Parallel dual-motor hybrid power driving system and method

Abstract

The invention belongs to the field of driving systems, and particularly relates to a parallel dual-motor hybrid power driving system and method. The system comprises a clutch module, an electric drive module and a gearbox module which are sequentially connected in series. The input end of the clutch module is connected with the power output end of a vehicle engine; the electric driving module comprises a driving motor unit, a power generation motor unit and a control unit; the output end of the driving motor unit is connected with the first connecting end of the gearbox module; the connecting end of the power generation motor unit is connected with the output end of the clutch module; the control unit is used for controlling connection or disconnection between the output end of the clutch module and the first connecting end of the gearbox module; the second connecting end of the gearbox module is connected with the wheel end of the vehicle. By means of the structural form of power source parallel connection and overall series connection, modular assembly can be achieved, the structural design is more reasonable, the overall structure of the driving system is simpler, and the cost is lower.

Description

Technical Field

[0001] The present invention relates to a driving system and method, and in particular to a driving system and method for a parallel dual-motor hybrid power. Background Art

[0002] Existing new energy vehicle drive systems can be categorized by energy source as either pure electric or hybrid. Pure electric drive systems rely entirely on electric motors for power, offering significant advantages in reducing operating costs. However, vehicle operation is often limited by battery capacity and charging time. This is particularly true for commercial vehicles, which are heavy and carry a large payload. Pure electric drive significantly limits their range, leading to pure electric use being primarily used for short-distance transport or fixed-use operations. To achieve longer range and lower operating costs, hybrid drive presents a superior drive solution.

[0003] Common hybrid drive configurations include series, parallel, and hybrid. In a series configuration, the engine does not directly drive the wheels, allowing it to consistently operate within its high-efficiency range. All of the mechanical energy generated is converted into electrical energy, which is then converted back into mechanical energy by the drive motor to power the vehicle. This improves fuel economy while simplifying the design and making control strategies easier to implement, as seen in extended-range electric vehicles. However, the series configuration requires two energy conversions: mechanical energy to electrical energy to mechanical energy, resulting in significant energy losses during these conversions. The parallel configuration offers a variety of operating modes, including pure electric, pure fuel, and hybrid drive. Its structure is relatively simple and cost-effective. Under high loads, the motor and engine operate simultaneously, providing high torque. However, when direct engine drive is required, it cannot consistently maintain the engine's high efficiency compared to a hybrid configuration. The hybrid configuration's greatest advantage is power splitting. A planetary gear set transmits engine power to the transmission and motor, allowing the drive motor to adjust engine speed to match vehicle speed, consistently maintaining the engine within its high-efficiency range. However, the hybrid configuration is complex, has high barriers to entry, and is expensive.

[0004] Chinese patent CN118927996A discloses a multi-mode hybrid powertrain system with a combination of series-parallel and input power split modes. The system includes a first power source, a second power source, a third power source, a planetary gear mechanism, a fixed gear train, two clutches, a transmission shaft, and an output shaft. However, this hybrid powertrain system still suffers from issues such as a complex overall structure.

[0005] Considering the advantages and disadvantages of the above structures, a drive system with simple structure, good fuel economy and good power is a product that needs to be developed urgently. Summary of the Invention

[0006] The purpose of the present invention is to solve the technical problems of the overall complexity of the hybrid structure, high barriers and costs in existing hybrid power systems, and to provide a parallel dual-motor hybrid drive system and method.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A parallel dual-motor hybrid drive system, which is special in that:

[0009] It includes a clutch module, an electric drive module and a gearbox module connected in series;

[0010] The input end of the clutch module is connected to the power output end of the vehicle engine;

[0011] The electric drive module includes a drive motor unit, a generator motor unit and a control unit;

[0012] The output end of the drive motor unit is connected to the first connection end of the gearbox module, and is used to provide pure electric power to the gearbox module and generate electricity through the power transmitted back from the gearbox module in the power recovery mode;

[0013] The connection end of the generator motor unit is connected to the output end of the clutch module, and is used to generate electricity through the power output from the output end of the clutch module. At the same time, when working in the dual-motor drive mode, it and the drive motor unit jointly provide power to the gearbox module;

[0014] The control unit is used to control the connection or disconnection between the clutch module output end and the first connection end of the transmission module, thereby controlling the on-off of the power transmission path between the vehicle engine and the generator motor and the transmission module;

[0015] The second connection end of the transmission module is connected to the wheel end of the vehicle.

[0016] Furthermore, the driving motor unit includes a driving motor and a driving gear; the generator motor unit includes a generator motor and a generator gear; and the control unit is a shift mechanism;

[0017] The transmission module includes a transmission gear and a transmission gear set connected to the transmission gear via a transmission connecting shaft; the transmission gear is the first connection end of the transmission module, and the transmission gear set is the second connection end of the transmission module;

[0018] The clutch module includes a clutch body, a clutch connecting shaft and a clutch gear; the clutch body is sleeved on one end of the clutch connecting shaft, and the clutch gear is installed on the other end of the clutch connecting shaft; one end of the clutch connecting shaft is connected to the power output end of the vehicle engine;

[0019] The driving gear is mounted on the driving shaft of the driving motor and meshes with the gear of the transmission;

[0020] The power generation gear is mounted on the driving shaft of the power generation motor and meshes with the clutch gear;

[0021] The shift mechanism is used to control the connection or disconnection between the transmission gear and the clutch gear.

[0022] Furthermore, the clutch connecting shaft is coaxially arranged with the gearbox connecting shaft, and the drive motor and the generator motor are respectively arranged on both sides of the clutch connecting shaft.

[0023] Furthermore, the shift mechanism includes a shift sleeve;

[0024] The shift sleeve is mounted on the meshing spline of the transmission gear or the meshing spline of the clutch gear;

[0025] The outer wall of the shift sleeve is connected to the external shift lever, and is used to shift the shift sleeve laterally through the shift lever, so that the shift sleeve is located on the meshing spline of the transmission gear or the meshing spline of the clutch gear, thereby putting the transmission gear and the clutch gear in a disconnected state; or so that the two ends of the shift sleeve are respectively engaged with the meshing spline of the transmission gear and the meshing spline of the clutch gear, thereby putting the transmission gear and the clutch gear in a connected state.

[0026] Furthermore, the transmission gear set is a double intermediate shaft structure and is a four-speed transmission gear set.

[0027] At the same time, the present invention also provides a driving method of a parallel dual-motor hybrid power system, which is based on the aforementioned parallel dual-motor hybrid power system and has the following characteristics:

[0028] A. Pure electric mode

[0029] a1. Single motor drive mode

[0030] The drive motor unit outputs power to the transmission module, which then outputs the power to the vehicle's wheels.

[0031] a2. Dual motor drive mode

[0032] Ⅰ. Controlling the clutch module output terminal and the transmission module first connection terminal to be in a connection state through the control unit;

[0033] II. The drive motor unit and the generator motor unit output power to the transmission module, which then outputs the power to the vehicle's wheels.

[0034] B. Engine direct drive mode;

[0035] Ⅰ. Controlling the clutch module output terminal and the transmission module first connection terminal to be in a connection state through the control unit;

[0036] II. The vehicle engine outputs power, which is then passed through the clutch module and the transmission module to the vehicle's wheels. Meanwhile, the excess power from the engine is sent to the generator motor unit for power generation.

[0037] C. Hybrid mode

[0038] c1. Extended range mode

[0039] The drive motor unit outputs power to the transmission module, which then outputs the power to the vehicle's wheels; at the same time, the engine outputs power to the generator motor unit for power generation;

[0040] c2, hybrid drive mode;

[0041] Ⅰ. Controlling the clutch module output terminal and the transmission module first connection terminal to be in a connection state through the control unit;

[0042] II. The engine outputs power, which is then passed through the clutch module and the transmission module to the vehicle's wheels. The drive motor unit outputs power to the transmission module, which then outputs power to the vehicle's wheels. At the same time, the engine's excess power is sent to the generator motor unit for power generation.

[0043] D. Kinetic energy recovery mode

[0044] The vehicle's wheels transmit power back to the drive motor unit through the gearbox module, which generates electricity through the drive motor unit to achieve kinetic energy recovery;

[0045] E. Parking charging mode

[0046] e1, Single motor parking power generation mode

[0047] The engine outputs power to the generator motor unit, which generates electricity through the generator motor unit, realizing single-motor parking power generation;

[0048] e2, dual-motor parking power generation mode

[0049] Ⅰ. Controlling the clutch module output terminal and the transmission module first connection terminal to be in a connection state through the control unit;

[0050] II. The vehicle engine outputs power to the drive motor unit and the generator motor unit respectively, and the drive motor unit and the generator motor unit generate electricity respectively, thereby realizing dual-motor parking power generation.

[0051] The beneficial effects of the present invention are:

[0052] 1. To address the complex structure of hybrid power systems, modular assembly can be achieved by using a parallel power source + overall series structure. The parallel power source design allows for integration between different mechanisms, primarily through the integrated design of the dual motors, which are integrated into one module. This not only reduces the number of parts but also the number of assembly steps. The overall series design makes the assembly process clear and easy to disassemble and maintain, primarily through the fact that the drive system can be divided into three modules: the clutch module, the electric drive module, and the transmission module. During assembly, the clutch module and the electric drive module can be assembled separately first, and then assembled with the transmission module. Different modules can be assembled in different locations, greatly improving assembly efficiency and reducing assembly costs. The modular assembly model makes the structural design and motor layout more reasonable, avoiding the problem of insufficient installation space in the vehicle, and also making the overall structure of the drive system simpler and less expensive.

[0053] 2. The power input or output of each motor adopts a single-stage gear set. Compared with the planetary gear structure, it can not only reduce the number of parts but also reduce the space size. The clutch connecting shaft and the gearbox connecting shaft are collinear, and the drive gear and the gearbox gear, the generator gear and the clutch gear are directly engaged, which simplifies the structure of the drive system, has a simple structure and low cost.

[0054] 3. The present invention includes three modes: pure electric drive, engine direct drive and hybrid drive, and also has a kinetic energy recovery function. In pure electric mode, through the dual-motor structure, it can realize single-motor drive alone or dual-motor drive at the same time, which can meet the use of various working conditions, such as starting, heavy load and other working conditions. In the engine direct drive mode, the engine power is directly transmitted to the gearbox module, and the power can also be transmitted to the generator motor for power generation, which is suitable for high-speed and other working conditions. The hybrid power mode mainly includes extended-range mode and hybrid drive mode. In the extended-range mode, the vehicle power is provided by the motor, and the engine is only used to generate electricity, which can keep the engine running in the high-efficiency range at all times, and is suitable for medium and low-speed working conditions; the hybrid drive mode is driven by the engine and the motor at the same time, and the engine directly participates in the drive, which can provide greater power to meet the working conditions of climbing, heavy load and other conditions. Under working conditions such as downhill and braking, the drive system can start the kinetic energy recovery mode, the drive motor can work quickly, and the power is directly transmitted to the drive motor through the mechanical gearbox input shaft, which can greatly improve the efficiency of kinetic energy recovery and save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic structural diagram of a parallel dual-motor hybrid drive system embodiment of the present invention;

[0056] Figure 2This is a schematic diagram of the engine power transmission route in an embodiment of the present invention;

[0057] Figure 3 This is a schematic diagram of the power transmission route of the drive motor in an embodiment of the present invention;

[0058] Figure 4 This is a schematic diagram of the power transmission route of the dual-motor drive mode in an embodiment of the present invention;

[0059] Figure 5 Schematic diagram of the power transmission route of the engine direct drive mode in an embodiment of the present invention;

[0060] Figure 6 This is a schematic diagram of the power transmission route in the extended range mode according to an embodiment of the present invention;

[0061] Figure 7 This is a schematic diagram of a power transmission route in a hybrid driving mode according to an embodiment of the present invention;

[0062] Figure 8 Schematic diagram of the power transmission route in the kinetic energy recovery mode according to an embodiment of the present invention;

[0063] Figure 9 This is a schematic diagram of the power transmission route in the single-motor parking power generation mode according to an embodiment of the present invention;

[0064] Figure 10 Schematic diagram of the power transmission route in the dual-motor parking power generation mode according to an embodiment of the present invention;

[0065] Figure 11 It is a functional mode schematic diagram of a parallel dual-motor hybrid driving method of the present invention.

[0066] Figures 2 to 10 The direction indicated by the arrow is the direction of power transmission.

[0067] In the picture:

[0068] 1-clutch module, 11-clutch body, 12-clutch connecting shaft, 13-clutch gear;

[0069] 2-electric drive module, 21-drive motor, 22-drive gear, 23-generator motor, 24-generator gear, 25-shift mechanism;

[0070] 3-transmission module, 31-transmission gear, 32-transmission connecting shaft, 33-transmission gear set. DETAILED DESCRIPTION

[0071] To further clarify the objectives, advantages, and features of the present invention, the following detailed description of a parallel dual-motor hybrid drive system and method proposed by the present invention is provided in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent through the following detailed description. It should be noted that the accompanying drawings are highly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the objectives of the embodiments of the present invention. Furthermore, the structures shown in the accompanying drawings are often portions of the actual structures.

[0072] Reference Figure 1 The present invention provides a parallel dual-motor hybrid drive system, which is composed of three modules connected in series, including a clutch module 1, an electric drive module 2 and a gearbox module 3.

[0073] The clutch module 1 includes a clutch body 11 , a clutch connecting shaft 12 and a clutch gear 13 .

[0074] The electric drive module 2 includes a generator motor 23 , a generator gear 24 , a shift mechanism 25 , a drive motor 21 , and a drive gear 22 .

[0075] The transmission module 3 includes a transmission gear 31 , a transmission connecting shaft 32 and a transmission gear set 33 .

[0076] The clutch module 1 mainly controls the power input and connection of the vehicle's engine (not shown in the figure). The clutch module 1 can be a wet clutch, but is not limited to a wet clutch. The clutch module 1 connects the engine and the electric drive module. The engine power intervenes, and the drive motor 21 provides power to realize hybrid drive.

[0077] The clutch connecting shaft 12 is a long shaft supported by bearings and passes through the housing of the electric drive module 2. Splines are processed at both ends. One end is connected to the clutch body 11, and the power is connected between the engine and the generator motor 23, the transmission module 3 and other components through the spline connection; one end is connected to the clutch gear 13, and the clutch gear 13 is engaged with the generator gear 24 to achieve single-stage speed change. A shift mechanism 25 is equipped with a meshing spline on one end of the generator gear 24, and the shift mechanism 25 is used to transmit the power on the clutch connecting shaft 12 to the transmission connecting shaft 32.

[0078] The shift mechanism 25 realizes the disconnection and connection between the clutch connecting shaft 12 and the transmission connecting shaft 32 through the engagement between the splines. It can be an electric shift mechanism 25 or a pneumatic shift mechanism 25, and shifting is achieved by controlling the lateral movement of the shift sleeve in the shift mechanism 25.

[0079] Specifically, the shift mechanism 25 includes a shift lever (not shown in the figure) and a shift sleeve; the shift sleeve is mounted on the meshing splines of the transmission gear 31 or the meshing splines of the clutch gear 13; the shift lever is connected to the outer wall of the shift sleeve and is used to shift the shift sleeve so that the shift sleeve is located on the meshing splines of the transmission gear 31 or the meshing splines of the clutch gear 13, thereby putting the transmission gear 31 and the clutch gear 13 in a disconnected state; or so that the two ends of the shift sleeve are respectively meshed with the meshing splines of the transmission gear 31 and the meshing splines of the clutch gear 13, thereby putting the transmission gear 31 and the clutch gear 13 in a connected state.

[0080] The core components of the electric drive module 2 are the drive motor 21 and the generator motor 23. These two motors can share a housing, but are not limited to sharing a housing. Both the drive motor 21 and the generator motor 23 can switch between driving and generating electricity. Their outputs can be arranged in either the same or opposite directions. The drive shafts of the drive motor 21 and the generator motor 23 can be arranged horizontally or at a specific angle relative to the clutch body 11, depending on the space available for the drive system on the vehicle. Gears are connected to the drive shafts of both the drive motor 21 and the generator motor 23. The drive gear 22 on the drive shaft of the drive motor 21 is constantly meshed with the transmission gear 31 on the transmission connecting shaft 32, providing pure electric power to the transmission gear set 33. The generator gear 24 on the drive shaft of the generator motor 23 is constantly meshed with the clutch gear 13 on the clutch connecting shaft 12, enabling power transfer between the clutch connecting shaft 12 and the generator motor 23.

[0081] One end of the transmission connecting shaft 32 has a transmission gear 31 that constantly meshes with the drive gear 22. This gear can be a shaft gear or a single gear, integrated with the transmission connecting shaft 32. The other end has a gear that constantly meshes with the transmission gear set 33. This gear can be a shaft gear or a single gear, integrated with the transmission connecting shaft 32, and also has meshing splines for transmission shifting. The transmission connecting shaft 32 enables power input and output to the transmission module 3. The transmission connecting shaft 32 connects the electric drive module 2 and the transmission module 3 and is supported by bearings.

[0082] The transmission gear set 33 is a double intermediate shaft structure with four gears, which expands the torque output range of the engine while ensuring that the engine is in the high-efficiency range.

[0083] See also Figure 11 The drive system of this embodiment can provide multiple functional modes:

[0084] like Figure 3 As shown, taking the first gear of the transmission gear set 33 as an example, a single-motor drive mode in pure electric mode is provided:

[0085] Power is transmitted from the drive shaft of drive motor 21 to drive gear 22, which then transmits it to transmission connecting shaft 32. Transmission connecting shaft 32 then transmits the power to transmission gear set 33. Taking first gear as an example, power is distributed via the dual intermediate shafts and then transmitted to the output shaft of transmission gear set 33, which then transmits the power to the wheels. This single-motor, pure electric drive mode offers high transmission efficiency and is suitable for driving conditions such as starting.

[0086] like Figure 4 As shown, taking the first gear of the transmission gear set 33 as an example, a dual-motor pure electric drive mode is provided:

[0087] At this time, the shift sleeve of the shift mechanism 25 is engaged with the meshing splines on the clutch gear 13 and the meshing splines on the transmission gear 31 at the same time.

[0088] The power of the drive motor 21 is transmitted to the wheels through the drive motor 21 drive shaft, drive gear 22, transmission connecting shaft 32, transmission gear set 33, and output shaft. The power of the generator motor 23 is transmitted through the generator motor 23 drive shaft, generator gear 24, clutch connecting shaft 12, shift mechanism 25, transmission connecting shaft 32, transmission gear set 33, and output shaft. A rational control algorithm enables simultaneous operation of the drive motor 21 and generator motor 23 in pure electric mode, making it suitable for heavy-load starting and other operating conditions.

[0089] like Figure 5 As shown, taking the first gear of the transmission gear set 33 as an example, an engine direct drive mode is provided:

[0090] At this time, the shift sleeve of the shift mechanism 25 is engaged with the meshing splines on the clutch gear 13 and the meshing splines on the transmission gear 31 at the same time.

[0091] At this time, the drive motor 21 is not working, and the engine power is transmitted from the clutch-clutch connecting shaft 12-meshing splines on the clutch gear 13-shift mechanism 25-transmission connecting shaft 32-transmission gear set 33-output shaft; at the same time, the excess power of the engine can be transmitted to the generator motor 23 through the clutch-clutch connecting shaft 12-clutch gear 13-generator gear 24-generator motor 23 drive shaft to realize power generation, which is suitable for high-speed working conditions.

[0092] like Figure 6 As shown, taking the first gear of the transmission gear set 33 as an example, the system can realize the extended range mode in the hybrid mode:

[0093] It has two power transmission routes. One is the driving power transmission route, in which power is provided by the drive motor 21, and is transmitted from the drive motor 21 drive shaft-drive gear 22-transmission connecting shaft 32-transmission gear set 33-output shaft to the wheel end. The other is the power generation power transmission route, in which power is provided by the engine, and is transmitted to the generator motor 23 through the clutch body 11-clutch connecting shaft 12-clutch gear 13-generator gear 24-generator motor 23 drive shaft to achieve power generation. In this mode, the engine can maintain a high efficiency range throughout the entire process, and all power is used for power generation. This mode is suitable for high-speed and other working conditions.

[0094] like Figure 7 As shown, taking the first gear of the transmission gear set 33 as an example, the system can realize the hybrid driving mode in the hybrid mode:

[0095] Its power is provided simultaneously by the engine and the drive motor 21, with three power transmission routes. The engine's power transmission route is: clutch body 11 - clutch connecting shaft 12 - meshing splines on clutch gear 13 - shift mechanism 25 - transmission connecting shaft 32 - transmission gear set 33 - output shaft; the drive motor 21's power transmission route is: drive motor 21 drive shaft - drive gear 22 - transmission connecting shaft 32 - transmission gear set 33 - output shaft; the power of the three is combined at the transmission connecting shaft 32 to achieve high-power drive. At the same time, the engine's additional power can be transmitted to the generator motor 23 via the clutch body 11 - clutch connecting shaft 12 - clutch gear 13 - generator gear 24 - generator motor 23 drive shaft to achieve power generation. This mode is suitable for working conditions such as heavy-load climbing.

[0096] like Figure 8 As shown, taking the fourth gear of the transmission gear set 33 as an example, the system can provide a kinetic energy recovery mode:

[0097] Kinetic energy is recovered, and its power passes through the output shaft-transmission gear set 33-transmission connecting shaft 32-drive gear 22-drive motor 21 drive shaft to realize the power generation function of the drive motor 21, which is suitable for high-speed braking, downhill braking and other working conditions.

[0098] like Figure 9 As shown, the single motor parking power generation mode in parking charging mode can be realized:

[0099] Power is provided by the engine and transmitted to the generator motor 23 through the clutch body 11, clutch connecting shaft 12, clutch gear 13, generator gear 24, and generator motor 23 drive shaft to generate electricity. In this mode, the engine can always operate in the high-efficiency range, with high efficiency, suitable for conditions such as short-term power replenishment.

[0100] like Figure 10As shown, the dual-motor parking power generation mode in the parking charging mode can be realized:

[0101] Power is provided by the engine. One path is transmitted to generator motor 23 via clutch body 11, clutch connecting shaft 12, clutch gear 13, generator gear 24, and the drive shaft of generator motor 23. Another path is transmitted to drive motor 21 via clutch body 11, clutch connecting shaft 12, meshing splines on clutch gear 13, shift mechanism 25, transmission connecting gear, drive gear 22, and the drive shaft of drive motor 21, achieving high-power power generation. This mode is suitable for rapid power replenishment.

Claims

1. A parallel dual-motor hybrid drive system, characterized by: It comprises a clutch module (1), an electric drive module (2) and a gearbox module (3) which are sequentially connected in series; The input end of the clutch module (1) is connected to the power output end of the vehicle engine; The electric drive module (2) comprises a drive motor unit, a generator motor unit and a control unit; The output end of the drive motor unit is connected to the first connection end of the gearbox module (3), and is used to provide pure electric power to the gearbox module (3), and to generate electricity through the power transmitted back from the gearbox module (3) in a power recovery mode; The connection end of the generator motor unit is connected to the output end of the clutch module (1) and is used to generate electricity through the power output from the output end of the clutch module (1). When operating in a dual-motor drive mode, the generator motor unit and the drive motor unit jointly provide power for the gearbox module (3). The control unit is used to control the connection or disconnection between the output end of the clutch module (1) and the first connection end of the transmission module (3), thereby controlling the on-off of the power transmission path between the vehicle engine and the generator motor unit and the transmission module (3); The second connection end of the transmission module (3) is connected to the wheel end of the vehicle.

2. The parallel dual-motor hybrid drive system according to claim 1, characterized in that: The driving motor unit includes a driving motor (21) and a driving gear (22); the generator motor unit includes a generator motor (23) and a generator gear (24); and the control unit is a shift mechanism (25). The transmission module (3) comprises a transmission gear (31) and a transmission gear set (33) connected to the transmission gear (31) via a transmission connecting shaft (32); the transmission gear (31) is a first connection end of the transmission module (3), and the transmission gear set (33) is a second connection end of the transmission module (3); The clutch module (1) comprises a clutch body (11), a clutch connecting shaft (12) and a clutch gear (13); the clutch body (11) is sleeved on one end of the clutch connecting shaft (12), and the clutch gear (13) is mounted on the other end of the clutch connecting shaft (12); one end of the clutch connecting shaft (12) is connected to the power output end of the vehicle engine; The driving gear (22) is mounted on the driving shaft of the driving motor (21) and meshes with the gearbox gear (31); The power generation gear (24) is mounted on the drive shaft of the power generation motor (23) and meshes with the clutch gear (13); The shift mechanism (25) is used to control the connection or disconnection between the transmission gear (31) and the clutch gear (13).

3. The parallel dual-motor hybrid drive system according to claim 2, characterized in that: The clutch connecting shaft (12) and the transmission connecting shaft (32) are coaxially arranged, and the driving motor (21) and the generator motor (23) are respectively arranged on both sides of the clutch connecting shaft (12).

4. A parallel dual-motor hybrid drive system according to claim 2 or 3, characterized in that: The shift mechanism (25) includes a shift sleeve; The shift sleeve is mounted on the meshing spline of the transmission gear (31) or the meshing spline of the clutch gear (13); The outer wall of the shift sleeve is connected to an external shift lever, and is used to shift the shift sleeve laterally by the shift lever, so that the shift sleeve is located on the meshing spline of the transmission gear (31) or the meshing spline of the clutch gear (13), thereby putting the transmission gear (31) and the clutch gear (13) in a disconnected state; or so that the two ends of the shift sleeve are respectively meshed with the meshing spline of the transmission gear (31) and the meshing spline of the clutch gear (13), thereby putting the transmission gear (31) and the clutch gear (13) in a connected state.

5. The parallel dual-motor hybrid drive system according to claim 4, characterized in that: The transmission gear set (33) is a double intermediate shaft structure and is a four-speed transmission gear set.

6. A driving method of a parallel dual-motor hybrid powertrain, based on a parallel dual-motor hybrid powertrain system according to any one of claims 1 to 5, characterized in that: include: A. Pure electric mode a1. Single motor drive mode The driving motor unit outputs power to the gearbox module (3), and the gearbox module (3) then outputs the power to the wheel end of the vehicle; a2. Dual motor drive mode Ⅰ. Controlling the clutch module (1) output end and the transmission module (3) first connection end to be in a connection state through the control unit; II. The driving motor unit and the generator motor unit respectively output power to the transmission module (3), and the transmission module (3) then outputs the power to the wheel end of the vehicle; B. Engine direct drive mode; Ⅰ. Controlling the clutch module (1) output end and the transmission module (3) first connection end to be in a connection state through the control unit; II. The vehicle engine outputs power, which is then sequentially transmitted through the clutch module (1) and the transmission module (3) to the vehicle's wheels; at the same time, the excess power of the engine is output to the generator motor unit for power generation; C. Hybrid mode c1. Extended range mode The driving motor unit outputs power to the gearbox module (3), which then outputs the power to the wheel end of the vehicle; at the same time, the engine outputs power to the generator motor unit to generate electricity; c2, hybrid drive mode; Ⅰ. Controlling the clutch module (1) output end and the transmission module (3) first connection end to be in a connection state through the control unit; II. The power is outputted by the engine, and then sequentially passes through the clutch module (1) and the transmission module (3) to the wheel end of the vehicle; The driving motor unit outputs power to the transmission module (3), which then outputs the power to the wheel end of the vehicle; at the same time, the excess power of the engine is output to the generator motor unit for power generation; D. Kinetic energy recovery mode The wheel end of the vehicle transmits power back to the drive motor unit through the gearbox module (3), and the drive motor unit generates electricity to achieve kinetic energy recovery; E. Parking charging mode e1, Single motor parking power generation mode The engine outputs power to the generator motor unit, which generates electricity through the generator motor unit, realizing single-motor parking power generation; e2, dual-motor parking power generation mode Ⅰ. Controlling the clutch module (1) output end and the transmission module (3) first connection end to be in a connection state through the control unit; II. The vehicle engine outputs power to the drive motor unit and the generator motor unit respectively, and the drive motor unit and the generator motor unit generate electricity respectively, thereby realizing dual-motor parking power generation.

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