200 has a retarder coolant inlet 201 and a retarder coolant outlet 202. The retarder coolant inlet 201 is used for the entry of coolant. After the coolant enters through the retarder coolant inlet 201, it can exchange heat with the retarder 200 to reduce the heat of the retarder 200. Subsequently, the coolant flows out through the retarder coolant outlet 202.

[0045] Continue to refer to Figure 1-Figure 2 The retarder cooling structure includes a control valve 100, which has a valve water inlet 101 for connecting to the engine coolant outlet 302, a first water outlet 102 for connecting to the retarder coolant inlet 201, and a second water outlet 103 for connecting to the retarder coolant outlet 202. Specifically, the retarder 200 is provided with a bypass pipeline 104 in parallel, and both ends of the bypass pipeline 104 are respectively connected to the second water outlet 103 and the retarder coolant outlet 202, that is, the second water outlet 103 is connected to the retarder coolant outlet 202 through the bypass pipeline 104; the control valve 100 has a first state and a second state. When the control valve 100 is in the first state, the coolant can flow out from the first water outlet 102 and the second water outlet 103; when the control valve 100 is in the second state, the coolant can only flow out from the first water outlet 102. Among them, the second state of the control valve 100 is applicable to the situation that the vehicle is braking, at this time, the retarder 200 participates in braking and generates heat, and the coolant can only flow out from the first water outlet 102, so that the coolant can all flow to the retarder coolant inlet 201, and flow out through the retarder coolant outlet 202 after cooling the retarder 200, thereby cooling the retarder 200. The first state is applicable to when the vehicle is not braking, at this time the retarder 200 is not working, but the temperature of the retarder 200 may still be high, for example, when the retarder 200 has just finished braking, and the coolant can flow out from the first water outlet 102 and the second water outlet 103, so that part of the coolant flows to the retarder 200, and the retarder 200 is continuously cooled to prevent the retarder 200 from overheating; and the other part of the coolant does not pass through the retarder 200, but directly flows to the retarder coolant outlet 202, and the pipeline resistance of this part of the coolant is small, thereby reducing energy loss.

[0046] Continue to refer to Figure 1-Figure 2When the control valve 100 is in the first state, the flow area of ​​the first water outlet 102 is S1, and when the control valve 100 is in the second state, the flow area of ​​the first water outlet 102 is S2, S2>S1>0, so that when the control valve 100 is in the second state, the flow area of ​​the first water outlet 102 is greater than the flow area of ​​the first water outlet 102 when the control valve 100 is in the first state, that is, when the vehicle is in a braking state, the flow area of ​​the first water outlet 102 is larger, so as to increase the flow of the coolant as much as possible, and when the vehicle is not in a braking state, the flow area of ​​the first water outlet 102 is smaller, while ensuring that a part of the coolant can enter the retarder 200, the flow of the coolant flowing out through the second water outlet 103 is increased to further reduce the overall energy loss. Optionally, the flow area of ​​the valve inlet 101 remains unchanged, and the valve inlet 101 is never blocked, and its flow area is always kept at the maximum state.

[0047] Continue to refer to Figure 2 The control valve 100 includes a shell 110 and a valve core 120 rotatably disposed in an inner cavity 111 of the shell 110. The valve water inlet 101, the first water outlet 102 and the second water outlet 103 are all connected to the inner cavity 111. The valve core 120 can move relative to the shell 110 to make the control valve 100 in a first state or a second state. When the control valve 100 is in the first state, the valve core 120 blocks a part of the first water outlet 102. When the control valve 100 is in the second state, the valve core 120 blocks the second water outlet 103, so that the state of the control valve 100 can be changed by driving the valve core 120 to move.

[0048] In this embodiment, the valve core 120 includes a main body 121 rotatably disposed on the outer shell 110 and a baffle 122 disposed on the main body 121. The main body 121 can rotate relative to the outer shell 110 to place the control valve 100 in a first state or a second state. When the control valve 100 is in the first state, the baffle 122 blocks a portion of the first water outlet 102. When the control valve 100 is in the second state, the baffle 122 blocks the second water outlet 103. Thus, by controlling the rotation of the main body 121 relative to the outer shell 110, the baffle 122 is driven to move, so that the baffle 122 blocks the first water outlet 102 or the second water outlet 103 as needed to change the state of the control valve 100.

[0049] In other embodiments, the valve core 120 can also be slidably disposed on the housing 110 so that the valve core 120 can block a portion of the first water outlet 102 or the second water outlet 103 , thereby controlling the state of the control valve 100 through the sliding of the valve core 120 .

[0050] Continue to refer to Figure 2The control valve 100 further includes an electronic actuator 130 disposed on the housing 110. The electronic actuator 130 is used to drive the valve core 120 to rotate relative to the housing 110, thereby realizing the electrical control of the valve core 120. In this embodiment, the electronic actuator 130 is a motor. In addition, the electronic actuator 130 is connected to the controller, and the controller can send an execution signal to the electronic actuator 130, so that the electronic actuator 130 drives the valve core 120 to move, so as to change the state of the control valve 100.

[0051] This embodiment also provides a retarder cooling control method, which is implemented by the retarder cooling structure. Figure 3 , the retarder cooling control method includes the following steps.

[0052] S100: Obtain the displacement of the brake pedal.

[0053] The displacement of the brake pedal can be obtained through a displacement sensor.

[0054] S200: Determine the difference between the displacement of the brake pedal and a preset value.

[0055] If the displacement of the brake pedal is not less than the preset value, step S300 is executed; if the displacement of the brake pedal is less than the preset value, step S400 is executed.

[0056] The preset value may be set according to actual needs. Generally speaking, when the displacement of the brake pressure plate reaches the preset value, the retarder 200 should start to work.

[0057] S300: The control valve 100 enters the second state.

[0058] S400: The control valve 100 enters the first state.

[0059] Through the above steps, the braking state of the vehicle at this time can be judged based on the displacement of the brake pedal, and the state of the control valve 100 can be controlled. Specifically, if the displacement of the brake pedal is not less than the preset value, it indicates that the vehicle is in a braking state at this time. At this time, step S300 is executed, and the control valve 100 enters the second state. The coolant can only flow out from the first water outlet 102, thereby cooling the retarder 200; if the displacement of the brake pedal is less than the preset value, it indicates that the vehicle is not in a braking state at this time, or the braking torque is small, and there is no need to make all the coolant flow through the retarder 200 and cool it, so step S400 is executed, and the control valve 100 enters the first state.

[0060] Optionally, in step S400, the opening of the second water outlet 103 is controlled based on the displacement of the brake pedal, and the larger the displacement of the brake pedal, the smaller the opening of the second water outlet 103. Specifically, when the displacement of the brake pedal is 0, the opening of the second water outlet 103 is the largest; as the displacement of the brake pedal increases, the opening of the second water outlet 103 gradually decreases; when the displacement of the brake pedal increases to a preset value, the second water outlet 103 is completely closed. In this way, the opening of the second water outlet 103 can be changed according to the actual displacement of the brake pedal to control the flow of the coolant entering the bypass pipeline 104. The first mapping relationship between the displacement of the brake pedal and the target opening of the second water outlet 103 can be pre-set in the controller, and the target opening of the second water outlet 103 is obtained based on the obtained displacement of the brake pedal and the first mapping relationship, and the valve core 120 is driven to rotate through the electronic actuator 130 according to the target opening of the second water outlet 103 to adjust the opening of the second water outlet 103. The first mapping relationship can be obtained through a large number of experiments in the early stage and stored in the controller in advance.

[0061] Optionally, in step S400, the opening of the first water outlet 102 is controlled based on the displacement of the brake pedal, and the greater the displacement of the brake pedal, the greater the opening of the first water outlet 102. Specifically, when the displacement of the brake pedal is 0, the opening of the first water outlet 102 is the smallest, but its opening is still greater than 0; as the displacement of the brake pedal increases, the opening of the first water outlet 102 gradually increases; when the displacement of the brake pedal increases to a preset value, the first water outlet 102 is fully opened and the opening is the largest. In this way, the opening of the first water outlet 102 can be changed according to the actual displacement of the brake pedal to control the flow of the coolant entering the retarder coolant inlet 201. The second mapping relationship between the displacement of the brake pedal and the target opening of the first water outlet 102 can be pre-set in the controller, and the target opening of the first water outlet 102 is obtained based on the displacement of the brake pedal and the second mapping relationship, and the valve core 120 is driven to rotate through the electronic actuator 130 according to the target opening of the first water outlet 102 to adjust the opening of the first water outlet 102. The second mapping relationship can be obtained through a large number of experiments in the early stage and stored in the controller in advance.

[0062] Continue to refer to Figure 1The present embodiment also provides an engine cooling system, including the above-mentioned retarder cooling structure, which is used to connect the retarder 200 and the engine 300, the retarder 200 has a retarder coolant inlet 201 and a retarder coolant outlet 202, the engine 300 has an engine coolant inlet 301 and an engine coolant outlet 302, the engine coolant inlet 301 is connected to a coolant source; the valve water inlet 101 is connected to the engine coolant outlet 302; the first water outlet 102 is connected to the retarder coolant inlet 201; the second water outlet 103 is connected to the retarder coolant outlet 202, and the engine cooling system can cool the engine 300 In addition, in the retarder cooling structure, when the control valve 100 is in the second state, the coolant can only flow out from the first water outlet 102, thereby cooling the retarder 200; when the control valve 100 is in the first state, the coolant can flow out from the first water outlet 102 and the second water outlet 103, so that a part of the coolant flows to the retarder 200, and the retarder 200 is continuously cooled to prevent the retarder 200 from overheating; and the other part of the coolant does not pass through the retarder 200, but directly flows to the retarder coolant outlet 202, and the pipeline resistance of this part of the coolant is small, thereby reducing energy loss.

[0063] Continue to refer to Figure 1 The coolant in this embodiment is specifically water, and the engine cooling system also includes a water pump 400, the engine coolant inlet 301 is connected to the output end of the water pump 400, and the retarder coolant outlet 202 is connected to the input end of the water pump 400, so that the coolant is driven to flow through the water pump 400, so that the coolant flows through the engine 300, the control valve 100 and the retarder 200 in sequence, so that heat exchange occurs between the engine 300 and the retarder 200 and the coolant, so as to achieve cooling of the engine 300 and the retarder 200.

[0064] Continue to refer to Figure 1 The engine cooling system has a large circulation mode and a small circulation mode. When the engine cooling system is in the large circulation mode, the retarder coolant outlet 202 is connected to the input end of the water pump 400 through the first circulation pipeline 510, and the first circulation pipeline 510 is provided with a vehicle cooling water tank 511. At this time, the cooling efficiency of the engine cooling system is relatively large. When the engine cooling system is in the small circulation mode, the retarder coolant outlet 202 is connected to the input end of the water pump 400 through the second circulation pipeline 520, and the cooling efficiency of the engine cooling system is relatively small.

[0065] Continue to refer to Figure 1The retarder coolant outlet 202 is connected to a thermostat 600, which is used to connect the retarder coolant outlet 202 to the first circulation pipeline 510 or the second circulation pipeline 520. The thermostat 600 can automatically adjust the amount of water entering the two circulation pipelines according to the temperature of the cooling water, change the circulation path of the water, and adjust the mode of the engine cooling system. In this embodiment, the thermostat 600 is a wax thermostat, while in other embodiments, the thermostat 600 can also use other types of thermostats and have the same technical effect.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A retarder cooling structure, used for connecting a retarder (200), wherein the retarder (200) has a retarder coolant inlet (201) and a retarder coolant outlet (202); characterized in that: The invention comprises a control valve (100), wherein the control valve (100) has a valve water inlet (101) for connecting to an engine coolant outlet (302), a first water outlet (102) for connecting to a retarder coolant inlet (201), and a second water outlet (103) for connecting to the retarder coolant outlet (202); the control valve (100) has a first state and a second state; when the control valve (100) is in the first state, the coolant can flow out from the first water outlet (102) and the second water outlet (103); when the control valve (100) is in the second state, the coolant can only flow out from the first water outlet (102).

2. The retarder cooling structure according to claim 1, characterized in that: When the control valve (100) is in a first state, the flow area of ​​the first water outlet (102) is S1, and when the control valve (100) is in a second state, the flow area of ​​the first water outlet (102) is S2, and S2>S1>0.

3. The retarder cooling structure according to claim 1, characterized in that: The control valve (100) comprises a housing (110) and a valve core (120) rotatably arranged in an inner cavity (111) of the housing (110); the valve water inlet (101), the first water outlet (102) and the second water outlet (103) are all connected to the inner cavity (111); the valve core (120) can move relative to the housing (110) so that the control valve (100) is in a first state or a second state; when the control valve (100) is in the first state, the valve core (120) blocks a part of the first water outlet (102); when the control valve (100) is in the second state, the valve core (120) blocks the second water outlet (103).

4. The retarder cooling structure according to claim 3, characterized in that: The valve core (120) comprises a main body (121) rotatably disposed on the housing (110) and a baffle (122) disposed on the main body (121); the main body (121) is rotatable relative to the housing (110) so that the control valve (100) is in a first state or a second state; when the control valve (100) is in the first state, the baffle (122) blocks a portion of the first water outlet (102); when the control valve (100) is in the second state, the baffle (122) blocks the second water outlet (103).

5. The retarder cooling structure according to claim 3, characterized in that: The control valve (100) further comprises an electronic actuator (130) arranged on the housing (110), and the electronic actuator (130) is used to drive the valve core (120) to rotate relative to the housing (110).

6. A retarder cooling control method, characterized in that: By implementing the retarder cooling structure according to any one of claims 1 to 5, the retarder cooling control method comprises: S100: Acquiring a displacement of a brake pedal; S200: Determine the magnitude of the displacement of the brake pedal and a preset value; If the displacement of the brake pedal is not less than the preset value, executing step S300; If the displacement of the brake pedal is less than the preset value, executing step S400; S300: the control valve (100) enters the second state; S400: The control valve (100) enters a first state.

7. The retarder cooling control method according to claim 6, characterized in that: In step S400, the opening of the second water outlet (103) is controlled based on the displacement of the brake pedal, and the greater the displacement of the brake pedal, the smaller the opening of the second water outlet (103).

8. The retarder cooling control method according to claim 6, characterized in that: In the retarder cooling structure, when the control valve (100) is in a first state, the flow area of ​​the first water outlet (102) is S1, and when the control valve (100) is in a second state, the flow area of ​​the first water outlet (102) is S2, and S2>S1>0; In step S400, the opening of the first water outlet (102) is controlled based on the displacement of the brake pedal, and the greater the displacement of the brake pedal, the greater the opening of the first water outlet (102).

9. The engine cooling system is characterized in that: The invention comprises a retarder cooling structure as claimed in any one of claims 1 to 5, and is used for connecting a retarder (200) and an engine (300), wherein the retarder (200) has a retarder coolant inlet (201) and a retarder coolant outlet (202), and the engine (300) has an engine coolant inlet (301) and an engine coolant outlet (302), wherein the engine coolant inlet (301) is connected to a coolant source; the valve water inlet (101) is connected to the engine coolant outlet (302); the first water outlet (102) is connected to the retarder coolant inlet (201); and the second water outlet (103) is connected to the retarder coolant outlet (202).

10. The engine cooling system according to claim 9, characterized in that: It also includes a water pump (400), the engine coolant inlet (301) is connected to the output end of the water pump (400), and the retarder coolant outlet (202) is connected to the input end of the water pump (400).

11. The engine cooling system according to claim 10, characterized in that: The engine cooling system has a large circulation mode and a small circulation mode. When the engine cooling system is in the large circulation mode, the retarder coolant outlet (202) is connected to the input end of the water pump (400) via a first circulation pipeline (510), and the first circulation pipeline (510) is provided with a vehicle cooling water tank (511); when the engine cooling system is in the small circulation mode, the retarder coolant outlet (202) is connected to the input end of the water pump (400) via a second circulation pipeline (520).

12. The engine cooling system according to claim 11, characterized in that: The retarder coolant outlet (202) is connected to a thermostat (600), and the thermostat (600) is used to connect the retarder coolant outlet (202) to the first circulation pipeline (510) or to the second circulation pipeline (520).

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