Motor cooling control method and device, vehicle and storage medium

Abstract

The application relates to a motor cooling control method and device, a vehicle and a storage medium, wherein the motor cooling control method comprises the following steps: when it is determined that the motor is in a non-high-temperature working state, it is judged whether the total power consumption of the motor and a cooling system thereof increases in adjacent first time periods; if it is determined that the total power consumption increases in the adjacent first time periods, the requested flow of the motor is adjusted according to a set type temperature of the motor and a first temperature limit value; and the flow supply of the cooling system is adjusted according to the adjusted requested flow. In the application, when the motor is cooled and controlled, the flow supply of the cooling system is determined by comprehensively judging the total power consumption of the motor and the cooling system thereof and the set type temperature of the motor, so that the timeliness of the motor cooling control can be ensured, and the total power consumption of the motor and the cooling system thereof can be maximally reduced while the motor is prevented from overtemperature.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a motor cooling control method, device, vehicle, and storage medium. Background Technology

[0002] With the rapid development of new energy vehicles, the requirements for electrification are becoming increasingly stringent. As a major component of new energy vehicles, electric motors are being used more and more widely, and the requirements for their use are becoming increasingly demanding. This includes not only ensuring the reliability and performance output of the motor, but also controlling its system power consumption to reduce overall system power consumption.

[0003] Because electric motors are electrical components, their thermal management requirements are extremely high. Excessive motor temperature not only affects motor performance but can also easily damage motor components, leading to motor failure. Therefore, motors are designed with a maximum temperature limit. However, motors generate heat whenever they operate, making cooling control crucial for maximizing motor performance.

[0004] Currently, there are various cooling methods for electric motors, including water cooling, oil cooling, and a combination of water and oil cooling. The ultimate goal of different cooling media and methods is to manage the motor's temperature, preventing overheating and protecting the motor. However, while increasing the flow rate of the cooling medium lowers the motor temperature and improves its efficiency, thus reducing power consumption, it also increases the wear and tear on the cooling pumps (electronic pumps, mechanical pumps, etc.) in the cooling system. Therefore, finding a balance between these two factors is crucial. Summary of the Invention

[0005] One objective of this application is to provide a motor cooling control method that can effectively balance the power consumption of the motor and the power consumption of the cooling system, thereby minimizing the total power consumption of the motor and the cooling system; another objective of this application is to provide a motor cooling control device; a third objective of this application is to provide a vehicle; and a fourth objective of this application is to provide a storage medium.

[0006] To achieve the above objectives, in a first aspect, this application provides a motor cooling control method, the motor cooling control method comprising:

[0007] Once it is determined that the motor is operating at a non-high temperature state, it is determined whether the total power consumption of the motor and its cooling system increases within the adjacent first time period.

[0008] If it is determined that the total power consumption increases within an adjacent first time period, the requested flow rate of the motor is adjusted according to the set type temperature of the motor and the first temperature limit.

[0009] The flow supply of the cooling system is adjusted according to the adjusted request flow.

[0010] Further, adjusting the requested flow rate of the motor according to the set type temperature of the motor and the first temperature limit includes:

[0011] If it is determined that the set temperature is less than or equal to the first temperature limit, then the requested flow rate of the motor is adjusted according to the change in the total power consumption within adjacent first time periods; and / or,

[0012] If it is determined that the set type temperature is greater than the first temperature limit, the requested flow rate of the motor is adjusted according to the change of the set type temperature in the adjacent second time period.

[0013] Further, adjusting the motor's request flow based on the change in total power consumption within adjacent first time periods includes:

[0014] If it is determined that the rate of change of total power consumption within adjacent first time periods is less than the rate of change threshold, then the product of the first set coefficient and the preset flow rate change is determined as the first flow rate change.

[0015] Reduce the requested flow rate of the motor by the first flow rate change.

[0016] Further, adjusting the motor's request flow based on the change in total power consumption within adjacent first time periods includes:

[0017] If it is determined that the rate of change of total power consumption within adjacent first time periods is greater than or equal to the rate of change threshold, then the sum of the first set coefficient and the second set coefficient is determined as the adjustment coefficient for the preset flow rate change.

[0018] The product of the adjustment coefficient and the preset flow rate change is determined as the second flow rate change.

[0019] Reduce the requested flow rate of the motor by the second flow rate change.

[0020] Further, adjusting the motor's requested flow rate based on the temperature changes of the set type within adjacent second time periods includes:

[0021] If it is determined that the temperature change value of the set type temperature within an adjacent second time period is less than the third temperature limit, the requested flow rate of the motor is reduced according to the first set rule; and / or,

[0022] If the temperature change value is determined to be greater than or equal to the third temperature limit and less than the fourth temperature limit, the requested flow rate of the motor is increased according to the second set rule; and / or,

[0023] If the temperature change value is determined to be greater than or equal to the fourth temperature limit, the requested flow rate of the motor is adjusted to the preset requested flow rate.

[0024] Further, reducing the motor's request flow according to the first set rule includes:

[0025] The product of the third set coefficient and the preset flow rate change is determined as the third flow rate change.

[0026] The motor's requested flow rate is gradually reduced by the third flow rate change until the total power consumption no longer increases within the adjacent first time period.

[0027] Furthermore, increasing the request flow of the motor according to the second set rule includes:

[0028] The product of the fourth set coefficient and the preset flow rate change is determined as the fourth flow rate change.

[0029] The requested flow rate of the motor is gradually increased by the fourth flow rate change until the total power consumption no longer increases within the adjacent first time period.

[0030] Furthermore, the motor cooling control method includes:

[0031] If it is determined that the motor is not in the non-high temperature operating state, the requested flow rate of the motor is adjusted to the preset requested flow rate.

[0032] Furthermore, determining that the motor is in a non-high-temperature operating state includes:

[0033] The set temperature is determined to be less than or equal to the second temperature limit.

[0034] Further, adjusting the flow supply of the cooling system based on the adjusted request flow includes:

[0035] Based on the adjusted requested flow rate, as well as the type of cooling pump and the type of cooling medium in the cooling system, the flow rate supply corresponding to different types of cooling pumps under different types of cooling media is determined.

[0036] To achieve the above objectives, secondly, this application also provides a motor cooling control device, the motor cooling control device comprising:

[0037] The determination module is used to determine whether the total power consumption of the motor and its cooling system increases within an adjacent first time period when the motor is in a set state.

[0038] An adjustment module is used to adjust the motor's request flow rate according to the motor's set type temperature and a first temperature limit if it is determined that the total power consumption increases within an adjacent first time period.

[0039] The adjustment module is also used to adjust the flow supply of the cooling system according to the adjusted request flow.

[0040] To achieve the above objectives, in a third aspect, this application also provides a vehicle, including: a processor and a memory, the processor being configured to execute a control program stored in the memory to implement the motor cooling control method as described above.

[0041] To achieve the above objectives, in a fourth aspect, this application also provides a storage medium storing one or more programs that can be executed by one or more processors to implement the motor cooling control method described above.

[0042] The beneficial effects of this application are:

[0043] In this application, when the motor is operating at a non-high temperature, if the total power consumption of the motor and its cooling system increases within an adjacent first time period, the requested flow rate of the motor can be adjusted according to the set type temperature of the motor and the first temperature limit, thereby adjusting the flow supply of the cooling system. In other words, in this application, when controlling the cooling of the motor, the flow supply of the cooling system is determined by comprehensively judging the total power consumption of the motor and its cooling system as well as the set type temperature of the motor. This ensures the timeliness of the motor cooling control and minimizes the total power consumption of the motor and its cooling system while preventing the motor from overheating. Attached Figure Description

[0044] Figure 1 This diagram illustrates a flow chart of a motor cooling control method provided in an embodiment of this application.

[0045] Figure 2 This diagram illustrates a block diagram of an electric motor and its cooling system according to an embodiment of this application.

[0046] Figure 3 This diagram illustrates a block diagram of an electric motor and its cooling system according to an embodiment of this application.

[0047] Figure 4 This diagram illustrates a block diagram of an electric motor and its cooling system according to an embodiment of this application.

[0048] Figure 5 This diagram illustrates a block diagram of an electric motor and its cooling system according to an embodiment of this application.

[0049] Figure 6 This diagram illustrates a block diagram of an electric motor and its cooling system according to an embodiment of this application.

[0050] Figure 7 This diagram illustrates a block diagram of an electric motor and its cooling system according to an embodiment of this application.

[0051] Figure 8 This diagram illustrates a block diagram of an electric motor and its cooling system according to an embodiment of this application.

[0052] Figure 9 This diagram illustrates the structure of a motor cooling control device according to an embodiment of this application.

[0053] Figure 10 This illustration shows a structural diagram of a vehicle according to an embodiment of this application;

[0054] in:

[0055] 1. Storage cavity; 11. First storage cavity; 12. Second storage cavity; 2. Motor; 3. Electronic pump; 31. First electronic pump; 32. Second electronic pump; 4. Mechanical pump; 41. First mechanical pump; 42. Second mechanical pump;

[0056] 10. Define the module; 20. Adjust the module;

[0057] 100. Vehicle; 101. Processor; 102. Memory; 1021. Operating system; 1022. Application program; 103. User interface; 104. Network interface; 105. Bus system. Detailed Implementation

[0058] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0059] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0060] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0061] To facilitate understanding of the embodiments of this application, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application.

[0062] This embodiment provides a motor cooling control method that can be applied to vehicles. (Reference) Figure 1 As shown, the method may include:

[0063] S110. After determining that the motor is in a non-high temperature operating state, determine whether the total power consumption of the motor and its cooling system increases in the adjacent first time period.

[0064] S120. If it is determined that the total power consumption increases within the adjacent first time period, the motor's requested flow rate is adjusted according to the motor's set type temperature and the first temperature limit.

[0065] S130. Adjust the flow supply of the cooling system according to the adjusted requested flow rate.

[0066] In step S110, the non-high-temperature operating state can refer to the state where the motor's set type temperature does not exceed the second temperature limit. That is, if the motor's set type temperature is determined to be less than or equal to the second temperature limit, the motor is determined to be in a non-high-temperature operating state. If the motor's set type temperature is determined to be greater than the second temperature limit, the motor is determined not to be in a non-high-temperature operating state, i.e., the motor is determined to be in a high-temperature operating state. High-temperature operating state and non-high-temperature operating state are relative concepts; generally, the motor is in one of these states.

[0067] The temperature boundary of the cooling system generally includes the temperature of the cooling medium flowing into and out of the motor, and can be detected by a temperature sensor. The setpoint temperature can be set according to actual conditions and is not limited thereto. The setpoint temperature can be the average temperature or the maximum temperature of the motor determined based on the temperature boundary of the cooling system and the motor's operating conditions. The setpoint temperature can also be the temperature detected by a preset temperature sensor of the motor. Other types of temperatures are also possible and are not limited thereto.

[0068] It should be noted that different types of temperature settings correspond to different values ​​for the second temperature limit.

[0069] If the set type temperature is the highest temperature of the motor, then the second temperature limit can be the highest temperature limit that the motor can withstand. If the set type temperature is the average temperature or the detected temperature of the motor, then the temperature difference between the two and the highest temperature limit needs to be obtained, and the second temperature limit can be the highest temperature limit that the motor can withstand minus the corresponding temperature difference.

[0070] In this step, once it's determined that the motor is operating at a high temperature, it indicates that the motor temperature is already high enough and requires intensive cooling. In this case, the requested flow rate for the motor can be adjusted to a preset requested flow rate. The preset requested flow rate can be set according to actual conditions, and its specific value is not limited. The preset requested flow rate can correspond to the maximum cooling flow rate of the cooling system. That is, when it's determined that the motor is operating at a high temperature, the flow rate supply of the cooling system is adjusted to the maximum cooling flow rate.

[0071] If the motor is determined to be operating at a non-high temperature, it means that the motor temperature is not very high and there is no need for intensive cooling. In this case, it is possible to first determine whether the total power consumption of the motor and its cooling system has increased in the adjacent first time period, and then take corresponding cooling measures for the motor based on the determination result.

[0072] It should be noted that the first time period can be set according to the actual situation, and its specific value is not limited.

[0073] In some implementations...

[0074] The first time period can be denoted as t1. In this implementation, the total power consumption of the motor and cooling system can be calculated based on the temperature boundary of the cooling system and the operating conditions of the motor. After the calculation is completed, it is determined whether the total power consumption increases within adjacent t1 periods. The total power consumption of the motor and cooling system at a certain moment is denoted as P0, and the total power consumption after t1 periods is denoted as P... t1 The change in total power consumption within an adjacent t1 can be denoted as ΔP, where ΔP = P t1 -P0.

[0075] If ΔP > 0, it means that the total power consumption increases within the adjacent t1, indicating that the motor's request flow needs to be adjusted to reduce the total power consumption and put the system in a relatively low power consumption range.

[0076] If ΔP≤0, it means that the total power consumption has not increased within the adjacent t1. Therefore, it is considered that the total power consumption of the cooling system remains unchanged or decreases under the current flow supply, and the motor is in a low energy consumption state. Therefore, the requested flow of the motor does not need to be adjusted, and the process can be terminated directly.

[0077] In step S120, once the vehicle determines that the total power consumption has increased within an adjacent first time period, it indicates that the motor's request flow needs to be adjusted. In this case, the motor's requested flow rate can be adjusted based on the motor's set type temperature and a first temperature limit.

[0078] It should be noted that the first temperature limit can be set according to the actual situation, and its specific value is not limited. Generally, the first temperature limit can be lower than the second temperature limit.

[0079] In step S130, after the vehicle determines the adjusted requested flow rate, the flow supply of the cooling system can be adjusted based on the new requested flow rate.

[0080] The flow rate supply for different types of cooling pumps under different types of cooling media can be determined based on the adjusted requested flow rate, the type of cooling pump in the cooling system (which can be divided into mechanical pumps and electric pumps), and the type of cooling medium. In other words, if the cooling system includes multiple cooling media, the flow rate of each cooling medium can be allocated proportionally. The allocation ratio can be determined based on the cooling effect of the cooling medium and the structural design of the motor and cooling system. If the cooling system has more than one cooling pump, the flow rate request of each pump can also be allocated proportionally. The principle for determining the allocation ratio is to ensure the lowest motor temperature under the same total power consumption, or, to ensure the lowest total power consumption under the same motor temperature.

[0081] In this step, when the cooling system only has mechanical pumps, the adjusted requested flow rate can be used as the flow rate supply for the mechanical pumps. After allocating the flow rates for all mechanical pumps, the corresponding mechanical pump is controlled to supply its corresponding flow rate. When the cooling system only has electric pumps, the adjusted requested flow rate can be used as the flow rate supply for the electric pumps. After allocating the flow rates for all electric pumps, the corresponding electric pump is controlled to supply its corresponding flow rate. When the cooling system has both mechanical and electric pumps, the flow rate supply for the mechanical pumps can be obtained first, and then combined with the adjusted requested flow rate to determine the flow rate supply for the electric pumps.

[0082] In obtaining the flow rate of the mechanical pump, it is necessary to first obtain flow rate data under different medium temperatures, back pressures, and pump speeds through experiments, thereby establishing the correspondence between flow rate and medium temperature, back pressure, and pump speed (e.g., a flow rate map). Then, based on the real-time readings of the cooling medium temperature, back pressure, and pump speed, the corresponding flow rate is obtained from the flow rate map.

[0083] In this method, when controlling the cooling of the motor, the flow supply of the cooling system is determined by comprehensively judging the total power consumption of the motor and its cooling system and the set temperature of the motor. This ensures the timeliness of the motor cooling control and minimizes the total power consumption of the motor and its cooling system while ensuring that the motor does not overheat.

[0084] This embodiment provides a motor cooling control method applicable to vehicles. In this method, the requested flow rate of the motor is adjusted according to the motor's set type temperature and a first temperature limit, and may include at least one of the following methods:

[0085] Method 1: If it is determined that the set type temperature is less than or equal to the first temperature limit, the motor's request flow rate is adjusted according to the change in total power consumption within the adjacent first time period.

[0086] Method 2: If it is determined that the set type temperature is greater than the first temperature limit, the motor's requested flow rate is adjusted according to the change of the set type temperature in the adjacent second time period.

[0087] In Method 1, if it is determined that the rate of change of total power consumption within an adjacent first time period is less than the rate of change threshold, then the product of the first set coefficient and the preset flow rate change is determined as the first flow rate change. Then, the requested flow rate of the motor is reduced by the first flow rate change.

[0088] If it is determined that the rate of change of total power consumption within an adjacent first time period is greater than or equal to the rate of change threshold, then the sum of the first set coefficient and the second set coefficient is determined as the adjustment coefficient for the preset flow rate change. Then, the product of the adjustment coefficient and the preset flow rate change is determined as the second flow rate change. Finally, the motor's requested flow rate is reduced by the second flow rate change.

[0089] In Method 2, if it is determined that the temperature change value of the set type temperature is less than the third temperature limit within the adjacent second time period, the motor's requested flow rate is reduced according to the first setting rule.

[0090] Specifically, the product of the third set coefficient and the preset flow rate change is determined as the third flow rate change. Then, the motor's requested flow rate is gradually reduced using the third flow rate change until the total power consumption no longer increases within the adjacent first time period.

[0091] If the temperature change value is determined to be greater than or equal to the third temperature limit but less than the fourth temperature limit, the requested flow rate of the motor is increased according to the second set rule.

[0092] Specifically, the product of the fourth set coefficient and the preset flow rate change is determined as the fourth flow rate change. Then, the motor's requested flow rate is gradually increased using the fourth flow rate change until the total power consumption no longer increases within the adjacent first time period.

[0093] If the temperature change value is determined to be greater than or equal to the fourth temperature limit, the motor's requested flow rate will be adjusted to the preset requested flow rate.

[0094] It should be noted that the aforementioned change rate threshold, preset flow rate change, first setting coefficient, second setting coefficient, third setting coefficient, fourth setting coefficient, second time period, third temperature limit, and fourth temperature limit can be set according to experience and actual conditions, and their specific values ​​are not limited.

[0095] This method allows for real-time adjustment of the motor's requested flow rate based on its actual operating conditions, ensuring timely and precise control. It also enables reliable pre-cooling of the motor even at high heating rates, extending the duration of high-temperature operation and providing better overheat protection. This method guarantees timely motor cooling control while minimizing the overall power consumption of the motor and its cooling system, preventing overheating.

[0096] This embodiment provides a motor cooling control method applicable to vehicles. In this method, a set type temperature T of the motor is first obtained; then, it is determined whether the set type temperature T exceeds a second temperature limit T2.

[0097] If the set temperature T exceeds the second temperature limit T2, the motor is considered to be operating in a high-temperature zone, meaning it is in a high-temperature operating state and requires a larger cooling flow rate. Therefore, the motor's requested flow rate can be adjusted to the preset requested flow rate, which can be the maximum requested flow rate.

[0098] If it is determined that the set temperature T does not exceed the second temperature limit T2, then it is determined whether the total power consumption of the motor and its cooling system increases within the adjacent first time period t1.

[0099] The total power consumption of the motor and cooling system can be calculated based on the temperature limits of the cooling system and the operating conditions of the motor. The formula for calculating the total power consumption is as follows:

[0100] P 总功耗 =P 电子泵功耗 +P 机械泵功耗 +P 电机功耗 ;

[0101] Among them, P 总功耗 P represents the total power consumption of the motor and cooling system (unit: kW). 电子泵功耗 P represents the power consumption of the electronic pump (unit: kW). 机械泵功耗 P represents the power consumption of a mechanical pump (unit: kW). 电机功耗 Total power consumption of the motor and motor controller (unit: kW).

[0102] The power consumption calculation formula for the electronic pump is as follows:

[0103] P 电子泵损耗 =UI / 1000

[0104] In the formula: U is the voltage of the electronic pump (unit: V), and I is the current of the electronic pump (unit: A).

[0105] The formula for calculating the power consumption of the motor is as follows:

[0106] For drive conditions

[0107] For power generation conditions

[0108] In the formula: U 母线 I is the DC bus voltage. 母线 For DC bus current, η 控制器 For the efficiency of the motor controller, η 电机 This refers to the efficiency of the motor.

[0109] In determining the power consumption of the mechanical pump, a power consumption map of the mechanical pump is formulated based on the actual power consumption test results under different boundary conditions in the early stage. When calculating the power consumption of the mechanical pump in real time, the corresponding power consumption is obtained based on the three-dimensional difference between the cooling medium temperature, back pressure and the speed of the mechanical pump.

[0110] In this method, the total power consumption of the motor and cooling system at a certain moment can be denoted as P0, and the total power consumption after the first time period t1 can be denoted as P. t1 Then, the total power consumption change ΔP = P within the adjacent first time period t1 t1 -P0.

[0111] When ΔP≤0, no adjustment is made to the requested flow rate of the motor, and the process ends directly. When ΔP>0, it is further determined whether the motor set type temperature T exceeds the first temperature limit T1.

[0112] It should be noted that the selection of the first temperature limit T1 needs to take into account the cumulative power consumption E of the motor under common operating conditions (WLTC, CLTC, etc.) under the motor cooling control method. 累积 :

[0113]

[0114] An initial value T of a temperature limit can be preset in the early stage. 1_0 Under the action of the motor cooling control method, the cumulative power consumption E under common operating conditions is obtained. 累积_0 By increasing and decreasing the temperature limit value by equal step size, the cumulative power consumption of the motor under common operating conditions is obtained when the temperature limit value is different. The temperature limit value with the minimum cumulative power consumption is taken as the first temperature limit value T1.

[0115] In this method, if the set type temperature T does not exceed the first temperature limit T1, the motor temperature is considered to be low, and the request flow is adjusted according to the change in total power consumption within the adjacent first time period t1.

[0116] Among them, a change rate threshold a% can be preset in the vehicle. When If the increase in total power consumption in the adjacent first time period t1 is considered small, then a small reduction in flow rate can be used to reduce the total power consumption. The minimum preset flow rate change in the vehicle is Q0, that is, the preset flow rate change in the vehicle is Q0. In this case, the first flow rate change that can be reduced is Q1 = x1 * Q0, where the first set coefficient x1 is an integer greater than or equal to 1.

[0117] when If the total power consumption increases significantly in the adjacent first time period t1, then a larger reduction in flow rate can be achieved to reduce the total power consumption. In this case, the second flow rate reduction amount Q2 = (x1 + x2) * Q0, where the second set coefficient x2 is an integer greater than or equal to 1.

[0118] It should be noted that in some implementations, a = 10, x1 = 1, and x2 = 1 in the above parameters.

[0119] If the set type temperature T exceeds the first temperature limit T1, the motor temperature is considered to be too high. Then, the temperature change value ΔT of the set type temperature T within the adjacent second time period t2 is determined, and the magnitude of the temperature change value ΔT is judged.

[0120] If the temperature change ΔT is less than the third temperature limit T3, the requested flow rate of the motor is reduced. For ease of control, the requested flow rate can be gradually reduced until the total power consumption no longer increases within the adjacent first time period t1. The specific step size can be denoted as the third flow rate change Q3 = x3 * Q0, where the third setting coefficient x3 is an integer greater than or equal to 1 (e.g., x3 = 1).

[0121] If the temperature change ΔT is greater than or equal to the third temperature limit T3 and less than the fourth temperature limit T4, then the requested flow rate of the motor is increased. For ease of control, the requested flow rate can be gradually increased until the total power consumption no longer increases within the adjacent first time period t1. The specific step size can be denoted as the fourth flow rate change Q4 = x4 * Q0, where the fourth setting coefficient x4 is an integer greater than or equal to 1 (e.g., x4 = 1).

[0122] If the temperature change ΔT is greater than or equal to the fourth temperature limit T4, the motor's requested flow rate can be adjusted to the maximum requested flow rate. If the cooling system includes multiple cooling media, each cooling media requests the maximum cooling flow rate.

[0123] It should be noted that the set type temperature T of the motor can be a temperature value for different types of motors. It can be the average or maximum motor temperature calculated based on the temperature boundaries of the cooling system and the motor's operating conditions, or it can be the motor temperature detected by a preset temperature sensor. The corresponding first, second, third, and fourth temperature limits can be different for different types of temperature values.

[0124] In this method, after determining the adjusted request flow rate, it can be further determined whether the cooling system includes both mechanical and electronic pumps.

[0125] If the cooling system is determined to include both an electric pump and a mechanical pump, the flow rate of the mechanical pump should first be obtained based on parameters such as its rotational speed. To obtain the mechanical pump flow rate, it is necessary to first obtain a flow rate map of the mechanical pump under different medium temperatures, back pressures, and rotational speeds through experiments. During the motor cooling control process, the corresponding mechanical pump flow rate can be determined based on the medium temperature, back pressure, mechanical pump rotational speed, and the aforementioned flow rate map.

[0126] In some implementations, such as Figure 2 As shown, when the cooling system has only one type of cooling medium, motor 2 can be an oil-cooled motor. In this embodiment, only one cooling medium storage chamber 1 is needed. To obtain the flow rate of mechanical pump 4, it is necessary to read the temperature, back pressure, and rotational speed of the cooling medium in real time, and perform three-dimensional interpolation based on the previously obtained mechanical pump flow rate map to obtain the mechanical pump request flow rate Q of mechanical pump 4. mach Combined with the adjusted request traffic Q all Obtain the requested flow rate Q of electronic pump 3. ele =Q all -Q mach .

[0127] In some implementations, such as Figure 3 As shown, when the cooling system has two cooling media (a first cooling media and a second cooling media), two cooling media storage chambers are required: a first storage chamber 11 for the first cooling media and a second storage chamber 12 for the second cooling media. If there is only one cooling pump (electronic pump 3 or mechanical pump 4) in each cooling media circuit, it is necessary to read the temperature and back pressure of the cooling media and the rotational speed of the mechanical pump 4 in real time, and perform three-dimensional interpolation based on the previously obtained mechanical pump flow map to obtain the mechanical pump request flow Q of the mechanical pump 4. mach Combined with the adjusted request traffic Q all The requested flow rate Q of electronic pump 3 can be obtained. ele =Q all -Q mach .

[0128] In some implementations, such as Figure 4 As shown, when the cooling system of motor 2 has two cooling media (a first cooling media and a second cooling media), two cooling media storage chambers are required: a first storage chamber 11 for the first cooling media and a second storage chamber 12 for the second cooling media. If each cooling media circuit has one electronic pump and one mechanical pump, it is necessary to read the temperature and back pressure of the cooling media and the rotational speeds of the first mechanical pump 41 and the second mechanical pump 42 in real time. Combined with the previously obtained mechanical pump flow map, three-dimensional interpolation is performed to obtain the first mechanical pump request flow Q of the first mechanical pump 41. mach_a The second mechanical pump 42 requests a flow rate Q. mach_b Combined with the adjusted request traffic Q all The total flow rate requirement Q of the first and second cooling medium circuits is obtained according to a certain ratio. all_a Q all_b Q all =Q all_a +Q all_b The aforementioned ratio can be 1:1. Then, the requested flow rate Q of the first electronic pump 31 can be determined. ele_a =Q all_a -Q mach_a And the second electronic pump request flow rate Q of the second electronic pump 32 can be determined. ele_b =Q all_b -Q mach_b .

[0129] In this method, when the cooling system only has an electric pump, the requested flow rate can be allocated based on the type of cooling medium.

[0130] In some implementations, such as Figure 5 As shown, if there is only one type of cooling medium in the cooling system, the cooling system can be equipped with a storage chamber 1 for the cooling medium. The motor 2 can be an oil-cooled motor. In this embodiment, the adjusted requested flow rate can be used as the electronic pump requested flow rate of the electronic pump 3.

[0131] In some implementations, such as Figure 6 As shown, if the cooling system of motor 2 has two cooling media, each cooling media is equipped with an electronic pump and a storage chamber. The storage chamber corresponding to the first cooling medium is denoted as first storage chamber 11, the electronic pump corresponding to the first cooling medium is denoted as first electronic pump 31, the storage chamber corresponding to the second cooling medium is denoted as second storage chamber 12, and the electronic pump corresponding to the second cooling medium is denoted as second electronic pump 32. In this embodiment, combined with the adjusted requested flow rate Q... all The total flow rate requirement Q of the first and second cooling medium circuits is obtained according to a certain ratio. all_a Qall_b Q all =Q all_a +Q all_b The aforementioned ratio can be 1:1. Then, the requested flow rate Q of the first electronic pump 31 can be determined. ele_a =Q all_a And the second electronic pump 32's requested flow rate Q can be determined. ele_b =Q all_b .

[0132] In this method, when the cooling system only has a mechanical pump, the requested flow rate can be allocated based on the type of cooling medium. It should be noted that, normally, the motor's operating conditions are fixed, and the mechanical pump's speed is also fixed. Without a cooling medium flow control valve, the system flow rate is also fixed. However, to regulate the flow rate, a flow control valve and a pressure relief valve are added to the cooling medium's flow path to control the mechanical pump's flow rate. In this case, the requested flow rate for the mechanical pump becomes a request for the opening degree of the flow control valve.

[0133] In some implementations, such as Figure 7 As shown, if there is only one type of cooling medium in the cooling system, the cooling system can be equipped with a storage chamber 1 for the cooling medium. The motor 2 can be an oil-cooled motor. In this embodiment, the adjusted requested flow rate can be used as the mechanical pump requested flow rate of the mechanical pump 4.

[0134] In some implementations, such as Figure 8 As shown, if there are two cooling media in the cooling system, each with a mechanical pump, the storage chamber corresponding to the first cooling medium is designated as first storage chamber 11, the mechanical pump corresponding to the first cooling medium is designated as first mechanical pump 41, the storage chamber corresponding to the second cooling medium is designated as second storage chamber 12, and the mechanical pump corresponding to the second cooling medium is designated as second mechanical pump 42. In this embodiment, the adjusted requested flow rate Q is considered. all The total flow rate requirement Q of the first and second cooling medium circuits is obtained according to a certain ratio. all_a Q all_b Q all =Q all_a +Q all_b The aforementioned ratio can be 1:1. Then, the requested flow rate Q of the first mechanical pump 41 can be determined. mach_a =Q all_a And the second mechanical pump 42 can be used to determine the second mechanical pump's requested flow rate Q. mach_b =Q all_b .

[0135] In this method, after determining the requested flow rate of each cooling pump, the flow supply to the corresponding cooling pump can be controlled based on the requested flow rate, and then the process ends. In other words, after determining the requested flow rate of each electronic pump, the flow supply to the corresponding electronic pump can be controlled based on the requested flow rate; similarly, after determining the requested flow rate of each mechanical pump, the flow supply to the corresponding mechanical pump can be controlled based on the requested flow rate. The flow control of the mechanical pumps is achieved through a flow control valve and a pressure relief valve, and the requested flow rate of the mechanical pump is further converted into an opening request for the flow control valve.

[0136] This method adjusts the motor's requested flow rate in real time based on the motor's actual operating conditions, ensuring timely and high-precision control. It adjusts the motor's requested flow rate to match the flow rate at which the total power consumption of the motor and its cooling system is relatively lower. This method can preemptively cool the motor when it experiences high temperature rise, increasing the duration of high-temperature operation and providing better overheat protection. Furthermore, this method considers the coexistence of electronic and mechanical pumps, providing a framework for diverse cooling system layouts. When multiple cooling media, multiple pumps, or multiple pumps are used in the system, this method can also obtain the requested flow rate corresponding to lower total power consumption. In short, this method ensures both the timeliness of motor cooling control and minimizes the total power consumption of the motor and its cooling system while preventing the motor from overheating.

[0137] This embodiment provides a motor cooling control device applicable to vehicles. This device can be used to implement a motor cooling control method for climbing trees. For example, refer to... Figure 9 As shown, the device may include a determining module 10 and an adjusting module 20, wherein, during the implementation of the above method,

[0138] The determination module 10 is used to determine whether the total power consumption of the motor and its cooling system increases within an adjacent first time period when the motor is in a set state.

[0139] The adjustment module 20 is used to adjust the motor's requested flow rate according to the motor's set type temperature and the first temperature limit if it is determined that the total power consumption increases within an adjacent first time period.

[0140] The adjustment module 20 is also used to adjust the flow supply of the cooling system based on the adjusted request flow.

[0141] This embodiment provides a motor cooling control device that can be applied to vehicles. (Reference) Figure 9 As shown, in this device, the adjustment module 20 can be used for:

[0142] If the set temperature is determined to be less than or equal to the first temperature limit, then the motor's requested flow rate is adjusted based on the change in total power consumption within adjacent first time periods; and / or,

[0143] If it is determined that the set type temperature is greater than the first temperature limit, the requested flow rate of the motor is adjusted according to the change of the set type temperature in the adjacent second time period.

[0144] This embodiment provides a motor cooling control device that can be applied to vehicles. (Reference) Figure 9 As shown, in this device, the adjustment module 20 can be used for:

[0145] If it is determined that the rate of change of total power consumption within the adjacent first time period is less than the rate of change threshold, then the product of the first set coefficient and the preset flow rate change is determined as the first flow rate change.

[0146] Reduce the motor's requested flow rate by the first flow rate change.

[0147] This embodiment provides a motor cooling control device that can be applied to vehicles. (Reference) Figure 9 As shown, in this device, the adjustment module 20 can be used for:

[0148] If it is determined that the rate of change of total power consumption within an adjacent first time period is greater than or equal to the rate of change threshold, then the sum of the first set coefficient and the second set coefficient is determined as the adjustment coefficient for the preset flow rate change.

[0149] The product of the adjustment coefficient and the preset flow rate change is determined as the second flow rate change.

[0150] Reduce the motor's requested flow rate by the second flow rate change.

[0151] This embodiment provides a motor cooling control device that can be applied to vehicles. (Reference) Figure 9 As shown, in this device, the adjustment module 20 can be used for:

[0152] If it is determined that the temperature change value of the set type temperature within the adjacent second time period is less than the third temperature limit, the requested flow rate of the motor is reduced according to the first setting rule; and / or,

[0153] If the temperature change is determined to be greater than or equal to the third temperature limit but less than the fourth temperature limit, the requested flow rate of the motor is increased according to the second set rule; and / or,

[0154] If the temperature change value is determined to be greater than or equal to the fourth temperature limit, the motor's requested flow rate will be adjusted to the preset requested flow rate.

[0155] This embodiment provides a motor cooling control device that can be applied to vehicles. (Reference) Figure 9As shown, in this device, the adjustment module 20 can be used for:

[0156] The product of the third set coefficient and the preset flow rate change is determined as the third flow rate change.

[0157] The motor's requested flow rate is gradually reduced using the third flow rate change until the total power consumption no longer increases within the adjacent first time period.

[0158] This embodiment provides a motor cooling control device that can be applied to vehicles. (Reference) Figure 9 As shown, in this device, the adjustment module 20 can be used for:

[0159] The product of the fourth set coefficient and the preset flow rate change is determined as the fourth flow rate change.

[0160] The motor's requested flow rate is gradually increased using the fourth flow rate change until the total power consumption no longer increases within the adjacent first time period.

[0161] This embodiment provides a motor cooling control device that can be applied to vehicles. (Reference) Figure 9 As shown, in this device, the adjustment module 20 can be used for:

[0162] If it is determined that the motor is not in a non-high temperature operating state, the motor's requested flow rate is adjusted to the preset requested flow rate.

[0163] This embodiment provides a motor cooling control device that can be applied to vehicles. (Reference) Figure 9 As shown, in this device, the determining module 10 can be used for:

[0164] Determine whether the set type temperature is less than or equal to the second temperature limit.

[0165] This embodiment provides a motor cooling control device that can be applied to vehicles. (Reference) Figure 9 As shown, in this device, the adjustment module 20 can be used for:

[0166] Based on the adjusted requested flow rate, as well as the type of cooling pump and the type of cooling medium in the cooling system, determine the corresponding flow rate supply for different types of cooling pumps under different types of cooling media.

[0167] This embodiment provides a control system based on the above-described motor cooling control method, which may include multiple computing modules programmed to execute the above-described method.

[0168] The control system can be divided into the following modules: motor temperature calculation module, motor efficiency calculation module, power consumption calculation module, and motor cooling control module. Each module is designed to perform the tasks mentioned in the motor cooling control method and is programmed to complete the overall system program.

[0169] Motor temperature calculation module: When calculating motor efficiency, the average temperature of the motor is required, so this module needs to complete the calculation and obtain the average temperature of the motor. At the same time, if the motor cooling control method uses the average temperature or the maximum temperature of the motor as the set type temperature, this calculation module needs to calculate the average temperature or the maximum temperature of the motor.

[0170] Motor efficiency calculation module: The main function of this module is to interpolate the motor efficiency under the average temperature condition based on the previously calculated motor average temperature and the existing motor efficiency map. This module is required to provide as much detailed motor efficiency map data as possible to improve the accuracy of the motor efficiency values.

[0171] Power Consumption Calculation Module: Power consumption calculation is crucial in motor cooling control, influencing the decision-making direction for flow regulation throughout the entire method. Specifically, it includes power consumption calculations for electronic pumps, mechanical pumps, and motors.

[0172] Motor cooling control module: This module includes all the components of the above-mentioned motor cooling control method except for the calculation modules mentioned above.

[0173] After integrating and programming all modules, the control program corresponding to the above motor cooling control method is obtained. Finally, it is written into the controller to complete the control system that can execute the above motor cooling control method.

[0174] This embodiment provides a vehicle. The vehicle can be a pure electric vehicle, a hybrid electric vehicle, or other vehicles that include an electric motor; there is no limitation on the type.

[0175] refer to Figure 10 As shown, the vehicle 100 includes at least one processor 101, a memory 102, at least one network interface 104, and other user interfaces 103. The various components in the vehicle 100 are coupled together via a bus system 105. It is understood that the bus system 105 is used to enable communication between these components. In addition to a data bus, the bus system 105 also includes a power bus, a control bus, and a status signal bus. However, for clarity, all buses are referred to as bus system 105.

[0176] The user interface 103 may include a display, keyboard, or click vehicle (e.g., mouse, trackball, touchpad, or touchscreen).

[0177] It is understood that the memory 102 in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 102 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0178] In some implementations, memory 102 stores elements, executable units or data structures, or subsets thereof, or extended sets thereof: operating system 1021 and application program 1022.

[0179] The operating system 1021 includes various system programs, such as a framework layer, a core library layer, and a driver layer, used to implement various basic business functions and handle hardware-based tasks. The application program 1022 includes various applications, such as a media player and a browser, used to implement various application functions. Programs implementing the methods of this application embodiment can be included in the application program 1022.

[0180] In this embodiment of the application, the processor 101 executes the methods provided in each method embodiment by calling the program or instructions stored in the memory 102, specifically the program or instructions stored in the application program 1022.

[0181] The methods disclosed in the embodiments of this application can be applied to or implemented by the processor 101. The processor 101 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware or by instructions in the form of software in the processor 101. The processor 101 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software units in the decoding processor. The software units may be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 102. Processor 101 reads the information in memory 102 and performs the above method in conjunction with its hardware.

[0182] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing vehicles (DSPDs), programmable logic vehicles (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0183] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0184] This application also provides a storage medium (computer-readable storage medium). This storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; it may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; and it may also include combinations of the above types of memory.

[0185] When one or more programs in the storage medium can be executed by one or more processors to implement the above-described method of execution in the vehicle.

[0186] The processor is used to execute the vehicle control program stored in the memory to implement the above-described method of execution in the vehicle.

[0187] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0188] It should be noted that the terms "one implementation," "embodiment," "exemplary embodiment," and "some embodiments" used in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0189] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or vehicle that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or vehicle. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or vehicle that includes said element.

[0190] The above embodiments are merely preferred embodiments provided to fully illustrate this application, and the scope of protection of this application is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on this application are all within the scope of protection of this application.

Claims

1. A method for controlling motor cooling, characterized in that, The motor cooling control method includes: Once it is determined that the motor is operating at a non-high temperature, it is determined whether the total power consumption of the motor and its cooling system increases within an adjacent first time period; wherein, the total power consumption is the sum of the power consumption of the electronic pump, the power consumption of the mechanical pump, and the power consumption of the motor; If it is determined that the total power consumption increases within an adjacent first time period, the requested flow rate of the motor is adjusted according to the set type temperature of the motor and the first temperature limit. Adjust the flow supply of the cooling system according to the adjusted request flow; The step of adjusting the requested flow rate of the motor according to the set type temperature and the first temperature limit of the motor includes: If it is determined that the set type temperature is less than or equal to the first temperature limit, then the motor's request flow rate is adjusted according to the change in the total power consumption within the adjacent first time period. The step of adjusting the motor's request flow based on the change in total power consumption within adjacent first time periods includes: If it is determined that the rate of change of total power consumption within adjacent first time periods is less than the rate of change threshold, then the product of the first set coefficient and the preset flow rate change is determined as the first flow rate change. Reduce the requested flow rate of the motor by the first flow rate change; The step of adjusting the motor's request flow based on the change in total power consumption within adjacent first time periods includes: If it is determined that the rate of change of total power consumption within adjacent first time periods is greater than or equal to the rate of change threshold, then the sum of the first set coefficient and the second set coefficient is determined as the adjustment coefficient for the preset flow rate change. The product of the adjustment coefficient and the preset flow rate change is determined as the second flow rate change. Reduce the requested flow rate of the motor by the second flow rate change.

2. The motor cooling control method according to claim 1, characterized in that, The step of adjusting the requested flow rate of the motor according to the set type temperature and the first temperature limit of the motor includes: If it is determined that the set type temperature is greater than the first temperature limit, the requested flow rate of the motor is adjusted according to the change of the set type temperature in the adjacent second time period.

3. The motor cooling control method according to claim 2, characterized in that, The step of adjusting the motor's requested flow rate based on the temperature changes of the set type within adjacent second time periods includes: If it is determined that the temperature change value of the set type temperature within an adjacent second time period is less than the third temperature limit, the requested flow rate of the motor is reduced according to the first set rule; and / or, If the temperature change value is determined to be greater than or equal to the third temperature limit and less than the fourth temperature limit, the requested flow rate of the motor is increased according to the second set rule; and / or, If the temperature change value is determined to be greater than or equal to the fourth temperature limit, the requested flow rate of the motor is adjusted to the preset requested flow rate.

4. The motor cooling control method according to claim 3, characterized in that, The step of reducing the requested flow of the motor according to the first preset rule includes: The product of the third set coefficient and the preset flow rate change is determined as the third flow rate change. The motor's requested flow rate is gradually reduced by the third flow rate change until the total power consumption no longer increases within the adjacent first time period.

5. The motor cooling control method according to claim 3, characterized in that, The step of increasing the request flow of the motor according to the second set rule includes: The product of the fourth set coefficient and the preset flow rate change is determined as the fourth flow rate change. The requested flow rate of the motor is gradually increased by the fourth flow rate change until the total power consumption no longer increases within the adjacent first time period.

6. The motor cooling control method according to any one of claims 1-5, characterized in that, The motor cooling control method includes: If it is determined that the motor is not in the non-high temperature operating state, the requested flow rate of the motor is adjusted to the preset requested flow rate.

7. The motor cooling control method according to any one of claims 1-5, characterized in that, The determination that the motor is in a non-high-temperature operating state includes: The set temperature is determined to be less than or equal to the second temperature limit.

8. The motor cooling control method according to any one of claims 1-5, characterized in that, The step of adjusting the flow supply of the cooling system according to the adjusted request flow includes: Based on the adjusted requested flow rate, as well as the type of cooling pump and the type of cooling medium in the cooling system, the flow rate supply corresponding to different types of cooling pumps under different types of cooling media is determined.

9. A motor cooling control device, characterized in that, The motor cooling control device is used to implement the motor cooling control method as described in any one of claims 1-8, and the motor cooling control device includes: The determination module is used to determine whether the total power consumption of the motor and its cooling system increases within an adjacent first time period when the motor is in a set state. An adjustment module is used to adjust the motor's request flow rate according to the motor's set type temperature and a first temperature limit if it is determined that the total power consumption increases within an adjacent first time period. The adjustment module is also used to adjust the flow supply of the cooling system according to the adjusted request flow.

10. A vehicle, characterized in that, include: A processor and a memory, the processor being configured to execute a control program stored in the memory to implement the motor cooling control method according to any one of claims 1-8.

11. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the motor cooling control method according to any one of claims 1-8.

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