A hydraulic retarder heat dissipation system and heat dissipation method with warm-up function

Abstract

The present invention provides a hydraulic retarder heat dissipation system and heat dissipation method with a warm-up function. The heat dissipation system includes a controller, a radiator, an engine, a transmission, a retarder, a retarder heat exchanger, an electronic fan, an intercooler, a thermostat, a drive pump, an engine water outlet temperature sensor, a check valve, a first three-way valve, and a second three-way valve. The retarder and the engine share a cooling system, and the cooling medium used by the engine and the working medium of the retarder are the same circulating medium. When the engine is cold-started, when the retarder operates for a short time on a small slope, and when the retarder operates for a long time on a large slope, the circulation loops of the circulating medium are different through the coordinated operation of valves and electrical signals, so that the working purpose of the retarder and even the braking intensity are matched with the heat dissipation capacity, thereby achieving the effect of both warm-up function and efficient heat dissipation during braking.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile cooling systems, and in particular to a hydraulic retarder heat dissipation system and a heat dissipation method with a warm-up function. Background Art

[0002] The braking system is crucial for safe driving. Based on their function, it is divided into service brakes, parking brakes, and auxiliary brakes. The first two brakes can slow down, stop, or hold a stopped vehicle in place, while auxiliary brakes are typically used to maintain a constant speed when descending a long slope.

[0003] Heavy-duty vehicles relying solely on drum brakes are far from achieving the braking performance required for safe operation. This is especially true when driving on long, continuous downhill slopes, rough, or even harsh roads. Relying solely on drum brakes increases the risk of accidents due to the thermal degradation of the brake pads. Braking systems equipped with water sprayers can also lead to thermal fatigue of the brake pads due to alternating hot and cold conditions. In cold winter regions, the water sprayers can cause roads to ice up, potentially causing accidents.

[0004] As a vehicle auxiliary braking device, hydraulic retarders are widely used in vehicles that are required by regulations to be equipped with auxiliary braking devices because of their low brake component wear, long service life, high braking torque, smooth braking process without thermal decay, and good heat dissipation performance.

[0005] The braking effect of the retarder is greatly affected by the working medium and the performance of the retarder's cooling system. The braking torque of the hydraulic retarder comes from the interaction between the working medium and the stator and rotor of the retarder, which converts the kinetic energy of the working medium into thermal energy. This will cause the working medium temperature to rise, resulting in a decrease in its viscosity; the decrease in viscosity will in turn affect the braking performance of the hydraulic retarder. It can be seen from this that in order to ensure good braking performance of the retarder, the heat absorbed by the working medium needs to be dissipated in a timely manner to ensure its viscosity, which means that a cooling system with excellent heat dissipation performance is needed to ensure the braking performance of the retarder. Summary of the Invention

[0006] The present invention aims to solve the problem that the kinetic energy of the hydraulic retarder is converted into heat energy that cannot be dissipated in time during operation, resulting in poor braking effect of the hydraulic retarder. A hydraulic retarder heat dissipation system and heat dissipation method with warm-up function are provided to achieve excellent braking effect of the hydraulic retarder and technically support rapid cold start of the engine.

[0007] The retarder described in this invention shares a cooling system with the vehicle engine, with the engine's cooling medium and the retarder's operating medium being the same circulating medium. During cold engine startup, short-term retarder operation on small slopes, and long-term retarder operation on large slopes, valves and electrical signals coordinate to create different circulating medium loops. This allows the retarder's operating purpose and even braking intensity to be matched to its heat dissipation capacity, achieving both engine warm-up and efficient heat dissipation during braking.

[0008] The technical solutions of the present invention are as follows:

[0009] A hydraulic retarder heat dissipation system with a warm-up function, the heat dissipation system comprising a controller, a radiator 1, an engine 2, a transmission 3, a retarder 4, a retarder heat exchanger 5, an electronic fan 6, an intercooler 8, a thermostat 9, a drive pump 11, an engine outlet water temperature sensor 12, a check valve 13, a first three-way valve 10, and a second three-way valve 14;

[0010] Among them, the water inlet and water outlet of the radiator 1 are both connected to the water inlet of the engine 2 through a cooling pipe, the engine 2 is connected to the transmission 3, the transmission 3 is connected to the retarder 4, the water inlet of the engine 2 and the water inlet of the radiator 1 are both connected to the water inlet of the retarder heat exchanger 5 through a cooling pipe, the water outlet of the retarder heat exchanger 5 is connected to the water inlet of the intercooler 8 through a cooling pipe, the water outlet of the intercooler 8 is connected to the inlet of the retarder 4 through a cooling pipe, the water outlet of the intercooler 8 is also connected to the water inlet of the engine 2 and the water inlet of the radiator 1 through a cooling pipe, the inlet of the retarder 4 is also connected to the water outlet of the engine 2 and the water inlet of the engine 2 through cooling pipes, and the outlet of the retarder 4 is connected to the water inlet of the retarder heat exchanger 5 through a cooling pipe.

[0011] Preferably, the thermostat 9 is installed on the cooling pipeline between the water inlet end of the radiator 1 , the water inlet end of the engine 2 and the water inlet end of the retarder heat exchanger 5 .

[0012] Preferably, the driving pump 11 is installed at the water inlet end of the engine 2 , and the engine water outlet temperature sensor 12 is installed at the water outlet end of the engine 2 .

[0013] Preferably, the check valve 13 is installed on the cooling pipeline between the water outlet of the intercooler 8 and the inlet of the retarder 4, the second three-way valve 14 is respectively connected to the water inlet of the engine 2, the water inlet of the retarder heat exchanger 5 and the outlet of the retarder 4, and the first three-way valve 10 is respectively connected to the water outlet of the engine 2, the water inlet of the engine 2 and the inlet of the retarder 4.

[0014] Preferably, the heat dissipation method includes the following working conditions:

[0015] 1) Under the cold start condition of the engine 2, the thermostat 9 and the engine outlet water temperature sensor 12 monitor the temperature of the circulating medium in the cooling system and feed back to the controller. The controller causes the circulating medium to circulate between the engine 2 and the retarder 4 through the cooling pipe during the cold start condition of the engine 2. The heat generated by the retarder 4 warms up the engine 2 until the engine 2 starts normally.

[0016] 2) After engine 2 is started normally and the vehicle is driving normally, the temperature of the circulating medium in the cooling system rises to a preset value m. This preset value m is monitored by the engine water outlet temperature sensor 12 and the thermostat 9 and fed back to the controller. The controller causes the circulating medium to circulate through the engine bypass water channel formed between the radiator 1 and the engine 2 through the cooling pipe to ensure that the engine 2 operates within the appropriate temperature range.

[0017] Preferably, the heat dissipation method further includes:

[0018] 3) Under the hydraulic retarding braking condition of a small slope and short time, the controller causes the circulating medium to circulate between the engine 2, the retarder heat exchanger 5, the intercooler 8 and the retarder 4, thereby maintaining the braking performance of the retarder 4;

[0019] During this working process, part of the cooled circulating medium is led back to the inlet of the retarder 4 through the check valve 13, and part of the circulating medium that is cooled by the intercooler 8 and then led back is combined with the circulating medium cooled by the engine 2 at the inlet of the retarder 4, and then exchanges heat with the heat generated by the operation of the retarder 4, thereby maintaining the braking performance of the retarder 4.

[0020] Preferably, the heat dissipation method further includes:

[0021] 4) Under long-term hydraulic retarding braking conditions on a steep slope, the controller causes the circulating medium to circulate not only between the engine 2, the retarder heat exchanger 5, the intercooler 8, and the retarder 4, but also through the engine bypass water channel formed between the radiator 1 and the engine 2, forming a large loop for efficient cooling.

[0022] Preferably, the controller controls the electronic fan 6 to start up to enhance air convection cooling; the driving pump 11 in the circulation loop promotes the flow of the circulating medium.

[0023] Preferably, the check valve 13 allows circulation to flow in only one direction, thereby flowing according to a predetermined circulation loop; the second three-way valve 14 with a sensor and the first three-way valve 10 receive instructions from the controller to control the on and off of the circulation loop.

[0024] The hydraulic retarder heat dissipation system and heat dissipation method of the present invention, which also has a warm-up function, have the following advantages and positive effects compared with the prior art:

[0025] 1) The retarder described in this invention shares a cooling system with the vehicle engine, with the engine's cooling medium and the retarder's operating medium being the same circulating medium. During cold engine startup, short-term retarder operation on gentle slopes, and long-term retarder operation on steep slopes, valves and electrical signals coordinate to differentiate the circulating medium's circuits. This allows the retarder's operating purpose, and even braking intensity, to be matched to its heat dissipation capacity, achieving both engine warm-up and efficient heat dissipation during braking.

[0026] 2) The present invention provides a hydraulic retarder heat dissipation system and heat dissipation method with a warm-up function, which can adjust and match the required heat dissipation capacity of the retarder under different working conditions, and can even assist in rapid starting when the engine is cold.

[0027] 3) The synergistic effect enables the retarder to have a highly efficient heat dissipation effect. Through the engine outlet water temperature sensor 12, the thermostat 9 monitoring and the signal sending and receiving mechanism of the second three-way valve 14, the first three-way valve 10 and the check valve 13, the circulation loop of the circulating medium is different under different operating conditions, thereby achieving the goal of taking into account the rapid start of the engine in the cold start state and even the adjustment of the heat dissipation capacity under different braking torques.

[0028] 4) The circulating medium in each circulation loop is promoted to flow in the circulation loop by driving the pump 11. The function of the check valve 13 at each cooling loop is to prevent the circulating medium from flowing in one direction along the preset circulation loop under specific working conditions, thereby achieving the multifunctional and efficient heat dissipation effect.

[0029] 5) When starting engine 2 from cold, the heat generated by retarder 4 is primarily used to warm up engine 2. When the rapid warm-up switch is activated, the transmission structure is controlled to interrupt power to the rear axle; transmission 3 is controlled to shift into a predetermined gear, increasing the speed of engine 2 to a preset operating speed range; and the heat generated by retarder 4 is used to preheat the circulating medium.

[0030] 6) When the engine is warmed up, the retarder 4 is not in operation. During a cold start, the retarder 4 generates heat to preheat the circulating medium to a certain threshold. After the engine 2 is started, the circulating medium loop is changed and the retarder 4 is disengaged.

[0031] 7) System cooling loop when retarder 4 operates for a short period of time and has a low filling rate. The circulating medium, after exchanging heat in retarder 4, flows into heat exchanger 5 and then into intercooler 8 for partial cooling. After exiting intercooler 8, part of the circulating medium is directed back to the inlet of retarder 4.

[0032] 8) When retarder 4 operates for extended periods and has a relatively high fluid filling rate, engine 2 bypass water circulation and auxiliary convection from electronic fan 6 are added to the small-circuit cooling system. Electronic fan 6 only activates when needed, thus meeting efficient cooling and heat dissipation requirements while saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. By referring to the drawings, the features and advantages of the present invention will be more clearly understood. The drawings are schematic and should not be understood as limiting the present invention in any way. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 This is the flow circuit diagram of the circulating medium when the engine is started in cold state.

[0035] Figure 2 This is a circulation circuit diagram of the circulating medium after the engine is warmed up and started to run normally.

[0036] Figure 3 This is a circulation loop diagram of the circulating medium when the hydraulic retarder works for a short time and the filling rate is low.

[0037] Figure 4 This is a circulation loop diagram of the circulating medium when the hydraulic retarder works for a long time and the filling rate is relatively high.

[0038] The reference numerals are as follows: 1. Radiator 2. Engine 3. Transmission 4. Retarder 5. Retarder heat exchanger 6. Electronic fan 7. Engine water circulation system 8. Intercooler 9. Thermostat 10. First three-way valve 11. Drive pump 12. Engine outlet water temperature sensor 13. Check valve 14. Second three-way valve. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0040] Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0041] The present invention provides a high-efficiency hydraulic retarder heat dissipation system with an engine warm-up function, thereby achieving excellent braking effect of the hydraulic retarder and technically supporting rapid cold-state engine starting.

[0042] As attached Figure 1-4 As shown, a high-efficiency hydraulic retarder cooling system with engine warm-up function includes a controller, a radiator 1, an engine 2, a transmission 3, a retarder 4, a retarder heat exchanger 5, an electronic fan 6, an intercooler 8, a thermostat 9, a drive pump 11, an engine water outlet temperature sensor 12, a check valve 13, a first three-way valve 10 and a second three-way valve 14.

[0043] Among them, the water inlet and water outlet of the radiator 1 are both connected to the water inlet of the engine 2 through a cooling pipe, the engine 2 is connected to the transmission 3, the transmission 3 is connected to the retarder 4, the water inlet of the engine 2 and the water inlet of the radiator 1 are both connected to the water inlet of the retarder heat exchanger 5 through a cooling pipe, the water outlet of the retarder heat exchanger 5 is connected to the water inlet of the intercooler 8 through a cooling pipe, the water outlet of the intercooler 8 is connected to the inlet of the retarder 4 through a cooling pipe, the water outlet of the intercooler 8 is also connected to the water inlet of the engine 2 and the water inlet of the radiator 1 through a cooling pipe, the inlet of the retarder 4 is also connected to the water outlet of the engine 2 and the water inlet of the engine 2 through cooling pipes, and the outlet of the retarder 4 is connected to the water inlet of the retarder heat exchanger 5 through a cooling pipe.

[0044] The thermostat 9 is installed on the cooling pipeline between the water inlet end of the radiator 1, the water inlet end of the engine 2 and the water inlet end of the retarder heat exchanger 5, the drive pump 11 is installed on the water inlet end of the engine 2, the engine outlet water temperature sensor 12 is installed on the water outlet end of the engine 2, the check valve 13 is installed on the cooling pipeline between the water outlet end of the intercooler 8 and the inlet of the retarder 4, the second three-way valve 14 is respectively connected to the water inlet end of the engine 2, the water inlet end of the retarder heat exchanger 5 and the outlet of the retarder 4, and the first three-way valve 10 is respectively connected to the water outlet end of the engine 2, the water inlet end of the engine 2 and the inlet of the retarder 4.

[0045] The synergistic effect enables the retarder to have a highly efficient heat dissipation effect. Through the engine water outlet temperature sensor 12, the thermostat 9 monitoring and the signal sending and receiving mechanism of the second three-way valve 14, the first three-way valve 10 and the check valve 13, the circulation loop of the circulating medium is different under different working conditions, thereby achieving the adjustment of the heat dissipation capacity under different braking torques while taking into account the rapid start of the engine in the cold start state.

[0046] The circulating medium in each circulation loop is promoted to flow in the circulation loop by driving the pump 11. The function of the check valve 13 at each cooling loop is to make the circulating medium flow in only one direction along the preset circulation loop under specific working conditions, so as to achieve the multifunctional and efficient heat dissipation effect.

[0047] When the retarder 4 is in operation, the circulating medium circulates between the engine 2, the retarder heat exchanger 5, the intercooler 8, and the retarder 4. Using the feedback principle, a portion of the circulating medium cooled by the intercooler 8 is directed back to the retarder 4, thereby improving the heat exchange performance within the retarder 4, making the viscosity of the working medium of the retarder 4 suitable for operation, and improving the braking performance of the retarder 4.

[0048] The retarder 4 described in the present invention shares a cooling system with the vehicle's engine 2, and the engine's cooling medium and the retarder 4's operating medium are the same circulating medium. During cold engine startup, short-term retarder 4 operation on small slopes, and long-term retarder 4 operation on large slopes, valves and electrical signals coordinate to differentiate the circulating medium's circuits. This allows the retarder 4's operating purpose, and even braking intensity, to be matched to its heat dissipation capacity, achieving both warm-up and efficient heat dissipation during braking.

[0049] like Figure 1 As shown, when the engine 2 is cold-started, the heat generated by the retarder 4 is primarily used to warm up the engine 2. When the rapid warm-up switch is activated, the transmission structure is controlled to interrupt power to the rear axle; the transmission 3 is controlled to perform a predetermined gear shift, increasing the engine 2 speed to a preset operating speed range; and the heat generated by the retarder 4 is used to preheat the circulating medium.

[0050] Figure 2 When the warm-up is completed, the retarder 4 does not participate in the work. When the cold start utilizes the retarder 4 to generate heat to preheat the circulating medium to a certain threshold, after the engine 2 is started, the circulating medium circulation loop changes and the retarder 4 is out of work.

[0051] Figure 3 This is the system cooling loop when the retarder 4 operates for a short period of time and the filling rate is low. After exchanging heat in the retarder 4, the circulating medium flows into the heat exchanger 5 and then into the intercooler 8 for partial cooling. After exiting the intercooler 8, part of the circulating medium is directed back to the inlet of the retarder 4.

[0052] Figure 4 When the retarder 4 is working for a long time and the filling rate is relatively high, the engine 2 bypass water circulation and the auxiliary convection of the electronic fan 6 are added to the small-circulation cooling. The electronic fan 6 will only work when it is needed to intervene, thereby meeting the requirements of efficient cooling and heat dissipation while saving energy.

[0053] The working process of the heat dissipation system of the present invention, that is, the heat dissipation methods under different working conditions are as follows:

[0054] As attached Figure 1 As shown, during a cold start of the vehicle, the engine 2 is relatively low in temperature, making it difficult to start the engine 2. Therefore, the heat generated by the retarder 4 is utilized to facilitate rapid cold start of the engine 2. The thermostat 9 and the engine outlet water temperature sensor 12 monitor the system's circulating medium temperature, ensuring that the system's circulating medium circulates between the engine 2 and the retarder 4 during a cold start of the engine 2 until the engine 2 starts normally.

[0055] As attached Figure 2 As shown, when the temperature of the circulating fluid in the system rises to a certain value, it is monitored by the engine water outlet temperature sensor 12 and the thermostat 9, causing the system circulating medium to circulate through the engine bypass water path formed between the radiator 1 and the engine 2. This is the engine bypass water path cooling that ensures that the engine 2 operates within a relatively suitable temperature range during normal vehicle driving, thereby optimizing engine performance.

[0056] As attached Figure 3 As shown, during a short-duration hydraulic retarding braking operation on a small slope, the retarder 4 operates with a partial fill, meaning only a portion of the working medium is contained within the retarder 4. Heat is generated during operation, and to maintain excellent braking performance, this heat must be dissipated promptly. The combined action of the engine 2, the engine outlet water temperature sensor 12, the retarder 4, the heat exchanger 5, and the intercooler 8 allows the generated heat to be promptly dissipated into the atmosphere, ensuring that the cooling medium continuously exchanges heat with the working medium.

[0057] During this operation, the feedback principle is used to guide some of the cooled circulating water back to the inlet of the retarder 4 through the check valve 13. The circulating medium that has been partially cooled by the intercooler 8 and then directed back meets the circulating medium on the main line that has been cooled by the engine 2 at the inlet of the retarder 4, where it then exchanges heat with the heat generated by the operation of the retarder 4, thereby achieving excellent braking performance of the retarder 4.

[0058] As attached Figure 4As shown, during a long-term hydraulic retarding braking operation on a steep slope, the retarder 4 operates at a high or even full fill rate. Under these conditions, the retarder 4 generates a significant amount of heat during braking. If the cooling cycle remains at a low fill rate, the required cooling capacity will be insufficient, thus affecting the braking performance of the retarder 4 and posing a safety hazard to the vehicle. Under these conditions, the circulating medium loop not only circulates between the engine 2, the retarder heat exchanger 5, the intercooler 8, and the retarder 4, but also incorporates an engine bypass water circuit, forming a large loop for efficient cooling.

[0059] During long periods of slow braking on steep slopes, with the retarder fluid filling rate at 75% or even 100%, the circulating medium will be circulated in the outer layer by pressing the fluctuation control button on the driving console. If necessary, the electronic fan 6 will also be activated to enhance air convection cooling.

[0060] The driving pump 11 in the circulation loop under various working conditions is used to promote the flow of the circulating medium and enhance the cooling effect; the check valve 13 is used to ensure that the circulating medium can only flow in one direction, so that it flows according to the predetermined circulation loop; the second three-way valve 14 with a sensor and the first three-way valve 10 receive instructions from the controller to control the on and off of the circulation loop.

[0061] The above description is merely an example of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A heat dissipation method for a hydraulic retarder heat dissipation system with a warm-up function, the hydraulic retarder heat dissipation system comprising a controller, a radiator (1), an engine (2), a transmission (3), a retarder (4), a retarder heat exchanger (5), an electronic fan (6), an intercooler (8), a thermostat (9), a drive pump (11), an engine water outlet temperature sensor (12), a check valve (13), a first three-way valve (10), and a second three-way valve (14); in, The water inlet and outlet of the radiator (1) are connected to the water inlet of the engine (2) through a cooling pipe. The engine (2) is connected to the transmission (3). The transmission (3) is connected to the retarder (4). The water inlet of the engine (2) and the water inlet of the radiator (1) are connected to the water inlet of the retarder heat exchanger (5) through a cooling pipe. The water outlet of the retarder heat exchanger (5) is connected to the water inlet of the intercooler (8) through a cooling pipe. The water outlet of the intercooler (8) is connected to the water inlet of the intercooler (8). The end is connected to the inlet of the retarder (4) through a cooling pipeline, the water outlet of the intercooler (8) is also connected to the water inlet of the engine (2) and the water inlet of the radiator (1) through a cooling pipeline, the inlet of the retarder (4) is also connected to the water outlet of the engine (2) and the water inlet of the engine (2) through cooling pipelines, and the outlet of the retarder (4) is connected to the water inlet of the retarder heat exchanger (5) through a cooling pipeline. It is characterized in that the heat dissipation method includes the following working conditions: 1) Under the cold start condition of the engine (2), the thermostat (9) and the engine outlet water temperature sensor (12) monitor the temperature of the circulating medium of the heat dissipation system and feed back to the controller. The controller enables the circulating medium to circulate between the engine (2) and the retarder (4) through the cooling pipe under the cold start condition of the engine (2). The heat generated by the retarder (4) warms up the engine (2) until the engine (2) starts normally. 2) After the engine (2) is normally started and the vehicle is running normally, the temperature of the circulating medium in the cooling system rises to a preset value m, which is monitored by the engine water outlet temperature sensor (12) and the thermostat (9) and fed back to the controller. The controller controls the retarder (4) to stop working and allows the circulating medium to circulate through the engine bypass water channel formed between the radiator (1) and the engine (2) through the cooling pipe, thereby ensuring that the engine (2) operates within a suitable temperature range; 3) Under the hydraulic retarding braking condition of a small slope and a short time, the controller causes the circulating medium to circulate between the engine (2), the retarder heat exchanger (5), the intercooler (8) and the retarder (4), thereby maintaining the braking performance of the retarder (4); During this operation, part of the cooled circulating medium is led back to the inlet of the retarder (4) through the check valve (13), and part of the circulating medium cooled by the intercooler (8) and then led back to the inlet of the retarder (4) is combined with the circulating medium cooled by the engine (2) and then exchanges heat with the heat generated by the operation of the retarder (4), thereby maintaining the braking performance of the retarder (4).

2. The heat dissipation method according to claim 1, wherein: Also includes: 4) Under the condition of long-term hydraulic retarding braking on a large slope, the controller causes the circulating medium to circulate between the engine (2), the retarder heat exchanger (5), the intercooler (8) and the retarder (4), and also circulate between the engine bypass water channel formed between the radiator (1) and the engine (2), thereby forming a large cycle for efficient cooling.

3. The heat dissipation method according to claim 2, wherein: The controller controls the electronic fan (6) to start up and strengthen the air convection cooling; the driving pump (11) in the circulation loop promotes the flow of the circulating medium.

4. The heat dissipation method according to claim 3, wherein: The check valve (13) allows the circulation to flow in only one direction, thereby flowing according to a predetermined circulation loop; the second three-way valve (14) with a sensor and the first three-way valve (10) receive instructions from the controller to control the on and off of the circulation loop.

5. The heat dissipation method according to claim 1, wherein: The thermostat (9) is installed on a cooling pipeline between the water inlet end of the radiator (1), the water inlet end of the engine (2) and the water inlet end of the retarder heat exchanger (5).

6. The heat dissipation method according to claim 1, wherein: The driving pump (11) is installed at the water inlet end of the engine (2), and the engine water outlet temperature sensor (12) is installed at the water outlet end of the engine (2).

7. The heat dissipation method according to claim 6, wherein: The check valve (13) is installed on the cooling pipeline between the water outlet of the intercooler (8) and the inlet of the retarder (4); the second three-way valve (14) is connected to the water inlet of the engine (2), the water inlet of the retarder heat exchanger (5) and the outlet of the retarder (4) respectively; and the first three-way valve (10) is connected to the water outlet of the engine (2), the water inlet of the engine (2) and the inlet of the retarder (4) respectively.

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