Single-ring-gear dual-planetary-gearset hybrid power coupling structure and control method therefor

Abstract

A single-ring-gear dual-planetary-gearset hybrid power coupling structure and a control method therefor, which relate to the technical field of hybrid power. The single-ring-gear dual-planetary-gearset hybrid power coupling structure uses a dual-planetary-gearset dual-electric-motor structure, a front planetary gearset and a rear planetary gearset share a ring gear, a sun gear of the front planetary gearset and a sun gear of the rear planetary gearset are each connected to an electric motor, switching between operating states is achieved by means of changing the operating states of the planetary gearsets, thereby reducing the use of brakes and clutches, and simultaneous output from dual electric motors can be realized during pure electric driving, thereby improving the output power in a pure electric driving state, and reducing the power requirements for the electric motors.

Description

Single-pinion double-planetary row hybrid coupling structure and control method thereof

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 202410962391.9, filed on July 18, 2024, and entitled "Single-pinion double-planetary row hybrid coupling structure and control method thereof", the whole content of which is incorporated herein by reference and forms a part of the present application for all purposes. TECHNICAL FIELD

[0003] The present application relates to the field of hybrid technology, in particular to a single-pinion double-planetary row hybrid coupling structure and control method thereof. BACKGROUND

[0004] The key system of a hybrid electric vehicle is a hybrid power system. The existing dual-motor hybrid power system usually distinguishes between a generator and a drive motor. The generator is only used for power generation to supply the vehicle power battery and does not participate in driving the vehicle. In a pure electric driving state, only a single motor is used for driving, and the power requirement of the drive motor is relatively high.

[0005] A double-planetary row hybrid power system and control method are disclosed in a Chinese patent (publication number: CN110077219B). The front row of the front planetary row and the rear planetary carrier of the rear planetary row are connected. The output end of the first motor is connected to the front row sun gear of the front planetary row, and the output end of the second motor is connected to the rear row sun gear of the rear planetary row. A flywheel assembly is provided, and the flywheel assembly is connected to the front row gear ring through a second mode clutch. The double-planetary row is adopted, and the flywheel energy storage system is increased to achieve physical energy storage effect. The engine can work efficiently for a long time, and the power of the first motor and the second motor can be appropriately reduced. The double-tooth ring structure is independent of each other, and the power is split through the clutch. Multiple brakes and clutches need to be additionally arranged, resulting in a relatively complex structure and high cost. The double motors used are still an ISG motor for power generation and a TM motor for driving. In a pure electric driving state, only a single motor is used for driving, and the problem of high power requirement of the drive motor still exists. SUMMARY

[0006] The application aims at the defects of the prior art, and provides a single-ring gear double-planetary row hybrid power coupling structure and a control method thereof.

[0007] The first object of the application is to provide a single-ring gear double-planetary row hybrid power coupling structure, which adopts the following scheme:

[0008] The application comprises an engine, a first planetary row, a second planetary row, a first motor and a second motor, the first planetary row comprises a first sun gear, a first planet gear, a first planet carrier and a ring gear, the second planetary row comprises a second sun gear, a second planet gear, a second planet carrier and a ring gear, and the first planetary row and the second planetary row share the same ring gear; the output end of the engine is connected with the first planet carrier through an input shaft, the input / output end of the first motor is connected with the first sun gear, the input / output end of the second motor is connected with the second sun gear, and the second planet carrier is connected with an output shaft.

[0009] Further, one end of the ring gear is provided with a first inner gear ring, and the other end is provided with a second inner gear ring, the first planet gear is engaged with the first inner gear ring, and the second planet gear is engaged with the second inner gear ring.

[0010] Further, the first inner gear ring and the second inner gear ring are symmetrically distributed relative to the reference surface, and the first inner gear ring and the second inner gear ring rotate synchronously.

[0011] Further, the first motor and the second motor are both motor generators.

[0012] Further, a torsional damper is connected between the input shaft and the output end of the engine, and the output shaft is connected with a wheel end through a differential.

[0013] The second object of the application is to provide a control method of a single-ring gear double-planetary row hybrid power coupling structure, which is applied to the single-ring gear double-planetary row hybrid power coupling structure as described in the first object, and comprises the following steps:

[0014] When charging in place, the engine works, the engine drives the first motor and the second motor to generate electricity respectively, and stores the generated electricity in a power battery;

[0015] When running in pure electricity, the engine does not work, the first motor and / or the second motor work, and drive the output shaft to output;

[0016] When the series-parallel operation is performed, the engine works, the engine distributes power to the first motor for power generation and to the output shaft for output, the second motor works and drives the output shaft together with the motor.

[0017] Further, when the direct drive operation is performed, the engine works independently to drive the output shaft, and the first motor and the second motor do not work.

[0018] When the hybrid operation is performed, the engine works, the engine, the first motor and the second motor work together to drive the output shaft.

[0019] When the energy recovery is performed, the engine does not work, the output shaft drags the second motor to generate power, and the generated power is stored in the power battery.

[0020] Further, when the vehicle speed is not zero and is lower than the first set speed, the vehicle operating state is obtained.

[0021] If the vehicle is in the acceleration state, the first motor and the second motor work together to drive the output shaft.

[0022] If the vehicle is in the constant speed state, the first motor or the second motor works to drive the output shaft.

[0023] If the vehicle is in the deceleration state, the energy recovery is performed.

[0024] Further, when the vehicle speed is not lower than the first set speed and is not higher than the second set speed, the series-parallel operation is performed, the engine works and is in a working condition meeting the set fuel economy, drives the output shaft to operate, and the second motor serves as auxiliary power to assist the output shaft to operate.

[0025] Further, when the vehicle speed is higher than the second set speed, the vehicle operating state is obtained.

[0026] If the vehicle is in the acceleration state, the hybrid operation is performed, the engine, the first motor and the second motor work together to drive the output shaft.

[0027] If the vehicle is in the constant speed state, the direct drive operation is performed, the engine works to drive the output shaft.

[0028] If the vehicle is in the deceleration state, the energy recovery is performed.

[0029] Compared with the prior art, the present application has the advantages and positive effects that:

[0030] (1) In view of the problem that the power requirement of the driving motor is high in the current hybrid driving system, a double-motor structure with double planetary gears is adopted, the front planetary gear and the rear planetary gear share a ring gear, the sun gears of the front planetary gear and the rear planetary gear are respectively connected with motors, and the output power is increased in the pure electric driving state by changing the working state of the planetary gears when the working state is switched, so that the use of the brake and the clutch is reduced, and the double motors can simultaneously output in the pure electric driving state.

[0031] (2) The characteristics of the engine and the motor are fully utilized, a single-ring double planetary gear double-motor symmetric structure is adopted, the double motors can be used for driving and generating, and the double motors can be simultaneously driven or separately driven according to the requirement, so that the hybrid operation or the hybrid driving operation is realized, and the flexibility of the hybrid power output is improved.

[0032] (3) The double motors are used in cooperation with the engine, the engine can be kept in a working condition with better fuel economy when the vehicle speed is relatively high, the change of the vehicle speed can be realized by the motor auxiliary driving, the running fuel consumption of the engine is reduced, and the running power of the vehicle is ensured.

[0033] (4) The combination of different modes and states of the three input ends of the engine, the first motor and the second motor can produce a plurality of different working modes, the first motor and the second motor can generate and drive output, the pure electric double-motor output mode, the motor power utilization rate is high, the acceleration performance is good, the design requirement of the motor is reduced, the layout of the transmission device is optimized, the same motor can be used for the two motors, the batch procurement cost is effectively reduced, the first motor can replace the starting motor to start the engine, the structure is simplified, the cost is reduced, the engine can be directly driven, the power is directly output, the transmission efficiency is high, the optimal performance and fuel consumption driving vehicle can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0034] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the application, and do not constitute an improper limitation on the present application.

[0035] Fig. 1 is a schematic view of a single-ring double planetary gear hybrid power coupling structure in the embodiments 1 and 2 of the present application.

[0036] Fig. 2 is a schematic view of power supply when the vehicle is charging in place in the embodiments 1 and 2 of the present application.

[0037] Fig. 3 is a schematic view of power supply when the vehicle is running in the pure electric mode in the embodiments 1 and 2 of the present application.

[0038] Fig. 4 is a schematic view of power supply when the vehicle is running in the hybrid mode in the embodiments 1 and 2 of the present application.

[0039] Fig. 5 is a schematic diagram of power supply when directly driving in the embodiment 1 and 2 of the application.

[0040] Fig. 6 is a schematic diagram of power supply when energy is recovered in the embodiment 1 and 2 of the application.

[0041] Wherein, 1. engine, 2. torsional damper, 3. input shaft, 4. first motor, 5. first sun gear, 6. first planet gear, 7. first carrier, 8. ring gear, 9. second carrier, 10. second planet gear, 11. second sun gear, 12. second motor, 13. output shaft, 14. differential, 15. wheel end. DETAILED DESCRIPTION

[0042] Embodiment 1

[0043] In a typical embodiment of the application, as shown in Figs. 1-6, a single-ring dual planetary row hybrid power coupling structure is provided.

[0044] In the current dual-motor hybrid power system, physical energy storage is achieved by adding a flywheel energy storage system, thereby reducing the power of the dual-motor. However, after adding the flywheel energy storage system, a clutch and a brake suitable for the flywheel need to be additionally arranged, which increases the complexity of the structure. Moreover, the dual-motor still cannot realize dual-motor generation and dual-motor driving, and the motor is difficult to be effectively utilized, and the demand for driving motor power is still high. Based on this, the embodiment provides a single-ring dual planetary row dual-motor hybrid power system driving device, which adopts a single-ring dual planetary row dual-motor structure. The engine 1 can drive the dual-motor to charge at the same time, and the dual-motor can drive the output shaft 13 at the same time or separately to provide driving force, improve the output power in the pure electric driving state, and reduce the demand for motor power.

[0045] As shown in Fig. 1, a single-ring dual planetary row hybrid power coupling structure includes an engine 1, a first planetary row, a second planetary row, a first motor 4 and a second motor 12. The engine 1 cooperates with the first motor 4 and the second motor 12 to realize the switching of multiple operating states.

[0046] The first planetary gear train comprises a first sun gear 5, a first planetary gear 6, a first planetary carrier 7 and a ring gear 8, the first planetary gear 6 is rotatably installed on the first planetary carrier 7, the first sun gear 5 is coaxially distributed with the inner tooth ring of the ring gear 8, one side of the first planetary gear 6 is engaged with the inner tooth ring of the ring gear 8, the other side of the first planetary gear 6 is engaged with the first sun gear 5, and the shaft body of the first planetary carrier 7 is coaxially distributed with the ring gear 8; the second planetary gear train comprises a second sun gear 11, a second planetary gear 10, a second planetary carrier 9 and the ring gear 8, the second planetary gear 10 is rotatably installed on the second planetary carrier 9, the second sun gear 11 is coaxially distributed with the inner tooth ring of the ring gear 8, one side of the second planetary gear 10 is engaged with the inner tooth ring of the ring gear 8, the other side of the second planetary gear 10 is engaged with the second sun gear 11, and the shaft body of the second planetary carrier 9 is coaxially distributed with the ring gear 8. In the embodiment, the first planetary gear train and the second planetary gear train share the same ring gear 8 and are engaged with different positions of the ring gear 8.

[0047] The output end of the engine 1 is connected with the first planetary carrier 7 through the input shaft 3, the input and output ends of the first motor 4 are connected with the first sun gear 5, the input and output ends of the second motor 12 are connected with the second sun gear 11, the second planetary carrier 9 is connected with an output shaft 13, and the output shaft 13 can be connected with a wheel end 15 to provide power for the wheel end 15.

[0048] The first planetary gear train and the second planetary gear train share the same ring gear 8, one end of the ring gear 8 is provided with a first inner tooth ring, the other end is provided with a second inner tooth ring, the first planetary gear 6 is engaged with the first inner tooth ring, and the second planetary gear 10 is engaged with the second inner tooth ring, and the components of the first planetary gear train and the components of the second planetary gear train are isolated from each other except the ring gear 8.

[0049] Specifically, the vertical bisector of the axial midpoint of the ring gear 8 is taken as a reference surface, the first inner tooth ring and the second inner tooth ring are symmetrically distributed relative to the reference surface, and the first inner tooth ring and the second inner tooth ring rotate synchronously. After the first inner tooth ring and the second inner tooth ring are symmetrically distributed, the planetary gears, the planetary carriers and the sun gears matched with the first inner tooth ring and the second inner tooth ring are also in corresponding positions.

[0050] The first motor 4 and the second motor 12 are both motor generators, which can meet the requirements of output torque for driving the output shaft 13 when the motor is used for auxiliary driving, and can also meet the requirements of power generation when the kinetic energy is recovered or the engine 1 is driven. As shown in FIGS. 2, 4 and 6, the first motor 4 and the second motor 12 deliver the generated electric energy to a power battery for storage, and as shown in FIGS. 3 and 5, the first motor 4 and the second motor 12 take electric energy from the power battery when they output torque.

[0051] The first motor 4 and the second motor 12 can adopt a permanent magnet synchronous motor, which can be used as a motor to convert electric energy into mechanical energy, and can also be used as a generator to convert mechanical energy into electric energy; in other optional embodiments, other forms of motors can also be used as the first motor 4 and the second motor 12. The first motor 4 can be used to start the engine 1 instead of a starting motor, thereby simplifying the structure and reducing the cost.

[0052] The input shaft 3 is connected with the output end of the engine 1 through a torsional damper 2, and the output shaft 13 is connected with the wheel end 15 through a differential 14. The torsional damper 2 is mainly composed of elastic elements and damping elements, and can reduce the torsional stiffness of the crankshaft of the engine 1 and the joint part of the transmission system, thereby reducing the natural frequency of the torsional vibration of the transmission system. This can help to reduce the resonance phenomenon generated in the operation process of the transmission system, and improve the stability and smoothness of the transmission. The torsional damping of the transmission system is increased, and the amplitude generated due to torsional resonance is suppressed. The differential 14 can make the left and right wheels roll at different speeds when the vehicle turns, so as to ensure that the two drive wheels make pure rolling motion, and avoid the tire from slipping with the ground.

[0053] The characteristics of the engine 1 and the motor are fully utilized, and a single-tooth ring double-planetary row double-motor symmetrical structure is adopted, so that the double motors can be used for driving and generating electricity, and can be simultaneously driven or driven respectively according to the requirements, and the hybrid operation or hybrid operation can be realized, thereby improving the flexibility of the hybrid power output.

[0054] Embodiment 2

[0055] In another typical embodiment of the application, as shown in FIGS. 1-6, a control method of a single-tooth ring double-planetary row hybrid power coupling structure is given, which utilizes the single-tooth ring double-planetary row hybrid power coupling structure in embodiment 1.

[0056] Comprising:

[0057] When charging in place, as shown in FIG. 2, the engine 1 works, the engine 1 drives the first motor 4 and the second motor 12 to generate electricity respectively, and stores the generated electric energy in the power battery;

[0058] When running in pure electricity, as shown in FIG. 3, the engine 1 does not work, the first motor 4 and / or the second motor 12 work, and drive the output shaft 13 to output;

[0059] When hybrid operation, as shown in FIG. 4, the engine 1 works, the engine 1 divides the power to the first motor 4 for generating electricity and the output shaft 13 for output, and the second motor 12 works and cooperates with the motor to drive the output shaft 13;

[0060] When direct drive operation, as shown in FIG. 5, the engine 1 works independently to drive the output shaft 13 to output, and the first motor 4 and the second motor 12 do not work.

[0061] Hybrid operation, engine 1 participates in work, engine 1, first motor 4 and second motor 12 work together to drive output shaft 13;

[0062] Energy recovery, as shown in FIG. 6, engine 1 does not participate in work, output shaft 13 drags second motor 12 to generate electricity, and the generated electricity is stored in the power battery.

[0063] A kind of single tooth circle double planetary row hybrid coupling structure control method in multiple operating states, control a single tooth circle double planetary row hybrid coupling structure executes multiple working modes, corresponding to realize original charging mode, pure electric mode, hybrid mode, direct drive mode, hybrid mode and energy recovery mode.

[0064] After power reaches output shaft 13, it is distributed to wheel end 15 via differential 14.

[0065] As shown in FIG. 2, when the power battery is low, it can be switched to the original charging mode, and the original charging is performed, engine 1 drives first motor 4 and second motor 12 to operate to generate electricity, and the electrical energy is stored in the power battery.

[0066] Among them, combined with FIG. 1 and FIG. 3, the pure electric mode can also be divided into single motor pure electric mode and double motor pure electric mode according to the working state of first motor 4 or second motor 12.

[0067] When single motor pure electric mode is adopted, engine 1 and first motor 4 do not work, and second motor 12 drives output shaft 13 to drive the vehicle; or, engine 1 and second motor 12 do not work, and first motor 4 drives output shaft 13 to drive the vehicle.

[0068] When double motor pure electric mode is adopted, as shown in FIG. 3, engine 1 does not work, input shaft 3 and first planetary carrier 7 connected to input shaft 3 are locked, first motor 4 drives gear ring 8 to run through first sun gear 5, thereby driving second planetary gear 10 to move, at the same time, second motor 12 drives second planetary gear 10 to run through second sun gear 11, and first motor 4 is combined to drive output shaft 13 to run through second planetary carrier 9, and the vehicle is driven together.

[0069] Specifically, when pure electric mode is adopted, the working state of first motor 4 and second motor 12 can also be adjusted according to the motion state of the vehicle, including:

[0070] When the vehicle speed is not zero and lower than the first set speed, the vehicle running state is obtained;

[0071] If the vehicle is in an accelerating state, the dual-motor pure electric mode is executed, the first motor 4 and the second motor 12 work cooperatively to drive the output shaft 13; the dual-motor operation can improve the driving torque, the speed of the output shaft 13 can be changed by changing the torque and the speed of the two motors, the operation is convenient, the dual-motor output torque is adopted in the vehicle starting or accelerating state, the burst force is strong, the motor power utilization rate is high, the acceleration performance is good, and the power design requirement of the motor is reduced, thereby reducing the cost;

[0072] If the vehicle is in a uniform speed state, the single-motor pure electric mode is executed, the first motor 4 or the second motor 12 works to drive the output shaft 13; in the low-speed uniform speed pure electric state of the vehicle, the required torque is relatively low, the single-motor driving can meet the working condition requirement, and the electric energy loss is effectively reduced.

[0073] If the vehicle is in a decelerating state, energy recovery is executed.

[0074] As shown in FIG. 4, when the vehicle speed is not lower than the first set speed and not higher than the second set speed, the hybrid mode is adopted, the hybrid operation is executed, the engine 1 participates in the work and is in a working condition meeting the set fuel economy, the output shaft 13 is driven to operate, and the second motor 12 serves as an auxiliary power to transmit the torque coupled from the engine 1 to the output shaft 13 to drive the output shaft 13 to operate.

[0075] Specifically, the engine 1 is started and is in an optimal working state, part of the torque is transmitted to the first motor 4 through the output shaft 13, the first planet carrier 7, the first planet gear 6 and the first sun gear 5 to generate electricity, and another part of the torque is transmitted to the output shaft 13 through the output shaft 13, the first planet carrier 7, the first planet gear 6, the ring gear 8, the second planet gear 10 and the second planet carrier 9, and is distributed to the wheel end 15 through the differential 14, the torque of the second motor 12 is transmitted to the second planet carrier 9 through the second sun gear 11 and the second planet gear 10 connected with the second motor 12, and is transmitted to the output shaft 13 after being coupled with the torque transmitted from the engine 1 to be output, through the hybrid operation, the overall torque is improved, and the engine 1 is ensured to be in the optimal working state, thereby achieving fuel saving.

[0076] As shown in FIGS. 5 and 6, when the speed of the vehicle reaches the speed interval in which the fuel economy of the engine 1 is high, the engine 1 can execute the direct drive mode or the hybrid mode to ensure the fuel economy and the torque output of the engine 1.

[0077] When the vehicle speed is higher than the second set speed, the running state of the vehicle is acquired,

[0078] If the vehicle is in an accelerating state, switch to hybrid mode, perform hybrid operation, engine 1, first motor 4 and second motor 12 work together to drive output shaft 13; Torque is transmitted from output shaft 13, first planetary carrier 7, first planetary gear 6, ring gear 8, second planetary gear 10, second planetary carrier 9 to output shaft 13, and then distributed to wheel end 15 through differential 14; The torque output by the first motor 4 is transmitted to the second planetary carrier 9 through the first sun gear 5, the first planetary gear 6 and the ring gear 8 connected thereto; The torque of the second motor 12 is transmitted to the second planetary carrier 9 through the second sun gear 11 and the second planetary gear 10 connected thereto, and then coupled with the torque transmitted by the first motor 4 to be transmitted to the output shaft 13 for output, and then distributed to the wheel end 15 through the differential 14; The output torque of the first motor 4 and the second motor 12 serves as auxiliary power to increase the torque of the output shaft 13 and provide sufficient power for the vehicle to overtake at high speed;

[0079] If the vehicle is in a uniform speed state, switch to direct drive mode, perform direct drive operation, engine 1 works to drive output shaft 13; Torque is transmitted from output shaft 13, first planetary carrier 7, first planetary gear 6, ring gear 8, second planetary gear 10, second planetary carrier 9 to output shaft 13, and then distributed to wheel end 15 through differential 14; The first motor 4 and the second motor 12 are idling, and the torque of the engine 1 is directly transmitted to the output shaft 13 and then distributed to the wheel end 15 through the differential 14; In the high-speed driving state of the vehicle, the engine 1 directly drives the transmission with high efficiency and high fuel economy;

[0080] If the vehicle is in a decelerating state, switch to energy recovery mode, perform energy recovery.

[0081] As shown in FIG. 6, during the deceleration of the vehicle, when the state of charge of the vehicle battery does not exceed the upper limit of the battery state of charge, the vehicle enters the energy recovery mode, and torque is transmitted from the wheel end 15, the differential 14, the output shaft 13, the second planetary carrier 9, the second planetary gear 10, and the second sun gear 11 to the second motor 12. At this time, the second motor 12 generates electricity, which is supplied to the power battery for storage and released subsequently to reduce the energy consumption of the vehicle. On the other hand, the second motor 12 can provide braking force to decelerate the vehicle.

[0082] In the case of emergency braking, part of the torque is transmitted from the wheel end 15, the differential 14, the output shaft 13, the second planetary carrier 9, the second planetary gear 10, and the second sun gear 11 to the second motor 12, and the other part of the torque is transmitted from the wheel end 15, the differential 14, the output shaft 13, the second planetary carrier 9, the second planetary gear 10, the ring gear 8, the first planetary gear 6, and the first sun gear 5 to the first motor 4. At this time, the first motor 4 and the second motor 12 generate electricity simultaneously, recover energy and provide greater braking force to rapidly decelerate the vehicle.

[0083] It can be understood that the first set speed and the second set speed in the embodiment can be selected and adjusted according to requirements, the value of the second set speed is greater than the value of the first set speed, the first set speed can be 40 km / h, 50 km / h, etc., and the second set speed can be 90 km / h, 100 km / h, etc.

[0084] The combination of different modes and states of the three input ends of the engine 1, the first motor 4 and the second motor 12 can generate a plurality of different working modes, the first motor 4 and the second motor 12 can generate electricity and drive output, the pure electric double-motor output mode, the motor power utilization rate is high, the acceleration performance is good, at the same time, the design requirement of the motor is reduced, the layout of the transmission device is optimized, the two motors can adopt the same configuration of the motor, the batch procurement cost is effectively reduced, the first motor 4 can replace the starting motor to start the engine 1, the structure is simplified, the cost is reduced, and the engine 1 can be directly driven, the power is directly output, the transmission efficiency is high, the vehicle can achieve optimal performance and fuel consumption.

[0085] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A single-pawl-ring two-planet-row hybrid coupling structure, characterized by, The power split transmission comprises an engine, a first planetary gear set, a second planetary gear set, a first motor and a second motor, the first planetary gear set comprises a first sun gear, a first planet gear, a first planet carrier and a ring gear, the second planetary gear set comprises a second sun gear, a second planet gear, a second planet carrier and a ring gear, the first planetary gear set and the second planetary gear set share the same ring gear; an output end of the engine is connected to the first planet carrier through an input shaft, an input / output end of the first motor is connected to the first sun gear, an input / output end of the second motor is connected to the second sun gear, and the second planet carrier is connected to an output shaft.

2. The single-pulley double-row planetary hybrid coupling structure according to claim 1, characterized by The ring gear is provided with a first inner gear ring at one end and a second inner gear ring at the other end, the first planet gear is engaged with the first inner gear ring, and the second planet gear is engaged with the second inner gear ring.

3. The single-pulley double-row planetary hybrid coupling structure according to claim 2, characterized by The first inner gear ring and the second inner gear ring are symmetrically distributed relative to a reference surface which is a vertical bisector of the axial midpoint of the ring gear, and the first inner gear ring and the second inner gear ring rotate synchronously.

4. The single-pulley double-row planetary hybrid coupling structure according to claim 1, characterized by The first motor and the second motor are both motor generators.

5. The single-pulley dual-planet row hybrid coupling structure according to claim 1, characterized by, A torsional damper is connected between the input shaft and the output end of the engine, and the output shaft is connected to wheels through a differential.

6. A control method of a single-pulley double-planetary-row hybrid coupling structure, applied to the single-pulley double-planetary-row hybrid coupling structure according to any one of claims 1-5, characterized in that, The power split transmission comprises: When charging in place, the engine works, the engine drives the first motor and the second motor to generate electricity, and the generated electricity is stored in a power battery; When running in pure electric mode, the engine does not work, the first motor and / or the second motor works to drive the output shaft to output; When running in series-parallel mode, the engine works, the engine splits power to the first motor to generate electricity and to the output shaft to output, and the second motor works to drive the output shaft together with the motor generator; 7. The control method of the single-pawl-clutch two-row-planet hybrid coupling structure according to claim 6, characterized by, When running in direct drive mode, the engine works independently to drive the output shaft to output, and the first motor and the second motor do not work; When running in hybrid mode, the engine works, the engine, the first motor and the second motor work together to drive the output shaft; When energy is recovered, the engine does not work, the output shaft drags the second motor to generate electricity, and the generated electricity is stored in the power battery.

8. The control method of the single-pawl-clutch two-row-planet hybrid coupling structure according to claim 7, characterized by, When the vehicle speed is not zero and is lower than a first set speed, the running state of the vehicle is obtained; If the vehicle is in an acceleration state, the first motor and the second motor work together to drive the output shaft; If the vehicle is in a constant speed state, the first motor or the second motor works to drive the output shaft; If the vehicle is in a deceleration state, energy is recovered.

9. The control method of the single-pawl-clutch two-row-planet hybrid coupling structure according to claim 7, characterized by, When the vehicle speed is not lower than the first set speed and is not higher than a second set speed, series-parallel running is performed, the engine works and is in a working condition that meets a set fuel economy, the output shaft runs, and the second motor serves as auxiliary power to assist the output shaft to run.

10. The control method of the single-pawl-clutch two-row-planet hybrid coupling structure according to claim 7, characterized by, When the vehicle speed is higher than the second set speed, the running state of the vehicle is obtained; If the vehicle is in an acceleration state, hybrid running is performed, the engine, the first motor and the second motor work together to drive the output shaft; If the vehicle is in a constant speed state, direct drive running is performed, the engine works to drive the output shaft; If the vehicle is in a deceleration state, energy is recovered.

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