Hybrid drive transmission system and control method

Abstract

The present invention discloses a hybrid drive transmission system and a control method, which includes an engine assembly, a first motor assembly, a second motor assembly, a gear assembly, a planetary gear set, and a power output assembly. The engine assembly is in transmission connection with the first motor assembly. The input end of the planetary gear set is connected to the output shaft of the engine assembly. The gear assembly includes a first gear and a second gear that mesh with each other. The first gear is connected to the output end of the planetary gear set. The second gear is connected to the input end of the power output assembly and is in transmission connection with the second motor assembly. The hybrid drive transmission system further includes a first brake, a second brake, and a clutch, and the first brake, the second brake, and the clutch can be switched between a engaged state and a disengaged state. This system reduces the volume of the transmission system and shrinks the layout space. This hybrid drive transmission system improves the fuel-saving effect of hybrid vehicles under different working conditions and the power performance under high vehicle speeds and high loads.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid power, and in particular to a hybrid power drive transmission system and a control method. Background Art

[0002] Hybrid vehicles can take into account the advantages of traditional internal combustion engine vehicles and pure electric vehicles, and can meet the needs of complex road conditions while achieving energy conservation and emission reduction, adapting to the requirements of today's society. Hybrid vehicles involve at least two different power sources for driving. Since there are engines, generators and drive motors at the same time, the connection and control between the three directly affects the performance of hybrid vehicles.

[0003] At present, hybrid vehicles generally adopt series, parallel or power split hybrid systems (i.e. series, parallel and hybrid modes). In the series hybrid system, the engine cannot directly drive the car, the overall system efficiency is low under some working conditions, and the motor and controller have large capacity and high cost. The engine and motor of the parallel hybrid system can be controlled independently, but the engine speed cannot be decoupled from the speed of the drive wheel, the motor's ability to regulate the engine is limited, and the power is weak under low-speed and heavy-load conditions. The power split hybrid system engine (hybrid) can achieve stepless speed change, but requires motor speed regulation, has high requirements for motor speed, and the ratio of mechanical transmission to electric transmission is fixed. The system efficiency is reduced under high-speed conditions, the fuel saving effect is reduced, and the high-speed power is weak.

[0004] Therefore, the existing single hybrid modes have defects when working, and the single hybrid power system has technical problems such as low working efficiency and weak power. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problems in the prior art that a single hybrid mode has defects when working, and a single hybrid power system has low working efficiency and weak power.

[0006] To solve the above technical problems, an embodiment of the present invention discloses a hybrid power drive transmission system, including an engine assembly, a first motor assembly, a second motor assembly, a gear assembly, a planetary gear and a power output assembly, the engine assembly is transmission-connected to the first motor assembly, the input end of the planetary gear is connected to the output shaft of the engine assembly, the gear assembly includes a first gear and a second gear that are meshed with each other, the first gear is connected to the output end of the planetary gear, the second gear is connected to the input end of the power output assembly and is transmission-connected to the second motor assembly.

[0007] The planetary gear set includes a first sun gear, a first planet gear, a planet carrier, a second sun gear, a second planet gear, and a ring gear. The first sun gear is fixedly arranged on the output shaft of the engine assembly. The inner ring of the first planet gear meshes with the first sun gear. The outer ring of the first planet gear meshes with the inner ring of the second planet gear. Both the first planet gear and the second planet gear are arranged on the planet carrier. The outer ring of the second planet gear meshes with the inner ring of the ring gear. The second sun gear is separated and oppositely arranged on one side of the first sun gear. The second sun gear meshes with the inner ring of the second planet gear. A rotating shaft is arranged on the second sun gear.

[0008] The hybrid drive transmission system further includes a first brake, a second brake, and a clutch. The first brake is arranged on the planet carrier and can be switched between a engaged state and a disengaged state with the planet carrier. The second brake is arranged on the rotating shaft of the second sun gear and can be switched between an engaged state and a disengaged state with the rotating shaft. The clutch is arranged between the planet carrier and the rotating shaft and can control the switching between a disengaged state and an engaged state of the planet carrier and the rotating shaft.

[0009] With the above technical solution, setting the first motor assembly, the second motor assembly, and the planetary gear set in the system can achieve multiple modes such as pure electric drive of the motor, direct drive in three gears of the engine, series drive of the engine assembly, the first motor assembly, and the second motor assembly, and parallel drive of the engine assembly, the first motor assembly, and the second motor assembly. That is, the hybrid drive transmission system can achieve multi-mode drives such as pure electric, series, parallel, and hybrid. Through reasonable control, the vehicle can adapt to various driving conditions, improve the efficiency and power performance of the hybrid system, and solve the problems of low efficiency and weak power performance of hybrid vehicles under a single driving condition.

[0010] Furthermore, two motors are set in this application. The 3-speed transmission of the planetary gear mechanism is realized through one clutch and two brakes. The structure is simple, the control is convenient, and the volume of the transmission system is reduced, the layout space of the transmission system is narrowed, the decoupling degree between the engine and the motor is improved, and the fuel-saving effect under urban conditions and the power performance at high vehicle speeds and high loads are enhanced.

[0011] The embodiment of the present invention also discloses a hybrid drive transmission system. The engine assembly includes an engine, a torsional damper, and a one-way brake. The torsional damper and the one-way brake are sequentially arranged on the output shaft of the engine. The output shaft of the engine constitutes the output shaft of the engine assembly.

[0012] Adopting the above technical solution, a torsional damper is provided to reduce the torsional stiffness of the joint part between the engine crankshaft and the transmission system, thereby reducing the natural frequency of torsional vibration of the transmission system. The torsional damping of the transmission system is increased to suppress the amplitude corresponding to torsional resonance and attenuate the transient torsional vibration generated by impact. The torsional impact load of the transmission system under non-steady conditions is mitigated, and the smoothness of clutch engagement is improved. A one-way brake is provided to prevent the engine from reversing.

[0013] An embodiment of the present invention also discloses a hybrid drive transmission system, in which the first gear and the ring gear are integrally formed, and the first gear and the ring gear are rotatably arranged on the output shaft of the engine.

[0014] Adopting the above technical solution, the first gear and the ring gear are integrally formed, and power can be transmitted from the planetary gear set to the first gear and then to the power output component through the first gear and the ring gear, reducing the transmission path and having a simple structure.

[0015] An embodiment of the present invention also discloses a hybrid drive transmission system, in which the first motor assembly is arranged on the side of the one-way brake and away from the engine. The first motor assembly includes a first motor, a third gear, and a fourth gear. The output shaft of the first motor is connected to the third gear, the third gear is externally meshed with the fourth gear, and the fourth gear is fixedly arranged on the output shaft of the engine and is located between the one-way brake and the first gear.

[0016] Adopting the above technical solution, when the first motor outputs power, it can transmit power to the engine output shaft through the third gear and the fourth gear. When the first motor generates electricity, it can transmit the power of the engine output shaft through the third gear and the fourth gear for power generation. And it is arranged on one side of the one-way brake to prevent the engine from reversing.

[0017] An embodiment of the present invention also discloses a hybrid drive transmission system, in which the power output component includes a fifth gear and a sixth gear. The fifth gear is coaxially connected to the second gear, the fifth gear and the sixth gear are externally meshed and form a reduction gear pair. The fifth gear is the input end of the power output component, and the sixth gear is the output end of the power output component.

[0018] Adopting the above technical solution, by forming the power output component with the fifth gear and the sixth gear, the system can transmit power through one path of the fifth gear and the sixth gear regardless of which working mode or working state it is in.

[0019] An embodiment of the present invention also discloses a hybrid drive transmission system, in which the second motor assembly includes a second motor and a seventh gear. The seventh gear is arranged on the output shaft of the second motor and is externally meshed with the second gear.

[0020] With the above technical solution, when the second motor outputs power, it can transmit power to the power output component through the seventh gear; when the second motor generates electricity, the seventh gear can transmit the power of the power output component to the second motor for power generation.

[0021] An embodiment of the present invention also discloses a control method for a hybrid drive transmission system, which is applicable to the hybrid drive transmission system of any of the above, and the control method includes the following steps:

[0022] S1: Obtain the start information of the vehicle, and determine whether the vehicle starts according to the start information of the vehicle;

[0023] If so, execute step S2;

[0024] If not, continue to determine whether the vehicle starts;

[0025] S2: Obtain the status information of the vehicle from the on-vehicle computer of the vehicle, and determine whether the vehicle is in a driving state currently according to the status information of the vehicle;

[0026] If the vehicle is in a driving state currently, execute step S3;

[0027] If the vehicle is not in a driving state currently, continue to determine whether the vehicle is in a driving state currently;

[0028] S3: Obtain the battery status information in the battery management system of the vehicle and the vehicle speed information in the on-vehicle computer, and control the hybrid drive transmission system to enter different working modes according to the comparison results of the battery status information and the vehicle speed information with the preset threshold information. The working modes include pure electric mode, series mode, engine direct drive mode, and parallel mode; where

[0029] If the battery status information is greater than the first power threshold and the vehicle speed information is less than the first speed threshold, the hybrid drive transmission system enters the pure electric mode;

[0030] If the battery status information is less than the second power threshold and the vehicle speed information is less than the first speed threshold, the hybrid drive transmission system enters the series mode, where the second power threshold is less than the first power threshold;

[0031] If the battery status information is greater than or equal to the second power threshold and less than or equal to the first power threshold, and the vehicle speed information is greater than the second speed threshold, the hybrid drive transmission system enters the engine direct drive mode, where the second speed threshold is greater than the first speed threshold;

[0032] When the battery status information is greater than or equal to the second power threshold and less than or equal to the first power threshold, and the vehicle speed information is greater than the second speed threshold, and the on-vehicle computer detects the operation of the accelerator pedal or the brake pedal, the hybrid drive transmission system enters the parallel mode.

[0033] Adopting the above technical solution, the control method can control the hybrid drive transmission system to perform four different working modes: pure electric mode, series mode, engine direct drive mode, and parallel mode, and control the system to switch between different modes by detecting different speed information and battery information of the vehicle. By switching between different modes, the defects of a single hybrid mode can be effectively solved, and the system efficiency and power performance can be improved.

[0034] An embodiment of the present invention also discloses a control method. In step S3, when the hybrid drive transmission system enters the pure electric mode, the engine assembly and the first motor assembly are in a shutdown state, the first brake, the second brake, and the clutch are disengaged, the planetary gearset rotates idly, and the second motor assembly operates and outputs power.

[0035] Adopting the above technical solution, when the vehicle speed is low and the battery power is sufficient, the second motor assembly operates and outputs power, with high working efficiency and can meet the power requirements for vehicle driving.

[0036] An embodiment of the present invention also discloses a control method. In step S3, when the hybrid drive transmission system enters the series mode, the engine assembly operates and outputs power to the first motor assembly for the first motor assembly to generate electricity, the first motor assembly operates and is in a power generation state, the second motor assembly operates and outputs power to the power output assembly, the first brake, the second brake, and the clutch are disengaged, the planetary gearset rotates idly, and the engine assembly does not output power to the power output assembly.

[0037] Adopting the above technical solution, when the vehicle speed is low and the battery power is insufficient, the engine operates but does not output power. When the engine rotates, it drives the first motor to generate electricity and charges the battery, and the second motor operates for power output.

[0038] An embodiment of the present invention also discloses a control method. In step S3, when the hybrid drive transmission system enters the engine direct drive mode, the engine assembly drives the planetary gearset to rotate, and the first motor assembly and the second motor assembly rotate idly, where:

[0039] When the first brake is engaged and the second brake and the clutch are disengaged, the vehicle is in the first gear of engine direct drive;

[0040] When the second brake is engaged and the first brake and the clutch are disengaged, the vehicle is in the second gear of engine direct drive;

[0041] When the clutch is engaged and the first brake and the second brake are disengaged, the vehicle is in the direct engine drive third gear.

[0042] With the above technical solution, when the vehicle speed is high and the series efficiency is lower than the direct engine drive efficiency, the direct engine drive mode is entered, and the direct engine drive mode includes three different gears, meeting the requirements of different vehicle speeds and different powers. And when the vehicle switches between the direct engine drive first gear, the direct engine drive second gear, and the direct engine drive third gear, it only needs to separately change the state of the engagement of the first brake, the second brake, or the clutch, which is simple and convenient to control, and has high efficiency and rapid response.

[0043] An embodiment of the present invention also discloses a control method. In step S3, when the hybrid drive transmission system enters the parallel mode, the engine assembly and the planetary gear set rotate and output power; wherein:

[0044] When the first motor assembly and the engine assembly work simultaneously, the vehicle is in the first motor parallel gear.

[0045] When the second motor assembly and the engine assembly work simultaneously, the vehicle is in the second motor parallel gear.

[0046] When the first motor assembly, the second motor assembly, and the engine assembly work simultaneously, the vehicle is in the hybrid parallel gear.

[0047] With the above technical solution, in the direct engine drive mode, the first motor and the second motor work in coordination according to the driving state of the vehicle to adjust the engine torque so that it operates in the high-efficiency area, improving the system efficiency.

[0048] The beneficial effects of the present invention are:

[0049] The present invention discloses a hybrid drive transmission system and a control method. The hybrid drive transmission system includes an engine assembly, a first motor assembly, a second motor assembly, a gear assembly, a planetary gear set, and a power output assembly. A first brake, a second brake, and a clutch are provided on the planetary gear set. When the system works, by controlling the separate operation of the first brake, the second brake, or the clutch and switching between the engaged state and the disengaged state, the hybrid drive transmission system is controlled to achieve three-speed changes of the planetary gear set. The system realizes 3-speed transmission of the planetary gear mechanism through one clutch and two brakes, has a simple structure, is convenient to control, reduces the volume of the transmission system, shrinks the layout space of the transmission system, improves the decoupling degree between the engine and the motor, and enhances the fuel-saving effect in urban working conditions and the power performance at high vehicle speeds and high loads.

[0050] The control method of the hybrid drive transmission system disclosed by the present invention can, according to the state information of the vehicle, control the system to switch among pure electric mode, series mode, engine direct drive mode and parallel mode. By switching among different modes, the defects of a single hybrid mode can be effectively solved, enabling the vehicle to adapt to various driving conditions, improving the efficiency and power performance of the hybrid system, and solving the problems of low efficiency and weak power performance of hybrid vehicles under a single driving condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 FIG. is a schematic diagram of the hybrid drive transmission system provided by an embodiment of the present invention;

[0052] Figure 2 FIG. is a schematic flow chart of the control method of the hybrid drive transmission system provided by an embodiment of the present invention.

[0053] DESCRIPTION OF REFERENCE NUMERALS:

[0054] 1, engine; 2, torsional damper; 3, one-way brake;

[0055] 4, first motor; 5, third gear; 6, fourth gear;

[0056] 7, first gear; 8, second gear;

[0057] 9, fifth gear; 10, sixth gear;

[0058] 11, second motor; 12, seventh gear;

[0059] 13, first sun gear, 14, first planet gear, 15, planet carrier; 16, second sun gear; 17, second planet gear; 18, ring gear;

[0060] 19, first brake; 20, second brake; 21, clutch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with preferred embodiments, this does not mean that the features of this invention are limited to this implementation manner. On the contrary, the purpose of introducing the invention in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present invention. To provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without these details. In addition, in order to avoid confusing or obscuring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0062] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0063] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0064] The terms "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0065] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0066] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the drawings.

[0067] The embodiment of the present disclosure discloses a hybrid drive transmission system, as Figure 1 shown, which includes an engine assembly, a first motor assembly, a second motor assembly, a gear assembly, a planetary gear set, and a power output assembly. The engine assembly is in transmission connection with the first motor assembly. The input end of the planetary gear set is connected to the output shaft of the engine assembly. The gear assembly includes a first gear 7 and a second gear 8 that mesh with each other. The first gear 7 is connected to the output end of the planetary gear set. The second gear 8 is connected to the input end of the power output assembly and is in transmission connection with the second motor assembly.

[0068] The planetary gear set includes a first sun gear 13, a first planet gear 14, a planet carrier 15, a second sun gear 16, a second planet gear 17 and a ring gear 18. The first sun gear 13 is fixedly arranged on the output shaft of the engine assembly. The inner ring of the first planet gear 14 meshes with the first sun gear 13. The outer ring of the first planet gear 14 meshes with the inner ring of the second planet gear 17. Both the first planet gear 14 and the second planet gear 17 are arranged on the planet carrier 15. The outer ring of the second planet gear 17 meshes with the inner of the ring gear 18. The second sun gear 16 is separated and oppositely arranged on one side of the first sun gear 13. The second sun gear 16 meshes with the inner ring of the second planet gear 17. A rotating shaft is arranged on the second sun gear 16.

[0069] The hybrid drive transmission system further includes a first brake 19, a second brake 20 and a clutch 21. The first brake 19 is arranged on the planet carrier 15 and can be switched between a engaged state and a disengaged state with the planet carrier 15. The second brake 20 is arranged on the rotating shaft of the second sun gear 16 and can be switched between an engaged state and a disengaged state with the rotating shaft. The clutch 21 is arranged between the planet carrier 15 and the rotating shaft and can control the switching between a disengaged state and an engaged state of the planet carrier 15 and the rotating shaft.

[0070] Specifically, as Figure 1 shown, the engine assembly includes an engine 1, a torsional damper 2 and a one-way brake 3. The first motor assembly includes a first motor 4, a third gear 5 and a fourth gear 6. The power output assembly includes a fifth gear 9 and a sixth gear 10. The second motor assembly includes a second motor 11 and a seventh gear 12.

[0071] More specifically, in this embodiment, the planetary gear set is preferably set as a Ravigneaux planetary gear set, which realizes three-speed shifting through the Ravigneaux planetary gear set, and has a simple structure and is also simple and convenient to operate. The specific shifting process is as follows:

[0072] When the first brake 19 is engaged and the second brake 20 and the clutch 21 are disengaged, the vehicle is in the first gear of engine direct drive;

[0073] When the second brake 20 is engaged and the first brake 19 and the clutch 21 are disengaged, the vehicle is in the second gear of engine direct drive;

[0074] When the clutch 21 is engaged and the first brake 19 and the second brake 20 are disengaged, the vehicle is in the third gear of engine direct drive.

[0075] Braking is performed through a single brake or a clutch 21, so that the system enters different gears, reducing the number of brakes or clutches 21 in the traditional hybrid system, reducing the volume, facilitating installation and having a relatively fast gear shifting response speed.

[0076] Specifically, in this embodiment, the first motor assembly, the second motor assembly, and the planetary gear set are arranged in the system to enable multiple driving modes, including pure electric drive by the motor, direct drive in three gears of the engine 1, series drive of the engine assembly, the first motor assembly, and the second motor assembly, and parallel drive of the engine assembly, the first motor assembly, and the second motor assembly. That is, the hybrid drive transmission system can achieve multi-mode drives such as pure electric, series, parallel, and hybrid. Through reasonable control, the vehicle can adapt to various driving conditions, improve the efficiency and power performance of the hybrid system, and solve the problems of low efficiency and weak power performance of hybrid vehicles under a single driving condition.

[0077] Furthermore, in this embodiment, two motors are provided, and a 3-speed gearshift of the planetary gear mechanism is achieved through a clutch and two brakes. The structure is simple, the control is convenient, and the volume of the transmission system is reduced, the layout space of the transmission system is minimized, the decoupling degree between the engine 1 and the motor is improved, and the fuel-saving effect under urban conditions and the power performance at high vehicle speeds and high loads are enhanced.

[0078] The implementation manner of this embodiment also discloses a hybrid drive transmission system, as Figure 1 shown. The engine assembly includes an engine 1, a torsional damper 2, and a one-way brake 3. The torsional damper 2 and the one-way brake 3 are sequentially arranged on the output shaft of the engine 1, and the output shaft of the engine 1 constitutes the output shaft of the engine assembly.

[0079] Specifically, in this embodiment, the torsional damper 2 is arranged at the output end of the engine 1. The torsional damper 2 is provided to reduce the torsional stiffness of the joint part between the crankshaft of the engine 1 and the transmission system, thereby reducing the torsional vibration natural frequency of the transmission system. The torsional damping of the transmission system is increased to suppress the amplitude of the torsional resonance response and attenuate the transient torsional vibration generated by the impact. The torsional shock load of the transmission system under unstable conditions is alleviated, and the engagement smoothness of the clutch 21 is improved. The one-way brake 3 is arranged on the output shaft of the engine 1 and behind the torsional damper 2. The one-way brake 3 is provided to prevent the engine 1 from reversing.

[0080] The implementation manner of this embodiment also discloses a hybrid drive transmission system, as Figure 1 shown. The first gear 7 and the ring gear 18 are integrally formed, and the first gear 7 and the ring gear 18 are rotatably arranged on the output shaft of the engine 1.

[0081] Specifically, in this embodiment, the first gear 7 and the ring gear 18 are integrally formed. The power can be transmitted from the planetary gear set to the first gear 7 and then to the power output assembly through the first gear 7 and the ring gear 18, reducing the transmission path and having a simple structure. Moreover, since the first gear 7 and the ring gear 18 are rotatably arranged on the output shaft of the engine 1, with this structural design, it can be ensured that when the planetary gear set is idling, the power cannot be transmitted from the ring gear 18 and the first gear 7 to the power output assembly. When the planetary gear set is working, the power is transmitted from the ring gear 18 and the first gear 7 to the power output assembly, and when the second motor 11 is working, the power is not transmitted to the planetary gear set either.

[0082] The embodiment of this embodiment also discloses a hybrid drive transmission system. The first motor assembly is arranged at the side of the one-way brake 3 and away from one end of the engine 1. The first motor assembly includes a first motor 4, a third gear 5 and a fourth gear 6. The output shaft of the first motor 4 is connected to the third gear 5. The third gear 5 is externally meshed with the fourth gear 6. The fourth gear 6 is fixedly arranged on the output shaft of the engine 1 and is located between the one-way brake 3 and the first gear 7.

[0083] Specifically, in this embodiment, when the first motor 4 outputs power, it can transmit the power to the output shaft of the engine 1 through the third gear 5 and the fourth gear 6. When the first motor 4 generates electricity, it can transmit the power of the output shaft of the engine 1 through the third gear 5 and the fourth gear 6 for power generation. And it is arranged on one side of the one-way brake 3 to prevent the engine 1 from reversing.

[0084] The embodiment of this embodiment also discloses a hybrid drive transmission system. The power output assembly includes a fifth gear 9 and a sixth gear 10. The fifth gear 9 is coaxially connected to the second gear 8. The fifth gear 9 is externally meshed with the sixth gear 10 and forms a reduction gear pair. The fifth gear 9 is the input end of the power output assembly, and the sixth gear 10 is the output end of the power output assembly.

[0085] Specifically, in this embodiment, by forming the power output assembly with the fifth gear 9 and the sixth gear 10, it enables the system to transmit power through one path of the fifth gear 9 and the sixth gear 10 regardless of which working mode or working state it is in.

[0086] The embodiment of this embodiment also discloses a hybrid drive transmission system. The second motor assembly includes a second motor 11 and a seventh gear 12. The seventh gear 12 is arranged on the output shaft of the second motor 11, and the seventh gear 12 is externally meshed with the second gear 8.

[0087] Specifically, in this embodiment, when the second motor 11 outputs power, it can transmit power to the power output assembly through the seventh gear 12; when the second motor 11 generates electricity, the seventh gear 12 can transmit the power of the power output assembly to the second motor 11 for power generation.

[0088] The embodiment mode of this embodiment also discloses a control method for a hybrid drive transmission system, which is applicable to the hybrid drive transmission system of any of the above, such as Figure 2 As shown, the control method includes the following steps:

[0089] S1: Obtain the start information of the vehicle, and judge whether the vehicle starts according to the start information of the vehicle;

[0090] If so, execute step S2;

[0091] If not, continue to judge whether the vehicle starts.

[0092] Specifically, in step S1, when judging whether the vehicle starts, the judgment basis can be that the engine 1 ignites, rotates, or the vehicle starts in the prior art. Those skilled in the art can set according to different vehicles, and this embodiment does not make specific limitations on this.

[0093] S2: Obtain the status information of the vehicle from the on-vehicle computer of the vehicle, and judge whether the vehicle is currently in a driving state according to the status information of the vehicle;

[0094] If the vehicle is currently in a driving state, execute step S3;

[0095] If the vehicle is not currently in a driving state, continue to judge whether the vehicle is currently in a driving state;

[0096] Specifically, in step S2, when judging whether the vehicle is currently in a driving state, the judgment basis can also be common states in the prior art such as the engine 1 rotating, the wheels rotating, the vehicle moving forward or backward, etc. Those skilled in the art can set according to different vehicles, and this embodiment does not make specific limitations on this.

[0097] S3: Obtain the battery status information in the battery management system of the vehicle and the vehicle speed information in the on-vehicle computer, and control the hybrid drive transmission system to enter different working modes according to the comparison results of the battery status information and the vehicle speed information with the preset threshold information. The working modes include pure electric mode, series mode, engine direct drive mode, and parallel mode; among them,

[0098] If the battery status information is greater than the first power threshold and the vehicle speed information is less than the first speed threshold, the hybrid drive transmission system enters the pure electric mode;

[0099] Specifically, in this embodiment, the first power threshold can be set to 80% of the rated power of the vehicle battery, or it can be 70%, 60% of the rated power, or other power thresholds of different magnitudes. The specific set value can be adjusted or preset by those skilled in the art according to different vehicle models and different road conditions. This embodiment does not make a unique limitation on this.

[0100] More specifically, in this embodiment, the first speed threshold of the vehicle speed information can be set to 30 km / h, or it can be set to 40 km / h, 50 km / h, or other speed thresholds. For example, the first speed threshold is larger when the vehicle is driving in the urban area, and the first speed threshold is smaller when the vehicle is driving in complex road conditions or mountainous areas. For example, when the battery power is 90% and the vehicle speed is 25 km / h, the hybrid drive transmission system enters the pure electric mode. The specific set value can be adjusted or preset by those skilled in the art according to different vehicle models and different road conditions. This embodiment also does not make a unique limitation on this.

[0101] If the battery state information is less than the second power threshold and the vehicle speed information is less than the first speed threshold, the hybrid drive transmission system enters the series mode, where the second power threshold is less than the first power threshold;

[0102] Specifically, in this embodiment, the second power threshold can be set to 40%, 30%, 20% of the rated power, or other power thresholds of different magnitudes. For example, when the battery power is 15%, the hybrid drive transmission system enters the series mode. The specific set value can be adjusted or preset by those skilled in the art according to different vehicle models and different road conditions. This embodiment also does not make a unique limitation on this.

[0103] If the battery state information is greater than or equal to the second power threshold and less than or equal to the first power threshold, and the vehicle speed information is greater than the second speed threshold, the hybrid drive transmission system enters the engine direct drive mode, where the second speed threshold is greater than the first speed threshold;

[0104] Specifically, in this embodiment, the second speed threshold can be 70 km / h, 75 km / h, 80 km / h, 90 km / h, or other thresholds. The specific set value can be adjusted or preset by those skilled in the art according to different vehicle models and different road conditions. For example, when the battery power is 45% and the vehicle speed is 95 km / h, the hybrid drive transmission system enters the engine direct drive mode. This embodiment also does not make a unique limitation on this.

[0105] It should be noted that when the vehicle detects driving conditions such as being on a mountain road or climbing a slope, it can also enter the engine direct drive mode without reaching the second speed threshold. This embodiment does not make a specific limitation on this.

[0106] When the battery status information is greater than or equal to the second power threshold and less than or equal to the first power threshold, and the vehicle speed information is greater than the second speed threshold, and the on-vehicle computer detects the action of the accelerator pedal or the brake pedal, the hybrid drive transmission system enters the parallel mode.

[0107] Specifically, in this embodiment, there are many working states when the hybrid drive transmission system enters the parallel mode. It can enter the parallel mode when the battery status information is greater than or equal to the second power threshold and less than or equal to the first power threshold, and the vehicle speed information is greater than the second speed threshold. It can also be that when the on-vehicle computer detects the action of the accelerator pedal or the brake pedal, it enters the parallel mode from the engine direct drive mode. For example, when the battery power is 50% and the vehicle speed is 100 km / h, after the driver steps on the accelerator, the hybrid drive transmission system enters the parallel mode. Specifically, it can be adjusted or preset by those skilled in the art according to different vehicle models and different road conditions. This embodiment does not make a unique limitation on this either.

[0108] Adopting the above technical solution, the control method can control the hybrid drive transmission system to perform four different working modes: pure electric mode, series mode, engine direct drive mode, and parallel mode, and control the system to switch between different modes by detecting different speed information and battery information of the vehicle. By switching between different modes, the defects of a single hybrid mode can be effectively solved, and the system efficiency and power performance can be improved.

[0109] The embodiment of the present implementation manner also discloses a control method. In step S3, when the hybrid drive transmission system enters the pure electric mode, the engine assembly and the first motor assembly are in a shutdown state, the first brake 19, the second brake 20, and the clutch 21 are disengaged, the planetary gear is idling, and the second motor assembly works and outputs power.

[0110] Specifically, in this embodiment, as shown in Table 1, when the hybrid drive transmission system enters the pure electric mode, it can include two modes: pure electric forward and pure electric reverse.

[0111] Table 1

[0112]

[0113] As shown in Table 1, in the pure electric forward mode and the pure electric reverse mode, the engine 1 does not work, and the first motor 4 does not work either. At this time, the planetary gear is idling, and the first brake 19, the second brake 20, and the clutch 21 are all disengaged. In the pure electric forward mode, the second motor 11 rotates forward; in the pure electric reverse mode, the second motor 11 rotates in reverse. The power transmission path of the system in this mode is:

[0114] The rotation of the second motor 11 drives the rotation of the seventh gear 12. The rotation of the seventh gear 12 drives the rotation of the second gear 8. The rotation of the second gear 8 drives the rotation of the fifth gear 9. The fifth gear 9 drives the rotation of the sixth gear 10, and the power is output through the sixth gear 10. The torque of the second motor 11 is transmitted successively through the seventh gear 12, the rotation of the second gear 8, the rotation of the fifth gear 9, and the sixth gear 10.

[0115] With the above technical solution, when the vehicle speed is low and the battery power is sufficient, the second motor assembly works and outputs power, with high working efficiency and capable of meeting the power requirements for vehicle driving.

[0116] The embodiment of the present disclosure also discloses a control method. In step S3, when the hybrid drive transmission system enters the series mode, the engine assembly works and outputs power to the first motor assembly for the first motor assembly to generate electricity. The first motor assembly works and is in the power generation state. The second motor assembly works and outputs power to the power output assembly. The first brake 19, the second brake 20, and the clutch 21 are disengaged, the planet gears rotate idly, and the engine assembly does not output power to the power output assembly.

[0117] Specifically, in this embodiment, as shown in Table 2, when the hybrid drive transmission system enters the series mode, it also includes two modes: series forward and series reverse.

[0118] Table 2

[0119]

[0120] More specifically, in this embodiment, as shown in Table 2, in the two modes of series forward and series reverse, the engine 1 works but does not output power. The engine 1 transmits the power to the first motor 4, and the first motor 4 generates electricity. The second motor 11 rotates to output power. In the series forward mode, the second motor 11 rotates forward; in the series reverse mode, the second motor 11 rotates in reverse. The power transmission path of the system in this mode is as follows:

[0121] The rotation of the engine 1 drives the rotation of the third gear 5 and the fourth gear 6. The fourth gear 6 drives the first motor 4 to generate electricity and charge the vehicle battery. At this time, the power transmission path of the second motor 11 is the same as that in the pure electric mode. The rotation of the second motor 11 drives the rotation of the seventh gear 12. The rotation of the seventh gear 12 drives the rotation of the second gear 8. The rotation of the second gear 8 drives the rotation of the fifth gear 9. The fifth gear 9 drives the rotation of the sixth gear 10, and the power is output through the sixth gear 10. The torque of the second motor 11 is transmitted successively through the seventh gear 12, the rotation of the second gear 8, the rotation of the fifth gear 9, and the sixth gear 10.

[0122] With the above technical solution, when the vehicle speed is low and the battery power is insufficient, the engine 1 operates but does not output power. When the engine 1 rotates, it drives the first motor 4 to generate electricity and charge the battery, and the second motor 11 operates for power output.

[0123] The embodiment of the present invention also discloses a control method. In step S3, when the hybrid drive transmission system enters the engine direct drive mode, the engine assembly drives the planetary gear set to rotate, and the first motor assembly and the second motor assembly rotate idly, where:

[0124] When the first brake 19 is engaged, and the second brake 20 and the clutch 21 are disengaged, the vehicle is in the first gear of engine direct drive;

[0125] When the second brake 20 is engaged, and the first brake 19 and the clutch 21 are disengaged, the vehicle is in the second gear of engine direct drive;

[0126] When the clutch 21 is engaged, and the first brake 19 and the second brake 20 are disengaged, the vehicle is in the third gear of engine direct drive.

[0127] Specifically, in this embodiment, as shown in Table 3, when the hybrid drive transmission system enters the engine direct drive mode, it includes the first gear of engine direct drive, the second gear of engine direct drive, and the third gear of engine direct drive.

[0128] Table 3

[0129]

[0130] More specifically, in this embodiment, as shown in Table 3, when the system is in the first gear of engine direct drive, the engine 1 starts to operate, the first brake 19 is engaged, the second brake 20 and the clutch 21 are disengaged, and the first motor 4 and the second motor 11 do not operate. At this time, the power transmission path of the system is:

[0131] The rotation of the engine 1 drives the output shaft of the engine 1 to rotate, the output shaft of the engine 1 drives the first sun gear 13 to rotate, the first sun gear 13 drives the first planet gear 14 to rotate, the first planet gear 14 drives the second planet gear 17 to rotate. Since the first brake 19 is engaged, the planet carrier 15 is fixed. At this time, the first planet gear 14 and the second planet gear 17 rotate around the planet carrier 15. The second planet gear 17 drives the ring gear 18 to rotate, the ring gear 18 drives the first gear 7 to rotate, the first gear 7 drives the second gear 8 to rotate, and the second gear 8 drives the fifth gear 9 and the sixth gear 10 to rotate for power transmission. At this time, the second sun gear 16 in the planetary gear set rotates idly.

[0132] When the system is in the engine direct drive second gear, the engine 1 starts to work, the second brake 20 engages, and the first brake 19 and the clutch 21 disengage. At this time, the second sun gear 16 is braked by the second brake 20 and does not rotate, and the first motor 4 and the second motor 11 also do not work. At this time, the power transmission path of the system is as follows:

[0133] The rotation of the engine 1 drives the rotation of the engine 1 output shaft, the engine 1 output shaft drives the rotation of the first sun gear 13, the first sun gear 13 drives the rotation of the first planet gear 14, the first planet gear 14 drives the rotation of the planet carrier 15 and the second planet gear 17. At this time, the second sun gear 16 is fixed and does not rotate, and the second planet gear 17 and the planet carrier 15 rotate around the second sun gear 16. The second planet gear 17 drives the rotation of the ring gear 18, the ring gear 18 drives the rotation of the first gear 7, the first gear 7 drives the rotation of the second gear 8, and the second gear 8 drives the rotation of the fifth gear 9 and the sixth gear 10 to transmit power.

[0134] When the system is in the engine direct drive third gear, the engine 1 starts to work, the clutch 21 engages, and the first brake 19 and the second brake 20 disengage. At this time, the engagement of the clutch 21 makes the rotation shafts of the planet carrier 15 and the second sun gear 16 integrated. At this time, the first motor 4 and the second motor 11 also do not work. At this time, the power transmission path of the system is as follows:

[0135] The rotation of the engine 1 drives the rotation of the engine 1 output shaft, the engine 1 output shaft drives the rotation of the first sun gear 13, the first sun gear 13 drives the rotation of the first planet gear 14, the first planet gear 14 drives the rotation of the planet carrier 15 and the second planet gear 17. Because the rotation shafts of the planet carrier 15 and the second sun gear 16 are integrated at this time, the rotation speeds of the planet carrier 15, the first planet gear 14 and the second sun gear 16 are the same, and they drive the rotation of the second planet gear 17. The second planet gear 17 drives the rotation of the ring gear 18, the ring gear 18 drives the rotation of the first gear 7, the first gear 7 drives the rotation of the second gear 8, and the second gear 8 drives the rotation of the fifth gear 9 and the sixth gear 10 to transmit power.

[0136] More specifically, in this embodiment, if the number of teeth of the first sun gear 13 is Z S1 , the number of teeth of the ring gear 18 is Z r , and the number of teeth of the second sun gear 16 is Z S2 , then the speed ratios of the planetary gear set when the engine is in direct drive at different gears in this transmission system are as follows:

[0137] The speed ratio when the engine is in direct drive first gear is: Z r / Z S2

[0138] The speed ratio when the engine is in direct drive second gear is: Z r *(Z S1 +ZS2 ) / Z S1 *(Z r +Z S2 )

[0139] The speed ratio of the engine direct drive in the third gear is: 1

[0140] With the above technical solution, when the vehicle speed is relatively high and the series efficiency is lower than the engine direct drive efficiency, it enters the engine direct drive mode, and the engine direct drive mode includes three different gears to meet the requirements of different vehicle speeds and different powers. And when the vehicle switches between the first gear of engine direct drive, the second gear of engine direct drive, and the third gear of engine direct drive, it only needs to separately change the state of the first brake 19 being engaged, the second brake 20, or the clutch 21, which is simple and convenient to control, and has high efficiency and quick response.

[0141] The implementation manner of this embodiment also discloses a control method. In step S3, when the hybrid drive transmission system enters the parallel mode, the engine assembly and the planetary gear set rotate and output power; wherein:

[0142] When the first motor assembly and the engine assembly work simultaneously, the vehicle is in the parallel gear of the first motor 4;

[0143] When the second motor assembly and the engine assembly work simultaneously, the vehicle is in the parallel gear of the second motor 11;

[0144] When the first motor assembly, the second motor assembly, and the engine assembly work simultaneously, the vehicle is in the hybrid parallel gear.

[0145] Specifically, in this embodiment, as shown in Table 4, when the hybrid drive transmission system enters the parallel mode, it includes 9 modes in the following table:

[0146] Table 4

[0147]

[0148]

[0149] More specifically, in this embodiment, the parallel mode is to cooperate with the first motor 4 and the second motor 11 according to the driving state of the vehicle in the engine direct drive mode. Modes 8, 9, and 10 in Table 4 are when the vehicle is in the first gear of engine direct drive, and the first motor 4 and the second motor 11 respectively cooperate with the engine 1 to work:

[0150] In mode 8 in Table 4, when the first motor 4 is in the parallel first gear state, the first brake 19 is engaged, the second brake 20 and the clutch 21 are disengaged, the engine 1 works, the first motor 4 cooperates with the engine 1 to work, and the second motor 11 does not work;

[0151] When the second motor 11 is in the parallel first gear state in Table 4, the first brake 19 is engaged, the second brake 20 and the clutch 21 are disengaged, the engine 1 is operating, the second motor 11 cooperates with the engine 1, and the first motor 4 is not operating;

[0152] When the first and second motors are in the parallel first gear state in Mode 10 of Table 4, the first brake 19 is engaged, the second brake 20 and the clutch 21 are disengaged, the engine 1 is operating, and the first motor 4 and the second motor 11 cooperate with the engine 1.

[0153] In Modes 11, 12, and 13 of Table 4, when the engine is directly driving in the second gear, the first motor 4 and the second motor 11 respectively cooperate with the engine 1 to operate:

[0154] When the first motor 4 is in the parallel second gear state in Mode 11 of Table 4, the second brake 20 is engaged, the first brake 19 and the clutch 21 are disengaged, the engine 1 is operating, the first motor 4 cooperates with the engine 1, and the second motor 11 is not operating;

[0155] When the second motor 11 is in the parallel second gear state in Mode 12 of Table 4, the second brake 20 is engaged, the first brake 19 and the clutch 21 are disengaged, the engine 1 is operating, the second motor 11 cooperates with the engine 1, and the first motor 4 is not operating;

[0156] When the first and second motors are in the parallel second gear state in Mode 13 of Table 4, the second brake 20 is engaged, the first brake 19 and the clutch 21 are disengaged, the engine 1 is operating, and the first motor 4 and the second motor 11 cooperate with the engine 1.

[0157] In Modes 14, 15, and 16 of Table 4, when the engine is directly driving in the third gear, the first motor 4 and the second motor 11 respectively cooperate with the engine 1 to operate:

[0158] When the first motor 4 is in the parallel third gear state in Mode 14 of Table 4, the clutch 21 is engaged, the first brake 19 and the second brake 20 are disengaged, the engine 1 is operating, the first motor 4 cooperates with the engine 1, and the second motor 11 is not operating;

[0159] When the second motor 11 is in the parallel third gear state in Mode 15 of Table 4, the clutch 21 is engaged, the first brake 19 and the second brake 20 are disengaged, the engine 1 is operating, the second motor 11 cooperates with the engine 1, and the first motor 4 is not operating;

[0160] When the first and second motors are in the parallel third gear state in Mode 16 of Table 4, the clutch 21 is engaged, the first brake 19 and the second brake 20 are disengaged, the engine 1 is operating, and the first motor 4 and the second motor 11 cooperate with the engine 1.

[0161] More specifically, in this embodiment, both the first motor 4 and the second motor 11 can be driven in parallel or perform energy recovery, realizing the parallel connection of the motors and the engine 1 to adjust the torque of the engine 1 so that it operates in the high-efficiency region and improve the system efficiency. According to the three gears of the planetary gear set, parallel driving in different gears can be achieved respectively. When the battery power is low, the engine 1 can charge the first motor 4, charge the second motor 11, and the second motor 11 can recover braking energy, etc., to increase the battery power. When the vehicle power demand is large, the first motor 4, the second motor 11, and the engine 1 can also output torque simultaneously to improve the vehicle power performance.

[0162] With the above technical solution, in the engine direct drive mode, the first motor 4 and the second motor 11 work in cooperation according to the driving state of the vehicle to adjust the torque of the engine 1 so that it operates in the high-efficiency region and improve the system efficiency. For this system, a total of 16 different modes can be achieved.

[0163] In summary, the present invention discloses a hybrid drive transmission system and a control method. The hybrid drive transmission system includes an engine assembly, a first motor assembly, a second motor assembly, a gear assembly, a planetary gear set, and a power output assembly. A first brake 19, a second brake 20, and a clutch 21 are provided on the planetary gear set. When the system is working, by controlling the first brake 19, the second brake 20, or the clutch 21 to work alone and switch between the engaged state and the disengaged state, the three-gear transformation of the planetary gear set of the hybrid drive transmission system is controlled. The system realizes 3-gear speed change of the planetary gear mechanism through one clutch 21 and two brakes, with a simple structure, convenient control, reduced volume of the transmission system, reduced layout space of the transmission system, improved decoupling degree between the engine 1 and the motor, and improved fuel-saving effect under urban driving conditions and power performance at high vehicle speeds and high loads.

[0164] The control method of the hybrid drive transmission system disclosed by the present invention can control the system to switch between the pure electric mode, the series mode, the engine direct drive mode, and the parallel mode according to the vehicle state information, and can provide 16 modes of switching. By switching between different modes, the defects of a single hybrid mode can be effectively solved, enabling the vehicle to adapt to various driving conditions, improving the efficiency and power performance of the hybrid power system, and solving the problems of low efficiency and weak power performance of hybrid electric vehicles under a single driving condition.

[0165] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in connection with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited only to these descriptions. Those skilled in the art can make various changes in form and detail, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A hybrid drive transmission system, characterized in that, It includes an engine assembly, a first motor assembly, a second motor assembly, a gear assembly, a planetary gear set, and a power output assembly. The engine assembly is drivingly connected to the first motor assembly. The input end of the planetary gear set is connected to the output shaft of the engine assembly. The gear assembly includes a first gear and a second gear that mesh with each other. The first gear is connected to the output end of the planetary gear set. The second gear is connected to the input end of the power output assembly and is drivingly connected to the second motor assembly. The planetary gear set includes a first sun gear, a first planet gear, a planet carrier, a second sun gear, a second planet gear, and a ring gear. The first sun gear is fixedly arranged on the output shaft of the engine assembly. The inner ring of the first planet gear meshes with the first sun gear. The outer ring of the first planet gear meshes with the inner ring of the second planet gear. Both the first planet gear and the second planet gear are arranged on the planet carrier. The outer ring of the second planet gear meshes with the inner ring of the ring gear. The second sun gear is separated and oppositely arranged on one side of the first sun gear. The second sun gear meshes with the inner ring of the second planet gear. A rotating shaft is arranged on the second sun gear. And, The hybrid drive transmission system further includes a first brake, a second brake, and a clutch. The first brake is arranged on the planet carrier and can be switched between a engaged state and a disengaged state with the planet carrier. The second brake is arranged on the rotating shaft of the second sun gear and can be switched between an engaged state and a disengaged state with the rotating shaft. The clutch is arranged between the planet carrier and the rotating shaft and can control the switching between a disengaged state and an engaged state of the planet carrier and the rotating shaft.

2. The hybrid drive transmission system according to claim 1, wherein, The engine assembly includes an engine, a torsional damper, and a one-way brake. The torsional damper and the one-way brake are sequentially arranged on the output shaft of the engine. The output shaft of the engine constitutes the output shaft of the engine assembly.

3. The hybrid drive transmission system according to claim 2, wherein The first gear is integrally formed with the ring gear, and the first gear and the ring gear are rotatably arranged on the output shaft of the engine.

4. The hybrid drive transmission system according to claim 2, wherein The first motor assembly is arranged at a side of the one-way brake and away from the engine. The first motor assembly includes a first motor, a third gear, and a fourth gear. The output shaft of the first motor is connected to the third gear. The third gear meshes with the fourth gear externally. The fourth gear is fixedly arranged on the output shaft of the engine and is located between the one-way brake and the first gear.

5. The hybrid drive transmission system according to claim 4, characterized in that, The power output assembly includes a fifth gear and a sixth gear. The fifth gear is coaxially connected to the second gear. The fifth gear meshes with the sixth gear externally and forms a reduction gear pair. The fifth gear is the input end of the power output assembly, and the sixth gear is the output end of the power output assembly.

6. The hybrid drive transmission system according to claim 5, characterized in that The second motor assembly includes a second motor and a seventh gear. The seventh gear is arranged on the output shaft of the second motor, and the seventh gear meshes with the second gear externally.

7. A control method for a hybrid drive transmission system, characterized in that, Applicable to the hybrid drive transmission system according to any one of claims 1-6, the control method includes the following steps: S1: Obtain the start information of the vehicle, and determine whether the vehicle has started according to the start information of the vehicle; If so, execute step S2; If not, continue to determine whether the vehicle has started; S2: Obtain the status information of the vehicle from the in-vehicle computer of the vehicle, and determine whether the vehicle is currently in a driving state according to the status information of the vehicle; If the vehicle is currently in a driving state, execute step S3; If the vehicle is not currently in a driving state, continue to determine whether the vehicle is currently in a driving state; S3: Obtain the battery status information in the battery management system of the vehicle and the vehicle speed information in the in-vehicle computer, and control the hybrid drive transmission system to enter different working modes according to the comparison results of the battery status information and the vehicle speed information with the preset threshold information. The working modes include pure electric mode, series mode, engine direct drive mode, and parallel mode; wherein, If the battery status information is greater than the first power threshold and the vehicle speed information is less than the first speed threshold, the hybrid drive transmission system enters the pure electric mode; If the battery status information is less than the second power threshold and the vehicle speed information is less than the first speed threshold, the hybrid drive transmission system enters the series mode, wherein the second power threshold is less than the first power threshold; If the battery status information is greater than or equal to the second power threshold and less than or equal to the first power threshold, and the vehicle speed information is greater than the second speed threshold, the hybrid drive transmission system enters the engine direct drive mode, wherein the second speed threshold is greater than the first speed threshold; If the battery status information is greater than or equal to the second power threshold and less than or equal to the first power threshold, and the vehicle speed information is greater than the second speed threshold, and when the in-vehicle computer detects an action of the accelerator pedal or the brake pedal, the hybrid drive transmission system enters the parallel mode.

8. The control method according to claim 7, wherein In step S3, when the hybrid drive transmission system enters the pure electric mode, the engine assembly and the first motor assembly are in a shutdown state, the first brake, the second brake, and the clutch are disengaged, the planet gear idles, and the second motor assembly operates and outputs power.

9. The control method according to claim 7, characterized in that, In step S3, when the hybrid drive transmission system enters the series mode, the engine assembly operates and outputs power to the first motor assembly for the first motor assembly to generate electricity, the first motor assembly operates and is in a power generation state, the second motor assembly operates and outputs power to the power output assembly, the first brake, the second brake, and the clutch are disengaged, the planet gear idles, and the engine assembly does not output power to the power output assembly.

10. The control method according to claim 7, characterized in that In the step S3, when the hybrid drive transmission system enters the engine direct drive mode, the engine assembly drives the planetary gear set to rotate, and the first motor assembly and the second motor assembly rotate idly, where: When the first brake is engaged and the second brake and the clutch are disengaged, the vehicle is in the first gear of engine direct drive; When the second brake is engaged and the first brake and the clutch are disengaged, the vehicle is in the second gear of engine direct drive; When the clutch is engaged and the first brake and the second brake are disengaged, the vehicle is in the third gear of engine direct drive.

11. The control method according to claim 7, wherein, In the step S3, when the hybrid drive transmission system enters the parallel mode, the engine assembly and the planetary gear set rotate and output power; where: When the first motor assembly and the engine assembly work simultaneously, the vehicle is in the first motor parallel gear; When the second motor assembly and the engine assembly work simultaneously, the vehicle is in the second motor parallel gear; When the first motor assembly, the second motor assembly and the engine assembly work simultaneously, the vehicle is in the hybrid parallel gear.

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