A two-speed dual-motor planetary gear power split drive system

Abstract

The present invention relates to the field of vehicle control technology, specifically a two-speed dual-motor planetary gear power split drive system, comprising a first motor, a second motor and an engine, wherein the first motor is connected to the engine through a power split device, and the ring gear output shaft of the power split device is respectively connected to the second motor or the output shaft through a shifting device; the second motor is connected to a parallel shaft reduction device, and is output through the output shaft after two-stage reduction and torque increase; the first motor, the second motor, the engine and the shifting device are respectively connected and controlled by the control device. This system improves the output torque of the drive device under low-speed conditions and the vehicle's dynamics, eliminates power interruption during the shifting process, reduces idling losses of the pure electric transmission system, improves transmission efficiency, reduces rear axle speed ratio requirements, and can match a more efficient and lightweight small speed ratio rear axle.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a two-speed dual-motor planetary gear power split drive system. Background Art

[0002] The dual-motor planetary gear power split technology couples the engine and generator power through the power split planetary gear, which can achieve continuous adjustment of the output speed, that is, stepless speed change. In conjunction with the drive motor, the vehicle can be driven purely electrically when running at low speed, reducing the exhaust emissions of the engine running at low speed and avoiding the engine working at a low efficiency point. At medium speeds, the generator is used to optimize the engine operating speed range, and the generator and drive motor are used to compensate or partially recover the engine output torque, making full use of the engine's efficient working range. Therefore, the dual-motor planetary gear power split technology is becoming more and more widely used.

[0003] However, when the traditional dual-motor planetary gearbox power split solution is applied to large passenger cars or commercial vehicles, due to the split effect of the generator, the torque output by the power split planetary gearbox is always smaller than the engine output torque. In order to meet the torque requirements of heavy-load, low-speed climbing and other working conditions, a larger drive motor can only be selected or a two-speed reduction device can be configured for the drive motor. However, the above solution requires matching a larger capacity drive motor controller, power transmission cable or additional gear pairs, needle bearings, etc., which will significantly increase the cost of the drive device and is not conducive to marketization.

[0004] Therefore, a technology is urgently needed to solve this problem. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of the prior art, and to provide a two-speed dual-motor planetary gear power split drive system. By arranging a shift mechanism on the output shaft of the power split device, the engine power output can be realized in two fixed speed ratio gears without adding an additional gear pair. With the drive motor, the non-power interruption shift can be realized. In the low speed gear, the power of the vehicle in the low-speed climbing condition can be greatly improved, meeting the requirements for commercial vehicle use.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A two-speed dual-motor planetary gear power split drive system comprises a first motor, a second motor and an engine, wherein the first motor is connected to the engine via a power split device, and the ring gear output shaft of the power split device is respectively connected to the second motor or the output shaft via a shifting device; the second motor is connected to a parallel shaft reduction device, and is output through the output shaft after two-stage reduction and torque increase; the first motor, the second motor, the engine and the shifting device are respectively connected and controlled by the control device.

[0008] Furthermore, the power split device includes a sun gear, a planet carrier assembly, an input speed signal tooth and the ring gear output shaft, the first motor is fixedly connected to the sun gear; and the input speed signal tooth is integrated with the ring gear output shaft.

[0009] Furthermore, it also includes a torsional vibration damper, the engine is fixedly connected to the input end of the torsional vibration damper, and the output end of the torsional vibration damper is fixedly connected to the planetary carrier assembly.

[0010] Furthermore, the parallel shaft reduction device includes a primary driving gear, an intermediate shaft and the output shaft, the intermediate shaft is integrated with a primary driven gear and a secondary driving gear, the output shaft is integrated with a secondary driven gear and an output speed signal tooth; the second motor is fixedly connected to the primary driving gear, and the primary driving gear is connected to the shifting device; the primary driving gear can be meshed with the primary driven gear for transmission, and the secondary driving gear can be meshed with the secondary driven gear for transmission.

[0011] Further, the shifting device comprises a gear hub, a gear sleeve, a shift fork, a first gear combining tooth and a second gear combining tooth; the gear hub is fixedly connected to the gear ring output shaft, the first gear combining tooth is fixedly connected to the primary driving gear, and the second gear combining tooth is fixedly connected to the output shaft; the gear sleeve is meshed with the gear hub through a sliding spline to transmit torque, and can slide axially under the push of the shift fork;

[0012] Furthermore, the gear sleeve includes three working positions: left position, middle position and right position;

[0013] When in the left position, the gear sleeve is meshed with the gear hub and the first gear engaging teeth at the same time;

[0014] In the middle position, the gear sleeve is only engaged with the gear hub;

[0015] When in the right position, the gear sleeve is meshed with the gear hub and the second gear combining teeth at the same time.

[0016] Furthermore, the control device includes a hybrid controller, a shift controller, a shift actuator, an input speed sensor and an output speed sensor. The hybrid controller receives an input speed signal through the input speed sensor and receives an output speed signal through the output speed sensor. The shift controller can receive instructions issued by the hybrid controller and control the shift actuator to drive the shift device to perform corresponding work to adjust the driving mode according to the instructions.

[0017] Furthermore, the shift controller may be integrated into the hybrid controller, and the hybrid controller and the shift controller may perform bidirectional communication.

[0018] Further, the shift controller and the shift actuator can perform bidirectional communication; the input speed sensor performs unidirectional communication with the hybrid controller; and the output speed sensor performs unidirectional communication with the hybrid controller.

[0019] Furthermore, the driving modes include a pure electric driving mode, an engine-only driving mode and a hybrid driving mode. Beneficial Effects

[0020] The present invention provides a two-speed dual-motor planetary gear power split drive system, which coordinates and controls the engine, the first motor, the second motor and the shifting device through a control device, so that the drive device has a pure electric drive mode, a hybrid drive mode and an engine-only drive mode, and can realize the engine power output of two fixed speed ratio gears and a neutral function. This system improves the output torque of the drive device under low-speed conditions and the vehicle's dynamics, eliminates power interruption during the shifting process, reduces the idling loss of the pure electric condition transmission system, improves transmission efficiency, reduces the rear axle speed ratio requirement, and can match a more efficient and lightweight small speed ratio rear axle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a two-speed dual-motor planetary gear power split drive system according to the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a control device for a two-speed dual-motor planetary gear power split drive system according to the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of a power split device of a two-speed dual-motor planetary gear power split drive system according to the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a shift device of a two-speed dual-motor planetary gear power split drive system according to the present invention;

[0025] Figure 5 It is a structural schematic diagram of a parallel shaft reduction device of a two-speed dual-motor planetary gear power split drive system according to the present invention;

[0026] Figure 6 A schematic diagram of a power transmission path in a pure electric drive mode of a two-speed dual-motor planetary gear power split drive system according to the present invention;

[0027] Figure 7 A schematic diagram of the power transmission path of the first gear of the engine single drive mode of the two-speed dual-motor planetary gear power split drive system of the present invention;

[0028] Figure 8A schematic diagram of a 2nd gear power transmission path of an engine single drive mode of a 2-speed dual-motor planetary gear power split drive system according to the present invention;

[0029] Fig. 9 A schematic diagram of a power transmission path for the first gear of a hybrid drive mode of a two-speed dual-motor planetary gear power split drive system according to the present invention;

[0030] Fig.10 This is a schematic diagram of the 2nd gear power transmission path of the hybrid drive mode of the two-speed dual-motor planetary gear power split drive system described in the present invention.

[0031] Graphic marking:

[0032] 1-control device, 101-hybrid controller, 102-shift controller, 103-shift actuator, 104-input speed sensor, 105-output speed sensor, 2-torsion damper, 3-engine, 4-first electric motor (EM1), 5-power split device, 501-planet carrier assembly, 502-sun gear, 503-ring gear output shaft, 504-input speed signal tooth, 6-second electric motor (EM2), 7-parallel shaft reduction device, 701-first driving gear, 702-first driven gear, 703-intermediate shaft, 704-secondary driving gear, 705-secondary driven gear, 706-output speed signal tooth, 707-output shaft, 8-shift device, 801-shift fork, 802-first gear engaging tooth, 803-gear hub, 804-gear sleeve, 805-second gear engaging tooth. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below according to the accompanying drawings and embodiments. The described embodiments are only some embodiments of the present invention, not all embodiments. In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "fixed connection", "connection", "coupling" and "integration" should be understood in a broad sense. For example, "fixed connection" can be a welding connection, or it can be connected through an intermediate medium such as a spline. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances. In the embodiments of the present application, it is implied that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0034] like Figure 1As shown, a two-speed dual-motor planetary gear power split drive system includes a first motor 4 (EM1 in the figure), a second motor 6 (EM2 in the figure) and an engine 3, wherein the first motor 4 is connected to the engine 3 via a power split device 5, and the ring gear output shaft 503 of the power split device 5 is respectively connected to the second motor 6 or the output shaft 707 via a shift device 8; the second motor 6 is connected to a parallel shaft reduction device 7, and is output through the output shaft 707 after two-stage reduction and torque increase; the first motor 4, the second motor 6, the engine 3 and the shift device 8 are respectively connected and controlled by the control device 1.

[0035] like Figure 3 As shown, as an optimization of the power split device 5 described in this embodiment, the power split device 5 includes a sun gear 502, a planetary carrier assembly 501, an input speed signal tooth 504 and the ring gear output shaft 503, and the first motor 4 is fixed to the sun gear 502; the input speed signal tooth 504 is integrated in the ring gear output shaft 503.

[0036] It also includes a torsional vibration damper 2 , the engine 3 is fixedly connected to the input end of the torsional vibration damper 2 , and the output end of the torsional vibration damper 2 is fixedly connected to the planet carrier assembly 501 .

[0037] like Figure 5 As shown, as an optimization of the parallel shaft reduction device 7 in this embodiment, the parallel shaft reduction device 7 includes a primary driving gear 701, an intermediate shaft 703 and the output shaft 707, the intermediate shaft 703 is integrated with a primary driven gear 702 and a secondary driving gear 704, the output shaft 707 is integrated with a secondary driven gear 705 and an output speed signal tooth 706; the second motor 6 is fixedly connected to the primary driving gear 701, and the primary driving gear 701 is connected to the shifting device 8; the primary driving gear 701 can be meshed with the primary driven gear 702 for transmission, and the secondary driving gear 704 can be meshed with the secondary driven gear 705 for transmission.

[0038] like Figure 4 As shown, as an optimization of the shifting device 8 in this embodiment, the shifting device 8 includes a gear hub 803, a gear sleeve 804, a shift fork 801, a first gear combining tooth 802 and a second gear combining tooth 805; the gear hub 803 is fixedly connected to the ring gear output shaft 503, the first gear combining tooth 802 is fixedly connected to the primary driving gear 701, and the second gear combining tooth 805 is fixedly connected to the output shaft 707; the gear sleeve 804 is meshed with the gear hub 803 through a sliding spline to transmit torque, and can slide axially under the push of the shift fork 801;

[0039] Specifically, the gear sleeve 804 includes three positions: left position, middle position and right position;

[0040] When in the left position, the gear sleeve 804 can mesh with the gear hub 803 and the first gear engaging tooth 802 at the same time;

[0041] When in the middle position, the gear sleeve 804 can only mesh with the gear hub 803;

[0042] When in the right position, the gear sleeve 804 can mesh with the gear hub 803 and the second gear combining tooth 805 at the same time.

[0043] like Figure 2 As shown, as an optimization of the control device 1 in this embodiment, the control device 1 includes a hybrid controller 101, a shift controller 102, a shift actuator 103, an input speed sensor 104 and an output speed sensor 105. The hybrid controller 101 receives an input speed signal through the input speed sensor 104 and receives an output speed signal through the output speed sensor 105. The shift controller 102 can receive an instruction issued by the hybrid controller 101, and control the shift actuator 103 to drive the shift device 8 to perform corresponding work to adjust the driving mode according to the instruction.

[0044] As an optimization of this embodiment, the shift controller 102 can be integrated into the hybrid controller 101, and the hybrid controller 101 and the shift controller 102 can communicate bidirectionally; the shift controller 102 and the shift actuator 103 can communicate bidirectionally; the input speed sensor 104 communicates unidirectionally with the hybrid controller 101; and the output speed sensor 105 communicates unidirectionally with the hybrid controller 101.

[0045] Working principle: When the hybrid controller 101 detects that the vehicle operation state triggers the shift point, the hybrid controller 101 controls the first motor 4 to reduce the torque of the ring gear output shaft 503 in the power split device 5, and sends a shift disengagement instruction to the shift controller 102. After receiving the shift disengagement instruction, the shift controller 102 controls the shift actuator 103 to drive the shift fork 801 of the shift device 8 to move axially, push the gear sleeve 804 to the middle position, realize the shift disengagement, and send a shift disengagement success signal to the hybrid controller 101;

[0046] After receiving the gear-shift success signal, the hybrid controller 101 controls the first motor 4 to quickly adjust the speed until the speed difference between the ring gear output shaft 503 in the power split device 5 and the target combined gear is less than the critical value. The hybrid controller 101 controls the first motor 4 to reduce the torque of the ring gear output shaft 503 in the power split device 5 and sends a gear shift instruction to the shift controller 102.

[0047] After receiving the gear shift instruction, the gear shift controller 102 controls the gear shift actuator 103 to drive the shift fork 801 of the gear shift device 8 to move axially to achieve gear shifting and sends a gear shifting success signal to the hybrid controller 101. After receiving the gear shifting success signal, the hybrid controller 101 controls the first motor 4 to make the ring gear output shaft 503 in the power split device 5 output torque.

[0048] The input speed sensor 104, the output speed sensor 105, the input speed signal tooth 504, and the output speed signal tooth 706 cooperate to detect the speed difference between the power split device ring gear output shaft 503 and the target coupling tooth during the gear shifting process and assist the hybrid controller 101 in performing speed comparison to determine whether the gear is in place.

[0049] In this embodiment, the driving modes include a pure electric driving mode, an engine-only driving mode, and a hybrid driving mode, specifically including:

[0050] (1) The driving force transmission path of pure electric driving mode is as follows:

[0051] like Figure 6 As shown, the gear sleeve 804 in the shifting device 8 is in the middle position, and the ring gear output shaft 503 in the power splitting device 5 is disconnected from the output shaft 707. The power output by the second motor 6 is transmitted to the primary driven gear 702 on the intermediate shaft 703 through the primary driving gear 701, and then transmitted to the secondary driving gear 704 through the intermediate shaft 703, and the secondary driven gear 705 on the output shaft 707 is driven to operate through the secondary driving gear 704, and then the power is output through the output shaft 707 to drive the vehicle to travel.

[0052] (2) The driving force transmission path of the first gear in the engine single drive mode is as follows:

[0053] like Figure 7 As shown, the gear sleeve 804 of the shifting device 8 is in the left position, and the ring gear output shaft 503 in the power split device 5 is connected to the primary driving gear 701 through the gear hub 803, the gear sleeve 804, and the first gear combination gear 802. At this time, the second motor 6 does not output torque, and only detects that the vehicle is sliding or braking to recover energy. The power output by the engine 3 is transmitted to the ring gear output shaft 503 through the planetary carrier assembly 501 in the power split device 5, and is transmitted to the output shaft 707 through the gear hub 803, the gear sleeve 804, the first gear combination gear 802, the primary driving gear 701, and the intermediate shaft 703, and then outputs power through the output shaft 707 to drive the vehicle to travel. The first motor 4 adjusts the speed of the ring gear output shaft 503 in the power split device 5 to meet the vehicle speed requirement.

[0054] (3) The driving force transmission path of the second gear in the engine single drive mode is as follows:

[0055] like Figure 8As shown, the gear sleeve 804 in the shift device 8 is in the right position, and the ring gear output shaft 503 in the power split device 5 is connected to the output shaft 707 through the gear hub 803, the gear sleeve 804, and the second gear combination gear 805. At this time, the second motor 6 does not output torque, and only detects energy recovery when the vehicle is sliding or braking. The power output by the engine 3 is transmitted to the ring gear output shaft 503 through the planetary carrier assembly 501 in the power split device 5, and is transmitted to the output shaft 707 through the gear hub 803, the gear sleeve 804, and the second gear combination gear 805, and then outputs power through the output shaft 707 to drive the vehicle to travel. The first motor 4 adjusts the speed of the ring gear output shaft 503 in the power split device 5 to meet the vehicle speed requirement.

[0056] (4) The driving force transmission path of the first gear in hybrid driving mode is as follows:

[0057] like Fig. 9 As shown, the gear sleeve 804 in the shift device 8 is in the left position, and the ring gear output shaft 503 in the power split device 5 is connected to the primary driving gear 701 through the gear hub 503, the gear sleeve 804, and the first gear combination tooth 802. The power output by the engine 3 is transmitted to the ring gear output shaft 503 through the planetary carrier assembly 501 in the power split device 5, and is transmitted to the primary driving gear 701 through the gear hub 803, the gear sleeve 804, and the first gear combination tooth 802, and is coupled with the power output by the second motor 6 and transmitted to the output shaft 707 through the intermediate shaft 703, and then the power is output through the output shaft 707 to drive the vehicle to travel. The first motor 4 adjusts the speed of the ring gear output shaft 503 in the power split device 5 to meet the vehicle speed requirement.

[0058] (5) The driving force transmission path of the second gear in hybrid driving mode is as follows:

[0059] like Fig.10 As shown, the gear sleeve 804 in the shift device 8 is in the right position, and the ring gear output shaft 503 in the power split device 5 is connected to the output shaft 707 through the gear hub 803, the gear sleeve 804, and the second gear combination gear 805. The power output by the second motor 6 is transmitted to the primary driven gear 702 on the intermediate shaft 703 through the primary driving gear 701, and then transmitted to the secondary driving gear 704 through the intermediate shaft 703, and the secondary driven gear 705 on the output shaft 707 is driven to operate through the secondary driving gear 704. The power output by the engine 3 is transmitted to the ring gear output shaft 503 through the planetary carrier assembly 501 in the power split device 5, and then transmitted to the output shaft 707 through the gear hub 803, the gear sleeve 804, and the second gear combination gear 805, and then coupled with the power output by the second motor 6 to output power to drive the vehicle to travel. The first motor 4 adjusts the speed of the ring gear output shaft 503 in the power split device 5 to meet the vehicle speed requirement.

[0060] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application are described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A two-speed dual-motor planetary gear power split drive system, characterized in that: The invention comprises a first motor, a second motor and an engine, wherein the first motor is connected to the engine through a power split device, and the ring gear output shaft of the power split device is connected to the second motor or the output shaft through a shift device; the second motor is connected to a parallel shaft reduction device, and the torque is increased through the output shaft after two-stage reduction; the first motor, the second motor, the engine and the shift device are connected and controlled by a control device; The power split device comprises a sun gear, a planet carrier assembly, an input speed signal tooth and the ring gear output shaft, the first motor is fixedly connected to the sun gear; the input speed signal tooth is integrated with the ring gear output shaft; The parallel shaft reduction device comprises a primary driving gear, an intermediate shaft and the output shaft, the intermediate shaft is integrated with a primary driven gear and a secondary driving gear, the output shaft is integrated with a secondary driven gear and an output speed signal tooth; the second motor is fixedly connected to the primary driving gear, and the primary driving gear is connected to the shifting device; the primary driving gear can be meshed with the primary driven gear for transmission, and the secondary driving gear can be meshed with the secondary driven gear for transmission; The shifting device comprises a gear hub, a gear sleeve, a shift fork, a first gear combining tooth and a second gear combining tooth; the gear hub is fixedly connected to the output shaft of the ring gear, the first gear combining tooth is fixedly connected to the primary driving gear, and the second gear combining tooth is fixedly connected to the output shaft; the gear sleeve is meshed with the gear hub through a sliding spline to transmit torque, and can slide axially under the push of the shift fork; The gear sleeve includes three working positions: left position, middle position and right position; When in the left position, the gear sleeve is meshed with the gear hub and the first gear engaging teeth at the same time; In the middle position, the gear sleeve is only engaged with the gear hub; When in the right position, the gear sleeve is meshed with the gear hub and the second gear combining teeth at the same time; Drive modes include: (1) Drive force transmission in pure electric driving mode; the gear sleeve in the shifting device is in the middle position, and the ring gear output shaft in the power splitting device is disconnected from the output shaft; the power output by the second motor is transmitted to the first driven gear on the intermediate shaft through the first driving gear, and then transmitted to the second driving gear through the intermediate shaft, and the second driven gear on the output shaft is driven to rotate through the second driving gear, and then the output shaft outputs power to drive the vehicle to travel; (2) The driving force transmission of the first gear in the engine single drive mode; the gear sleeve in the shift device is in the left position, and the ring gear output shaft in the power split device is connected to the primary driving gear through the gear hub, the gear sleeve, and the first gear combination gear. At this time, the second motor does not output torque, and only recovers energy when the vehicle is detected to be coasting or braking; the power output by the engine is transmitted to the ring gear output shaft through the planetary carrier assembly in the power split device, and is transmitted to the output shaft through the gear hub, the gear sleeve, the first gear combination gear, the primary driving gear, and the intermediate shaft, and then the output shaft outputs power to drive the vehicle to travel; the first motor adjusts the speed of the ring gear output shaft in the power split device to meet the vehicle speed requirement; (3) The second gear driving force transmission in the engine single drive mode; the gear sleeve in the shift device is in the right position, and the ring gear output shaft in the power split device is connected to the output shaft through the gear hub, the gear sleeve, and the second gear combination gear; at this time, the second motor does not output torque, and only recovers energy when the vehicle is detected to be coasting or braking; the power output by the engine is transmitted to the ring gear output shaft through the planetary carrier assembly in the power split device, and is transmitted to the output shaft through the gear hub, the gear sleeve, and the second gear combination gear, and then the output shaft outputs power to drive the vehicle to travel; the first motor adjusts the speed of the ring gear output shaft in the power split device to meet the vehicle speed requirement; (4) Hybrid drive mode 1st gear driving force transmission; the gear sleeve in the shift device is in the left position, and the ring gear output shaft in the power split device is connected to the primary driving gear through the gear hub, the gear sleeve, and the first gear combination gear; the power output by the engine is transmitted to the ring gear output shaft through the planetary carrier assembly in the power split device, and is transmitted to the primary driving gear through the gear hub, the gear sleeve, and the first gear combination gear, and is coupled with the power output by the second motor and transmitted to the output shaft through the intermediate shaft, and then the output shaft outputs power to drive the vehicle to travel; the first motor adjusts the speed of the ring gear output shaft in the power split device to meet the vehicle speed requirement; (5) Hybrid drive mode 2nd gear driving force transmission; the gear sleeve in the shift device is in the right position, and the ring gear output shaft in the power split device is connected to the output shaft through the gear hub, the gear sleeve, and the second gear combination gear; the power output of the second motor is transmitted to the first driven gear on the intermediate shaft through the first driving gear, and then transmitted to the second driving gear through the intermediate shaft, and the second driven gear on the output shaft is driven to rotate through the second driving gear; the power output of the engine is transmitted to the ring gear output shaft through the planetary carrier assembly in the power split device, and then transmitted to the output shaft through the gear hub, the gear sleeve, and the second gear combination gear, and then coupled with the power output of the second motor to output power to drive the vehicle to travel; the first motor adjusts the speed of the ring gear output shaft in the power split device to meet the vehicle speed requirement.

2. A two-speed dual-motor planetary gear power split drive system according to claim 1, characterized in that: It also includes a torsional vibration damper, wherein the engine is fixedly connected to the input end of the torsional vibration damper, and the output end of the torsional vibration damper is fixedly connected to the planet carrier assembly.

3. The two-speed dual-motor planetary gear power split drive system according to claim 1, characterized in that: The control device includes a hybrid controller, a shift controller, a shift actuator, an input speed sensor and an output speed sensor. The hybrid controller receives an input speed signal through the input speed sensor and receives an output speed signal through the output speed sensor. The shift controller can receive instructions issued by the hybrid controller and control the shift actuator to drive the shift device to perform corresponding work to adjust the driving mode according to the instructions.

4. A two-speed dual-motor planetary gear power split drive system according to claim 3, characterized in that: The shift controller may be integrated into the hybrid controller, and the hybrid controller and the shift controller may perform bidirectional communication.

5. The two-speed dual-motor planetary gear power split drive system according to claim 3, characterized in that: The shift controller and the shift actuator can perform bidirectional communication; the input speed sensor performs unidirectional communication with the hybrid controller; and the output speed sensor performs unidirectional communication with the hybrid controller.

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