Cooling system for range extender and vehicle

Abstract

The utility model relates to a cooling system for a range extender and a vehicle, and is applied to the technical field of new energy power. The system comprises a range extender assembly, a cooling module and a control module, wherein the range extender assembly comprises an engine and a range extender generator; the cooling module comprises a cooling water pump, a three-way electromagnetic valve and an electronic water pump; the control module is at least electrically connected to one of the three-way electromagnetic valve and the electronic water pump; the three-way solenoid valve, the cooling water pump and the engine are connected in series to form a first cooling loop. The control module is electrically connected with the three-way solenoid valve. The three-way solenoid valve, the electronic water pump, the range extender generator, the cooling water pump and the engine are connected in series to form a second cooling loop, and the control module is electrically connected with the electronic water pump and the three-way solenoid valve. Based on a traditional engine cooling system framework, cooling of the range extender assembly can be achieved only by additionally arranging the electronic water pump and the three-way electromagnetic valve, and the cooling system is small in overall modification, simple in structure and low in manufacturing cost.

Description

Technical Field

[0001] This application relates to the field of new energy power technology, and in particular to a cooling system and vehicle for a range extender. Background Technology

[0002] With increasingly stringent global environmental regulations and accelerated energy structure transformation, range-extended electric power systems have been widely adopted in the fields of road vehicles and construction machinery due to their advantage in range.

[0003] This technology compensates for the energy density limitations of pure electric systems by generating electricity in real time through the range extender, effectively alleviating the bottlenecks in the driving range and continuous operation capability of pure electric machinery. However, the heat accumulation effect generated by the range extender under high load conditions can easily lead to reliability risks such as performance degradation of the electronic control unit and accelerated thermal aging of key components.

[0004] Current range-extended electric vehicle (REEV) cooling technologies still have significant limitations. For example, traditional air-cooling solutions are limited by the efficiency of air convection heat transfer, making it difficult to meet the heat dissipation requirements of high-power-density REEVs; while liquid-cooling systems improve heat dissipation efficiency, they have inherent drawbacks such as complex piping structures, high manufacturing costs, and large space occupancy. Utility Model Content

[0005] Therefore, it is necessary to provide a cooling system and vehicle for range extenders that addresses the problems of complex structure and high cost of traditional range extender generator water cooling systems.

[0006] In a first aspect, this application provides a cooling system for a range extender, employing the following technical solution:

[0007] A cooling system for a range extender includes a range extender assembly, a cooling module, and a control module. The range extender assembly includes an engine and a range extender generator. The cooling module includes a cooling water pump, a three-way solenoid valve, and an electric water pump. The control module is electrically connected to at least one of the three-way solenoid valve and the electric water pump. The three-way solenoid valve, the cooling water pump, and the engine are connected in series via pipes to form a first cooling circuit, and the control module is electrically connected to the three-way solenoid valve. The three-way solenoid valve, the electric water pump, the range extender generator, the cooling water pump, and the engine are connected in series via pipes to form a second cooling circuit, and the control module is electrically connected to both the electric water pump and the three-way solenoid valve.

[0008] In one embodiment, the engine and the range extender generator are mechanically coupled to form the range extender assembly.

[0009] In one embodiment, the cooling module further includes a cooling water tank, and the cooling water tank, three-way solenoid valve, cooling water pump and engine are connected in series through pipelines to form a first cooling circuit; the cooling water tank, three-way solenoid valve, electric water pump, range extender generator, cooling water pump and engine are connected in series through pipelines to form a second cooling circuit.

[0010] In one embodiment, the outlet of the cooling water tank is connected to the inlet of the three-way solenoid valve, and the inlet of the cooling water tank is connected to the outlet of the engine.

[0011] In one embodiment, the three-way solenoid valve includes a first outlet valve and a second outlet valve. The first outlet valve is connected to the inlet of the cooling water pump, and the second outlet valve is connected to the inlet of the electronic water pump. The three-way solenoid valve is electrically connected to the control module, and the inlet of the three-way solenoid valve can selectively connect to either the first outlet valve or the second outlet valve.

[0012] In one embodiment, the control module includes a temperature sensor and a control unit. The temperature sensor is used to acquire the real-time temperature of the range extender generator. The control unit is electrically connected to the temperature sensor and is used to: connect the inlet of the three-way solenoid valve to the first outlet valve when the real-time temperature is less than or equal to a first preset temperature; connect the inlet of the three-way solenoid valve to the second outlet valve when the real-time temperature is greater than the first preset temperature and less than or equal to a second preset temperature, and shut down the electronic water pump; and connect the inlet of the three-way solenoid valve to the second outlet valve when the real-time temperature is greater than the second preset temperature, and start the electronic water pump.

[0013] In one embodiment, the cooling water pump is configured to start and stop synchronously with the range extender assembly; the electric water pump is configured to continue operating after the range extender assembly and the cooling water pump are shut down until the real-time temperature is less than or equal to the first preset temperature.

[0014] In one embodiment, the range extender cooling system further includes a thermostat, which includes a low-temperature operating mode and a normal-temperature operating mode. The thermostat is capable of acquiring the current temperature of the engine. When the current temperature is less than a third preset temperature, the thermostat operates in the low-temperature operating mode; when the current temperature is greater than the third preset temperature, the thermostat operates in the normal-temperature operating mode.

[0015] In one embodiment, when the thermostat operates in the low-temperature mode, the thermostat, the coolant pump, and the engine are connected in series via pipes to form a third cooling circuit, and the thermostat, the coolant tank, and the coolant pump are connected in series via pipes to form a fourth cooling circuit, wherein the coolant flow rate in the third cooling circuit is greater than the coolant flow rate in the fourth cooling circuit; when the thermostat operates in the normal-temperature mode, the thermostat, the coolant tank, the coolant pump, and the engine are connected in series via pipes to form a fifth cooling circuit, wherein the coolant flow rate in the fifth cooling circuit is greater than the coolant flow rate in the third cooling circuit.

[0016] Secondly, this application provides a vehicle that adopts the following technical solution:

[0017] A vehicle comprising the aforementioned cooling system for a range extender.

[0018] The aforementioned cooling system for the range extender is based on the traditional engine cooling system architecture. It only requires the addition of an electric water pump and a three-way solenoid valve to simultaneously cool both the engine and the range extender generator. The overall cooling system requires minimal modification, has a simple structure, and low manufacturing cost. Furthermore, the control module can precisely control the opening and closing of the three-way solenoid valve and the electric water pump based on the real-time temperature of the range extender generator, thereby improving cooling efficiency and reducing energy loss. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the water circuit of the cooling system in the first operating mode according to an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the water circuit of the cooling system in the second operating mode according to one embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the water circuit of the cooling system in the third operating mode according to one embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the water circuit when the thermostat is in low-temperature operation mode in one embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the water circuit when the thermostat is in normal temperature operation mode according to one embodiment of this application.

[0024] Attached image annotations:

[0025] 1. Engine; 2. Range extender generator; 3. Cooling water pump; 4. Three-way solenoid valve; 41. First outlet valve; 42. Second outlet valve; 5. Electric water pump; 6. Cooling water tank; 7. Control module; 8. Thermostat. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] With increasingly stringent global environmental regulations and accelerated energy structure transformation, range-extended electric vehicles (REEVs) are being widely adopted in road vehicles and construction machinery due to their superior range. This technology compensates for the energy density limitations of pure electric systems by generating electricity in real time through the range extender, effectively alleviating the bottlenecks in the driving range and continuous operation capability of pure electric machinery.

[0033] However, the heat buildup effect generated by the range extender under high load conditions can easily lead to reliability risks such as performance degradation of the electronic control unit and accelerated thermal aging of key components, posing a severe challenge to the heat dissipation efficiency of the thermal management system. Current range extender cooling technologies still have significant limitations: traditional air-cooling solutions are limited by the efficiency of air convection heat transfer, making it difficult to meet the heat dissipation requirements of high power density range extenders; while liquid cooling systems improve heat dissipation efficiency, they have inherent drawbacks such as complex piping structures, high manufacturing costs, and large space occupancy.

[0034] More importantly, existing cooling control strategies mostly adopt fixed threshold adjustment modes and lack intelligent control mechanisms based on dynamic response to operating parameters, resulting in a technical contradiction between redundant cooling power consumption and insufficient heat dissipation capacity under partial load conditions.

[0035] Therefore, there is an urgent need for a cooling system for range extenders that is highly efficient in heat dissipation, has a compact system configuration, is cost-controllable, and has adaptive adjustment capabilities.

[0036] The following is in conjunction with the appendix Figure 1-5 The embodiments of this application will be described in further detail. Figures 1 to 3In the diagram, dashed lines represent communication and control wiring harnesses, solid lines with solid arrows represent cooling water circuits and flow directions, and solid lines with hollow arrows represent the circulation diagram of the water circuit under the current operating mode. Figure 4 In the diagram, the solid hollow arrow indicates the third cooling circuit, and the dashed hollow arrow indicates the fourth cooling circuit. Figure 5 In the middle, the hollow arrow on the broken line indicates the fifth cooling circuit.

[0037] See Figure 1 and Figure 2 As shown, Figure 1 This invention illustrates a water circuit diagram of the cooling system in a first operating mode according to an embodiment of the present application. Figure 2 A schematic diagram of the water circuit of the cooling system in a second operating mode according to an embodiment of this application is shown. An embodiment of this application provides a cooling system for a range extender, comprising at least a range extender assembly, a cooling module, and a control module 7. The range extender assembly includes an engine 1 and a range extender generator 2. The cooling module includes a cooling water pump 3, a three-way solenoid valve 4, and an electric water pump 5. The control module 7 is electrically connected to at least one of the three-way solenoid valve 4 and the electric water pump 5.

[0038] by Figure 1 As shown in the example, the three-way solenoid valve 4, the coolant pump 3, and the engine 1 are connected in series through a pipeline filled with coolant to form the first cooling circuit. At this time, the control module 7 is electrically connected to the three-way solenoid valve 4. Figure 2 As shown in the example, the three-way solenoid valve 4, the electronic water pump 5, the range extender generator 2, the cooling water pump 3 and the engine 1 are connected in series through a pipeline filled with coolant to form a second cooling circuit. At this time, the control module 7 is electrically connected to the electronic water pump 5 and the three-way solenoid valve 4 respectively.

[0039] Specifically, during vehicle operation, the control module 7 acquires the real-time temperature T of the range extender generator 2, and then selects one of the first and second cooling circuits to conduct based on the acquired real-time temperature T, thereby achieving the cooling operation of the range extender assembly. This range extender cooling system, based on the traditional engine 1 cooling system architecture, only requires the addition of an electronic water pump 5 and a three-way solenoid valve 4 to simultaneously cool both the engine 1 and the range extender generator 2. The overall modification to the cooling system is minimal, the structure is simple, and the manufacturing cost is low.

[0040] The control module 7 includes a temperature sensor (not shown) and a control unit (not shown). The temperature sensor is used to obtain the coolant temperature at the outlet of the range extender generator 2 to obtain the real-time temperature T of the range extender generator 2. The control unit is electrically connected to the temperature sensor and is used to control the opening and closing states of the three-way solenoid valve 4 and the electric water pump 5 according to the obtained real-time temperature T.

[0041] In this embodiment, the control module 7 enables the cooling system for the range extender to precisely control the opening and closing states of the three-way solenoid valve 4 and the electronic water pump 5 based on the real-time temperature of the range extender generator 2, thereby improving the cooling effect while reducing energy loss.

[0042] In this embodiment, the engine 1 and the range extender generator 2 are mechanically coupled to form the aforementioned range extender assembly, and both belong to the power generation unit of the range-extended power system. In the power system of new energy vehicles, the power generation unit plays the role of an auxiliary energy source in the power system architecture. The control module 7 can specifically be a range extender controller (RECU).

[0043] Continue reading Figure 1 As shown, in some embodiments, the cooling module further includes a cooling water tank 6 for storing coolant. Specifically, the outlet of the cooling water tank 6 is connected to the inlet of the three-way solenoid valve 4, and the inlet of the cooling water tank 6 is connected to the outlet of the engine 1.

[0044] In this embodiment, the cooling water tank 6, the three-way solenoid valve 4, the cooling water pump 3, and the engine 1 are connected in series through pipelines to form the first cooling circuit described above. When the first cooling circuit is open, the coolant circulates in the pipelines to achieve local cooling of the engine 1. The cooling water tank 6, the three-way solenoid valve 4, the electric water pump 5, the range extender generator 2, the cooling water pump 3, and the engine 1 are connected in series through pipelines to form the second cooling circuit described above to achieve overall cooling of the range extender assembly.

[0045] by Figure 1 As shown in the example, the three-way solenoid valve 4 includes a first outlet valve port 41 and a second outlet valve port 42 arranged at intervals. The first outlet valve port 41 is used to connect to the inlet of the cooling water pump 3, and the second outlet valve port 42 is used to connect to the inlet of the electronic water pump 5. The three-way solenoid valve 4 is electrically connected to the control module 7. The inlet of the three-way solenoid valve 4 can be connected to either the first outlet valve port 41 or the second outlet valve port 42 according to actual needs, so as to realize the switching of the first cooling circuit and the second cooling circuit.

[0046] When the range extender is in operation, the control module 7 can set a first preset temperature and a second preset temperature, and regulate the cooling operation of the cooling system based on the first preset temperature and the second preset temperature as target values. In this embodiment, the first preset temperature is defined as a low-temperature target value T1, the second preset temperature is defined as a high-temperature target value T2, and the temperature of the range extender generator 2 collected by the temperature sensor is defined as the real-time temperature T. The control module 7 regulates the three-way solenoid valve 4 and the electric water pump 5 according to the temperature range of the real-time temperature T, thereby realizing different cooling modes.

[0047] Specifically, this application provides three cooling modes based on temperature range variations. For ease of description, these three cooling modes are respectively named the first operating mode, the second operating mode, and the third operating mode in this embodiment.

[0048] For details, please refer to [link / reference]. Figure 1 As shown, when the real-time temperature T is less than or equal to the first preset temperature T1, the range extender generator 2 has a low temperature and does not require cooling. The control unit controls the inlet of the three-way solenoid valve 4 to connect with the first outlet valve 41 and isolate it from the second outlet valve 42. That is, the three-way solenoid valve 4 switches to the path leading to the cooling water pump 3, while the path leading to the electronic water pump 5 is closed, thus making the first cooling circuit conductive. At this time, the cooling water circuit where the range extender generator 2 is located, i.e., the second cooling water circuit, is in a non-flowing state. The entire cooling system only needs to maintain the cooling requirements of the engine 1, which can effectively reduce cooling energy consumption.

[0049] When the cooling system is running in the first operating mode, the coolant flows out from the outlet of the cooling water tank 6, flows through the pipeline in sequence through the three-way solenoid valve 4, the cooling water pump 3 and the engine 1, and then flows back into the cooling water tank 6, thus completing the pumping and circulation of the coolant in the first cooling circuit.

[0050] See Figure 2 As shown, when the real-time temperature T is greater than the first preset temperature T1 and less than or equal to the second preset temperature T2, the control unit determines that the range extender assembly needs cooling and controls the inlet of the three-way solenoid valve 4 to connect with the second outlet valve 42 and isolate it from the first outlet valve 41, thus opening the second cooling circuit. That is, the three-way solenoid valve 4 switches to the path leading to the electric water pump 5, while the path leading to the cooling water pump 3 is closed, and the cooling water circuits of the engine 1 and the range extender generator 2 are in series.

[0051] Under this operating condition, there is no need to start the electronic water pump 5; the cooling demand can be met simply by relying on the cooling water pump 3 for low-flow cooling circulation. When the real-time temperature T drops to less than or equal to the first preset temperature T1, the cooling system returns to the first operating mode described above.

[0052] Combination Figure 3 As shown, Figure 3 A schematic diagram of the water circuit of the cooling system in the third operating mode according to an embodiment of this application is shown. When the real-time temperature T is greater than the second preset temperature T2, the control unit determines that the overall temperature of the range extender assembly is too high and that the cooling effect needs to be further enhanced. Therefore, the electronic water pump 5 is started. At this time, the cooling water pump 3 and the electronic water pump 5 run simultaneously to perform high-flow-rate circulating cooling. When the real-time temperature drops to the range of T1 < T ≤ T2, the cooling system returns to the second operating mode described above.

[0053] In this embodiment, the cooling water pump 3 is configured to start and stop synchronously with the range extender assembly; the electronic water pump 5 is configured to continue running for a first preset time after the range extender assembly and cooling water pump 3 are shut down. When the range extender generator 2 stops generating electricity and the engine 1 is turned off, the engine 1 cooling water pump 3 immediately stops operating. At this time, the electronic water pump 5 continues to operate, simultaneously providing low-flow circulating cooling to both the engine 1 and the range extender generator 2. When the detected real-time temperature T, i.e., the temperature of the range extender generator 2, drops to T≤T1, the electronic water pump 5 is shut off, the three-way solenoid valve 4 switches to the path leading to the cooling water pump 3, and the entire cooling system stops working.

[0054] The cooling system for the range extender designed as described above can precisely control the opening and closing states of the three-way solenoid valve 4 and the electric water pump 5 based on the real-time temperature of the range extender generator 2, thereby ensuring the best cooling effect and the lowest energy loss.

[0055] See Figure 4 and Figure 5 As shown, Figure 4 This illustration shows a water circuit diagram when the thermostat is in low-temperature operation mode according to one embodiment of this application. Figure 5 The diagram shows a water circuit when the thermostat is in normal temperature operation mode according to one embodiment of this application. In some embodiments, the cooling system for the range extender also includes a thermostat 8, which achieves a precise balance between energy efficiency, component life and system reliability by intelligently regulating the flow and heat dissipation intensity of the cooling medium. It is a key functional unit for improving the overall performance of the transmission system.

[0056] In this embodiment, the thermostat 8 has a low-temperature operating mode and a normal-temperature operating mode. The thermostat 8 can obtain the current temperature of the engine 1 and switch between the low-temperature operating mode and the normal-temperature operating mode according to the obtained current temperature. When the current temperature is lower than a third preset temperature, the thermostat 8 operates in the low-temperature operating mode; when the current temperature is higher than the third preset temperature, the thermostat 8 operates in the normal-temperature operating mode.

[0057] Specifically, when the thermostat 8 operates in low-temperature mode, the thermostat 8, the coolant pump 3, and the engine 1 are connected in series via a pipe filled with coolant to form a third cooling circuit, and the thermostat 8, the coolant tank 6, and the coolant pump 3 are connected in series via a pipe to form a fourth cooling circuit. In this embodiment, the coolant flow rate in the third cooling circuit is greater than the coolant flow rate in the fourth cooling circuit.

[0058] In this embodiment, when the coolant temperature of the engine 1 is low, the thermostat 8 operates in a low-temperature mode and closes most of the water passages leading to the coolant tank 6, so that most of the coolant circulates in the engine 1 along the third cooling circuit, and only a small portion of the coolant flows through the coolant tank 6 along the fourth cooling circuit. This can accelerate the warm-up of the engine 1, allowing the engine 1 to quickly reach its optimal operating temperature, reducing wear and fuel consumption.

[0059] When the thermostat 8 is running in normal temperature mode, the thermostat 8, the coolant tank 6, the coolant pump 3 and the engine 1 are connected in series through pipes filled with coolant to form a fifth cooling circuit. The coolant flow rate in the fifth cooling circuit is greater than the coolant flow rate in the third cooling circuit.

[0060] In this embodiment, after the engine 1 reaches normal operating temperature, the thermostat 8 opens and the small circulation channel from the thermostat 8 to the cooling water pump 3 closes. The coolant flows through the radiator for large circulation, dissipating heat through the radiator to prevent the engine 1 from overheating and to keep the coolant temperature of the engine 1 within a relatively stable range, thereby extending the overall service life of the transmission system.

[0061] In some embodiments, this application also provides a vehicle, specifically a new energy vehicle, which includes a cooling system for a range extender as shown in any of the above embodiments.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A cooling system for a range extender, characterized in that, The cooling system for the range extender includes: Range extender assembly, including engine and range extender generator; The cooling module includes a cooling water pump, a three-way solenoid valve, and an electric water pump; and The control module is electrically connected to at least one of the three-way solenoid valve and the electronic water pump; The three-way solenoid valve, cooling water pump, and engine are connected in series via pipelines to form a first cooling circuit, and the control module is electrically connected to the three-way solenoid valve. The three-way solenoid valve, electric water pump, range extender generator, cooling water pump and engine are connected in series through pipelines to form a second cooling circuit, and the control module is electrically connected to the electric water pump and the three-way solenoid valve respectively.

2. The cooling system for a range extender according to claim 1, characterized in that, The engine and the range extender generator are mechanically coupled to form the range extender assembly.

3. The cooling system for a range extender according to claim 1, characterized in that, The cooling module also includes a cooling water tank, and the cooling water tank, three-way solenoid valve, cooling water pump and engine are connected in series through pipelines to form the first cooling circuit; the cooling water tank, three-way solenoid valve, electric water pump, range extender generator, cooling water pump and engine are connected in series through pipelines to form the second cooling circuit.

4. The cooling system for a range extender according to claim 3, characterized in that, The outlet of the cooling water tank is connected to the inlet of the three-way solenoid valve, and the inlet of the cooling water tank is connected to the outlet of the engine.

5. The cooling system for a range extender according to any one of claims 1-4, characterized in that, The three-way solenoid valve includes a first outlet valve and a second outlet valve. The first outlet valve can be connected to the inlet of the cooling water pump, and the second outlet valve can be connected to the inlet of the electronic water pump. The three-way solenoid valve is electrically connected to the control module, and the inlet of the three-way solenoid valve can be connected to either the first outlet valve or the second outlet valve.

6. The cooling system for a range extender according to claim 5, characterized in that, The control module includes a temperature sensor and a control unit. The temperature sensor is used to acquire the real-time temperature of the range extender generator, and the control unit is electrically connected to the temperature sensor for: When the real-time temperature is less than or equal to the first preset temperature, the inlet of the three-way solenoid valve is connected to the outlet of the first water valve. When the real-time temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the inlet of the three-way solenoid valve is connected to the outlet of the second water valve, and the electronic water pump is turned off. When the real-time temperature is greater than the second preset temperature, the inlet of the three-way solenoid valve is connected to the outlet of the second water valve, and the electronic water pump is started.

7. The cooling system for a range extender according to claim 6, characterized in that, The cooling water pump is configured to start and stop synchronously with the range extender assembly; the electric water pump is configured to continue operating after the range extender assembly and the cooling water pump are shut down until the real-time temperature is less than or equal to the first preset temperature.

8. The cooling system for a range extender according to claim 3, characterized in that, The cooling system for the range extender also includes a thermostat, which includes a low-temperature operating mode and a normal-temperature operating mode. The thermostat can obtain the current temperature of the engine. When the current temperature is lower than a third preset temperature, the thermostat operates in the low-temperature operating mode. When the current temperature is greater than the third preset temperature, the thermostat operates in normal temperature mode.

9. The cooling system for a range extender according to claim 8, characterized in that, When the thermostat is in the low-temperature operating mode, the thermostat, the coolant pump and the engine are connected in series through pipes to form a third cooling circuit, and the thermostat, the coolant tank and the coolant pump are connected in series through pipes to form a fourth cooling circuit. The coolant flow rate in the third cooling circuit is greater than the coolant flow rate in the fourth cooling circuit. When the thermostat is in the normal temperature operating mode, the thermostat, coolant tank, coolant pump and engine are connected in series through pipelines to form a fifth cooling circuit, and the coolant flow rate in the fifth cooling circuit is greater than the coolant flow rate in the third cooling circuit.

10. A vehicle, characterized in that, Includes the cooling system for range extenders as described in any one of claims 1-9.

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