WO2023232013A1

WO2023232013A1 - Electric vehicle cooling system, control method and electric vehicle

Info

Publication number: WO2023232013A1
Application number: PCT/CN2023/097050
Authority: WO
Inventors: 赵慧超; 刘建康; 尹建坤; 霍云龙; 牛超凡; 胡志林; 刘力源; 车显达
Original assignee: 中国第一汽车股份有限公司
Priority date: 2022-05-30
Filing date: 2023-05-30
Publication date: 2023-12-07
Also published as: CN114857250A

Abstract

Provided are an electric vehicle cooling system, a control method and an electric vehicle. The electric vehicle cooling system comprises a vehicle controller (110), a motor cooler (120), a fuel injection pump (130), a three-way valve (140), an electric fuel pump (150) and a heat dissipation device (160). A fuel outlet of the motor cooler (120) is connected to a fuel inlet of the fuel injection pump (130), a fuel outlet of the fuel injection pump (130) is connected to a fuel inlet of the electric fuel pump (150), and the fuel injection pump (130) is configured to spray fuel to a gear of a speed reducer (190) of an electric vehicle. An fuel outlet of the electric fuel pump (150) is connected to a fuel inlet (1) of the three-way valve (140). A first fuel outlet (2) of the three-way valve (140) is connected to a fuel inlet of the motor cooler (120), a second fuel outlet (3) of the three-way valve (140) is connected to a fuel inlet of the heat dissipation device (160), and a fuel outlet of the heat dissipation device (160) is connected to the fuel inlet of the motor cooler (120). The vehicle controller (110) is separately electrically connected to the fuel injection pump (130), the three-way valve (140), the electric fuel pump (150), and the heat dissipation device (160).

Description

Electric vehicle cooling system, control method and electric vehicle

This application claims priority to the Chinese patent application with application number 202210598875.0, which was submitted to the China Patent Office on May 30, 2022. The entire content of this application is incorporated into this application by reference.

Technical field

This application relates to the technical field of electric vehicles, for example, to an electric vehicle cooling system, a control method and an electric vehicle.

Background technique

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 up a reducer, it is easy to increase the speed of the motor to obtain better acceleration performance in the high-speed section, thus avoiding the defect that the motor is difficult to increase the output torque at high speeds.

In order to achieve higher load and longer service life, lubricating oil is often used as the lubricating medium in the reducer. Lubricating oil has higher viscosity at low temperatures and poor lubrication performance. At the same time, because the viscosity is too high, it will also bring additional resistance to the reducer, thereby causing additional torque loss, which is intuitively manifested as a decrease in cruising range in electric vehicles.

Contents of the invention

This application provides an electric vehicle cooling system, a control method and an electric vehicle, which can use the heat generated by the operation of the motor to heat the lubricating oil, thereby improving energy efficiency and extending the cruising range of the electric vehicle.

This application provides an electric vehicle cooling system, including 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, and the fuel injection pump is configured to decelerate the electric vehicle. The gear of the machine is sprayed with oil;

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, and the second oil outlet of the three-way valve is connected to the oil inlet of the heat dissipation device. The oil outlet is connected to the oil inlet of the motor cooler;

The vehicle controller is electrically connected to the fuel injection pump, three-way valve, electric oil pump and heat dissipation device respectively.

In one or more embodiments, the electric vehicle cooling system further includes an expansion oil tank. The oil inlet of the expansion oil tank is connected to the oil outlet of the electric oil pump. The oil outlet of the expansion oil tank is connected to the electric oil pump. oil inlet connection.

In one or more embodiments, the heat dissipation device includes an air-cooled radiator.

In one or more embodiments, the heat dissipation device includes 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 the 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 exchanger. Heater water inlet connection;

The water inlet of the expansion water tank is connected to the water outlet of the electric water pump, and the water outlet of the expansion water tank is connected to the water inlet of the heat exchanger;

The electric water pump and the air-cooled radiator are both connected to the vehicle controller.

In one or more embodiments, the heat dissipation device also includes a water-cooled three-way valve, an air-conditioning heat exchanger, a coolant pump, and an air-conditioning and refrigeration equipment;

The water inlet of the water-cooled three-way valve is connected to the water outlet of the electric water pump, the first water outlet of the water-cooled three-way valve is connected to the water inlet of the air-cooled radiator, and the third water-cooled three-way valve The second water outlet is connected to the water inlet of the air-conditioning heat exchanger, and the water outlet of the air-conditioning heat exchanger is connected to the water 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 and refrigeration equipment, and the outlet of the air-conditioning and refrigeration equipment is connected to the inlet of the air-conditioning heat exchanger. import connection;

The water-cooled three-way valve, the coolant pump and the air conditioning and refrigeration equipment are all electrically connected to the vehicle controller.

In one or more embodiments, the electric vehicle cooling system further includes an oil temperature sensor and a rotational speed sensor;

The oil temperature sensor is arranged inside the fuel injection pump and is electrically connected to the vehicle controller, and is configured to detect the oil temperature in the fuel injection pump;

The rotation speed sensor is connected to the vehicle controller and configured to detect the rotation speed of the output shaft of the reducer.

In one or more embodiments, an electric vehicle cooling system includes a first motor cooler, a second motor cooler machine cooler, first fuel injection pump, second fuel injection pump, first three-way valve, second three-way valve, first electric oil pump and second electric oil pump, the first motor cooler and the second motor cooling The devices are respectively configured to cool the first motor and the second motor of the electric vehicle;

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 configured to inject oil to the gear 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. connect;

The oil outlet of the first electric oil pump is connected to the oil inlet of the first three-way valve, and 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 heat sink, and the oil outlet of the heat sink is connected to the oil inlet of the first motor cooler;

The oil outlet of the second electric oil pump is connected to the oil inlet of the second motor cooler, and the oil outlet of the second motor cooler is connected to the oil inlet of the second fuel injection pump. The oil outlet of the second fuel injection pump is connected to the oil inlet of the first electric oil pump, and the second fuel injection pump is configured to inject oil to the gear 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 heat dissipation device respectively.

This application also provides an electric vehicle cooling system control method, which is applied to the electric vehicle cooling system provided in the first aspect of this application, including:

When the oil temperature in the fuel injection pump is lower than the first preset value, the vehicle controller controls the action of the three-way valve to connect the circuit composed of the electric oil pump, motor cooler and fuel injection pump;

When the heat generated by the operation of the motor of the electric vehicle causes the oil temperature to rise to the second preset value, the vehicle controller controls the action of the three-way valve to connect the circuit composed of the electric oil pump, heat sink, motor cooler and fuel injection pump.

In one or more embodiments, during the process of heating 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 directly proportional to the rotation speed of the output shaft of the reducer. relation;

In the process of cooling the lubricating oil, the rotation 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 rotation speed of the output shaft of the reducer.

This application also provides an electric vehicle, including the electric vehicle cooling system provided by this application.

Description of the drawings

Figure 1 is a schematic structural diagram of an electric vehicle cooling system provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application;

Figure 3 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application;

Figure 5 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application;

Figure 6 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application;

Figure 7 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application;

Figure 8 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application;

Figure 9 is a flow chart of an electric vehicle cooling system control method provided by an embodiment of the present application;

Figure 10 is a schematic structural diagram of an electric vehicle provided by an embodiment of the present application.

Detailed ways

The technical solutions of the embodiments of the present application will be described below with reference to the accompanying drawings. The described embodiments are only some, not all, of the embodiments of the present application.

In the description of this application, unless otherwise specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components or an interaction between two components. The meanings of the above terms in this application can be understood according to the actual situation.

In this application, unless otherwise specified and limited, a first feature "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or it may include the first feature being in direct contact with the second feature. Not in direct contact but through additional characteristic contact between them. Furthermore, the terms "above", "above" and "above" a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature. In addition, the terms "first" and "second" are only used to differentiate in description and have no special meaning.

Embodiments of the present application provide an electric vehicle cooling system, including 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, and the oil outlet of the fuel injection pump is connected to the electric oil pump. The oil inlet is connected, and the fuel injection pump is set to inject oil to the gear of the reducer of the electric vehicle;

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 sink, and the oil outlet of the heat sink is connected to the oil inlet of the motor cooler. port connection;

The vehicle controller is electrically connected to the fuel injection pump, three-way valve, electric oil pump and cooling device respectively.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

Figure 1 is a schematic structural diagram of an electric vehicle cooling system provided by an embodiment of the present application. As shown in Figure 1, the system includes a vehicle controller 110, a motor cooler 120, a fuel injection pump 130, a three-way valve 140, and an electric oil pump. 150 and heat sink 160.

The oil outlet of the motor cooler 120 is connected to the oil inlet of the fuel injection pump 130. The oil outlet of the fuel injection pump 130 is connected to the oil inlet of the electric oil pump 150. The fuel injection pump 130 is configured to inject oil into the gear of the reducer 190 of the electric vehicle. Oil. The oil outlet of the electric oil pump 150 is connected to the oil inlet (1) of the three-way valve 140. The first oil outlet (2) of the three-way valve 140 is connected to the oil inlet of the motor cooler 120, and the second oil outlet (3) of the three-way valve 140 is connected to the oil inlet of the heat sink 160. The heat sink 160 The oil outlet is connected with the oil inlet of the motor cooler 120.

The vehicle controller 110 is electrically connected to the fuel injection pump 130, the three-way valve 140, the electric oil pump 150 and the heat sink 160 respectively, and is configured to control the operation of the fuel injection pump 130, the three-way valve 140, the electric oil pump 150 and the heat sink 160.

The motor cooler 120 is configured to cool the drive motor (M in the figure) of the electric vehicle. For example, in the embodiment of the present application, the motor cooler 120 may include a plurality of pipes for transmitting lubricating oil, which are arranged on the casing of the drive motor or wrapped around the stator of the drive motor, and the operation process of the drive motor is controlled through heat exchange. The heat generated in the motor is transferred to the lubricating oil in the motor cooler, thereby heating the lubricating oil. In the industry, water cooling solutions are usually used to cool down the drive motor. The cooling water flows through the motor to form a separate cooling circuit. The cost is high, and the heat generated by the drive motor cannot be effectively utilized, resulting in low energy efficiency. In the embodiment of the present application, the heat generated by the drive motor is used to heat the lubricating oil of the reducer, effectively utilizing the heat generated during the operation of the drive motor and improving energy efficiency.

The fuel injection pump 130 is provided with a nozzle, and the heated lubricating oil is sprayed to the gear of the reducer 190 through the nozzle of the fuel injection pump 130 to provide the reducer 190 with lubricating oil at a suitable temperature to prevent the temperature from being too low and increasing the viscosity of the lubricating oil, which may cause electric vehicles The problem of reduced cruising range has improved the cruising range of electric vehicles. For example, the flow rate of the lubricating oil sprayed from the nozzle of the fuel injection pump 130 can be controlled by the vehicle controller 110. For example, the whole vehicle controller 110 controls the flow rate of the lubricating oil sprayed from the nozzle of the fuel injection pump 130 through pulse width modulation. At present, the lubrication of reducers in the industry usually uses splash lubrication, that is, the reducer Part of the gears are soaked in lubricating oil for cooling. At the same time, the oil is stirred when the gears of the reducer rotate. The oil splashes to lubricate and cool the gears of the reducer. The gears of the reducer have greater resistance when the oil is stirred in the lubricating oil, and the transmission efficiency is low. The embodiment of the present application injects oil into the gear of the reducer through a fuel injection pump, thereby reducing the resistance of the gear rotation, improving the transmission efficiency, and thereby increasing the cruising range of the electric vehicle.

The heat dissipation device 160 is set to cool down the lubricating oil when the oil temperature is too high, so as to avoid the problem that the lubricating oil temperature is too high, causing the lubricating oil to deteriorate, affecting the lubrication effect of the reducer, thereby affecting the life of the reducer, and improving the quality of the lubricating oil and the reducer. service life. The heat dissipation form of the heat dissipation device 160 may be air-cooling heat dissipation, water-cooling heat dissipation or a combination of heat dissipation methods, which are not limited in the embodiments of the present application.

For example, when the external environment temperature is lower than the preset temperature (for example, 35°C), and the oil temperature of the lubricating oil in the fuel injection pump 130 is lower than the first preset value (for example, 80°C), the vehicle controller 110 controls the oil inlet (1) of the three-way valve 140 to be connected to the first oil outlet (2), the oil inlet (1) and the second oil outlet (3) to be closed, and connected to the electric oil pump 150 and the motor cooler. 120 and the fuel injection pump 130, the circuit where the heat dissipation device 160 is located is turned off so that the lubricating oil can be quickly heated by the heat generated by the operation of the motor. The heat generated by the operation of the driving motor heats the lubricating oil in the motor cooler 120 . The heated lubricating oil is sprayed to the gear of the reducer 190 through the nozzle of the oil injection pump 130 to provide the reducer 190 with lubricating oil of appropriate temperature. The lubricating oil flows back to the electric oil pump 150 through the outlet of the fuel injection pump 130. The electric oil pump 150 pressurizes the lubricating oil to ensure that the lubricating oil in the pipeline has sufficient pressure so that the lubricating oil can flow through multiple locations in the system.

After the lubricating oil is heated, the oil temperature rises. When the oil temperature reaches the second preset value (for example, 85°C), the vehicle controller 110 controls the oil inlet (1) and the second oil outlet of the three-way valve 140 (3) Connect, the oil inlet (1) and the first oil outlet (2) are closed, and the circuit composed of the electric oil pump 150, the heat sink 160, the motor cooler 120 and the fuel injection pump 130 is connected. The vehicle controller 110 controls the operation of the heat dissipation device 160 to cool down the lubricating oil in the pipeline. The cooled lubricating oil is sprayed to the gear of the reducer 190 through the nozzle of the oil injection pump 130 to provide the reducer with lubricating oil at a suitable temperature to avoid excessive temperature of the lubricating oil, which may cause deterioration of the lubricating oil and affect the lubrication effect of the reducer, thereby affecting deceleration. The problem of reducer life is improved, and the service life of lubricating oil and reducer is improved.

The electric vehicle cooling system provided by the embodiment of the present application includes a vehicle controller 110, a motor cooler 120, a fuel injection pump 130, a three-way valve 140, an electric oil pump 150 and a heat dissipation device 160. The oil outlet of the motor cooler 120 and the injection port are The oil inlet of the oil pump 130 is connected, and the oil outlet of the fuel injection pump 130 is connected with the oil inlet of the electric oil pump 150. The oil injection pump 130 is configured to inject oil to the gear of the reducer 190 of the electric vehicle. The oil outlet of the electric oil pump 150 is connected to the oil inlet of the electric vehicle. The oil inlet (1) of the three-way valve 140 is connected, the first oil outlet (2) of the three-way valve 140 is connected with the oil inlet of the motor cooler 120, and the second oil outlet (3) of the three-way valve 140 It 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. The whole vehicle The controller 110 is electrically connected to the fuel injection pump 130, the three-way valve 140, the electric oil pump 150 and the heat sink 160 respectively. In the embodiment of the present application, the heat generated by the drive motor is used to heat the lubricating oil of the reducer 190, effectively utilizing the heat generated during the operation of the drive motor and improving energy efficiency; the heated lubricating oil is sprayed to the reducer through the nozzle of the fuel injection pump 130. gears to avoid the problem of lowering the cruising range of electric vehicles caused by excessively low temperatures and increased viscosity of lubricating oil, and improves the cruising range of electric vehicles. When the lubricating oil temperature is too high, the vehicle controller 110 controls the three-way valve 140 to connect to the circuit where the heat dissipation device 160 is located to cool down the lubricating oil to prevent the lubricating oil temperature from being too high, causing the lubricating oil to deteriorate and affecting the lubrication effect of the reducer. , which in turn affects the life of the reducer and improves the service life of the lubricating oil and reducer.

In some embodiments of the present application, the electric vehicle cooling system further includes an expansion oil tank, the oil inlet of the expansion oil tank is connected to the oil outlet of the electric oil pump, and the oil outlet of the expansion oil tank is connected to the oil inlet of the electric oil pump. Exemplarily, as shown in Figure 1, the electric vehicle cooling system also includes an expansion oil tank 170. The oil inlet of the expansion oil tank 170 is connected to the oil outlet of the electric oil pump 150. The oil outlet of the expansion oil tank 170 is connected to the inlet of the electric oil pump 150. Oil port connection. The expansion oil tank 170 is usually not filled with lubricating oil and can function as a pressure stabilizer. 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 a change in pressure. The expansion oil tank 170 provides sufficient volume expansion or contraction space for the lubricating oil. It avoids the problem of pipeline damage caused by too high or too low pressure in the pipeline, and improves the stability of the electric vehicle cooling system. The expansion oil tank 170 can also play the role of replenishing oil. When the loss of lubricating oil in the pipeline decreases, the expansion oil tank 170 can replenish lubricating oil in the pipeline in time.

In some embodiments of the present application, the heat dissipation device may include an air-cooled radiator. For example, as shown in FIG. 1 , the heat dissipation device 160 includes an air-cooling radiator 161 , and the air-cooling radiator 161 includes a cooling fan. The lubricating oil in the pipe exchanges heat with the air-cooled radiator 161 and transfers the heat to the surface of the air-cooled radiator 161 . The cooling fan rotates to accelerate the air flow speed on the surface of the air-cooled radiator 161 and improve the heat dissipation efficiency. For example, a plurality of heat dissipation fins are provided on the surface of the air-cooled radiator 161 to increase the contact area with outside air and improve heat dissipation efficiency.

In some embodiments of the present application, the heat dissipation device 160 may include a refrigeration circuit. The refrigeration circuit is configured to cool down the lubricating oil through heat exchange between the coolant in the circuit and the lubricating oil, thereby accelerating the cooling rate of the lubricating oil.

Figure 2 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application. As shown in Figure 2, based on the embodiment shown in Figure 1, the heat dissipation device can include a refrigeration circuit, and the refrigeration circuit includes an air conditioner. Heater 162, coolant pump 163 and air conditioning and refrigeration equipment 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 and refrigeration equipment 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 with the liquid inlet of the air conditioning and refrigeration equipment 164 .

The air-conditioning and refrigeration equipment 164 is configured to cool the cooling liquid in the cooling circuit, and the cooled liquid is sent to the air-conditioning heat exchanger 162 for heat exchange with the lubricating liquid to achieve cooling of the lubricating liquid. The heat-exchanged coolant is pressurized by the coolant pump 163 and then flows back to the air conditioning and refrigeration equipment 164 . Among them, the vehicle controller 110 is connected to the air conditioning and refrigeration equipment 164 and the coolant pump 163 respectively to realize the control of the air conditioning and refrigeration equipment 164 and the coolant pump 163.

In some embodiments of the present application, in order to increase the heat dissipation efficiency of the heat dissipation device and speed up the cooling speed 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 the 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 water tank is connected to the water outlet of the electric water pump, and the water outlet of the expansion water tank is connected to the water inlet of the heat exchanger. The electric water pump and air-cooled radiator are connected to the vehicle controller.

Figure 3 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application. As shown in Figure 3, this embodiment explains the heat dissipation device based on the embodiment shown in Figure 1. The heat dissipation device 160 It 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 water tank 167 is connected to the water outlet of the electric water pump 166 , and the water outlet of the expansion water tank 167 is connected to the water inlet of the heat exchanger 165 . The electric water pump 166 and the air-cooled radiator 161 are both connected to the vehicle controller 110 . The vehicle controller 110 is configured to control the operation of the electric water pump 166 and the air-cooled radiator 161, for example, rotation rate control, etc. The embodiment of the present application is not limited here.

The high-temperature lubricating oil flowing out of the second oil outlet (3) of the three-way valve 140 exchanges heat with water in the heat exchanger 165 to achieve cooling of the lubricating oil. After heat exchange, the high-temperature water is sent to the air-cooled radiator 161 for heat dissipation through the electric water pump 166, and returns to the heat exchanger 165 after heat dissipation to continue heat exchange with the lubricating oil. The electric water pump 166 is configured to pressurize the water in the pipeline to maintain the water circulation process. The expansion water tank 167 has a similar function to the expansion oil tank, and plays the role of stabilizing the water pressure in the pipeline and replenishing the water in the pipeline. In this embodiment, the heat exchanger 165 is used to cool down the lubricating oil, thereby increasing the heat dissipation efficiency of the heat dissipation device and accelerating the cooling speed of the lubricating oil.

In some embodiments of the present application, in order to improve the heat dissipation efficiency of the cooling water in the water cooling circuit and thereby speed up the cooling speed of the lubricating oil, the heat dissipation device also includes a water-cooling three-way valve, an air-conditioning heat exchanger, a coolant pump, and an air-conditioning and refrigeration equipment. The water inlet of the water-cooled three-way valve is connected to the water outlet of the electric water pump, the first water outlet of the water-cooled three-way valve is connected to the water inlet of the air-cooled radiator, and the second water outlet of the water-cooled three-way valve is connected to the air conditioner. The water inlet of the heat exchanger is connected, and the water outlet of the air conditioner heat exchanger is connected with the water 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 and refrigeration equipment, and the outlet of the air-conditioning and refrigeration equipment is connected to the inlet of the air-conditioning heat exchanger. The water-cooled three-way valve, coolant pump and air conditioning and refrigeration equipment are all electrically connected to the vehicle controller.

Figure 4 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application. As shown in Figure 4, this embodiment is based on the embodiment shown in Figure 3. The heat dissipation device also includes a water-cooled three-way valve 168. , air conditioning heat exchanger 162, coolant pump 163 and air conditioning refrigeration equipment 164. The water inlet (1) of the water-cooled three-way valve 168 is connected to the water outlet of the electric water pump 166. The first water outlet (2) of the water-cooled three-way valve 168 is connected to the water inlet of the air-cooled radiator 161. The second water outlet (3) is connected to the water inlet of the air conditioning heat exchanger 162, and the water outlet of the air conditioning heat exchanger 162 is connected to the water inlet of the heat exchanger 165. The outlet of the air conditioning heat exchanger 162 is connected to the inlet of the coolant pump 163 , the outlet of the coolant pump 163 is connected to the inlet of the air conditioning and refrigeration equipment 164 , and the outlet of the air conditioning and refrigeration equipment 164 is connected to the inlet of the air conditioning heat exchanger 162 . The water-cooling three-way valve 168, the coolant pump 163 and the air conditioning and refrigeration equipment 164 are all electrically connected to the vehicle controller 110.

In some embodiments of the present application, the electric vehicle cooling system in the above embodiments further includes an oil temperature sensor 133 and a rotational speed sensor 180 . The oil temperature sensor 133 is configured to detect the oil temperature in the fuel injection pump 130 , and the rotation speed sensor 180 is configured to monitor the rotation speed of the output shaft of the reducer 190 . For example, the oil temperature sensor 133 is disposed inside the fuel injection pump 130 and is electrically connected to the vehicle controller 110 . The rotation speed sensor 180 is installed in the reducer 190 , and the rotation speed sensor 180 is connected to the vehicle controller 110 .

In the above embodiment, the electric vehicle is a dual-wheel drive (that is, the electric vehicle includes a drive motor) as an example to illustrate the present application. In other embodiments of the present application, the electric vehicle may also be a four-wheel drive (that is, the electric vehicle includes a drive motor). two drive motors). Below, an exemplary description will be given of the cooling system of a four-wheel drive electric vehicle.

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. A motor cooler and a second motor cooler are respectively configured to cool the first motor and the second motor of the electric vehicle. The oil outlet of the first motor cooler is connected to the oil inlet of the first fuel injection pump. 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 configured to connect to the first fuel injection pump. The gear of the first reducer connected to the motor is sprayed with oil. 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, and 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 is connected to the oil inlet of the heat sink, and the oil outlet of the heat sink is connected to the oil inlet of the first motor cooler. The oil outlet of the second electric oil pump is connected to the oil inlet of the second motor cooler. The oil outlet of the first motor cooler is connected to the oil inlet of the second fuel injection pump. The oil outlet of the second fuel injection pump is connected to the oil inlet of the first electric oil pump, and the second fuel injection pump is configured to inject oil to the gear 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 heat sink respectively.

Figure 5 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application. As shown in Figure 5, this embodiment is based on the embodiment shown in Figure 1, and changes the single motor drive to a dual motor drive. . Exemplarily, 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, first electric oil pump 151, second electric oil pump 152 and heat sink 160.

The first motor cooler 121 and the second motor cooler 122 are respectively configured to cool the first motor and the second motor of the electric vehicle. The oil outlet of the first motor cooler 121 is connected to the oil inlet of the first fuel injection pump 131 , and the oil outlet of the first fuel injection pump 131 is connected to the oil inlet (1) of the second three-way valve 142 . The oil pump 131 is configured to inject oil to the gear of the first reducer connected to the first motor. The first oil outlet (2) of the second three-way valve 142 is connected to the oil inlet of the first electric oil pump 151, and the second oil outlet (3) of the second three-way valve 142 is connected to the inlet of the second electric oil pump 152. Oil port connection. The oil outlet of the first electric oil pump 151 is connected to the oil inlet (1) of the first three-way valve 141, and the first oil outlet (2) of the first three-way valve 141 is connected to 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 sink 160, and the oil outlet of the heat sink 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 to the oil inlet of the second motor cooler 122 . The oil outlet of the second motor cooler 122 is connected to the oil inlet of the second fuel injection pump 132 . The oil outlet is connected to the oil inlet of the first electric oil pump 151, and the second fuel injection pump 132 is configured to inject oil to the gear of the second reducer connected to the second motor. The vehicle controller 110 is electrically connected to the first fuel injection pump 131, the second fuel 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 sink 160 respectively. .

For example, when the external environment temperature is lower than the preset temperature (for example, 35°C), and the oil temperature of the lubricating oil in the first fuel injection pump 131 or the second fuel injection pump 132 is lower than the first preset value (for example, 80°C) ℃), the vehicle controller 110 controls the oil inlet (1) of the first three-way valve 141 to connect with the first oil outlet (2), and the oil inlet (1) and the second oil outlet (3) are closed. off, the oil inlet (1) of the second three-way valve 142 is connected to the first oil outlet (2), the oil inlet (1) and the second oil outlet (3) are closed, and connected to the first electric oil pump 151 , the circuit formed by the first motor cooler 121 and the first fuel injection pump 131, the circuit where the heat dissipation device 160 is located is closed, and the circuit where the second electric oil pump 152 and the second motor cooler 122 are located is closed, so that the first motor can pass The heat generated by operation rapidly heats the lubricating oil.

After the lubricating oil is heated, the oil temperature rises. When the oil temperature reaches the second preset value (for example, 85°C), the vehicle controller 110 controls the oil inlet (1) and the second outlet of the first three-way valve 141. Oil port (3) is connected, The oil inlet (1) and the first oil outlet (2) are closed and connected to a circuit formed by the first electric oil pump 151, the heat sink 160, the first motor cooler 121 and the first fuel injection pump 131. At the same time, the vehicle controller 110 controls the oil inlet (1) and the second oil outlet (3) of the second three-way valve 142 to be connected, and the oil inlet (1) and the first oil outlet (2) are closed. The circuit formed by the second electric oil pump 152, the heat sink 160, the second motor cooler 122 and the second fuel injection pump 132 is connected. The vehicle controller 110 controls the operation of the heat dissipation device 160 to cool down the lubricating oil in the pipeline.

Figure 6 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application. As shown in Figure 6, similarly, for a four-wheel drive electric vehicle, the heat dissipation device can include a refrigeration circuit as shown in Figure 2. In order to speed up the heat dissipation of the lubricating oil in the cooling pipe. The refrigeration circuit has been described in the embodiment shown in FIG. 2 and will not be described again in the embodiment of the present application.

Figure 7 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application. As shown in Figure 7, similarly, for a four-wheel drive electric vehicle, the heat dissipation device can include a water cooling circuit as shown in Figure 3. To speed up the cooling of the lubricating oil in the pipe. The water cooling circuit has been described in the embodiment shown in FIG. 3 and will not be described again in the embodiment of the present application.

FIG. 8 is a schematic structural diagram of another electric vehicle cooling system provided by an embodiment of the present application. As shown in FIG. 8 , similarly, for a four-wheel drive electric vehicle, the heat dissipation device may include a water cooling circuit and a refrigeration system as shown in FIG. 4 circuit, set up to accelerate the cooling of the lubricating oil in the pipe. The water cooling circuit and the refrigeration circuit have been described in the embodiment shown in Figure 4, and will not be described again in the embodiment of the present application.

The embodiment of the present application also provides a method for controlling the cooling system of an electric vehicle. Figure 9 is a flow chart of a method of controlling the cooling system of an electric vehicle provided by the embodiment of the present application. As shown in Figure 9, the method includes the following steps.

S101. When the oil temperature in the fuel injection pump is lower than the first preset value, the vehicle controller controls the action of the three-way valve to connect the circuit composed of the electric oil pump, motor cooler and fuel injection pump.

Illustratively, taking the embodiment shown in FIGS. 2-4 as an example, the fuel injection pump 130 is provided with an oil temperature sensor, which is configured to monitor the oil temperature in the fuel injection pump 130 and transmit the oil temperature back to the vehicle controller. 110. When the oil temperature is lower than the first preset value (for example, 80°C), the vehicle controller 110 controls the oil inlet (1) of the three-way valve 140 to communicate with the first oil outlet (2). (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 connected. The circuit where the heat dissipation device 160 is located is closed so that the heat generated by the operation of the motor can be quickly passed through. Heat the lubricating oil.

For a four-wheel drive electric vehicle, as shown in Figures 5-8, when the oil temperature of the lubricating oil in the first fuel injection pump 131 or the second fuel injection pump 132 is lower than the first preset value (for example, 80°C), 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) are closed, and the second oil outlet (3) is closed. The oil inlet (1) of the three-way valve 142 is connected with the first oil outlet (2), and the oil inlet The port (1) and the second oil outlet (3) are closed, connecting the circuit composed of the first electric oil pump 151, the first motor cooler 121 and the first fuel injection pump 131, the circuit where the heat dissipation device 160 is located is closed, and the second The circuit where the electric oil pump 152 and the second motor cooler 122 are located is shut off so that the lubricating oil can be quickly heated by the heat generated by the operation of the first motor.

S102. When the heat generated by the operation of the motor of the electric vehicle causes the oil temperature to rise to the second preset value, the vehicle controller controls the action of the three-way valve to connect the circuit composed of the electric oil pump, the heat sink, the motor cooler and the fuel injection pump.

After the lubricating oil is heated, the oil temperature rises. 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 (for example, 85°C), as shown in Figures 1 to 4, the entire vehicle The controller 110 controls the oil inlet (1) and the second oil outlet (3) of the three-way valve 140 to be connected, the oil inlet (1) and the first oil outlet (2) are closed, and connected to the electric oil pump 150 and heat dissipation. The circuit composed of device 160, motor cooler 120 and fuel injection pump 130. The vehicle controller 110 controls the operation of the heat dissipation device 160 to cool down the lubricating oil in the pipeline. The cooled lubricating oil is sprayed to the gear of the reducer through the nozzle of the oil injection pump 130 to provide the reducer with lubricating oil at a suitable temperature to avoid excessive temperature of the lubricating oil, which may cause deterioration of the lubricating oil and affect the lubrication effect of the reducer, thereby affecting the reducer. The problem of life is to improve the service life of lubricating oil and reducer.

For a four-wheel drive electric vehicle, when the heat generated by the motor operation of the electric vehicle causes the oil temperature to rise to a second preset value (for example, 85°C), as shown in Figures 5 to 8, the vehicle controller 110 The oil inlet (1) and the second oil outlet (3) of the first three-way valve 141 are controlled to be connected, the oil inlet (1) and the first oil outlet (2) are closed, and the first electric oil pump 151 and The heat sink 160, the first motor cooler 121 and the first fuel injection pump 131 form a circuit. At the same time, the vehicle controller 110 controls the oil inlet (1) and the second oil outlet (3) of the second three-way valve 142 to be connected, and the oil inlet (1) and the first oil outlet (2) are closed. The circuit formed by the second electric oil pump 152, the heat sink 160, the second motor cooler 122 and the second fuel injection pump 132 is connected. The vehicle controller 110 controls the operation of the heat dissipation device 160 to cool down the lubricating oil in the pipeline.

In the embodiment of the present application, during the process of heating the lubricating oil (that is, the circuit where the heat dissipation device is located is not connected), the rotation 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 rotation speed of the output shaft of the reducer. relation.

In the process of cooling the lubricating oil (that is, the circuit where the heat dissipation device is located 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.

For example, in the process of heating lubricating oil, when the oil temperature in the fuel injection pump is less than a certain value T1_oil1 (for example -10°C), the electric oil pump works at a high speed (80% to 100% of the maximum speed); when the oil temperature If the temperature is greater than or equal to a certain value (-10℃) and less than another value (10℃), the electric oil pump will work at medium speed (50% to 80% of the maximum speed); when the oil temperature measured by the first oil temperature sensor If it is greater than or equal to a certain value (10°C), the electric oil pump will work at a low speed (30% to 50% of the maximum speed). The lower the oil temperature, the faster the electric oil pump rotates, which speeds up the circulation of lubricating oil when the oil temperature is low, thereby speeding up The heating rate of the lubricating oil causes the lubricating oil to heat up quickly.

In the process of cooling the lubricating oil, when the oil temperature is greater than a first certain value (for example, 110°C), the electric oil pump works at a high speed (80% to 100% of the maximum speed); when the first oil temperature sensor measures If the oil temperature is less than or equal to the first fixed value (for example, 110°C) and greater than the second fixed value (for example, 100°C), the electric oil pump works at a medium speed (50% to 80% of the maximum speed); when the first oil temperature sensor If the measured oil temperature is less than or equal to the second fixed value (for example, 100°C), the electric oil pump operates at a low speed (30% to 50% of the maximum speed). The higher the oil temperature, the faster the electric oil pump rotates, which accelerates the circulation of lubricating oil when the oil temperature is high, thereby accelerating the heat dissipation of the lubricating oil in the heat dissipation device, causing the lubricating oil to cool down quickly.

For example, when the speed of the output shaft of the reducer is 750 revolutions per minute (rpm), the fuel injection pump load is 30%; when the speed of the reducer output shaft is 1000 rpm, the fuel injection pump load is 40%; When the speed of the reducer output shaft is 1500rpm, the fuel injection pump load is 90%. The faster the speed of the output shaft of the reducer, the greater the load of the fuel injection pump and the greater the flow of oil injection, thus avoiding the problem that the gears of the reducer rotate too much and the lubricating oil cannot wet all the gears, improving the transmission efficiency of the gears and service life.

An embodiment of the present application also provides an electric vehicle, including an electric vehicle cooling system as provided in any of the above embodiments of the application, and having the same effect as the above-mentioned electric vehicle cooling system. Figure 10 is a schematic structural diagram of an electric vehicle provided by an embodiment of the present application. The electric vehicle includes the electric vehicle cooling system 100 provided in any of the above embodiments, and also includes a motor 200 connected to the electric vehicle cooling system 100 .

In the description of this article, the terms "upper", "lower", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings. They are only for convenience of description and simplified operation, and are not Any indication or implication that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation shall not be construed as a limitation on the present application.

In the description of this specification, reference to the terms "an embodiment," "example," etc., means that a feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

In addition, although this specification is described in terms of implementations, not each implementation only contains an independent technical solution. This description is only for the sake of clarity. The description should be taken as a whole. The technical solutions can also be appropriately combined to form other understandable embodiments.

Claims

An electric vehicle cooling system, including 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, and the fuel injection pump is configured to decelerate the electric vehicle. The gear of the machine is sprayed with oil;

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, and the second oil outlet of the three-way valve is connected to the oil inlet of the heat dissipation device. The oil outlet 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 electric vehicle cooling system according to claim 1, further comprising an expansion oil tank, the oil inlet of the expansion oil tank is connected to the oil outlet of the electric oil pump, and the oil outlet of the expansion oil tank is connected to the oil outlet of the electric oil pump. Oil inlet connection.
The electric vehicle cooling system according to claim 1, wherein the heat dissipation device includes an air-cooled radiator.
The electric vehicle cooling system according to claim 1, wherein the heat dissipation device includes 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 the 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 exchanger. Heater water inlet connection;

The water inlet of the expansion water tank is connected to the water outlet of the electric water pump, and the water outlet of the expansion water tank is connected to the water inlet of the heat exchanger;

The electric water pump and the air-cooled radiator are both connected to the vehicle controller.
The electric vehicle cooling system according to claim 4, wherein 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 equipment;

The water inlet of the water-cooled three-way valve is connected to the water outlet of the electric water pump, the first water outlet of the water-cooled three-way valve is connected to the water inlet of the air-cooled radiator, and the third water-cooled three-way valve The second water outlet is connected to the water inlet of the air-conditioning heat exchanger, and the water outlet of the air-conditioning heat exchanger is connected to the water 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 and refrigeration equipment, and the outlet of the air-conditioning and refrigeration equipment is connected to the inlet of the air-conditioning heat exchanger. import connection;

The water-cooled three-way valve, the coolant pump and the air conditioning and refrigeration equipment are all electrically connected to the vehicle controller.
The electric vehicle cooling system according to claim 1, further comprising an oil temperature sensor and a rotational speed sensor;

The oil temperature sensor is arranged inside the fuel injection pump and is electrically connected to the vehicle controller, and is configured to detect the oil temperature in the fuel injection pump;

The rotation speed sensor is connected to the vehicle controller and configured to detect the rotation speed of the output shaft of the reducer.
The electric vehicle cooling system according to any one of claims 1 to 6, wherein 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 a one-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 configured to be the first motor and the second motor of the electric vehicle. cooling down;

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 configured to inject oil to the gear 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. connect;

The oil outlet of the first electric oil pump is connected to the oil inlet of the first three-way valve, and 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 heat sink, and the oil outlet of the heat sink is connected to the oil inlet of the first motor cooler;

The oil outlet of the second electric oil pump is connected to the oil inlet of the second motor cooler, and the oil outlet of the second motor cooler is connected to the oil inlet of the second fuel injection pump. The oil outlet of the second fuel injection pump is connected to the oil inlet of the first electric oil pump, and the second fuel injection pump is configured to inject oil to the gear of the second reducer connected to the second motor;

The vehicle controller and 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 electrically connected to the heat dissipation device respectively.
An electric vehicle cooling system control method, applied to the electric vehicle cooling system according to any one of claims 1-7, including:

When the oil temperature in the fuel injection pump is lower than the first preset value, the vehicle controller controls the action of the three-way valve to connect the circuit composed of the electric oil pump, the motor cooler and the fuel injection pump;

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 action of the three-way valve to connect the electric oil pump, the heat dissipation device, and the The circuit formed by the motor cooler and the fuel injection pump.
The electric vehicle cooling system control method according to claim 8, wherein during the process of heating 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 inversely proportional to the output of the reducer. The rotation speed of the shaft is proportional to the relationship;

In the process of cooling the lubricating oil, the rotation 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 rotation speed of the output shaft of the reducer.
An electric vehicle includes the electric vehicle cooling system as claimed in any one of claims 1 to 7 and a motor connected to the electric vehicle cooling system.