Torque distribution method for a vehicle, device therefor, vehicle and storage medium

Abstract

The application discloses a torque distribution method and device of a vehicle, the vehicle and a storage medium. The method comprises the following steps: determining whether the vehicle has a high-power driving demand and whether the vehicle has a charging demand according to vehicle state information; if the vehicle has a high-power driving demand and / or the vehicle has a charging demand, determining whether the heat provided by a heat management system meets the heating demand of the vehicle corresponding to the high-power driving demand and / or the charging demand; if the heat provided by the heat management system cannot meet the heating demand of the vehicle, controlling the vehicle to distribute the torque of each driving motor according to a second torque distribution mode to meet the heating demand of the vehicle. When the vehicle is in the second torque distribution mode, the efficiency of the electric drive system is lower than a preset threshold. In the application, when the vehicle is in a specific scene, if the heat provided by the heat management system cannot meet the heating demand of the vehicle, the torque of the driving motor is distributed according to the second torque distribution mode to meet the heating demand of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to a torque distribution method and apparatus for a vehicle, as well as a vehicle and a storage medium. Background Technology

[0002] Current torque distribution methods for the front and rear drive systems of some four-wheel drive electric vehicles typically prioritize the vehicle's overall battery consumption. However, such torque distribution methods lack consideration for certain specific scenarios. For example, when the vehicle's battery is at low temperatures, its discharge and charging capabilities are limited. If the user has a prolonged need for high power in the current road conditions or has future charging needs, it is necessary to quickly raise the battery temperature to meet the vehicle's heating requirements, thereby releasing the battery's charging and discharging performance.

[0003] However, considering the overall vehicle's power consumption, for the specific scenarios mentioned above, an efficient allocation ratio coefficient will be obtained for the front and rear drive systems. This coefficient can be used to obtain a target torque for an efficient motor. However, this cannot quickly raise the battery temperature and cannot meet the vehicle's heating requirements, resulting in a poor user experience. Summary of the Invention

[0004] The present invention provides a torque distribution method and apparatus for a vehicle, a vehicle, and a storage medium.

[0005] This invention provides a torque distribution method for a vehicle. The vehicle includes a thermal management system and an electric drive system, the electric drive system including multiple drive motors. The torque distribution method includes: acquiring vehicle status information; determining, based on the vehicle status information, whether the vehicle has a high-power drive requirement and a charging requirement, wherein the high-power drive requirement indicates that the output power of the electric drive system exceeds a preset power threshold; if the vehicle has the high-power drive requirement and / or the vehicle has a charging requirement, determining whether the heat provided by the thermal management system meets the heating requirement of the vehicle corresponding to the high-power drive requirement and / or the charging requirement; if the heat provided by the thermal management system meets the heating requirement of the vehicle, controlling the vehicle to distribute the torque of each drive motor according to a first torque distribution mode; wherein, when the vehicle is in the first torque distribution mode, the efficiency of the electric drive system is higher than a first preset threshold; if the heat provided by the thermal management system cannot meet the heating requirement of the vehicle, controlling the vehicle to distribute the torque of each drive motor according to a second torque distribution mode to meet the heating requirement of the vehicle; wherein, when the vehicle is in the second torque distribution mode, the efficiency of the electric drive system is lower than a second preset threshold.

[0006] The torque distribution method includes: if the vehicle does not have the high-power drive requirement and / or the charging requirement, controlling the vehicle to distribute the torque of each drive motor according to a first torque distribution mode.

[0007] If the vehicle does not have the high-power drive requirement and / or the charging requirement, controlling the vehicle to allocate the torque of each drive motor according to the first torque allocation mode includes: obtaining the total drive torque required by the driver under preset operating conditions; determining the allocation ratio coefficient of the first torque allocation mode based on the total drive torque required by the driver and the power consumption; and calculating the first target torque of each drive motor under the first torque allocation mode based on the allocation ratio coefficient of the first torque allocation mode and the total drive torque required by the driver.

[0008] If the heat provided by the thermal management system cannot meet the heating requirements of the vehicle, controlling the vehicle to distribute the torque of each drive motor according to the second torque distribution mode to meet the heating requirements of the vehicle includes: obtaining the rotational speed of each drive motor under a preset operating condition; calculating the efficiency of each drive motor under the first torque distribution mode based on the rotational speed and the first target torque; calculating the first heating power of the drive motor under the first torque distribution mode based on the efficiency of each drive motor, the rotational speed of the drive motor, and the first target torque of the drive motor; determining the compensation heating power of the drive motor based on the heating requirements of the vehicle; adding the first heating power and the compensation heating power to obtain the target heating power of the drive motor under the second torque distribution mode; and calculating the torque of each drive motor under the second torque distribution mode based on the target heating power.

[0009] The torque distribution method includes: if the heat provided by the thermal management system cannot meet the heating requirements of the vehicle, and the vehicle distributes the torque of each drive motor according to the second torque distribution mode, but this also fails to meet the heating requirements of the vehicle, then the distribution coefficient of the second torque distribution mode is calculated based on the maximum heat generation power of the electric drive system.

[0010] The vehicle includes a battery, and the vehicle status information includes battery charge, battery temperature, and battery charging / discharging power. Obtaining the vehicle status information includes obtaining the battery charge, battery temperature, and battery charging / discharging power. Determining whether the vehicle has a high-power drive requirement based on the vehicle status information includes determining whether the vehicle has a high-power drive requirement if the battery charge is higher than a first threshold, the battery temperature is lower than a second threshold, and the battery charging / discharging power is lower than a third threshold.

[0011] The vehicle includes a battery. The step of determining whether the heat provided by the thermal management system meets the heating requirements of the vehicle corresponding to the high-power drive requirements or the charging requirements includes: real-time detection of the first heat provided by the thermal management system at the current moment, and calculation of the second heat required by the battery at the current moment; if the first heat is lower than the second heat, it is determined that the heat provided by the thermal management system cannot meet the heating requirements of the vehicle.

[0012] The present invention also provides a torque distribution device for a vehicle. The vehicle includes a thermal management system and an electric drive system, the electric drive system including multiple drive motors, and the torque distribution device including: an acquisition module, a first judgment module, a second judgment module, and a control module. The acquisition module is used to acquire vehicle status information; the first judgment module is used to determine whether the vehicle has a high-power drive requirement and a charging requirement based on the vehicle status information, wherein the high-power drive requirement indicates that the output power of the electric drive system exceeds a preset power threshold; the second judgment module is used to determine whether the heat provided by the thermal management system meets the heating requirements of the vehicle corresponding to the high-power drive requirement and / or the charging requirement if the vehicle has the high-power drive requirement and / or the charging requirement; the control module is used to control the vehicle to allocate the torque of each drive motor according to a first torque distribution mode if the heat provided by the thermal management system meets the heating requirements of the vehicle; wherein, when the vehicle is in the first torque distribution mode, the efficiency of the electric drive system is higher than a first preset threshold; if the heat provided by the thermal management system cannot meet the heating requirements of the vehicle, the control module is used to control the vehicle to allocate the torque of each drive motor according to a second torque distribution mode to meet the heating requirements of the vehicle; wherein, when the vehicle is in the second torque distribution mode, the efficiency of the electric drive system is lower than a second preset threshold.

[0013] This application also provides a vehicle. The vehicle includes the torque distribution device described in the above embodiments.

[0014] The present invention also provides a non-volatile computer-readable storage medium containing a computer program. When the computer program is executed by one or more processors, it implements the torque distribution method for a vehicle as described in any of the above embodiments.

[0015] Thus, in the torque distribution method of the present invention, if the heat provided by the thermal management system cannot meet the heating needs of the vehicle when the vehicle is in a specific scenario, the vehicle is controlled to distribute the torque of each drive motor according to the second torque distribution mode, thereby meeting the heating needs of the vehicle and the user's usage needs, and improving the user experience.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0018] Figure 1 This is one of the flowcharts illustrating the torque distribution method for vehicles according to the present invention;

[0019] Figure 2 This is one of the structural schematic diagrams of the torque distribution device for a vehicle according to the present invention;

[0020] Figure 3 This is a second schematic flowchart of the torque distribution method for vehicles according to the present invention;

[0021] Figure 4 This is the third flowchart illustrating the torque distribution method for vehicles according to the present invention;

[0022] Figure 5 This is the fourth flowchart illustrating the torque distribution method for vehicles according to the present invention;

[0023] Figure 6 This is a schematic diagram of the overall process of the torque distribution method for vehicles according to the present invention. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present invention, and should not be construed as limiting the embodiments of the present invention.

[0025] Please see Figure 1 This invention provides a torque distribution method for a vehicle. The vehicle includes a thermal management system and an electric drive system, the electric drive system including multiple drive motors. The torque distribution method for this vehicle includes:

[0026] 01: Obtain vehicle status information;

[0027] 02: Determine whether the vehicle has a high-power drive requirement and a charging requirement based on the vehicle status information. A high-power drive requirement indicates that the output power of the electric drive system exceeds the preset power threshold.

[0028] 03: If the vehicle has a high power drive requirement and / or a charging requirement, determine whether the heat provided by the thermal management system meets the heating requirements of the vehicle corresponding to the high power drive requirement and / or charging requirement.

[0029] 04: If the heat provided by the thermal management system meets the vehicle's heating requirements, the vehicle is controlled to distribute the torque of each drive motor according to the first torque distribution mode; wherein, when the vehicle is in the first torque distribution mode, the efficiency of the electric drive system is higher than the first preset threshold; if the heat provided by the thermal management system cannot meet the vehicle's heating requirements, the vehicle is controlled to distribute the torque of each drive motor according to the second torque distribution mode to meet the vehicle's heating requirements; wherein, when the vehicle is in the second torque distribution mode, the efficiency of the electric drive system is lower than the second preset threshold.

[0030] Please see Figure 2 The present invention also provides a torque distribution device 10 for a vehicle. The torque distribution device 10 includes an acquisition module 11, a first judgment module 12, a second judgment module 13, and a control module 14.

[0031] Step 01 can be implemented by the acquisition module 11, step 02 by the first judgment module 12, step 03 by the second judgment module 13, and step 04 by the control module 14. That is, the acquisition module 11 acquires vehicle status information; the first judgment module 12 determines whether the vehicle has a high-power drive requirement and a charging requirement based on the vehicle status information, where a high-power drive requirement indicates that the output power of the electric drive system exceeds a preset power threshold; the second judgment module 13 determines whether the heat provided by the thermal management system meets the heating requirements corresponding to the high-power drive requirement and / or charging requirement if the vehicle has a high-power drive requirement and / or a charging requirement; the control module 14 controls the vehicle to distribute the torque of each drive motor according to a first torque distribution mode if the heat provided by the thermal management system meets the vehicle's heating requirements; wherein, when the vehicle is in the first torque distribution mode, the efficiency of the electric drive system is higher than a first preset threshold; if the heat provided by the thermal management system cannot meet the vehicle's heating requirements, the control module controls the vehicle to distribute the torque of each drive motor according to a second torque distribution mode to meet the vehicle's heating requirements; wherein, when the vehicle is in the second torque distribution mode, the efficiency of the electric drive system is lower than a second preset threshold. The electric drive system includes multiple drive motors, meaning that the electric drive system may include two or more drive motors.

[0032] Specifically, vehicle status information includes vehicle driving status, battery charge level, battery charging and discharging power, battery temperature, vehicle navigation information, vehicle driving mode, map information, and vehicle thermal management system status. This vehicle status information determines the scenario in which the vehicle is operating.

[0033] After acquiring vehicle status information, the system determines whether the vehicle has a high-power drive requirement or a charging requirement based on this information. Understandably, when the battery temperature is low, the battery charge is high, and the charging / discharging power is low, it's necessary to determine whether the vehicle currently or in the future has a high-power drive requirement or a charging requirement, thereby adjusting the torque distribution mode of the vehicle's drive motor in real time. Therefore, this invention can determine whether the vehicle has a high-power drive requirement or a charging requirement based on its vehicle status information.

[0034] High-power drive demand refers to an electric drive system's output power exceeding a preset power threshold. In other words, if the output power of an electric drive system exceeds a pre-set power limit or threshold, this can be considered a high-power drive demand. Specifically, high-power drive demand refers to the need for an electric drive system to provide power exceeding the conventional standard or rated power to meet the vehicle's power performance, acceleration performance, and hill-climbing performance requirements. The preset power threshold can be the rated power value of the electric drive system. This type of high-power drive demand typically occurs in high-performance cars, racing cars, or other applications where improved vehicle power performance is required.

[0035] In detail, determining whether a vehicle currently or in the future has a need for high-power drive requires consideration of multiple factors, including vehicle driving status, driving mode, driving environment, onboard equipment, and navigation information.

[0036] Specifically, in one embodiment, the present invention can determine whether the vehicle currently or in the future has a high-power drive requirement based on the vehicle's driving status and driving mode. For example, if the vehicle is accelerating, climbing a hill, or driving at high speed, or if the driving mode is Sport mode, then there may be a current or future high-power drive requirement.

[0037] In another embodiment, the present invention can also determine whether the vehicle currently or in the future has a high-power drive requirement based on the driving environment and on-board equipment. That is, specifically, the environmental conditions in which the vehicle is driven and the usage of on-board equipment can be considered to determine whether the vehicle currently or in the future has a high-power drive requirement. For example, driving in high-altitude areas or in rainy or snowy weather, or using on-board equipment such as air conditioning or audio systems, will increase the vehicle's power demand, thus indicating that the vehicle has a high-power drive requirement.

[0038] In another embodiment, the present invention can also determine whether the vehicle currently or in the future has a high-power drive requirement based on navigation information and map information. Specifically, it obtains the vehicle's future driving route and road condition information through the vehicle's navigation system and map information system. If the future driving route includes long uphill sections, congested road segments, etc., it may be necessary to prepare for a high-power drive requirement in advance.

[0039] In another embodiment, the present invention can also determine whether the vehicle currently or in the future has a high-power drive requirement based on onboard sensors and the control system. Specifically, the onboard sensors and control system are used to monitor the vehicle's operating status and related parameters, such as engine speed, accelerator pedal position, and vehicle speed. These parameters can be used to determine whether the vehicle currently has a high-power requirement. Taking the accelerator pedal position as an example, the position of the accelerator pedal can reflect the driver's acceleration requirements. The accelerator pedal position sensor can obtain the position information of the accelerator pedal. If the accelerator pedal is in a deeper position, it indicates that the driver needs greater acceleration, that is, greater power output.

[0040] In another embodiment, the present invention can also determine whether a vehicle currently or in the future has a high-power drive requirement based on historical data and statistical analysis. Specifically, by analyzing historical data and performing statistical analysis, the power demand of the vehicle under different conditions can be understood, thereby better predicting future power demand.

[0041] It is important to note that if any of the above methods determines that a vehicle currently or in the future has a need for high-power drive, then that need can be confirmed. The methods and steps described above are only a general reference; actual implementation may require consideration of more factors and complex logical judgments. Furthermore, to ensure the accuracy and effectiveness of the judgments, cooperation between various systems and the accuracy of the data are essential.

[0042] Subsequently, if the vehicle has a high-power drive requirement and / or a charging requirement, determine whether the heat provided by the thermal management system meets the vehicle's heating requirements corresponding to the high-power drive requirement and / or charging requirement.

[0043] That is, this includes the following three situations: (1) If it is determined that the vehicle has a high-power drive demand in the current or future preset time period, it can trigger a judgment on whether the heat provided by the thermal management system meets the heating demand of the vehicle corresponding to the high-power drive demand. (2) If the vehicle has a charging demand in the current or future preset time period, it can also trigger a judgment on whether the heat provided by the thermal management system meets the heating demand of the vehicle corresponding to the high-power drive demand. (3) If it is determined that the vehicle has a high-power drive demand in the current or future preset time period, and at the same time it is determined that the vehicle has a charging demand in the current or future preset time period, it can also trigger a judgment on whether the heat provided by the thermal management system meets the heating demand of the vehicle corresponding to the high-power drive demand.

[0044] If the heat provided by the thermal management system meets the vehicle's heating requirements, the system controls the vehicle to distribute the torque of each drive motor according to a first torque distribution mode. When the vehicle is in the first torque distribution mode, the efficiency of the electric drive system is higher than a first preset threshold. This first preset threshold can be, for example, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, or 89%, and is not limited here.

[0045] In other words, if the vehicle status information indicates that the battery temperature is low, the battery charge is high, and the charging / discharging power is low, and it is determined that the vehicle currently or in the future has a high-power drive demand or charging demand, and the heat provided by the thermal management system meets the vehicle's heating demand, then the vehicle is controlled to allocate the torque of each drive motor in the efficient first torque distribution mode, thereby improving the efficiency of the vehicle's electric drive system.

[0046] If the heat provided by the thermal management system is insufficient to meet the vehicle's heating needs, the system controls the vehicle to distribute the torque of each drive motor according to the second torque distribution mode to satisfy the vehicle's heating requirements. The second preset threshold can be, for example, 80%, 79%, 78%, 77%, 75%, 73%, 72%, 70%, 69%, or 65%, and is not limited here. The second preset threshold can be the same value as the first preset threshold, or it can be a different value; this is not limited here.

[0047] In other words, when the present invention detects that the vehicle's battery is in a state of low temperature, high battery charge, and low battery charging / discharging power, and if it determines that the vehicle currently or in the future has a strong power demand or charging demand and the thermal management system cannot meet the current heating demand, the vehicle controller can comprehensively consider the vehicle's status information, including vehicle driving status, battery charge, battery charging / discharging power, battery temperature, vehicle navigation information, vehicle driving mode, map information, and the status of the vehicle's thermal management system, and control the vehicle to enter an inefficient four-wheel drive torque distribution state. The heat from the electric drive circuit is used to raise the battery temperature to meet the user's needs and improve the user experience.

[0048] In summary, this invention proposes an inefficient four-wheel drive torque distribution strategy to reduce the overall working efficiency of the electric drive system and generate more heat through the electric drive system to meet the vehicle heating requirements in specific scenarios.

[0049] In other words, the present invention first obtains vehicle status information, and when the battery temperature is low, the battery charge is high, and the charging and discharging power is low in the vehicle status information, it can determine whether the vehicle currently or in the future has a high-power driving demand or a charging demand, thereby adjusting the torque distribution mode of the vehicle's drive motor in real time.

[0050] Understandably, this invention can determine whether a vehicle is in a specific scenario based on vehicle status information. For example, when the battery temperature is low, the battery charge is high, and the charging / discharging power is low in the vehicle status information, it can be determined that the vehicle is in a specific scenario. When the vehicle is in a specific scenario, it is first determined whether the vehicle currently or in the future has a high-power drive requirement or a charging requirement. If the vehicle currently or in the future has a high-power drive requirement or a charging requirement, it is then determined whether the heat provided by the vehicle's thermal management system can meet the vehicle's heating requirements. If the heat provided by the thermal management system cannot meet the vehicle's heating requirements, the vehicle is controlled to distribute the torque of the drive motor according to the second torque distribution mode to meet the vehicle's heating requirements.

[0051] Therefore, in this invention, when the vehicle is in a specific scenario, if the heat provided by the thermal management system cannot meet the vehicle's heating needs, the vehicle is controlled to distribute the torque of the drive motor according to the second torque distribution mode, thereby meeting the vehicle's heating needs and the user's usage needs, and improving the user experience.

[0052] In some implementations, the torque distribution method includes:

[0053] 05: If the vehicle does not have a high-power drive requirement and / or no charging requirement, control the vehicle to distribute the torque of each drive motor according to the first torque distribution mode.

[0054] Please combine Figure 2 Step 05 can be implemented by the control module 14. That is, the control module 14 is used to control the vehicle to distribute the torque of each drive motor according to the first torque distribution mode if the vehicle does not have a high-power drive requirement and / or no charging requirement.

[0055] Specifically, if the vehicle status information indicates that the battery temperature is low, the battery charge is high, and the charging / discharging power is low, and it is determined that the vehicle currently or in the future does not have a high-power drive requirement or a charging requirement, then the vehicle is controlled to allocate the torque of each drive motor in a highly efficient first torque allocation mode, thereby improving the efficiency of the vehicle's electric drive system.

[0056] Please see Figure 3 Step 04 includes:

[0057] 041: Obtain the total driving torque required by the driver under preset operating conditions;

[0058] 042: Determine the distribution ratio coefficient of the first torque distribution mode based on the driver's total driving torque demand and power consumption;

[0059] 043: Based on the distribution ratio coefficient of the first torque distribution mode and the total driving torque required by the driver, the first target torque of each drive motor in the first torque distribution mode is calculated.

[0060] Please combine Figure 2 Steps 041, 042, and 043 can be implemented by the control module 14. That is, the control module 14 is used to obtain the total driving torque demanded by the driver under preset operating conditions; determine the allocation ratio coefficient of the first torque distribution mode based on the total driving torque demanded by the driver and the power consumption; and calculate the first target torque of each drive motor under the first torque distribution mode based on the allocation ratio coefficient of the first torque distribution mode and the total driving torque demanded by the driver.

[0061] Specifically, taking a four-wheel drive vehicle with two drive motors as an example, the process of calculating the torque allocated to each drive motor is as follows:

[0062] When the vehicle is in driving mode, if the driver's total driving torque demand is T, where T>0, representing the driving torque, a highly efficient torque distribution scheme is typically determined by considering the driver's total driving torque demand and power consumption factors. This results in an efficient distribution ratio coefficient. In other words, when determining the distribution ratio coefficient for the first torque distribution mode, power consumption needs to be considered to achieve optimal power consumption and vehicle performance. Specifically, an optimal torque distribution table can be obtained through offline calculation. The optimal torque distribution ratio coefficient can then be calculated by looking up the table based on the current vehicle speed and total driving torque demand. The sign of torque T is related to direction; a torque T greater than 0 indicates clockwise torque, and T less than 0 indicates counterclockwise torque. Then, using this efficient distribution ratio coefficient, a target torque for the first efficient drive motor can be obtained as Th1, and the target torque for the second drive motor is Th2 = T - Th1. It should be noted that the efficient distribution ratio coefficient for the drive motor refers to the ratio of the drive motor's working efficiency under specific operating conditions to its ideal working efficiency. The specific operating condition can be either a driving condition or a feedback condition.

[0063] When the vehicle is in feedback mode, the total feedback torque required by the driver is T (T<0, indicating feedback). Usually, during forward development, a high-efficiency distribution ratio coefficient is obtained by comprehensively considering power consumption. Then, through this high-efficiency distribution ratio coefficient, the target torque of the first motor can be obtained as Th1, and the target torque of the second motor is Th2 = T-Th1.

[0064] For example, suppose the driver's total torque demand is TN·m and the efficient distribution ratio coefficient is k.

[0065] Based on the principle of forward development, the torque of the two drive motors can be distributed according to the following formula: Th1=T×k,Th2=T-Th1.

[0066] In detail, assuming the driver's total required torque T is 200 N·m and the efficient distribution ratio coefficient k is 0.6, then the torques of the two drive motors are as follows: the target torque of the first motor is 120 N·m and the target torque of the second motor is 80 N·m.

[0067] Thus, when the vehicle is in the first torque distribution mode, the present invention can distribute torque to each drive motor according to an efficient distribution ratio coefficient, thereby optimizing the efficiency of the electric drive system.

[0068] Please see Figure 4 Step 04 also includes:

[0069] 044: Obtain the rotational speed of each drive motor under preset operating conditions;

[0070] 045: The efficiency of each drive motor in the first torque distribution mode of the vehicle is calculated based on the rotational speed and the first target torque;

[0071] 046: The first heat generation power of the drive motor when the vehicle is in the first torque distribution mode is calculated based on the efficiency of each drive motor, the speed of the drive motor, and the first target torque of the drive motor.

[0072] 047: Determine the compensating heating power of the drive motor based on the vehicle's heating requirements;

[0073] 048: The target heating power of the drive motor is obtained by adding the first heating power to the compensated heating power when the vehicle is in the second torque distribution mode;

[0074] 049: Calculate the torque of each drive motor in the second torque distribution mode of the vehicle based on the target heat output.

[0075] Please combine Figure 2 Steps 044, 045, 046, 047, 048, and 049 can be implemented by the control module 14. That is, the control module 14 is used to acquire the rotational speed of each drive motor under preset operating conditions; calculate the efficiency of each drive motor in the first torque distribution mode based on the rotational speed and the first target torque; calculate the first heating power of the drive motor in the first torque distribution mode based on the efficiency of each drive motor, the rotational speed of the drive motor, and the first target torque of the drive motor; determine the compensation heating power of the drive motor based on the vehicle's heating requirements; add the first heating power to the compensation heating power to obtain the target heating power of the drive motor when the vehicle is in the second torque distribution mode; and calculate the torque of each drive motor in the second torque distribution mode based on the target heating power.

[0076] Specifically, the preset operating conditions can be either driving conditions or feedback conditions.

[0077] In detail, the four-wheel drive torque distribution strategy of the present invention is as follows: based on the heating requirements of the vehicle thermal management, the electric drive system needs to compensate for the additional heat generation power QC, to calculate the torque required to be output by each drive motor in the second torque distribution mode.

[0078] Generally, a motor efficiency cloud map can be obtained by testing a drive motor. A motor efficiency cloud map is a three-dimensional graph composed of motor speed, torque, and efficiency, similar to contour lines in geography. The X-axis represents motor speed, the Y-axis represents motor torque, and the Z-axis represents motor efficiency.

[0079] Therefore, the desired efficiency e of the drive motor can be obtained from the known motor speed n and the driver's desired target torque T, i.e., e = f(T).

[0080] Taking a four-wheel drive vehicle with two drive motors as an example, the process of calculating the torque allocated to each drive motor is as follows:

[0081] In one embodiment, when the vehicle is in driving mode: if the driver's total driving torque demand is T, where T > 0, representing the driving torque, then during forward development, power consumption is typically considered to obtain an efficient allocation ratio coefficient. Using this efficient allocation ratio coefficient, a target torque for the efficient first drive motor can be obtained as Th1, and the target torque for the second drive motor is Th2 = T - Th1. It should be noted that a torque T greater than 0 indicates a clockwise torque, and a torque less than 0 indicates a counter-clockwise torque. Therefore, the sign of the torque T is direction-dependent; clockwise torque T is positive, and counter-clockwise torque T is negative.

[0082] Based on Th1, n1 (speed of drive motor 1) and Th2, n2 (speed of drive motor 2), the efficiency eh1 of the first motor and the efficiency eh2 of the second motor can be calculated. The heat dissipation power Qh when the motors are operating at high efficiency is then:

[0083] Qh=Th1*n1 / 9550*(1 / eh1 -1)+Th2*n2 / 9550*(1 / eh2 -1) (1)

[0084] Therefore, the target heat dissipation power QT of the drive motor in the second torque distribution mode can be calculated:

[0085] QT=Qh+QC(2)

[0086] In other words, the heat provided by the thermal management system is insufficient to meet the vehicle's heating needs, so the system controls the vehicle to distribute the torque of each drive motor according to the second torque distribution mode in order to meet the vehicle's heating needs.

[0087] Assuming that the torques of the drive motors are inefficiently distributed in the first torque distribution mode, the first motor torque is: Tl1, and the second motor torque is: Tl2=T-Tl1. Correspondingly calculated, the first motor efficiency el1 and the second motor efficiency el2 are obtained:

[0088] el1=f(Tl1) (3)

[0089] el2=f(T-Tl1) (4)

[0090] Therefore, QT=Tl1*n1 / 9550*(1 / el1-1)+Tl2*n2 / 9550*(1 / el2-1) (5)

[0091] First motor torque requirement: 0<Tl1<T (the driver's total demanded drive torque) (6)

[0092] In the above (1) to (6), there is only one unknown quantity Tl1, so the first motor torque Tl1 can be obtained, and then the second motor torque Tl2 can be obtained.

[0093] In another embodiment, when the vehicle is in a regenerative working condition: the driver's total demanded regenerative torque is T, where T<0, representing a regenerative torque. Usually in forward development, a highly efficient distribution proportional coefficient is obtained by comprehensively considering power consumption, then a highly efficient target torque of the first motor can be obtained through this coefficient as: Th1, and the target torque of the second motor is Th2=T-Th1. According to Th1, n1 (the rotational speed of the first drive motor), Th2, n2 (the rotational speed of the second drive motor), the efficiency of the first motor: eh1, and the efficiency of the second motor: eh2 can be obtained. At this time, the heating power Qh when the motors operate efficiently is:

[0094] Qh=Th1*n1 / 9550*(1-eh1)+Th2*n2 / 9550*(1-eh2) (7)

[0095] Thus, the target heating power QT of the drive motors in the second torque distribution mode can be calculated:

[0096] QT=Qh+QC (8)

[0097] Assuming that the torques of the drive motors are inefficiently distributed in the first torque distribution mode, the first motor torque is: Tl1, and the second motor torque is: Tl2=T-Tl1. Correspondingly calculated, the first motor efficiency el1 and the second motor efficiency el2 are obtained:

[0098] el1=f(Tl1) (9)

[0099] el2=f(T-Tl1) (10)

[0100] Therefore, QT=Tl1*n1 / 9550*(1-eh1)+Tl2*n2 / 9550*(1-eh2)(11)

[0101] First motor torque requirement: (Total driver feedback torque) T <Tl1<0(12)

[0102] The above (7) to (12) have only one unknown, Tl1, which means that the torque of the first motor Tl1 can be obtained, and then the following can be obtained.

[0103] The torque of the second motor is Tl2.

[0104] Thus, when the heat provided by the thermal management system cannot meet the heating needs of the vehicle, the present invention can control the vehicle to distribute the torque of each drive motor according to the second torque distribution mode, and raise the battery temperature through the heat of the electric drive circuit to meet the heating needs of the vehicle and the user's usage needs, thereby improving the user experience.

[0105] In some implementations, the torque distribution method includes

[0106] 06: If the heat provided by the thermal management system cannot meet the heating needs of the vehicle, and the torque allocated to each drive motor according to the second torque distribution mode also cannot meet the heating needs of the vehicle, the distribution coefficient of the second torque distribution mode shall be calculated based on the maximum heat generation power of the electric drive system.

[0107] Please combine Figure 2 Step 06 can be implemented by the control module 14. That is to say, the control module 14 is used to calculate the distribution coefficient of the second torque distribution mode based on the maximum heat generation power of the electric drive system when the heat provided by the thermal management system cannot meet the heating needs of the vehicle, and the torque of each drive motor is distributed according to the second torque distribution mode, which also cannot meet the heating needs of the vehicle.

[0108] Specifically, as mentioned above, if there is no solution to the above formulas (1) to (6), that is, the heat provided by the thermal management system cannot meet the heating needs of the vehicle, and the vehicle cannot meet the heating needs of the vehicle by allocating the torque of each drive motor according to the second torque distribution mode, then the torque of the first motor and the torque of the second motor can be calculated according to the maximum value of the target heat generation power function of the electric drive system, so as to determine the distribution coefficient of the second torque distribution mode at this time.

[0109] That is, QT = Max(Tl1*n1 / 9550*(1 / el1 -1)+Th2*n2 / 9550*(1 / el2 -1)), which can be used to calculate the torque Tl1 of the first motor, and then the torque Tl2 of the second motor.

[0110] If the above formulas (7) to (12) have no solution, that is, the heat provided by the thermal management system cannot meet the heating needs of the vehicle, and the torque allocated to each drive motor according to the second torque distribution mode also cannot meet the heating needs of the vehicle, then the torque of the first motor and the torque of the second motor are calculated according to the maximum value of the target heat generation power function of the electric drive system, so as to determine the distribution coefficient of the second torque distribution mode at this time, that is:

[0111] QT = Max(Tl1*n1 / 9550*(1-eh1)+Tl2*n2 / 9550*(1-eh2)), which can be used to calculate the torque of the first motor and then the torque of the second motor.

[0112] Thus, in the vehicle torque distribution method of the present invention, if the heat provided by the thermal management system cannot meet the heating requirements of the vehicle, and the torque of each drive motor is distributed according to the second torque distribution mode, it is also impossible to meet the heating requirements of the vehicle. The distribution coefficient of the second torque distribution mode is calculated based on the maximum heat generation power of the electric drive system, so as to generate as much heat as possible through the electric drive system to meet the vehicle heating requirements in a specific scenario.

[0113] The following describes the specific determination method for identifying a vehicle's high-power drive requirement, i.e., determining that the vehicle is in a specific scenario.

[0114] Specifically, in one embodiment, the vehicle includes a battery, and the vehicle status information includes battery charge, battery temperature, and battery charging / discharging power. Step 01 includes:

[0115] 011: Obtain battery power, battery temperature, and battery charging / discharging power;

[0116] Step 02 includes:

[0117] 021: If the battery charge is higher than the first threshold, the battery temperature is lower than the second threshold, and the battery charging and discharging power is lower than the third threshold, it is determined that the vehicle has a high-power drive requirement.

[0118] Please combine Figure 2 Step 011 can be implemented by the acquisition module 11, and step 021 can be implemented by the first judgment module 12. That is to say, the acquisition module 11 is used to acquire the battery power, battery temperature, and battery charging and discharging power; the first judgment module 12 is used to determine that the vehicle has a high-power driving demand if the battery power is higher than a first threshold, the battery temperature is lower than a second threshold, and the battery charging and discharging power is lower than a third threshold.

[0119] The specific values ​​of the first, second, and third thresholds will vary depending on various factors such as vehicle type, usage environment, and battery type. These thresholds typically need to be determined through experimental testing and data analysis to ensure vehicle safety and performance under different conditions.

[0120] The first threshold can be, for example, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, or 60%. Generally, electric drive heating power compensation is only allowed when the battery charge is higher than the first threshold.

[0121] The second threshold can be, for example, -25℃, -24℃, -23℃, -22℃, -21℃, -20℃, -15℃, -14℃, -13℃, or -10℃. When the battery temperature is below the second threshold, measures need to be taken to raise the battery temperature to prevent the battery from becoming too cold.

[0122] The third threshold is determined by various factors such as battery type, vehicle type, and usage environment. When the battery charging and discharging power is lower than the third threshold, and the current driver's required output power is greater than the battery charging and discharging power, the driver should be reminded that the battery temperature is low and the battery power is limited.

[0123] In other words, the method of determining whether a vehicle has a high-power drive requirement can be achieved by acquiring the battery charge, battery temperature, and battery charging and discharging power in the electric vehicle. When the vehicle is detected to be in a specific scenario where the battery charge is higher than a first threshold, the battery temperature is lower than a second threshold, and the battery charging and discharging power is lower than a third threshold, it can be determined that the vehicle has a high-power drive requirement at this time.

[0124] Please see Figure 5 In one embodiment, the vehicle includes a battery, and step 03 includes:

[0125] 031: Real-time detection of the first heat provided by the thermal management system at the current moment, and calculation of the second heat required by the battery at the current moment;

[0126] 032: If the first heat is lower than the second heat, it is determined that the heat provided by the thermal management system cannot meet the vehicle's heating needs.

[0127] Please combine Figure 2 Steps 031 and 032 can be implemented by the second judgment module 13. The second judgment module 13 is used to detect the first heat provided by the thermal management system at the current moment in real time, and to calculate the second heat required by the battery at the current moment. If the first heat is lower than the second heat, it is determined that the heat provided by the thermal management system cannot meet the heating needs of the vehicle.

[0128] Specifically, the first heat refers to the heat provided by the vehicle's thermal management system to maintain the normal operating temperature of the battery. The value of the first heat needs to be determined based on factors such as the battery's operating temperature range and the design parameters of the thermal management system.

[0129] The second heat refers to the heat required by the battery at the current moment. The value of the first heat needs to be determined based on various factors such as the battery's charging and discharging status, workload, or ambient temperature.

[0130] Therefore, the present invention can compare the ratio of the heat provided by the thermal management system to the heat required by the battery at the current moment. If the first heat is lower than the second heat, it is determined that the heat provided by the thermal management system cannot meet the heating requirements of the vehicle.

[0131] In summary, the overall flowchart of the torque distribution method for vehicles of the present invention is as follows: Figure 6 As shown.

[0132] This application also provides a vehicle that includes the torque distribution device 10 described above.

[0133] The present invention also provides a non-volatile computer-readable storage medium containing a computer program. When the computer program is executed by one or more processors, it implements the torque distribution method for a vehicle as described in any of the above embodiments.

[0134] For example, when a computer program is executed by a processor, it implements the following steps for a torque distribution method in a vehicle:

[0135] 01: Obtain vehicle status information;

[0136] 02: Determine whether the vehicle has a high-power drive requirement and a charging requirement based on the vehicle status information. A high-power drive requirement indicates that the output power of the electric drive system exceeds the preset power threshold.

[0137] 03: If the vehicle has a high power drive requirement and / or a charging requirement, determine whether the heat provided by the thermal management system meets the heating requirements of the vehicle corresponding to the high power drive requirement and / or charging requirement.

[0138] 04: If the heat provided by the thermal management system meets the vehicle's heating requirements, the vehicle is controlled to distribute the torque of each drive motor according to the first torque distribution mode; wherein, when the vehicle is in the first torque distribution mode, the efficiency of the electric drive system is higher than the first preset threshold; if the heat provided by the thermal management system cannot meet the vehicle's heating requirements, the vehicle is controlled to distribute the torque of each drive motor according to the second torque distribution mode to meet the vehicle's heating requirements; wherein, when the vehicle is in the second torque distribution mode, the efficiency of the electric drive system is lower than the second preset threshold.

[0139] It is understood that a computer program includes computer program code. Computer program code can be in the form of source code, object code, executable files, or some intermediate form. Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, external hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc.

[0140] The computer-readable storage medium of the present invention applies the torque distribution method of the above-mentioned vehicle to control and distribute the torque of the drive motor. Specifically, when the vehicle is in a specific scenario, if the heat provided by the thermal management system cannot meet the heating needs of the vehicle, the vehicle control distributes the torque of each drive motor according to the second torque distribution mode, thereby meeting the heating needs of the vehicle and the user's usage needs, and improving the user experience.

Claims

1. A torque distribution method for a vehicle, characterized in that, The vehicle includes a thermal management system and an electric drive system, the electric drive system including multiple drive motors, and the torque distribution method includes: Obtain vehicle status information; Based on the vehicle status information, it is determined whether the vehicle has a high-power drive requirement and a charging requirement. The high-power drive requirement indicates that the output power of the electric drive system exceeds a preset power threshold. If the vehicle has a high-power drive requirement and / or the vehicle has a charging requirement, determine whether the heat provided by the thermal management system meets the heating requirements of the vehicle corresponding to the high-power drive requirement and / or the charging requirement. If the heat provided by the thermal management system meets the heating requirements of the vehicle, the vehicle is controlled to distribute the torque of each drive motor according to the first torque distribution mode; wherein, when the vehicle is in the first torque distribution mode, the efficiency of the electric drive system is higher than a first preset threshold. If the heat provided by the thermal management system is insufficient to meet the heating requirements of the vehicle, the vehicle is controlled to distribute the torque of each drive motor according to the second torque distribution mode to meet the heating requirements of the vehicle; wherein, when the vehicle is in the second torque distribution mode, the efficiency of the electric drive system is lower than a second preset threshold.

2. The torque distribution method according to claim 1, characterized in that, The torque distribution method includes: If the vehicle does not have the high-power drive requirement and / or the charging requirement, the vehicle is controlled to distribute the torque of each drive motor according to the first torque distribution mode.

3. The torque distribution method according to claim 2, characterized in that, If the vehicle does not have the high-power drive requirement and / or the charging requirement, controlling the vehicle to distribute the torque of each drive motor according to the first torque distribution mode includes: Obtain the total driving torque required by the driver under preset operating conditions for the vehicle; The allocation ratio coefficient of the first torque allocation mode is determined based on the driver's total driving torque demand and power consumption; Based on the allocation ratio coefficient of the first torque distribution mode and the total driving torque required by the driver, the first target torque of each drive motor under the first torque distribution mode is calculated.

4. The torque distribution method according to claim 3, characterized in that, If the heat provided by the thermal management system is insufficient to meet the heating requirements of the vehicle, controlling the vehicle to distribute the torque of each drive motor according to the second torque distribution mode to meet the vehicle's heating requirements includes: The rotational speed of each drive motor of the vehicle under preset operating conditions is obtained; The efficiency of each drive motor of the vehicle in the first torque distribution mode is calculated based on the rotational speed and the first target torque. The first heat generation power of the drive motor when the vehicle is in the first torque distribution mode is calculated based on the efficiency of each drive motor, the rotational speed of the drive motor, and the first target torque of the drive motor. The compensation heating power of the drive motor is determined based on the heating requirements of the vehicle. The first heating power is added to the compensated heating power to obtain the target heating power of the drive motor when the vehicle is in the second torque distribution mode; The torque of each drive motor in the second torque distribution mode of the vehicle is calculated based on the target heat generation power.

5. The torque distribution method according to claim 1, characterized in that, The torque distribution method includes If the heat provided by the thermal management system cannot meet the heating requirements of the vehicle, and the vehicle's torque distribution to each drive motor according to the second torque distribution mode also fails to meet the vehicle's heating requirements, the distribution coefficient of the second torque distribution mode is calculated based on the maximum heat generation power of the electric drive system.

6. The torque distribution method according to claim 1, characterized in that, The vehicle includes a battery, and the vehicle status information includes battery charge, battery temperature, and battery charging / discharging power. Obtaining the vehicle status information includes: Obtain the battery charge, battery temperature, and battery charge / discharge power; Determining whether the vehicle has a high-power drive requirement based on the vehicle status information includes: If the battery charge is higher than a first threshold, the battery temperature is lower than a second threshold, and the battery charging / discharging power is lower than a third threshold, it is determined that the vehicle has a high-power drive requirement.

7. The torque distribution method according to claim 1, characterized in that, The vehicle includes a battery, and determining whether the heat provided by the thermal management system meets the heating requirements of the vehicle corresponding to the high-power drive requirement or the charging requirement includes: Real-time detection of the first heat provided by the thermal management system at the current moment, and calculation of the second heat required by the battery at the current moment; If the first heat is lower than the second heat, it is determined that the heat provided by the thermal management system cannot meet the heating requirements of the vehicle.

8. A torque distribution device for a vehicle, characterized in that, The vehicle includes a thermal management system and an electric drive system, the electric drive system including multiple drive motors, and the torque distribution device including: The acquisition module is used to acquire vehicle status information; The first judgment module is used to determine whether the vehicle has a high-power drive requirement and a charging requirement based on the vehicle status information. The high-power drive requirement indicates that the output power of the electric drive system exceeds a preset power threshold. The second judgment module is used to determine whether the heat provided by the thermal management system meets the heating requirements of the vehicle corresponding to the high-power drive requirement and / or the charging requirement if the vehicle has the high-power drive requirement and / or the charging requirement. The control module is configured to, if the heat provided by the thermal management system meets the heating requirements of the vehicle, control the vehicle to distribute the torque of each drive motor according to a first torque distribution mode; wherein, when the vehicle is in the first torque distribution mode, the efficiency of the electric drive system is higher than a first preset threshold; if the heat provided by the thermal management system cannot meet the heating requirements of the vehicle, control the vehicle to distribute the torque of each drive motor according to a second torque distribution mode to meet the heating requirements of the vehicle; wherein, when the vehicle is in the second torque distribution mode, the efficiency of the electric drive system is lower than a second preset threshold.

9. A vehicle, characterized in that, The vehicle includes the torque distribution device of the vehicle as described in claim 8.

10. A non-volatile computer-readable storage medium containing a computer program, characterized in that, When the computer program is executed by one or more processors, it implements the torque distribution method for the vehicle according to any one of claims 1-7.

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