Twin-motor multi-stage hybrid powertrain system and vehicle

Abstract

The present application discloses a twin-motor multi-stage hybrid powertrain system and a vehicle. The twin-motor multi-stage hybrid powertrain system includes an engine (11), a first motor (12), a second motor (13), a first clutch (21), a second clutch (22), a first planetary gear mechanism (60), a second planetary gear mechanism (70), a first input shaft (31), a second input shaft (32), a third input shaft (33), and a brake assembly, the first input shaft is connected to the engine via the first clutch, the second input shaft is connected to the engine via the second clutch, the second input shaft is idly rotatably disposed outside the first input shaft, the first motor is connected to the engine, the second motor is connected to the first planetary gear mechanism via the third input shaft, and the brake assembly is arranged to brake the first planetary gear mechanism and / or the second planetary gear mechanism. The speed ratio of the powertrain system can be flexibly adjusted according to different driving modes, optimizing economy without compromising performance and allowing the engine to work at an optimal operating point. This application also discloses a vehicle including the powertrain system.

Description

[Technical field]

[0001] This application claims priority to Chinese Patent Application No. 202110905044.9, filed on August 5, 2021, the entire contents of which are incorporated by reference.

[0002] The present application relates to the technical field of vehicles, and in particular to a twin-motor multi-stage hybrid powertrain system and a vehicle. [Background technology]

[0003] Traditional fuel-powered vehicles consume non-renewable resources and cause serious environmental pollution, and current pure electric vehicles have a bottleneck in battery technology, so hybrid vehicles have gradually become the mainstream in automobile development due to their practicality and environmental protection. A hybrid is a vehicle that uses both gasoline and electric power, and the key to this is the hybrid system, and the performance of the hybrid system is directly linked to the performance of the hybrid vehicle.

[0004] Currently, hybrid systems commonly used often employ a fixed speed ratio, but this makes it difficult for the engine to operate economically and also limits power transmission performance. Summary of the Invention [Problem to be solved by the invention]

[0005] The main objective of the present application is to provide a twin-motor multi-stage hybrid powertrain system, which aims to solve the problem of fixed speed ratio of the hybrid powertrain system and improve the power transmission performance. [Means for solving the problem]

[0006] In order to achieve the above object, the present application provides a twin-motor multi-stage hybrid powertrain system, comprising an engine, a first motor, a second motor, a first clutch, a second clutch, a first planetary gear mechanism, a second planetary gear mechanism, a first input shaft, a second input shaft, a third input shaft, and a brake assembly; the first input shaft is connected to an engine via the first clutch; the second input shaft is connected to an engine via the second clutch, and the second input shaft is idly rotatably disposed outside the first input shaft, the first motor is coupled to the engine; the second motor is connected to the first planetary gear mechanism via the third input shaft; The brake assembly is positioned to brake the first planetary gear set and / or the second planetary gear set.

[0007] In one embodiment, the first planetary gear mechanism includes a first sun gear, a first planetary carrier, a first planetary gear, and a first ring gear, and the second planetary gear mechanism includes a second sun gear, a second planetary carrier, a second planetary gear, and a second ring gear, the first planetary carrier being connected to the second ring gear, and the second planetary carrier being connected to the first ring gear.

[0008] In one embodiment, the brake assembly includes a first brake coupled to the second planetary carrier.

[0009] In one embodiment, the brake assembly includes a second brake coupled to the second sun gear.

[0010] In one embodiment, the twin motor multi-stage hybrid powertrain system is idly rotatably mounted on the outside of the first input shaft and further includes a first intermediate shaft, and the second brake is connected to the second sun gear via the first input shaft.

[0011] In one embodiment, the twin motor multi-stage hybrid powertrain system further includes a second intermediate shaft coupled to the second ring gear and positioned to output power.

[0012] In one embodiment, the twin motor multi-stage hybrid powertrain system further includes a differential coupled to the second intermediate shaft.

[0013] In one embodiment, the twin motor multi-stage hybrid powertrain system further includes a torsional vibration damper disposed between the engine and the first motor.

[0014] In one embodiment, a twin motor multi-stage hybrid powertrain system has both the first motor and the second motor connected to a motive battery and has any one or more of the following operating modes: Pure electric mode: the second motor operates as a traction motor using the electric energy of the power battery, the engine is not operating, and the first motor is not operating. Series mode: The second motor operates as a drive motor using the electrical energy of the power battery, and the engine drives the first motor as a generator, supplying power to the second motor or charging the power battery under a set, predetermined operating condition. Parallel mode: the engine operates at a set economical operating point, the second motor provides power output or charges the power battery depending on the current power demand or the power demand of the power battery, and the first motor is not operating. Power Split Mode: The second motor operates as a drive motor by utilizing the electric energy of the power battery, and while the engine is operating, the engine drives the first motor as a generator to generate electricity and supply it to the second motor, or The second motor operates as a drive motor using the electric energy of the power battery, and while the engine is operating, the first motor operates as a drive motor using the electric energy of the power battery.

[0015] The present application also proposes a vehicle including a twin motor multi-stage hybrid powertrain system.

[0016] In one embodiment of the present invention, a twin clutch is used to couple two input shafts coupled to a socket, a first clutch is coupled to the engine via the first input shaft, and a second clutch is coupled to the engine via the second input shaft, thereby realizing the transmission of engine power by the two input shafts and further to the first planetary gear mechanism and / or the second planetary gear mechanism. The coupling of the second motor and the first planetary gear mechanism realizes the transmission of the power of the second motor to the first planetary gear mechanism. Furthermore, the transmission of power in the first planetary gear mechanism and / or the second planetary gear mechanism is controlled by a brake assembly, and at the same time, the engine is coupled to the first motor to transmit the power of the engine to the first motor, thereby realizing modes such as a pure electric mode, a series mode, a parallel mode, a power split mode, and other driving modes. Compared with existing hybrid powertrain systems, the problem of a fixed speed ratio is solved. According to various driving modes, the speed ratio of the twin-motor multi-stage hybrid powertrain system may be flexibly adjusted, and the economy may be optimized without reducing performance, and the engine may be made to work at an optimal operating point, thus improving the power transmission performance while making the engine operate more economically and improving the transmission efficiency. In addition, both the first motor and the second motor have driving capabilities, and under the premise of reducing the performance of the second motor, the performance of the first motor may be improved to reduce costs, while in the twin-motor driving mode, the engine may flexibly transition to series mode to supply energy to the twin motors, thereby enhancing the driving force of the vehicle. In order to more clearly show the embodiments of the present application or aspects in the prior art, the following briefly introduces the drawings that need to be used in the description of the embodiments or prior art. Obviously, the following description is merely some embodiments of the present application, and those skilled in the art may obtain other drawings according to the structures shown in these drawings without creative efforts. The realization of the objectives, functional features and advantages of the present application will be further explained with reference to the examples and the accompanying drawings. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic configuration diagram of a twin-motor multi-stage hybrid powertrain system according to a first embodiment of the present invention. [Diagram 2] FIG. 11 is a schematic configuration diagram of a twin-motor multi-stage hybrid powertrain system according to a second embodiment of the present invention. [Diagram 3] FIG. 2 is a power path diagram of the pure electric mode one stage of the twin-motor multi-stage hybrid powertrain system of FIG. 1. [Figure 4] FIG. 2 is a power path diagram of the pure electric mode two stages of the twin-motor multi-stage hybrid powertrain system of FIG. 1. [Diagram 5] FIG. 2 is a power path diagram of the first stage of the twin-motor multi-stage hybrid powertrain system in series mode of FIG. 1. [Figure 6] FIG. 2 is a power path diagram of the series mode second stage of the twin-motor multi-stage hybrid powertrain system of FIG. 1. [Figure 7] FIG. 2 is a power path diagram of one stage of the parallel mode twin-motor multi-stage hybrid powertrain system of FIG. 1. [Figure 8] FIG. 2 is a power path diagram of the parallel mode two stages of the twin motor multi-stage hybrid powertrain system of FIG. 1. [Figure 9] FIG. 2 is a power path diagram of the three parallel-mode stages of the twin-motor multi-stage hybrid powertrain system of FIG. 1. [Figure 10] FIG. 2 is a power path diagram of the four parallel-mode stages of the twin-motor multi-stage hybrid powertrain system of FIG. 1. [Figure 11] FIG. 2 is a power path diagram of the twin-motor multi-stage hybrid powertrain system of FIG. 1 in power split mode. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] In the following, the technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. It is clear that the described embodiments are not all the embodiments of the present application, but are only some of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without performing creative work are within the scope of protection of the present application.

[0019] If the embodiments of the present application involve directional indications (e.g., up, down, left, right, front, back, etc.), it should be explained that the directional indications are used only to describe the relative positional relationships, movement conditions, etc. between each part in a certain position (as shown in the attached drawings), and if the specific position changes, the directional indications also change accordingly.

[0020] In addition, when the description of "first", "second", etc. is concerned in the embodiments of the present application, the description of "first", "second", etc. is only used for explanation, and should not be understood as presenting or implying the relative importance thereof, or as implicitly specifying the number of technical features presented. Thus, a feature limited to "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the term "and / or" in the present text is merely a relational relationship for explaining related objects, and means that three relations may exist. For example, in the case of A and / or B, three situations can be represented: only A exists, A and B exist simultaneously, and only B exists. In addition, the technical solutions of each embodiment can be combined with each other. However, it is premised that a person skilled in the art can realize it. If a contradiction occurs in the combination of technical solutions or it cannot be realized, it should be understood that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0021] In recent years, hybrid vehicles are becoming the mainstream in vehicle development due to their advantages such as high practicality and environmental protection. Currently, hybrid systems in general use often adopt a fixed speed ratio, but a fixed speed ratio makes it difficult for the engine to operate economically and also limits the power transmission performance. Therefore, this application proposes a twin-motor multi-stage hybrid powertrain system.

[0022] 1, in the embodiment of the present application, the twin-motor multi-stage hybrid powertrain system includes an engine 11, a first motor 12, a second motor 13, a first clutch 21, a second clutch 22, a first planetary gear mechanism 60, a second planetary gear mechanism 70, a first input shaft 31, a second input shaft 32, a third input shaft 33, and a brake assembly. The first input shaft 31 is connected to the engine 11 via the first clutch 21, and the second input shaft 32 is connected to the engine 11 via the second clutch 22 and is idlingly disposed outside the first input shaft 31. Specifically, the first input shaft 31 is fixed to a driven plate of the first clutch 21, and a drive plate of the first clutch 21 is connected to a flywheel of the engine 11. By engaging the first clutch 21 with the engine 11, the power of the engine 11 can be transmitted through the first input shaft 31, and by separating the first clutch 21 with the engine 11, the power of the engine 11 can be cut off through the first input shaft 31. The second input shaft 32 is fixed to a driven plate of the second clutch 22, and a drive plate of the second clutch 22 is connected to a flywheel of the engine 11. By engaging the second clutch 22 with the engine 11, the power of the engine 11 can be transmitted through the second input shaft 32, and by separating the second clutch 22 with the engine 11, the power of the engine 11 can be cut off through the second input shaft 32. The first input shaft 31 and the second input shaft 32 are provided on the same shaft, the first input shaft 31 is a solid shaft, the second input shaft 32 is a hollow shaft, and the second input shaft 32 is idly rotatably installed on the outside of the first input shaft 31, and the two are capable of relative rotation. The first clutch 21 and the second clutch 22 are DCT twin clutches, specifically, they may be dry DCT twin clutches or wet DCT twin clutches. Of course, the first clutch 21 and the second clutch 22 may be two single clutches, specifically, they may be dog clutches or dry clutches.

[0023] The first motor 12 is connected to the engine 11, specifically, a rotor shaft of the first motor 12 is spline-connected to an output shaft of a flywheel of the engine 11 and is disposed so as to transmit the power of the engine 11 to the first motor 12. The first motor 12 may be driven by the engine 11 to generate power as a generator, or may realize a driving function as a drive motor.

[0024] The second motor 13 is connected to the first planetary gear mechanism 60 via the third input shaft 33. Specifically, the second motor 13 is capable of realizing a driving function as a driving motor, so that the driving force of the second motor 13 is transmitted to the first planetary gear mechanism 60 via the third input shaft 33.

[0025] In one embodiment, a speed ratio gear can be incorporated between the first motor 12 and the engine 11 to generate different speeds and provide more gear stages for the twin motor multi-stage hybrid powertrain system, thereby providing more options when selecting and matching the engine 11 and first motor 12.

[0026] Both the first motor 12 and the second motor 13 have driving capabilities, and under the premise of lowering the performance of the second motor 13, the performance of the first motor 12 is improved to reduce costs, while in the twin motor driving mode, the engine 11 can flexibly transition to series mode to supply energy to the twin motors.

[0027] The brake assembly is arranged to brake the first planetary gear mechanism 60 and / or the second planetary gear mechanism 70; specifically, the brake assembly is connected to the first planetary gear mechanism 60 and / or the second planetary gear mechanism 70; when the brake assembly is connected to the first planetary gear mechanism 60 and / or the second planetary gear mechanism 70, power transmission in the first planetary gear mechanism 60 and / or the second planetary gear mechanism 70 can be realized, and when the brake assembly is separated from the first planetary gear mechanism 60 and / or the second planetary gear mechanism 70, power transmission in the first planetary gear mechanism 60 and / or the second planetary gear mechanism 70 can be cut off.

[0028] In one embodiment of the present application, a twin clutch is used to couple two input shafts coupled to a socket, and the first clutch 21 is coupled to the engine 11 via the first input shaft 31, and the second clutch 22 is coupled to the engine 11 via the second input shaft 32, thereby realizing the transmission of the power of the engine 11 by the two input shafts, and further to the first planetary gear mechanism 60 and / or the second planetary gear mechanism 70. The coupling of the second motor 13 and the first planetary gear mechanism 60 realizes the transmission of the power of the second motor 13 to the first planetary gear mechanism 60. Furthermore, the transmission of the power in the first planetary gear mechanism 60 and / or the second planetary gear mechanism 70 is controlled by a brake assembly, and at the same time, the engine 11 is coupled to the first motor 12 to transmit the power of the engine 11 to the first motor 12, thereby realizing modes such as a pure electric mode, a series mode, a parallel mode, a power split mode, and other driving modes. Compared with the existing hybrid powertrain system, the problem of a fixed speed ratio is solved. According to various driving modes, the speed ratio of the twin-motor multi-stage hybrid powertrain system can be flexibly adjusted to optimize economy without reducing performance, and the engine 11 can be operated at an optimal operating point, thus improving power transmission performance while allowing the engine 11 to operate more economically and improve transmission efficiency. In addition, both the first motor 12 and the second motor 13 have driving capabilities, and under the premise of reducing the performance of the second motor 13, the performance of the first motor 12 can be improved to reduce costs, while in the twin-motor driving mode, the engine 11 can flexibly switch to series mode to supply energy to the twin motors, enhancing the driving force of the vehicle.

[0029] Continuing to show in FIG. 1, the first planetary gear mechanism 60 includes a first sun gear 61, a first planetary carrier 62, a first planetary gear 63, and a first ring gear 64, and the second planetary gear mechanism 70 includes a second sun gear 71, a second planetary carrier 72, a second planetary gear 73, and a second ring gear 74.

[0030] Specifically, the first sun gear 61 is connected to the second motor 13 via the third input shaft 33, the first planetary carrier 62 is connected to the second ring gear 74, the first planetary gear 63 is fixed to the first planetary carrier 62, and the ring gear 64 is connected to the second planetary carrier 72. The first planetary gear mechanism 60 and the second planetary gear mechanism 70 are connected to each other, thereby realizing power transmission between the first planetary gear mechanism 60 and the second planetary gear mechanism 70. Both the second sun gear 71 and the second planetary carrier 72 are connected to a brake assembly, and the second planetary gear mechanism 70 is connected to the brake assembly, thereby enabling the brake assembly to control the power transmission of the second planetary gear mechanism 70, and further realizing the brake assembly to control the power transmission by the first planetary gear mechanism 60. By controlling the brake assemblies in the power transmission of the first planetary gear mechanism 60 and / or the second planetary gear mechanism 70, multi-stage drive modes can be realized, adapting to a wider range of actual driving conditions and expanding the application range of the twin-motor multi-stage hybrid powertrain system.

[0031] 1 , the brake assembly further includes a first brake 41 connected to the second planetary carrier 72. Specifically, the first brake 41 is spline-connected to the second input shaft 32 via a friction plate, a steel piece of the first brake 41 is spline-connected to the transmission housing, and a rotating portion of the first brake 41 is connected to the second planetary carrier 72. In this manner, by controlling the connection or disconnection between the first brake 41 and the second planetary carrier 72, control of the transmission or disconnection of power in the first planetary gear mechanism 60 is realized.

[0032] The brake assembly includes a second brake 42 connected to a second sun gear 71. Specifically, a steel piece of the second brake 42 is connected to the transmission housing via a spline, and the twin-motor multi-stage hybrid powertrain system further includes a first intermediate shaft 34, which is rotatably supported on the outside of the first input shaft 31, and the second brake 42 is connected to the second sun gear 71 via the first input shaft 34. In this manner, by controlling the engagement or disengagement of the second brake 42 and the second sun gear 71, control of the transmission or interruption of power in the second planetary gear mechanism 70 is realized.

[0033] 1 , the twin motor multi-stage hybrid powertrain system further includes a second intermediate shaft 35 that is connected to the second ring gear 74 and arranged to output power. The twin motor multi-stage hybrid powertrain system further includes a differential 50 that is connected to the second intermediate shaft. In this manner, the power of the engine 11 and / or the first motor 12 and / or the second motor 13 is transmitted through the input shaft and the planetary gear mechanism, then transmitted to the second intermediate shaft 35 via the second ring gear 74, to the differential 50, and further transmitted to the driver shaft via the differential 50, and finally output to the wheels to drive the vehicle.

[0034] Furthermore, in order to reduce the natural frequency of the torsional vibration of the powertrain system, the twin-motor multi-stage hybrid powertrain system further includes a torsional vibration damper (not shown) provided between the engine and the first motor. The torsional vibration damper can reduce the natural frequency of the torsional vibration of the powertrain system by reducing the torsional rigidity of the connection between the crankshaft of the engine 11 and the powertrain system, increase the torsional damping of the powertrain system, suppress the amplitude corresponding to the torsional resonance, and damp the instantaneous torsional vibration caused by the shock. The torsional vibration damper can control the torsional vibration of the clutch and transmission shaft system when the power transmission assembly is idling, eliminate the idling noise of the transmission and the torsional vibration and noise of the main reduction gear and the transmission, and can also mitigate the torsional shock load of the powertrain system in an unstable driving state, improving the smoothness of the clutch operation.

[0035] Continuing to show in FIG. 1, both the first motor 12 and the second motor 13 are coupled to a traction battery (not shown), and the twin motor multi-stage hybrid powertrain system has any one or more of the following operating modes: Pure electric mode: the second motor 13 operates as a drive motor using the electric energy of the power battery, the engine 11 is not operating, and the first motor 12 is not operating. Series mode: The second motor 13 operates as a drive motor using the electric energy of the power battery, and the engine 11 drives the first motor 12 as a generator to supply power to the second motor 13 or charge the power battery in a set predetermined operating state. The set predetermined operating state may be a situation where the power battery is insufficient. Parallel mode: the engine 11 operates at a set economical operating point, the second motor 13 outputs power or charges the power battery according to the current power demand or the power battery power demand, and the first motor 12 does not operate. The engine 11 operating at a set economical operating point specifically means that the engine 11 operates at an operating point with low fuel consumption, and the fuel consumption can be determined based on an engine fuel consumption map. Power Split Mode: The second motor 13 operates as a drive motor using the electric energy of the drive battery, and while the engine 11 is operating, the engine 11 drives the first motor 12 as a generator to generate electricity and supply it to the second motor 13, or The second motor 13 operates as a drive motor using the electric energy of the drive battery, and at the same time that the engine 11 is operating, the first motor 12 operates as a drive motor using the electric energy of the drive battery.

[0036] Example 1 Specifically, the twin-motor multi-stage hybrid powertrain system can realize multi-stage operation in pure electric mode, series mode, parallel mode, and power split mode. In this embodiment, a total of nine speeds are described as an example, including pure electric mode 1, pure electric mode 2, series mode 1, series mode 2, parallel mode 1, parallel mode 2, parallel mode 3, parallel mode 4, and power split mode.

[0037] The operating conditions of the first embodiment are shown in Table 1. [Table 1]

[0038] Figures 3 to 11 correspond to the power paths of the twin-motor multi-stage hybrid powertrain system in pure electric mode 1 stage, pure electric mode 2 stage, series mode 1 stage, series mode 2 stage, parallel mode 1 stage, parallel mode 2 stage, parallel mode 3 stage, parallel mode 4 stage and parallel mode 4 stage, and the thick lines in each figure indicate the power paths.

[0039] As shown in FIG. 3, in this embodiment, in the pure electric mode 1, the first brake 41 is engaged, the second planetary carrier 72 is fixed, and the second motor 13 drives the first sun gear 61, which transmits power through the first planetary gear 63 and the first planetary carrier 62 to the second ring gear 74, which transmits power to the second intermediate shaft 35 and further to the differential 50.

[0040] As shown in FIG. 4, in this embodiment, in the pure electric mode 2 stage, the second brake 42 is engaged, the second sun gear 71 is fixed, and the second motor 13 drives the first sun gear 61, which transmits a portion of the power to the second ring gear 74 via the first planetary gear 63 and the first planetary carrier 62, and another portion of the power to the first ring gear 64 via the first planetary carrier 62, and further from the first ring gear 64 to the second planetary carrier 72 and the second ring gear 74, and further the second ring gear 74 transmits this portion to the second intermediate shaft 35 and further to the differential 50.

[0041] 5, in this embodiment, in series mode 1, the first brake 41 is engaged, the second planetary carrier 72 is fixed, and the second motor 13 drives the first sun gear 61, which transmits power to the second ring gear 74 via the first planetary gear 63 and the first planetary carrier 62, and the second ring gear 74 transmits power to the second intermediate shaft 35 and further to the differential 50. The engine 11 drives the first motor 12, which functions as a generator, to generate power and charge the power battery.

[0042] 6, in this embodiment, in series mode 2, the second brake 42 is engaged, the second sun gear 71 is fixed, and the second motor 13 drives the first sun gear 61, which transmits a part of the power to the second ring gear 74 via the first planetary gear 63 and the first planetary carrier 62, and transmits another part of the power to the first ring gear 64 via the first planetary carrier 62, and further transmits the other part of the power from the first ring gear 64 to the second planetary carrier 72 and the second ring gear 74, which further transmits this part to the second intermediate shaft 35 and further to the differential 50. The engine 11 drives the first motor 12 as a generator to generate power and charge the power battery.

[0043] As shown in FIG. 7 , in this embodiment, in parallel mode 1 stage, the first brake 41 is engaged, the second planetary carrier 72 is fixed, and the second motor 13 drives the first sun gear 61, which transmits power via the first planetary gear 61, the first planetary carrier 62, and the second ring gear 74, which transmits power to the second intermediate shaft 35 and further to the differential 50. At the same time, the first brake 21 is engaged and the engine 11 transmits power via the first brake 21 to the first import shaft 31, and then to the first sun gear 61, which transmits power via the first planetary gear 63 and the first planetary carrier 62 to the second ring gear 74, which transmits power to the second intermediate shaft 35, and then to the differential 50.

[0044] As shown in FIG. 8, in this embodiment, in parallel mode 2 stage, the second brake 42 is engaged, the second sun gear 71 is fixed, the second motor 13 drives the first sun gear 61, the first sun gear 61 transmits a portion of the power to the second ring gear 74 via the first planetary gear 63 and the first planetary carrier 62, and transmits another portion of the power to the first ring gear 64 via the first planetary carrier 62, and further from the first ring gear 64 to the second planetary carrier 72 and the second ring gear 74, and further the second ring gear 74 transmits this portion to the second intermediate shaft 35, and further to the differential 50. At the same time, the first brake 21 is engaged and the engine 11 transmits power through the first brake 21 to the first import shaft 31, and then to the first sun gear 61, which transmits a portion of the power from the first sun gear 61 to the second ring gear 74 via the first planetary gear 63 and the first planetary carrier 62, which transmits another portion of the power to the first ring gear 64, which transmits the other portion of the power from the first ring gear 64 to the second planetary carrier 72 and the second ring gear 74, which transmits this portion to the second intermediate shaft 35 and then to the differential 50.

[0045] As shown in FIG. 9 , in this embodiment, in parallel mode 3-stage, the first brake 41 is separated, the second brake 42 is separated, the second motor 13 drives the first sun gear 61, the first sun gear 61 transmits a portion of the power to the second ring gear 74 via the first planetary gear 63 and the first planetary carrier 62, and transmits another portion of the power to the first ring gear 64 via the first planetary carrier 62, and further from the first ring gear 64 to the second planetary carrier 72 and the second ring gear 74, and further the second ring gear 74 transmits this portion to the second intermediate shaft 35, and further to the differential 50. At the same time, the first brake 21 is engaged and the engine 11 transmits power through the first brake 21 to the first import shaft 31, and then to the first sun gear 61, which transmits a portion of the power from the first sun gear 61 to the second ring gear 74 via the first planetary gear 63 and the first planetary carrier 62, which transmits another portion of the power to the first ring gear 64, which transmits the other portion of the power from the first ring gear 64 to the second planetary carrier 72 and the second ring gear 74, which transmits this portion to the second intermediate shaft 35 and then to the differential 50. At the same time, the second brake 22 is engaged and the engine 11 transmits power through the second brake 22 to the second input shaft 32, which then transmits power to the second planetary gear 72 and the second ring gear 74, which then transmits power to the second intermediate shaft 35 and further to the differential 50.

[0046] As shown in FIG. 10 , in this embodiment, in parallel mode 4-speed, the second brake 42 is engaged, the second sun gear 71 is fixed, the second motor 13 drives the first sun gear 61, the first sun gear 61 transmits a portion of the power to the second ring gear 74 via the first planetary gear 63 and the first planetary carrier 62, and transmits another portion of the power to the first ring gear 64 via the first planetary carrier 62, and further from the first ring gear 64 to the second planetary carrier 72 and the second ring gear 74, and further the second ring gear 74 transmits this portion to the second intermediate shaft 35, and further to the differential 50. At the same time, the second brake 22 is engaged, transmitting a portion of the power of the engine 11 through the second brake 22 to the second input shaft 32, and then to the second planetary gear 72 and the second ring gear 74, which transmits this portion of the power to the second intermediate shaft 35 and then to the differential 50. At the same time, another part of the power of the engine 11 drives the first motor 12 acting as a generator to generate electricity and charge the power battery.

[0047] As shown in FIG. 11 , in this embodiment, in power split mode, the first brake 41 is disengaged, the second brake 42 is disengaged, the second motor 13 drives the first sun gear 61, the first sun gear 61 transmits a portion of the power via the first planetary gear 63 and the first planetary carrier 62 to the second ring gear 74, and another portion of the power via the first planetary carrier 62 to the first ring gear 64, and further from the first ring gear 64 to the second planetary carrier 72 and the second ring gear 74, and further the second ring gear 74 transmits this portion to the second intermediate shaft 35 and further to the differential 50. At the same time, the second brake 22 is engaged, transmitting a portion of the power of the engine 11 through the second brake 22 to the second input shaft 32, and then to the second planetary gear 72 and the second ring gear 74, which transmits this portion of the power to the second intermediate shaft 35 and then to the differential 50. At the same time, another part of the power of the engine 11 is used to drive the first motor 12 acting as a generator to generate electricity, which is then supplied to the second motor 13 for use in driving the second motor. At the same time, the first motor 12 can participate in driving as a drive motor.

[0048] When switching between various gear stages, the DCT shift mode may be used, or the gear stage may be switched by controlling the first motor 12 and / or the second motor 13. This system has extremely high operability, and makes it easy to perform decoupling operations for switching gear stages.

[0049] In each mode and gear ratio, both the first motor 12 and the second motor 13 can be used for energy recovery; specifically, both the first motor 12 and the second motor 13 can convert the kinetic energy of the vehicle's gliding into electrical energy, which is stored in the power battery and used to drive the first motor 12 and / or the second motor 13.

[0050] The above nine gears can adapt to different road conditions and meet the needs of different driving conditions. The road conditions that each gear is suitable for are as follows: When the vehicle speed is in the range of 0-40km / h: If the output torque is small, the pure electric 1st gear can be used; if the SOC power is lower than the threshold, the series 1st gear can be used for charging and driving; if the output torque is large, the parallel 1st gear can be used. When the vehicle speed is in the range of 40~60km / h: If the output torque is small, the pure electric 2nd gear can be used; if the SOC power is lower than the threshold, the series 2nd gear can be used for charging and driving; if the output torque is large, the parallel 2nd gear can be used. When the vehicle speed is in the range of 60 to 120 km / h: When the output torque is small, the power split mode can be used, and when the output torque is large, the parallel 3-speed can be used. When the vehicle speed is in the range of 120 to 160 km / h: When the output torque is small, the parallel 4th gear may be used, when the SOC power is lower than the threshold value, the power split mode may be used for driving, and when the output torque is large, the parallel 3rd gear or the parallel 4th gear may be used. When the vehicle speed is in the range of 160 to maximum km / h: When the output torque is small and / or large, the power split mode may be used.

[0051] Each gear can realize pure electric mode, series mode, parallel mode and power split mode at appropriate vehicle speeds, realizing the multi-stage of the twin-motor multi-stage hybrid powertrain system and meeting the needs of different driving conditions.

[0052] Of course, the adaptive relationship between the gears and the road conditions is not limited to the above, and different gears can be arranged according to the road conditions based on fuel consumption and power. Here, there is no restriction on the adaptive relationship between the gears and the road conditions.

[0053] Example 2 2, the twin motor multi-stage hybrid powertrain system can realize multi-stage operation in pure electric mode, series mode, parallel mode, and power split mode. In this embodiment, a total of five gear stages can be realized, including one pure electric mode stage, one series mode stage, one parallel mode stage, three parallel mode stages, and power split mode stage.

[0054] The difference from the first embodiment is that the second brake 42 is canceled, and the second sun gear 71 is idly rotatably disposed on the outside of the first input shaft 31. The number of gears is reduced to pure electric mode 2-speed, series mode 2-speed, parallel mode 2-speed, and parallel mode 4-speed, and the power transmission paths of the other gears remain unchanged.

[0055] The other features of this embodiment are similar to those of the first embodiment, and therefore will not be described.

[0056] The present application also proposes a vehicle (not shown) equipped with a twin-motor multi-stage hybrid powertrain system, and the specific structure of the twin-motor multi-stage hybrid powertrain system is referred to the above-mentioned embodiment. The vehicle employs all the aspects of all the above-mentioned embodiments, so they will not be repeated here, but at least has all the functions provided by the aspects of the above-mentioned embodiment.

[0057] The above is merely a preferred embodiment of the present application, and does not limit the scope of the patent of the present application. Under the application concept of the present application, the equivalent structural transformation made by using the contents of the specification and the attached drawings of the present application, or the direct / indirect application to other related technical fields, are all included in the scope of protection of the patent of the present application. [Explanation of symbols]

[0058] 11 Engine 12 First motor 13 Second motor 21 First clutch 22 Second clutch 31 First input shaft 32 Second input shaft 33 3rd input shaft 34 First intermediate shaft 35 Second intermediate shaft 41 First brake 42 No. 2 brake 50 Differential 60 First planetary gear mechanism 61 1st sun gear 62 First Planetary Carrier 63 First planetary gear 64 1st ring gear 70 Second planetary gear mechanism 71 Second sun gear 72 Second Planetary Carrier 73 2nd planetary gear 74 2nd ring gear

Claims

1. the engine includes a first motor, a second motor, a first clutch, a second clutch, a first planetary gear mechanism, a second planetary gear mechanism, a first input shaft, a second input shaft, a third input shaft, and a brake assembly; the first input shaft is connected to the engine via the first clutch, the second input shaft is connected to the engine via the second clutch, and the second input shaft is idly rotatably disposed outside the first input shaft; the first motor is coupled to the engine; the second motor is coupled to the first planetary gear mechanism via the third input shaft; the brake assembly is arranged to brake the first planetary gear set and / or the second planetary gear set; Both the first motor and the second motor are connected to a power battery; the first planetary gear mechanism includes a first sun gear, a first planetary carrier, a first planetary gear, and a first ring gear; the second planetary gear mechanism includes a second sun gear, a second planetary carrier, a second planetary gear, and a second ring gear; the first planetary carrier is connected to the second ring gear, and the second planetary carrier is connected to the first ring gear; the brake assembly includes a second brake coupled to the second sun gear; a first intermediate shaft rotatably supported on the outside of the first input shaft, the second brake being connected to the second sun gear via the first intermediate shaft; Pure electric mode, series mode, parallel mode and power split mode are all possible. the pure electric mode is a mode in which the second motor operates as a drive motor by utilizing the electric energy of the power battery, the engine is not operated, and the first motor is not operated; the series mode is a mode in which the second motor operates as a drive motor by utilizing the electric energy of the power battery, and the engine drives the first motor as a generator to supply electric power to the second motor, or charges the power battery in a set predetermined operating state; In the parallel mode, the engine is operated, the second motor performs power output or charges the power battery according to a current power demand or a power demand of the power battery, and the first motor is not operated. The power split mode is The second motor operates as a drive motor by utilizing the electric energy of the power battery, and at the same time as the engine operates, the engine drives the first motor as a generator to generate electricity and supply it to the second motor, or the second motor operates as a drive motor by utilizing the electric energy of the power battery, and the first motor operates as a drive motor by utilizing the electric energy of the power battery while the engine is operating. Mode A twin-motor multi-stage hybrid powertrain system.

2. 2. The twin motor multi-stage hybrid powertrain system of claim 1, wherein the brake assembly includes a first brake coupled to the second planetary carrier.

3. 2. The twin motor multi-stage hybrid powertrain system of claim 1, further comprising a second intermediate shaft coupled to the second ring gear and configured to output power.

4. 4. The twin motor multi-stage hybrid powertrain system according to claim 3, further comprising a differential coupled to the second intermediate shaft.

5. 2. The twin-motor multi-stage hybrid powertrain system according to claim 1, further comprising a torsional vibration damper disposed between the engine and the first motor.

6. A vehicle comprising a twin motor multi-stage hybrid powertrain system according to any one of claims 1 to 5.

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