An electric vehicle cooling system, control method and electric vehicle

Abstract

The application discloses an electric automobile cooling system, a control method and an electric automobile, and relates to the technical field of electric automobiles, and aims at solving the problems of low energy efficiency and short driving range of the electric automobile. The application utilizes the heat generated by the driving motor during operation to heat the lubricating oil of the speed reducer, improves the energy efficiency, and improves the driving range of the electric automobile by spraying the heated lubricating oil to the gear of the speed reducer through the nozzle of the oil injection pump to avoid the problem of low temperature and increased viscosity of the lubricating oil. When the temperature of the lubricating oil is too high, the vehicle controller controls the three-way valve to connect the circuit where the heat dissipation device is located to cool the lubricating oil, avoids the problem of high temperature of the lubricating oil, and improves the service life of the lubricating oil and the speed reducer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric vehicle technology, and particularly relates to an electric vehicle cooling system, a control method and an electric vehicle. BACKGROUND

[0002] In the field of electric vehicle technology, due to the output power characteristics of the electric motor, a reducer is usually used as an effective technical means to increase the output torque of the electric motor and change the overall transmission ratio of the electric vehicle. By setting the reducer, the speed of the electric motor can be easily increased to obtain better acceleration performance in the high-speed section, thereby avoiding the defect that the output torque of the electric motor is difficult to increase at high speed.

[0003] Under normal circumstances, in order to achieve higher load and longer service life, lubricating oil is often used as a lubricating medium in the reducer. The viscosity of lubricating oil is high at low temperature, and the lubrication performance is poor. At the same time, due to the high viscosity, it will also bring additional resistance to the reducer, thereby causing additional torque loss, which is directly manifested as a decrease in the range of electric vehicles. SUMMARY

[0004] The present application provides an electric vehicle cooling system, a control method and an electric vehicle, which can heat the lubricating oil by using the heat generated by the operation of the motor, thereby improving the energy efficiency and the range of the electric vehicle.

[0005] In a first aspect, the present application provides an electric vehicle cooling system, comprising a vehicle controller, a motor cooler, an oil injection pump, a three-way valve, an electric oil pump and a heat dissipation device.

[0006] The oil outlet of the motor cooler is connected with the oil inlet of the oil injection pump, the oil outlet of the oil injection pump is connected with the oil inlet of the electric oil pump, and the oil injection pump is used to spray oil to the gear of the reducer of the electric vehicle.

[0007] The oil outlet of the electric oil pump is connected with the oil inlet of the three-way valve.

[0008] The first oil outlet of the three-way valve is connected with the oil inlet of the motor cooler, the second oil outlet of the three-way valve is connected with the oil inlet of the heat dissipation device, and the oil outlet of the heat dissipation device is connected with the oil inlet of the motor cooler.

[0009] The vehicle controller is electrically connected with the oil injection pump, the three-way valve, the electric oil pump and the heat dissipation device respectively.

[0010] Optionally, the electric vehicle cooling system further comprises an expansion tank, the oil inlet of the expansion tank is connected with the oil outlet of the electric oil pump, and the oil outlet of the expansion tank is connected with the oil inlet of the electric oil pump.

[0011] Optionally, the heat dissipation device comprises a forced air cooling radiator.

[0012] Optionally, the heat dissipation device comprises a heat exchanger, an electric water pump, a forced air cooling radiator and an expansion water tank.

[0013] The oil inlet of the heat exchanger is connected with the second oil outlet of the three-way valve, and the oil outlet of the heat exchanger is connected with the oil inlet of the motor cooler.

[0014] The water outlet of the heat exchanger is connected with the water inlet of the electric water pump, the water outlet of the electric water pump is connected with the water inlet of the forced air cooling radiator, and the water outlet of the forced air cooling radiator is connected with the water inlet of the heat exchanger.

[0015] The water inlet of the expansion water tank is connected with the water outlet of the electric water pump, and the water outlet of the expansion water tank is connected with the water inlet of the heat exchanger.

[0016] The electric water pump and the forced air cooling radiator are connected with the vehicle controller.

[0017] Optionally, the heat dissipation device further comprises a water-cooled three-way valve, an air conditioner heat exchanger, a cooling liquid pump and an air conditioner refrigeration device.

[0018] The water inlet of the water-cooled three-way valve is connected with the water outlet of the electric water pump, the first water outlet of the water-cooled three-way valve is connected with the water inlet of the forced air cooling radiator, the second water outlet of the water-cooled three-way valve is connected with the water inlet of the air conditioner heat exchanger, and the water outlet of the air conditioner heat exchanger is connected with the water inlet of the heat exchanger.

[0019] The outlet of the air conditioner heat exchanger is connected with the inlet of the cooling liquid pump, the outlet of the cooling liquid pump is connected with the inlet of the air conditioner refrigeration device, and the outlet of the air conditioner refrigeration device is connected with the inlet of the air conditioner heat exchanger.

[0020] The water-cooled three-way valve, the cooling liquid pump and the air conditioner refrigeration device are electrically connected with the vehicle controller.

[0021] Optionally, the electric vehicle cooling system further comprises an oil temperature sensor and a rotational speed sensor.

[0022] The oil temperature sensor is arranged in the oil injection pump and is electrically connected with the vehicle controller, and is used for detecting the oil temperature in the oil injection pump.

[0023] The rotational speed sensor is connected with the vehicle controller, and is used for detecting the rotational speed of the output shaft of the speed reducer.

[0024] Optionally, the electric vehicle cooling system comprises a first motor cooler, a second motor cooler, a first oil injection pump, a second oil injection pump, a first three-way valve, a second three-way valve, a first electric oil pump and a second electric oil pump, wherein the first motor cooler and the second motor cooler are respectively used for cooling the first motor and the second motor of the electric vehicle;

[0025] The oil outlet of the first motor cooler is connected with the oil inlet of the first oil injection pump, the oil outlet of the first oil injection pump is connected with the oil inlet of the second three-way valve, and the first oil injection pump is used for spraying oil to the gear of the first speed reducer connected with the first motor;

[0026] The first oil outlet of the second three-way valve is connected with the oil inlet of the first electric oil pump, and the second oil outlet of the second three-way valve is connected with the oil inlet of the second electric oil pump;

[0027] The oil outlet of the first electric oil pump is connected with the oil inlet of the first three-way valve, the first oil outlet of the first three-way valve is connected with the oil inlet of the first motor cooler, the second oil outlet of the first three-way valve is connected with the oil inlet of the heat dissipation device, and the oil outlet of the heat dissipation device is connected with the oil inlet of the first motor cooler;

[0028] The oil outlet of the second electric oil pump is connected with the oil inlet of the second motor cooler, the oil outlet of the first motor cooler is connected with the oil inlet of the second oil injection pump, the oil outlet of the second oil injection pump is connected with the oil inlet of the first electric oil pump, and the second oil injection pump is used for spraying oil to the gear of the second speed reducer connected with the second motor;

[0029] The vehicle controller is electrically connected with the first oil injection pump, the second oil injection pump, the first three-way valve, the second three-way valve, the first electric oil pump, the second electric oil pump and the heat dissipation device.

[0030] In a second aspect, the present application further provides an electric vehicle cooling system control method applied to the electric vehicle cooling system provided in the first aspect of the present application, comprising:

[0031] When the oil temperature in the oil injection pump is lower than a first preset value, the vehicle controller controls the three-way valve to act, and connects the circuit composed of the electric oil pump, the motor cooler and the oil injection pump;

[0032] When the heat generated by the operation of the motor of the electric vehicle causes the oil temperature to rise to a second preset value, the vehicle controller controls the three-way valve to act, and connects the circuit composed of the electric oil pump, the heat dissipation device, the motor cooler and the oil injection pump.

[0033] Optionally, in the process of heating the lubricating oil, the rotation speed of the electric oil pump is inversely proportional to the oil temperature, and the load of the fuel injection pump is proportional to the rotation speed of the output shaft of the speed reducer.

[0034] In the process of cooling the lubricating oil, the rotation speed of the electric oil pump is proportional to the oil temperature, and the load of the fuel injection pump is proportional to the rotation speed of the output shaft of the speed reducer.

[0035] In a third aspect, the present application further provides an electric vehicle comprising the electric vehicle cooling system according to the first aspect of the present application.

[0036] The electric vehicle cooling system provided by the present application comprises a vehicle controller, a motor cooler, a fuel injection pump, a three-way valve, an electric oil pump and a heat dissipation device. The oil outlet of the motor cooler is connected to the oil inlet of the fuel injection pump. The oil outlet of the fuel injection pump is connected to the oil inlet of the electric oil pump. The fuel injection pump is used to spray oil to the gear of the speed reducer of the electric vehicle. The oil outlet of the electric oil pump is connected to the oil inlet of the three-way valve. The first oil outlet of the three-way valve is connected to the oil inlet of the motor cooler. The second oil outlet of the three-way valve is connected to the oil inlet of the heat dissipation device. The oil outlet of the heat dissipation device is connected to the oil inlet of the motor cooler. The vehicle controller is electrically connected to the fuel injection pump, the three-way valve, the electric oil pump and the heat dissipation device respectively. The heat generated by the driving motor is used to heat the lubricating oil of the speed reducer in the embodiment of the present application. The heat generated by the driving motor during operation is effectively utilized, and the energy efficiency is improved. The heated lubricating oil is sprayed to the gear of the speed reducer through the nozzle of the fuel injection pump. The problem of reduced driving range of the electric vehicle caused by excessively low temperature and increased viscosity of the lubricating oil is avoided, and the driving range of the electric vehicle is improved. When the oil temperature of the lubricating oil is too high, the vehicle controller controls the three-way valve to connect the circuit where the heat dissipation device is located, so as to cool the lubricating oil. The problem of lubricating oil deterioration caused by excessively high temperature of the lubricating oil, which affects the lubricating effect of the speed reducer and further affects the service life of the speed reducer, is avoided. The service life of the lubricating oil and the speed reducer is improved.

[0037] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0038] The present application will be further described in detail below according to the drawings and embodiments.

[0039] Figure 1 A structural schematic diagram of an electric vehicle cooling system provided by the embodiment of the present application;

[0040] Figure 2 A structural schematic diagram of another electric vehicle cooling system provided by the embodiment of the present application;

[0041] Figure 3 Another structural schematic diagram of an electric vehicle cooling system provided by an embodiment of the present application is shown in FIG. 6.

[0042] Figure 4 Another structural schematic diagram of an electric vehicle cooling system provided by an embodiment of the present application is shown in FIG. 6.

[0043] Figure 5 Another structural schematic diagram of an electric vehicle cooling system provided by an embodiment of the present application is shown in FIG. 6.

[0044] Figure 6 Another structural schematic diagram of an electric vehicle cooling system provided by an embodiment of the present application is shown in FIG. 6.

[0045] Figure 7 Another structural schematic diagram of an electric vehicle cooling system provided by an embodiment of the present application is shown in FIG. 6.

[0046] Figure 8 Another structural schematic diagram of an electric vehicle cooling system provided by an embodiment of the present application is shown in FIG. 6.

[0047] Figure 9 A flow chart of a control method of an electric vehicle cooling system provided by an embodiment of the present application is shown in FIG. 7. DETAILED DESCRIPTION

[0048] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects reached more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0049] In the description of the present application, unless otherwise explicitly specified and limited, the terms “connected”, “connected”, “fixed” should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0051] The embodiment of the present application provides a cooling system of an electric vehicle, which comprises a vehicle controller, a motor cooler, an oil injection pump, a three-way valve, an electric oil pump and a heat dissipation device.

[0052] The oil outlet of the motor cooler is connected with the oil inlet of the oil injection pump, the oil outlet of the oil injection pump is connected with the oil inlet of the electric oil pump, and the oil injection pump is used for spraying oil to the gear of the reducer of the electric vehicle.

[0053] The oil outlet of the electric oil pump is connected with the oil inlet of the three-way valve.

[0054] The first oil outlet of the three-way valve is connected with the oil inlet of the motor cooler, the second oil outlet of the three-way valve is connected with the oil inlet of the heat dissipation device, and the oil outlet of the heat dissipation device is connected with the oil inlet of the motor cooler.

[0055] The vehicle controller is electrically connected with the oil injection pump, the three-way valve, the electric oil pump and the heat dissipation device.

[0056] The above is the core idea of the present application, and the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the embodiments of the present application.

[0057] Figure 1 A structural schematic diagram of a cooling system of an electric vehicle provided by the embodiment of the present application is shown in the figure, which comprises a vehicle controller 110, a motor cooler 120, an oil injection pump 130, a three-way valve 140, an electric oil pump 150 and a heat dissipation device 160. Figure 1

[0058] ​The oil outlet of the motor cooler 120 is connected with the oil inlet of the oil injection pump 130, the oil outlet of the oil injection pump 130 is connected with the oil inlet of the electric oil pump 150, and the oil injection pump 130 is used for spraying oil to the gear of the reducer of the electric vehicle. The oil outlet of the electric oil pump 150 is connected with the oil inlet (1) of the three-way valve 140. The first oil outlet (2) of the three-way valve 140 is connected with the oil inlet of the motor cooler 120, the second oil outlet (3) of the three-way valve 140 is connected with the oil inlet of the heat dissipation device 160, and the oil outlet of the heat dissipation device 160 is connected with the oil inlet of the motor cooler 120.

[0059] The whole vehicle controller 110 is electrically connected with the oil injection pump 130, the three-way valve 140, the electric oil pump 150 and the heat dissipation device 160, and is used for controlling the working of the oil injection pump 130, the three-way valve 140, the electric oil pump 150 and the heat dissipation device 160.

[0060] The motor cooler 120 is used for cooling the driving motor (M) of the electric vehicle. In an example, the motor cooler 120 can include a plurality of pipelines for transmitting lubricating oil, and is arranged in the shell of the driving motor or is wound on the stator of the driving motor, so that the heat generated in the operation of the driving motor is transferred to the lubricating oil in the motor cooler by heat exchange, thereby heating the lubricating oil. At present, the water cooling scheme is usually used for cooling the driving motor in the industry, the cooling water flows through the motor, and a cooling circuit is separately formed, which has high cost, and the heat generated by the driving motor cannot be effectively utilized, and the energy efficiency is low. In the embodiment of the present application, the heat generated by the driving motor is used for heating the lubricating oil of the reducer, the heat generated in the operation of the driving motor is effectively utilized, and the energy efficiency is improved.

[0061] The oil injection pump 130 is provided with a nozzle, and the heated lubricating oil is sprayed to the gear of the reducer through the nozzle of the oil injection pump 130, so that the lubricating oil with appropriate temperature is provided for the reducer, the problem that the endurance mileage of the electric vehicle is reduced due to the low temperature and the increase of the viscosity of the lubricating oil is avoided, and the endurance mileage of the electric vehicle is improved. In an example, the flow of the lubricating oil sprayed from the nozzle of the oil injection pump 130 can be controlled by the whole vehicle controller 110, for example, the whole vehicle controller 110 controls the flow of the lubricating oil sprayed from the nozzle of the oil injection pump 130 by pulse width modulation. At present, the splash lubrication method is usually used for lubricating the reducer in the industry, that is, part of the gears of the reducer are soaked in the lubricating oil for cooling, and the oil is stirred and splashed to lubricate and cool the gears of the reducer when the gears rotate. The resistance is large when the gears of the reducer are stirred in the lubricating oil, and the transmission efficiency is low. In the embodiment of the present application, the oil is sprayed to the gears of the reducer by the oil injection pump, the resistance of the gear rotation is reduced, the transmission efficiency is improved, and the endurance mileage of the electric vehicle is improved.

[0062] The heat dissipation device 160 is used to cool the lubricating oil when the oil temperature is too high, so as to avoid the problem that the lubricating oil is deteriorated due to the too high lubricating oil temperature, the lubricating effect of the speed reducer is affected, and the service life of the speed reducer is affected, and the service life of the lubricating oil and the speed reducer is improved. The heat dissipation form of the heat dissipation device 160 can be air cooling, water cooling or a combination of the two, and the embodiment of the present application is not limited here.

[0063] For example, when the external environment temperature is lower than the preset temperature (for example, 35℃), and the oil temperature of the lubricating oil in the fuel injection pump 130 is lower than the first preset value (for example, 80℃), the vehicle controller 110 controls the oil inlet (1) and the first oil outlet (2) of the three-way valve 140 to be communicated, the oil inlet (1) and the second oil outlet (3) are closed, and the circuit formed by the electric oil pump 150, the motor cooler 120 and the fuel injection pump 130 is communicated, and the circuit in which the heat dissipation device 160 is located is closed, so that the lubricating oil can be quickly heated by the heat generated by the operation of the motor. The lubricating oil in the motor cooler 120 is heated by the heat generated by the operation of the driving motor. The heated lubricating oil is sprayed to the gear of the speed reducer through the nozzle of the fuel injection pump 130, so as to provide the speed reducer with lubricating oil with a suitable temperature. The lubricating oil flows back to the electric oil pump 150 through the outlet of the fuel injection pump 130, and the electric oil pump 150 pressurizes the lubricating oil, so that the lubricating oil in the pipeline has sufficient pressure, and the lubricating oil can flow through each position in the system.

[0064] After the lubricating oil is heated, the oil temperature rises, and when the oil temperature reaches the second preset value (for example, 85℃), the vehicle controller 110 controls the oil inlet (1) and the second oil outlet (3) of the three-way valve 140 to be communicated, the oil inlet (1) and the first oil outlet (2) are closed, and the circuit formed by the electric oil pump 150, the heat dissipation device 160, the motor cooler 120 and the fuel injection pump 130 is communicated. The vehicle controller 110 controls the heat dissipation device 160 to work to cool the lubricating oil in the pipeline. The cooled lubricating oil is sprayed to the gear of the speed reducer through the nozzle of the fuel injection pump 130, so as to provide the speed reducer with lubricating oil with a suitable temperature, avoid the problem that the lubricating oil is deteriorated due to the too high lubricating oil temperature, the lubricating effect of the speed reducer is affected, and the service life of the speed reducer is affected, and the service life of the lubricating oil and the speed reducer is improved.

[0065] The electric vehicle cooling system provided by the embodiment of the present application comprises a vehicle controller, a motor cooler, an oil injection pump, a three-way valve, an electric oil pump and a heat dissipation device, the oil outlet of the motor cooler is connected with the oil inlet of the oil injection pump, the oil outlet of the oil injection pump is connected with the oil inlet of the electric oil pump, the oil injection pump is used for spraying oil to the gear of the reducer of the electric vehicle, the oil outlet of the electric oil pump is connected with the oil inlet of the three-way valve, the first oil outlet of the three-way valve is connected with the oil inlet of the motor cooler, the second oil outlet of the three-way valve is connected with the oil inlet of the heat dissipation device, the oil outlet of the heat dissipation device is connected with the oil inlet of the motor cooler, and the vehicle controller is electrically connected with the oil injection pump, the three-way valve, the electric oil pump and the heat dissipation device respectively. The heat generated by the driving motor is used for heating the lubricating oil of the reducer, the heat generated during the operation of the driving motor is effectively utilized, and the energy efficiency is improved. The heated lubricating oil is sprayed to the gear of the reducer through the nozzle of the oil injection pump, the problem that the low temperature and the increased viscosity of the lubricating oil result in the reduction of the cruising range of the electric vehicle is avoided, and the cruising range of the electric vehicle is improved. When the oil temperature of the lubricating oil is too high, the vehicle controller controls the three-way valve to connect the loop in which the heat dissipation device is located, the lubricating oil is cooled, the problem that the high temperature of the lubricating oil results in the deterioration of the lubricating oil and affects the lubricating effect of the reducer and the service life of the reducer is avoided, and the service life of the lubricating oil and the reducer is improved.

[0066] In some embodiments of the present application, the electric vehicle cooling system further comprises an expansion tank, the oil inlet of the expansion tank is connected with the oil outlet of the electric oil pump, and the oil outlet of the expansion tank is connected with the oil inlet of the electric oil pump. Figure 1 As shown in FIG. 17, the electric vehicle cooling system further comprises an expansion tank 170, the oil inlet of the expansion tank 170 is connected with the oil outlet of the electric oil pump 150, and the oil outlet of the expansion tank 170 is connected with the oil inlet of the electric oil pump 150. The expansion tank 170 is usually not filled with lubricating oil and can function as pressure stabilizing. Specifically, since the electric vehicle cooling system is a closed oil circuit system, when the oil temperature in the pipeline changes, the volume of the lubricating oil will change accordingly, resulting in the change of the pressure. The expansion tank 170 provides sufficient volume expansion or contraction space for the lubricating oil, avoids the problem of pipeline damage caused by excessive or insufficient pressure in the pipeline, and improves the stability of the electric vehicle cooling system. The expansion tank 170 can also function as oil supplementing. When the lubricating oil consumption in the pipeline decreases, the expansion tank 170 can supplement the lubricating oil in the pipeline in time.

[0067] In some embodiments of the present application, the heat dissipation device can comprise an air-cooled radiator. As shown in FIG. 18, the heat dissipation device comprises an air-cooled radiator 180. Figure 1As shown, the heat dissipation device includes an air-cooled radiator 161, which includes a cooling fan. Lubricating oil within the pipes exchanges heat with the air-cooled radiator 161, transferring heat to its surface. The cooling fan rotates, increasing the airflow speed across the surface of the air-cooled radiator 161 and improving heat dissipation efficiency. For example, the surface of the air-cooled radiator 161 is provided with multiple heat dissipation fins to increase the contact area with the outside air and further improve heat dissipation efficiency.

[0068] In some embodiments of the present invention, the heat dissipation device can be a cooling circuit, which is used for cooling and exchanges heat with the lubricating oil through the coolant in the circuit to cool the lubricating oil and accelerate the cooling speed of the lubricating oil.

[0069] Figure 2 This is a schematic diagram of another electric vehicle cooling system provided in an embodiment of the present invention, as shown below. Figure 2 As shown, in Figure 1 Based on the illustrated embodiment, the heat dissipation device may include a refrigeration circuit, which includes an air conditioning heat exchanger 162, a coolant pump 163, and an air conditioning refrigeration unit 164. The oil inlet of the air conditioning heat exchanger 162 is connected to the second oil outlet (3) of the three-way valve 140, and the oil outlet of the air conditioning heat exchanger 162 is connected to the oil inlet of the motor cooler 120. The liquid inlet of the air conditioning heat exchanger 162 is connected to the liquid outlet of the air conditioning refrigeration unit 164, and the liquid outlet of the air conditioning heat exchanger 162 is connected to the liquid inlet of the coolant pump 163. The liquid outlet of the coolant pump 163 is connected to the liquid inlet of the air conditioning refrigeration unit 164.

[0070] The air conditioning refrigeration unit 164 is used to cool the coolant in the cooling circuit. The cooled coolant is sent to the air conditioning heat exchanger 162 to exchange heat with the lubricating fluid, thereby cooling the lubricating fluid. After heat exchange, the coolant is pressurized by the coolant pump 163 and then flows back to the air conditioning refrigeration unit 164. The vehicle controller 110 is connected to both the air conditioning refrigeration unit 164 and the coolant pump 163 to control them.

[0071] In some embodiments of the present invention, to increase the heat dissipation efficiency of the heat dissipation device and accelerate the cooling rate of the lubricating oil, the heat dissipation device may include a heat exchanger, an electric water pump, an air-cooled radiator, and an expansion tank. The oil inlet of the heat exchanger is connected to the second oil outlet of a three-way valve, and the oil outlet of the heat exchanger is connected to the oil inlet of the motor cooler. The water outlet of the heat exchanger is connected to the water inlet of the electric water pump, the water outlet of the electric water pump is connected to the water inlet of the air-cooled radiator, and the water outlet of the air-cooled radiator is connected to the water inlet of the heat exchanger. The water inlet of the expansion tank is connected to the water outlet of the electric water pump, and the water outlet of the expansion tank is connected to the water inlet of the heat exchanger. Both the electric water pump and the air-cooled radiator are connected to the vehicle controller.

[0072] Figure 3 This is a schematic diagram of another electric vehicle cooling system provided in an embodiment of the present invention, as shown below. Figure 3 As shown, this embodiment is in Figure 1 Based on the illustrated embodiment, the heat dissipation device is further improved and may include a heat exchanger 165, an electric water pump 166, an air-cooled radiator 161, and an expansion tank 167. The oil inlet of the heat exchanger 165 is connected to the second oil outlet (3) of the three-way valve 140, and the oil outlet of the heat exchanger 165 is connected to the oil inlet of the motor cooler 120. The water outlet of the heat exchanger 165 is connected to the water inlet of the electric water pump 166, the water outlet of the electric water pump 166 is connected to the water inlet of the air-cooled radiator 161, and the water outlet of the air-cooled radiator 161 is connected to the water inlet of the heat exchanger 165. The water inlet of the expansion tank 167 is connected to the water outlet of the electric water pump 166, and the water outlet of the expansion tank 167 is connected to the water inlet of the heat exchanger 165. Both the electric water pump 166 and the air-cooled radiator 161 are connected to the vehicle controller 110. The vehicle controller 110 is used to control the operation of the electric water pump 166 and the air-cooled radiator 161, for example, rotation speed control, etc., which are not limited in this embodiment of the invention.

[0073] The high-temperature lubricating oil flowing from the second oil outlet (3) of the three-way valve 140 exchanges heat with water in the heat exchanger 165, thereby cooling the lubricating oil. After the heat exchange, the high-temperature water is sent to the air-cooled radiator by the electric water pump 166 for heat dissipation, and then flows back to the heat exchanger 165 to continue exchanging heat with the lubricating oil. The electric water pump 166 is used to pressurize the water in the pipeline and maintain the water circulation process. The expansion tank 167 and the expansion oil tank have similar functions, which stabilize the water pressure in the pipeline and replenish the water in the pipeline. In this embodiment, the lubricating oil is cooled by the heat exchanger, which increases the heat dissipation efficiency of the heat dissipation device and accelerates the cooling speed of the lubricating oil.

[0074] In some embodiments of the present invention, to further improve the heat dissipation efficiency of the cooling water in the water-cooling circuit and thus accelerate the cooling speed of the lubricating oil, the heat dissipation device further includes a water-cooled three-way valve, an air conditioning heat exchanger, a coolant pump, and an air conditioning refrigeration unit. The inlet of the water-cooled three-way valve is connected to the outlet of the electric water pump; the first outlet of the water-cooled three-way valve is connected to the inlet of the air-cooled radiator; the second outlet of the water-cooled three-way valve is connected to the inlet of the air conditioning heat exchanger; and the outlet of the air conditioning heat exchanger is connected to the inlet of the heat exchanger. The outlet of the air conditioning heat exchanger is connected to the inlet of the coolant pump; the outlet of the coolant pump is connected to the inlet of the air conditioning refrigeration unit; and the outlet of the air conditioning refrigeration unit is connected to the inlet of the air conditioning heat exchanger. The water-cooled three-way valve, the coolant pump, and the air conditioning refrigeration unit are all electrically connected to the vehicle controller.

[0075] Figure 4 This is a schematic diagram of another electric vehicle cooling system provided in an embodiment of the present invention, as shown below. Figure 4As shown, the embodiment in Figure 3 Based on the embodiment shown, the heat dissipation device further comprises a water-cooled three-way valve 168, an air-conditioning heat exchanger 162, a coolant pump 163 and an air-conditioning refrigeration device 164. The water inlet of the water-cooled three-way valve 168 is connected with the water outlet of the electric water pump 166, the first water outlet of the water-cooled three-way valve 168 is connected with the water inlet of the air-cooled radiator 161, the second water outlet of the water-cooled three-way valve 168 is connected with the water inlet of the air-conditioning heat exchanger 162, and the water outlet of the air-conditioning heat exchanger 162 is connected with the water inlet of the heat exchanger 165. The outlet of the air-conditioning heat exchanger 162 is connected with the inlet of the coolant pump 163, the outlet of the coolant pump 163 is connected with the inlet of the air-conditioning refrigeration device 164, and the outlet of the air-conditioning refrigeration device 164 is connected with the inlet of the air-conditioning heat exchanger 162. The water-cooled three-way valve 168, the coolant pump 163 and the air-conditioning refrigeration device 164 are all electrically connected with the vehicle controller 110.

[0076] In some embodiments of the present application, the electric vehicle cooling system in the above embodiment further comprises an oil temperature sensor and a speed sensor (not shown in the figure). The oil temperature sensor is used for the oil temperature in the oil injection pump, and the speed sensor is used for monitoring the speed of the output shaft of the speed reducer. For example, the oil temperature sensor is arranged inside the oil injection pump and is electrically connected with the vehicle controller. The speed sensor is arranged in the speed reducer, and the speed sensor is connected with the vehicle controller.

[0077] In the above embodiment, the electric vehicle is taken as an example to illustrate the present application, which is a double drive (i.e. the electric vehicle includes one drive motor). In other embodiments of the present application, the electric vehicle can also be a four-wheel drive (i.e. the electric vehicle includes two drive motors). In the following, the cooling system of the four-wheel drive electric vehicle will be illustrated.

[0078] The electric vehicle cooling system includes a first motor cooler, a second motor cooler, a first fuel injection pump, a second fuel injection pump, a first three-way valve, a second three-way valve, a first electric oil pump, and a second electric oil pump. The first and second motor coolers are used to cool the first and second motors of the electric vehicle, respectively. The oil outlet of the first motor cooler is connected to the oil inlet of the first fuel injection pump, and the oil outlet of the first fuel injection pump is connected to the oil inlet of the second three-way valve. The first fuel injection pump is used to inject oil into the gears of the first reducer connected to the first motor. The first oil outlet of the second three-way valve is connected to the oil inlet of the first electric oil pump, and the second oil outlet of the second three-way valve is connected to the oil inlet of the second electric oil pump. The oil outlet of the first electric oil pump is connected to the oil inlet of the first three-way valve, the first oil outlet of the first three-way valve is connected to the oil inlet of the first motor cooler, the second oil outlet of the first three-way valve is connected to the oil inlet of the cooling device, and the oil outlet of the cooling device is connected to the oil inlet of the first motor cooler. The outlet of the second electric oil pump is connected to the inlet of the second motor cooler. The outlet of the first motor cooler is connected to the inlet of the second fuel injection pump. The outlet of the second fuel injection pump is connected to the inlet of the first electric oil pump. The second fuel injection pump is used to inject oil into the gears of the second reducer connected to the second motor. The vehicle controller is electrically connected to the first fuel injection pump, the second fuel injection pump, the first three-way valve, the second three-way valve, the first electric oil pump, the second electric oil pump, and the cooling system.

[0079] Figure 5 This is a schematic diagram of another electric vehicle cooling system provided in an embodiment of the present invention, as shown below. Figure 5 As shown, this embodiment is in Figure 1 Based on the illustrated embodiment, the single-motor drive is changed to a dual-motor drive. For example, the electric vehicle cooling system includes a vehicle controller 110, a first motor cooler 121, a second motor cooler 122, a first fuel injection pump 131, a second fuel injection pump 132, a first three-way valve 141, a second three-way valve 142, a first electric oil pump 151, a second electric oil pump 152, and a heat dissipation device 160.

[0080] The first motor cooler 121 and the second motor cooler 122 are respectively used for cooling the first motor and the second motor of the electric vehicle. The oil outlet of the first motor cooler 121 is connected with the oil inlet of the first oil injection pump 131, the oil outlet of the first oil injection pump 131 is connected with the oil inlet (1) of the second three-way valve 142, the first oil injection pump 131 is used for spraying oil to the gear of the first reducer connected with the first motor. The first oil outlet (2) of the second three-way valve 142 is connected with the oil inlet of the first electric oil pump 151, the second oil outlet (3) of the second three-way valve 142 is connected with the oil inlet of the second electric oil pump 152. The oil outlet of the first electric oil pump 151 is connected with the oil inlet (1) of the first three-way valve 141, the first oil outlet (2) of the first three-way valve 141 is connected with the oil inlet of the first motor cooler 121, the second oil outlet (3) of the first three-way valve 141 is connected with the oil inlet of the heat dissipation device 160, and the oil outlet of the heat dissipation device 160 is connected with the oil inlet of the first motor cooler 121. The oil outlet of the second electric oil pump 152 is connected with the oil inlet of the second motor cooler 122, the oil outlet of the first motor cooler 121 is connected with the oil inlet of the second oil injection pump 132, the oil outlet of the second oil injection pump 132 is connected with the oil inlet of the first electric oil pump 151, and the second oil injection pump 132 is used for spraying oil to the gear of the second reducer connected with the second motor. The vehicle controller 110 is electrically connected with the first oil injection pump 131, the second oil injection pump 132, the first three-way valve 141, the second three-way valve 142, the first electric oil pump 151, the second electric oil pump 152 and the heat dissipation device 160 respectively.

[0081] For example, when the external environment temperature is lower than the preset temperature (for example, 35℃), and the oil temperature of the lubricating oil in the first oil injection pump 131 or the second oil injection pump 132 is lower than the first preset value (for example, 80℃), the vehicle controller 110 controls the oil inlet (1) and the first oil outlet (2) of the first three-way valve 141 to be connected, the oil inlet (1) and the second oil outlet (3) to be closed, the oil inlet (1) and the first oil outlet (2) of the second three-way valve 142 to be connected, the oil inlet (1) and the second oil outlet (3) to be closed, the circuit composed of the first electric oil pump 151, the first motor cooler 121 and the first oil injection pump 131 to be connected, the circuit in which the heat dissipation device 160 is located to be closed, and the circuit in which the second electric oil pump 152 and the second motor cooler 122 are located to be closed, so that the heat generated by the operation of the first motor can quickly heat the lubricating oil.

[0082] After the lubricating oil is heated, its temperature rises. When the oil temperature reaches a second preset value (e.g., 85°C), the vehicle controller 110 controls the oil inlet (1) and the oil outlet (3) of the first three-way valve 141 to connect, while the oil inlet (1) and the first oil outlet (2) are closed, connecting the circuit formed by the first electric oil pump 151, the cooling device 160, the first motor cooler 121, and the first fuel injection pump 131. Simultaneously, the vehicle controller 110 controls the oil inlet (1) and the oil outlet (3) of the second three-way valve 142 to connect, while the oil inlet (1) and the first oil outlet (2) are closed, connecting the circuit formed by the second electric oil pump 152, the cooling device 160, the second motor cooler 122, and the second fuel injection pump 132. The vehicle controller 110 controls the cooling device 160 to operate, cooling the lubricating oil in the pipeline.

[0083] Figure 6 This is a schematic diagram of another electric vehicle cooling system provided in an embodiment of the present invention, as shown below. Figure 6 As shown, similarly, for four-wheel drive electric vehicles, the cooling system may include, for example... Figure 2 The refrigeration circuit shown is used to accelerate the cooling of the lubricating oil inside the pipes. The refrigeration circuit in... Figure 2 The embodiments shown have been described in detail, and the embodiments of the present invention will not be repeated here.

[0084] Figure 7 This is a schematic diagram of another electric vehicle cooling system provided in an embodiment of the present invention, as shown below. Figure 7 As shown, similarly, for four-wheel drive electric vehicles, the cooling system may include, for example... Figure 3 The water-cooling circuit shown is used to accelerate the cooling of the lubricating oil inside the pipes. The water-cooling circuit... Figure 3 The embodiments shown have been described in detail, and the embodiments of the present invention will not be repeated here.

[0085] Figure 8 This is a schematic diagram of another electric vehicle cooling system provided in an embodiment of the present invention, as shown below. Figure 8 As shown, similarly, for four-wheel drive electric vehicles, the cooling system may include, for example... Figure 4 The water-cooling and refrigeration circuits shown are used to accelerate the cooling of the lubricating oil within the pipes. The water-cooling and refrigeration circuits are... Figure 4 The embodiments shown have been described in detail, and the embodiments of the present invention will not be repeated here.

[0086] This invention also provides a control method for an electric vehicle cooling system. Figure 9 A flowchart of a control method for an electric vehicle cooling system provided in an embodiment of the present invention is shown below. Figure 9 As shown, the method includes:

[0087] S101, when the oil temperature in the fuel injection pump is lower than a first preset value, the vehicle controller controls the three-way valve to connect the circuit formed by the electric oil pump, the motor cooler and the fuel injection pump.

[0088] For example, as shown in the embodiment, Figures 2-4 The oil temperature sensor is arranged in the fuel injection pump 130 to monitor the oil temperature in the fuel injection pump and feed back to the vehicle controller 110. When the oil temperature is lower than a first preset value (for example, 80℃), the vehicle controller 110 controls the three-way valve 140 to connect the inlet (1) and the first outlet (2) and shut off the inlet (1) and the second outlet (3), so as to connect the circuit formed by the electric oil pump 150, the motor cooler 120 and the fuel injection pump 130 and shut off the circuit in which the heat dissipating device 160 is arranged, so that the lubricating oil can be quickly heated by the heat generated by the operation of the motor.

[0089] For example, as shown in the embodiment, Figures 5-8 For example, as shown in the embodiment,

[0090] S102, when the heat generated by the operation of the motor of the electric vehicle makes the oil temperature rise to a second preset value, the vehicle controller controls the three-way valve to connect the circuit formed by the electric oil pump, the heat dissipating device, the motor cooler and the fuel injection pump.

[0091] After the lubricating oil is heated, the oil temperature rises. When the heat generated by the operation of the motor of the electric vehicle makes the oil temperature rise to a second preset value (for example, 85℃), the vehicle controller controls the three-way valve to connect the circuit formed by the electric oil pump, the heat dissipating device, the motor cooler and the fuel injection pump. Figures 1-4As shown, the vehicle controller 110 controls the oil inlet (1) and the second oil outlet (3) of the three-way valve 140 to connect, and the oil inlet (1) and the first oil outlet (2) to close, connecting the circuit consisting of the electric oil pump 150, the cooling device 160, the motor cooler 120, and the fuel injection pump 130. The vehicle controller 110 controls the cooling device 160 to work, cooling the lubricating oil in the pipeline. The cooled lubricating oil is sprayed onto the gears of the reducer through the nozzle of the fuel injection pump 130, providing the reducer with lubricating oil at a suitable temperature, avoiding the problem of excessively high lubricating oil temperature, which would cause the lubricating oil to deteriorate, affecting the lubrication effect of the reducer, and thus affecting the life of the reducer, thereby improving the service life of the lubricating oil and the reducer.

[0092] For four-wheel drive electric vehicles, when the heat generated by the electric motor causes the oil temperature to rise to a second preset value (e.g., 85°C), such as Figures 5-8 As shown, the vehicle controller 110 controls the oil inlet (1) and the second oil outlet (3) of the first three-way valve 141 to connect, and the oil inlet (1) and the first oil outlet (2) to close, connecting the circuit formed by the first electric oil pump 151, the cooling device 160, the first motor cooler 121, and the first fuel injection pump 131. Simultaneously, the vehicle controller 110 controls the oil inlet (1) and the second oil outlet (3) of the second three-way valve 142 to connect, and the oil inlet (1) and the first oil outlet (2) to close, connecting the circuit formed by the second electric oil pump 152, the cooling device 160, the second motor cooler 122, and the second fuel injection pump 132. The vehicle controller 110 controls the cooling device 160 to operate, cooling the lubricating oil in the pipeline.

[0093] In this embodiment of the invention, during the heating of lubricating oil (i.e., the circuit where the heat dissipation device is located is not connected), the rotational speed of the electric oil pump is inversely proportional to the oil temperature, and the load of the fuel injection pump is directly proportional to the rotational speed of the output shaft of the reducer.

[0094] During the process of cooling the lubricating oil (i.e., when the circuit containing the heat dissipation device is connected), the speed of the electric oil pump is directly proportional to the oil temperature, and the load of the fuel injection pump is directly proportional to the speed of the output shaft of the reducer.

[0095] For example, during the heating of lubricating oil, when the oil temperature in the injection pump is below a certain value T1_oil1 (e.g., -10℃), the electric oil pump operates at a high speed (80%–100% of its maximum speed); when the oil temperature is greater than or equal to -10℃ but less than 10℃, the electric oil pump operates at a medium speed (50%–80% of its maximum speed); when the oil temperature measured by the first oil temperature sensor is greater than or equal to 10℃, the electric oil pump operates at a low speed (30%–50% of its maximum speed). The lower the oil temperature, the faster the electric oil pump rotates, which accelerates the circulation of the lubricating oil at lower temperatures, thereby accelerating the temperature rise of the lubricating oil and allowing it to heat up quickly.

[0096] In the process of cooling the lubricating oil, when the oil temperature is greater than a first constant value (for example, 110 DEG C), the electric oil pump works at a high speed (80%~100% of the highest speed); when the oil temperature measured by the first oil temperature sensor is less than or equal to the first constant value (for example, 110 DEG C) and greater than a second constant value (for example, 100 DEG C), the electric oil pump works at a medium speed (50%~80% of the highest speed); when the oil temperature measured by the first oil temperature sensor is less than or equal to the second constant value (for example, 100 DEG C), the electric oil pump works at a low speed (30%~50% of the highest speed). The higher the oil temperature, the faster the speed of the electric oil pump, so that the circulation of the lubricating oil is accelerated in the case of high oil temperature, and the heat dissipation of the lubricating oil in the heat dissipation device is accelerated, so that the lubricating oil is rapidly cooled.

[0097] For example, when the speed of the output shaft of the speed reducer is 750 rpm, the load of the oil injection pump is 30%; when the speed of the output shaft of the speed reducer is 1000 rpm, the load of the oil injection pump is 40%; when the speed of the output shaft of the speed reducer is 1500 rpm, the load of the oil injection pump is 90%. The faster the speed of the output shaft of the speed reducer, the greater the load of the oil injection pump, and the greater the flow of the oil injection, thereby avoiding the problem that the gears of the speed reducer rotate too much and the lubricating oil cannot wet all the gears, and improving the transmission efficiency and service life of the gears.

[0098] The embodiment of the present application also provides an electric vehicle comprising the electric vehicle cooling system provided by any of the above-mentioned embodiments of the present application, which has the same effect as the above-mentioned electric vehicle cooling system.

[0099] In the description herein, it should be understood that the terms "upper", "lower", "left", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0100] In the description of the present specification, the description referring to the terms "an embodiment", "an example", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above-mentioned terms does not necessarily refer to the same embodiment or example.

[0101] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not necessarily contain only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0102] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only for explaining the principles of the present application, and cannot be interpreted as limiting the protection scope of the present application in any way. Based on the explanations herein, other specific embodiments of the present application can be conceived by those skilled in the art without any creative effort, and these embodiments will all fall within the protection scope of the present application.

Claims

1. An electric vehicle cooling system, characterized by, The cooling system comprises a vehicle controller, a motor cooler, an oil injection pump, a three-way valve, an electric oil pump and a heat dissipation device. An oil outlet of the motor cooler is connected with an oil inlet of the oil injection pump, an oil outlet of the oil injection pump is connected with an oil inlet of the electric oil pump, and the oil injection pump is used for spraying oil to gears of a reducer of the electric vehicle. An oil outlet of the electric oil pump is connected with an oil inlet of the three-way valve. A first oil outlet of the three-way valve is connected with an oil inlet of the motor cooler, a second oil outlet of the three-way valve is connected with an oil inlet of the heat dissipation device, and an oil outlet of the heat dissipation device is connected with an oil inlet of the motor cooler. The vehicle controller is electrically connected with the oil injection pump, the three-way valve, the electric oil pump and the heat dissipation device respectively. The electric vehicle cooling system further comprises an expansion oil tank, an oil inlet of the expansion oil tank is connected with an oil outlet of the electric oil pump, and an oil outlet of the expansion oil tank is connected with an oil inlet of the electric oil pump. The electric vehicle cooling system further comprises an oil temperature sensor and a rotating speed sensor. The oil temperature sensor is arranged in the oil injection pump and is electrically connected with the vehicle controller, and is used for detecting an oil temperature in the oil injection pump. The rotating speed sensor is connected with the vehicle controller and is used for detecting a rotating speed of an output shaft of the reducer. The heat dissipation device comprises a heat exchanger, an electric water pump, an air-cooled radiator and an expansion water tank. An oil inlet of the heat exchanger is connected with a second oil outlet of the three-way valve, and an oil outlet of the heat exchanger is connected with an oil inlet of the motor cooler. A water inlet of the electric water pump is connected with a water outlet of the heat exchanger, a water outlet of the electric water pump is connected with a water inlet of the air-cooled radiator, and a water outlet of the air-cooled radiator is connected with a water inlet of the heat exchanger. A water inlet of the expansion water tank is connected with a water outlet of the electric water pump, and a water outlet of the expansion water tank is connected with a water inlet of the heat exchanger. The electric water pump and the air-cooled radiator are connected with the vehicle controller. The heat dissipation device further comprises a water-cooled three-way valve, an air-conditioning heat exchanger, a cooling liquid pump and an air-conditioning refrigeration device. A water inlet of the water-cooled three-way valve is connected with a water outlet of the electric water pump, a first water outlet of the water-cooled three-way valve is connected with a water inlet of the air-cooled radiator, a second water outlet of the water-cooled three-way valve is connected with a water inlet of the air-conditioning heat exchanger, and a water outlet of the air-conditioning heat exchanger is connected with a water inlet of the heat exchanger. An outlet of the air-conditioning heat exchanger is connected with an inlet of the cooling liquid pump, an outlet of the cooling liquid pump is connected with an inlet of the air-conditioning refrigeration device, and an outlet of the air-conditioning refrigeration device is connected with an inlet of the air-conditioning heat exchanger. The water-cooled three-way valve, the cooling liquid pump and the air-conditioning refrigeration device are electrically connected with the vehicle controller.

2. The electric vehicle cooling system of claim 1, wherein, The heat dissipation device comprises an air-cooled radiator.

3. The electric vehicle cooling system of any of claims 1-2, wherein, The electric vehicle cooling system comprises a first motor cooler, a second motor cooler, a first oil injection pump, a second oil injection pump, a first three-way valve, a second three-way valve, a first electric oil pump and a second electric oil pump, the first motor cooler and the second motor cooler are respectively used for cooling and temperature reduction of first and second motors of the electric vehicle. The oil outlet of the first motor cooler is connected with the oil inlet of the first fuel injection pump, the oil outlet of the first fuel injection pump is connected with the oil inlet of the second three-way valve, and the first fuel injection pump is used to spray oil to the gear of the first speed reducer connected with the first motor; The first oil outlet of the second three-way valve is connected with the oil inlet of the first electric oil pump, and the second oil outlet of the second three-way valve is connected with the oil inlet of the second electric oil pump; The oil outlet of the first electric oil pump is connected with the oil inlet of the first three-way valve, the first oil outlet of the first three-way valve is connected with the oil inlet of the first motor cooler, the second oil outlet of the first three-way valve is connected with the oil inlet of the heat dissipation device, and the oil outlet of the heat dissipation device is connected with the oil inlet of the first motor cooler; The oil outlet of the second electric oil pump is connected with the oil inlet of the second motor cooler, the oil outlet of the first motor cooler is connected with the oil inlet of the second fuel injection pump, the oil outlet of the second fuel injection pump is connected with the oil inlet of the first electric oil pump, and the second fuel injection pump is used to spray oil to the gear of the second speed reducer connected with the second motor; The vehicle controller is electrically connected with the first fuel injection pump, the second fuel injection pump, the first three-way valve, the second three-way valve, the first electric oil pump, the second electric oil pump and the heat dissipation device.

4. An electric vehicle cooling system control method characterized by, The application is applied to the cooling system of the electric vehicle as claimed in any one of claims 1-3, and comprises: When the oil temperature in the fuel injection pump is lower than a first preset value, the vehicle controller controls the three-way valve to act, and the circuit formed by the electric oil pump, the motor cooler and the fuel injection pump is connected; When the heat generated by the motor operation of the electric vehicle makes the oil temperature rise to a second preset value, the vehicle controller controls the three-way valve to act, and the circuit formed by the electric oil pump, the heat dissipation device, the motor cooler and the fuel injection pump is connected.

5. The electric vehicle cooling system control method of claim 4, wherein In the process of heating the lubricating oil, the rotation speed of the electric oil pump is inversely proportional to the oil temperature, and the load of the fuel injection pump is proportional to the rotation speed of the output shaft of the speed reducer; In the process of cooling the lubricating oil, the rotation speed of the electric oil pump is proportional to the oil temperature, and the load of the fuel injection pump is proportional to the rotation speed of the output shaft of the speed reducer.

6. An electric vehicle, characterized by The application comprises the cooling system of the electric vehicle as claimed in any one of claims 1-3.

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