Cooling control method and cooling control device of vehicle and vehicle

Abstract

The invention provides a cooling control method and device of a vehicle and the vehicle. The vehicle comprises a transmission system and a cooling system used for cooling the transmission system. The cooling system comprises a cooling loop in which a cooling medium flows. The control method comprises the steps that a temperature parameter used for representing the temperature of a transmission system and / or a cooling medium in the vehicle and an atmospheric pressure parameter used for representing the atmospheric pressure in the environment where the vehicle is located are obtained; and controlling the flow of the cooling medium in the cooling loop according to the temperature parameter and the atmospheric pressure parameter. Therefore, the flow of the cooling medium in the cooling loop can be adjusted according to the change of the atmospheric pressure in the environment where the vehicle is located, so that the operation of the cooling system adapts to the change condition of the atmospheric pressure in the environment where the vehicle is located, and the operation control accuracy of the cooling system in the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to a cooling control method, a cooling control device and a vehicle for a vehicle. Background Art

[0002] A cooling system for cooling a transmission system is provided in a vehicle. During the driving process of the vehicle, the cooling system is controlled to start synchronously to cool down the transmission system and prevent the transmission system from overheating. In the related art, the flow rate of the cooling medium is controlled by monitoring the temperature of the cooling medium flowing in the cooling system, so as to achieve different cooling effects of the cooling system. In the actual application process, in addition to the driving conditions of the vehicle itself, the changes in the external environment where the vehicle is located will also affect the cooling effect of the cooling system. Controlling the flow rate of the cooling medium only by the temperature of the cooling medium cannot accurately and real-time reflect the current actual cooling demand, and the control accuracy of the cooling system in the related art needs to be improved. Summary of the Invention

[0003] The present application provides a cooling control method, a cooling control device and a vehicle for a vehicle to improve the accuracy of the operation control of the cooling system in the vehicle.

[0004] The present application provides a cooling control method for a vehicle. The vehicle includes a transmission system and a cooling system for cooling the transmission system. The cooling system includes a cooling circuit in which a cooling medium flows. The control method includes: obtaining a temperature parameter for characterizing the temperature of the transmission system and / or the cooling medium in the vehicle, and an atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located; controlling the flow rate of the cooling medium in the cooling circuit according to the temperature parameter and the atmospheric pressure parameter.

[0005] Optionally, controlling the flow rate of the cooling medium in the cooling circuit according to the temperature parameter and the atmospheric pressure parameter includes: when the atmospheric pressure parameter characterizes that the atmospheric pressure in the environment where the vehicle is located is within a set pressure range, determining a target control parameter according to the temperature parameter to control the flow rate of the cooling medium in the cooling circuit; when the atmospheric pressure parameter characterizes that the atmospheric pressure in the environment where the vehicle is located is not within the set pressure range, determining a target control parameter according to the atmospheric pressure parameter and the temperature parameter to control the flow rate of the cooling medium in the cooling circuit; wherein the target control parameter includes a target flow rate or a target operating parameter of a component in the cooling system for adjusting the flow rate of the cooling medium.

[0006] Optionally, determining the target control parameter according to the atmospheric pressure parameter and the temperature parameter includes: determining a basic control parameter according to the temperature parameter; determining a compensation control parameter according to the atmospheric pressure parameter; determining the target control parameter according to the basic control parameter and the compensation control parameter.

[0007] Optionally, the set pressure range is a pressure range where the atmospheric pressure is greater than or equal to the first pressure threshold, and the first pressure threshold is less than 1 atm; the compensation control parameter is greater than 0; determining the target parameter according to the basic control parameter and the compensation control parameter includes: determining the sum value of the basic control parameter and the compensation control parameter as the target parameter; wherein, the compensation control parameter is negatively correlated with the atmospheric pressure characterized by the atmospheric pressure parameter.

[0008] Optionally, the cooling circuit includes a first cooling circuit and a second cooling circuit, and the first cooling circuit exchanges heat with the second cooling circuit and is not connected; the cooling system further includes a first cooler, a second cooler, a first pump and a second pump; wherein, at least part of the transmission system, the first pump and the first cooler are connected to form a first cooling circuit, and the first pump is used to adjust the flow rate of the cooling medium in the first cooling circuit; the first cooler, the second pump and the second cooler are connected to form a second cooling circuit, and the second pump is used to adjust the flow rate of the cooling medium in the second cooling circuit; the target operating parameter includes the target speed of the first pump and / or the second pump; determining the target control parameter according to the temperature parameter includes: determining the target speed of the first pump and / or the second pump according to the temperature parameter.

[0009] Optionally, the transmission system includes a clutch and a drive motor; the temperature parameters include: the surface temperature of the clutch, the temperature of the drive motor, and the first temperature of the cooling medium in the first cooling circuit; determining the target speed of the first pump according to the temperature parameter includes: determining the target speed of the first pump according to the surface temperature of the clutch, the temperature of the drive motor, and the first temperature of the cooling medium in the first cooling circuit.

[0010] Optionally, determining the target speed of the first pump according to the surface temperature of the clutch, the temperature of the drive motor, and the first temperature of the cooling medium in the first cooling circuit includes: determining the first speed according to the surface temperature of the clutch and the first temperature of the cooling medium in the first cooling circuit; determining the second speed according to the temperature of the drive motor and the first temperature of the cooling medium in the first cooling circuit; determining the larger of the first speed and the second speed as the first target speed of the first pump.

[0011] Optionally, the temperature parameter includes the first temperature of the cooling medium in the first cooling circuit and the second temperature of the cooling medium in the second cooling circuit; determining the target speed of the second pump according to the temperature parameter includes: determining the second target speed of the second pump according to the first temperature of the cooling medium in the first cooling circuit and the second temperature of the cooling medium in the second cooling circuit.

[0012] Optionally, the cooling system further includes a fan for heat dissipation; the set pressure range is a pressure range where the atmospheric pressure is greater than or equal to the second pressure threshold, and the second pressure threshold is less than 1 atm; the control method further includes: when the atmospheric pressure parameter characterizing the atmospheric pressure in the environment where the vehicle is located is not within the set pressure range, controlling the fan to increase its rotation speed.

[0013] Optionally, the vehicle further includes a power system; obtaining an atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located includes: controlling the power system of the vehicle to keep running; obtaining the atmospheric pressure parameter.

[0014] This application provides a cooling control device for a vehicle, including one or more processors for implementing the aforementioned cooling control method for the vehicle.

[0015] This application provides a vehicle, including: a transmission system; a cooling system for cooling the transmission system, the cooling system including a cooling circuit through which a cooling medium flows; and the aforementioned cooling control device for the vehicle, electrically connected to the cooling system.

[0016] The cooling control method, cooling control device, and vehicle provided by this application jointly control the flow rate of the cooling medium in the cooling circuit according to a temperature parameter for characterizing the temperature of the transmission system and / or the cooling medium in the vehicle and an atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located. In this way, the flow rate of the cooling medium in the cooling circuit can be adjusted according to the change in the atmospheric pressure in the environment where the vehicle is located, so that the operation of the cooling system adapts to the change in the atmospheric pressure in the environment where the vehicle is located, thereby improving the accuracy of the operation control of the cooling system in the vehicle. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of a cooling system provided by an embodiment of this application;

[0018] Figure 2 is a schematic flowchart of a cooling control method for a vehicle provided by an embodiment of this application;

[0019] Figure 3 is a schematic flowchart of a cooling control method for a vehicle provided by another embodiment of this application;

[0020] Figure 4 is a schematic flowchart of a cooling control method for a vehicle provided by another embodiment of this application;

[0021] Figure 5 is a schematic flowchart of a cooling control method for a vehicle provided by another embodiment of this application.

[0022] Reference Signs

[0023] 10: Transmission system; 101: Clutch; 102: Drive motor; 201: First cooling circuit; 202: Second cooling circuit; 21: First cooler; 22: Second cooler; 23: First pump; 24: Second pump; 30: Fan. Detailed implementation

[0024] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings.

[0025] This application provides a vehicle, including a transmission system, a cooling system, and a cooling control device for the vehicle. The cooling system includes a cooling circuit through which a cooling medium flows, for cooling the transmission system. The cooling control device for the vehicle is electrically connected to the cooling device. The cooling control device for the vehicle includes one or more processors for implementing a cooling control method for the vehicle.

[0026] Specifically, in combination with Figure 1 As shown, in some embodiments, the cooling circuit includes a first cooling circuit and a second cooling circuit, and the first cooling circuit exchanges heat with the second cooling circuit and is not connected. The cooling system further includes a first cooler, a second cooler, a first pump, and a second pump. Among them, at least part of the transmission system, the first pump, and the first cooler are connected to form a first cooling circuit, and the first pump is used to adjust the flow rate of the cooling medium in the first cooling circuit. The first cooler, the second pump, and the second cooler are connected to form a second cooling circuit, and the second pump is used to adjust the flow rate of the cooling medium in the second cooling circuit.

[0027] The first cooling circuit contains cooling oil, and the second cooling circuit contains coolant. In some embodiments, the coolant is cooling water. During operation, the first pump operates to make the cooling oil flow in the first cooling circuit, and the second pump operates to make the coolant flow in the second cooling circuit. The cooling oil exchanges heat with the transmission system, absorbs heat, and the temperature increases; the heated cooling oil continues to flow to the first cooler, exchanges heat with the coolant in the second circuit, the temperature of the cooling oil decreases, and it continues to enter the subsequent cycle. After the coolant flowing through the first cooler absorbs heat and increases in temperature, it exchanges heat with the external environment in the second cooler, cools down, and then enters the subsequent cycle.

[0028] In at least some embodiments, the cooling system further includes a fan for heat dissipation. The fan is disposed near the second cooler for promoting heat dissipation of the second cooler to improve the overall cooling efficiency of the cooling system.

[0029] In combination with Figure 2 As shown, an embodiment of this application provides a cooling control method for a vehicle, including steps S10 to S20.

[0030] Step S10: Obtain a temperature parameter for characterizing the temperature of the transmission system and / or the cooling medium in the vehicle, and an atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located.

[0031] Here, in some embodiments, the vehicle is provided with an atmospheric pressure sensor, and the real-time detection value of the atmospheric pressure sensor is used as the atmospheric pressure parameter here. More specifically, the atmospheric pressure sensor is disposed at the air inlet of the vehicle engine. In this way, it is beneficial to reduce the interference of the external environment and improve the accuracy of the real-time detection value of the atmospheric pressure. In other embodiments, a value that can indirectly reflect the atmospheric pressure in the environment where the vehicle is located, such as altitude monitoring, can be used as the atmospheric pressure parameter.

[0032] The vehicle further includes a power system. In some embodiments, obtaining an atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located includes: controlling the power system of the vehicle to keep running; and obtaining the atmospheric pressure parameter. Specifically, if the vehicle is a traditional fuel vehicle, the engine is prohibited from shutting down. If the vehicle is a hybrid vehicle or a pure electric vehicle, the high-voltage system of the whole vehicle is kept powered on. In this way, it is beneficial to ensure the effectiveness and accuracy of the detection of the atmospheric pressure parameter. Especially when monitoring the atmospheric pressure through an atmospheric pressure sensor disposed at the air inlet of the vehicle engine.

[0033] Step S20: Control the flow rate of the cooling medium in the cooling circuit according to the temperature parameter and the atmospheric pressure parameter.

[0034] Here, the flow rate of the cooling medium in the cooling circuit can be adjusted by adjusting the rotation speed of the first pump and / or the second pump.

[0035] Adopting the vehicle cooling control method provided by the embodiments of the present application, according to the temperature parameter for characterizing the temperature of the transmission system and / or the cooling medium in the vehicle and the atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located, jointly control the flow rate of the cooling medium in the cooling circuit. In this way, the flow rate of the cooling medium in the cooling circuit can be adjusted according to the change of the atmospheric pressure in the environment where the vehicle is located, so that the operation of the cooling system adapts to the change of the atmospheric pressure in the environment where the vehicle is located, thereby improving the accuracy of the operation control of the cooling system in the vehicle.

[0036] Specifically, in some embodiments, controlling the flow rate of the cooling medium in the cooling circuit according to the temperature parameter and the atmospheric pressure parameter includes: when the atmospheric pressure parameter indicates that the atmospheric pressure in the environment where the vehicle is located is within the set pressure range, determining the target control parameter according to the temperature parameter to control the flow rate of the cooling medium in the cooling circuit. When the atmospheric pressure parameter indicates that the atmospheric pressure in the environment where the vehicle is located is not within the set pressure range, determining the target control parameter according to the atmospheric pressure parameter and the temperature parameter to control the flow rate of the cooling medium in the cooling circuit. The set pressure range is pre-set and stored, and can be directly called during the implementation process. After obtaining the temperature parameter and the atmospheric pressure parameter, corresponding to different situations of the atmospheric pressure parameter, different methods are used to determine the target control parameter. The set pressure range is used to represent the normal range of the atmospheric pressure. If the atmospheric pressure represented by the atmospheric pressure parameter is not within the set pressure range, it means that the current atmospheric pressure deviates from the normal atmospheric pressure range, which will have a certain impact on the cooling process. Therefore, it is necessary to jointly determine the target control parameter by combining the atmospheric pressure parameter and the temperature parameter to ensure the accuracy of the target control parameter and the final cooling process control. If the atmospheric pressure parameter indicates that the atmospheric pressure is within the set pressure range, it means that the current atmospheric pressure is within the normal range and will not have an additional impact on the cooling process. Therefore, only determine the target control parameter according to the temperature parameter to simplify the unnecessary calculation process.

[0037] Among them, the target control parameter includes the target flow rate or the target operating parameter of the component used to adjust the flow rate of the cooling medium in the cooling system. During the implementation process, when the target control parameter includes the target flow rate, control the component used to adjust the flow rate of the cooling medium until the flow rate of the cooling medium reaches the target flow rate. In some embodiments, corresponding to the aforementioned first pump and second pump, the target operating parameter includes the target rotational speed of the first pump and / or the second pump. In this way, the flow rate of the cooling medium in the first cooling circuit can be achieved through the target rotational speed of the first pump, and the flow rate of the cooling medium in the second cooling circuit can be achieved through the target rotational speed of the second pump.

[0038] Corresponding to this specific process of controlling the flow rate of the cooling medium in the cooling circuit according to the temperature parameter and the atmospheric pressure parameter, combined with Figure 3 make a more specific implementation manner description. Combined with Figure 3 As shown, the vehicle cooling control method includes steps S10 to step S222.

[0039] Step S10, obtain the temperature parameter used to characterize the temperature of the transmission system and / or the cooling medium in the vehicle, and the atmospheric pressure parameter used to characterize the atmospheric pressure in the environment where the vehicle is located.

[0040] Step S21, determine whether the atmospheric pressure represented by the atmospheric pressure parameter is within the set interval.

[0041] If so, execute step S221; if not, execute step S222.

[0042] Step S221: Determine the target control parameter according to the temperature parameter to control the flow rate of the cooling medium in the cooling circuit.

[0043] Step S222: Determine the target control parameter according to the atmospheric pressure parameter and the temperature parameter to control the flow rate of the cooling medium in the cooling circuit.

[0044] Here, a specific description is made of the process of determining the target control parameter according to the temperature parameter.

[0045] Corresponding to the aforementioned first pump and second pump, in some embodiments, determining the target control parameter according to the temperature parameter includes: determining the target speed of the first pump and / or the second pump according to the temperature parameter. By adjusting the target speed of the first pump, the flow rate of the cooling medium in the first cooling circuit can be adjusted, thereby affecting the overall cooling efficiency of the cooling system; by adjusting the target speed of the second pump, the flow rate of the cooling medium in the second cooling circuit can be adjusted, thereby affecting the overall cooling efficiency of the cooling system.

[0046] In some embodiments, when the transmission system includes a clutch and a drive motor, the temperature parameter includes: the surface temperature of the clutch, the temperature of the drive motor, and the first temperature of the cooling medium in the first cooling circuit. Specifically, the surface temperature of the clutch here is the surface friction temperature of the clutch, and the surface friction temperature of the clutch can be obtained through theoretical calculation or actual measurement by a temperature sensor. The temperature of the drive motor can be determined by real-time monitoring with a thermistor. The first temperature of the cooling medium in the first cooling circuit is the temperature between the first cooler and the transmission system in the first cooling circuit, and can be obtained by real-time monitoring with a temperature sensor during implementation.

[0047] The aforementioned determining the target speed of the first pump according to the temperature parameter includes: determining the target speed of the first pump according to the surface temperature of the clutch, the temperature of the drive motor, and the first temperature of the cooling medium in the first cooling circuit.

[0048] Specifically, in some embodiments, a correspondence relationship is preset between the clutch surface temperature, the drive motor temperature, the first temperature of the cooling medium in the first cooling circuit, and the target speed of the first pump. According to this correspondence relationship, the target speed of the first pump corresponding to the current clutch surface temperature, drive motor temperature, and the first temperature of the cooling medium in the first cooling circuit is determined. More specifically, in some embodiments, this correspondence relationship is embodied in the form of a correspondence table. During the implementation process, the target speed of the first pump corresponding to the current clutch surface temperature, drive motor temperature, and the first temperature of the cooling medium in the first cooling circuit is determined by looking up the table. If the temperature parameters obtained by real-time monitoring are not within this correspondence table, the target speed is calculated by interpolation based on the existing data within the correspondence table. In some embodiments, this correspondence relationship is embodied in the form of a formula. During the implementation process, based on the current clutch surface temperature, drive motor temperature, and the first temperature of the cooling medium in the first cooling circuit, the corresponding target speed is determined according to this formula. Among them, the clutch surface temperature is positively correlated with the target speed, the drive motor temperature is positively correlated with the target speed, and there is a positive correlation between the first temperature and the target speed. The clutch surface temperature and the drive motor temperature can represent the most fundamental cooling requirements, and the first temperature can represent the effect of the cooling process carried out by the first cooling circuit. Combining the clutch surface temperature, the drive motor temperature, and the first temperature of the cooling medium in the first cooling circuit to determine the target speed of the first pump is beneficial to ensuring the accuracy of the target speed, thereby improving the overall cooling effect of the cooling system.

[0049] In some embodiments, determining the target speed of the first pump according to the clutch surface temperature, the drive motor temperature, and the first temperature of the cooling medium in the first cooling circuit includes: determining a first speed according to the clutch surface temperature and the first temperature of the cooling medium in the first cooling circuit. Determining a second speed according to the drive motor temperature and the first temperature of the cooling medium in the first cooling circuit. Determining the larger one of the first speed and the second speed as the first target speed of the first pump. In this way, on the basis of the first temperature of the cooling medium in the first cooling circuit, the first speed and the second speed are respectively determined in combination with the clutch surface temperature and the drive motor temperature. The first speed can reflect the cooling requirement of the clutch surface, and the drive motor temperature can reflect the cooling requirement of the drive motor, avoiding interference between each other. After determining the first speed and the second speed, the larger one of them is used as the first target speed of the first pump to ensure that after the first pump operates at this first target speed, the cooling requirements of the clutch and the drive motor can be met.

[0050] During the implementation process, the corresponding relationships between the clutch surface temperature, the first temperature of the cooling medium in the first cooling circuit, and the first rotational speed, as well as between the driving motor temperature, the first temperature of the cooling medium in the first cooling circuit, and the second rotational speed, can be preset in advance. According to the corresponding relationships, the first rotational speed and the second rotational speed corresponding to the current real-time monitoring values are determined, and then the larger value between the first rotational speed and the second rotational speed is taken. The corresponding relationships can be reflected in the form of a corresponding relationship table. For example, Table 1 is established, and through Table 1, the first rotational speed N_Oil_C of the first pump is determined based on the clutch surface temperature and the first temperature actually monitored currently; Table 2 is established, and through Table 2, the second rotational speed N_Oil_EM of the first pump is determined based on the driving motor temperature and the first temperature actually monitored currently. Then, the target rotational speed N_Oil is determined as Max(N_Oil_C, N_Oil_EM). In other embodiments, the corresponding relationships can also be reflected in the form of formulas. During the implementation process, the first rotational speed N_Oil_C of the first pump is determined through a formula based on the clutch surface temperature and the first temperature actually monitored currently; the second rotational speed N_Oil_EM of the first pump is determined through a formula based on the driving motor temperature and the first temperature actually monitored currently. Then, the target rotational speed N_Oil is determined as Max(N_Oil_C, N_Oil_EM).

[0051] Table 1:

[0052]

[0053] Table 2:

[0054]

[0055] In some embodiments, the temperature parameters include the first temperature of the cooling medium in the first cooling circuit and the second temperature of the cooling medium in the second cooling circuit. Determining the target rotational speed of the second pump according to the temperature parameters includes: determining the second target rotational speed of the second pump according to the first temperature of the cooling medium in the first cooling circuit and the second temperature of the cooling medium in the second cooling circuit. The actual function of the second cooling circuit is to cool the cooling medium in the first cooling circuit. Through the first temperature of the cooling medium in the first cooling circuit and the second temperature of the cooling medium in the second cooling circuit, the cooling operation status of the second cooling circuit can be accurately reflected. Therefore, determining the second target rotational speed of the second pump according to the first temperature of the cooling medium in the first cooling circuit and the second temperature of the cooling medium in the second cooling circuit can ensure the accuracy of the determined second target rotational speed of the second pump, thereby realizing the accurate control of the second cooling circuit. Here, the second temperature is the temperature of the cooling medium flowing from the second cooler to the first cooler in the second cooling circuit. It can be measured by setting a temperature sensor, and the temperature sensor is set between the outlet of the second cooler and the inlet of the first cooler.

[0056] During the implementation process, a corresponding relationship can be established among the first temperature of the cooling medium in the first cooling circuit, the second temperature of the cooling medium in the second cooling circuit, and the second target speed of the second pump. Based on this corresponding relationship, the second target speed of the second pump can be determined according to the actually monitored first temperature and second temperature. This corresponding relationship can be embodied in the form of a corresponding relationship table. For example, Table 3 is established, and the second target speed N_W of the second pump is determined according to Table 3 based on the actually monitored first temperature and second temperature. In other embodiments, this corresponding relationship can be embodied in the form of a formula, and the second target speed of the second pump is determined according to the formula based on the actually monitored first temperature and second temperature. Among them, the second target speed is positively correlated with the first temperature, and the second target speed is positively correlated with the second temperature. The higher the first temperature and the second temperature, the higher the current cooling requirement. Therefore, a higher second target speed is required to increase the flow rate of the cooling medium in the second cooling circuit, thereby improving the cooling efficiency and cooling the cooling medium in the first cooling circuit faster.

[0057] Table 3:

[0058]

[0059] As a feasible implementation method, in combination with Figure 4 as shown, the present application provides a cooling control method for a vehicle, including steps S10 to S2223.

[0060] Step S10: Obtain a temperature parameter for characterizing the temperature of the transmission system and / or the cooling medium in the vehicle, and an atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located.

[0061] Step S21: Determine whether the atmospheric pressure characterized by the atmospheric pressure parameter is within a set range.

[0062] If so, execute step S221; if not, execute step S222.

[0063] Step S221: Determine a target control parameter according to the temperature parameter to control the flow rate of the cooling medium in the cooling circuit.

[0064] Step S2221: Determine a basic control parameter according to the temperature parameter.

[0065] Step S2222: Determine a compensation control parameter according to the atmospheric pressure parameter.

[0066] Step S2223: Determine a target control parameter according to the basic control parameter and the compensation control parameter to control the flow rate of the cooling medium in the cooling circuit.

[0067] Specifically, in some embodiments, the set pressure range is a pressure range where the atmospheric pressure is greater than or equal to the first pressure threshold, and the first pressure threshold is less than 1 atm; the compensation control parameter is greater than 0. The target parameter is determined according to the basic control parameter and the compensation control parameter, including: determining the sum value of the basic control parameter and the compensation control parameter as the target parameter. Among them, the compensation control parameter is negatively correlated with the atmospheric pressure characterized by the atmospheric pressure parameter. Since some heat dissipation in the cooling system needs to be carried out with the outside air, when the atmospheric pressure in the environment where the vehicle is located decreases, the air density decreases, which will affect the heat dissipation efficiency and thus affect the cooling effect of the overall cooling system. Specifically, the second cooler in the second cooling circuit dissipates heat to the outside air. When the air density decreases, the heat dissipation efficiency of the second cooler decreases, resulting in too high a temperature of the cooling medium in the second cooling circuit, which in turn causes too high a temperature of the cooling medium in the first cooling circuit that exchanges heat with the second cooling circuit, and further leads to poor cooling efficiency and overheating of the transmission system. Here, when the atmospheric pressure is less than the first pressure threshold, the compensation control parameter is added to the basic control parameter to increase the flow rate of the cooling medium in the cooling system, which is beneficial to improving the overall cooling efficiency and making up for the cooling efficiency loss caused by too low atmospheric pressure. Moreover, the atmospheric pressure and the compensation control parameter are negatively correlated. The smaller the atmospheric pressure, the greater the negative impact on the cooling efficiency of the cooling system. At this time, the larger the compensation control parameter, the higher the cooling efficiency can be improved.

[0068] The value range of the first pressure threshold here is from 0.94 atm to 0.96 atm. For example, it can be taken as 0.95 atm. Taking this as the value of the first pressure threshold can accurately screen out the situation of too low atmospheric pressure, so as to achieve accurate control of the cooling system.

[0069] At this time, the process of judging whether the atmospheric pressure characterized by the atmospheric pressure parameter is within the set range is equivalent to judging whether the atmospheric pressure characterized by the atmospheric pressure parameter is greater than or equal to the first pressure threshold. The subsequent steps are as follows: if the atmospheric pressure characterized by the atmospheric pressure parameter is greater than or equal to the first pressure threshold, then step S221 is executed; if the atmospheric pressure characterized by the atmospheric pressure parameter is less than the first pressure threshold, then steps S2221 to S2223 are executed. In some embodiments, in order to avoid frequent switching of the control logic, a compensation value is added on the basis of the first pressure threshold for switching judgment. That is, if it is monitored that the atmospheric pressure characterized by the atmospheric pressure parameter is greater than or equal to the sum value of the first pressure threshold and the compensation value, then it is switched to step S221; if it is monitored that the atmospheric pressure characterized by the atmospheric pressure parameter is less than the difference obtained by subtracting the compensation value from the first pressure threshold, then it is switched to steps S2221 to S2223.

[0070] For the process of determining the compensation control parameter according to the atmospheric pressure parameter: During the implementation process, the atmospheric pressure parameter or the corresponding relationship between the atmospheric pressure characterized by the atmospheric pressure parameter and the compensation control parameter can be preset in advance. During the application process, the corresponding compensation control parameter can be determined according to the current atmospheric pressure parameter. The corresponding relationship here can be reflected in the form of a corresponding relationship table or a corresponding relationship formula. For example, the compensation control parameter is the compensation speed, including the compensation speed of the first pump and the compensation speed of the second pump. A corresponding relationship table between the atmospheric pressure and the compensation speed of the first pump as shown in Table 4 is established, and a corresponding relationship table between the atmospheric pressure and the compensation speed of the second pump as shown in Table 5 is established. According to the corresponding relationship table shown in Table 4, the compensation speed of the first pump corresponding to the current atmospheric pressure can be determined, and according to the corresponding relationship table shown in Table 5, the compensation speed of the second pump corresponding to the current atmospheric pressure can be determined.

[0071] Table 4:

[0072]

[0073] Table 5:

[0074]

[0075] In some embodiments, in the corresponding relationship tables shown in Table 4 and Table 5, the atmospheric pressure value ranges from 70 kPa to 101 kPa. Correspondingly, the compensation speed N_Oil_Offs of the first pump ranges from 1200 to 0 revolutions per minute, and the compensation speed N_W_Offs of the second pump ranges from 900 to 0 revolutions per minute.

[0076] In some embodiments, the process of determining the target control parameter according to the temperature parameter and the process of determining the basic control parameter according to the temperature parameter adopt the same implementation manner. This will not be repeated here.

[0077] On this basis, in some embodiments, the judgment of the atmospheric pressure parameter can be carried out after calculating the basic control parameter. That is, after determining the basic control parameter according to the temperature parameter, it is then determined whether additional compensation control parameters are needed according to the judgment of the atmospheric pressure parameter. Correspondingly, as shown in Figure 5 This application embodiment provides a cooling control method for a vehicle, including steps S10 to step S204.

[0078] Step S10, obtaining a temperature parameter for characterizing the temperature of the transmission system and / or the cooling medium in the vehicle, and an atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located.

[0079] Step S201, determining a reference control parameter according to the temperature parameter.

[0080] For example, determine the base speed of the first pump and the base speed of the second pump according to the temperature parameters respectively.

[0081] Step S202, determine whether the atmospheric pressure characterized by the atmospheric pressure is less than or equal to the first pressure threshold.

[0082] The first pressure threshold here is less than 1 atm.

[0083] If so, execute step S231; if not, execute step S232.

[0084] Step S231, determine the compensation control parameter according to the atmospheric pressure parameter.

[0085] The compensation parameter is greater than 0.

[0086] For example, determine the compensation speed of the first pump and the compensation speed of the second pump according to the atmospheric pressure parameter respectively.

[0087] Step S232, determine that the compensation control parameter is 0.

[0088] Step S204, determine the sum value of the reference control parameter and the compensation control parameter as the target control parameter to control the flow rate of the cooling medium in the cooling circuit.

[0089] For example, determine the target speed of the first pump as the sum value of the base speed of the first pump and the compensation speed of the first pump, and determine the target speed of the second pump as the sum value of the base speed of the second pump and the compensation speed of the second pump.

[0090] In some embodiments, the set pressure range is the pressure range where the atmospheric pressure is greater than or equal to the second pressure threshold, and when the second pressure threshold is less than 1 atm, the control method of the vehicle further includes: when the atmospheric pressure parameter characterizing the atmospheric pressure in the environment where the vehicle is located is not within the set pressure range, control the fan to increase the speed. In this way, it is beneficial to promote the heat dissipation process of the cooling system, beneficial to improving the cooling efficiency of the overall cooling system, and beneficial to making up for the cooling efficiency loss caused by too low atmospheric pressure. Specifically, the smaller the atmospheric pressure represented by the atmospheric pressure parameter, the greater the air volume of the fan speed.

[0091] In some embodiments, the set pressure range is a pressure range where the atmospheric pressure is less than or equal to a third pressure threshold, and here the third pressure threshold is greater than 1 atm; the compensation control parameter is less than 0. Determining the target control parameter according to the basic control parameter and the compensation control parameter includes: determining the sum value of the basic control parameter and the compensation control parameter as the target control parameter. In this way, when the atmospheric pressure is too high, appropriately reducing the rotational speed of the first pump and / or the second pump is beneficial to reducing energy consumption while meeting the cooling requirements. More specifically, the compensation control parameter is negatively correlated with the atmospheric pressure characterized by the atmospheric pressure parameter. In this way, more accurate control of the cooling system can be achieved.

[0092] In the description of the present application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A cooling control method for a vehicle, characterized in that, The vehicle includes a transmission system and a cooling system for cooling the transmission system, and the cooling system includes a cooling circuit through which a cooling medium flows; The control method includes: obtaining a temperature parameter for characterizing the temperature of the transmission system and / or the cooling medium in the vehicle, and an atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located; controlling the flow rate of the cooling medium in the cooling circuit according to the temperature parameter and the atmospheric pressure parameter.

2. The cooling control method according to claim 1, wherein The controlling the flow rate of the cooling medium in the cooling circuit according to the temperature parameter and the atmospheric pressure parameter includes: when the atmospheric pressure parameter characterizes that the atmospheric pressure in the environment where the vehicle is located is within a set pressure range, determining a target control parameter according to the temperature parameter to control the flow rate of the cooling medium in the cooling circuit; when the atmospheric pressure parameter characterizes that the atmospheric pressure in the environment where the vehicle is located is not within the set pressure range, determining a target control parameter according to the atmospheric pressure parameter and the temperature parameter to control the flow rate of the cooling medium in the cooling circuit; wherein, the target control parameter includes a target flow rate or a target operating parameter of a component in the cooling system for adjusting the flow rate of the cooling medium.

3. The cooling control method according to claim 2, wherein The determining the target control parameter according to the atmospheric pressure parameter and the temperature parameter includes: determining a basic control parameter according to the temperature parameter; determining a compensation control parameter according to the atmospheric pressure parameter; determining the target control parameter according to the basic control parameter and the compensation control parameter.

4. The cooling control method according to claim 3, wherein The set pressure range is a pressure range where the atmospheric pressure is greater than or equal to a first pressure threshold, and the first pressure threshold is less than 1 atm; The compensation control parameter is greater than 0; The determining the target parameter according to the basic control parameter and the compensation control parameter includes: determining the sum value of the basic control parameter and the compensation control parameter as the target parameter; wherein, the compensation control parameter is negatively correlated with the atmospheric pressure characterized by the atmospheric pressure parameter.

5. The cooling control method according to claim 2, characterized in that The cooling circuit includes a first cooling circuit and a second cooling circuit, and the first cooling circuit exchanges heat with the second cooling circuit and is not connected; The cooling system further includes a first cooler, a second cooler, a first pump and a second pump; wherein, at least part of the transmission system, the first pump and the first cooler are connected to form a first cooling circuit, and the first pump is used to adjust the flow rate of the cooling medium in the first cooling circuit; The first cooler, the second pump and the second cooler are connected to form a second cooling circuit, and the second pump is used to adjust the flow rate of the cooling medium in the second cooling circuit; The target operating parameter includes the target speed of the first pump and / or the second pump; The determining the target control parameter according to the temperature parameter includes: determining the target speed of the first pump and / or the second pump according to the temperature parameter.

6. The cooling control method according to claim 5, characterized in that The transmission system includes a clutch and a drive motor; The temperature parameter includes: the surface temperature of the clutch, the temperature of the drive motor, and the first temperature of the cooling medium in the first cooling circuit; Determining the target speed of the first pump according to the temperature parameter includes: Determining the target speed of the first pump according to the clutch surface temperature, the driving motor temperature, and the first temperature of the cooling medium in the first cooling circuit.

7. The cooling control method according to claim 6, wherein The determining the target speed of the first pump according to the clutch surface temperature, the driving motor temperature, and the first temperature of the cooling medium in the first cooling circuit includes: Determining a first speed according to the clutch surface temperature and the first temperature of the cooling medium in the first cooling circuit; Determining a second speed according to the driving motor temperature and the first temperature of the cooling medium in the first cooling circuit; Determining the larger of the first speed and the second speed as the first target speed of the first pump.

8. The cooling control method according to claim 5, characterized in that, The temperature parameter includes the first temperature of the cooling medium in the first cooling circuit and the second temperature of the cooling medium in the second cooling circuit; Determining the target speed of the second pump according to the temperature parameter includes: Determining the second target speed of the second pump according to the first temperature of the cooling medium in the first cooling circuit and the second temperature of the cooling medium in the second cooling circuit.

9. The cooling control method according to claim 2, characterized in that The cooling system further includes a fan for heat dissipation; the set pressure range is a pressure range where the atmospheric pressure is greater than or equal to the second pressure threshold, and the second pressure threshold is less than 1 atm; The control method further includes: When the atmospheric pressure parameter indicates that the atmospheric pressure in the environment where the vehicle is located is not within the set pressure range, controlling the fan to increase its speed.

10. The cooling control method according to any one of claims 1 to 9, characterized in that The vehicle further includes a power system; Obtaining an atmospheric pressure parameter for characterizing the atmospheric pressure in the environment where the vehicle is located includes: Controlling the power system of the vehicle to keep running; Obtaining the atmospheric pressure parameter.

11. A cooling control device for a vehicle, characterized in that, Including one or more processors for implementing the vehicle cooling control method according to any one of claims 1-10.

12. A vehicle, characterized in that, Including: A transmission system; A cooling system for cooling the transmission system, the cooling system including a cooling circuit through which a cooling medium flows; And The vehicle cooling control device according to claim 11, electrically connected to the cooling system.

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