Same-bridge isomerism double electric drive bridge assembly, torque distribution method and system

Abstract

The application discloses a same-bridge different-isomer double-electric-drive bridge assembly, a torque distribution method and system. The assembly comprises a double-motor electric-drive bridge and a single-motor electric-drive bridge, the double-motor electric-drive bridge is provided with a first motor and a second motor which are connected to a first differential through a fixed-speed-ratio reduction mechanism and a multi-gear transmission mechanism respectively, and the single-motor electric-drive bridge is provided with a third motor which is connected to a second differential through a multi-gear transmission mechanism. The method comprises the following steps: obtaining reference data according to three-motor parameters and bridge speed ratio; dividing torque distribution into multiple control situations according to the priority working order and the current gear of the double-motor electric-drive bridge and the single-motor electric-drive bridge which dynamically change with working conditions, determining three-motor torque instructions through segmented multi-scene control and correcting in combination with a temperature compensation coefficient. Through the same-bridge different-isomer configuration, the structure is simplified, one set of gear shifting mechanism is reduced, power interruption and deviation are avoided, efficient area operation, over-temperature protection and double-bridge life balance are considered, and the economy and reliability of the whole vehicle are improved.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, and in particular to a dual electric drive axle assembly with heterogeneous design on the same axle, a torque distribution method and system. Background Technology

[0002] Currently, with the gradual promotion and market application of electric commercial vehicles, the number of vehicles equipped with electric drive axles is also increasing. For multi-motor electric drive axle assemblies used in electric drive axle vehicles, how each motor is mechanically connected and outputs power, its configuration, and how the torque of each motor is distributed are currently hot topics of research and discussion in the industry.

[0003] When designing a dual-electric drive axle assembly, how to balance the axle structure and weight, and how to better adapt to more working conditions; at the same time, how to improve the efficiency of the motor and enhance the overall vehicle economy by rationally distributing the motor torque based on a specific configuration is a current research hotspot.

[0004] Regarding the configuration of the dual electric drive axle powertrain, existing solutions (such as publication number CN117021920A) disclose a dual-motor electric drive axle, in which the first motor is connected to a two-speed transmission and the second motor is connected to a reducer, and the two motors merge in the differential assembly.

[0005] Another option (such as publication number CN118494066A) adopts a cross-bridge heterogeneous configuration of "one motor on the first bridge and two motors on the second bridge";

[0006] Another solution (such as CN115848161A) discloses a dual-axle drive electric axle vehicle and a multi-motor control system, in which two motors are arranged on the first electric axle and the second electric axle. The electronic control unit determines the working sequence by sorting the four motors according to their torque magnitude and switches between different control modes according to the required torque magnitude.

[0007] Regarding heterogeneous hardware on the same axle, if both motors use multi-speed gearboxes, the axle assembly needs to be equipped with multiple shifting mechanisms, resulting in a bulky structure, high weight, and high cost. If both motors use single-speed reducers, it is difficult to change the motor's operating point by shifting gears. If both motors share a single multi-speed gearbox, power interruption will occur during gear shifting.

[0008] In addition, different bridges have different numbers of motors and speed ratios. If the segmentation method of average distribution or fixed sorting based solely on the required torque is used, some motors will deviate from the high-efficiency range due to differences in the speed ratio at the rear end, or long-term high load will lead to overheating or uneven wear between the two bridges.

[0009] Therefore, there is a need for a dual electric drive axle assembly with heterogeneous design and torque distribution that balances structural simplification and efficient torque distribution, in order to solve the aforementioned technical problems. Summary of the Invention

[0010] The main purpose of this application is to provide a dual electric drive axle assembly with heterogeneous structure, a torque distribution method and system, which aims to solve the technical problems of power interruption during gear shifting, vehicle deviation, motor deviation from the high-efficiency range, overheating and uneven life of the two axles caused by the structural heterogeneity of the dual electric drive axle in the prior art.

[0011] To achieve the above objectives, in a first aspect, this application proposes a dual electric drive bridge assembly with heterogeneous structure within the same bridge, comprising:

[0012] A dual-motor electric drive axle and a single-motor electric drive axle, wherein the dual-motor electric drive axle and the single-motor electric drive axle constitute a dual-motor electric drive axle powertrain;

[0013] The dual-motor electric drive axle is equipped with a first motor and a second motor. The first motor is connected to the first differential through a fixed speed ratio reduction mechanism, and the second motor is connected to the first differential through a multi-speed transmission mechanism. The output end of the first differential is used to drive the wheels of the corresponding axle.

[0014] The single-motor electric drive axle is equipped with a third motor, which is connected to the second differential through a multi-speed transmission mechanism. The output of the second differential is used to drive the wheels of the corresponding axle.

[0015] Secondly, this application proposes a torque distribution method applied to the same-axle heterogeneous dual electric drive axle assembly as described in the first aspect, comprising the following steps:

[0016] Based on the motor parameter information and electric drive axle speed ratio information of the target assembly, reference data based on motor speed is obtained, wherein the reference data includes the reference torque T of the dual-motor electric drive axle. base1 Single motor electric drive axle reference torque T base2， and the reference torque T corresponding to the first motor, the second motor, and the third motor respectively. base_MCM T base_MCMT T base_MCRT ;

[0017] Identify the control status of the target assembly based on the priority operating sequence of the electric drive axle and the current gear information of the electric drive axle;

[0018] Based on the target assembly's required torque, temperature information, and the aforementioned reference data, the first motor, second motor, and third motor are subjected to multi-parameter segmented torque distribution that matches the control conditions of the target assembly.

[0019] Further, the control scenarios include dual-motor electric drive axle priority and in 1st gear drive, dual-motor electric drive axle priority and in 2nd gear drive, single-motor electric drive axle priority and in 1st gear drive, and single-motor electric drive axle priority and in 2nd gear drive. The method for multi-parameter segmented torque allocation to the first motor, second motor, and third motor, matching the control scenarios of the target assembly with the required torque, temperature information, and the reference data of the target assembly, includes:

[0020] The system is segmented based on benchmark reference data and multiple preset allocation coefficients to obtain multiple segmented intervals and determine the target interval corresponding to the required torque.

[0021] Based on the temperature information, a temperature coefficient is obtained. Based on the temperature coefficient and the allocation coefficient, torque commands corresponding to the first motor, the second motor, and the third motor are generated respectively, so that the first motor, the second motor, and the third motor all operate in the high-efficiency zone.

[0022] Furthermore, each of the control scenarios corresponds to six preset allocation coefficients, which include a first allocation coefficient to a sixth allocation coefficient that increases sequentially. The method of segmenting the data based on the reference data and the preset allocation coefficients to obtain multiple segmented intervals and determining the target interval corresponding to the required torque includes:

[0023] The first to sixth distribution coefficients are respectively compared with the reference torque T of the dual-motor electric drive axle. base1 Multiply the results to obtain six products that construct the first to sixth segment intervals. The first segment interval is greater than 0 and less than the first allocation coefficient and the dual-motor electric drive axle reference torque T. base1 The product of the ... base1 The product of the two is less than the sixth distribution factor and the reference torque T of the dual-motor electric drive axle. base1 The product;

[0024] The required torque is compared with the six products, and the segmented interval in which the required torque is located is taken as the target interval.

[0025] Furthermore, in each of the control scenarios, the three motors will be assigned different selection priorities, wherein the selection priorities include first selection, second selection, and third selection;

[0026] The method for obtaining a temperature coefficient based on the temperature information, and generating torque commands corresponding to the first motor, the second motor, and the third motor based on the temperature coefficient and the allocation coefficient, so that the first motor, the second motor, and the third motor all operate in the high-efficiency zone, includes:

[0027] For the first segment interval and the second segment interval, if the motor with the first priority is selected, the torque output is a torque command that is the product of the required torque and the maximum allocation coefficient corresponding to the interval; if the motor with the second priority is selected, the torque output is a torque command that is the product of the required torque and 1 minus the maximum allocation coefficient corresponding to the interval; if the motor with the third priority is selected, the torque output is a torque command that is 0.

[0028] For the third and fourth segment intervals, to select the motor with the first priority, the allocated torque output is the torque command that is the product of the required torque, the maximum allocation coefficient corresponding to the interval, and the temperature coefficient corresponding to the interval. To select the motor with the second priority, the allocated torque output is the torque command that is the torque command that is the product of the required torque, 1 minus the maximum allocation coefficient corresponding to the interval, and 1 minus the temperature coefficient corresponding to the interval. To select the motor with the third priority, the allocated torque output is a torque command that is 0.

[0029] For the fifth segment interval, the motor allocation coefficients corresponding to the motors with the first and second selection priorities are obtained, and torque allocation is performed in combination with the temperature coefficient and the allocation coefficient.

[0030] For the sixth segment interval, the motor allocation coefficients corresponding to the three additional motors are obtained, and the torque is allocated in combination with the temperature coefficient and the allocation coefficient.

[0031] Furthermore, for the fifth segment interval, the method of additionally obtaining the motor allocation coefficients corresponding to the motors with selection priorities of first and second selection, and combining the temperature coefficient and the allocation coefficients to perform torque allocation includes:

[0032] To select the motor with the highest priority, the torque output is allocated to the dual-motor electric drive axle reference torque T. base1 The torque command is the product of the motor distribution coefficient and the corresponding temperature coefficient for that range.

[0033] To select the motor with the second priority, the allocated torque output is the dual-motor electric drive bridge reference torque T. base1 The torque command is the product of the motor distribution coefficient of the motor and 1 minus the corresponding temperature coefficient of the range.

[0034] To select the motor with the third priority, the allocated torque output is the difference between the required torque and the torque commands of the motors with the first and second priority.

[0035] Furthermore, the method for obtaining motor allocation coefficients for three additional motors in the sixth segment interval, and then performing torque allocation in combination with the temperature coefficient and the allocation coefficients, includes:

[0036] Based on the proportion of each motor's base torque in the sum of the base torques of the three motors, the normalized weighting coefficients corresponding to the first motor, the second motor, and the third motor are determined respectively.

[0037] For each of the three motors, the torque output is assigned as the torque command obtained by multiplying the sum of the first product and the second product by the temperature coefficient corresponding to that motor, where the first product is the reference torque T of the dual-motor electric drive bridge. base1 The product of the motor's motor distribution coefficient and the second product is the single-motor electric drive axle reference torque T. base2 The product of the motor's normalized weighting coefficient.

[0038] Thirdly, this application proposes a torque distribution system, comprising:

[0039] The reference data acquisition module is used to acquire reference data based on the motor speed according to the motor parameter information and electric drive axle speed ratio information of the target assembly. The reference data includes the reference torque T of the dual-motor electric drive axle. base1 Single motor electric drive axle reference torque T base2 and the reference torque T corresponding to the first motor, the second motor, and the third motor respectively. base_MCM T base_MCMT T base_MCRT ;

[0040] The control status identification module is used to identify the control status of the target assembly based on the priority working sequence of the electric drive axle and the current gear information of the electric drive axle.

[0041] The multi-parameter segmented torque distribution module is used to perform multi-parameter segmented torque distribution on the first motor, the second motor, and the third motor according to the target assembly's required torque, temperature information, and the reference data, matching the control conditions of the target assembly.

[0042] Fourthly, this application provides an electronic device comprising: a memory, a processor, and a torque distribution program stored in the memory and executable on the processor, the torque distribution program being configured to implement the steps of the method as described in any one of the second aspects.

[0043] Fifthly, this application proposes a vehicle including a dual electric drive axle assembly with heterogeneous configuration as described in the first aspect, and also including a torque distribution system as described in the third aspect or electronic equipment as described in the fourth aspect.

[0044] The dual electric drive axle assembly with heterogeneous configuration and torque distribution method and system provided in this application have the following beneficial effects:

[0045] Compared to the scheme where each of the two motors is equipped with a multi-speed transmission mechanism, the same-bridge heterogeneous scheme reduces one shifting mechanism, resulting in a simpler structure, lower weight and cost, and improved reliability.

[0046] Compared to the solution where both motors are equipped with single-speed reducers, the operating point of the motor can be changed by switching gears, thus balancing low-speed high-torque power with high-speed cruising economy.

[0047] Compared to the dual-motor system that shares a single multi-speed transmission, the single-speed motor has no shift interruption and can respond quickly during rapid acceleration, avoiding torque delay caused by re-shifting; because both ends use differential outputs, it solves the problem of vehicle deviation during shifting caused by heterogeneous axle and control algorithms.

[0048] In terms of torque distribution, the dual-axle priority working sequence changes dynamically with the working conditions and the current gear is divided into control situations. In each situation, segmented multi-scenario control is carried out in combination with the required torque and temperature information, so that all three motors operate in the high-efficiency range, preventing excessive wear caused by the fixed working conditions of the single axle and achieving balanced life of the dual axles. Attached Figure Description

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0050] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a structural schematic diagram of an embodiment of the heterogeneous dual electric drive bridge assembly in this application;

[0052] Figure 2 This is a schematic flowchart of an embodiment of the torque distribution method in this application;

[0053] Figure 3 This is a schematic diagram of a structure provided for an embodiment of the torque distribution system in this application;

[0054] Figure 4 This is a schematic diagram of the structure of an embodiment of the electronic device in this application.

[0055] Explanation of icon numbers:

[0056] 1. Dual-motor electric drive bridge; 2. Single-motor electric drive bridge; 3. First motor; 4. Second motor; 5. Fixed speed ratio reduction mechanism; 6. First differential; 7. Multi-speed transmission mechanism; 8. Third motor; 9. Second differential; 10. Memory; 20. Processor.

[0057] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0058] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0059] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0060] Example 1

[0061] This application provides a heterogeneous dual electric drive bridge assembly with the same bridge configuration, referring to... Figure 1 ,include:

[0062] The dual-motor electric drive bridge 1 and the single-motor electric drive bridge 2 constitute a dual-motor electric drive bridge powertrain.

[0063] The dual-motor electric drive axle is equipped with a first motor 3 and a second motor 4. The first motor is connected to a first differential 6 through a fixed speed ratio reduction mechanism 5, and the second motor 4 is connected to the first differential 6 through a multi-speed transmission mechanism 7. The output end of the first differential 6 is used to drive the wheels of the corresponding axle.

[0064] The single-motor electric drive axle 2 is equipped with a third motor 8, which is connected to a second differential 9 via a multi-speed transmission mechanism 7. The output of the second differential 9 is used to drive the wheels of the corresponding axle.

[0065] Specifically, the powertrain facing the dual-motor electric drive axle has two drive motors. The single-motor electric drive axle has one drive motor. One motor on the dual-motor electric drive axle is connected to the wheel end through a 2-speed transmission mechanism, and the other motor is connected to the wheel end through a fixed speed ratio reduction mechanism. After the two are combined, they are connected to the wheel end through a differential.

[0066] The motor on the single-motor electric drive axle is connected to the differential via a two-speed transmission mechanism, and then to the wheel end to achieve power output.

[0067] Compared to the scheme where each of the two motors has a set of two-speed transmission mechanisms, this implementation is a heterogeneous scheme with the same bridge, which optimizes the problem of the bulky and complex bridge assembly structure, reduces one set of two-speed transmission mechanisms, achieves structural simplification, reduces the weight of the bridge assembly and reduces costs, reduces one set of shift control mechanisms, reduces the number of parts and shift control complexity, and improves reliability.

[0068] Compared to two motors each having a single reduction mechanism, this implementation can adapt to more working conditions by switching gears, changing the motor's operating point, optimizing efficiency, and the included two-speed transmission mechanism can achieve better overall vehicle power in the low gear, balancing economy and power.

[0069] The dual electric drive axle assembly with heterogeneous structure in the same axle of this embodiment, compared with the prior art, completely borrows a set of 2-speed transmission mechanism for both motors. During the shifting process, it can avoid power interruption during shifting, optimize the driving experience of the vehicle. In the case of rapid acceleration, the motor with single reduction structure can respond quickly, avoiding the problem of motor torque delay caused by the need to re-shift in the prior art, and poor acceleration feel.

[0070] This dual electric drive axle assembly solves the problem of vehicle deviation during gear shifts caused by heterogeneous axle configurations and control algorithms in distributed drive systems, since the outputs at the rear are all via differentials.

[0071] By adopting this implementation method, by adjusting the power of the motor and combining different speed ratios, it is also possible to achieve the same torque amplification under strong power as a multi-speed solution, thus meeting the vehicle's power requirements.

[0072] Example 2

[0073] This application also provides a torque distribution method applied to the same-bridge heterogeneous dual electric drive axle assembly as described in Embodiment 1, such as... Figure 2 As shown, it includes the following steps:

[0074] Step S1: Based on the motor parameter information and electric drive axle speed ratio information of the target assembly, obtain reference data based on the motor speed, wherein the reference data includes the reference torque T of the dual-motor electric drive axle. base1 Single motor electric drive axle reference torque T base2，and the reference torque T corresponding to the first motor, the second motor, and the third motor respectively. base_MCM T base_MCMT T base_MCRT ;

[0075] Step S2: Identify the control status of the target assembly based on the priority working sequence of the electric drive axle and the current gear information of the electric drive axle;

[0076] Step S3: Based on the target assembly's required torque, temperature information, and the reference data, perform multi-parameter segmented torque distribution on the first motor, second motor, and third motor to match the control conditions of the target assembly.

[0077] In this implementation method, since the number of motors in the two electric drive axles is different, the power configuration between different axles is different, and the configuration between the same axle is also different, the priority order of the two electric drive axles is not fixed and is changing when distributing motor torque. In certain scenarios, the dual-motor electric drive axle works first, and in certain scenarios, the single-motor electric drive axle works first, which can adapt to driving road conditions in light load and economic mode.

[0078] It can also meet the requirements of power mode, high speed, heavy load climbing and other working conditions. It can also better avoid the problem of inconsistent wear or even excessive wear of a single axle caused by the fixed working conditions or fixed purpose of a single axle. It can better balance the life of the two axles, improve durability and improve the reliability of the whole vehicle. At the same time, based on the refinement of multiple parameters and temperature coefficient correction compensation, it can solve the problem of shutdown or breakdown caused by overheating or abnormal temperature, and better adapt to multiple working conditions.

[0079] Furthermore, in one specific embodiment of this application, the following steps are included:

[0080] Step S100: Based on the parameter information of the three motors of the current powertrain and the speed ratio information of the electric drive axle, obtain the reference data T based on the motor speed. base1 T base2 T base_MCM T base_MCMT T base_MCRT ;

[0081] A schematic diagram of the heterogeneous dual electric drive bridge assembly is shown above. Figure 1 As shown, the two electric drive bridges are divided into a dual-motor electric drive bridge and a single-motor electric drive bridge;

[0082] The dual-motor electric drive bridge has two motors, namely motors. -MCM and motor -MCMT motor -MCM Connect a fixed speed ratio reduction mechanism (speed ratio R1) to the motor. -MCMT Connect to a 2-speed transmission mechanism (1st gear ratio R)M1 2nd gear ratio R M2 After the power of the two is combined, it is connected to the wheel ends through the differential;

[0083] The single-motor electric drive bridge has one motor, which is the motor. -MCRT motor -MCRT Through a 2-speed transmission mechanism (1st gear ratio R) R1 2nd gear ratio R R2 ), connected to the wheel ends via the differential;

[0084] Based on the current motor parameters and speed ratio information (R1, R... M1 R M2 R R1 R R2 ), obtain benchmark reference data T base1 T base2 T base_MCM T base_MCMT T base_MCRT ;

[0085] Step S200: Based on the priority working order of the electric drive bridge and the current gear information of the electric drive bridge, identify different control situations, which are divided into four situations: "dual motor electric drive bridge working first, driving in 1st gear", "dual motor electric drive bridge working first, driving in 2nd gear", "single motor electric drive bridge working first, driving in 1st gear", and "single motor electric drive bridge working first, driving in 2nd gear".

[0086] Because the power structures of the two axles are different, the configurations of the two electric motors in a single axle are also different. When performing torque distribution control, the priority order of the two electric drive axles is not fixed and is variable. It is divided into dual-motor electric drive axle priority drive and single-motor electric drive axle priority drive. This can take into account both economy and power, while better protecting the life of the two axles and preventing excessive wear.

[0087] At the same time, based on the gear status of the dual-motor electric drive bridge and the single-motor electric drive bridge, whether it is gear 1 or gear 2, the cases are divided into the above 4 cases. Then, under different cases, the torque distribution of the three motors is also different, and further segmented and refined control is performed.

[0088] Meanwhile, due to differences in speed ratio and motor parameters, if a fixed control mode of single motor, dual motor, or triple motor is still used, or if an average distribution or a fixed ratio distribution is used, it may cause some motors to have lower output torque and lower motor load rate due to different speed ratios at the rear end, resulting in poor economy, or cause the motor output torque to be consistently high, resulting in excessive load rate, overheating, or failure.

[0089] By adopting this implementation method, based on the speed ratio information of the connection mechanism at the rear end of each motor and combined with the motor parameters, it is possible to prevent the problem of low motor load rate and poor economy caused by different rear speed ratio information of a single motor, and also to prevent the problem of overheating or failure caused by excessive motor load rate. At the same time, it can ensure that each motor operates in the high-efficiency range in more scenarios, thereby improving the economy of the whole vehicle.

[0090] Step S300: Under different conditions, based on the required torque, combined with temperature information and reference data T base1 T base2 T base_MCM T base_MCMT T base_MCRT By using multiple parameters to perform segmented multi-scenario control of the torque distribution of the three motors, a complete motor torque distribution method is formed, thereby realizing the control of the torque of the three motors.

[0091] This implementation method allows for single-motor operation under low torque and multi-motor operation under high torque, which is suitable for economy mode and low torque conditions, as well as better suited for climbing and high-speed cruising. At the same time, under certain conditions, the operation and disengagement of another motor with gears can further improve fuel economy. When high torque is required, it can intervene in a timely manner to quickly meet the vehicle's needs.

[0092] At the same time, correction and compensation are made based on temperature parameters to avoid long-term operation under specific conditions when using a single bridge in a fixed working condition or a single bridge with a fixed control method. This can cause a single bridge or a motor on a bridge to work for a long time, and the motor's operating point to exceed the high-efficiency range, resulting in abnormal temperature, which can lead to reduced vehicle power or breakdown. This can reduce the impact of motor overheating and improve vehicle reliability.

[0093] The priority order of the two electric drive axles is not fixed and can be changed, which can better avoid excessive wear of a single axle, balance the life and durability of the two axles, and improve the reliability of the whole vehicle.

[0094] It can also better adjust the motor's working priority and torque according to different working conditions, so as to improve the motor's load rate, optimize the motor's working range, and improve the overall power performance while ensuring sufficient power.

[0095] More precise control makes the vehicle more adaptable. Under different working conditions and loads, the motor torque distribution is more reasonable, the motor efficiency is higher, and the vehicle is more economical.

[0096] Furthermore, in one specific implementation, under the scenario of "dual-motor electric drive axle prioritizing operation, driving in 1st gear," where the dual-motor electric drive axle prioritizes operation and the vehicle is currently in 1st gear, torque distribution is performed as follows: The specific control allocation of the three motors is as follows:

[0097] (1) Total required torque T req Less than K 11 ·T base1 :

[0098] Obtain the temperature coefficient k based on temperature information. T11 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is 0, and the motors on the dual-motor electric drive axle are... -MCMT The torque command is T req ·k T11 Single motor electric drive bridge motor -MCRT The torque command is T req ·(1-k T11 );

[0099] (2) Total required torque T req Greater than or equal to K 11 ·T base1 Less than K 12 ·T base1 :

[0100] Obtain the temperature coefficient k based on temperature information. T12 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is 0, and the motors on the dual-motor electric drive axle are... -MCMT The torque command is T req ·k T12 Single motor electric drive bridge motor -MCRT The torque command is T req ·(1-k T12 );

[0101] (3) Total required torque T req Greater than or equal to K 12 ·T base1 Less than K 13 ·T base1 :

[0102] Its allocation coefficient is k 13 ;

[0103] Then, the temperature coefficient k is obtained based on the temperature information. T13 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is 0, and the motors on the dual-motor electric drive axle are... -MCMT The torque command is T req ·k 13 ·k T13 Single motor electric drive bridge motor -MCRT The torque command is T req ·(1-k 13 )·(1-k T13 );

[0104] (4) Total required torque T req Greater than or equal to K 13 ·T base1 Less than K 14 ·T base1 :

[0105] Its allocation coefficient is k 14 ;

[0106] Then, the temperature coefficient k is obtained based on the temperature information. T14 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is 0, and the motors on the dual-motor electric drive axle are... -MCMT The torque command is T req ·k 14 ·k T14 Single motor electric drive bridge motor -MCRT The torque command is T req ·(1-k 14 )·(1-k T14 );

[0107] (5) Total required torque T req Greater than or equal to K 14 ·T base1 Less than K 15 ·T base1 :

[0108] Its allocation coefficient is k 15_MCMT k 15_MCRT ;

[0109] Then, the temperature coefficient k is obtained based on the temperature information. T15 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req -T base1 ·k 15_MCMT ·k T15 -T base1 ·k 15_MCRT ·(1-k T15 Dual-motor electric drive bridge motor -MCMT The torque command is T base1 ·k 15_MCMT ·k T15 Single motor electric drive bridge motor -MCRT The torque command is T base1 ·k 15_MCRT ·(1-k T15 );

[0110] (6) Total required torque T req Greater than or equal to K 15 ·T base1 Less than K 16·T base1 :

[0111] Its allocation coefficient is k 16_MCM k 16_MCMT k 16_MCRT And calculate N _MCM N _MCMT N _MCRT The calculation method is as follows:

[0112] N _MCM =T base_MCM / (T base_MCM +T base_MCMT +T base_MCRT );

[0113] N _MCMT =T base_MCMT / (T base_MCM +T base_MCMT +T base_MCRT );

[0114] N _MCRT =T base_MCRT / (T base_MCM +T base_MCMT +T base_MCRT );

[0115] Obtain the temperature coefficient k based on temperature information. T16_MCM k T16_MCMT k T16_MCRT Then the dual-motor electric drive bridge motor -MCM The torque command is (T) base1 ·k 16_MCM +N _MCM ·T base2 )·k T16_MCM Dual-motor electric drive bridge motor -MCMT The torque command is (T) base1 ·k 16_MCMT +N _MCMT ·T base2 )·k T16_MCMT Single motor electric drive bridge motor -MCRT The torque command is (T) base1 ·k 16_MCRT +N _MCRT ·T base2 )·k T16_MCRT .

[0116]

[0117] In the "dual-motor electric drive axle priority, 2nd gear drive" scenario, the dual-motor electric drive axle takes priority and the vehicle is currently in 2nd gear. Torque distribution is performed according to the following conditions, and the specific control distribution of the three motors is as follows:

[0118] (1) Total required torque T req Less than K 21 ·T base1 :

[0119] Obtain the temperature coefficient k based on temperature information. T21 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req ·k T21 Dual-motor electric drive bridge motor -MCMT The torque command is T req ·(1-k T21 Single motor electric drive bridge motor -MCRT The torque command is 0;

[0120] (2) Total required torque T req Greater than or equal to K 21 ·T base1 Less than K 22 ·T base1 :

[0121] Obtain the temperature coefficient k based on temperature information. T22 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req ·k T22 Dual-motor electric drive bridge motor -MCMT The torque command is T req ·(1-k T22 Single motor electric drive bridge motor -MCRT The torque command is 0;

[0122] (3) Total required torque T req Greater than or equal to K 22 ·T base1 Less than K 23 ·T base1 :

[0123] Its allocation coefficient is k 23 ;

[0124] Obtain the temperature coefficient k based on temperature information. T23 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req ·k 23 ·k T23 Dual-motor electric drive bridge motor -MCMT The torque command is T req ·(1-k 23 )·(1-k T23 Single motor electric drive bridge motor -MCRT The torque command is 0;

[0125] (4) Total required torque T req Greater than or equal to K 23 ·T base1 Less than K 24 ·T base1 :

[0126] Its allocation coefficient is k 24 ;

[0127] Obtain the temperature coefficient k based on temperature information. T24 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req ·k 24 ·k T24 Dual-motor electric drive bridge motor -MCMT The torque command is T req ·(1-k 24 )·(1-k T24 Single motor electric drive bridge motor -MCRT The torque command is 0;

[0128] (5) Total required torque T req Greater than or equal to K 24 ·T base1 Less than K 25 ·T base1 :

[0129] Its allocation coefficient is k 25_MCM k 25_MCMT ;

[0130] Obtain the temperature coefficient k based on temperature information. T25 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T base1 ·k 25_MCM ·k T25 Dual-motor electric drive bridge motor -MCMT The torque command is T base1 ·k 25_MCMT ·(1-k T25 Single motor electric drive bridge motor -MCRT The torque command is T req -T base1 ·k 25_MCM ·k T15 -T base1 ·k 25_MCMT ·(1-k T25 );

[0131] (6) Total required torque T req Greater than or equal to K 25 ·T base1 Less than K26 ·T base1 :

[0132] Its allocation coefficient is k 26_MCM k 26_MCMT k 26_MCRT And calculate N _MCM N _MCMT N _MCRT The calculation method is as follows:

[0133] N _MCM =T base_MCM / (T base_MCM +T base_MCMT +T base_MCRT );

[0134] N _MCMT =T base_MCMT / (T base_MCM +T base_MCMT +T base_MCRT );

[0135] N _MCRT =T base_MCRT / (T base_MCM +T base_MCMT +T base_MCRT );

[0136] Obtain the temperature coefficient k based on temperature information. T26_MCM k T26_MCMT k T26_MCRT At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is (T) base1 ·k 26_MCM +N _MCM ·T base2 )·k T26_MCM Dual-motor electric drive bridge motor -MCMT The torque command is (T) base1 ·k 26_MCMT +N _MCMT ·T base2 )·k T26_MCMT Single motor electric drive bridge motor -MCRT The torque command is (T) base1 ·k 26_MCRT +N _MCRT ·T base2 )·k T26_MCRT ;

[0137]

[0138] In the scenario of "single motor electric drive axle priority, 1st gear drive", when the single motor electric drive axle takes priority and the vehicle is currently in 1st gear, the torque distribution is as follows: The specific control distribution of the three motors is as follows:

[0139] (1) Total required torque T req Less than K 31 ·T base1 :

[0140] Obtain the temperature coefficient k based on temperature information. T31 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is 0, and the motors on the dual-motor electric drive axle are... -MCMT The torque command is T req ·(1-k T31 Single motor electric drive bridge motor -MCRT The torque command is T req ·k T31 ;

[0141] (2) Total required torque T req Greater than or equal to K 31 ·T base1 Less than K 32 ·T base1 :

[0142] Obtain the temperature coefficient k based on temperature information. T32 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is 0, and the motors on the dual-motor electric drive axle are... -MCMT The torque command is T req ·(1-k T32 Single motor electric drive bridge motor -MCRT The torque command is T req ·k T32 ;

[0143] (3) Total required torque T req Greater than or equal to K 32 ·T base1 Less than K 33 ·T base1 :

[0144] Its allocation coefficient is k 33 ;

[0145] Obtain the temperature coefficient k based on temperature information. T33 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is 0, and the dual-motor electric drive axle motors are in operation. -MCMT The torque command is T req ·(1-k 33 )·(1-k T33Single motor electric drive bridge motor -MCRT The torque command is T req ·k 33 ·k T33 ;

[0146] (4) Total required torque T req Greater than or equal to K 33 ·T base1 Less than K 34 ·T base1 :

[0147] Its allocation coefficient is k 34 ;

[0148] Obtain the temperature coefficient k based on temperature information. T34 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is 0, and the motors on the dual-motor electric drive axle are... -MCMT The torque command is T req ·(1-k 34 )·(1-k T34 Single motor electric drive bridge motor -MCRT The torque command is T req ·k 34 ·k T34 ;

[0149] (5) Total required torque T req Greater than or equal to K 34 ·T base1 Less than K 35 ·T base1 :

[0150] Its allocation coefficient is k 35_MCMT k 35_MCRT ;

[0151] Obtain the temperature coefficient k based on temperature information. T35 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req -T base1 ·k 35_MCRT ·k T35 -T base1 ·k 35_MCMT ·(1-k T35 Dual-motor electric drive bridge motor -MCMT The torque command is T base1 ·k 35_MCMT ·(1-k T35 Single motor electric drive bridge motor -MCRT The torque command is T base1 ·k 35_MCRT ·k T35 ;

[0152] (6) Total required torque T req Greater than or equal to K 35 ·T base1 Less than K 36 ·T base1 :

[0153] Its allocation coefficient is k 36_MCM k 36_MCMT k 36_MCRT And calculate N _MCM N _MCMT N _MCRT The calculation method is as follows:

[0154] N _MCM =T base_MCM / (T base_MCM +T base_MCMT +T base_MCRT );

[0155] N _MCMT =T base_MCMT / (T base_MCM +T base_MCMT +T base_MCRT );

[0156] N _MCRT =T base_MCRT / (T base_MCM +T base_MCMT +T base_MCRT );

[0157] Obtain the temperature coefficient k based on temperature information. T36_MCM k T36_MCMT k T36_MCRT At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is (T) base1 ·k 36_MCM +N _MCM ·T base2 )·k T36_MCM Dual-motor electric drive bridge motor -MCMT The torque command is (T) base1 ·k 36_MCMT +N _MCMT ·T base2 )·k T36_MCMT Single motor electric drive bridge motor -MCRT The torque command is (T) base1 ·k 36_MCRT +N _MCRT ·T base2 )·k T36_MCRT ;

[0158]

[0159] In the scenario of "single motor electric drive axle priority, 2nd gear drive", the single motor electric drive axle takes priority and the vehicle is currently in 2nd gear. The torque distribution is as follows, and the specific control distribution of the three motors is as follows:

[0160] (1) Total required torque T req Less than K 41 ·T base1 :

[0161] Obtain the temperature coefficient k based on temperature information. T41 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req ·(1-k T31 Dual-motor electric drive bridge motor -MCMT The torque command is 0, and the motor on the single-motor electric drive axle is... -MCRT The torque command is T req ·k T41 ;

[0162] (2) Total required torque T req Greater than or equal to K 41 ·T base1 Less than K 42 ·T base1 :

[0163] Obtain the temperature coefficient k based on temperature information. T42 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req ·(1-k T42 Dual-motor electric drive bridge motor -MCMT The torque command is 0, and the motor on the single-motor electric drive axle is... -MCRT The torque command is T req ·k T42 ;

[0164] (3) Total required torque T req Greater than or equal to K 42 ·T base1 Less than K 43 ·T base1 :

[0165] Its allocation coefficient is k 43 ;

[0166] Obtain the temperature coefficient k based on temperature information. T43 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req ·(1-k 43 )·(1-k T43Dual-motor electric drive bridge motor -MCMT The torque command is 0, and the motor on the single-motor electric drive axle is... -MCRT The torque command is T req ·k 43 ·k T43 ;

[0167] (4) Total required torque T req Greater than or equal to K 43 ·T base1 Less than K 44 ·T base1 :

[0168] Its allocation coefficient is k 44 ;

[0169] Obtain the temperature coefficient k based on temperature information. T44 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T req ·(1-k 44 )·(1-k T44 Dual-motor electric drive bridge motor -MCMT The torque command is 0, and the motor on the single-motor electric drive axle is... -MCRT The torque command is T req ·k 44 ·k T44 ;

[0170] (5) Total required torque T req Greater than or equal to K 44 ·T base1 Less than K 45 ·T base1 :

[0171] Its allocation coefficient is k 45_MCM k 45_MCRT ;

[0172] Obtain the temperature coefficient k based on temperature information. T45 At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is T base1 ·k 45_MCM ·(1-k T45 Dual-motor electric drive bridge motor -MCMT The torque command is T req -T base1 ·k 45_MCRT ·k T45 -T base1 ·k 45_MCM ·(1-k T45 Single motor electric drive bridge motor -MCRT The torque command is T base1 ·k45_MCRT ·k T45 ;

[0173] (6) Total required torque T req Greater than or equal to K 45 ·T base1 Less than K 46 ·T base1 :

[0174] Its allocation coefficient is k 46_MCM k 46_MCMT k 46_MCRT And calculate N _MCM N _MCMT N _MCRT The calculation method is as follows:

[0175] N _MCM =T base_MCM / (T base_MCM +T base_MCMT +T base_MCRT );

[0176] N _MCMT =T base_MCMT / (T base_MCM +T base_MCMT +T base_MCRT );

[0177] N _MCRT =T base_MCRT / (T base_MCM +T base_MCMT +T base_MCRT );

[0178] Obtain the temperature coefficient k based on temperature information. T46_MCM k T46_MCMT k T46_MCRT At this time, the motors on the dual-motor electric drive bridge -MCM The torque command is (T) base1 ·k 46_MCM +N _MCM ·T base2 )·k T46_MCM Dual-motor electric drive bridge motor -MCMT The torque command is (T) base1 ·k 46_MCMT +N _MCMT ·T base2 )·k T46_MCMT Single motor electric drive bridge motor -MCRT The torque command is (T) base1 ·k 46_MCRT +N _MCRT ·T base2 )·k T46_MCRT .

[0179]

[0180] In this embodiment, considering the differences in bridge configuration, bridge life and reliability, a non-drive bridge non-fixed working condition operation mode is adopted, and different situations are divided. Under different situations, detailed segmented control is carried out, which can solve the excessive wear of the fixed bridge drive mode, balance the life of the beam bridge, better adapt to various working conditions, improve motor working efficiency, and prevent excessive load or excessive load.

[0181] It can adapt to various operating conditions such as low speed and low torque, low speed and high torque, high speed and low torque, high speed cruising, low speed flat road turning into slope, and high speed heavy load rapid acceleration, improving the overall vehicle economy. At the same time, it balances based on the temperature coefficient and further corrects the motor operating point to prevent overheating problems caused by long-term operation under specific conditions.

[0182] If the dual-motor electric drive axle prioritizes operation, in first gear drive mode, segmenting from 1st to 2nd gear can adapt to low-speed, low-gear, low-torque conditions. -MCMT Priority work, motor -MCRT Compensation should be made based on temperature conditions. If the temperature is normal, the motor... -MCMT Working independently, it meets the current needs for low speed and low torque. However, in cases of abnormal temperature conditions, the motor... -MCRT Compensation is performed; simultaneously, based on the increased throttle depth, the system can quickly switch to segment 3-4, utilizing k. 13 k 14 Allocation coefficient, for motor -MCMT Motor -MCRT Adjust the allocation to prevent motor -MCMT If the load is too high, adjust its working load rate. At the same time, based on the high speed ratio of the first gear, it can adapt well to low speed and high torque conditions, and is well adapted to working conditions such as turning from flat road to slope.

[0183] For example, in the "dual-motor electric drive axle priority, 2nd gear drive" mode, it can adapt well to high-speed cruising by utilizing segment 1-2, where the motors of the dual-motor electric drive axle... -MCM Priority work, motor -MCMT Compensation is performed, at which time the motor -MCRT When not in operation, the single-motor electric drive axle can be used solely as a support axle, improving the overall vehicle's fuel economy. If acceleration is required or an incline is encountered, the system can be switched to segment 3-4, utilizing the electric motor. -MCM Motor -MCMT Torque distribution is achieved through heterogeneous design of the same axle to prevent one motor from overloading and overheating, keeping both motors operating in their high-efficiency range. At this time, only the dual-motor electric drive axle is working. Only when the driver accelerates rapidly or overtakes at high speed and heavy load with full throttle, the motor of the single-motor electric drive axle also participates in the work through segment 5-6, thereby ensuring the power of the whole vehicle and adjusting the operating points of the two motors on the dual-motor electric drive axle.

[0184] For example, the "single motor electric drive axle priority, 2nd gear drive" mode can adapt well to low-speed operation and low torque conditions, mainly operating in segments 1-2, where the motor on the single motor electric drive axle is the primary driver. -MCRT Operation; under high torque, utilizing the motors on the dual-motor electric drive bridge. -MCMT The vehicle utilizes its high first gear ratio to achieve low-speed, high-torque climbing and obstacle-avoidance maneuvers, leveraging the distribution coefficient k. 33 k 34 The two motors are adjusted and corrected based on the temperature coefficient to ensure that the motors operate normally and efficiently.

[0185] For example, the segmented 1-2 under "single motor electric drive bridge priority, 2-speed drive" can also adapt well to high-speed, low-torque situations. Under normal temperature conditions, the motor can... -MCRT Individually driven, dual-motor electric drive bridge motor -MCM Temperature compensation is performed; if the driver needs to accelerate at high speed, the high-speed single-downshift mechanism can be used to quickly intervene and respond, entering segment 3-4, utilizing the motors of the dual-motor electric drive axle. -MCM Adjust the motor -MCRT Load factor should be controlled to prevent it from being too high or too low, thereby improving economic efficiency.

[0186] Meanwhile, this allocation method can calibrate and adjust various allocation coefficients based on the size of the motor matched with the dual electric drive bridge assembly, thus making it applicable to assemblies with different motor specifications and realizing the universality of the algorithm for this type of heterogeneous dual electric drive bridge assembly.

[0187] Example 3

[0188] This application proposes an embodiment of a torque distribution system, such as... Figure 3 As shown, it includes:

[0189] The reference data acquisition module is used to acquire reference data based on the motor speed according to the motor parameter information and electric drive axle speed ratio information of the target assembly. The reference data includes the reference torque T of the dual-motor electric drive axle. base1 Single motor electric drive axle reference torque T base2， and the reference torque T corresponding to the first motor, the second motor, and the third motor respectively. base_MCM T base_MCMT T base_MCRT ;

[0190] The control status identification module is used to identify the control status of the target assembly based on the priority working sequence of the electric drive axle and the current gear information of the electric drive axle.

[0191] The multi-parameter segmented torque distribution module is used to perform multi-parameter segmented torque distribution on the first motor, the second motor, and the third motor according to the target assembly's required torque, temperature information, and the reference data, matching the control conditions of the target assembly.

[0192] Example 4

[0193] This application proposes an electronic device, the device comprising: a memory, a processor, and a torque distribution program stored in the memory and executable on the processor, the torque distribution program being configured to implement the steps of the method as described in Embodiment 2.

[0194] Example 5

[0195] This application proposes a vehicle characterized by including a dual electric drive axle assembly with heterogeneous configuration as described in Embodiment 1, and further including a torque distribution system as described in Embodiment 3 or an electronic device as described in Embodiment 4.

[0196] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A dual electric drive bridge assembly with heterogeneous structure and same bridge configuration, characterized in that, include: A dual-motor electric drive axle and a single-motor electric drive axle, wherein the dual-motor electric drive axle and the single-motor electric drive axle constitute a dual-motor electric drive axle powertrain; The dual-motor electric drive axle is equipped with a first motor and a second motor. The first motor is connected to the first differential through a fixed speed ratio reduction mechanism, and the second motor is connected to the first differential through a multi-speed transmission mechanism. The output end of the first differential is used to drive the wheels of the corresponding axle. The single-motor electric drive axle is equipped with a third motor, which is connected to the second differential through a multi-speed transmission mechanism. The output of the second differential is used to drive the wheels of the corresponding axle.

2. A torque distribution method, characterized in that, The method applied to the heterogeneous dual electric drive bridge assembly as described in claim 1 includes the following steps: Based on the motor parameter information and electric drive axle speed ratio information of the target assembly, reference data based on motor speed is obtained, wherein the reference data includes the reference torque T of the dual-motor electric drive axle. base1 Single motor electric drive axle reference torque T base2， and the reference torque T corresponding to the first motor, the second motor, and the third motor respectively. base_MCM T base_MCMT T base_MCRT ; Identify the control status of the target assembly based on the priority operating sequence of the electric drive axle and the current gear information of the electric drive axle; Based on the target assembly's required torque, temperature information, and the aforementioned reference data, the first motor, second motor, and third motor are subjected to multi-parameter segmented torque distribution that matches the control conditions of the target assembly.

3. The torque distribution method as described in claim 2, characterized in that, The control scenarios include dual-motor electric drive axle priority and in 1st gear drive, dual-motor electric drive axle priority and in 2nd gear drive, single-motor electric drive axle priority and in 1st gear drive, and single-motor electric drive axle priority and in 2nd gear drive. The method for multi-parameter segmented torque allocation to the first motor, second motor, and third motor, matching the control scenarios of the target assembly based on the target assembly's required torque, temperature information, and the reference data, includes: The system is segmented based on benchmark reference data and multiple preset allocation coefficients to obtain multiple segmented intervals and determine the target interval corresponding to the required torque. Based on the temperature information, a temperature coefficient is obtained. Based on the temperature coefficient and the allocation coefficient, torque commands corresponding to the first motor, the second motor, and the third motor are generated respectively, so that the first motor, the second motor, and the third motor all operate in the high-efficiency zone.

4. The torque distribution method as described in claim 3, characterized in that, Each of the control scenarios corresponds to six preset allocation coefficients, which include a first allocation coefficient to a sixth allocation coefficient that increases sequentially. The method of segmenting the data based on the reference data and the preset allocation coefficients to obtain multiple segmented intervals and determining the target interval corresponding to the required torque includes: The first to sixth distribution coefficients are respectively compared with the reference torque T of the dual-motor electric drive axle. base1 Multiply the results to obtain six products that construct the first to sixth segment intervals. The first segment interval is greater than 0 and less than the first allocation coefficient and the dual-motor electric drive axle reference torque T. base1 The product of the ... base1 The product of the two is less than the sixth distribution factor and the reference torque T of the dual-motor electric drive axle. base1 The product; The required torque is compared with the six products, and the segmented interval in which the required torque is located is taken as the target interval.

5. The torque distribution method as described in claim 4, characterized in that, In each of the control scenarios, the three motors will be assigned different selection priorities, including first selection, second selection, and third selection. The method for obtaining a temperature coefficient based on the temperature information, and generating torque commands corresponding to the first motor, the second motor, and the third motor based on the temperature coefficient and the allocation coefficient, so that the first motor, the second motor, and the third motor all operate in the high-efficiency zone, includes: For the first segment interval and the second segment interval, if the motor with the first priority is selected, the torque output is a torque command that is the product of the required torque and the maximum allocation coefficient corresponding to the interval; if the motor with the second priority is selected, the torque output is a torque command that is the product of the required torque and 1 minus the maximum allocation coefficient corresponding to the interval; if the motor with the third priority is selected, the torque output is a torque command that is 0. For the third and fourth segment intervals, to select the motor with the first priority, the allocated torque output is the torque command that is the product of the required torque, the maximum allocation coefficient corresponding to the interval, and the temperature coefficient corresponding to the interval. To select the motor with the second priority, the allocated torque output is the torque command that is the torque command that is the product of the required torque, 1 minus the maximum allocation coefficient corresponding to the interval, and 1 minus the temperature coefficient corresponding to the interval. To select the motor with the third priority, the allocated torque output is a torque command that is 0. For the fifth segment interval, the motor allocation coefficients corresponding to the motors with the first and second selection priorities are obtained, and torque allocation is performed in combination with the temperature coefficient and the allocation coefficient. For the sixth segment interval, the motor allocation coefficients corresponding to the three additional motors are obtained, and the torque is allocated in combination with the temperature coefficient and the allocation coefficient.

6. The torque distribution method as described in claim 5, characterized in that, For the fifth segment interval, the method of additionally obtaining the motor allocation coefficients corresponding to the motors with selection priorities of first and second selection, and combining the temperature coefficient and the allocation coefficients to perform torque allocation includes: To select the motor with the highest priority, the torque output is allocated to the dual-motor electric drive bridge reference torque T. base1 The torque command is the product of the motor distribution coefficient of the motor and the corresponding temperature coefficient in the range. To select the motor with the second priority, the allocated torque output is the dual-motor electric drive bridge reference torque T. base1 The torque command is the product of the motor distribution coefficient of the motor and 1 minus the corresponding temperature coefficient of the range. To select the motor with the third priority, the allocated torque output is the difference between the required torque and the torque commands of the motors with the first and second priority.

7. The torque distribution method as described in claim 5, characterized in that, The method for obtaining motor allocation coefficients for three additional motors in the sixth segment interval, and then allocating torque based on the temperature coefficient and the allocation coefficients, includes: Based on the proportion of each motor's base torque in the sum of the base torques of the three motors, the normalized weighting coefficients corresponding to the first motor, the second motor, and the third motor are determined respectively. For each of the three motors, the torque output is assigned as the torque command obtained by multiplying the sum of the first product and the second product by the temperature coefficient corresponding to that motor, where the first product is the reference torque T of the dual-motor electric drive bridge. base1 The product of the motor's motor distribution coefficient and the second product is the single-motor electric drive axle reference torque T. base2 The product of the motor's normalized weighting coefficient.

8. A torque distribution system, characterized in that, include: The reference data acquisition module is used to acquire reference data based on the motor speed according to the motor parameter information and electric drive axle speed ratio information of the target assembly. The reference data includes the reference torque T of the dual-motor electric drive axle. base1 Single motor electric drive axle reference torque T base2 and the reference torque T corresponding to the first motor, the second motor, and the third motor respectively. base_MCM T base_MCMT T base_MCRT ; The control status identification module is used to identify the control status of the target assembly based on the priority operating sequence of the electric drive axle and the current gear information of the electric drive axle. The multi-parameter segmented torque distribution module is used to perform multi-parameter segmented torque distribution on the first motor, the second motor, and the third motor according to the target assembly's required torque, temperature information, and the reference data, matching the control conditions of the target assembly.

9. An electronic device, characterized in that, The apparatus includes: a memory, a processor, and a torque distribution program stored in the memory and executable on the processor, the torque distribution program being configured to implement the steps of the method as claimed in any one of claims 2 to 7.

10. A vehicle, characterized in that, It includes the same-bridge heterogeneous dual electric drive axle assembly as described in claim 1, and also includes the torque distribution system as described in claim 8 or the electronic device as described in claim 9.

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