Three-planet-row dual-mode hybrid power transmission device

Abstract

The invention provides a three-planet-row dual-mode hybrid power transmission device, which relates to the technical field of hybrid electric vehicles, and comprises an input shaft, an output shaft, a planet gear assembly and a torque transmission device, the first planet carrier is fixedly connected with the second planet carrier, the first sun gear is fixedly connected with the second sun gear, and the second gear ring is fixedly connected with the third planet carrier. A first clutch in the torque transmission device is connected with an input shaft and a first gear ring, a second clutch is connected with first and third gear rings, a third clutch is connected with second and third sun gears, and a brake is connected with the third gear ring; the input shaft is connected with the first planet carrier; the first gear ring is connected with a first motor; the third planet carrier is connected with a second motor; the output shaft is connected with a third sun gear; the clutch and the brake are selectively engaged to adjust the output mode. The invention has the following beneficial effects: efficient power transmission in a wide speed ratio range is realized through dual-mode control and a multi-gear speed change strategy; control is simple, and mode or gear switching is smooth.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid electric vehicles, and in particular to a three-planetary gear dual-mode hybrid electric transmission device. Background Art

[0002] The power-split hybrid system has been widely used in both passenger cars and commercial vehicles because of its decoupling characteristics between the motor and the engine, which significantly improves the power and economy of the vehicle while achieving continuously variable speed control.

[0003] Traditional power split systems typically employ a single-mode control strategy. While this strategy covers some typical operating conditions, it struggles to meet the performance and efficiency demands of modern vehicles across all operating conditions. To address this, a dual-mode power split architecture has been proposed. By introducing multiple operating modes and fixed gears, the system offers greater flexibility and efficiency. In particular, the inclusion of multiple overdrive gears makes the system more suitable for high-speed cruising, helping to further reduce engine speed and improve fuel economy.

[0004] Theoretically, a three-planet gearbox dual-mode system offers a wider range of transmission modes and speed ratios, but its control logic and coordination strategy with the actuators (clutches and brakes) are complex. Optimizing efficient coordinated control of the actuators, improving energy diversion paths, and reducing shift shock, all while maintaining a compact structure and manageable costs, remain key technical challenges that require breakthroughs. Summary of the Invention

[0005] In view of this, in order to solve the above-mentioned problems existing in the three-planet gear dual-mode system, an embodiment of the present invention provides a three-planet gear dual-mode hybrid power transmission device.

[0006] An embodiment of the present invention provides a three-planetary-row dual-mode hybrid power transmission device, comprising an input shaft, an output shaft, a planetary gear assembly, and a torque transmission device; The planetary gear assembly includes a first planetary gear row, a second planetary gear row, and a third planetary gear row arranged in sequence from front to back, the first planetary gear row includes a first ring gear, a first planetary gear, a first planetary carrier, and a first sun gear, the second planetary gear row includes a second ring gear, a second planetary gear, a second planetary carrier, and a second sun gear, the third planetary gear row includes a third ring gear, a third planetary gear, a third planetary carrier, and a third sun gear, the first planetary carrier is fixedly connected to the second planetary carrier, the first sun gear is fixedly connected to the second sun gear, and the second ring gear is fixedly connected to the third planetary carrier; The torque transmission device includes a first clutch, a second clutch, a third clutch and a brake, the first clutch connecting the input shaft and the first ring gear, the second clutch connecting the first ring gear and the third ring gear, the third clutch connecting the second sun gear and the third sun gear, and the brake connecting the third ring gear; One end of the input shaft is connected to the first planet carrier, and the other end is used to connect to the engine; The first ring gear is used to connect to the first motor; The third planet carrier is used to connect to the second motor; The output shaft is connected to the third sun gear; The first clutch, the second clutch, the third clutch, and the brake are selectively engaged to adjust a power output mode of the transmission.

[0007] Furthermore, it also includes an engine, a first motor and a second motor, the engine is connected to the input shaft, the first motor is connected to the first ring gear, and the second motor is connected to the third planetary carrier.

[0008] Furthermore, the brake is engaged, the second motor is started, and the output shaft outputs in a pure electric mode.

[0009] Furthermore, the brake is engaged, the engine, the first motor, and the second motor are started, and the output shaft outputs in an input-split mode.

[0010] Furthermore, the third clutch is engaged, the engine, the first motor, and the second motor are started, and the output shaft outputs in a compound-split mode.

[0011] Furthermore, only the engine is started, and four fixed gear modes are achieved by controlling the working states of the clutch and the brake.

[0012] Furthermore, the four fixed gear modes are as follows: First gear operating mode: the brake and the second clutch are engaged to establish a first reduction gear ratio between the input shaft and the output shaft; Second gear operating mode: the second clutch and the third clutch are engaged to establish a second direct gear transmission ratio between the input shaft and the output shaft; Third gear operating mode: the brake and the third clutch are engaged to establish a third overdrive gear ratio between the input shaft and the output shaft; Fourth gear operating mode: the brake and the first clutch are engaged to establish a fourth overdrive gear ratio between the input shaft and the output shaft.

[0013] Furthermore, the brake is engaged, and only the second motor is started to rotate in reverse, thereby establishing reverse gear.

[0014] Furthermore, it also includes a housing, the planetary gear assembly and the torque transmission device are both arranged in the housing, and the brake is fixedly connected to the housing.

[0015] Furthermore, the first clutch, the second clutch and the third clutch are multi-plate wet clutches or dog clutches, and the brake is a drum brake or a multi-plate wet brake.

[0016] The beneficial effects brought about by the technical solution provided by the embodiments of the present invention are: 1. The present invention relates to a three-planetary-row dual-mode hybrid transmission device, wherein the planetary gear assembly comprises three planetary gear rows arranged in a front-to-rear direction. By selectively engaging a first clutch, a second clutch, a third clutch, and a brake, the transmission device's power output mode can be adjusted to include a pure electric mode, an input-split mode, a compound-split mode, and four fixed-gear modes. The input-split mode and the compound-split mode respectively accommodate the vehicle's low-speed and high-speed driving requirements. The four fixed-gear modes (including two overdrive gears) meet the vehicle's operating requirements when no electric power is engaged. The two overdrive gears effectively reduce the engine's cruising speed, broadening its economical speed range, thereby enhancing the vehicle's high-speed, energy-saving performance. The present invention combines dual-mode control with a multi-speed shifting strategy to achieve efficient power transmission across a wide speed ratio range, making it particularly suitable for multi-operating hybrid vehicle applications.

[0017] 2. In the three-planetary gear dual-mode hybrid transmission of the present invention, only one torque transfer member (clutch or brake) needs to be engaged in the pure electric mode, input split mode, and compound split mode, while only two torque transfer members (clutches or brakes) need to be engaged in the four fixed gear modes. Switching modes or gears only requires replacing one torque transfer member. The coordination strategy between the control logic and the actuator is simple, and mode or gear switching is smooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a transmission principle diagram of a three-planetary gear dual-mode hybrid power transmission device of the present invention; Figure 2 This is a working logic diagram of a three-planetary gear dual-mode hybrid power transmission device of the present invention.

[0019] In the figure: 1. Engine; 2. First motor; 3. Second motor; 4. Output shaft; 5. First ring gear; 6. First planetary gear; 7. First planetary carrier; 8. First sun gear; 9. Second ring gear; 10. Second planetary gear; 11. Second planetary carrier; 12. Second sun gear; 13. Third ring gear; 14. Third planetary gear; 15. Third planetary carrier; 16. Third sun gear; 17. Input shaft; 18. Housing; B1. Brake; C1. First clutch; C2. Second clutch; C3. Third clutch. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the present invention more apparent, embodiments of the present invention will be further described below with reference to the accompanying drawings. The following describes a preferred embodiment of the present invention among multiple possible embodiments, which is intended to provide a basic understanding of the present invention but is not intended to identify the key or decisive elements of the present invention or to limit the scope of protection.

[0021] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0022] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0023] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual scale.

[0024] It should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0025] Please refer to Figure 1 The embodiment of the present invention provides a three-planetary gear dual-mode hybrid power transmission device, which is applied to hybrid vehicles and mainly includes an input shaft 17, an output shaft 4, a planetary gear assembly and a torque transmission device.

[0026] The planetary gear assembly includes a first planetary gear row, a second planetary gear row, and a third planetary gear row arranged in sequence from front to back. Each planetary gear row is composed of a sun gear, a planet carrier, planetary gears, and a ring gear. Specifically: The first planetary gear row includes a first ring gear 5, a first planetary gear 6, a first planetary carrier 7 and a first sun gear 8. The first sun gear 8 and the first planetary gear 6 are externally meshed for transmission, the first planetary gear 6 and the first ring gear 5 are internally meshed for transmission, and the first planetary gear 6 is rotatably mounted on the first planetary carrier 7.

[0027] The second planetary gear train includes a second ring gear 9, second planetary gears 10, a second planetary carrier 11, and a second sun gear 12. The second sun gear 12 and the second planetary gears 10 are externally meshed for transmission, while the second planetary gears 10 and the second ring gear 9 are internally meshed for transmission. The second planetary gears 10 are rotatably mounted on the second planetary carrier 11. Furthermore, the first planetary carrier 7 is fixedly connected to the second planetary carrier 11, and the first planetary carrier 7 and the second planetary carrier 11 rotate together. The first sun gear 8 is fixedly connected to the second sun gear 12, and the first sun gear 8 and the second sun gear 12 rotate together.

[0028] The third planetary gear row includes a third ring gear 13, third planetary gears 14, a third planet carrier 15, and a third sun gear 16. The third sun gear 16 and the third planetary gears 14 are externally meshed, while the third planetary gears 14 and the third ring gear 15 are internally meshed. The third planetary gears 14 are rotatably mounted on the third planet carrier 15. The second ring gear 9 is fixedly connected to the third planet carrier 15, and the second ring gear 9 rotates together with the third planet carrier 15.

[0029] The torque transmission device includes a first clutch C1, a second clutch C2, a third clutch C3, and a brake B1. The first clutch C1 connects the input shaft 17 and the first ring gear 5. Engaging the first clutch C1 allows the input shaft 17 and the first ring gear 5 to rotate together. The second clutch C2 connects the first ring gear 5 and the third ring gear 13. Engaging the second clutch C2 allows the first and third ring gears 13 to rotate together. The third clutch C3 connects the second sun gear 12 and the third sun gear 16. Engaging the third clutch C3 allows the second and third sun gears 12 and 16 to rotate together. The brake B1 connects the third ring gear 13. Engaging the brake B1 fixes the third ring gear 13, preventing it from rotating.

[0030] In this embodiment, the first clutch C1, the second clutch C2, and the third clutch C3 are multi-plate wet clutches or dog clutches, and the brake B1 is a drum brake or a multi-plate wet brake. It will be appreciated that the first clutch C1, the second clutch C2, and the third clutch C3 may also be other types of clutches, and the brake B1 may also be other types of brakes, depending on actual application needs.

[0031] Generally, a three-planetary gear dual-mode hybrid power transmission device of the present invention further includes a housing 18 , the planetary gear assembly and the torque transmission device are both disposed in the housing 18 , and the brake B1 is fixedly connected to the housing 18 .

[0032] One end of the input shaft 17 is connected to the first planetary carrier 7, and the other end is used to connect to the engine 1. The engine 1 can drive the input shaft 17 to drive the first planetary carrier 7 to rotate. The first ring gear 5 is used to connect to the first motor 2, and the first motor 2 can drive the first ring gear 5 to rotate. The third planetary carrier 15 is used to connect to the second motor 3, and the second motor 3 can drive the third planetary carrier 15 to rotate. The output shaft 4 is connected to the third sun gear 16, and the rotation of the third sun gear 16 can drive the output shaft 4 to rotate. In actual application, at least one of the engine 1, the first motor 2 and the second motor 3 inputs power, and the output shaft 4 can output power to the vehicle to drive the vehicle to move.

[0033] The first clutch C1 , the second clutch C2 , the third clutch C3 , and the brake B1 are selectively engaged to adjust a power output mode of the transmission.

[0034] When a three-planetary gear dual-mode hybrid transmission device of the present invention is applied to a hybrid vehicle, it generally includes an engine 1, a first motor 2, and a second motor 3. The engine 1 is connected to the input shaft 17, the first motor 2 is connected to the first ring gear 5, and the second motor 3 is connected to the third planetary carrier 15. Figure 2 As shown, the first clutch C1, the second clutch C2, the third clutch C3 and the brake B1 are selectively engaged to cooperate with the partial or full power output of the engine 1, the first motor 2 and the second motor 3 to achieve different modes of power output, as follows: Pure Electric Mode: Brake B1 is engaged, second motor 3 is activated, and output shaft 4 operates in pure electric mode. Specifically, engagement of brake B1 immobilizes third ring gear 13, preventing it from rotating. Second motor 3 drives third planetary carrier 15 to rotate, driving the third planetary gear set. Rotating third sun gear 16 drives output shaft 4, driving the vehicle.

[0035] Input-split type: When brake B1 is engaged, the engine 1, the first motor 2, and the second motor 3 are started, and the output shaft 4 operates in an input-split mode. Specifically, engaging brake B1 immobilizes the third ring gear 13, preventing it from rotating. The engine 1 drives the first planetary carrier 7, which in turn drives the first planetary gear set. A portion of the power is transferred from the first planetary carrier 7 to the second planetary carrier 11. The first sun gear 8 then transfers power to the second sun gear 12, driving the second planetary gear set. The second ring gear 9 then drives the third planetary carrier 15, rotating the third planetary gear set. The third sun gear 16 rotates, driving the output shaft 4. Another portion of the power is transferred from the first ring gear 5 to the first motor 2, driving the first motor 2 to rotate and converting it into electrical energy. The electrical energy then drives the second motor 3 to rotate the third planetary carrier 15, rotating the third planetary gear set. The third sun gear 16 rotates, driving the output shaft 4. The input-split type power split occurs between the first and second planetary gear sets and is suitable for vehicle starting and low-speed driving.

[0036] Compound-split mode: The third clutch C3 is engaged, the engine 1, the first motor 2, and the second motor 3 are started, and the output shaft 4 operates in compound-split mode. Specifically, the third clutch C3 connects the second sun gear 12 and the third sun gear 16. Engaging the third clutch C3 allows the second sun gear 12 and the third sun gear 16 to rotate together. The engine 1 drives the first planetary carrier 7 to rotate, driving the first planetary gear set. A portion of the power from the first planetary carrier 7 is transferred to the second planetary carrier 11. The first sun gear 8 is then transferred to the second sun gear 12, driving the second planetary gear set. The second ring gear 9 then drives the third planetary carrier 15 to rotate, causing the third planetary gear set to rotate. The third sun gear 16 rotates, thereby driving the output shaft 4. A portion of the power from the second sun gear 12 is transferred to the third sun gear 16, which rotates and drives the output shaft 4. Another portion of the power is transferred to the first motor 2 through the first ring gear 5, driving the first motor 2 to rotate and convert it into electrical energy. The electrical energy then drives the second motor 3 to rotate the third planetary carrier 15, driving the third planetary gear set. The third sun gear 16 rotates and drives the output shaft 4. The compound-split mode is suitable for vehicles traveling at medium and high speeds.

[0037] In addition, the three-planetary gear dual-mode hybrid transmission device of the present invention can also start only the engine 1 and realize four fixed gear modes by controlling the working state of the clutch and brake B1. The four fixed gear modes are as follows: First Gear Operating Mode: The brake B1 and the second clutch C2 are engaged to establish a first reduction gear ratio between the input shaft 17 and the output shaft 4. Specifically, the engagement of the brake B1 immobilizes the third ring gear 13, preventing it from rotating. The engagement of the second clutch C2 causes the first ring gear 5 and the third ring gear 13 to rotate together. The engine 1 drives the first planetary carrier 7 to rotate, driving the first planetary gear set. The first planetary carrier 7 drives the second planetary carrier 11 to rotate, and the first sun gear 8 drives the second sun gear 12 to rotate, driving the second planetary gear set. The second ring gear 9 drives the third planetary carrier 15 to rotate, driving the third planetary gear set. The rotation of the third sun gear 16 drives the output shaft 4, establishing a first reduction gear ratio between the input shaft 17 and the output shaft 4. First gear is a reduction gear.

[0038] Second gear operating mode: The second clutch C2 and the third clutch C3 are engaged to establish a second direct gear ratio between the input shaft 17 and the output shaft 4. Specifically, the engagement of the second clutch C2 causes the first ring gear 5 and the third ring gear 13 to rotate together. The engagement of the third clutch C3 causes the second sun gear 12 and the third sun gear 16 to rotate together. The engine 1 drives the first planetary carrier 7 to rotate, driving the first planetary gear row to operate. The first planetary carrier 7 drives the second planetary carrier 11 to rotate, and the first sun gear 8 drives the second sun gear 12 to rotate, causing the second planetary gear row to operate. The second ring gear 9 drives the third planetary carrier 15 to rotate, causing the third planetary gear row to operate. The third sun gear 16 rotates to drive the output shaft 4 to rotate; at the same time, the operation of the first planetary gear row causes the first ring gear 5 to drive the third ring gear 13 to rotate, causing the third planetary gear row to operate, and the third sun gear 16 rotates to drive the output shaft 4 to rotate; and the rotation of the second sun gear 12 drives the third sun gear 16 to rotate, driving the output shaft 4 to rotate; thereby, a second direct gear transmission ratio is established between the input shaft 17 and the output shaft 4, and the second gear is a direct gear.

[0039] Third gear operating mode: The brake B1 and the third clutch C3 are engaged to establish a third overdrive gear ratio between the input shaft 17 and the output shaft 4. Specifically, the engagement of the brake B1 immobilizes the third ring gear 13, preventing it from rotating. The engagement of the third clutch C3 causes the second sun gear 12 and the third sun gear 16 to rotate together. The engine 1 drives the first planetary carrier 7 to rotate, driving the first planetary gear set. The first planetary carrier 7 drives the second planetary carrier 11 to rotate, and the first sun gear 8 drives the second sun gear 12 to rotate, driving the second planetary gear set. The second ring gear 9 drives the third planetary carrier 15 to rotate, driving the third planetary gear set. The third sun gear 16 rotates, driving the output shaft 4. Furthermore, the rotation of the second sun gear 12 drives the third sun gear 16 to rotate, driving the output shaft 4. Thus, a third overdrive gear ratio is established between the input shaft 17 and the output shaft 4, making third gear an overdrive gear.

[0040] Fourth gear operating mode: The brake B1 and the first clutch C1 are engaged to establish a fourth overdrive gear ratio between the input shaft 17 and the output shaft 4. Specifically, the engagement of the brake B1 immobilizes the third ring gear 13, preventing it from rotating. The engagement of the first clutch C1 causes the input shaft 17 and the first ring gear 5 to rotate together. The engine 1 drives the first planetary carrier 7 and the first ring gear 5 to rotate, respectively, driving the first planetary gear set. The first planetary carrier 7 drives the second planetary carrier 11 to rotate, and the first sun gear 8 drives the second sun gear 12 to rotate, driving the second planetary gear set. The second ring gear 9 drives the third planetary carrier 15 to rotate, driving the third planetary gear set. The rotation of the third sun gear 16 drives the output shaft 4, thereby establishing a fourth overdrive gear ratio between the input shaft 17 and the output shaft 4. Fourth gear is an overdrive gear.

[0041] It should be noted that in the three-planetary gear dual-mode hybrid transmission device of the present invention, only one torque transfer component (clutch or brake) needs to be engaged in the pure electric mode, input split mode and compound split mode, while only two torque transfer components (clutches or brakes) need to be engaged in the four fixed gear modes. Switching modes or gears only requires replacing one torque transfer component. The coordination strategy of the control logic and the actuator is simple, and the mode or gear switching is smooth.

[0042] Finally, considering the issue of reversing, the three-planetary gear dual-mode hybrid transmission of the present invention can also engage brake B1 to activate only the second motor 3 in reverse rotation, establishing reverse gear. Specifically, engagement of brake B1 immobilizes the third ring gear 13, preventing it from rotating. The second motor 3 then reverses, driving the third planetary carrier 15 to rotate, causing the third planetary gear set to operate. The rotation of the third sun gear 16, in turn, drives the output shaft 4, thereby establishing reverse gear and enabling the vehicle to reverse.

[0043] In this document, directional terms such as front, back, top, and bottom are defined based on the positions of components in the accompanying drawings and relative to each other, and are intended for clarity and convenience in describing the technical solution. It should be understood that these terms are relative and may vary depending on usage and placement. The use of these directional terms should not limit the scope of protection claimed in this application.

[0044] The above embodiments and features of the embodiments may be combined with each other unless they conflict. The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A three-planetary gear dual-mode hybrid power transmission device, characterized by: including an input shaft, an output shaft, a planetary gear assembly, and a torque transmitting device; The planetary gear assembly includes a first planetary gear row, a second planetary gear row, and a third planetary gear row arranged in sequence from front to back, the first planetary gear row includes a first ring gear, a first planetary gear, a first planetary carrier, and a first sun gear, the second planetary gear row includes a second ring gear, a second planetary gear, a second planetary carrier, and a second sun gear, the third planetary gear row includes a third ring gear, a third planetary gear, a third planetary carrier, and a third sun gear, the first planetary carrier is fixedly connected to the second planetary carrier, the first sun gear is fixedly connected to the second sun gear, and the second ring gear is fixedly connected to the third planetary carrier; The torque transmission device includes a first clutch, a second clutch, a third clutch and a brake, the first clutch connecting the input shaft and the first ring gear, the second clutch connecting the first ring gear and the third ring gear, the third clutch connecting the second sun gear and the third sun gear, and the brake connecting the third ring gear; One end of the input shaft is connected to the first planet carrier, and the other end is used to connect to the engine; The first ring gear is used to connect to the first motor; The third planet carrier is used to connect to the second motor; The output shaft is connected to the third sun gear; The first clutch, the second clutch, the third clutch, and the brake are selectively engaged to adjust a power output mode of the transmission.

2. The three-planetary gear dual-mode hybrid power transmission device according to claim 1, characterized in that: The system further includes an engine, a first motor and a second motor, wherein the engine is connected to the input shaft, the first motor is connected to the first ring gear, and the second motor is connected to the third planetary carrier.

3. The three-planetary gear dual-mode hybrid power transmission device according to claim 2, characterized in that: The brake is engaged, the second motor is started, and the output shaft outputs in a pure electric mode.

4. The three-planetary gear dual-mode hybrid power transmission device according to claim 2, characterized in that: The brake is engaged, the engine, the first electric machine, and the second electric machine are started, and the output shaft outputs in an input-split mode.

5. The three-planetary gear dual-mode hybrid power transmission device according to claim 2, characterized in that: The third clutch is engaged, the engine, the first and second electric machines are started, and the output shaft outputs in a compound-split mode.

6. The three-planetary gear dual-mode hybrid power transmission device according to claim 2, characterized in that: Only the engine is started, and four fixed gear modes are achieved by controlling the working states of the clutch and the brake.

7. The three-planetary gear dual-mode hybrid power transmission device according to claim 6, characterized in that: The four fixed gear modes are as follows: First gear operating mode: the brake and the second clutch are engaged to establish a first reduction gear ratio between the input shaft and the output shaft; Second gear operating mode: the second clutch and the third clutch are engaged to establish a second direct gear transmission ratio between the input shaft and the output shaft; Third gear operating mode: the brake and the third clutch are engaged to establish a third overdrive gear ratio between the input shaft and the output shaft; Fourth gear operating mode: the brake and the first clutch are engaged to establish a fourth overdrive gear ratio between the input shaft and the output shaft.

8. The three-planetary gear dual-mode hybrid power transmission device according to claim 2, characterized in that: The brake is engaged, and only the second motor is started to rotate in reverse, establishing reverse gear.

9. The three-planetary gear dual-mode hybrid power transmission device according to claim 1, characterized in that: It also includes a housing, the planetary gear assembly and the torque transmission device are both arranged in the housing, and the brake is fixedly connected to the housing.

10. The three-planetary gear dual-mode hybrid power transmission device according to claim 1, characterized in that: The first clutch, the second clutch and the third clutch are multi-plate wet clutches or dog clutches, and the brake is a drum brake or a multi-plate wet brake.

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