Transverse torque vector transmission of three-motor hybrid electric vehicle

Abstract

The invention discloses a transverse torque vector transmission of a three-motor hybrid electric vehicle. The transverse torque vector transmission comprises a first driving motor, a second driving motor, an engine, a generator, a left middle shaft system, a right middle shaft system and a planet row transmission system. On the basis of a dual-motor hybrid power speed reducer, torque vector distribution and engine power coupling are achieved through a planet row transmission system and a driving motor, torque can be accurately transmitted to each driving wheel, the harsh requirement of people for vehicle controllability is effectively met, and through application of a plurality of working modes, the reliability of the hybrid power speed reducer is improved. By means of the method, the vehicle can adapt to various working conditions, it is guaranteed that the vehicle has good fuel economy, the torque vector distribution function is achieved, the steering effect of the vehicle is improved, the dynamic performance of the vehicle is stabilized, the vehicle is helped to bend, the operation intensity of a driver is reduced, the insufficient steering phenomenon of the vehicle can be reduced, and the dynamic performance of the vehicle is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hybrid vehicle transmissions, and in particular relates to a transverse torque vector transmission for a three-motor hybrid vehicle. Background Art

[0002] At present, against the backdrop of the energy and environmental crisis, automobile companies around the world are vigorously promoting the research and development of new energy vehicles, especially electric vehicles and hybrid vehicles. The electrification of power systems has become an irreversible technological trend. At present, pure electric vehicles still have problems such as short battery life, long charging time, and short battery life. Hybrid vehicles still dominate the market. Therefore, major automobile manufacturers focus their investment on developing advanced hybrid systems. The configuration of the hybrid system determines the performance of hybrid vehicles in terms of power, economy, and other aspects.

[0003] There are three main schemes for dual-motor hybrid systems: series, parallel and hybrid. The hybrid technology route here is divided into electronically controlled stepless (ECVT) hybrid system and series and parallel structure hybrid system. Among them, the electronically controlled stepless (ECVT) technology represented by a certain company's THS system is highly complex, difficult to manufacture, and expensive, and it cannot achieve complete decoupling of the engine and motor drive, and cannot achieve the best fuel economy; the series-parallel system represented by a certain company's IMMD technology has a simple structure, can achieve complete decoupling of the engine drive and the motor drive, and has good fuel economy, but compared with the THS power split configuration, its generator can only be used for power generation, and cannot output torque to the wheel end together with the drive motor, and the power cannot be fully utilized. In addition, the engine drive route and the engine power generation route of this configuration are both single gears, which cannot take into account both the engine direct drive economy at high speed and the parallel drive power at low speed, and at the same time cannot fully utilize the efficient working range of the generator power generation. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a transverse torque vectoring transmission for a three-motor hybrid vehicle. On the basis of a dual-motor hybrid reducer, a drive motor is added through a planetary gearbox to realize torque vectoring distribution and couple the engine power. The torque can be accurately transmitted to each drive wheel, effectively meeting people's stringent requirements for vehicle maneuverability. Through the application of multiple working modes, the present invention can enable the vehicle to adapt to various working conditions, ensure that the vehicle has good fuel economy, and has a torque vectoring distribution function, which increases the steering effect of the vehicle, stabilizes the dynamic performance of the vehicle, helps the vehicle enter a corner, reduces the driver's operating intensity, and can reduce the understeering phenomenon of the vehicle, thereby improving the dynamic performance of the vehicle.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A three-motor hybrid electric vehicle transverse torque vector transmission, comprising a first drive motor, a second drive motor, an engine, a generator, a left intermediate shaft system, a right intermediate shaft system, and a planetary gear transmission system; the first drive motor and the second drive motor are arranged in a left-right symmetrical manner, the planetary gear transmission system itself is a left-right symmetrical structure, the planetary gear transmission system comprises a sun gear shaft, a sun gear input gear, a left planetary gear, a right planetary gear and a brake, the left planetary gear and the right planetary gear have the same structure and are symmetrically arranged at the left and right ends of the sun gear shaft, the sun gear input gear is installed in the middle of the sun gear shaft, and the brake Installed on the sun gear shaft to control the locking or releasing of the sun gear shaft; the driving motor shaft of the No. 1 driving motor is connected to the left planetary gear through the left intermediate shaft system; the driving motor shaft of the No. 2 driving motor is connected to the right planetary gear through the right intermediate shaft system, and the left intermediate shaft system and the right intermediate shaft system have the same structure and are symmetrically arranged; the engine shaft of the engine is connected to the generator shaft of the generator through the No. 6 gear pair, and the engine shaft is connected to the sun gear shaft of the planetary gear transmission system through the No. 5 gear pair, and a synchronizer is provided on the engine shaft to control its connection or disconnection with the No. 5 gear pair.

[0007] Furthermore, the left intermediate shaft system has the same structure as the right intermediate shaft system. The left intermediate shaft system includes an intermediate shaft, which is transmission-connected to the drive motor shaft through a No. 1 gear pair, and the intermediate shaft is transmission-connected to the left planetary gear through a No. 2 gear pair.

[0008] Furthermore, the drive motor shaft, engine shaft, intermediate shaft, sun gear shaft and generator shaft are arranged parallel to each other.

[0009] Furthermore, the left planetary gear row includes a ring gear, a planet carrier, a plurality of planetary gears mounted on the planet carrier, and a left sun gear; the ring gear is connected to the intermediate shaft of the left intermediate shaft system through a No. 2 gear pair, a plurality of planetary gears are meshed with the ring gear for transmission, and the left sun gear is fixed on the sun gear shaft and meshed with a plurality of planetary gears for transmission.

[0010] Furthermore, an engine first gear is provided on the engine shaft of the engine, the engine first gear is meshed with the sun gear shaft to form the fifth gear pair, and the synchronizer is used to control the engagement or disconnection of the engine shaft and the engine first gear.

[0011] Furthermore, when the transmission is in the idle power generation working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor and the No. 2 drive motor are not working, the engine and the generator are in a working state, and the driving force output by the engine is transmitted to the engine shaft and then transmitted to the generator shaft through the No. 6 gear pair, driving the generator to convert the driving force of the engine into electricity, thereby realizing idle power generation;

[0012] When the transmission is in the stop-start working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor and the No. 2 drive motor are not working, the engine and the generator are in a working state, and the driving force output by the generator is transmitted to the generator shaft, and then transmitted to the engine shaft through the No. 6 gear pair, and then transmitted to the engine to start the engine.

[0013] Furthermore, when the transmission is in the pure electric drive working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor and the No. 2 drive motor are in a working state, the engine and the generator are not working, and the driving force output by the No. 1 drive motor and the No. 2 drive motor is transmitted to the drive motor shaft, and then transmitted to the left and right planetary gears through the intermediate shaft system, and then transmitted to the wheels, realizing pure electric drive of the vehicle; in this working mode, the sun gear shaft, the engine shaft and the generator shaft do not rotate.

[0014] Furthermore, when the transmission is in the series drive working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor, No. 2 drive motor, engine and generator are all in a working state, and the driving force output by the engine is transmitted to the engine shaft, and then transmitted to the generator shaft through the No. 6 gear pair, driving the generator to convert the driving force of the engine into electricity, and the converted electricity directly acts on the No. 1 drive motor and the No. 2 drive motor to generate driving force. After the driving force output by the No. 1 drive motor and the No. 2 drive motor is transmitted to the drive motor shaft, it is transmitted to the left and right planetary gears through the intermediate shaft system, and then transmitted to the wheels, thereby realizing the series drive of the vehicle.

[0015] Furthermore, when the transmission is in the parallel drive working mode: the brake is in a released state, the synchronizer is in an engaged state, the No. 1 drive motor, the No. 2 drive motor and the engine are in working state, the generator works selectively, and the driving force output by the No. 1 drive motor and the No. 2 drive motor is transmitted to the drive motor shaft, and then transmitted to the left and right side planetary gears through the intermediate shaft system; the driving force output by the engine is transmitted to the engine shaft, and then transmitted to the No. 5 gear pair through the synchronizer, and then transmitted to the sun gear shaft through the No. 5 gear pair, and then transmitted to the left and right side planetary gears, and then transmitted to the wheels, thereby realizing parallel drive of the vehicle.

[0016] Furthermore, when the transmission is in the braking energy recovery working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor and the No. 2 drive motor are in a working state, the engine and the generator are not working, and the driving force from the wheel end is transmitted to the left and right planetary gears, and then transmitted to the drive motor shaft through the intermediate shaft system, and acts in the opposite direction to the No. 1 drive motor and the No. 2 drive motor. At this time, the No. 1 drive motor and the No. 2 drive motor are in a power generation state, charging the energy storage device to achieve braking energy recovery.

[0017] The present invention has the following advantages:

[0018] The present invention provides a transverse torque vector transmission for a three-motor hybrid vehicle, comprising a first drive motor, a second drive motor, an engine, a generator, an intermediate shaft transmission system, and a planetary gear transmission system. The drive motor shaft, the engine shaft, the generator shaft, the intermediate shaft, and the sun gear shaft of the planetary gear transmission system are arranged in parallel and transmission-connected to each other, thereby achieving a transverse configuration with a high degree of integration.

[0019] The present invention provides a brake on the sun gear shaft and a clutch on the engine shaft, so that the transverse torque vector transmission of the three-motor hybrid vehicle can operate in multiple working modes.

[0020] The present invention enables the vehicle to work in different working modes, can ensure that the vehicle has good fuel economy, can greatly improve the vehicle's power, and has functions such as braking energy recovery.

[0021] By applying brakes and synchronizers, the present invention can disconnect the shaft system, engine, and motor that are not involved in driving or generating electricity in different working modes, thereby reducing the drag loss caused by rotation and lowering the system's requirements for the controller's electronic control module.

[0022] The present invention uses a planetary gear transmission system to simultaneously achieve torque vector distribution between two drive motors and selectively couple engine power, thereby taking into account the dynamic performance of the vehicle and significantly improving the power through the coupling of engine power. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of the structure of a transverse torque vectoring transmission for a three-motor hybrid vehicle according to an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the working principle of the transverse torque vectoring transmission of a three-motor hybrid vehicle in an idle power generation working mode according to an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the working principle of the transverse torque vectoring transmission of a three-motor hybrid vehicle in a stop-start working mode according to an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the working principle of the transverse torque vectoring transmission of a three-motor hybrid vehicle in a pure electric drive working mode according to an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the working principle of the transverse torque vectoring transmission of a three-motor hybrid vehicle in a series drive working mode according to an embodiment of the present invention;

[0029] Figure 6 It is a schematic diagram of the working principle of the transverse torque vectoring transmission of a three-motor hybrid vehicle in a parallel drive working mode according to an embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of the working principle of the transverse torque vectoring transmission of a three-motor hybrid vehicle in a braking energy recovery working mode according to an embodiment of the present invention;

[0031] In the figure:

[0032] 1- No. 1 driving motor; 2- No. 2 driving motor; 3- engine; 4- generator;

[0033] 10-driving motor shaft; 11-driving motor gear;

[0034] 20-intermediate shaft; 21-intermediate shaft first gear; 22-intermediate shaft second gear;

[0035] 30-gear ring;

[0036] 40-planet carrier; 41-planet gear;

[0037] 50-sun gear shaft; 51-sun gear left gear; 52-sun gear right gear; 53-sun gear input gear; 54-brake;

[0038] 60-engine shaft; 61-engine first gear; 62-engine second gear; 63-synchronizer;

[0039] 70-generator shaft; 71-generator gear;

[0040] 81-Gear pair No. 1; 82-Gear pair No. 2; 83-Gear pair No. 3; 84-Gear pair No. 4; 85-Gear pair No. 5; 86-Gear pair No. 6. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "number one", "number two", etc. are only used to distinguish in the description and have no special meaning.

[0044] Example

[0045] like Figure 1As shown, this embodiment is a transverse torque vector transmission for a three-motor hybrid vehicle, comprising a first drive motor 1, a second drive motor 2, an engine 3, a generator 4, a left intermediate shaft system, a right intermediate shaft system, and a planetary gear transmission system; the first drive motor 1 and the second drive motor 2 are arranged in a left-right symmetrical manner, and the planetary gear transmission system itself is a left-right symmetrical structure, and the planetary gear transmission system comprises a sun gear shaft 50, a sun gear input gear 53, a left planetary gear, a right planetary gear, and a brake 53, the left planetary gear and the right planetary gear have the same structure and are symmetrically arranged at the left and right ends of the sun gear shaft 50, the sun gear input gear 53 is installed in the middle of the sun gear shaft 50, and the brake 53 Installed on the sun gear shaft 50, it is used to control the locking or releasing of the sun gear shaft 50; the driving motor shaft 10 of the No. 1 driving motor 1 is connected to the left planetary gear transmission through the left intermediate shaft system; the driving motor shaft of the No. 2 driving motor 2 is connected to the right planetary gear transmission through the right intermediate shaft system, and the left intermediate shaft system and the right intermediate shaft system have the same structure and are symmetrically arranged; the engine shaft 60 of the engine 3 is connected to the generator shaft 70 of the generator through the sixth gear pair 86, and the engine shaft 60 is connected to the sun gear shaft 50 of the planetary gear transmission system through the fifth gear pair 85, and the engine shaft 60 is provided with a synchronizer 63 for controlling its connection or disconnection with the fifth gear pair 85.

[0046] Furthermore, the left intermediate shaft system has the same structure as the right intermediate shaft system. The left intermediate shaft system includes an intermediate shaft 20, which is connected to the drive motor shaft 10 through a first gear pair 81, and the intermediate shaft 20 is connected to the left planetary gear through a second gear pair 82.

[0047] In this embodiment, the first gear pair 81 is formed by the first intermediate shaft gear 21 installed on the intermediate shaft 20 meshing with the drive motor gear 11 installed on the drive motor shaft 10; the second gear pair 82 is formed by the second intermediate shaft gear 22 installed on the intermediate shaft 20 meshing with the ring gear 30 of the left planetary gear.

[0048] Furthermore, the drive motor shaft 10 , the engine shaft 60 , the intermediate shaft 20 , the sun gear shaft 50 and the generator shaft 70 are arranged parallel to each other.

[0049] Furthermore, the left planetary gear row includes a ring gear 30, a planet carrier 40, a plurality of planetary gears 41 mounted on the planet carrier 40, and a left sun gear 51; the ring gear 30 is connected to the intermediate shaft of the left intermediate shaft system through a second gear pair 82, a plurality of planetary gears 41 are meshed with the ring gear 30 for transmission, and the left sun gear 51 is fixed on the sun gear shaft 50 and meshed with the plurality of planetary gears 41 for transmission.

[0050] In this embodiment, the plurality of planetary gears 41 mesh with the ring gear 30 to form the third gear pair 83 ; the sun gear left gear 51 meshes with the plurality of planetary gears 41 to form the fourth gear pair 84 .

[0051] Furthermore, an engine first gear 61 is provided on the engine shaft 60 of the engine 3 , the engine first gear 61 is meshed with the sun gear shaft 50 to form the fifth gear pair 85 , and the synchronizer 63 is used to control the engagement or disconnection of the engine shaft 60 and the engine first gear 61 .

[0052] Furthermore, an engine second gear 62 is provided on the engine shaft 60 of the engine 3, and a generator gear 71 is provided on the generator shaft 70 of the generator 4. The engine second gear 62 is meshed with the generator gear 71 to form the sixth gear pair.

[0053] In this embodiment, because the first drive motor 1 and the second drive motor 2 are arranged symmetrically, the drive motor shaft 10 , the intermediate shaft 20 , the ring gear 30 , and the planetary carrier 40 are also arranged symmetrically and are drivingly connected to the second drive motor 2 and the sun gear shaft 50 .

[0054] The various working modes of the transmission of this embodiment are introduced below:

[0055] Table 1 Control relationship between each transmission working mode and main control components

[0056] Working Mode Idle power generation Stop and start Pure electric drive Series drive Parallel drive Braking energy recovery Drive motor × × √ √ √ √ engine √ √ × √ √ × dynamo √ √ × √ × × Brakes √ √ √ √ × √ Synchronizer × × × × √ ×

[0057] like Figure 2 As shown, when the transmission is in the idle power generation working mode: the brake 54 is in a locked state, the synchronizer 63 is in a disconnected state, the No. 1 drive motor 1 and the No. 2 drive motor 2 are not working, and the engine 3 and the generator 4 are in a working state, wherein the driving force output by the engine 3 is transmitted to the engine shaft 60, and then transmitted to the generator shaft 70 through the No. 6 gear pair 86, driving the generator 4 to convert the driving force of the engine 3 into electricity, thereby realizing idle power generation.

[0058] like Figure 3 As shown, when the transmission is in the stop-start working mode: the brake 54 is in a locked state, the synchronizer 63 is in a disconnected state, the No. 1 drive motor 1 and the No. 2 drive motor 2 are not working, and the engine 3 and the generator 4 are in a working state, wherein the driving force output by the generator 4 is transmitted to the generator shaft 70, and then transmitted to the engine shaft 60 through the No. 6 gear pair 86, and then transmitted to the engine 3 to start the engine 3.

[0059] like Figure 4As shown, when the transmission is in the pure electric drive working mode: the brake 54 is in a locked state, the synchronizer 63 is in a disconnected state, the No. 1 drive motor 1 and the No. 2 drive motor 2 are in a working state, and the engine 3 and the generator 4 are not working. Among them, after the driving force output by the No. 1 drive motor 1 and the No. 2 drive motor 2 is transmitted to the drive motor shaft 10, it is transmitted to the intermediate shaft 20 through the No. 1 gear pair 81, and then transmitted to the ring gear 30 through the No. 2 gear pair 82, and then transmitted to the planetary carrier 40 through the No. 3 gear pair 83, and then transmitted to the wheel, so as to realize the pure electric drive of the vehicle and achieve the effect of zero fuel consumption and zero emission. At the same time, in this working mode, because the brake 54 is in a locked state and the synchronizer 63 is in a disconnected state, the sun gear shaft 50, the engine shaft 60 and the generator shaft 70 do not rotate with it, which can effectively reduce the bearing life loss caused by dragging and idling.

[0060] like Figure 5 As shown, when the transmission is in the serial drive working mode: the brake 54 is in the locked state, the synchronizer 63 is in the disconnected state, the No. 1 drive motor 1, the No. 2 drive motor 2, the engine 3 and the generator 4 are all in the working state, wherein the driving force output by the engine 3 is transmitted to the engine shaft 60, and then transmitted to the generator shaft 70 through the No. 6 gear pair 86, driving the generator 4 to convert the driving force of the engine 3 into electricity, and the converted electricity directly acts on the No. 1 drive motor 1 and the No. 2 drive motor 2 to generate driving force, and the driving force output by the No. 1 drive motor 1 and the No. 2 drive motor 2 is transmitted to the drive motor shaft 10, and then transmitted to the intermediate shaft 20 through the No. 1 gear pair 81, and then transmitted to the ring gear 30 through the No. 2 gear pair 82, and then transmitted to the planetary carrier 40 through the No. 3 gear pair 83, and then transmitted to the wheels, thereby realizing the serial drive of the vehicle. At this time, the engine remains in the high-efficiency range, achieving a higher power generation efficiency.

[0061] like Figure 6As shown, when the transmission is in parallel drive working mode: the brake 54 is in a released state, the synchronizer 63 is in an engaged state, the No. 1 drive motor 1, the No. 2 drive motor 2 and the engine 3 are in working state, and the generator 4 works selectively, wherein the driving force output by the No. 1 drive motor 1 and the No. 2 drive motor 2 is transmitted to the drive motor shaft 10, and then transmitted to the intermediate shaft 20 through the No. 1 gear pair 81, and then transmitted to the ring gear 30 through the No. 2 gear pair 82; the driving force output by the engine 3 is transmitted to the engine shaft 60, and then transmitted to the first engine gear 61 through the synchronizer 63, and then transmitted to the sun gear shaft 50 through the No. 5 gear pair 85; at this time, the power on the drive motor side is transmitted to the planetary carrier 40 through the No. 3 gear pair 83, and the power on the engine side is transmitted to the No. 4 gear pair 84, and then transmitted to the wheels, thereby realizing the parallel drive of the vehicle. This working mode is suitable for working conditions with high vehicle speed and acceleration requirements. At the same time, in this working mode, the engine 3 is maintained in a high efficiency range, and the excess power is selectively transmitted to the generator shaft 70 via the sixth gear pair 86, and then converted into electricity by the generator 3, achieving higher thermal efficiency.

[0062] like Figure 7 As shown, when the transmission is in the braking energy recovery working mode: the brake 54 is in a locked state, the synchronizer 63 is in a disconnected state, the No. 1 drive motor 1 and the No. 2 drive motor 2 are in a working state, the engine 3 and the generator 4 are not working. At this time, the driving force from the wheel end is transmitted to the planetary carrier 40, transmitted to the ring gear 30 through the No. 3 gear pair 83, and then transmitted to the intermediate shaft 20 through the No. 2 gear pair 82, and then transmitted to the drive motor shaft 10 through the No. 1 gear pair 81, and acts in the opposite direction on the No. 1 drive motor 1 and the No. 2 drive motor 2. At this time, the No. 1 drive motor 1 and the No. 2 drive motor 2 are in a power generation state, charging the energy storage device, realizing braking energy recovery, and saving energy consumption of the whole vehicle.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-motor hybrid electric vehicle transverse torque vectoring transmission, characterized in that: The invention comprises a first drive motor, a second drive motor, an engine, a generator, a left intermediate shaft system, a right intermediate shaft system, and a planetary gear transmission system; the first drive motor and the second drive motor are arranged symmetrically, the planetary gear transmission system itself is a left-right symmetrical structure, the planetary gear transmission system comprises a sun gear shaft, a sun gear input gear, a left planetary gear, a right planetary gear, and a brake, the left planetary gear has the same structure as the right planetary gear and is symmetrically arranged at the left and right ends of the sun gear shaft, the sun gear input gear is installed in the middle of the sun gear shaft, and the brake is installed on the sun gear shaft to control the locking or release of the sun gear shaft; the drive motor shaft of the first drive motor is connected to the left planetary gear through the left intermediate shaft system; the drive motor shaft of the second drive motor is connected to the right planetary gear through the right intermediate shaft system, the left intermediate shaft system has the same structure as the right intermediate shaft system and is symmetrically arranged; the engine shaft of the engine is connected to the generator shaft of the generator through the sixth gear pair, the engine shaft is connected to the sun gear shaft of the planetary gear transmission system through the fifth gear pair, and a synchronizer for controlling its connection or disconnection with the fifth gear pair is provided on the engine shaft.

2. A three-motor hybrid electric vehicle transverse torque vectoring transmission as claimed in claim 1, characterized in that: The left intermediate shaft system has the same structure as the right intermediate shaft system. The left intermediate shaft system includes an intermediate shaft, which is connected to the drive motor shaft through a first gear pair, and is connected to the left planetary gear through a second gear pair.

3. A three-motor hybrid electric vehicle transverse torque vectoring transmission as claimed in claim 2, characterized in that: The drive motor shaft, engine shaft, intermediate shaft, sun gear shaft and generator shaft are arranged parallel to each other.

4. The three-motor hybrid electric vehicle transverse torque vectoring transmission as claimed in claim 1, characterized in that: The left planetary gear row includes a ring gear, a planet carrier, a plurality of planetary gears mounted on the planet carrier, and a left sun gear; the ring gear is connected to the intermediate shaft of the left intermediate shaft system through a No. 2 gear pair, a plurality of planetary gears are meshed with the ring gear for transmission, and the left sun gear is fixed on the sun gear shaft and meshed with a plurality of planetary gears for transmission.

5. The three-motor hybrid electric vehicle transverse torque vectoring transmission as claimed in claim 1, characterized in that: The engine shaft of the engine is provided with an engine first gear, which is meshed with the sun gear shaft to form the fifth gear pair, and the synchronizer is used to control the engagement or disconnection of the engine shaft and the engine first gear.

6. A three-motor hybrid electric vehicle transverse torque vectoring transmission as claimed in claim 1, characterized in that: When the transmission is in the idle power generation working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor and the No. 2 drive motor are not working, the engine and the generator are in a working state, and the driving force output by the engine is transmitted to the engine shaft and then transmitted to the generator shaft through the No. 6 gear pair, driving the generator to convert the driving force of the engine into electricity, thereby realizing idle power generation; When the transmission is in the stop-start working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor and the No. 2 drive motor are not working, the engine and the generator are in a working state, and the driving force output by the generator is transmitted to the generator shaft, and then transmitted to the engine shaft through the No. 6 gear pair, and then transmitted to the engine to start the engine.

7. The three-motor hybrid electric vehicle transverse torque vectoring transmission as claimed in claim 1, characterized in that: When the transmission is in the pure electric drive working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor and the No. 2 drive motor are in a working state, the engine and the generator are not working, and the driving force output by the No. 1 drive motor and the No. 2 drive motor is transmitted to the drive motor shaft, and then transmitted to the left and right planetary gears through the intermediate shaft system, and then transmitted to the wheels, realizing the pure electric drive of the vehicle; in this working mode, the sun gear shaft, the engine shaft and the generator shaft do not rotate.

8. The three-motor hybrid electric vehicle transverse torque vectoring transmission as claimed in claim 1, characterized in that: When the transmission is in the series drive working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor, the No. 2 drive motor, the engine and the generator are all in a working state, the driving force output by the engine is transmitted to the engine shaft, and then transmitted to the generator shaft through the No. 6 gear pair, driving the generator to convert the driving force of the engine into electricity, and the converted electricity directly acts on the No. 1 drive motor and the No. 2 drive motor to generate driving force, and the driving force output by the No. 1 drive motor and the No. 2 drive motor is transmitted to the drive motor shaft, and then transmitted to the left and right planetary gears through the intermediate shaft system, and then transmitted to the wheels, thereby realizing the series drive of the vehicle.

9. The three-motor hybrid vehicle transverse torque vectoring transmission as claimed in claim 1, characterized in that: When the transmission is in the parallel drive working mode: the brake is in a released state, the synchronizer is in an engaged state, the No. 1 drive motor, the No. 2 drive motor and the engine are in working state, the generator works selectively, and the driving force output by the No. 1 drive motor and the No. 2 drive motor is transmitted to the drive motor shaft, and then transmitted to the left and right side planetary gears through the intermediate shaft system; the driving force output by the engine is transmitted to the engine shaft, and then transmitted to the No. 5 gear pair through the synchronizer, and then transmitted to the sun gear shaft through the No. 5 gear pair, and then transmitted to the left and right side planetary gears, and then transmitted to the wheels, thereby realizing the parallel drive of the vehicle.

10. The three-motor hybrid electric vehicle transverse torque vectoring transmission as claimed in claim 1, characterized in that: When the transmission is in the braking energy recovery working mode: the brake is in a locked state, the synchronizer is in a disconnected state, the No. 1 drive motor and the No. 2 drive motor are in a working state, the engine and the generator are not working, and the driving force from the wheel end is transmitted to the left and right planetary gears, and then transmitted to the drive motor shaft through the intermediate shaft system, and acts in the opposite direction to the No. 1 drive motor and the No. 2 drive motor. At this time, the No. 1 drive motor and the No. 2 drive motor are in a power generation state, charging the energy storage device to achieve braking energy recovery.

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