A torque distribution method, device and equipment for pure electric heavy truck

Abstract

The present application provides a torque distribution method, device and equipment for a pure electric heavy truck. The torque distribution method, device and equipment for a pure electric heavy truck provided in the present application searches for the torque demand from the MAP table corresponding to the current driving mode, and then determines the initial distribution ratio from the torque distribution table, and then when the first remaining power of the electric trailer is greater than the preset threshold, the initial distribution ratio is corrected according to the first remaining power and the second remaining power of the electric trailer, and the corrected distribution ratio is limited to obtain the final target distribution ratio. On the one hand, different driving modes use different MAP tables to determine the torque demand, which can improve the driving experience and vehicle performance. On the other hand, determining the initial distribution ratio based on a pre-established torque distribution table can improve energy efficiency and reduce waste. In addition, by correcting and limiting the distribution ratio according to the remaining power, the charge state can be balanced, energy consumption can be minimized and endurance can be maximized, and driving safety and stable performance can be ensured.

Description

Technical Field

[0001] The present application relates to the technical field of torque distribution, and in particular to a torque distribution method, device and equipment for a pure electric heavy truck. Background Art

[0002] With the continuous advancement of electrification technology, especially the improvement of battery energy density and the rapid popularization of charging facilities, pure electric heavy trucks with electric tractors and electric trailers have significantly improved in terms of endurance and charging efficiency, and can be used in a variety of logistics scenarios from short-distance delivery to medium and long-distance transportation.

[0003] Since the pure electric heavy truck that matches the electric trailer has two independent batteries, there will be a power balance problem between the trailer battery and the trailer battery during the actual transportation process. Furthermore, the power balance problem will further limit the usage capacity of the entire battery pack, resulting in a decline in the performance of the entire battery pack, and it is impossible to minimize energy consumption and maximize endurance. Summary of the invention

[0004] In view of this, the present application provides a torque distribution method, device and equipment for a pure electric heavy-duty truck, which is used to ensure that the remaining power of two independent batteries in the pure electric heavy-duty truck remains balanced during transportation while ensuring the vehicle's driving stability and driving safety, so as to minimize energy consumption and maximize endurance.

[0005] Specifically, the present application is implemented through the following technical solutions:

[0006] In a first aspect, the present application provides a torque distribution method for a pure electric heavy truck, wherein the pure electric heavy truck includes an electric trailer and an electric trailer; the torque distribution method includes:

[0007] When the pure electric heavy truck is started, the torque demand corresponding to the pedal position at the current moment and the vehicle speed at the current moment is searched from the MAP table corresponding to the driving mode at the current moment; wherein different driving modes correspond to different MAP tables, and each MAP table is used to record the torque demand under different pedal positions and vehicle speeds;

[0008] Searching for an initial distribution ratio that matches the vehicle speed at the current moment and the torque demand from a pre-established torque distribution table; wherein the pre-established torque distribution table is used to record the optimal torque distribution ratio of the electric trailer and the electric trailer of the pure electric heavy truck under different vehicle speeds and torque demands; the torque distribution ratio under each record is obtained by simulation analysis of the pure electric heavy truck;

[0009] When the first remaining power of the electric trailer at the current moment is greater than a preset threshold, the initial allocation ratio is corrected according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment, so as to ensure that the state of charge between the battery on the electric trailer and the battery on the electric trailer is balanced;

[0010] Limiting the revised allocation ratio obtained after the correction so that the restricted target allocation ratio meets the preset allocation range;

[0011] Torque is distributed between the electric tug vehicle and the electric trailer according to the target distribution ratio.

[0012] A second aspect of the present application provides a torque distribution device for a pure electric heavy truck, the pure electric heavy truck comprising an electric trailer and an electric trailer; the device comprises a search module, a correction module and a distribution module;

[0013] The search module is used to search for the torque demand corresponding to the pedal position at the current moment and the vehicle speed at the current moment from the MAP table corresponding to the driving mode at the current moment when the pure electric heavy truck is started; different driving modes correspond to different MAP tables, and each MAP table is used to record the torque demand under different pedal positions and vehicle speeds;

[0014] The search module is further used to search for an initial distribution ratio that matches the vehicle speed at the current moment and the torque demand from a pre-established torque distribution table; wherein the pre-established torque distribution table is used to record the optimal torque distribution ratio of the electric trailer and the electric trailer of the pure electric heavy truck under different vehicle speeds and torque demands; the torque distribution ratio under each record is obtained by simulation analysis of the pure electric heavy truck;

[0015] The correction module is used to correct the initial allocation ratio according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment when the first remaining power of the electric trailer at the current moment is greater than a preset threshold, so as to ensure that the charge state between the battery on the electric trailer and the battery on the electric trailer is balanced;

[0016] The correction module is further used to limit the corrected allocation ratio obtained after correction, so that the target allocation ratio after limitation meets the preset allocation range;

[0017] The distribution module is used to distribute torque to the electric tug and the electric trailer according to the target distribution ratio.

[0018] The third aspect of the present application provides a torque distribution device for a pure electric heavy truck, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any one of the methods provided in the first aspect of the present application are implemented.

[0019] The torque distribution method, device and equipment of the pure electric heavy truck provided in the present application searches for the torque demand corresponding to the pedal position at the current moment and the vehicle speed at the current moment from the MAP table corresponding to the driving mode at the current moment, and then searches for the initial distribution ratio that matches the vehicle speed at the current moment and the torque demand from the pre-established torque distribution table, so that when the first remaining power of the electric trailer at the current moment is greater than the preset threshold, the initial distribution ratio is corrected according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment, and the corrected distribution ratio is limited so that the target distribution ratio after the limit meets the preset distribution range, and finally the torque is distributed between the electric trailer and the electric trailer according to the target distribution ratio. In this way, on the first aspect, when the corresponding MAP table is used to determine the torque demand in different driving modes, it can be ensured that the vehicle is under different driving conditions. It can obtain the best torque demand, thereby improving driving experience and vehicle performance; secondly, a pre-established torque distribution table is used to determine the initial torque distribution ratio. Since the pre-established torque distribution table is obtained through simulation analysis, the initial torque distribution ratio determined based on this can ensure that the torque distribution between the electric tractor and the electric trailer is optimal, thereby improving the energy efficiency of the entire vehicle and reducing energy waste; thirdly, when distributing torque, the torque distribution is not directly based on the initial torque distribution ratio, but the initial distribution ratio is corrected according to the remaining power of the electric tractor and the electric trailer, and the repaired distribution ratio is further restricted. In this way, by correcting the initial distribution ratio, the charge state of the electric tractor and the electric trailer can be balanced to minimize energy consumption and maximize endurance. By limiting the corrected distribution ratio, the final target distribution ratio can be guaranteed to be within a reasonable range, which can ensure the driving safety and performance stability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A flowchart of a first embodiment of a torque distribution method for a pure electric heavy truck provided in the present application;

[0021] Figure 2 A flowchart of Embodiment 2 of the torque distribution method for a pure electric heavy truck provided in this application;

[0022] Figure 3 This is a flow chart of Embodiment 3 of the torque distribution method for a pure electric heavy truck provided in this application;

[0023] Figure 4 A flowchart of a fourth embodiment of a torque distribution method for a pure electric heavy truck provided in the present application;

[0024] Figure 5 A hardware structure diagram of the torque distribution device of the pure electric heavy truck in which the torque distribution device of the pure electric heavy truck of the present application is located;

[0025] Figure 6 This is a structural schematic diagram of Example 1 of the torque distribution device for a pure electric heavy truck provided in this application. DETAILED DESCRIPTION

[0026] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0027] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0028] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0029] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0030] Figure 1 This is a flow chart of the first embodiment of the torque distribution method for a pure electric heavy truck provided in this application. Figure 1 The torque distribution method of a pure electric heavy truck provided in this embodiment includes an electric tractor and an electric trailer; the torque distribution method includes:

[0031] S101. When the pure electric heavy truck is started, the torque demand corresponding to the pedal position at the current moment and the vehicle speed at the current moment is searched from the MAP table corresponding to the driving mode at the current moment; wherein different driving modes correspond to different MAP tables, and each MAP table is used to record the torque demand under different pedal positions and vehicle speeds.

[0032] The torque distribution method for a pure electric heavy truck provided in this embodiment is used to distribute torque for a pure electric heavy truck, wherein the pure electric heavy truck includes an electric tractor and an electric trailer, the electric tractor and the electric trailer are independent of each other and powered by two independent batteries.

[0033] Specifically, the MAP table is used to record the torque requirements under different pedal positions and vehicle speeds. In addition, the MAP table is pre-established. In specific implementation, the torque requirements corresponding to different pedal positions and vehicle speeds under different driving modes can be tested experimentally, the corresponding relationship between the pedal position, vehicle speed and torque requirements can be recorded, and a MAP table can be established based on multiple corresponding relationships.

[0034] It should be noted that, from the perspective of differences in vehicle power management, power output requirements, and driving experience, the driving modes of pure electric heavy trucks can include economic mode, power mode, and comfort mode. Among them, different modes make different balances and optimizations in terms of motor output power, energy consumption management, and driving comfort to cope with different driving needs and working conditions. Accordingly, one driving mode corresponds to one MAP table, and different driving modes correspond to different MAP tables.

[0035] In specific implementation, in this step, when the pure electric heavy truck is started, the current driving mode is obtained, and the MAP table corresponding to the current driving mode is searched from multiple MAP tables; further, the current pedal position and the current vehicle speed are obtained, and the torque demand corresponding to the current pedal position and the current vehicle speed is searched from the MAP table corresponding to the current driving mode.

[0036] S102. Searching for an initial distribution ratio that matches the current vehicle speed and the torque demand from a pre-established torque distribution table; wherein the pre-established torque distribution table is used to record the optimal torque distribution ratio of the electric tractor and the electric trailer of the pure electric heavy-duty truck under different vehicle speeds and torque demands; the torque distribution ratio under each record is obtained by simulation analysis of the pure electric heavy-duty truck.

[0037] Specifically, the torque distribution table records the optimal torque distribution ratio between the electric trailer and the electric trailer in the pure electric heavy truck under different vehicle speeds and torque requirements. Each record in the torque distribution table represents the torque distribution ratio when the electric trailer and the electric trailer in the pure electric heavy truck achieve the best performance and energy efficiency under specific vehicle speeds and torque requirements.

[0038] It should be noted that the torque distribution table is pre-established. In specific implementation, by simulating and analyzing the driving process of a pure electric heavy truck, the optimal torque distribution ratio corresponding to different vehicle speeds and torque requirements is obtained, and these data are recorded, and then the torque distribution table is established based on these data. A specific embodiment will be given below to explain in detail the process of establishing the torque distribution table, which will not be repeated here.

[0039] In specific implementation, in this step, based on the current vehicle speed and torque demand, the record containing the vehicle speed and torque demand can be directly searched from the torque distribution table, and then the optimal torque distribution ratio in the record is determined as the initial distribution ratio.

[0040] S103: When the first remaining power of the electric trailer at the current moment is greater than a preset threshold, the initial allocation ratio is corrected according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment to ensure that the charge state between the battery on the electric trailer and the battery on the electric trailer is balanced.

[0041] It should be noted that the torque distribution between the electric tractor and the electric trailer is to optimize the energy consumption of the electric tractor and the electric trailer. At the same time, it can also ensure that the power of the two batteries of the electric tractor and the electric trailer remains balanced during driving, avoiding uneven power consumption causing one of the batteries to have excessive power.

[0042] However, in actual applications, an electric tractor may be replaced with an electric trailer after a task is completed. Therefore, the remaining power of the electric tractor and the electric trailer may be unbalanced. At this time, after obtaining the initial distribution ratio, the torque between the electric tractor and the electric trailer is not directly distributed using the initial distribution ratio. Instead, the initial distribution ratio is further corrected to ensure that the charge state between the battery on the electric trailer and the battery on the electric trailer is balanced.

[0043] In a specific implementation, when the first remaining power of the electric trailer at the current moment is greater than a preset threshold, the initial allocation ratio can be corrected according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment. Optionally, in a possible implementation, the initial allocation ratio can be corrected by the following formula to obtain a corrected allocation ratio:

[0044] ;

[0045] in, is the initial allocation ratio;

[0046] The corrected allocation ratio is obtained after the correction;

[0047] The first remaining power of the electric trailer at the current moment;

[0048] It is the second remaining power of the electric trailer at the current moment.

[0049] It should be noted that due to the particularity of the operating environment of pure electric heavy trucks, the remaining power of the electric trailer has a very important impact on the overall transportation efficiency and safety. Therefore, in the actual operation process, priority will be given to ensuring the remaining power of the electric trailer (when the electric trailer is exhausted, the electric trailer can continue to tow the electric trailer).

[0050] Therefore, in the present application, when the remaining power of the electric trailer is sufficient, torque distribution is performed based on the method provided in this embodiment. Wherein, the first remaining power of the electric trailer at the current moment is greater than the preset threshold value, which means that the remaining power of the electric trailer is sufficient.

[0051] It should be noted that the preset threshold is set according to actual needs and is not limited in this embodiment. For example, in a possible implementation, the preset threshold is 20%.

[0052] Optionally, in a possible implementation, the method further includes:

[0053] When the first remaining power of the electric tug at the current moment is less than or equal to a preset threshold, the lower limit value of the preset distribution range is determined as the current distribution ratio, and torque is distributed between the electric tug and the electric trailer according to the current distribution ratio.

[0054] Referring to the previous description, it can be understood that when the first remaining power of the electric trailer at the current moment is less than or equal to the preset threshold value, it means that the remaining power of the electric trailer is about to be exhausted. At this time, the lower limit value of the preset allocation range is determined as the current allocation ratio, that is, the allocation coefficient of the electric trailer is reduced to the lower limit value of the preset allocation range, and the power of the electric trailer is used first to ensure that the electric trailer operates in the economic range, and the electric trailer can provide necessary power support.

[0055] Among them, in order to ensure the driving safety and performance stability of the vehicle, when the remaining power of all batteries is 100%, considering the influence of the electric drive axle efficiency, the acceptable range of the torque distribution ratio is the preset distribution range. Further, the preset distribution range is set according to actual needs and is not limited in this embodiment. For example, in a possible implementation, the preset distribution range is 55%-70%.

[0056] In combination with the above example, at this time, when the first remaining power of the electric trailer at the current moment is less than or equal to 20%, the current allocation ratio is determined to be 55%, that is, the allocation coefficient of the electric trailer is determined to be 55%.

[0057] S104: Limit the corrected allocation ratio obtained after correction, so that the restricted target allocation ratio complies with a preset allocation range.

[0058] In specific implementation, if the corrected allocation ratio is within the preset allocation range, the corrected allocation ratio is directly used as the target allocation ratio; if the corrected allocation ratio is less than the minimum value in the preset allocation range, the minimum value in the preset allocation range is used as the target allocation ratio; if the corrected allocation ratio is greater than the maximum value in the preset allocation range, the maximum value of the preset allocation range is used as the target allocation ratio.

[0059] S105. Distribute torque between the electric tug truck and the electric trailer according to the target distribution ratio.

[0060] Specifically, torque is distributed to the electric trailer and the electric trailer according to the torque demand proportions corresponding to the electric trailer and the electric trailer in the target distribution ratio.

[0061] The method provided in this embodiment searches for the torque demand corresponding to the pedal position at the current moment and the vehicle speed at the current moment from the MAP table corresponding to the driving mode at the current moment, and then searches for the initial distribution ratio that matches the vehicle speed at the current moment and the torque demand from the pre-established torque distribution table, so that when the first remaining power of the electric trailer at the current moment is greater than the preset threshold, the initial distribution ratio is corrected according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment, and the corrected distribution ratio is limited so that the target distribution ratio after the limit meets the preset distribution range, and finally the torque is distributed between the electric trailer and the electric trailer according to the target distribution ratio. In this way, on the first aspect, when the corresponding MAP table is used to determine the torque demand in different driving modes, it can be ensured that the vehicle can obtain the best under different driving conditions. Torque demand, thereby improving driving experience and vehicle performance; secondly, using a pre-established torque distribution table to determine the initial torque distribution ratio, since the pre-established torque distribution table is obtained through simulation analysis, the initial torque distribution ratio determined based on this can ensure that the torque distribution between the electric tractor and the electric trailer is optimal, thereby improving the energy efficiency of the entire vehicle and reducing energy waste; thirdly, when distributing torque, the torque distribution is not directly based on the initial torque distribution ratio, but the initial distribution ratio is corrected according to the remaining power of the electric tractor and the electric trailer, and the repaired distribution ratio is further restricted. In this way, by correcting the initial distribution ratio, the charge state of the electric tractor and the electric trailer can be balanced to minimize energy consumption and maximize endurance. By limiting the revised distribution ratio, the final target distribution ratio can be guaranteed to be within a reasonable range, which can ensure the driving safety and performance stability of the vehicle.

[0062] Figure 2 This is a flow chart of the second embodiment of the torque distribution method for a pure electric heavy truck provided in this application. Figure 2 Based on the above embodiment, the process of establishing the pre-established torque distribution table includes:

[0063] S201. Establish a simulation model; wherein the simulation model is used to simulate the total motor efficiency of the pure electric heavy truck under different vehicle speeds and torque requirements.

[0064] Specifically, simulation models can be established using simulation software such as MATLAB, Simulink, and AMESim to simulate the total motor efficiency of pure electric heavy trucks under various vehicle speeds and torque requirements, and obtain the total motor efficiency under various vehicle speeds and torque requirements.

[0065] Optional, Figure 3This is a flow chart of the third embodiment of the torque distribution method for a pure electric heavy truck provided in this application. Figure 3 Based on the above embodiment, the establishment of the simulation model includes:

[0066] S301. Based on the first functional relationship between the output power of the motor and the output torque of the motor and the motor speed, a second functional relationship is established between the total output power of the pure electric heavy truck and the first output torque of the electric trailer, the first motor speed of the electric trailer, the second output torque of the electric trailer, and the second motor speed of the electric trailer.

[0067] Specifically, the first function can be expressed by the following formula:

[0068] ;

[0069] in, is the output power of the motor;

[0070] is the output torque of the motor;

[0071] is the motor speed.

[0072] Specifically, the first output torque of the electric trailer and the first motor speed of the electric trailer are substituted into the first functional relationship to obtain the output power of the motor of the electric trailer; the second output torque of the electric trailer and the second motor speed of the electric trailer are substituted into the first functional relationship to obtain the output power of the motor of the electric trailer. Furthermore, the total output power of the pure electric heavy truck is equal to the sum of the output power of the motor of the electric trailer and the output power of the motor of the electric trailer. According to the output power of the motor of the electric trailer and the output power of the motor of the electric trailer, a second functional relationship between the total output power of the pure electric heavy truck and the first output torque of the electric trailer, the first motor speed of the electric trailer, the second output torque of the electric trailer, and the second motor speed of the electric trailer can be established.

[0073] Specifically, the second function can be expressed by the following formula:

[0074] ;

[0075] in, is the total output power of the pure electric heavy truck;

[0076] is the output power of the motor of the electric trailer;

[0077] is the output power of the motor of the electric trailer;

[0078] is a first output torque of the electric tractor;

[0079] is the first motor speed of the electric trailer;

[0080] is a second output torque of the electric trailer;

[0081] is the speed of the second motor of the electric trailer.

[0082] S302. Based on the third functional relationship between the power consumption of the motor and the output power and efficiency of the motor, and the second functional relationship, a fourth functional relationship is established between the total power consumption of the pure electric heavy truck and the first output torque of the electric trailer, the first motor speed of the electric trailer, the first motor efficiency of the electric trailer, the second output torque of the electric trailer, the second motor speed of the electric trailer, and the second motor efficiency of the electric trailer.

[0083] Specifically, the third function can be expressed by the following formula:

[0084] ;

[0085] in, is the power consumption of the motor;

[0086] is the output power of the motor;

[0087] is the motor efficiency.

[0088] Specifically, the first output torque of the electric trailer, the first motor speed of the electric trailer, and the first motor efficiency of the electric trailer are substituted into the third functional relationship to obtain the electric power consumption of the motor of the electric trailer, and the second output torque of the electric trailer, the second motor speed of the electric trailer, and the second motor efficiency of the electric trailer are substituted into the third functional relationship to obtain the electric power consumption of the motor of the electric trailer. Furthermore, the total electric power consumption of the pure electric heavy truck is the sum of the electric power consumption of the motor of the electric trailer and the electric power consumption of the motor of the electric trailer, and thus, the fourth functional relationship can be established according to the third functional relationship.

[0089] Specifically, the fourth function can be expressed by the following formula:

[0090] ;

[0091] in, is the total power consumption of pure electric heavy truck;

[0092] The power consumption of the motor of the electric trailer;

[0093] The power consumption of the motor of the electric trailer;

[0094] is a first output torque of the electric tractor;

[0095] is the first motor speed of the electric trailer;

[0096] is a second output torque of the electric trailer;

[0097] is the speed of the second motor of the electric trailer;

[0098] First motor efficiency for electric trailers;

[0099] The efficiency of the second motor of the electric trailer.

[0100] S303. Based on the second functional relationship, the third functional relationship, and the fourth functional relationship, determine the fifth functional relationship between the total motor efficiency of the pure electric heavy truck and the first output torque of the electric trailer, the first motor speed of the electric trailer, the first motor efficiency of the electric trailer, the second output torque of the electric trailer, the second motor speed of the electric trailer, and the second motor efficiency of the electric trailer.

[0101] Specifically, based on the second functional relationship, the total output power of the pure electric heavy truck can be obtained according to the first output torque of the electric trailer, the first motor speed of the electric trailer, the second output torque of the electric trailer, and the second motor speed of the electric trailer. Further, based on the fourth functional relationship, the total power consumption of the pure electric heavy truck can be obtained according to the first output torque of the electric trailer, the first motor speed of the electric trailer, the first motor efficiency of the electric trailer, the second output torque of the electric trailer, the second motor speed of the electric trailer, and the second motor efficiency of the electric trailer. Further, from the third functional relationship, it can be seen that the total motor efficiency of the pure electric heavy truck is equal to the ratio of the total power consumption of the pure electric heavy truck to the total output power of the pure electric heavy truck.

[0102] To sum up, by substituting the total output power of the pure electric heavy-duty truck output by the second functional relationship and the total power consumption of the pure electric heavy-duty truck output by the fourth functional relationship into the variant of the third functional relationship, we can obtain the fifth functional relationship between the total motor efficiency of the pure electric heavy-duty truck and the first output torque of the electric trailer, the first motor speed of the electric trailer, the first motor efficiency of the electric trailer, the second output torque of the electric trailer, the second motor speed of the electric trailer, and the second motor efficiency of the electric trailer.

[0103] Specifically, the fifth function can be expressed by the following formula:

[0104] ;

[0105] in, is the total motor efficiency of a pure electric heavy truck;

[0106] is the total power consumption of pure electric heavy truck;

[0107] is the total output power of the pure electric heavy truck;

[0108] is a first output torque of the electric tractor;

[0109] is the first motor speed of the electric trailer;

[0110] is a second output torque of the electric trailer;

[0111] is the speed of the second motor of the electric trailer;

[0112] First motor efficiency for electric trailers;

[0113] The efficiency of the second motor of the electric trailer.

[0114] S304, integrating the sixth functional relationship between motor speed and vehicle speed, wheel radius, and speed ratio, the seventh functional relationship between the distributed torque of the electric trailer and the total torque demand of the pure electric heavy truck, and the torque distribution ratio, the eighth functional relationship between the distributed torque of the electric trailer and the total torque demand of the pure electric heavy truck, and the torque distribution ratio, the ninth functional relationship between the motor efficiency and the output torque of the motor, and the motor speed, and the fifth functional relationship, to obtain the simulation model; wherein, the simulation model is used to characterize the functional relationship between the total motor efficiency of the pure electric heavy truck and the total torque demand of the pure electric heavy truck, the vehicle speed, and the torque distribution ratio.

[0115] Specifically, the sixth functional relationship between the motor speed and the vehicle speed, wheel radius, and speed ratio can be expressed by the following formula:

[0116] ;

[0117] in, is the vehicle speed;

[0118] is the speed of the motor;

[0119] is the wheel radius;

[0120] For the speed ratio.

[0121] Specifically, the sixth functional relationship is used to represent the relationship between the motor speed and the vehicle speed. Based on the sixth functional relationship, the speed of the electric tractor and the speed of the electric trailer can be determined according to the vehicle speed.

[0122] It should be noted that the speed ratio changes automatically according to the vehicle speed, and is divided into three gears according to different vehicle speeds.

[0123] Furthermore, the seventh function between the distributed torque of the electric trailer and the total torque demand and torque distribution ratio of the pure electric heavy truck can be expressed by the following formula:

[0124] ;

[0125] in, Distribute torque for electric trailers;

[0126] To distribute the torque ratio;

[0127] is the total torque requirement of the pure electric heavy truck.

[0128] Similarly, the eighth function between the distributed torque of the electric trailer and the total torque demand and torque distribution ratio of the pure electric heavy truck can be expressed by the following formula:

[0129] ;

[0130] in, Distribute torque for electric trailers;

[0131] To distribute the torque ratio;

[0132] is the total torque requirement of the pure electric heavy truck.

[0133] Specifically, by using the seventh functional relationship and the eighth functional relationship, the distributed torque of the electric tractor and the distributed torque of the electric trailer can be calculated based on the total torque demand and the torque distribution ratio of the pure electric heavy truck.

[0134] Furthermore, the ninth functional relationship between the motor efficiency and the motor output torque and motor speed can be represented by the motor efficiency diagram. The motor efficiency diagram shows the efficiency at different output torques and motor speeds (wherein the efficiency is usually a number between 0 and 1, which is used to represent the ratio between the mechanical output power and the electrical power consumption).

[0135] To summarize, when the total torque demand, vehicle speed and torque distribution coefficient of the pure electric heavy truck are known, the sixth functional relationship can be used to calculate the first motor speed of the electric trailer and the second motor speed of the electric trailer based on the vehicle speed; further, based on the seventh functional relationship and the eighth functional relationship, the first distributed torque of the electric trailer and the second distributed torque of the electric trailer can be calculated; based on the ninth functional relationship, the first motor efficiency of the electric trailer and the second motor efficiency of the electric trailer can be obtained; further, the distributed torque is used as the output torque, and based on the fifth functional relationship, the first output torque of the electric trailer, the first motor speed of the electric trailer, the first motor efficiency of the electric trailer, the second output torque of the electric trailer, the second motor speed of the electric trailer, and the second motor efficiency of the electric trailer are substituted into the fifth functional relationship to obtain the total motor efficiency of the pure electric heavy truck.

[0136] In other words, by integrating the sixth functional relationship between motor speed and vehicle speed, wheel radius, and speed ratio, the seventh functional relationship between the distributed torque of the electric trailer and the total torque demand of the pure electric heavy truck, and the torque distribution ratio, the eighth functional relationship between the distributed torque of the electric trailer and the total torque demand of the pure electric heavy truck, and the torque distribution ratio, the ninth functional relationship between the motor efficiency and the output torque of the motor, and the motor speed, and the fifth functional relationship, the simulation model can be obtained. The simulation model is used to characterize the functional relationship between the total motor efficiency of the pure electric heavy truck and the total torque demand of the pure electric heavy truck, the vehicle speed, and the torque distribution ratio. Since the functional relationship is relatively complex, its display expression is not given here.

[0137] Referring to the previous description, it can be understood that the input of the simulation model is the total torque demand, vehicle speed and torque distribution ratio, and the output is the total motor efficiency of the pure electric heavy truck. Through this simulation model, different torque distribution ratios can be set under different total torque demands and vehicle speeds. It simulates the total motor efficiency under each torque distribution ratio, and then selects the optimal torque distribution ratio.

[0138] The method provided in this embodiment, by establishing a simulation model, can deeply analyze the relationship between the total motor efficiency and multiple variables based on this simulation model, and then use the simulation model to identify the optimal operating point of the motor efficiency, so as to determine the optimal torque distribution ratio that can maintain efficient operation of the motor under various working conditions, and then perform torque distribution based on the optimal torque distribution ratio to improve the overall efficiency of the motor system, while reducing energy consumption, extending the life of the motor, and reducing operating costs.

[0139] S202, using the simulation model to simulate the total motor efficiency of the pure electric heavy truck under various vehicle speeds and torque requirements, to obtain the total motor efficiency under various vehicle speeds and torque requirements.

[0140] As described above, during the simulation process, the vehicle speed, total torque demand and torque distribution ratio are input into the simulation model to obtain the corresponding total motor efficiency. For each combination of vehicle speed and total torque demand, a corresponding database is established, which stores the total motor efficiency corresponding to different torque distribution ratios under the combination of vehicle speed and total torque demand.

[0141] S203, constructing an objective function according to the total capacity of the batteries of the electric tractor and the total capacity of the batteries of the electric trailer; wherein the objective function is used to maintain a balance in the states of charge of the batteries of the electric tractor and the electric trailer.

[0142] Specifically, in order to maintain a balance in the state of charge of the batteries of the electric trailer and the electric trailer, in theory, without considering recycling, the ratio of the total capacity of the battery of the electric trailer to the power consumption of the motor of the electric trailer should be equal to the ratio of the total capacity of the battery of the electric trailer to the power consumption of the battery of the electric trailer.

[0143] Therefore, in order to maintain the balance of the charge states of the batteries of the electric tractor and the electric trailer, in a possible implementation, the objective function is set as follows:

[0144] ;

[0145] Where R1 is the total capacity of the battery of the electric trailer;

[0146] D1 is the power consumption of the motor of the electric trailer;

[0147] R2 is the total capacity of the battery of the electric trailer;

[0148] D2 is the power consumption of the motor of the electric trailer.

[0149] That is, through the objective function, we expect to find Minimum torque distribution ratio.

[0150] S204. For each combination of vehicle speed and torque demand, select a target total motor efficiency from multiple total motor efficiencies under the vehicle speed and the torque demand; wherein the torque distribution ratio corresponding to the target total motor efficiency conforms to the preset distribution range, and the target total motor efficiency is greater than or equal to the preset motor efficiency.

[0151] Specifically, referring to the previous description, for each combination of vehicle speed and torque demand, there is a corresponding database, which stores the total motor efficiency corresponding to different torque distribution ratios under the vehicle speed and torque demand. In this step, for each combination of vehicle speed and torque demand, the total motor efficiency that meets the preset conditions can be selected from the multiple total motor efficiencies corresponding to the vehicle speed and the torque demand, and the total motor efficiency that meets the preset conditions is the target total motor efficiency. Among them, the preset conditions of this embodiment are that the torque distribution ratio corresponding to the target total motor efficiency meets the preset distribution range, and the target total motor efficiency is greater than or equal to the preset motor efficiency.

[0152] In specific implementation, we can first find out the alternative total motor efficiencies with a torque distribution ratio within a preset distribution range, and then find out from the alternative total motor efficiencies a total motor efficiency that is greater than or equal to the preset motor efficiency (that is, a higher total motor efficiency). The total motor efficiency finally found is the target total motor efficiency.

[0153] It should be noted that the preset distribution range refers to the proportion range of the electric trailer in the torque distribution ratio. In addition, the preset motor efficiency is set according to actual needs and is not limited in this embodiment. For example, in one embodiment, the preset motor efficiency is 90%.

[0154] S205 , searching for an optimal solution that optimizes the objective function from the target total motor efficiency, and determining the torque distribution ratio corresponding to the optimal solution as the optimal torque distribution ratio corresponding to the combination of vehicle speed and torque demand.

[0155] Referring to the previous description, through the simulation model, not only the total motor efficiency corresponding to each torque distribution ratio under different vehicle speeds and torque requirements can be obtained, but also the motor power consumption of the electric trailer under the vehicle speed and torque requirements, and the motor power consumption of the electric trailer can be obtained.

[0156] In this step, the power consumption of the electric trailer and the power consumption of the electric trailer corresponding to each target total motor efficiency are substituted into the objective function (i.e., into ), and obtain the corresponding calculation results. Further, a minimum value is selected from multiple calculation results, and the minimum value is the optimal solution that makes the objective function optimal. Finally, the torque distribution ratio corresponding to the optimal solution is determined as the optimal torque distribution ratio corresponding to the combination of vehicle speed and torque demand.

[0157] S206: Construct the torque distribution table according to the optimal torque distribution ratio corresponding to each combination of vehicle speed and torque demand.

[0158] Specifically, referring to the previous description, through step S205, the optimal torque distribution ratio corresponding to each combination of vehicle speed and torque demand can be obtained. The vehicle speed, torque demand and optimal torque distribution ratio are taken as a group of data. In this step, the optimal torque distribution ratio corresponding to each combination of vehicle speed and torque demand is combined together to establish a torque distribution table.

[0159] The method provided in this embodiment, by establishing an accurate simulation model and objective function, can simulate in detail the total motor efficiency of a pure electric heavy truck under different vehicle speeds and torque requirements, and then can identify the optimal torque distribution ratio under various driving conditions, which can not only ensure driving safety and stability, but also ensure the balance of the battery charge state of the electric tractor and the electric trailer, and significantly improve the overall efficiency of the motor system.

[0160] Figure 4 This is a flow chart of the fourth embodiment of the torque distribution method for a pure electric heavy truck provided in this application. Figure 4 Based on the above embodiment, torque is distributed between the electric tug and the electric trailer according to the target distribution ratio, including:

[0161] S401. Calculate the distributed torque of the electric tug vehicle and the distributed torque of the electric trailer according to the target distribution ratio and the torque demand.

[0162] Specifically, the distributed torque of the electric tractor and the distributed torque of the electric trailer can be calculated by the following formula:

[0163] ;

[0164] ;

[0165] in, Distribute torque for electric trailers;

[0166] Distribute torque for electric trailers;

[0167] Allocate proportions to goals;

[0168] For torque demand.

[0169] S402: When the distributed torque of any one of the electric tractor and the electric trailer exceeds the limited torque of the vehicle, use the limited torque as the corrected distributed torque of the vehicle.

[0170] S403: Calculate the difference between the distributed torque of the vehicle and the limit torque, and use the sum of the difference and the distributed torque of another vehicle as the corrected distributed torque of the other vehicle.

[0171] S404: Distribute torque to the electric trailer according to the corrected distributed torque of the electric trailer, and distribute torque to the electric trailer according to the corrected distributed torque of the electric trailer.

[0172] Specifically, in actual operation, the electric drive axle may be subject to limitations such as motor torque limitation, battery management system current limitation, fault diagnosis limitation, etc., resulting in the actual output torque of the electric tractor and / or electric trailer being limited, that is, the electric tractor and / or electric trailer has limited torque. Therefore, when the distributed torque of the electric tractor and electric trailer is calculated, the torque of the electric tractor and electric trailer is not immediately distributed accordingly, but the distributed torque is adjusted to adapt to these limitations.

[0173] Specifically, when the distributed torque of any one of the electric trailer and the electric trailer exceeds its corresponding limited torque, the limited torque is used as the corrected distributed torque of the vehicle. Furthermore, in order to meet the total torque demand, the difference between the distributed torque of the vehicle and the limited torque is used as the compensation torque, and the compensation torque is compensated to the other vehicle, that is, the sum of the compensation torque and the distributed torque of the other vehicle is used as the corrected distributed torque of the other vehicle, and then the torque is distributed to the electric trailer and the electric trailer according to the corrected distributed torque.

[0174] That is, to ensure the vehicle's dynamic performance, the vehicle that exceeds the limit torque is compensated. If the electric trailer's distributed torque exceeds its limit torque, the limited part (the compensation torque mentioned above) is added to the electric trailer's distributed torque, and vice versa. If the distributed torques of both exceed their limit torques, no compensation is performed.

[0175] In specific implementation, for example, in one possible implementation, the torque demand is 1000, the distributed torque of the electric trailer is 600, and the limited torque is 550; the distributed torque of the electric trailer is 400, and the limited torque is 500; at this time, the distributed torque of the electric trailer exceeds its limited torque, and 550 is used as the corrected distributed torque of the electric trailer; further, it is determined that the difference between the distributed torque and the limited torque of the electric trailer is 50, and after compensating the difference to the electric trailer, the corrected distributed torque of the electric trailer is 450.

[0176] The method provided in this embodiment can enhance the safety and adaptability of the system and ensure the stability and power performance of the vehicle by adjusting the distributed torque.

[0177] Optionally, in a possible implementation, after distributing torque to the electric tug and the electric trailer according to the target distribution ratio, the method further includes:

[0178] When the change in the remaining power of the electric trailer reaches a preset change threshold, the step of correcting the initial allocation ratio according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment is performed again.

[0179] Specifically, when the change in the remaining power of the electric trailer reaches a preset change threshold, the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment are corrected again according to the initial allocation ratio.

[0180] It should be noted that the preset change threshold is set according to actual needs and is not limited in this embodiment. For example, in one embodiment, the preset change threshold is 5%.

[0181] The method provided in this embodiment can, on the one hand, monitor the change of power and adjust the torque distribution ratio in time when the change reaches a certain threshold, so as to ensure that the torque distribution of the electric trailer and the trailer is more reasonable, thereby ensuring that the power consumption of the trailer and the trailer is more balanced, avoiding the power of one party from being exhausted too quickly, so as to maximize the overall cruising range of the vehicle and reduce the energy waste caused by uneven power. On the other hand, when the remaining power of the trailer changes significantly, it means that the power output or energy recovery of the trailer has changed. At this time, by adjusting the torque distribution ratio, the power output of the trailer and the trailer can be made more coordinated, thereby maintaining the stability of the vehicle's power performance, so that the vehicle can adapt to various complex road conditions and improve the vehicle's traffic capacity and driving stability.

[0182] Corresponding to the aforementioned embodiment of a torque distribution method for a pure electric heavy truck, the present application also provides an embodiment of a torque distribution device for a pure electric heavy truck.

[0183] The present application discloses an embodiment of a torque distribution device for a pure electric heavy truck, which can be applied to the torque distribution device of a pure electric heavy truck. The device embodiment can be implemented by software, or by hardware or a combination of software and hardware. Taking software implementation as an example, as a device in a logical sense, the processor of the torque distribution device of the pure electric heavy truck reads the corresponding computer program instructions in the non-volatile memory into the memory and runs them. From the hardware level, if Figure 5 As shown, it is a hardware structure diagram of the torque distribution device of the pure electric heavy truck in this application. Figure 5 In addition to the processor, memory, network interface, and non-volatile memory shown, the torque distribution device of the pure electric heavy truck where the device is located in the embodiment may also include other hardware according to the actual function of the torque distribution device of the pure electric heavy truck, which will not be elaborated here.

[0184] Figure 6This is a structural diagram of the first embodiment of the torque distribution device of the pure electric heavy truck provided in this application. Figure 6 , the device provided in this embodiment, the pure electric heavy truck includes an electric trailer and an electric trailer; the device includes a search module 610, a correction module 620 and an allocation module 630;

[0185] The search module 610 is used to search the torque demand corresponding to the pedal position at the current moment and the vehicle speed at the current moment from the MAP table corresponding to the driving mode at the current moment when the pure electric heavy truck is started; different driving modes correspond to different MAP tables, and each MAP table is used to record the torque demand under different pedal positions and vehicle speeds;

[0186] The search module 610 is further used to search for an initial distribution ratio that matches the vehicle speed at the current moment and the torque demand from a pre-established torque distribution table; wherein the pre-established torque distribution table is used to record the optimal torque distribution ratio of the electric trailer and the electric trailer of the pure electric heavy truck under different vehicle speeds and torque demands; the torque distribution ratio under each record is obtained by simulation analysis of the pure electric heavy truck;

[0187] The correction module 620 is used to correct the initial allocation ratio according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment when the first remaining power of the electric trailer at the current moment is greater than a preset threshold, so as to ensure that the charge state between the battery on the electric trailer and the battery on the electric trailer is balanced;

[0188] The correction module 620 is further used to limit the corrected allocation ratio obtained after correction, so that the target allocation ratio after limitation meets the preset allocation range;

[0189] The allocation module 630 is used to distribute torque to the electric tug and the electric trailer according to the target allocation ratio.

[0190] The device of this embodiment can be used to perform Figure 1 The steps, specific implementation principles and implementation processes of the method embodiment shown are similar and will not be repeated here.

[0191] Please continue to refer to Figure 5 The present application also provides a torque distribution device for a pure electric heavy truck, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any one of the methods provided in the first aspect of the present application are implemented.

[0192] The implementation process of the functions and effects of each unit in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, and will not be repeated here.

[0193] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0194] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A torque distribution method for a pure electric heavy truck, characterized in that: The pure electric heavy truck includes an electric trailer and an electric trailer; the torque distribution method includes: When the pure electric heavy truck is started, the torque demand corresponding to the pedal position at the current moment and the vehicle speed at the current moment is searched from the MAP table corresponding to the driving mode at the current moment; wherein different driving modes correspond to different MAP tables, and each MAP table is used to record the torque demand under different pedal positions and vehicle speeds; Searching for an initial distribution ratio that matches the vehicle speed at the current moment and the torque demand from a pre-established torque distribution table; wherein the pre-established torque distribution table is used to record the optimal torque distribution ratio of the electric trailer and the electric trailer of the pure electric heavy truck under different vehicle speeds and torque demands; the torque distribution ratio under each record is obtained by simulation analysis of the pure electric heavy truck; When the first remaining power of the electric trailer at the current moment is greater than a preset threshold, the initial allocation ratio is corrected according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment, so as to ensure that the state of charge between the battery on the electric trailer and the battery on the electric trailer is balanced; Limiting the revised allocation ratio obtained after the correction so that the restricted target allocation ratio meets the preset allocation range; Distributing torque between the electric tug vehicle and the electric trailer according to the target distribution ratio; The process of establishing the pre-established torque distribution table includes: Establishing a simulation model; wherein the simulation model is used to simulate the total motor efficiency of the pure electric heavy truck under different vehicle speeds and torque requirements; Using the simulation model, the total motor efficiency of the pure electric heavy truck under various vehicle speeds and torque requirements is simulated to obtain the total motor efficiency under various vehicle speeds and torque requirements; Constructing an objective function according to the total capacity of the battery of the electric trailer and the total capacity of the battery of the electric trailer; wherein the objective function is used to maintain a balance in the state of charge of the batteries of the electric trailer and the electric trailer; For each combination of vehicle speed and torque demand, a target total motor efficiency is selected from a plurality of total motor efficiencies under the vehicle speed and the torque demand; wherein the torque distribution ratio corresponding to the target total motor efficiency conforms to the preset distribution range, and the target total motor efficiency is greater than or equal to the preset motor efficiency; Finding an optimal solution that makes the objective function optimal from the target total motor efficiency, and determining the torque distribution ratio corresponding to the optimal solution as the optimal torque distribution ratio corresponding to the combination of vehicle speed and torque demand; Constructing the torque distribution table according to the optimal torque distribution ratio corresponding to each combination of vehicle speed and torque demand; The objective function is: ； Among them, R1 is the total capacity of the battery of the electric trailer, and D1 is the power consumption of the motor of the electric trailer; R2 is the total capacity of the battery of the electric trailer, and D2 is the power consumption of the motor of the electric trailer; The correcting the initial allocation ratio according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment includes: The initial allocation ratio is modified according to the following formula: ； in, is the initial allocation ratio; The corrected allocation ratio is obtained after the correction; The first remaining power of the electric trailer at the current moment; It is the second remaining power of the electric trailer at the current moment.

2. The method according to claim 1, characterized in that The simulation model is established, comprising: According to the first functional relationship between the output power of the motor and the output torque and the motor speed of the motor, a second functional relationship is established between the total output power of the pure electric heavy truck and the first output torque of the electric trailer, the first motor speed of the electric trailer, the second output torque of the electric trailer, and the second motor speed of the electric trailer; According to the third functional relationship between the electric power consumption of the motor and the output power and the motor efficiency of the motor, and the second functional relationship, a fourth functional relationship is established between the total electric power consumption of the pure electric heavy truck and the first output torque of the electric trailer, the first motor speed of the electric trailer, the first motor efficiency of the electric trailer, the second output torque of the electric trailer, the second motor speed of the electric trailer, and the second motor efficiency of the electric trailer; According to the second functional relationship, the third functional relationship, and the fourth functional relationship, a fifth functional relationship is determined between the total motor efficiency of the pure electric heavy truck and the first output torque of the electric trailer, the first motor speed of the electric trailer, the first motor efficiency of the electric trailer, the second output torque of the electric trailer, the second motor speed of the electric trailer, and the second motor efficiency of the electric trailer; The simulation model is obtained by integrating the sixth functional relationship between motor speed and vehicle speed, wheel radius, and speed ratio, the seventh functional relationship between the distributed torque of the electric trailer and the total torque demand of the pure electric heavy truck, and the torque distribution ratio, the eighth functional relationship between the distributed torque of the electric trailer and the total torque demand of the pure electric heavy truck, and the torque distribution ratio, the ninth functional relationship between the motor efficiency and the output torque of the motor, and the motor speed, and the fifth functional relationship; wherein the simulation model is used to characterize the functional relationship between the total motor efficiency of the pure electric heavy truck and the total torque demand of the pure electric heavy truck, the vehicle speed, and the torque distribution ratio.

3. The method according to claim 1, characterized in that After distributing the torque between the electric tug and the electric trailer according to the target distribution ratio, the method further includes: When the change in the remaining power of the electric trailer reaches a preset change threshold, the step of correcting the initial allocation ratio according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment is performed again.

4. The method according to claim 1, characterized in that: Distributing torque between the electric tug and the electric trailer according to the target distribution ratio includes: Calculating the distribution torque of the electric tractor and the distribution torque of the electric trailer according to the target distribution ratio and the torque demand; When the distributed torque of any one of the electric tractor and the electric trailer exceeds the limited torque of the vehicle, the limited torque is used as the corrected distributed torque of the vehicle; Calculating a difference between the distributed torque of the vehicle and the limit torque, and taking a sum of the difference and the distributed torque of another vehicle as a corrected distributed torque of the other vehicle; Torque distribution is performed on the electric tractor according to the corrected distributed torque of the electric tractor, and torque distribution is performed on the electric trailer according to the corrected distributed torque of the electric trailer.

5. The method according to claim 1, characterized in that The method further comprises: When the first remaining power of the electric tug at the current moment is less than or equal to a preset threshold, the lower limit value of the preset distribution range is determined as the current distribution ratio, and torque is distributed between the electric tug and the electric trailer according to the current distribution ratio.

6. A torque distribution device for a pure electric heavy truck, characterized in that: The device is used to execute the method according to any one of claims 1 to 5; the pure electric heavy truck includes an electric trailer and an electric trailer; the device includes a search module, a correction module and an allocation module; wherein, The search module is used to search for the torque demand corresponding to the pedal position at the current moment and the vehicle speed at the current moment from the MAP table corresponding to the driving mode at the current moment when the pure electric heavy truck is started; wherein different driving modes correspond to different MAP tables, and each MAP table is used to record the torque demand under different pedal positions and vehicle speeds; The search module is further used to search for an initial distribution ratio that matches the vehicle speed at the current moment and the torque demand from a pre-established torque distribution table; wherein the pre-established torque distribution table is used to record the optimal torque distribution ratio of the electric trailer and the electric trailer of the pure electric heavy truck under different vehicle speeds and torque demands; the torque distribution ratio under each record is obtained by simulation analysis of the pure electric heavy truck; The correction module is used to correct the initial allocation ratio according to the first remaining power of the electric trailer at the current moment and the second remaining power of the electric trailer at the current moment when the first remaining power of the electric trailer at the current moment is greater than a preset threshold, so as to ensure that the charge state between the battery on the electric trailer and the battery on the electric trailer is balanced; The correction module is further used to limit the corrected allocation ratio obtained after correction, so that the target allocation ratio after limitation meets the preset allocation range; The distribution module is used to distribute torque to the electric tug and the electric trailer according to the target distribution ratio.

7. A torque distribution device for a pure electric heavy truck, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 5 when executing the program.

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