Single-motor hybrid power gearbox and control mode thereof

Abstract

The invention belongs to the technical field of hybrid power gearboxes, and relates to a single-motor hybrid power gearbox and a control method thereof, the single-motor hybrid power gearbox comprises two power sources, namely an engine and a driving motor, which are coaxially arranged, and further comprises a gear transmission system consisting of a planet row, two brakes, an electromagnetic clutch, an output shaft and a differential mechanism. A planet carrier in the planet row is connected with an engine through an input shaft, a sun gear is connected with a rotor shaft spline of a driving motor, and the engine drives a transmission gear, an output shaft and a differential mechanism to jointly form a single-motor hybrid power driving system. On one hand, the functions of pure electric driving of the driving motor, power generation of the driving motor driven by the engine and multi-gear driving of the engine can be achieved by controlling the planet row through the electric control braking system, and on the other hand, compared with a traditional dual-motor hybrid power transmission scheme, a single-motor hybrid power scheme with complete functions is adopted. And the production cost of the transmission can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid power transmissions, and in particular to a single-motor hybrid power transmission and a control method thereof. Background Art

[0002] At present, with the rapid growth of the global automobile ownership, the pressure on energy, environment, safety and other aspects is increasing, and the global automobile energy conservation and electrification process is accelerating. Faced with the industry bottlenecks such as the range anxiety of pure electric vehicles, the imperfect construction of charging infrastructure, and the difficulty of achieving major technological breakthroughs in power batteries in the short and medium term, pure electric vehicles are currently unable to meet the current market demand for automobile use. Conventional hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV) can not only meet the current domestic and foreign emission energy conservation target needs, but also meet the current market conditions, and have been widely promoted and applied worldwide. For the currently exported non-plug-in hybrid (HEV) vehicles, this type of vehicle is mainly driven by the engine, and the motor exists as an auxiliary drive power. The foreign structure of adding an auxiliary drive motor based on the automatic transmission can well meet this demand. Although the domestic dual-motor hybrid route is not worse than the foreign route in terms of vehicle performance, the dual motor and electronic control have higher costs and certain design redundancy, while the single motor can better meet the needs of non-plug-in hybrid (HEV) vehicles.

[0003] In order to solve the above problems, remove redundant and costly drive motors, and build a single-motor and single-electronic-controlled hybrid powertrain. This application proposes a single-motor hybrid transmission and a control method thereof. Summary of the invention

[0004] 1. Purpose of the invention In order to solve the technical problems existing in the background technology, the present invention proposes a single-motor hybrid power transmission and a control method thereof.

[0005] (II) Technical solution To solve the above problems, the present invention provides a single-motor hybrid power transmission, comprising two power sources, an engine and a drive motor, which are coaxially arranged, and is characterized in that the engine and the drive motor are commonly connected to the two power sources, and a planetary gear transmission system for transmitting power is installed on the two power sources, and the planetary gear transmission system includes an input shaft coaxially arranged with the engine and the drive motor, and is composed of a planetary gear, two electronically controlled brakes and an electromagnetic clutch, and the planetary gear is composed of an outer ring gear, a planet carrier and a sun gear.

[0006] Furthermore, the two electronically controlled brakes include a planetary carrier brake, a sun gear brake, an outer gear ring and an inner gear, the planetary carrier brake is composed of a planetary carrier brake outer hub, a planetary carrier brake inner hub and a friction element, the planetary carrier brake outer hub is fixed on the transmission housing, the planetary carrier brake inner hub is fixedly connected to the planetary carrier by bolts, the sun gear brake is composed of a sun gear brake outer hub, a sun gear brake inner hub and a friction element, the sun gear brake outer hub is fixedly mounted on the transmission housing, the sun gear brake inner hub is fixedly connected to the sun gear, and the planetary carrier is connected to the input shaft.

[0007] Furthermore, a shock absorber is installed on the engine, the input shaft is fixedly connected to the shock absorber spline on the engine, the drive motor rotor shaft is installed on the sun gear, the electromagnetic clutch is used to connect and separate the outer gear ring and the input shaft, the outer gear ring is installed with an engine drive driving gear, an output shaft and an engine drive driven gear, and the engine drive driving gear, the output shaft and the engine drive driven gear are meshed, a differential is installed at a position on one side of the output shaft, a main reduction driven gear is installed on the differential, a main reduction driving gear is installed on the output shaft, and the main reduction driving gear is meshed with the main reduction driven gear on the differential.

[0008] Furthermore, the electromagnetic clutch, the planetary carrier brake and the sun gear brake in the planetary gear transmission system are controlled by circuit opening and closing to realize the conversion of the two power transmission paths of the engine and the drive motor and the switching of the drive gear, thereby realizing different transmission system operations.

[0009] Furthermore, the transmission system includes an engine-driven drive motor power generation system, a drive motor pure electric drive system and an engine multi-speed drive system.

[0010] Furthermore, the engine driven motor power generation system is constructed such that when the electromagnetic clutch is open and the planetary carrier brake and the sun gear brake are both open, the power of the engine drives the motor to generate electricity through the shock absorber, input shaft, planetary carrier, planetary gear, sun gear, and motor rotor shaft.

[0011] Furthermore, the pure electric drive system of the drive motor is constructed as follows: the electromagnetic clutch is opened, the planetary carrier brake is closed, and the sun gear brake is opened, and the power of the drive motor is output to the differential through the motor rotor shaft, sun gear, planetary gear, outer ring gear, engine drive gear, engine drive driven gear, output shaft, main reduction driving gear, and main reduction driven gear.

[0012] Further, the engine multi-speed drive system includes an engine low-speed gear drive system, the engine low-speed gear drive system is composed of a closed electromagnetic clutch assembly, a planetary carrier brake and a sun gear brake in an open state, and the power of the engine is output to the differential through the shock absorber, the input shaft, the electromagnetic clutch, the outer gear ring, the engine drive driving gear, the engine drive driven gear, the output shaft, the main reduction driving gear, and the main reduction driven gear to drive the vehicle. At this time, the engine drive speed ratio is close to the engine low-speed gear drive speed ratio, and the drive motor can participate in driving, generating electricity or idling depending on the battery power or the vehicle driving conditions to ensure efficient driving of the engine. The engine multi-speed drive system includes an engine high-speed gear drive system, the engine high-speed gear drive system is composed of an electromagnetic clutch assembly, an open planetary carrier brake, and a closed sun gear brake, and the power of the engine is output to the differential through the shock absorber, the input shaft, the planetary carrier, the outer gear ring, the engine drive driving gear, the engine drive driven gear, the output shaft, the main reduction driving gear, and the main reduction driven gear. At this time, the engine drive speed ratio is close to the engine high-speed gear drive speed ratio.

[0013] Furthermore, the engine multi-speed drive system includes a power split drive system. The power split drive system is configured such that when the battery power is low under the pure electric drive condition of the drive motor, the planetary carrier brake is opened, the engine is driven to rotate and the engine is started by adjusting the speed of the drive motor, the drive motor is switched to the power generation state, and the power split drive condition is entered. After the engine power passes through the shock absorber, the input shaft, and the planetary carrier, part of the power passes through the planetary gears, the sun gear, and the motor rotor shaft to drive the drive motor to forward and generate electricity, and part of the power passes through the planetary gears, the outer ring gear, the engine drive driving gear, the engine drive driven gear, the output shaft, and the main reduction driving gear. , main reduction driven gear, and differential are used for driving. Due to the power splitting condition, the drive motor is always in the power generation state, and the generated electricity can only be stored in the vehicle battery pack. When the battery power of the vehicle reaches a certain value or is fully charged, it is necessary to leave this condition and determine the subsequent driving mode according to the driving condition of the vehicle, or enter the pure electric drive condition, or enter the engine multi-speed drive condition. The engine multi-speed drive system includes an engine overspeed drive system. The engine overspeed drive system is actually another drive form of power splitting. Under this drive condition, the drive motor is in the reverse drive state, and the engine and the drive motor are driven together to form an engine overspeed drive system. Due to the engine overspeed drive condition, the drive motor is always in the power consumption state. When the battery power of the vehicle is less than a certain value, it is necessary to leave this condition, close the sun gear brake, and enter the engine high-speed drive condition.

[0014] A control method for a single-motor hybrid power transmission, the method being adopted in a single-motor hybrid power transmission as described in any one of the above, comprising: When parking power generation is required: When the vehicle is stopped and the battery is low, the engine needs to drive the drive motor to generate power to charge the vehicle battery; the electromagnetic clutch, planetary carrier brake, and sun gear brake are all open; in this condition, only the drive motor, sun gear, input shaft, and planetary carrier are involved in the work; When pure electric drive is required: the electromagnetic clutch is open, the planetary carrier brake is closed, the sun gear brake is open, the engine is not working, the drive motor is reversed, and the driving force of the motor drives the vehicle through the motor rotor shaft, sun gear, planetary carrier, outer gear ring, output shaft, and differential. The drive motor consumes the power in the battery during pure electric drive. There is no other way to replenish the battery in this working condition, and it can only be used when the battery is fully charged; When braking energy recovery is required: The braking energy recovery during vehicle driving is implemented by converting the driving motor into a power generation state; When the engine needs to be driven in low gear: the electromagnetic clutch is closed, the planetary carrier brake and the sun gear brake are in the open state, the planetary carrier and the outer gear ring are connected together, and the power of the engine drives the planetary row and the drive motor to rotate synchronously through the shock absorber, input shaft, outer gear ring, planetary carrier, sun gear, and motor rotor shaft; the drive motor can participate in driving, generating electricity or idling according to the battery power or vehicle driving conditions to ensure efficient engine driving; at this time, the engine drive speed ratio is close to the engine low gear drive speed ratio; When the engine needs to be driven in high gear: the electromagnetic clutch is opened, the planetary carrier brake is opened, the sun gear brake is closed, the drive motor is in a non-working state, and the engine power passes through the shock absorber, input shaft, planetary carrier, outer gear ring, output shaft, and differential, and the engine drive speed ratio is close to the high gear drive speed ratio; When power split drive is required: When the battery power is low in the pure electric drive condition of the drive motor, open the planetary carrier brake, adjust the speed of the drive motor to drive the engine to rotate and start the engine, and the drive motor switches to the power generation state, entering the power split drive condition. Part of the engine power is used to drive the drive motor to forward and generate electricity, and part of the power is used to drive the engine, forming a power split drive system. In the power split condition, the drive motor is always in the power generation state, and the generated electricity can only be stored in the vehicle battery pack. When the battery pack of the vehicle reaches a certain value or is fully charged, it is necessary to leave this condition and determine the subsequent driving mode according to the driving condition of the vehicle, or enter the pure electric drive condition, or enter the engine multi-speed drive condition; Engine overspeed drive: The electromagnetic clutch is open, the planetary carrier brake and the sun gear brake are both open, the drive motor is in the reverse drive state, and the engine and the drive motor are driven together to form an engine overspeed drive system.

[0015] The above technical solution of the present invention has the following beneficial technical effects: On the one hand, the present invention can connect the engine input shaft and the generator and drive motor shaft through a planetary gear row to achieve working conditions under different speed ratios. On the same design platform, three hybrid power transmission products with different functions, namely engine three-speed drive, engine single-speed drive, and drive motor pure electric drive, can be realized. The components are shared to the maximum extent, and the simplest assembly and component structure can reduce production costs. On the other hand, the integrated motor drive unit, transmission control unit, and hybrid system control unit are coordinated and controlled to realize functions such as engine start and stop, parking power generation, pure electric drive, engine multi-speed direct drive, energy recovery, and power diversion, ultimately achieving improved vehicle fuel economy and meeting emission regulations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of a single-motor hybrid power transmission and its control method in an embodiment of the present invention.

[0017] In the figure: 1. Shock absorber; 2. Electromagnetic clutch; 3. Input shaft; 4. Outer gear ring; 5. Planet carrier brake; 6. Sun gear brake; 7. Motor rotor shaft; 8. Sun gear; 9. Planetary gear; 10. Planet carrier; 11. Output shaft; 12. Inner gear of outer gear ring; 13. Engine drive driving gear; 14. Engine drive driven gear; 15. Main reduction driving gear; 16. Main reduction driven gear; 17. Differential; 18. Sun gear brake inner hub; 19. Sun gear brake outer hub; 20. Planet carrier brake inner hub; 21. Planet carrier brake outer hub; 100. Engine; 200. Drive motor; 300. Planetary gear. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0019] like Figure 1 The present invention provides a single-motor hybrid transmission and a control method thereof, comprising two power sources, a coaxially arranged engine 100 and a drive motor 200, and is characterized in that the engine 100 and the drive motor 200 are commonly connected to the two power sources, and a planetary gear transmission system for power transmission is installed on the two power sources, the planetary gear transmission system comprises an input shaft 3 coaxially arranged with the engine 100 and the drive motor 200, and is composed of a planetary gear 300, two electronically controlled brakes and an electromagnetic clutch 2, and the planetary gear 300 is composed of an outer ring gear 4, a planet carrier 10 and a sun gear 8.

[0020] The two electronically controlled brakes include a planetary carrier brake 5, a sun gear brake 6, and an outer ring gear inner gear 12. The planetary carrier brake 5 is composed of a planetary carrier brake outer hub 21, a planetary carrier brake inner hub 20 and a friction element. The planetary carrier brake outer hub 21 is fixed to the transmission housing, and the planetary carrier brake inner hub 20 is fixedly connected to the planetary carrier 10 by bolts. The sun gear brake 6 is composed of a sun gear brake outer hub 19, a sun gear brake inner hub 18 and a friction element. The sun gear brake outer hub 19 is fixedly mounted on the transmission housing, the sun gear brake inner hub 18 is fixedly connected to the sun gear 8, and the planetary carrier 10 is connected to the input shaft 3.

[0021] The engine 100 is equipped with a shock absorber 1, the input shaft 3 is spline-fixedly connected to the shock absorber 1 on the engine 100, the sun gear 8 is equipped with a drive motor rotor shaft 7, the electromagnetic clutch 2 is used to connect and separate the outer gear ring 4 and the input shaft 3, the outer gear ring 4 is equipped with an engine drive driving gear 13, an output shaft 11 and an engine drive driven gear 14, and the engine drive driving gear 13, the output shaft 11 and the engine drive driven gear 14 are meshed, a differential 17 is installed at a position on one side of the output shaft 11, a main reduction driven gear 16 is installed on the differential 17, a main reduction driving gear 15 is installed on the output shaft 11, and the main reduction driving gear 15 is meshed with the main reduction driven gear 16 on the differential 17.

[0022] The electromagnetic clutch 2, the planetary carrier brake 5 and the sun gear brake 6 in the planetary gear transmission system realize the conversion of the two power transmission paths of the engine 100 and the drive motor 200 and the switching of the drive gear through circuit opening and closing control, thereby realizing different transmission system operations.

[0023] The transmission system includes an engine-driven drive motor power generation system, a drive motor pure electric drive system and an engine multi-speed drive system.

[0024] The engine driven motor power generation system is constructed such that when the electromagnetic clutch 2 is open and the planetary carrier brake 5 and the sun gear brake 6 are both open, the power of the engine 100 drives the drive motor 200 to generate electricity through the shock absorber 1, the input shaft 3, the planetary carrier 10, the planetary gear 9, the sun gear 8, and the motor rotor shaft 7.

[0025] The pure electric drive system of the drive motor is constructed as follows: the electromagnetic clutch 2 is opened, the planetary carrier brake 5 is closed, and the sun gear brake 6 is opened. The power of the drive motor 200 is output to the differential 17 through the motor rotor shaft 7, the sun gear 8, the planetary gear 9, the outer ring gear 4, the engine drive driving gear 13, the engine drive driven gear 14, the output shaft 11, the main reduction driving gear 15, and the main reduction driven gear 16.

[0026] The engine multi-speed drive system includes an engine low-speed gear drive system. The engine low-speed gear drive system is composed of the electromagnetic clutch 2 assembly closed, the planetary carrier brake 5 and the sun gear brake 6 are in the open state, and the power of the engine 100 is output to the differential 17 through the shock absorber 1, the input shaft 3, the electromagnetic clutch 2, the outer ring gear 4, the engine drive driving gear 13, the engine drive driven gear 14, the output shaft 11, the main reduction driving gear 15, and the main reduction driven gear 16 to drive the vehicle to travel. At this time, the engine drive speed ratio is close to the engine low-speed gear drive speed ratio, and the drive motor 200 can be driven according to the battery power. Or the vehicle driving conditions participate in driving, power generation or idling to ensure efficient driving of the engine. The engine multi-speed drive system includes an engine high-speed gear drive system. The engine high-speed gear drive system is composed of an electromagnetic clutch assembly 2, a planetary carrier brake 5 is opened, and a sun gear brake 6 is closed. The power of the engine 100 is output to the differential 17 through the shock absorber 1, the input shaft 3, the planetary carrier 10, the outer ring gear 4, the engine drive driving gear 13, the engine drive driven gear 14, the output shaft 11, the main reduction driving gear 15, and the main reduction driven gear 16. At this time, the engine drive speed ratio is close to the engine high-speed gear drive speed ratio.

[0027] The engine multi-speed drive system includes a power split drive system. The power split drive system is configured as follows: when the battery power is low under the pure electric drive condition of the drive motor, the planetary carrier brake 5 is opened, the engine is driven to rotate and the engine 100 is started by adjusting the speed of the drive motor 200, and the drive motor is switched to the power generation state to enter the power split drive condition. After the power of the engine 100 passes through the shock absorber 1, the input shaft 3, and the planetary carrier 10, part of the power passes through the planetary gear 9, the sun gear 8, and the motor rotor shaft 7 to drive the drive motor 200 to forwardly generate electricity, and part of the power passes through the planetary gear 9, the outer ring gear 4, the engine drive driving gear 13, the engine drive driven gear 14, the output shaft 11, the main reduction gear The driving gear 15, the main reduction driven gear 16, and the differential 17 are used for driving. Due to the power splitting condition, the driving motor 200 is always in the power generation state, and the generated electricity can only be stored in the vehicle battery pack. When the battery power of the vehicle reaches a certain value or is fully charged, it is necessary to leave this condition and determine the subsequent driving mode according to the vehicle driving condition, or enter the pure electric driving condition, or enter the engine multi-speed driving condition. The engine multi-speed driving system includes an engine overspeed driving system. The engine overspeed driving system is actually another driving form of power splitting. Under this driving condition, the driving motor 200 is in the reverse driving state, and the engine 100 and the driving motor 200 are driven together to form an engine overspeed driving system. Due to the engine overspeed driving condition, the driving motor 200 is always in the power consumption state. When the battery power of the vehicle is less than a certain value, it is necessary to leave this condition, close the sun gear brake 6, and enter the engine high-speed driving condition.

[0028] Working mode of a specific embodiment of the present invention.

[0029] This embodiment is a single motor hybrid + power transmission and its control method. Its working mode is as follows: Parking power generation: When the vehicle is stopped and the battery is low, the engine 100 is required to drive the drive motor 200 to generate electricity to charge the vehicle battery; the electromagnetic clutch 2, the planetary carrier brake 5, and the sun gear brake 6 are all open; in this condition, only the drive motor 200, the sun gear 8, the input shaft 3 and the planetary carrier 10 are involved in the work.

[0030] Pure electric drive: the electromagnetic clutch 2 is open, the planetary carrier brake 5 is closed, the sun gear brake 6 is open, and the engine 100 does not work. The drive motor 200 is driven in reverse, and the driving force of the motor drives the vehicle through the motor rotor shaft 7, the sun gear 8, the planetary carrier 10, the outer gear ring 4, the output shaft 11, and the differential 17. The drive motor consumes the power in the battery during pure electric drive. There is no other way to replenish the battery in this working condition, and it is only used when the battery is relatively sufficient.

[0031] Braking energy recovery: Braking energy recovery during vehicle driving is implemented by converting the driving motor 200 into a power generation state.

[0032] Engine low gear drive: electromagnetic clutch 2 is closed, planetary carrier brake 5 and sun gear brake 6 are in the open state, planetary carrier 10 and outer gear ring 4 are connected together, and the power of engine 100 drives planetary row 300 and drive motor 200 to rotate synchronously through shock absorber 1, input shaft 3, outer gear ring 4, planetary carrier 10, sun gear 8, motor rotor shaft 7; drive motor 200 can participate in driving, power generation or idling depending on the battery power status or vehicle driving conditions to ensure efficient driving of engine 100; at this time, the engine drive speed ratio is close to the engine low gear drive speed ratio.

[0033] Engine high gear drive: electromagnetic clutch 2 is open, planetary carrier brake 5 is open, sun gear brake 6 is closed, drive motor 200 is in non-working state, power of engine 100 passes through shock absorber 1, input shaft 3, planetary carrier 10, outer gear ring 4, output shaft 11, differential 17, and engine drive speed ratio is close to high gear drive speed ratio.

[0034] Power split drive: When the battery power is low in the pure electric drive condition of the drive motor, the planetary carrier brake 5 is opened, and the engine is driven to rotate and the engine 100 is started by adjusting the speed of the drive motor 200. The drive motor 200 is switched to the power generation state and enters the power split drive condition. Part of the power of the engine 100 is used to drive the drive motor 200 to generate power in the forward direction, and part of the power is used for driving, forming a power split drive system. Since the drive motor 200 is always in the power generation state in the power split condition, the generated electricity can only be stored in the vehicle battery pack. When the battery power of the vehicle reaches a certain value or is fully charged, it is necessary to leave this condition and determine the subsequent driving mode according to the driving condition of the vehicle, or enter the pure electric drive condition, or enter the engine multi-speed drive condition.

[0035] Engine overspeed drive: the electromagnetic clutch 2 is opened, the planetary carrier brake 5 and the sun gear brake 6 are opened, the drive motor 200 is in a reverse drive state, the engine 100 and the drive motor 200 are driven together to form an engine overspeed drive system.

Claims

1. A single-motor hybrid power transmission, comprising two power sources, an engine (100) and a drive motor (200) arranged coaxially, characterized in that: The engine (100) and the drive motor (200) are connected to two power sources, and the two power sources are equipped with a planetary gear transmission system for transmitting power. The planetary gear transmission system includes an input shaft (3) arranged coaxially with the engine (100) and the drive motor (200), and is composed of a planetary gear (300), two electronically controlled brakes and an electromagnetic clutch (2). The planetary gear (300) is composed of an outer ring gear (4), a planet carrier (10) and a sun gear (8).

2. A single-motor hybrid transmission according to claim 1, characterized in that: The two electrically controlled brakes comprise a planetary carrier brake (5), a sun gear brake (6), and an outer gear ring and an inner gear (12); the planetary carrier brake (5) comprises a planetary carrier brake outer hub (21), a planetary carrier brake inner hub (20), and a friction element; the planetary carrier brake outer hub (21) is fixed to a transmission housing; the planetary carrier brake inner hub (20) is fixedly connected to a planetary carrier (10) by bolts; the sun gear brake (6) comprises a sun gear brake outer hub (19), a sun gear brake inner hub (18), and a friction element; the sun gear brake outer hub (19) is fixedly mounted on the transmission housing; the sun gear brake inner hub (18) is fixedly connected to a sun gear (8); and the planetary carrier (10) is connected to an input shaft (3).

3. A single-motor hybrid transmission according to claim 2, characterized in that: The engine (100) is mounted with a shock absorber (1); the input shaft (3) is spline-fixedly connected to the shock absorber (1) on the engine (100); the sun gear (8) is mounted with a drive motor rotor shaft (7); the electromagnetic clutch (2) is used to connect and disconnect the outer gear ring (4) and the input shaft (3); the outer gear ring (4) is mounted with an engine drive driving gear (13), an output shaft (11) and an engine drive driven gear (14); the engine drive driving gear (13), the output shaft (11) and the engine drive driven gear (14) are meshed; a differential (17) is mounted on one side of the output shaft (11); a main reduction driven gear (16) is mounted on the differential (17); a main reduction driving gear (15) is mounted on the output shaft (11); and the main reduction driving gear (15) is meshed with the main reduction driven gear (16) on the differential (17).

4. A single-motor hybrid transmission according to claim 3, characterized in that: The electromagnetic clutch (2) and the planetary carrier brake (5) and the sun gear brake (6) in the planetary gear transmission system are controlled by circuit opening and closing to achieve the conversion of the two power transmission paths of the engine (100) and the drive motor (200) and the switching of the drive gear, thereby achieving different transmission system operations.

5. A single-motor hybrid transmission according to claim 4, characterized in that: The transmission system includes an engine-driven drive motor power generation system, a drive motor pure electric drive system and an engine multi-speed drive system.

6. A single-motor hybrid transmission according to claim 5, characterized in that: The engine-driven drive motor power generation system is configured such that when the electromagnetic clutch (2) is opened, the planetary carrier brake (5) and the sun gear brake (6) are both opened, the power of the engine (100) drives the drive motor (200) to generate electricity via the shock absorber (1), the input shaft (3), the planetary carrier (10), the planetary gear (9), the sun gear (8) and the motor rotor shaft (7).

7. The single-motor hybrid transmission according to claim 6, characterized in that: The pure electric drive system of the drive motor is configured as follows: the electromagnetic clutch (2) is opened, the planetary carrier brake (5) is closed, the sun gear brake (6) is opened, and the power of the drive motor (200) is output to the differential (17) through the motor rotor shaft (7), the sun gear (8), the planetary gear (9), the outer ring gear (4), the engine drive driving gear (13), the engine drive driven gear (14), the output shaft (11), the main reduction driving gear (15), and the main reduction driven gear (16).

8. The single-motor hybrid transmission according to claim 7, characterized in that: The engine multi-speed drive system comprises an engine low-speed gear drive system, wherein the electromagnetic clutch (2) assembly is closed, the planetary carrier brake (5) and the sun gear brake (6) are in an open state, and the power of the engine (100) is output to the differential (17) through the shock absorber (1), the input shaft (3), the electromagnetic clutch (2), the outer gear ring (4), the engine drive driving gear (13), the engine drive driven gear (14), the output shaft (11), the main reduction driving gear (15), and the main reduction driven gear (16) to drive the vehicle to travel. At this time, the engine drive speed ratio is close to the engine low-speed gear drive speed ratio, and the drive motor (200) can be adjusted according to the battery power. The engine multi-speed drive system participates in driving, generating electricity or idling according to the quantity conditions or vehicle driving conditions, thereby ensuring efficient driving of the engine. The engine multi-speed drive system comprises an engine high-speed gear drive system. The engine high-speed gear drive system is composed of an electromagnetic clutch assembly (2), an open planetary carrier brake (5), a closed sun gear brake (6), and the power of the engine (100) is output to the differential (17) through the shock absorber (1), the input shaft (3), the planetary carrier (10), the outer gear ring (4), the engine drive driving gear (13), the engine drive driven gear (14), the output shaft (11), the main reduction driving gear (15), and the main reduction driven gear (16). At this time, the engine drive speed ratio is close to the engine high-speed gear drive speed ratio.

9. The single-motor hybrid transmission according to claim 8, characterized in that: The engine multi-speed drive system comprises a power split drive system. The power split drive system is configured such that when the battery power is low in the pure electric drive condition of the drive motor, the planetary carrier brake (5) is opened, the engine is driven to rotate and the engine (100) is started by adjusting the speed of the drive motor (200), the drive motor is switched to a power generation state, and the power split drive condition is entered. After the power of the engine (100) passes through the shock absorber (1), the input shaft (3), and the planetary carrier (10), a part of the power passes through the planetary gear (9), the sun gear (8), and the motor rotor shaft (7) to drive the drive motor (200) to generate electricity in a forward direction, and a part of the power passes through the planetary gear (9), the outer gear ring (4), the engine drive driving gear (13), the engine drive driven gear (14), and the output The shaft (11), the main reduction driving gear (15), the main reduction driven gear (16), and the differential (17) are used for driving. Since the driving motor (200) is always in a power generation state in the power splitting condition, the generated power can only be stored in the vehicle battery pack. When the power of the vehicle battery pack reaches a certain value or is fully charged, it is necessary to leave this condition and determine the subsequent driving mode according to the vehicle driving condition, or enter the pure electric driving condition, or enter the engine multi-speed driving condition. The engine multi-speed driving system includes an engine overspeed driving system. The engine overspeed driving system is actually another driving form of power splitting. In this driving condition, the driving motor (200) is in a reverse driving state, and the engine (100) and the driving motor (200) are driven together to form an engine overspeed driving system. Since the driving motor (200) is always in a power consumption state in the engine overspeed driving condition, when the power of the vehicle battery pack is less than a certain value, it is necessary to leave this condition, close the sun gear brake (6), and enter the engine high-speed driving condition.

10. A control method for a single-motor hybrid transmission according to any one of claims 1 to 8, characterized in that: include: When parking power generation is required: when the vehicle is stopped and the battery is low on power, the engine (100) is required to drive the drive motor (200) to generate power to charge the vehicle battery; the electromagnetic clutch (2), the planetary carrier (10) brake (5), and the sun gear (8) brake (6) are all opened, and in this working condition, only the drive motor (200), the sun gear (8), the input shaft (3), and the planetary carrier (10) are involved in the work; When pure electric drive is required: the electromagnetic clutch (2) is opened, the brake (5) of the planetary carrier (10) is closed, the brake (6) of the sun gear (8) is opened, the engine (100) does not work, the drive motor (200) is driven in reverse, and the driving force of the motor drives the vehicle to travel through the motor rotor shaft (7), the sun gear (8), the planetary carrier (10), the outer ring gear (4), the output shaft (11), and the differential (17). When pure electric drive is used, the drive motor (200) consumes the power in the battery. In this working condition, the battery has no other means of replenishing power and is only used when the power is sufficient. When braking energy recovery is required: braking energy recovery during vehicle driving is implemented by converting the driving motor (200) into a power generation state; When the engine (100) needs to be driven at a low gear: the electromagnetic clutch (2) is closed, the brake (5) of the planetary carrier (10) and the brake (6) of the sun gear (8) are in an open state, the planetary carrier (10) and the outer gear ring (4) are connected together, and the power of the engine (100) drives the planetary row (300) and the drive motor (200) to rotate synchronously through the shock absorber (1), the input shaft (3), the outer gear ring (4), the planetary carrier (10), the sun gear (8), and the motor rotor shaft (7). The drive motor (200) can participate in driving, generating electricity, or idling according to the battery power status or the vehicle driving status, so as to ensure the efficient driving of the engine (100). At this time, the driving speed ratio of the engine (100) is close to the driving speed ratio of the engine (100) at a low gear; When the engine (100) needs to be driven in high gear: the electromagnetic clutch (2) is opened, the brake (5) of the planetary carrier (10) is opened, the brake (6) of the sun gear (8) is closed, the drive motor (200) is in a non-operating state, and the power of the engine (100) passes through the shock absorber (1), the input shaft (3), the planetary carrier (10), the outer ring gear (4), the output shaft (11), and the differential (17), and the drive speed ratio of the engine (100) is close to the high gear drive speed ratio; When power split drive is required: when the battery power is low in the pure electric drive condition of the drive motor (200), the brake (5) of the planetary carrier (10) is opened, and the engine (100) is driven to rotate and start working by adjusting the speed of the drive motor (200), and the drive motor (200) is switched to a power generation state, entering a power split drive condition, a part of the power of the engine (100) is used to drive the drive motor (200) to generate power in forward rotation, and a part of the power is used to drive the engine (100), forming a power split drive system. In the power split condition, the drive motor (200) is always in a power generation state, and the generated power can only be stored in the vehicle battery pack. When the battery power of the vehicle reaches a certain value or is fully charged, it is necessary to leave this condition, determine the subsequent driving mode according to the vehicle driving condition, or enter a pure electric drive condition, or enter a multi-speed drive condition of the engine (100); The engine (100) overspeed gear drive: the electromagnetic clutch (2) is opened, the brake (5) of the planetary carrier (10) and the brake (6) of the sun gear (8) are both opened, the drive motor (200) is in a reverse drive state, and the engine (100) and the drive motor (200) are driven together to form an engine (100) overspeed gear drive system.

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