Multi-gear electric drive axle with double motors arranged on two sides, control method and electric automobile

Abstract

The invention discloses a double-motor double-side-arranged multi-gear electric drive axle in the technical field of automobiles. The double-motor double-side-arranged multi-gear electric drive axle comprises a first motor MG1, a multi-gear transmission, a differential mechanism, a second motor MG2, a speed reducer and an output shaft. The first motor MG1 and the second motor MG2 are arranged on the two sides of the output shaft. The output shaft comprises a first output shaft and a second output shaft; the first motor MG1 is in transmission connection with the differential mechanism through the multi-gear transmission; the second motor MG2 is in transmission connection with a differential through a speed reducer; the differential mechanism is in transmission connection with the first output shaft and the second output shaft, the first output shaft is used for driving wheels on one side to rotate, and the second output shaft is used for driving wheels on the other side to rotate. According to the invention, the offset torque can be effectively reduced, and when one motor is interrupted due to gear shifting power, the other motor can still output power, so that the driving experience is improved; according to the invention, the manufacturing cost can be reduced, the maintenance is more convenient, heat generation and noise can be reduced, and the transmission efficiency is high.

Description

Technical Field

[0001] The present invention relates to a multi-speed electric drive axle with double motors arranged on both sides, a control method and an electric vehicle, belonging to the technical field of automobiles. Background Art

[0002] In the prior art, a multi-speed electric drive axle with a single-side arrangement usually uses only one motor, resulting in power interruption during gear shifting of the gearbox, which affects the vehicle's power performance and driving experience.

[0003] A multi-speed electric drive axle with a single-side arrangement usually uses only one motor. To meet the requirements of the overall bridge output torque, the motor has a large size, many transmission stages, low transmission efficiency, and a large spatial size, which is not conducive to the installation and layout of the whole vehicle; due to the motor and the gearbox being arranged on the same side of the output shaft in a multi-speed electric drive axle with a single-side arrangement, there is a large offset torque in the electric drive axle.

[0004] In the prior art, an electric drive axle generally has 1 - 2 gears. For commercial vehicles with a large load capacity, it is difficult to balance the power performance and economic requirements under multiple working conditions of the vehicle.

[0005] In the prior art, for a multi-speed electric drive axle with a double-motor arrangement, a planetary gear mechanism is usually used to realize the power coupling of the two motors. The planetary gear mechanism requires high-precision machining to ensure uniform load on the planetary gears, with strict tolerance control, high machining difficulty, and high manufacturing cost; compared with a parallel-axis gear mechanism, the planetary gear mechanism requires strict alignment during assembly and requires disassembling the entire gear train for maintenance; the closed structure of the planetary gear mechanism causes obvious heat generation due to friction of the internal gear, which is likely to lead to rapid wear or gluing; the periodic excitation introduced by the revolution of the planetary gears in the planetary gear mechanism may excite system resonance and generate noise. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a multi-speed electric drive axle with double motors arranged on both sides, a control method and an electric vehicle.

[0007] To solve the above technical problem, the present invention is implemented by adopting the following technical solutions.

[0008] In a first aspect, the present invention discloses a multi-speed electric drive axle with double motors arranged on both sides, including: a first motor MG1, a multi-speed transmission, a differential, a second motor MG2, a reducer, and an output shaft; The first motor MG1 and the second motor MG2 are arranged on both sides of the output shaft; The output shaft includes: a first output shaft and a second output shaft; The first motor MG1 is drivingly connected to the differential through the multi-speed transmission; The second motor MG2 is drivingly connected to the differential through the reducer; The differential is respectively drivingly connected to the first output shaft and the second output shaft. The first output shaft is used to drive one side wheel to rotate, and the second output shaft is used to drive the other side wheel to rotate.

[0009] Further, the multi-speed transmission includes: A first motor output shaft, which is drivingly connected to the first motor MG1, and a first gear is provided on the first motor output shaft; A first intermediate shaft, on which a second gear, a third gear and a fourth gear are provided, and the third gear meshes with the first gear; A sleeve shaft, on which a fifth gear, a sixth gear and a seventh gear are provided, and the sixth gear meshes with the second gear; the seventh gear meshes with the fourth gear; A first sliding sleeve shifting mechanism, which is connected to the sleeve shaft, and the first sliding sleeve shifting mechanism is controlled to be connected to or disconnected from the sixth gear and the seventh gear; A second sliding sleeve shifting mechanism, which is connected to the sleeve shaft, and the second sliding sleeve shifting mechanism is controlled to be connected to or disconnected from the fifth gear; A second intermediate shaft, on which an eighth gear and a ninth gear are provided, and the ninth gear meshes with the fifth gear; A third intermediate shaft, on which a tenth gear and an eleventh gear are provided, and the eleventh gear meshes with the fifth gear.

[0010] Further, the reducer includes: A second motor output shaft, which is drivingly connected to the second motor MG2, and a twelfth gear is provided on the second motor output shaft; A fourth intermediate shaft, on which a thirteenth gear and a fourteenth gear are provided, and the fourteenth gear meshes with the twelfth gear.

[0011] Further, a sixteenth gear is provided on the differential, the sixteenth gear meshes with the eighth gear, the sixteenth gear meshes with the tenth gear, and the second sliding sleeve shifting mechanism is controlled to be connected to or disconnected from the sixteenth gear.

[0012] Further, a fifteenth gear is provided on the differential, and the fifteenth gear meshes with the thirteenth gear.

[0013] Further, the first output shaft and the second output shaft are on the same straight line, and the first motor MG1 and the multi-speed transmission and the second motor MG2 and the reducer are evenly arranged on both sides of the straight line.

[0014] Further, it further includes a shift control unit electrically connected to the first sliding sleeve shift mechanism and the second sliding sleeve shift mechanism. The shift control unit is used to respectively control the connection or disconnection of the sixth gear and the seventh gear with the first sliding sleeve shift mechanism; the shift control unit is further used to control the connection or disconnection of the fifth gear and the sixteenth gear with the second sliding sleeve shift mechanism.

[0015] Further, the differential uses a differential with a differential lock function.

[0016] In a second aspect, the present invention also discloses a control method for a multi-speed electric drive axle with dual motors arranged on both sides, including: Obtain a gear control command; Control the first sliding sleeve shift mechanism and the second sliding sleeve shift mechanism according to the gear control command, including: In response to a gear control command when the electric drive axle is in the neutral mode, the first sliding sleeve shift mechanism is disconnected from both the sixth gear and the seventh gear; the second sliding sleeve shift mechanism is disconnected from both the fifth gear and the sixteenth gear; In response to a gear control command when the electric drive axle is in the first gear mode, the first sliding sleeve shift mechanism is connected to the seventh gear and disconnected from the sixth gear; the second sliding sleeve shift mechanism is connected to the fifth gear and disconnected from the sixteenth gear; In response to a gear control command when the electric drive axle is in the second gear mode, the first sliding sleeve shift mechanism is connected to the sixth gear and disconnected from the seventh gear; the second sliding sleeve shift mechanism is connected to the fifth gear and disconnected from the sixteenth gear; In response to a gear control command when the electric drive axle is in the third gear mode, the first sliding sleeve shift mechanism is connected to the sixth gear and disconnected from the seventh gear; the second sliding sleeve shift mechanism is connected to the sixteenth gear and disconnected from the fifth gear; In response to a gear control command when the electric drive axle is in the fourth gear mode, the first sliding sleeve shift mechanism is connected to the seventh gear and disconnected from the sixth gear; the second sliding sleeve shift mechanism is connected to the sixteenth gear and disconnected from the fifth gear.

[0017] In a third aspect, the present invention also discloses an electric vehicle, characterized by including the multi-speed electric drive axle with dual motors arranged on both sides in the first aspect.

[0018] The beneficial effects achieved by the present invention: In the first aspect, the present invention uses dual motors and arranges them on both sides close to the output shaft, effectively reducing the offset torque; the transmission system layout of the dual motors ensures that when the power of one motor is interrupted due to shifting, the other motor can still output power, improving the driving experience; The multi-speed electric drive axle with double motors arranged on both sides of the present invention does not require a planetary gear mechanism to achieve the power coupling of the two motors. The power transmission routes of the two motors use a parallel-axis gear mechanism, and the power coupling is achieved through a differential; it can reduce the manufacturing cost, is more convenient for maintenance, and can reduce heat generation and noise.

[0019] Second, the present invention has four speed change gears, which can better balance the power and economic requirements of the whole vehicle, broaden the application range of the motor speed and torque, the power transmission route in the high-speed gear is short, and the transmission efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a power transmission route diagram of the neutral gear of the present invention; Figure 3 is a power transmission route diagram of the first gear of the present invention; Figure 4 is a power transmission route diagram of the second gear of the present invention; Figure 5 is a power transmission route diagram of the third gear of the present invention; Figure 6 is a power transmission route diagram of the fourth gear of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0023] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0024] Embodiment 1. This embodiment introduces a multi-speed electric drive axle with dual motors arranged on both sides. As Figure 1 shown, it includes: a first motor MG130, a multi-speed transmission, a differential 21, a second motor MG216, a reducer, and an output shaft; The first motor MG130 and the second motor MG216 are arranged on both sides of the output shaft; The output shaft includes: a first output shaft 22 and a second output shaft 9; The first motor MG130 is drivingly connected to the differential 21 through the multi-speed transmission; The second motor MG216 is drivingly connected to the differential 21 through the reducer; The differential 21 is respectively drivingly connected to the first output shaft 22 and the second output shaft 9. The first output shaft 22 is used to drive one side wheel to rotate, and the second output shaft 9 is used to drive the other side wheel to rotate.

[0025] The multi-speed transmission includes: A first motor output shaft 2, on which a first gear 1 is provided; A first intermediate shaft 5, on which a second gear 29, a third gear 3, and a fourth gear 4 are provided. The third gear 3 meshes with the first gear 1; A sleeve shaft 8, on which a second sliding sleeve shifting mechanism 24, a fifth gear 10, a sixth gear 28, a first sliding sleeve shifting mechanism 6, and a seventh gear 7 are provided. The second sliding sleeve shifting mechanism 24 is associated with the fifth gear 10, the first sliding sleeve shifting mechanism 6 is associated with the sixth gear 28, the first sliding sleeve shifting mechanism 6 is associated with the seventh gear 7, the sixth gear 28 meshes with the second gear 29, and the seventh gear 7 meshes with the fourth gear 4; A second intermediate shaft 26, on which an eighth gear 25 and a ninth gear 27 are provided. The ninth gear 27 meshes with the fifth gear 10; A third intermediate shaft 15, on which a tenth gear 17 and an eleventh gear 14 are provided. The eleventh gear 14 meshes with the fifth gear 10.

[0026] The reducer includes: The output shaft 13 of the second motor, and a twelfth gear 12 is provided on the output shaft 13 of the second motor; The fourth intermediate shaft 19, and a thirteenth gear 18 and a fourteenth gear 11 are provided on the fourth intermediate shaft 19, and the fourteenth gear 11 meshes with the twelfth gear 12.

[0027] A fifteenth gear 20 and a sixteenth gear 23 are provided on the differential 21, the fifteenth gear 20 meshes with the thirteenth gear 18, the sixteenth gear 23 meshes with the eighth gear 25, and the sixteenth gear 23 meshes with the tenth gear 17.

[0028] The first output shaft 22 is in transmission connection with the differential 21, and the second output shaft 9 is in transmission connection with the differential 21.

[0029] The first motor MG130 is in transmission connection with the output shaft 2 of the first motor, and the second motor MG216 is in transmission connection with the output shaft 13 of the second motor.

[0030] It further includes a shift control unit electrically connected to the first sliding sleeve shift mechanism 6 and the second sliding sleeve shift mechanism 24. The shift control unit is used to respectively control the connection or disconnection of the sixth gear 28, the seventh gear 7 and the first sliding sleeve shift mechanism 6; the shift control unit is further used to control the connection or disconnection of the fifth gear 10, the sixteenth gear 23 and the second sliding sleeve shift mechanism 24.

[0031] The first output shaft 22 and the second output shaft 9 are on the same straight line, and the first motor MG130 and the multi-gear transmission and the second motor MG216 and the reducer are evenly arranged on both sides of the straight line, and the overall center of the first motor MG130 and the multi-gear transmission and the second motor MG216 and the reducer is close to the straight line; the transmission components of the multi-gear transmission and the reducer, the first motor MG130 and the second motor MG216 are respectively arranged on the opposite sides of the sleeve shaft 8, forming a relatively balanced arrangement; with an innovative structural design layout, the motors and the transmission system components are evenly arranged on both sides of the output shaft, effectively reducing the offset torque.

[0032] The differential uses a differential with a differential lock function; the differential has a differential lock function, meeting the usage requirements of various scenarios of commercial vehicles.

[0033] The multi-speed electric drive axle with dual motors arranged on both sides of the present invention does not use a planetary gear mechanism to achieve the power coupling of the first motor MG130 and the second motor MG216. The power transmission routes of the first motor MG130 and the second motor MG216 use a parallel-axis gear mechanism, and power coupling is achieved by arranging a fifteenth gear 20 and a sixteenth gear 23 on the differential 21. The fifteenth gear 20 receives the power transmitted by the first motor MG130, the sixteenth gear 23 receives the power transmitted by the second motor MG216, and then the power is transmitted to the first output shaft 22 and the second output shaft 9 through the differential 21.

[0034] Embodiment 2, based on the same inventive concept as Embodiment 1, this embodiment introduces a control method for a multi-speed electric drive axle with dual motors arranged on both sides, including: Obtain a gear control command; Control the first sliding sleeve shifting mechanism 6 and the second sliding sleeve shifting mechanism 24 according to the gear control command, including: In response to a gear control command when the electric drive axle is in the neutral mode, the first sliding sleeve shifting mechanism 6 is disconnected from both the sixth gear 28 and the seventh gear 7; the second sliding sleeve shifting mechanism 24 is disconnected from both the fifth gear 10 and the sixteenth gear 23; In response to a gear control command when the electric drive axle is in the first gear mode, the first sliding sleeve shifting mechanism 6 is connected to the seventh gear 7 and disconnected from the sixth gear 28; the second sliding sleeve shifting mechanism 24 is connected to the fifth gear 10 and disconnected from the sixteenth gear 23; In response to a gear control command when the electric drive axle is in the second gear mode, the first sliding sleeve shifting mechanism 6 is connected to the sixth gear 28 and disconnected from the seventh gear 7; the second sliding sleeve shifting mechanism 24 is connected to the fifth gear 10 and disconnected from the sixteenth gear 23; In response to a gear control command when the electric drive axle is in the third gear mode, the first sliding sleeve shifting mechanism 6 is connected to the sixth gear 28 and disconnected from the seventh gear 7; the second sliding sleeve shifting mechanism 24 is connected to the sixteenth gear 23 and disconnected from the fifth gear 10; In response to a gear control command when the electric drive axle is in the fourth gear mode, the first sliding sleeve shifting mechanism 6 is connected to the seventh gear 7 and disconnected from the sixth gear 28; the second sliding sleeve shifting mechanism 24 is connected to the sixteenth gear 23 and disconnected from the fifth gear 10.

[0035] The specific working principle of the control method: When the electric drive axle is in the neutral mode, the first sliding sleeve shifting mechanism 6 is disconnected from both the seventh gear 7 and the sixth gear 28, and the second sliding sleeve shifting mechanism 24 is disconnected from both the fifth gear 10 and the sixteenth gear 23. The power of the first motor 30 is not output from the first output shaft 22 and the second output shaft 9 of the electric drive axle, and the power can be transmitted from the second motor 16 along the twelfth gear 12, the fourteenth gear 11, the thirteenth gear 18, the fifteenth gear 20, and the differential 21 to the first output shaft 22 and the second output shaft 9.

[0036] When the electric drive axle is in the first gear mode, the first sliding sleeve shifting mechanism 6 is connected to the seventh gear 7, and the second sliding sleeve shifting mechanism 24 is connected to the fifth gear 10. The power of the first motor 30 is transmitted along the first gear 1, the third gear 3, the fourth gear 4, the seventh gear 7, the fifth gear 10, the ninth gear 27 and the eleventh gear 14, the eighth gear 25 and the tenth gear 17, the sixteenth gear 23, and the differential 21 to the first output shaft 22 and the second output shaft 9. The power of the second motor 16 is transmitted along the twelfth gear 12, the fourteenth gear 11, the thirteenth gear 18, the fifteenth gear 20, and the differential 21 to the first output shaft 22 and the second output shaft 9.

[0037] When the electric drive axle is in the second gear mode, the first sliding sleeve shifting mechanism 6 is connected to the sixth gear 28, and the second sliding sleeve shifting mechanism 24 is connected to the fifth gear 10. The power of the first motor 30 is transmitted along the first gear 1, the third gear 3, the second gear 29, the sixth gear 28, the fifth gear 10, the ninth gear 27 and the eleventh gear 14, the eighth gear 25 and the tenth gear 17, the sixteenth gear 23, and the differential 21 to the first output shaft 22 and the second output shaft 9. The power of the second motor 16 is transmitted along the twelfth gear 12, the fourteenth gear 11, the thirteenth gear 18, the fifteenth gear 20, and the differential 21 to the first output shaft 22 and the second output shaft 9.

[0038] When the electric drive axle is in the third gear mode, the first sliding sleeve shifting mechanism 6 is connected to the sixth gear 28, and the second sliding sleeve shifting mechanism 24 is connected to the sixteenth gear 23. The power of the first motor 30 is transmitted along the first gear 1, the third gear 3, the second gear 29, the sixth gear 28, the sixteenth gear 23, and the differential 21 to the first output shaft 22 and the second output shaft 9. The power of the second motor 16 is transmitted along the twelfth gear 12, the fourteenth gear 11, the thirteenth gear 18, the fifteenth gear 20, and the differential 21 to the first output shaft 22 and the second output shaft 9.

[0039] When the electric drive axle is in the fourth gear mode, the first sliding sleeve shifting mechanism 6 is connected to the seventh gear 7, and the second sliding sleeve shifting mechanism 24 is connected to the sixteenth gear 23. The power of the first motor 30 is transmitted along the first gear 1, the third gear 3, the fourth gear 4, the seventh gear 7, the sixteenth gear 23, and the differential 21 to the first output shaft 22 and the second output shaft 9. The power of the second motor 16 is transmitted along the twelfth gear 12, the fourteenth gear 11, the thirteenth gear 18, the fifteenth gear 20, and the differential 21 to the first output shaft 22 and the second output shaft 9.

[0040] When the electric drive axle is in different gear positions and the neutral position, power can be transmitted from the second motor to the first and second output shafts, and the transmission paths are the same.

[0041] See Figure 2 The power transmission route diagram of the neutral position shown. In this gear position, the output power of the second motor 16 is transmitted through the motor second output shaft 13 to the twelfth gear 12, then through the fourteenth gear 11 to the fourth intermediate shaft 19, then by the thirteenth gear 18 to the fifteenth gear 20, and then through the differential 21 to the first output shaft 22 and the second output shaft 9.

[0042] See Figure 3 The power transmission route diagram of the first gear shown. In this gear position, the output power of the first motor 30 is transmitted through the motor first output shaft 2 to the first gear 1, then through the third gear 3 to the first intermediate shaft 5, then by the fourth gear 4 to the seventh gear 7, then through the sleeve shaft 8 to the fifth gear 10, and then respectively by the ninth gear 27 and the eleventh gear 14 through the second intermediate shaft 26 and the third intermediate shaft 15 to the eighth gear 25 and the tenth gear 17, and then through the sixteenth gear 23 to the differential 21, and then output from the first output shaft 22 and the second output shaft 9. The output power of the second motor 16 is transmitted through the motor second output shaft 13 to the twelfth gear 12, then through the fourteenth gear 11 to the fourth intermediate shaft 19, then by the thirteenth gear 18 to the fifteenth gear 20, and then through the differential 21 to the first output shaft 22 and the second output shaft 9.

[0043] See Figure 4The power transmission route diagram for the second gear is shown. In this gear position, the output power of the first motor 30 is transmitted through the first motor output shaft 2 to the first gear 1, then through the third gear 3 to the first intermediate shaft 5, then by the second gear 29 to the sixth gear 28, then through the sleeve shaft 8 to the fifth gear 10, and then respectively by the ninth gear 27 and the eleventh gear 14 through the second intermediate shaft 26 and the third intermediate shaft 15 to the eighth gear 25 and the tenth gear 17, and then through the sixteenth gear 23 to the differential 21, and then output from the first output shaft 22 and the second output shaft 9. The output power of the second motor 16 is transmitted through the second motor output shaft 13 to the twelfth gear 12, then through the fourteenth gear 11 to the fourth intermediate shaft 19, then by the thirteenth gear 18 to the fifteenth gear 20, and then through the differential 21 to the first output shaft 22 and the second output shaft 9.

[0044] See Figure 5 The power transmission route diagram for the third gear is shown. In this gear position, the output power of the first motor 30 is transmitted through the first motor output shaft 2 to the first gear 1, then through the third gear 3 to the first intermediate shaft 5, then by the second gear 29 to the sixth gear 28, then through the sleeve shaft 8 to the sixteenth gear 23, and then through the differential 21 to the first output shaft 22 and the second output shaft 9. The output power of the second motor 16 is transmitted through the second motor output shaft 13 to the twelfth gear 12, then through the fourteenth gear 11 to the fourth intermediate shaft 19, then by the thirteenth gear 18 to the fifteenth gear 20, and then through the differential 21 to the first output shaft 22 and the second output shaft 9.

[0045] See Figure 6 The power transmission route diagram for the fourth gear is shown. In this gear position, the output power of the first motor 30 is transmitted through the first motor output shaft 2 to the first gear 1, then through the third gear 3 to the first intermediate shaft 5, then by the fourth gear 4 to the seventh gear 7, then through the sleeve shaft 8 to the sixteenth gear 23, and then through the differential 21 to the first output shaft 22 and the second output shaft 9. The output power of the second motor 16 is transmitted through the second motor output shaft 13 to the twelfth gear 12, then through the fourteenth gear 11 to the fourth intermediate shaft 19, then by the thirteenth gear 18 to the fifteenth gear 20, and then through the differential 21 to the first output shaft 22 and the second output shaft 9.

[0046] In this embodiment, the electric drive axle further includes a shift control unit electrically connected to the first sliding sleeve shift mechanism 6 and the second sliding sleeve shift mechanism 24. The shift control unit is configured to, in the neutral mode, control the first sliding sleeve shift mechanism 6 to disconnect from both the sixth gear 28 and the seventh gear 7, and control the second sliding sleeve shift mechanism 24 to disconnect from both the sixteenth gear 23 and the fifth gear 10; in the first gear mode, control the first sliding sleeve shift mechanism 6 to connect to the seventh gear 7, and control the second sliding sleeve shift mechanism 24 to connect to the fifth gear 10; in the second gear mode, control the first sliding sleeve shift mechanism 6 to connect to the sixth gear 28, and control the second sliding sleeve shift mechanism 24 to connect to the fifth gear 10; in the third gear mode, control the first sliding sleeve shift mechanism 6 to connect to the sixth gear 28, and control the second sliding sleeve shift mechanism 24 to connect to the sixteenth gear 23; in the fourth gear mode, control the first sliding sleeve shift mechanism 6 to connect to the seventh gear 7, and control the second sliding sleeve shift mechanism 24 to connect to the sixteenth gear 23, which is simple to operate.

[0047] Embodiment 3 is based on the same inventive concept as other embodiments. This embodiment introduces an electric vehicle, including the multi-speed electric drive axle with dual motors arranged on both sides described in Embodiment 1.

[0048] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code.

[0049] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more of the processes or multiple processes and / or blocks Figure 1 one or more of the blocks or multiple blocks.

[0050] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in the process Figure 1One process or multiple processes and / or boxes Figure 1 The functions specified in one box or multiple boxes.

[0051] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one process Figure 1 One process or multiple processes and / or boxes Figure 1 The steps of the functions specified in one box or multiple boxes.

[0052] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A multi-speed electric drive axle with dual motors arranged on both sides, characterized in that, Comprising: A first motor MG1 (30), a multi-speed transmission, a differential (21), a second motor MG2 (16), a speed reducer, and an output shaft; The first motor MG1 (30) and the second motor MG2 (16) are arranged on both sides of the output shaft; The output shaft includes: a first output shaft (22) and a second output shaft (9); The first motor MG1 (30) is drivingly connected to the differential (21) through the multi-speed transmission; The second motor MG2 (16) is drivingly connected to the differential (21) through the speed reducer; The differential (21) is respectively drivingly connected to the first output shaft (22) and the second output shaft (9). The first output shaft (22) is used to drive one side of the wheels to rotate, and the second output shaft (9) is used to drive the other side of the wheels to rotate.

2. The multi-speed electric drive axle with double motors arranged on both sides according to claim 1, wherein, The multi-speed transmission includes: A first motor output shaft (2), the first motor output shaft (2) is drivingly connected to the first motor MG1 (30), and a first gear (1) is provided on the first motor output shaft (2); A first intermediate shaft (5), a second gear (29), a third gear (3), and a fourth gear (4) are provided on the first intermediate shaft (5), and the third gear (3) meshes with the first gear (1); A sleeve shaft (8), a fifth gear (10), a sixth gear (28), and a seventh gear (7) are provided on the sleeve shaft (8), the sixth gear (28) meshes with the second gear (29); the seventh gear (7) meshes with the fourth gear (4); A first sliding sleeve shifting mechanism (6), the first sliding sleeve shifting mechanism (6) is connected to the sleeve shaft (8), and the first sliding sleeve shifting mechanism (6) is controlled to be connected to or disconnected from the sixth gear (28) and the seventh gear (7); A second sliding sleeve shifting mechanism (24), the second sliding sleeve shifting mechanism (24) is connected to the sleeve shaft (8), and the second sliding sleeve shifting mechanism (24) is controlled to be connected to or disconnected from the fifth gear (10); A second intermediate shaft (26), an eighth gear (25) and a ninth gear (27) are provided on the second intermediate shaft (26), and the ninth gear (27) meshes with the fifth gear (10); A third intermediate shaft (15), a tenth gear (17) and an eleventh gear (14) are provided on the third intermediate shaft (15), and the eleventh gear (14) meshes with the fifth gear (10).

3. The multi-speed electric drive axle with dual motors arranged on both sides according to claim 1, wherein, The speed reducer includes: A second motor output shaft (13), the second motor output shaft (13) is drivingly connected to the second motor MG2 (16), and a twelfth gear (12) is provided on the second motor output shaft (13); A fourth intermediate shaft (19), a thirteenth gear (18) and a fourteenth gear (11) are provided on the fourth intermediate shaft (19), and the fourteenth gear (11) meshes with the twelfth gear (12).

4. The multi-speed electric drive axle with double motors arranged on both sides according to claim 2, characterized in that, A sixteenth gear (23) is provided on the differential (21). The sixteenth gear (23) meshes with the eighth gear (25), and the sixteenth gear (23) meshes with the tenth gear (17). The second sliding sleeve shifting mechanism (24) is controlled to be connected to or disconnected from the sixteenth gear (23).

5. The multi-speed electric drive axle with double motors arranged on both sides according to claim 3, characterized in that, A fifteenth gear (20) is provided on the differential (21). The fifteenth gear (20) meshes with the thirteenth gear (18).

6. The multi-speed electric drive axle with double motors arranged on both sides according to claim 1, wherein The first output shaft (22) and the second output shaft (9) are on the same straight line. The first motor MG1 (30) and the multi-speed transmission, and the second motor MG2 (16) and the reducer are evenly arranged on both sides of the straight line, and the overall center of the first motor MG1 (30) and the multi-speed transmission and the second motor MG2 (16) and the reducer is close to the straight line.

7. The multi-speed electric drive axle with dual motors arranged on both sides according to claim 4, wherein It further includes a shifting control unit electrically connected to the first sliding sleeve shifting mechanism (6) and the second sliding sleeve shifting mechanism (24). The shifting control unit is used to respectively control the connection or disconnection of the sixth gear (28), the seventh gear (7) and the first sliding sleeve shifting mechanism (6); the shifting control unit is also used to control the connection or disconnection of the fifth gear (10), the sixteenth gear (23) and the second sliding sleeve shifting mechanism (24).

8. The multi-speed electric drive axle with dual motors arranged on both sides according to claim 2, wherein The differential uses a differential with a differential lock function.

9. A control method for a multi-speed electric drive axle with dual motors arranged on both sides as claimed in claim 7, characterized in that, It includes: Obtain a gear control command; Control the first sliding sleeve shifting mechanism (6) and the second sliding sleeve shifting mechanism (24) according to the gear control command, including: In response to the gear control command when the electric drive axle is in the neutral mode, the first sliding sleeve shifting mechanism (6) is disconnected from both the sixth gear (28) and the seventh gear (7); the second sliding sleeve shifting mechanism (24) is disconnected from both the fifth gear (10) and the sixteenth gear (23); In response to the gear control command when the electric drive axle is in the first gear mode, the first sliding sleeve shifting mechanism (6) is connected to the seventh gear (7) and disconnected from the sixth gear (28); the second sliding sleeve shifting mechanism (24) is connected to the fifth gear (10) and disconnected from the sixteenth gear (23); In response to the gear control command when the electric drive axle is in the second gear mode, the first sliding sleeve shifting mechanism (6) is connected to the sixth gear (28) and disconnected from the seventh gear (7); the second sliding sleeve shifting mechanism (24) is connected to the fifth gear (10) and disconnected from the sixteenth gear (23); In response to the gear control command when the electric drive axle is in the third gear mode, the first sliding sleeve shifting mechanism (6) is connected to the sixth gear (28) and disconnected from the seventh gear (7); the second sliding sleeve shifting mechanism (24) is connected to the sixteenth gear (23) and disconnected from the fifth gear (10); In response to a gear control instruction for the electric drive axle to be in the fourth gear mode, the first sliding sleeve shifting mechanism (6) is connected to the seventh gear (7) and disconnected from the sixth gear (28); the second sliding sleeve shifting mechanism (24) is connected to the sixteenth gear (23) and disconnected from the fifth gear (10).

10. An electric vehicle, characterized in that, It includes a multi-speed electric drive axle with dual motors arranged on both sides according to any one of claims 1-8.

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