A dual-motor two-speed multi-mode hybrid transmission and a speed changing method

Abstract

The present invention discloses a dual-motor two-speed multi-mode hybrid transmission and a speed change method. The transmission includes a housing, a main shaft, a first planetary mechanism, a second planetary mechanism, a first brake, a second brake, a first clutch, a second clutch, a first motor and a second motor. The main shaft is rotatably connected in the housing. The main shaft is used for transmission connection to the output shaft of the engine. Two planetary mechanisms and two motors are used for linkage to realize two pure electric drive modes, two engine direct drive modes, and two continuously variable speed change modes, a total of six drive modes. Through control by two clutches and two brakes, continuous switching of different modes under different road conditions can be realized, greatly improving fuel economy and driving comfort. Because only two planetary mechanisms are used in structure, the structural layout is simpler.

Description

Technical Field

[0001] The present invention relates to the field of transmissions, and in particular to a dual-motor two-speed multi-mode hybrid power transmission and a speed changing method. Background Art

[0002] The current mainstream hybrid transmissions with dual motors and multiple gears mostly adopt a DCT structure. There is power interruption when shifting, which gives a very unsmooth feeling. The dual-motor single-speed transmission has relatively few gears, and the working pressure of the motor becomes greater. It is necessary to increase the working speed of the motor to obtain better power and maximum vehicle speed. In addition, since the engine has only one gear when driving directly, the power range of the engine is relatively limited. Especially when cruising at high speed, it needs to be converted to extended-range mode (the generator generates electricity to the drive motor) to work. If a single-motor hybrid transmission requires more gears, its structure is often more complicated. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a dual-motor two-speed multi-mode hybrid transmission, which can simplify the structure and has more speed gears and speed modes.

[0004] The invention also provides a speed changing method.

[0005] A dual-motor two-speed multi-mode hybrid transmission according to an embodiment of the first aspect of the present invention comprises a housing, a main shaft, a first planetary mechanism, a second planetary mechanism, a first brake, a second brake, a first clutch, a second clutch, a first motor and a second motor, wherein the main shaft is rotatably connected in the housing, and the main shaft is used for transmission connection to the output shaft of the engine; the first planetary mechanism comprises a first sun gear, a first planetary row, a first planetary carrier and a first ring gear, wherein the first planetary row is meshedly connected between the first ring gear and the first sun gear, and the first planetary carrier is connected to the first planetary row; the second planetary mechanism comprises a second sun gear, a second planetary row, a second planetary carrier and a second ring gear, wherein the second planetary row is meshedly connected between the second ring gear and the second sun gear, the second planetary carrier is connected to the second planetary row, and the second sun gear is connected The first sun gear and the second sun gear rotate synchronously with the first sun gear, the second ring gear is connected to the first planetary carrier, and the second ring gear is used to output power; one end of the first brake is connected to the housing, and the other end of the first brake is connected to the first sun gear, and the first brake, the first sun gear and the second sun gear are connected as a whole; one end of the second brake is connected to the housing, and the other end of the second brake is connected to the second planetary carrier; one end of the first clutch is connected to the main shaft, and the other end of the first clutch is connected to the first sun gear; the first motor is arranged in the housing, and the output end of the first motor is transmission-connected to the first ring gear; the second motor is arranged in the housing, and the rotor of the second motor is connected to the main shaft as a whole, and the rotor of the second motor and the main shaft are both connected to the second planetary carrier through the second clutch.

[0006] A dual-motor, two-speed, multi-mode hybrid transmission according to an embodiment of the present invention has at least the following beneficial effects: two planetary mechanisms and two motors are used in linkage to realize two pure electric drive modes, two engine direct drive modes, and two continuously variable speed modes, a total of six drive modes, which are controlled by two clutches and two brakes to achieve continuous switching of different modes for different road conditions, greatly improving fuel economy and driving comfort. Since only two planetary mechanisms are used in structure, the structural layout is simpler, and it is also beneficial to the production of parts and components, and it is also simpler in production implementation. The entire system adopts 3 degrees of freedom or 2 degrees of freedom, and there are only two clutches or one brake and one clutch each time. The operation is simple, thereby having higher efficiency. In addition, since a motor is added, extended-range drive can be realized, and since the gears are reduced, the drive mode switching is simpler.

[0007] According to some embodiments of the present invention, the second brake and the second clutch are disposed on both sides of the second planetary carrier. Such an arrangement ensures that the second brake and the second clutch do not interfere with each other and can balance the forces.

[0008] According to some embodiments of the present invention, the rotor of the second motor is connected to the main shaft via the same connecting portion, and the connecting portion is connected to the second planetary carrier via a second clutch, so that one second clutch can control the connection state of the main shaft and the second motor, thereby facilitating multi-mode control.

[0009] According to some embodiments of the present invention, the first motor is disposed on a circumferential side of the first planetary mechanism, and the second motor is disposed at an end of the second planetary carrier away from the first planetary mechanism.

[0010] According to some embodiments of the present invention, a torsional vibration damper is further included. The torsional vibration damper is arranged between the engine and the main shaft. The engine is connected to the main shaft through the torsional vibration damper. The torsional vibration damper is arranged to reduce vibration during the transmission process.

[0011] According to some embodiments of the present invention, the first planetary mechanism is farther away from the engine than the second planetary mechanism.

[0012] According to some embodiments of the present invention, the first planet carrier and the second ring gear are connected via a connecting frame, and the connecting frame is provided to connect the first planet carrier and the second ring gear as a whole to facilitate synchronous movement of the two, thereby realizing multi-mode control.

[0013] A speed shifting method according to a second aspect of an embodiment of the present invention includes a dual-motor two-speed multi-mode hybrid transmission according to the first aspect of the present invention, including the following steps:

[0014] S1, the first clutch and the second clutch are engaged, all brakes are in a non-operating state, the main shaft transmits part of the power to the second sun gear through the first clutch, and the other part of the power is transmitted to the second planetary carrier through the second clutch, and the power is mixed in the second planetary gear and transmitted to the output gear through the second ring gear to achieve the transmission of the first gear ratio;

[0015] S2, the second clutch and the first brake are engaged, the other clutches are in a disengaged state, the second brake is in a non-operating state, the main shaft transmits power to the second planetary carrier through the second clutch, the first brake fixes the first sun gear, the power is transmitted to the second ring gear through the second planetary carrier, and the power is transmitted to the output gear through the second ring gear to achieve the transmission of the second gear ratio;

[0016] S3, the second brake is engaged, all clutches are in a disengaged state, the first brake is not working, the power of the first motor is transmitted to the first ring gear, part of the power transmitted from the first ring gear is transmitted to the second ring gear through the first planet carrier, and the other part is transmitted to the second sun gear through the first sun gear, and then transmitted to the second planetary gear by the second sun gear, and then transmitted to the second ring gear by the second planetary gear, and then transmitted to the second ring gear by the second planetary gear, and then transmitted to the output gear through the second ring gear, so as to realize the transmission of the first gear power of the electric drive;

[0017] S4, the first brake is engaged, other clutches are in a disengaged state, the second brake is not operated, the power of the first motor is transmitted to the first ring gear, and then the power enters the first planetary gear set, the first planetary gear set transmits the power from the first planetary carrier to the second ring gear, and the second ring gear transmits the power to the output gear, so as to realize the transmission of the electric drive second gear;

[0018] S5, the first clutch is engaged, the other clutches are in a disengaged state, the first brake and the second brake are not operated, the power on the main shaft is transmitted to the first sun gear through the first clutch, the power of the first motor is transmitted to the first ring gear, the power of the engine and the power of the first motor are mixed in the first planetary gear, and transmitted to the second ring gear through the first planetary carrier, and the power is transmitted to the output gear through the second ring gear, so as to realize the power transmission in EVT1 mode;

[0019] S6, engage the second clutch, and the other clutches are in a disengaged state. The first brake and the second brake do not work, and the power of the engine is transmitted to the second clutch through the main shaft, and then transmitted to the second planetary carrier through the second clutch. The power of the first motor is transmitted to the first ring gear, and the first ring gear transmits part of the power to the first planetary carrier, and the other part is transmitted to the second sun gear through the first sun gear, and then from the second sun gear to the second planetary gear. After the second planetary gear is mixed with the engine power, it is transmitted to the second ring gear, and the power is transmitted to the output gear through the second ring gear to realize the power transmission in EVT2 mode.

[0020] A speed shifting method according to an embodiment of the present invention has at least the following beneficial effects: two planetary mechanisms and two motors are used for linkage to realize two pure electric drive modes, two engine direct drive modes, and two continuously variable speed shifting modes, a total of six drive modes, which are controlled by two clutches and two brakes to realize continuous switching of different modes for different road conditions, greatly improving fuel economy and driving comfort. Since only two planetary mechanisms are used in structure, the structural layout is simpler, and it is also beneficial to the production of parts and components, and it is also simpler in production implementation. The entire system adopts 3 degrees of freedom or 2 degrees of freedom, and there are only two clutches or one brake and one clutch each time. The operation is simple, thus having higher efficiency. In addition, since a motor is added, extended-range drive can be realized, and since the gears are reduced, the drive mode switching is simpler.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 A schematic diagram of the structure of a dual-motor two-speed multi-mode hybrid transmission according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the planetary mechanism of a dual-motor two-speed multi-mode hybrid transmission is shown.

[0025] Box body 100, connecting portion 110, torsion damper 120, connecting frame 130, bending portion 140;

[0026] Spindle 200;

[0027] A first sun gear 310, a first planet row 320, a first planet carrier 330, and a first ring gear 340;

[0028] A second sun gear 410, a second planet row 420, a second planet carrier 430, and a second ring gear 440;

[0029] A first brake 510 and a second brake 520;

[0030] A first clutch 610, a second clutch 620;

[0031] A first motor 700 , a second motor 800 , and an engine 900 . DETAILED DESCRIPTION

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present invention, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0035] Reference Figure 1 and Figure 2 A dual-motor, two-speed, multi-mode hybrid transmission according to an embodiment of the first aspect of the present invention includes a housing 100, a main shaft 200, a first planetary mechanism, a second planetary mechanism, a first brake 510, a second brake 520, a first clutch 610, a second clutch 620, a first motor 700 and a second motor 800, the main shaft 200 is rotatably connected in the housing 100, and the main shaft 200 is used for transmission connection to the output shaft of the engine 900.

[0036] Reference Figure 2The first planetary mechanism includes a first sun gear 310, a first planet row 320, a first planet carrier 330 and a first ring gear 340. The first planet row 320 is meshed and connected between the first ring gear 340 and the first sun gear 310, and the first planet carrier 330 is connected to the first planet row 320. The second planetary mechanism includes a second sun gear 410, a second planet row 420, a second planet carrier 430 and a second ring gear 440. The second planet row 420 is meshed and connected between the second ring gear 440 and the second sun gear 410. The second planet carrier 430 is connected to the second planet row 420. The second sun gear 410 is connected to the first sun gear 310. The second sun gear 410 rotates synchronously with the first sun gear 310. 440 is connected to the first planetary carrier 330, and the second ring gear 440 is used to output power. It can be understood that in the planetary mechanism, the so-called planetary row refers to a parts group composed of multiple planetary gears. This parts group is called a planetary row, but in fact, in the planetary mechanism, the sun gear, planetary carrier and ring gear are the main input or output components. One of the three is fixed, and the other two, one is used as input and the other is output. Generally speaking, the planetary carrier is used as output, but this is not entirely true. Even if the planetary carrier is used as input, power transmission can be generated. In addition, two of the three are used as input and the other is used as output. At this time, the output power can be adjusted by adjusting the power ratio of the two inputs, so that stepless speed change can be achieved.

[0037] Reference Figure 1 , one end of the first brake 510 is connected to the housing 100, and the other end of the first brake 510 is connected to the first sun gear 310, and the first brake 510, the first sun gear 310 and the second sun gear 410 are connected as a whole; one end of the second brake 520 is connected to the housing 100, and the other end of the second brake 520 is connected to the second planetary carrier 430; one end of the first clutch 610 is connected to the main shaft 200, and the other end of the first clutch 610 is connected to the first sun gear 310; the first motor 700 is arranged in the housing 100, and the output end of the first motor 700 is transmission-connected to the first ring gear 340. It can be understood that the first A brake 510 is mainly used to control the main shaft 200 to transmit power to the first sun gear 310 and the second sun gear 410, wherein the first sun gear 310 and the second sun gear 410 are actually a whole, and they move together when one moves and stop together. The power of the main shaft 200 is directly transmitted to the second sun gear 410 through the first brake 510. Since the first planetary mechanism has no fixed parts, the first sun gear 310 does not output power when it rotates. This is because among the three parts, only one part is input, and the other two are not fixed, so there is no output. This is different from two parts input and the other part output.

[0038] The second motor 800 is arranged in the housing 100, and the rotor of the second motor 800 is connected to the main shaft 200 as a whole. The rotor of the second motor 800 and the main shaft 200 are connected to the second planetary carrier 430 through the second clutch 620. This connection method means that the main shaft 200 can drive the rotor of the second motor 800 to rotate regardless of whether the second clutch 620 is closed or not, so that the second motor 800 can be used for charging. It can be understood that the second motor 800 stores energy after charging and can provide power for the first motor 700.

[0039] It should be understood that two planetary mechanisms and two motors are used in conjunction to realize two pure electric drive modes, two engine direct drive modes, and two continuously variable speed modes, a total of six drive modes. Through two clutches and two brakes for control, continuous switching of different modes for different road conditions can be achieved, greatly improving fuel economy and driving comfort. Because only two planetary mechanisms are used in structure, the structural layout is simpler, and it is also beneficial to the production of parts and components, and it is also simpler in production implementation. The entire system uses 3 degrees of freedom or 2 degrees of freedom, and only two clutches or one brake and one clutch are used each time. The operation is simple, resulting in higher efficiency. In addition, due to the addition of a motor, extended-range drive can be achieved, and due to the reduction in gears, the drive mode switching is simpler. It should be noted that if the motor is introduced into the drive in the two engine direct drive modes, a hybrid mode is formed, and two hybrid modes are formed.

[0040] In some embodiments, the second brake 520 and the second clutch 620 are disposed on both sides of the second planetary carrier 430 . Such an arrangement ensures that the second brake 520 and the second clutch 620 do not interfere with each other and can balance the forces.

[0041] In some embodiments, the rotor of the second motor 800 is connected to the main shaft 200 through the same connecting part 110, and the connecting part 110 is connected to the second planetary carrier 430 through the second clutch 620, so that a second clutch 620 can control the connection state of the main shaft 200 and the second motor 800, thereby facilitating multi-mode control.

[0042] In some embodiments, the first motor 700 is disposed on the circumferential side of the first planetary mechanism, and the second motor 800 is disposed at an end of the second planetary carrier 430 away from the first planetary mechanism.

[0043] Reference Figure 1 , and also includes a torsional vibration damper 120, which is arranged between the engine 900 and the main shaft 200. The engine 900 is connected to the main shaft 200 through the torsional vibration damper 120, and the torsional vibration damper 120 is arranged to reduce vibration during the transmission process.

[0044] In some embodiments, the first planetary mechanism is farther away from the engine 900 than the second planetary mechanism.

[0045] In some embodiments, the first planetary carrier 330 and the second ring gear 440 are connected via a connecting frame 130, and a bending portion 140 for avoidance is provided on the connecting frame 130. The connecting frame 130 connects the first planetary carrier 330 and the second ring gear 440 as a whole to facilitate synchronous movement of the two, thereby realizing multi-mode control.

[0046] A speed shifting method according to a second aspect of an embodiment of the present invention includes a dual-motor two-speed multi-mode hybrid transmission according to the first aspect of the present invention, including the following steps:

[0047] S1, the first clutch 610 and the second clutch 620 are engaged, all brakes are in a non-operating state, the main shaft 200 transmits part of the power to the second sun gear 410 through the first clutch 610, and the other part of the power is transmitted to the second planetary carrier 430 through the second clutch 620, and the power is mixed in the second planetary row 420 and transmitted to the output gear through the second ring gear 440 to achieve the transmission of the first gear ratio. It can be understood that the power of the first motor 700 and / or the second motor 800 is connected to achieve hybrid;

[0048] S2, the second clutch 620 and the first brake 510 are engaged, the other clutches are in a disengaged state, the second brake 520 is in a non-operating state, the main shaft 200 transmits power to the second planetary carrier 430 through the second clutch 620, the first brake 510 fixes the first sun gear 310, the power is transmitted to the second ring gear 440 through the second planetary carrier 430, and the power is transmitted to the output gear through the second ring gear 440 to achieve the transmission of the second gear ratio, and the power of the second motor 800 is connected to achieve hybrid;

[0049] S3, the second brake 520 is engaged, all clutches are in the disengaged state, the first brake 510 is not working, and the power of the first motor 700 is transmitted to the first ring gear 340. A part of the power transmitted from the first ring gear 340 is transmitted to the second ring gear 440 through the first planetary carrier 330, and the other part is transmitted to the second sun gear 410 through the first sun gear 310, and then transmitted to the second planetary gear 420 by the second sun gear 410, and then transmitted to the second ring gear 440 by the second planetary gear 420. The power is transmitted to the output gear through the second ring gear 440 to realize the transmission of the first gear power of the electric drive;

[0050] S4, the first brake 510 is engaged, the other clutches are in a disengaged state, the second brake 520 is not working, the power of the first motor 700 is transmitted to the first ring gear 340, and the power enters the first planetary gear row 320, the first planetary gear row 320 transmits the power from the first planetary carrier 330 to the second ring gear 440, and the second ring gear 440 transmits the power to the output gear, so as to realize the transmission of the electric drive second gear;

[0051] S5, the first clutch 610 is engaged, the other clutches are in the disengaged state, the first brake 510 and the second brake 520 are not working, the power on the main shaft 200 is transmitted to the first sun gear 310 through the first clutch 610, the power of the first motor 700 is transmitted to the first ring gear 340, the power of the engine 900 and the power of the first motor 700 are mixed in the first planetary row 320, and transmitted to the second ring gear 440 through the first planetary carrier 330, and the power is transmitted to the output gear through the second ring gear 440 to realize the power transmission in EVT1 mode;

[0052] S6, engage the second clutch 620, and the other clutches are in a disengaged state. The first brake 510 and the second brake 520 do not work, and the power of the engine 900 is transmitted to the second clutch 620 through the main shaft 200, and then transmitted to the second planetary carrier 430 through the second clutch 620. The power of the first motor 700 is transmitted to the first ring gear 340. The first ring gear 340 transmits part of the power to the first planetary carrier 330, and the other part is transmitted to the second sun gear 410 through the first sun gear 310, and then from the second sun gear 410 to the second planetary row 420. After the second planetary row 420 is mixed with the power of the engine 900, it is transmitted to the second ring gear 440. The power is transmitted to the output gear through the second ring gear 440 to realize the power transmission in EVT2 mode.

[0053] It should be understood that two planetary mechanisms and two motors are used in conjunction to realize two pure electric drive modes, two engine direct drive modes, and two continuously variable speed modes, a total of six drive modes, which are controlled by two clutches and two brakes to achieve continuous switching of different modes for different road conditions, greatly improving fuel economy and driving comfort. Because only two planetary mechanisms are used in structure, the structural layout is simpler, and it is also beneficial to the production of parts and components, and it is also simpler in production implementation. The entire system uses 3 degrees of freedom or 2 degrees of freedom, and only two clutches or one brake and one clutch work each time. The operation is simple, resulting in higher efficiency. In addition, due to the addition of a motor, extended-range drive can be achieved, and due to the reduction in gears, the drive mode switching is simpler.

[0054] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A dual-motor two-speed multi-mode hybrid transmission, characterized in that: include: box(100); A main shaft (200) is rotatably connected in the housing (100), and the main shaft (200) is used for transmission connection to an output shaft of the engine (900); A first planetary mechanism, comprising a first sun gear (310), a first planet row (320), a first planet carrier (330) and a first ring gear (340), wherein the first planet row (320) is meshedly connected between the first ring gear (340) and the first sun gear (310), and the first planet carrier (330) is connected to the first planet row (320); A second planetary mechanism, comprising a second sun gear (410), a second planet row (420), a second planet carrier (430) and a second ring gear (440), wherein the second planet row (420) is meshedly connected between the second ring gear (440) and the second sun gear (410), the second planet carrier (430) is connected to the second planet row (420), the second sun gear (410) is connected to the first sun gear (310), the second sun gear (410) rotates synchronously with the first sun gear (310), the second ring gear (440) is connected to the first planet carrier (330), and the second ring gear (440) is used to output power; A first brake (510), one end of which is connected to the housing (100), and the other end of which is connected to the first sun gear (310); the first brake (510), the first sun gear (310) and the second sun gear (410) are connected as a whole; A second brake (520), one end of which is connected to the housing (100), and the other end of which is connected to the second planet carrier (430); A first clutch (610), one end of which is connected to the main shaft (200), and the other end of the first clutch (610) is connected to the first sun gear (310); A first motor (700) is arranged in the housing (100), the output end of the first motor (700) being drivingly connected to the first gear ring (340); The second motor (800) is arranged in the housing (100), the rotor of the second motor (800) is integrally connected to the main shaft (200), and the rotor of the second motor (800) and the main shaft (200) are both connected to the second planetary carrier (430) via a second clutch (620).

2. A dual-motor two-speed multi-mode hybrid transmission according to claim 1, characterized in that: The second brake (520) and the second clutch (620) are arranged on both sides of the second planet carrier (430).

3. The dual-motor two-speed multi-mode hybrid transmission according to claim 1, characterized in that: The rotor of the second motor (800) is connected to the main shaft (200) via the same connecting portion (110), and the connecting portion (110) is connected to the second planet carrier (430) via a second clutch (620).

4. The dual-motor two-speed multi-mode hybrid transmission according to claim 1, characterized in that: The first motor (700) is arranged on the circumferential side of the first planetary mechanism, and the second motor (800) is arranged at an end of the second planetary carrier (430) away from the first planetary mechanism.

5. The dual-motor two-speed multi-mode hybrid transmission according to claim 1, characterized in that: It also includes a torsional vibration damper (120), wherein the torsional vibration damper (120) is arranged between the engine (900) and the main shaft (200), and the engine (900) is connected to the main shaft (200) via the torsional vibration damper (120).

6. The dual-motor two-speed multi-mode hybrid transmission according to claim 1, characterized in that: The first planetary mechanism is farther away from the engine (900) than the second planetary mechanism.

7. The dual-motor two-speed multi-mode hybrid transmission according to claim 1, characterized in that: The first planet carrier (330) and the second ring gear (440) are connected via a connecting frame (130).

8. A speed changing method, characterized in that: A dual-motor two-speed multi-mode hybrid transmission according to any one of claims 1 to 7 is applied, comprising the following steps: S1, the first clutch (610) and the second clutch (620) are engaged, all brakes are in a non-operating state, the main shaft (200) transmits a part of the power to the second sun gear (410) through the first clutch (610), and the other part of the power is transmitted to the second planetary carrier (430) through the second clutch (620), and the power is mixed in the second planetary gear (420) and then transmitted to the output gear through the second ring gear (440), so as to realize the transmission of a first gear ratio; S2, the second clutch (620) and the first brake (510) are engaged, the other clutches are in a disengaged state, the second brake (520) is in a non-operating state, the main shaft (200) transmits power to the second planetary carrier (430) through the second clutch (620), the first brake (510) fixes the first sun gear (310), the power is transmitted to the second ring gear (440) through the second planetary carrier (430), and the power is transmitted to the output gear through the second ring gear (440), so as to realize the transmission of the second gear ratio; S3, the second brake (520) is engaged, all clutches are in a disengaged state, the first brake (510) is not working, and the power of the first motor (700) is transmitted to the first ring gear (340), a part of the power transmitted from the first ring gear (340) is transmitted to the second ring gear (440) through the first planetary carrier (330), and the other part is transmitted to the second sun gear (410) through the first sun gear (310), and then transmitted from the second sun gear (410) to the second planetary gear (420), and then transmitted from the second planetary gear (420) to the second ring gear (440), and the power is transmitted to the output gear through the second ring gear (440) to realize the transmission of the first gear power of the electric drive; S4, the first brake (510) is engaged, the other clutches are in a disengaged state, the second brake (520) is not operated, the power of the first motor (700) is transmitted to the first ring gear (340), the power enters the first planetary gear (320), the first planetary gear (320) transmits the power from the first planetary carrier (330) to the second ring gear (440), and the second ring gear (440) transmits the power to the output gear, so as to realize the transmission of the electric drive second gear; S5, the first clutch (610) is engaged, the other clutches are in a disengaged state, the first brake (510) and the second brake (520) are not in operation, the power on the main shaft (200) is transmitted to the first sun gear (310) through the first clutch (610), the power of the first motor (700) is transmitted to the first ring gear (340), the power of the engine (900) and the power of the first motor (700) are mixed in the first planetary gear (320), and transmitted to the second ring gear (440) through the first planetary carrier (330), and the power is transmitted to the output gear through the second ring gear (440), so as to realize the transmission of power in EVT1 mode; S6, the second clutch (620) is engaged, the other clutches are in a disengaged state, the first brake (510) and the second brake (520) are not working, the power of the engine (900) is transmitted to the second clutch (620) through the main shaft (200), and then transmitted to the second planetary carrier (430) through the second clutch (620), the power of the first motor (700) is transmitted to the first ring gear (340), the first ring gear (340) transmits part of the power to the first planetary carrier (330), and the other part is transmitted to the second sun gear (410) through the first sun gear (310), and then transmitted from the second sun gear (410) to the second planetary gear (420), and after the second planetary gear (420) is mixed with the power of the engine (900), it is transmitted to the second ring gear (440), and the power is transmitted to the output gear through the second ring gear (440) to realize the power transmission in EVT2 mode.

Images