Electric drive axle structure and driving method thereof

Abstract

The invention provides an electric drive axle structure and a driving method thereof. The electric drive axle structure comprises a rack; the adjustable-speed motor and the torque output motor are both arranged on the rack; a first gear ring of the first planet row is in transmission connection with an output shaft of the adjustable-speed motor, a first planet carrier of the first planet row is connected with the differential mechanism, and a first sun gear of the first planet row is in transmission connection with an output shaft of the torque output motor, so that the rotating speed and the torque of the adjustable-speed motor are adjusted through the first planet row; the torque is applied to the torque output motor; the problems that in the prior art, a heavy truck electric drive bridge system is large in size, heavy in weight and low in power density are solved.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to an electric drive bridge structure and a driving method thereof. Background Art

[0002] With the increasing global concern about environmental issues, especially the urgency of carbon emission control, the electrification process in the transportation industry is accelerating. Pure electric passenger vehicles have been widely used due to their lower carbon emissions and energy efficiency advantages. However, in the field of commercial vehicles, especially heavy trucks, electrification has progressed relatively slowly due to the demand for mileage and the limitation of battery energy density. To solve this problem, highly integrated electric drive axle systems, especially coaxial electric drive axles, have become a hot topic of current research because they can effectively save vehicle space, increase battery capacity, reduce system weight and increase mileage.

[0003] The current heavy-duty truck electric drive axle architecture mostly adopts a parallel axis layout, with each motor arranged on the front and rear sides of the electric drive axle. Although this layout can meet basic power requirements, the independent setting of the two motors and the use of cylindrical gears result in a large system volume, heavy weight, and low power density, which has an adverse effect on the space planning and weight control of the vehicle. These limiting factors are particularly prominent in heavy-duty truck applications that pursue high performance and long driving range.

[0004] On the other hand, although the electric drive axle with a coaxial design of dual motors has improved the integration, there are still some technical challenges. In order to achieve the continuity of power output during the gear shifting process, the two motors and their respective gearbox configurations must remain symmetrical, which leads to an increase in axial size and weight. In addition, the gearbox of each motor contains three planetary gears. Although the larger speed ratio can increase the torque and meet the performance requirements of heavy trucks, it also increases the complexity and cost of the system, affecting the overall efficiency and reliability of the system. Summary of the invention

[0005] The main purpose of the present invention is to provide an electric drive axle structure to solve the problems of large volume, heavy weight and low power density of heavy truck electric drive axle systems in the prior art.

[0006] In order to achieve the above object, according to one aspect of the present invention, an electric drive bridge structure and a driving method thereof are provided, comprising:

[0007] frame;

[0008] The speed regulating motor and the torque output motor are both arranged on the frame;

[0009] The first planetary row, the first ring gear of the first planetary row is drivingly connected to the output shaft of the speed regulating motor, the first planetary carrier of the first planetary row is connected to the differential, and the first sun gear of the first planetary row is drivingly connected to the output shaft of the torque output motor, so as to adjust the speed and torque of the speed regulating motor through the first planetary row to act on the torque output motor.

[0010] Furthermore, the electric drive bridge structure also includes:

[0011] The second planetary gear is arranged between the first planetary gear and the speed regulating motor, and the second planetary gear comprises:

[0012] A second gear ring, the second gear ring is arranged on the frame;

[0013] A second sun gear, the second sun gear is connected to the output shaft of the speed regulating motor;

[0014] The second planet carrier has an output end connected to the first ring gear of the first planetary row.

[0015] Furthermore, the electric drive axle structure further includes a third planetary gear disposed between the torque output motor and the first planetary gear, and the third planetary gear includes:

[0016] A third sun gear is connected to an output shaft of the torque output motor;

[0017] a third planet carrier, wherein an output end of the third planet carrier is connected to the first sun gear;

[0018] The third gear ring is arranged on the frame.

[0019] Furthermore, the electric drive axle structure also includes a first planetary gear train arranged between the speed regulating motor and the first planetary row, the sun gear in the first planetary gear train is connected to the output shaft of the speed regulating motor, and the planet carrier of the first planetary gear train is connected to the first ring gear.

[0020] Furthermore, the first planetary gear train comprises:

[0021] A fourth planetary gear, a fourth ring gear of the fourth planetary gear is arranged on the frame, and a fourth sun gear of the fourth planetary gear is connected to an output shaft of the speed regulating motor;

[0022] A fifth planetary gear, wherein the fifth sun gear of the fifth planetary gear is connected to the fourth planetary gear carrier of the fourth planetary gear, the fifth ring gear of the fifth planetary gear is arranged on the frame, and the fifth planetary gear carrier of the fifth planetary gear is connected to the first ring gear of the first planetary gear;

[0023] Among them, the planet carrier of the first planetary gear train is the fifth planet carrier, and the sun gear of the first planetary gear train is the fourth sun gear.

[0024] Furthermore, the electric drive axle structure further includes a sixth planetary gear set between the torque output motor and the first planetary gear, and the sixth planetary gear includes:

[0025] A sixth gear ring, the sixth gear ring is arranged on the frame;

[0026] A sixth planet carrier, wherein an output end of the sixth planet carrier is connected to the first sun gear of the first planet row;

[0027] The sixth sun gear is connected to the torque output motor.

[0028] Furthermore, the electric drive axle structure also includes a second planetary gear train arranged between the speed regulating motor and the first planetary gear train, the sun gear in the second planetary gear train is connected to the output shaft of the speed regulating motor, and the planet carrier of the second planetary gear train is connected to the first ring gear.

[0029] Further, the second planetary gear train comprises:

[0030] A seventh planetary gear, wherein a seventh ring gear of the seventh planetary gear is arranged on the frame, and a seventh sun gear of the seventh planetary gear is connected to an output shaft of the speed regulating motor;

[0031] an eighth planetary gear, wherein the eighth sun gear of the eighth planetary gear is connected to the seventh planetary gear carrier of the seventh planetary gear, the eighth ring gear of the eighth planetary gear is arranged on the frame, and the eighth planetary gear carrier of the eighth planetary gear is connected to the first ring gear of the first planetary gear;

[0032] Among them, the planet carrier of the second planetary gear train is the eighth planet carrier, and the sun gear of the second planetary gear train is the seventh sun gear.

[0033] Furthermore, a ninth planetary gear is provided between the first planetary gear and the differential, and the ninth planetary gear comprises:

[0034] A ninth gear ring, wherein the ninth gear ring is arranged on the frame;

[0035] A ninth planet carrier, an output shaft of the ninth planet carrier being connected to the differential;

[0036] The ninth sun gear is connected to the first planet carrier of the first planet row.

[0037] According to another embodiment of the present invention, a driving method is also provided. The driving method is applicable to the above-mentioned driving structure, and the driving method comprises: obtaining the accelerator pedal opening of the target vehicle within a predetermined travel;

[0038] Determine the target output torque corresponding to the torque output motor according to the accelerator pedal opening;

[0039] determining a first target rotational speed of the torque output motor according to the target output torque;

[0040] The second target speed of the speed-adjustable motor is determined according to the first target speed to control the speed-adjustable motor to run at the second target speed so that the torque output motor runs at the target output torque and the speed of the torque output motor runs at the first target speed.

[0041] Furthermore, the step of determining the target output torque corresponding to the torque output motor according to the accelerator pedal opening includes:

[0042] Traversing a preset accelerator pedal database, the preset accelerator pedal database includes a plurality of preset accelerator pedal openings and a preset output torque of the torque output motor corresponding to each accelerator pedal opening;

[0043] According to the accelerator pedal opening, a preset output torque corresponding to the accelerator pedal opening is determined in an accelerator pedal database, and the preset output torque is marked as the target output torque.

[0044] Further, the step of determining a first target rotational speed of the torque output motor according to the target output torque includes:

[0045] Traversing a preset torque output motor database, the preset torque output motor database including a plurality of preset output torques and a preset motor speed of the torque output motor corresponding to each preset output torque;

[0046] According to the target output torque, a preset motor speed corresponding to the target output torque is determined in a preset torque output motor database, and the preset motor speed is marked as a first target speed.

[0047] By applying the technical solution of the present invention, the speed and torque of the torque output motor can be steplessly adjusted through the cooperation of the speed regulating motor and the first planetary gear, so that the motor can always operate in the high-efficiency working range, thereby improving the energy conversion efficiency and reducing energy consumption.

[0048] This drive structure allows the torque output motor to continuously adjust its output torque according to driving conditions, avoiding power interruptions or shocks that may occur during traditional gear shifting and improving the power smoothness of the vehicle during driving.

[0049] Integrating the speed regulating motor, torque output motor and the first planetary gear on the frame greatly reduces the axial size of the system, improves the integration level and provides more space flexibility for vehicle design compared to the traditional parallel shaft layout.

[0050] By optimizing the structure, the number of planetary gear rows and unnecessary components are reduced, thereby reducing the weight of the entire electric drive axle system, which is beneficial to improving the vehicle's power and mileage.

[0051] The independent shift actuator is eliminated, which reduces complexity and the number of parts, simplifies the assembly process, and reduces production and maintenance costs.

[0052] The shift-free actuator reduces potential failure points and the number of parts is reduced, which improves the overall reliability of the system and reduces failure rates and maintenance requirements.

[0053] This drive structure can flexibly adapt to different driving conditions. Whether it is under low-speed and high-torque demand or high-speed and low-torque demand, it can achieve the optimal output of the torque output motor through the control of the speed regulating motor.

[0054] In summary, the coaxial electric drive axle drive structure provided by the present application has multiple advantages such as efficient energy conversion, smooth power output, improved integration, reduced system weight, reduced costs and enhanced reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0056] Figure 1 A schematic diagram showing the structure of the electric drive axle structure including the first planetary gear in an embodiment of the present application is shown;

[0057] Figure 2 The electric drive axle structure of the embodiment of the present application includes a second planetary gear and a third planetary gear.

[0058] Figure 3 A schematic diagram of the structure of the first planetary gear train in an embodiment of the present application is shown;

[0059] Figure 4 A schematic structural diagram of an embodiment of the present application with a second planetary gear train is shown.

[0060] The above drawings include the following reference numerals:

[0061] 1. Speed ​​regulating motor; 2. Torque output motor; 3. First planetary row; 301. First ring gear; 302. First planet carrier; 303. First sun gear; 4. Differential; 5. Second planetary row; 501. Second ring gear; 502. Second sun gear; 503. Second planet carrier; 6. Third planetary row; 601. Third sun gear; 602. Third planet carrier; 603. Third ring gear; 7. Fourth planetary row; 701. Fourth ring gear; 702. Fourth sun gear; 703. Fourth planet carrier; 8. Fifth planetary row; 801. Fifth sun gear Wheel; 802, fifth ring gear; 803, fifth planet carrier; 9, sixth planet row; 901, sixth ring gear; 902, sixth planet carrier; 903, sixth sun gear; 11, seventh planet row; 111, seventh ring gear; 112, seventh sun gear; 113, seventh planet carrier; 12, eighth planet row; 121, eighth sun gear; 122, eighth ring gear; 123, eighth planet carrier; 13, ninth planet row; 131, ninth ring gear; 132, ninth planet carrier; 133, ninth sun gear; C1, left wheel; C2, right wheel. DETAILED DESCRIPTION

[0062] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0063] With the increasing global concern about environmental issues, especially the urgency of carbon emission control, the electrification process in the transportation industry is accelerating. Pure electric passenger vehicles have been widely used due to their lower carbon emissions and energy efficiency advantages. However, in the field of commercial vehicles, especially heavy trucks, electrification has progressed relatively slowly due to the demand for mileage and the limitation of battery energy density. To solve this problem, highly integrated electric drive axle systems, especially coaxial electric drive axles, have become a hot topic of current research because they can effectively save vehicle space, increase battery capacity, reduce system weight and increase mileage.

[0064] The current heavy-duty truck electric drive axle architecture mostly adopts a parallel axis layout, with each motor arranged on the front and rear sides of the electric drive axle. Although this layout can meet basic power requirements, the independent setting of the two motors and the use of cylindrical gears result in a large system volume, heavy weight, and low power density, which has an adverse effect on the space planning and weight control of the vehicle. These limiting factors are particularly prominent in heavy-duty truck applications that pursue high performance and long driving range.

[0065] On the other hand, although the electric drive axle with a coaxial design of dual motors has improved the integration, there are still some technical challenges. In order to achieve the continuity of power output during the gear shifting process, the two motors and their respective gearbox configurations must remain symmetrical, which leads to an increase in axial size and weight. In addition, the gearbox of each motor contains three planetary gears. Although the larger speed ratio can increase the torque and meet the performance requirements of heavy trucks, it also increases the complexity and cost of the system, affecting the overall efficiency and reliability of the system.

[0066] The main purpose of the present invention is to provide an electric drive axle structure to solve the problems of large volume, heavy weight and low power density of heavy truck electric drive axle systems in the prior art.

[0067] First, the present application provides a driving structure, the driving structure comprising:

[0068] frame;

[0069] The speed regulating motor 1 and the torque output motor 2 are both arranged on the frame;

[0070] The first planetary row 3, the first ring gear 301 of the first planetary row 3 is drivingly connected to the output shaft of the speed regulating motor 1, the first planetary carrier 302 of the first planetary row 3 is connected to the differential 4, and the first sun gear 303 of the first planetary row 3 is drivingly connected to the output shaft of the torque output motor 2, so as to adjust the speed and torque of the speed regulating motor 1 through the first planetary row 3 to act on the torque output motor 2.

[0071] Specifically, Figures 1 to 4 As shown, the driving structure provided by the present application includes a frame, and a speed regulating motor 1 and a torque output motor 2 arranged on the frame, and the driving structure also includes a first planetary row 3, a first ring gear 301 of the first planetary row 3 is drivingly connected to the output shaft of the speed regulating motor 1, a first planetary carrier 302 of the first planetary row 3 is connected to the differential 4, and a first sun gear 303 of the first planetary row 3 is drivingly connected to the output shaft of the torque output motor 2, so as to adjust the speed and torque of the speed regulating motor 1 through the first planetary row 3 to act on the torque output motor 2.

[0072] Through the cooperation of the speed regulating motor 1 and the first planetary gear 3, the speed and torque of the torque output motor 2 are steplessly adjusted, so that the torque output motor 2 can always operate in the high-efficiency working range, thereby improving energy conversion efficiency and reducing energy consumption.

[0073] This drive structure allows the torque output motor 2 to continuously adjust its output torque according to driving conditions, avoiding power interruption or impact that may occur during traditional gear shifting, and improving the power smoothness of the vehicle during driving.

[0074] Integrating the speed regulating motor 1, the torque output motor 2 and the first planetary gear 3 on the frame greatly reduces the axial size of the system, improves the integration level and provides more space flexibility for vehicle design compared to the traditional parallel shaft layout.

[0075] By optimizing the structure, the number of planetary gear rows and unnecessary components are reduced, thereby reducing the weight of the entire electric drive axle system, which is beneficial to improving the vehicle's power and mileage.

[0076] The independent shift actuator is eliminated, which reduces complexity and the number of parts, simplifies the assembly process, and reduces production and maintenance costs.

[0077] The shift-free actuator reduces potential failure points and the number of parts is reduced, which improves the overall reliability of the system and reduces failure rates and maintenance requirements.

[0078] The drive structure can flexibly adapt to different driving conditions, and can achieve the optimal output of the torque output motor 2 by controlling the speed regulating motor 1, regardless of whether it is under low-speed and high-torque requirements or high-speed and low-torque requirements.

[0079] In summary, the coaxial electric drive axle drive structure provided by the present application has multiple advantages such as efficient energy conversion, smooth power output, improved integration, reduced system weight, reduced costs and enhanced reliability.

[0080] Furthermore, the electric drive axle structure further includes: a second planetary gear 5, which is arranged between the first planetary gear 3 and the speed regulating motor 1, and includes:

[0081] A second gear ring 501, the second gear ring 501 is arranged on the frame;

[0082] A second sun gear 502, the second sun gear 502 is connected to the output shaft of the speed regulating motor 1;

[0083] The second planet carrier 503 , the output end of the second planet carrier 503 is connected to the first ring gear 301 of the first planetary gear row 3 .

[0084] The second planetary gear 5 serves as a transmission element between the speed regulating motor 1 and the first planetary gear 3, and can perform additional torque amplification on the output of the speed regulating motor 1, thereby improving the torque output capacity of the entire electric drive axle and better meeting the high torque requirements of heavy trucks under complex working conditions.

[0085] The introduction of the second planetary gear 5 enables the speed of the speed regulating motor 1 to be further adjusted through the gear ratio of the second planetary gear 5, thereby increasing the speed regulating range and accuracy of the system and being able to achieve the optimal operating state of the torque output motor 2 within a wider range of operating conditions.

[0086] The compact integration of the second planetary gear 5 with the first planetary gear 3 and the speed regulating motor 1 further reduces the overall volume and weight of the system, improves the system integration, provides more space and flexibility for vehicle design, and is conducive to the optimization of vehicle performance.

[0087] By optimizing the gear ratio of the second planetary gear set 5, the energy loss in the transmission process can be reduced, thereby reducing the energy consumption of the entire electric drive axle system, improving the utilization efficiency of electric energy, and extending the vehicle's mileage.

[0088] The addition of the second planetary gear 5 provides a certain degree of redundancy for the electric drive axle system. Even in the event of failure of some components, the system can still maintain a certain degree of operation by adjusting the working status of other components, thereby improving the overall reliability and fault response capability of the system.

[0089] The combination of the second planetary gear 5, the speed regulating motor 1 and the first planetary gear 3 provides the control system with more abundant speed regulating and torque regulating means, which is conducive to realizing a more optimized control strategy and improving the driving experience and vehicle performance.

[0090] This drive structure can more flexibly adapt to different driving conditions, including but not limited to road slope, load changes, speed requirements, etc., ensuring stable and efficient power output under various conditions.

[0091] Furthermore, the electric drive axle structure further includes a third planetary gear 6 disposed between the torque output motor 2 and the first planetary gear 3, and the third planetary gear 6 includes:

[0092] The third sun gear 601 is connected to the output shaft of the torque output motor 2;

[0093] A third planet carrier 602, an output end of the third planet carrier 602 is connected to the first sun gear 303;

[0094] The third gear ring 603 is arranged on the frame.

[0095] The third planetary gear 6 can further amplify the output torque of the torque output motor 2 and provide additional speed regulation capability. This enables the system to more flexibly respond to torque and speed requirements under different driving conditions, improving driving experience and vehicle adaptability.

[0096] By optimizing the gear ratio of the third planetary gear 6, the energy loss in the power transmission process can be reduced, and the energy efficiency of the entire electric drive axle system can be improved, thereby reducing energy consumption and extending driving mileage. At the same time, the torque output motor 2 can maintain efficient operation in a wider speed range, further improving the overall efficiency of the system.

[0097] The integrated design of the third planetary gear 6 with the torque output motor 2 and the first planetary gear 3 not only reduces the axial dimension, but also simplifies the transmission path, improves the compactness and integration of the system, releases more space for vehicle design, and facilitates installation and maintenance.

[0098] The multi-stage planetary gear structure can effectively disperse the vibration and noise during the transmission process, improve driving comfort, and extend the service life of the system.

[0099] The third planetary gear 6 serves as an additional transmission component, providing additional redundancy for the system. Even if some components fail, the system can still maintain a certain degree of operation through other components, thereby improving the overall reliability and fault response capability of the system.

[0100] In summary, the introduction of the third planetary gear 6 not only enhances the torque amplification and speed regulation flexibility, but also significantly improves the overall performance and driving experience of the coaxial electric drive axle through technical effects such as improving system efficiency, optimizing power distribution, reducing vibration and noise, and enhancing system redundancy and reliability, making it more adaptable to the high performance requirements of heavy-duty trucks.

[0101] Furthermore, the electric drive axle structure also includes a first planetary gear train arranged between the speed regulating motor 1 and the first planetary row 3, the sun gear in the first planetary gear train is connected to the output shaft of the speed regulating motor 1, and the planet carrier of the first planetary gear train is connected to the first ring gear 301.

[0102] Furthermore, the first planetary gear train comprises:

[0103] A fourth planetary gear row 7, wherein a fourth ring gear 701 of the fourth planetary gear row 7 is arranged on the frame, and a fourth sun gear 702 of the fourth planetary gear row 7 is connected to the output shaft of the speed regulating motor 1;

[0104] The fifth planetary gear 8, the fifth sun gear 801 of the fifth planetary gear 8 is connected to the fourth planetary gear carrier 703 of the fourth planetary gear 7, the fifth ring gear 802 of the fifth planetary gear 8 is arranged on the frame, and the fifth planetary gear carrier 803 of the fifth planetary gear 8 is connected to the first ring gear 301 of the first planetary gear 3;

[0105] The planet carrier of the first planetary gear train is the fifth planet carrier 803 , and the sun gear of the first planetary gear train is the fourth sun gear 702 .

[0106] Specifically, the first planetary gear train is directly connected to the speed regulating motor 1 through the fourth sun gear 702, and the fifth planet carrier 803 is connected to the first gear ring 301 of the first planetary row 3, thus constructing a precise speed regulating and torque transmission path. This design allows the system to perform more precise control over the output of the speed regulating motor 1, achieving stepless speed regulation while effectively amplifying the torque, ensuring that the electric drive axle can provide stable and strong power output under various working conditions.

[0107] The cascaded use of the fourth planetary gear 7 and the fifth planetary gear 8 can optimize the power transmission path, reduce energy loss, and improve the efficiency of the overall electric drive axle system. Especially under high speed, high load or specific driving conditions, the reasonable design of the first planetary gear system can ensure that key components such as the speed regulating motor 1 and the torque output motor 2 operate in an efficient working range, thereby reducing energy consumption and extending the vehicle's mileage.

[0108] The planetary gear structure of the first planetary gear train can smoothly convert the output of the speed regulating motor 1, and can maintain the continuity and smoothness of power transmission even when the driving conditions change rapidly, avoiding power interruption or impact, and significantly improving the driving experience and vehicle handling performance.

[0109] The compact design of the first planetary gear train makes the transmission chain between the speed regulating motor 1 and the first planetary gear train 3 shorter and more streamlined, reduces the axial size of the system, and optimizes the spatial layout. This not only saves valuable vehicle interior space, but also helps reduce system weight and improve the power and economy of the vehicle.

[0110] The multi-level structure of the first planetary gear train provides additional redundancy for the system. Even if a component fails, the system can still maintain basic operation through other components, improving the overall reliability and fault response capabilities of the system and reducing potential maintenance costs and downtime.

[0111] The introduction of the first planetary gear train increases the parameters and levels of control system processing, laying the foundation for more complex and sophisticated control strategies. The control system can intelligently adjust the speed ratio of the planetary gear and the output of the motor according to the actual operating status and driving requirements of the vehicle to achieve the best power output and energy efficiency performance.

[0112] The multi-stage gear set design of the first planetary gear train can effectively disperse the vibration and noise during the transmission process, improve the acoustic environment in the cab, and enhance driving comfort. At the same time, this also extends the service life of each component of the system and reduces the maintenance cost of long-term operation.

[0113] Furthermore, the electric drive axle structure further includes a sixth planetary gear 9 disposed between the torque output motor 2 and the first planetary gear 3, and the sixth planetary gear 9 includes:

[0114] The sixth gear ring 901 is arranged on the frame;

[0115] A sixth planet carrier 902, where an output end of the sixth planet carrier 902 is connected to the first sun gear 303 of the first planet row 3;

[0116] The sixth sun gear 903 is connected to the torque output motor 2 .

[0117] The addition of the sixth planetary gear 9 can further amplify the output torque of the torque output motor 2, and an additional torque transmission and speed regulation link is formed through the direct connection between the sixth sun gear 903 and the torque output motor 2, and the connection between the sixth planetary carrier 902 and the first sun gear 303 of the first planetary gear 3. This design allows the system to optimize torque and speed output in a wider range of operating conditions to meet the power requirements of heavy trucks under different driving conditions.

[0118] Through the reasonable arrangement of the sixth planetary gear 9, the power transmission path between the torque output motor 2 and the first planetary gear 3 can be optimized, the loss in the energy conversion process can be reduced, and the efficiency of the overall electric drive axle system can be improved. Especially in low-speed conditions requiring high torque output, the sixth planetary gear 9 can ensure the maximum efficiency of the torque output motor 2, thereby reducing energy consumption and increasing the cruising range.

[0119] As an additional transmission link, the sixth planetary gear 9 can further smooth the speed change of the torque output motor 2. Even in the case of a sudden increase or decrease in load, it can maintain the continuity and smoothness of the power output and enhance the driving experience.

[0120] The compact design of the sixth planetary gear 9 makes the transmission chain between the torque output motor 2 and the first planetary gear 3 shorter and more streamlined, reduces the axial size of the system, optimizes the spatial layout, provides more possibilities for the integrated design of the electric drive axle, and is conducive to reducing the overall weight of the system and improving vehicle performance.

[0121] The addition of the sixth planetary gear 9 increases the transmission path redundancy of the electric drive axle. Even in the event of failure of certain components, the system can still rely on other components to maintain operation, thereby improving the overall reliability and fault tolerance and reducing maintenance costs.

[0122] Furthermore, the electric drive axle structure also includes a second planetary gear train arranged between the speed regulating motor 1 and the first planetary row 3, the sun gear in the second planetary gear train is connected to the output shaft of the speed regulating motor 1, and the planet carrier of the second planetary gear train is connected to the first ring gear 301.

[0123] Further, the second planetary gear train includes: a seventh planetary gear 11, a seventh ring gear 111 of the seventh planetary gear 11 is arranged on the frame, and a seventh sun gear 112 of the seventh planetary gear 11 is connected to the output shaft of the speed regulating motor 1;

[0124] The eighth planetary gear 12, the eighth sun gear 121 of the eighth planetary gear 12 is connected to the seventh planetary gear carrier 113 of the seventh planetary gear 11, the eighth ring gear 122 of the eighth planetary gear 12 is arranged on the frame, and the eighth planetary gear carrier 123 of the eighth planetary gear 12 is connected to the first ring gear 301 of the first planetary gear 3;

[0125] The planet carrier of the second planetary gear train is the eighth planet carrier 123 , and the sun gear of the second planetary gear train is the seventh sun gear 112 .

[0126] The seventh sun gear 112 of the second planetary gear system is directly connected to the output shaft of the speed regulating motor 1. Through the cascade effect of the seventh planetary gear 11 and the eighth planetary gear 12, a wider speed regulating range and more efficient torque amplification can be achieved, ensuring that the output torque and speed of the speed regulating motor 1 can accurately match the requirements of heavy trucks under complex working conditions, thereby improving driving experience and driving efficiency.

[0127] The cascade design of the seventh planetary gear 11 and the eighth planetary gear 12 allows the system to reduce energy loss during power transmission by optimizing the gear ratio and speed regulation strategy. In particular, under the condition that the speed regulating motor 1 needs to operate efficiently, the reasonable configuration of the second planetary gear train can ensure that the motor operates at the optimal efficiency point, thereby reducing overall energy consumption and extending the vehicle's cruising range.

[0128] The second planetary gear train can further smooth the output of the speed regulating motor 1, reduce the discontinuity in the power output process, improve the smoothness and response speed of power transmission, and maintain the continuity of the power output of the electric drive axle even when the load or speed changes rapidly, thereby enhancing driving comfort and vehicle controllability.

[0129] The compact design of the second planetary gear system, especially the connection between the eighth planet carrier 123 and the first ring gear 301 of the first planetary row 3, reduces the axial dimension, optimizes the spatial layout of the transmission system, improves the integration and design flexibility of the electric drive axle, is beneficial to the optimization of vehicle space and the reduction of system weight, and improves the overall performance of the vehicle.

[0130] The addition of the seventh planetary gear 11 and the eighth planetary gear 12 provides additional transmission path redundancy for the electric drive axle system. Even if some components fail, the system can still maintain operation through other components, thereby enhancing the reliability and fault tolerance of the system and reducing potential maintenance costs and downtime.

[0131] The introduction of the second planetary gear train increases the parameters and levels of control system processing, making the control strategy more flexible and intelligent in dealing with complex working conditions. The control system can accurately adjust the speed ratio of the planetary gear train and the output of the motor according to the actual operating status of the vehicle, optimize the power output, and improve energy efficiency and driving experience.

[0132] Furthermore, a ninth planetary gear 13 is provided between the first planetary gear 3 and the differential 4. The ninth planetary gear 13 includes:

[0133] A ninth gear ring 131, wherein the ninth gear ring 131 is disposed on the frame;

[0134] A ninth planet carrier 132, the output shaft of which is connected to the differential 4;

[0135] The ninth sun gear 133 is connected to the first planet carrier 302 of the first planet row 3 .

[0136] Specifically, the introduction of the ninth planetary gear 13, especially the connection between the ninth sun gear 133 and the first planetary carrier 302 of the first planetary gear 3, and the direct connection of the output shaft of the ninth planetary carrier 132 with the differential 4, can further optimize the distribution of torque between the left wheel C1 and the right wheel C2. This not only enhances the adaptability of the electric drive axle to complex road conditions, such as turning, slippery or uneven roads, but also enables more precise adjustment of the differential ratio of the differential, thereby improving the vehicle's handling stability and driving safety.

[0137] The ninth planetary gear 13 can reduce the energy loss between the first planetary gear 3 and the differential 4 through its gear ratio design. Especially under high-speed driving or stable output conditions, the efficient transmission characteristics of the ninth planetary gear 13 can significantly improve the energy efficiency of the entire electric drive axle system, reduce energy consumption, and extend the vehicle's mileage.

[0138] As an additional transmission link, the ninth planetary gear 13 can help smooth the power transmission between the first planetary gear 3 and the differential 4, and can maintain the continuity and stability of power output even when the vehicle speed or load changes, thereby improving the driving experience.

[0139] The compact design of the ninth planetary gear 13 reduces the axial dimension between the first planetary gear 3 and the differential 4, optimizes the spatial layout of the transmission system, and improves the integration of the electric drive axle, which is conducive to saving vehicle internal space, reducing system weight, and thus improving the overall performance of the vehicle.

[0140] The ninth planetary gear 13 increases the redundancy of the transmission path and improves the fault tolerance of the electric drive axle system. Even if some components of the first planetary gear 3 or the differential 4 fail, the ninth planetary gear 13 can be used as a backup transmission path to maintain some functions of the system, reduce the risk of vehicle downtime, and improve reliability.

[0141] The addition of the ninth planetary gear 13 provides more parameters and control points for the control system, making the control strategy more flexible and complex. It can intelligently adjust the speed ratio and torque distribution of the planetary gear according to the actual driving state and road conditions of the vehicle to achieve optimal power performance and energy efficiency.

[0142] The present application also provides a driving method, which is applicable to the above-mentioned driving structure, and comprises: obtaining the accelerator pedal opening of the target vehicle within a predetermined travel;

[0143] Determine the target output torque corresponding to the torque output motor according to the accelerator pedal opening;

[0144] Specifically:

[0145] The step of determining the target output torque corresponding to the torque output motor according to the accelerator pedal opening comprises:

[0146] Traversing a preset accelerator pedal database, the preset accelerator pedal database includes a plurality of preset accelerator pedal openings and a preset output torque of the torque output motor corresponding to each accelerator pedal opening;

[0147] According to the accelerator pedal opening, a preset output torque corresponding to the accelerator pedal opening is determined in an accelerator pedal database, and the preset output torque is marked as the target output torque.

[0148] By traversing the preset accelerator pedal database, the accelerator pedal opening of the target vehicle within the predetermined range is accurately matched with the preset output torque of the torque output motor. This method can ensure that the output torque of the motor is closely linked to the driver's intention, provide more accurate power response, and enhance the driving experience. Among them, the preset accelerator pedal database includes multiple preset accelerator pedal openings, and each preset accelerator pedal opening corresponds to a torque output torque of the torque output motor.

[0149] The data in the preset accelerator pedal database has been carefully calibrated and can find the most suitable output torque of the torque output motor according to different accelerator pedal openings, ensuring that the torque output motor can operate in its efficient working range under various working conditions, thereby reducing energy consumption and improving the overall energy efficiency of the electric drive axle system.

[0150] Since the target output torque of the torque output motor can be smoothly adjusted according to the accelerator pedal opening, this method helps to reduce sudden changes in power output, improve the vehicle's power smoothness under different driving conditions, reduce the impact during driving, and enhance comfort.

[0151] The use of the preset database enables the control system to quickly determine the target output torque, reduce calculation delays, and improve the system's response speed to the driver's operations. Especially in emergency acceleration or deceleration situations, it can quickly adjust the torque output of the motor to ensure the safety and stability of vehicle driving.

[0152] The database contains a variety of correspondences between preset accelerator pedal openings and preset output torques, which provides a rich data resource for the control system, making the control strategy more flexible and diverse, and able to be dynamically adjusted according to road conditions, vehicle status and driving mode to achieve the best driving effect.

[0153] By precisely matching the accelerator pedal opening with the motor output torque, the entire power system can be optimized and regulated, including components such as the speed control motor, planetary gearbox, and differential, to ensure the efficiency of the power transmission path, while reducing mechanical losses within the system and extending its service life.

[0154] The intelligent application of the preset accelerator pedal database can help the electric drive axle system allocate and use energy more reasonably and reduce unnecessary energy consumption, which plays an important role in reducing vehicle operating costs, reducing carbon emissions and improving the vehicle's environmental performance.

[0155] To sum up, the driving method of the present application can not only provide precise power output, optimize energy efficiency performance, improve power smoothness and response speed through intelligent torque control strategy, but also enhance the flexibility of control strategy, realize the overall optimization of the power system, and ultimately achieve energy-saving and environmentally friendly driving goals, meeting the more stringent requirements of modern commercial vehicles, especially heavy trucks, in terms of power, economy and environmental protection.

[0156] determining a first target rotational speed of the torque output motor according to the target output torque;

[0157] Specifically:

[0158] The step of determining a first target speed of the torque output motor according to the target output torque comprises:

[0159] Traversing a preset torque output motor database, the preset torque output motor database including a plurality of preset output torques and a preset motor speed of the torque output motor corresponding to each preset output torque;

[0160] According to the target output torque, a preset motor speed corresponding to the target output torque is determined in a preset torque output motor database, and the preset motor speed is marked as a first target speed.

[0161] By traversing the preset torque output motor database, the target output torque is accurately matched to the most matching motor speed. This method ensures that the motor operates at the optimal efficiency point when outputting a specific torque, thereby reducing losses during energy conversion, improving the energy efficiency of the entire electric drive axle system, and extending the vehicle's mileage.

[0162] The information in the preset database can help the control system accurately adjust the motor speed to the state that best matches the target output torque, reducing power waste or insufficient output due to mismatch between torque and speed, improving vehicle power performance, and ensuring that the driver can obtain stable and efficient power response.

[0163] The process of determining the first target speed is smooth and rapid, avoiding power output fluctuations caused by sudden changes in speed, thereby improving driving smoothness and comfort, especially under conditions of frequent starting and stopping on urban roads, and can significantly reduce the sense of frustration during acceleration and deceleration.

[0164] The use of the database enables the control system to intelligently adjust the motor speed and quickly retrieve and match the most suitable motor speed according to the vehicle's real-time operating requirements, reducing control complexity and improving the system's response speed and intelligence level.

[0165] The motor operates at the optimal efficiency point, reducing internal losses and wear caused by overload or inefficient operation, extending the service life of the motor and its transmission components, thereby reducing long-term maintenance costs and downtime, and improving vehicle availability and economic benefits.

[0166] Intelligently matching motor speed and torque output reduces unnecessary energy consumption and lowers carbon emissions, which is of great significance for achieving the goals of green transportation, energy conservation and carbon reduction.

[0167] The diversity of the preset torque output motor database enables the system to adapt to the torque requirements under different driving modes and road conditions, improving the vehicle's adaptability and control flexibility in complex environments.

[0168] To sum up, this application not only improves the energy efficiency, power matching accuracy and smoothness of the electric drive axle system by determining the first target speed of the torque output motor, but also enhances the intelligent control level of the system, reduces maintenance costs, achieves energy-saving and environmentally friendly driving goals, and meets the needs of modern commercial vehicles in terms of power performance, economy and environmental protection.

[0169] The second target speed of the speed-adjustable motor is determined according to the first target speed to control the speed-adjustable motor to run at the second target speed so that the torque output motor runs at the target output torque and the speed of the torque output motor runs at the first target speed.

[0170] This method ensures the coordinated work between the torque output motor and the speed regulating motor. Through the precise control of the second target speed, the torque output motor can stably operate at the first target speed and output the target torque, thus achieving efficient coordination between the various components of the power system and improving the overall performance.

[0171] The matching between the second target speed of the speed regulating motor and the first target speed of the torque output motor can reduce the waste of energy in the conversion process and ensure that the motor system operates in the most efficient manner under various driving conditions, thereby reducing energy consumption and extending the vehicle's cruising range. This is especially important for commercial heavy trucks and other vehicles that need to travel long distances.

[0172] The determination of the second target speed further refines the control of the motor system, which can effectively reduce the fluctuation of the torque output motor speed, making the vehicle more stable when accelerating, decelerating or maintaining a constant speed, and enhancing driving stability and safety performance.

[0173] The speed regulating motor runs precisely at the second target speed, reducing unnecessary speed changes and mechanical shocks, and reducing the wear rate of transmission components such as gears and planetary gears, thereby extending the service life of the entire electric drive axle system and reducing long-term maintenance costs and downtime.

[0174] Through intelligent matching of the database and dynamic speed control of the speed regulating motor, the system can automatically adjust the operating status of the motor according to real-time driving needs and road conditions, reducing dependence on human intervention and improving the intelligence and automation level of the electric drive axle control system.

[0175] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0176] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0177] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0178] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0179] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0180] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric drive bridge structure, characterized in that: include: frame; The speed regulating motor (1) and the torque output motor (2) are both arranged on the frame; A first planetary row (3), wherein a first ring gear (301) of the first planetary row (3) is drivingly connected to an output shaft of the speed regulating motor (1), a first planet carrier (302) of the first planetary row (3) is connected to a differential (4), and a first sun gear (303) of the first planetary row (3) is drivingly connected to an output shaft of the torque output motor (2), so as to adjust the speed and torque of the speed regulating motor (1) through the first planetary row (3) so as to act on the torque output motor (2).

2. The electric drive bridge structure according to claim 1, characterized in that: The electric drive bridge structure also includes: A second planetary gear (5), the second planetary gear (5) being arranged between the first planetary gear (3) and the speed regulating motor (1), the second planetary gear (5) comprising: A second gear ring (501), wherein the second gear ring (501) is arranged on the frame; A second sun gear (502), the second sun gear (502) being connected to an output shaft of the speed regulating motor (1); A second planet carrier (503), wherein an output end of the second planet carrier (503) is connected to the first ring gear (301) of the first planetary gear (3).

3. The electric drive bridge structure according to claim 2, characterized in that: The electric drive axle structure further comprises a third planetary gear (6) arranged between the torque output motor (2) and the first planetary gear (3), wherein the third planetary gear (6) comprises: A third sun gear (601) connected to an output shaft of the torque output motor (2); A third planet carrier (602), wherein an output end of the third planet carrier (602) is connected to the first sun gear (303); A third gear ring (603), wherein the third gear ring (603) is arranged on the frame.

4. The electric drive bridge structure according to claim 1, characterized in that: The electric drive axle structure also includes a first planetary gear train arranged between the speed regulating motor (1) and the first planetary gear (3), the sun gear in the first planetary gear train is connected to the output shaft of the speed regulating motor (1), and the planet carrier of the first planetary gear train is connected to the first ring gear (301).

5. The electric drive bridge structure according to claim 4, characterized in that: The first planetary gear train comprises: A fourth planetary gear (7), wherein a fourth ring gear (701) of the fourth planetary gear (7) is arranged on the frame, and a fourth sun gear (702) of the fourth planetary gear (7) is connected to an output shaft of the speed regulating motor (1); a fifth planetary gear (8), wherein the fifth sun gear (801) of the fifth planetary gear (8) is connected to the fourth planetary gear carrier (703) of the fourth planetary gear (7), the fifth ring gear (802) of the fifth planetary gear (8) is arranged on the frame, and the fifth planetary gear carrier (803) of the fifth planetary gear (8) is connected to the first ring gear (301) of the first planetary gear (3); Among them, the planet carrier of the first planetary gear train is the fifth planet carrier (803), and the sun gear of the first planetary gear train is the fourth sun gear (702).

6. The electric drive bridge structure according to claim 1, characterized in that: The electric drive axle structure further comprises a sixth planetary gear (9) arranged between the torque output motor (2) and the first planetary gear (3), wherein the sixth planetary gear (9) comprises: a sixth gear ring (901), the sixth gear ring (901) being arranged on the frame; A sixth planet carrier (902), wherein an output end of the sixth planet carrier (902) is connected to a first sun gear (303) of the first planet row (3); A sixth sun gear (903), the sixth sun gear (903) is connected to the torque output motor (2).

7. The electric drive bridge structure according to claim 1, characterized in that: The electric drive axle structure further comprises a second planetary gear train arranged between the speed regulating motor (1) and the first planetary gear (3), the sun gear in the second planetary gear train being connected to the output shaft of the speed regulating motor (1), and the planet carrier of the second planetary gear train being connected to the first ring gear (301).

8. The electric drive bridge structure according to claim 7, characterized in that: The second planetary gear train comprises: A seventh planetary gear (11), wherein a seventh ring gear (111) of the seventh planetary gear (11) is arranged on the frame, and a seventh sun gear (112) of the seventh planetary gear (11) is connected to an output shaft of the speed regulating motor (1); an eighth planetary gear (12), wherein the eighth sun gear (121) of the eighth planetary gear (12) is connected to the seventh planetary gear carrier (113) of the seventh planetary gear (11), the eighth ring gear (122) of the eighth planetary gear (12) is arranged on the frame, and the eighth planetary gear carrier (123) of the eighth planetary gear (12) is connected to the first ring gear (301) of the first planetary gear (3); The planet carrier of the second planetary gear train is the eighth planet carrier (123), and the sun gear of the second planetary gear train is the seventh sun gear (112).

9. The electric drive bridge structure according to claim 1, characterized in that: A ninth planetary gear (13) is further provided between the first planetary gear (3) and the differential (4), and the ninth planetary gear (13) comprises: a ninth gear ring (131), the ninth gear ring (131) being arranged on the frame; A ninth planet carrier (132), an output shaft of the ninth planet carrier (132) being connected to the differential (4); A ninth sun gear (133), the ninth sun gear (133) is connected to the first planet carrier (302) of the first planetary gear (3).

10. A driving method, characterized in that: The driving method is applicable to the electric drive bridge structure according to any one of claims 1 to 9, and the driving method comprises: Obtaining the accelerator pedal opening of the target vehicle within a predetermined range; Determining a target output torque corresponding to the torque output motor according to the accelerator pedal opening; determining a first target rotation speed of the torque output motor according to the target output torque; A second target speed of the speed regulating motor is determined according to the first target speed to control the speed regulating motor to operate at the second target speed, so that the torque output motor operates at the target output torque and the speed of the torque output motor operates at the first target speed.

11. The driving method according to claim 10, characterized in that: The step of determining the target output torque corresponding to the torque output motor according to the accelerator pedal opening comprises: Traversing a preset accelerator pedal database, the preset accelerator pedal database including a plurality of preset accelerator pedal openings and a preset output torque of the torque output motor corresponding to each of the accelerator pedal openings; According to the accelerator pedal opening, a preset output torque corresponding to the accelerator pedal opening is determined in the accelerator pedal database, and the preset output torque is marked as the target output torque.

12. The driving method according to claim 10, characterized in that: The step of determining the first target speed of the torque output motor according to the target output torque comprises: Traversing a preset torque output motor database, wherein the preset torque output motor database includes a plurality of preset output torques and a preset motor speed of a torque output motor corresponding to each of the preset output torques; According to the target output torque, a preset motor speed corresponding to the target output torque is determined in the preset torque output motor database, and the preset motor speed is marked as the first target speed.

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