Power assembly, vehicle and vehicle control method

Abstract

The invention relates to a power assembly, a vehicle and a vehicle control method. The power assembly comprises an engine, a first motor, a planetary gear set, a first driving shaft, a first locking mechanism and a second locking mechanism. An output shaft of the engine is connected with a planet carrier of the planetary gear set; a main shaft of the first motor is connected with a sun gear of the planetary gear set; a gear ring of the planetary gear set is connected with the first driving shaft; the first driving shaft is suitable for being connected with a first wheel; the first locking mechanism is used for selectively locking the planet carrier on a first static component or releasing the locking between the planet carrier and the first static component; and the second locking mechanism is used for selectively locking the main shaft on a second static part or releasing the locking of the main shaft and the second static part. When the power is insufficient, the first wheel can be directly driven by the engine, so that the intermediate link of torque transmission can be reduced, and the energy loss is further reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile manufacturing, and in particular relates to a power assembly, a vehicle and a vehicle control method. Background Art

[0002] When a hybrid vehicle is out of power, the engine needs to first drive the first motor to generate electricity. The electricity generated by the first motor then needs to be transformed by the inverter and supplied to the second motor, and then the second motor drives the wheels to rotate. In other words, the driving force of the engine needs to pass through the first motor, the inverter and the second motor before it can be transmitted to the wheel end, which will result in low energy application efficiency and about 15% energy loss during actual work. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in view of the problem that in the case of low power, the driving force of the engine of existing hybrid vehicles needs to pass through the first motor, the inverter and the second motor before it can be transmitted to the wheel end, resulting in low energy application efficiency, a powertrain, a vehicle and a vehicle control method are provided.

[0004] In order to solve the above problems, on the one hand, the present invention provides a power assembly, including an engine, a first motor, a planetary gear set, a first drive shaft, a first locking mechanism and a second locking mechanism; the output shaft of the engine is connected to the planetary carrier of the planetary gear set; the main shaft of the first motor is connected to the sun gear of the planetary gear set; the ring gear of the planetary gear set is connected to the first drive shaft; the first drive shaft is suitable for connecting to a first wheel; the first locking mechanism is used to selectively lock the planetary carrier on a first stationary component or release the lock of the planetary carrier and the first stationary component; the second locking mechanism is used to selectively lock the main shaft on a second stationary component or release the lock of the main shaft and the second stationary component.

[0005] Optionally, the powertrain also includes a first transmission mechanism, and the output shaft is connected to the planetary carrier through the first transmission mechanism; the first transmission mechanism includes a first gear assembly and a selection unit; the first gear assembly includes a first driving wheel and a first driven wheel, the first driving wheel is connected to the output shaft, and the first driven wheel is connected to the planetary carrier; the selection unit connects the first driving wheel and the output shaft, and the selection unit has a switchable first state and a second state; when the selection unit is in the first state, the first driving wheel is separated from the output shaft; when the selection unit is in the second state, the first driving wheel is combined with the output shaft through the selection unit.

[0006] Optionally, the first transmission mechanism also includes a second gear assembly, the second gear assembly includes a second driving wheel and a second driven wheel, the second driving wheel is connected to the output shaft, and the first driven wheel is connected to the planetary carrier; when the selection unit is in a first state, the second driving wheel is coupled to the output shaft through the selection unit; when the selection unit is in a second state, the second driving wheel is separated from the output shaft.

[0007] Optionally, the first locking mechanism includes a first driving part and a first locking part, the first driving part is connected to the first locking part, and is used to drive the first locking part to approach or move away from the first driving wheel; when the first locking part is close to the first driving wheel, it can combine with the first driving wheel to lock the planetary carrier; when the first locking part is away from the first driving wheel, it can disengage from the first driving wheel to unlock the planetary carrier.

[0008] Optionally, the powertrain also includes a second motor and a second drive shaft, the second motor is electrically connected to the first motor, the motor shaft of the second motor is connected to the second drive shaft, and the second drive shaft is suitable for connecting to a second wheel; wherein, one of the first wheel and the second wheel is a front wheel, and the other is a rear wheel.

[0009] Optionally, the power drive system has a first direct drive mode and a second direct drive mode; when the power drive system is in the first direct drive mode, the first locking mechanism unlocks the planetary carrier, the second locking mechanism locks the main shaft, the selection unit is in the first state, the engine is working, the first motor is not working, and the second motor is not working; when the power drive system is in the second direct drive mode, the first locking mechanism unlocks the planetary carrier, the second locking mechanism locks the main shaft, the selection unit is in the second state, the engine is working, the first motor is not working, the second motor is not working, and the power drive system enters the second direct drive mode.

[0010] Optionally, the power drive system has a first power split mode, a power split two-wheel drive mode and a parallel mode; when the power drive system is in the first power split mode, the first locking mechanism unlocks the planetary carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the first state or the second state, the engine works to drive the first motor to generate electricity, and the second motor drives; when the power drive system is in the second power split mode, the first locking mechanism unlocks the planetary carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the first state or the second state, the engine works to drive the first motor to generate electricity, and the second motor does not work; when the power drive system is in the parallel mode, the first locking mechanism unlocks the planetary carrier, the second locking mechanism locks the main shaft, the selection unit is in the first state or the second state, the engine works, the first motor does not work, and the second motor drives.

[0011] Optionally, when the power drive system is in the first pure electric mode, the first locking mechanism locks the planetary carrier, the second locking mechanism unlocks the main shaft, the selection unit is in a third state, the engine does not work, the first motor drives, and the second motor drives; wherein, when the selection unit is in the third state, the first driving wheel is separated from the output shaft, and the second driving wheel is separated from the output shaft; when the power drive system is in the second pure electric mode, the first locking mechanism locks the planetary carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the third state, the engine does not work, the first motor drives, and the second motor does not work; when the power drive system is in the third pure electric mode, the first locking mechanism locks the planetary carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the third state, the engine does not work, the first motor does not work, and the second motor drives.

[0012] Optionally, when the power drive system is in the first energy recovery mode, the first locking mechanism unlocks the planetary carrier, the selection unit is in the third state, the engine does not work, the first motor does not work, and the second motor generates electricity; wherein, when the selection unit is in the third state, the first driving wheel is separated from the output shaft, and the second driving wheel is separated from the output shaft; when the power drive system is in the second energy recovery mode, the first locking mechanism unlocks the planetary carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the third state, the engine does not work, the first motor generates electricity, and the second motor does not work.

[0013] Optionally, in the radial direction of the output shaft, the axis of the output shaft and the axis of the planetary gear set are spaced apart; the power assembly further includes a first transmission mechanism, and the output shaft is connected to the planetary carrier via the first transmission mechanism.

[0014] Optionally, a locking hole is provided on the side of the main shaft; the second locking mechanism includes a second driving part and a second locking part; the second driving part is connected to the second locking part, and is used to drive the second locking part to approach or move away from the main shaft; when the first locking part approaches the main shaft, it can extend into the locking hole to lock the main shaft; when the first locking part moves away from the main shaft, it can withdraw from the locking hole to unlock the main shaft.

[0015] Optionally, the main shaft is loosely mounted on the first driving shaft.

[0016] Optionally, the powertrain also includes a second motor, a second drive shaft and a clutch device; the motor shaft of the second motor is connected to the second drive shaft; the second drive shaft is suitable for connecting to a second wheel; one of the first wheel and the second wheel is a front wheel and the other is a rear wheel; the output shaft is connected to the planetary carrier through the clutch device; the clutch device includes an active part and a driven part, the active part is connected to the output shaft, and the driven part is connected to the planetary carrier; the clutch device has a switchable engagement state and a disengagement state; when the clutch device is in the engagement state, the active part is engaged with the driven part so that the torque of the output shaft can be transmitted to the planetary carrier; when the clutch device is in the disengagement state, the active part and the driven part are separated to avoid the output shaft torque being transmitted to the planetary carrier.

[0017] In order to solve the above problems, on the one hand, the present invention provides a vehicle, comprising any one of the powertrains described above.

[0018] In order to solve the above problems, the present invention also provides a vehicle control method for controlling the operation of a vehicle having the above-mentioned powertrain, the vehicle control method comprising controlling the vehicle to operate in any one of a direct drive mode and a power split mode; when the vehicle operates in the direct drive mode, the engine operates, the clutch device is in an engaged state, the first locking mechanism unlocks the planetary carrier, the second locking mechanism locks the main shaft, and the first generator does not operate; when the vehicle operates in the power split mode, the engine operates, the clutch device is in an engaged state, the first locking mechanism unlocks the planetary carrier, the second locking mechanism unlocks the main shaft, and the first motor generates electricity.

[0019] Optionally, the vehicle control method also includes controlling the vehicle to switch from the power split mode to the direct drive mode; wherein, the step of controlling the vehicle to switch from the power split mode to the direct drive mode includes: controlling the second motor to operate so as to drive the second wheel by the second motor; controlling the clutch device to switch from the engaged state to the disengaged state; controlling the second locking mechanism to lock the main shaft; and controlling the clutch device to switch from the disengaged state to the engaged state.

[0020] Optionally, between the step of controlling the clutch device to switch from the engaged state to the disengaged state and the step of controlling the second locking mechanism to lock the main shaft, it also includes: controlling the main shaft to decelerate to a first target speed; and / or, between the step of controlling the second locking mechanism to lock the main shaft and the step of controlling the clutch device to switch from the disengaged state to the engaged state, it also includes: adjusting the rotational speed of the output shaft so that the rotational speed difference between the active part and the driven part satisfies a first predetermined value; and / or, after the step of controlling the clutch device to switch from the disengaged state to the engaged state, it also includes: controlling the second motor to stop working.

[0021] Optionally, the vehicle control method also includes controlling the vehicle to switch from the direct drive mode to the power split mode; wherein, the step of controlling the vehicle to switch from the direct drive mode to the power split mode includes: controlling the second motor to operate so as to drive the second wheel by the second motor; controlling the clutch device to switch from a engaged state to a disengaged state; controlling the second locking mechanism to unlock the main shaft; and controlling the clutch device to switch from the disengaged state to a engaged state.

[0022] Optionally, between the step of controlling the second locking mechanism to unlock the main shaft and the step of controlling the clutch device to switch from the disengaged state to the engaged state, it also includes: adjusting the rotational speed of the output shaft so that the rotational speed difference between the active part and the driven part satisfies a second predetermined value.

[0023] In the powertrain, vehicle and vehicle control method provided in the embodiments of the present invention, when the battery is low, the first wheel can be directly driven by the engine, thereby reducing the intermediate links of torque transmission and further reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a power assembly provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a power assembly provided by another embodiment of the present invention; Figure 3 A vehicle control method is provided by an embodiment of the present invention; Figure 4 This is another vehicle control method provided by an embodiment of the present invention.

[0025] The reference numerals in the specification are as follows: 10. Powertrain; 20. First wheel; 30. Second wheel; 40. Battery; 1. Engine; 11. Output shaft; 2. first motor; 21. main shaft; 211. locking hole; 22. locking block; 3. Planetary gear set; 31. Planet carrier; 32. Sun gear; 33. Ring gear; 4. The first drive shaft; 5. First locking mechanism; 51. First driving unit; 52. First locking unit; 6. Second locking mechanism; 61. Second driving unit; 62. Second locking unit; 7. First transmission mechanism; 71. First gear assembly; 711. First driving wheel; 712. First driven wheel; 72. Selection unit; 73. Second gear assembly; 731. Second driving wheel; 732. Second driven wheel; 81, second motor; 82, second drive shaft; 83, second transmission mechanism; 831, first gear; 832, second gear; 833, third gear; 834, fourth gear; 91. First differential; 92. Second differential. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] like Figure 1 As shown, in one embodiment, the powertrain 10 includes an engine 1, a first motor 2, a planetary gear set 3, a first drive shaft 4, a first locking mechanism 5 and a second locking mechanism 6; wherein the output shaft 11 of the engine 1 is connected to the planet carrier 31 of the planetary gear set 3; the main shaft 21 of the first motor 2 is connected to the sun gear 32 of the planetary gear set 3; the ring gear 33 of the planetary gear set 3 is connected to the first drive shaft 4; the first drive shaft 4 is suitable for connecting the first wheel 20; the first locking mechanism 5 is used to selectively lock the planet carrier 31 on the first stationary component or release the lock of the planet carrier 31 from the first stationary component; the second locking mechanism 6 is used to selectively lock the main shaft 21 on the second stationary component or release the lock of the main shaft 21 from the second stationary component.

[0028] The first stationary component may be a vehicle body, or the first stationary component may be an object mounted on the vehicle body and stationary relative to the vehicle body, such as a reducer housing, a housing of the engine 1, or a housing of the first motor 2. The planetary gear set 3 may be mounted in the reducer housing.

[0029] The second stationary component may be a vehicle body, or the second stationary component may be an object mounted on the vehicle body and capable of being stationary relative to the vehicle body, such as a reducer housing, a housing of the engine 1, or a housing of the first motor 2. In addition, the first stationary component and the second stationary component may be the same object or different objects.

[0030] When the first locking mechanism 5 releases the locking of the planet carrier 31 and the first stationary component (hereinafter simply referred to as the first locking mechanism 5 unlocking the planet carrier 31 ), the planet carrier 31 can rotate around the axis of the planetary gear set 3 .

[0031] When the first locking mechanism 5 locks the planet carrier 31 on the first stationary component (hereinafter referred to as the first locking mechanism 5 locking the planet carrier 31), the planet carrier 31 cannot rotate around the axis of the planetary gear set 3. At this time, the power of the engine 1 cannot be transmitted to the ring gear 33 and the sun gear 32.

[0032] When the second locking mechanism 6 releases the locking between the main shaft 21 and the second stationary component (hereinafter referred to as the second locking mechanism 6 unlocking the main shaft 21), the main shaft 21 can rotate around its own axis, and at this time, the sun gear 32 can rotate around its axis. The axis of the sun gear 32 is the axis of the planetary gear set 3.

[0033] When the second locking mechanism 6 locks the main shaft 21 on the second stationary component (hereinafter referred to as the second locking mechanism 6 locking the main shaft 21 ), the main shaft 21 cannot rotate around its own axis, and at this time, the sun gear 32 cannot rotate around its axis either.

[0034] In this embodiment, when the first locking mechanism 5 unlocks the planetary carrier 31 and the second locking mechanism 6 unlocks the main shaft 21, the torque of the engine 1 can be transmitted from the output shaft 11 to the planetary carrier 31, and then transmitted to the ring gear 33 through the planetary gears of the planetary gear set 3, and then transmitted from the ring gear 33 to the first drive shaft 4, and then transmitted to the first wheel 20, thereby driving the first wheel 20 to rotate around its own axis. Moreover, after the torque of the engine 1 is transmitted to the planetary carrier 31, it can also be transmitted from the planetary carrier 31 to the sun gear 32, and then from the sun gear 32 to the main shaft 21, thereby driving the main shaft 21 to rotate, and at this time, the first motor 2 can generate electricity.

[0035] That is, when the first locking mechanism 5 unlocks the planetary carrier 31 and the second locking mechanism 6 unlocks the main shaft 21, the torque of the engine 1 can be diverted through the planetary gear set 3, part of which is used to drive the first wheel 20 to rotate, and another part of which is used to drive the first motor 2 to generate electricity.

[0036] When the first locking mechanism 5 unlocks the planetary carrier 31 and the second locking mechanism 6 locks the main shaft 21, the torque of the engine 1 can be transmitted from the output shaft 11 to the planetary carrier 31, and then transmitted to the ring gear 33 through the planetary gear of the planetary gear set 3, and then transmitted from the ring gear 33 to the first drive shaft 4, and then transmitted to the first wheel 20, thereby driving the first wheel 20 to rotate around its own axis. Moreover, after the torque of the engine 1 is transmitted to the planetary carrier 31, it cannot drive the main shaft 21 to rotate, and the engine 1 can directly drive the first wheel 20. When the power is low, the first wheel 20 can be directly driven by the engine 1, thereby reducing the intermediate links of torque transmission and reducing energy loss.

[0037] When the first locking mechanism 5 locks the planetary carrier 31 and the second locking mechanism 6 unlocks the main shaft 21, the first wheel 20 cannot be driven by the engine 1. At this time, the first motor 2 can work and generate driving force, and its driving force can be transmitted from the main shaft 21 to the sun gear 32, and then to the planetary gear, and then to the first drive shaft 4 through the ring gear 33, thereby driving the first wheel 20 to rotate.

[0038] It should be noted that the output shaft 11 may be only a part of the engine 1, or, in addition to a part belonging to the engine 1 (defined as the first partial shaft), the output shaft 11 also has a second partial shaft independent of the engine 1, the first partial shaft is connected to the second partial shaft, and the two may be coaxially arranged, which is equivalent to lengthening the original output shaft of the engine (i.e., the first partial shaft).

[0039] The main shaft 21 may be only a part of the first motor 2, or, in addition to a part belonging to the first motor 2 (defined as the third partial shaft), the main shaft 21 also has a fourth partial shaft independent of the first motor 2. The third partial shaft is connected to the fourth partial shaft, and the two may be coaxially arranged. In this case, it is equivalent to lengthening the original main shaft (i.e., the third partial shaft) of the first motor 2.

[0040] like Figure 1 As shown, in one embodiment, in the radial direction of the output shaft 11, the axis of the output shaft 11 and the axis of the planetary gear set are spaced apart, that is, the output shaft 11 and the planetary gear set are not coaxial; the power assembly 10 further includes a first transmission mechanism 7, and the output shaft 11 is connected to the planet carrier 31 through the first transmission mechanism 7. In this way, the size of the power assembly 10 in the axial direction of the output shaft 11 can be reduced.

[0041] like Figure 1 As shown, in one embodiment, the first transmission mechanism 7 includes a first gear assembly 71 and a selection unit 72; the first gear assembly 71 includes a first driving wheel 711 and a first driven wheel 712, the first driving wheel 711 is connected to the output shaft 11, and the first driven wheel 712 is connected to the planetary carrier 31; the selection unit 72 connects the first driving wheel 711 and the output shaft 11, and the selection unit 72 has a switchable first state and a second state; when the selection unit 72 is in the first state, the first driving wheel 711 is separated from the output shaft 11; when the selection unit 72 is in the second state, the first driving wheel 711 is coupled to the output shaft 11 through the selection unit 72.

[0042] When the first driving wheel 711 is separated from the output shaft 11, the torque output by the engine 1 cannot be transmitted to the first driving wheel 711. When the first driving wheel 711 is coupled to the output shaft 11 through the selection unit 72, the torque output by the engine 1 can be transmitted to the first driving wheel 711 through the selection unit 72, and then transmitted to the first driven wheel 712 through the first driving wheel 711, and then transmitted to the planet carrier 31 from the first driven wheel 712.

[0043] The first driving wheel 711 and the first driven wheel 712 are both gears, and the first driving wheel 711 and the first driven wheel 712 can be directly meshed, so that the torque on the first driving wheel 711 can be directly transmitted to the first driven wheel 712. Of course, when the first driving wheel 711 and the first driven wheel 712 are both gears, the first driving wheel 711 and the first driven wheel 712 may not be directly meshed. In this case, the first gear set also includes an intermediate gear, which is arranged between the first driving wheel 711 and the first driven wheel 712. When working, the torque of the first driving wheel 711 is first transmitted to the intermediate gear, and then transmitted from the intermediate gear to the first driven wheel 712. In addition, the number of intermediate gears can be one, in which case the first driving wheel 711 and the first driven wheel 712 are both meshed with the intermediate gear; or the number of intermediate gears can be multiple, and the torque of the first driving wheel 711 can be transmitted to the first driven wheel 712 after passing through each intermediate gear in sequence.

[0044] "Multiple" means greater than or equal to two, and the word "multiple" has the same meaning in each embodiment and will not be repeated in the following text.

[0045] In one embodiment, the first driving wheel 711 is loosely mounted on the output shaft 11 , and the selection unit 72 may be a synchronizer. The synchronizer is used in the prior art to combine or separate the first driving wheel 711 and the output shaft 11 .

[0046] In addition, the first driven wheel 712 and the planet carrier 31 may be fixedly connected, and the first driven wheel 712 and the planet carrier 31 are coaxially arranged, and the two may rotate synchronously around the axis of the first driven wheel 712 .

[0047] like Figure 1 As shown, in one embodiment, the first transmission mechanism 7 also includes a second gear assembly 73, the second gear assembly 73 includes a second driving wheel 731 and a second driven wheel 732, the second driving wheel 731 is connected to the output shaft 11, and the second driven wheel 732 is connected to the planetary carrier 31; when the selection unit 72 is in the first state, the second driving wheel 731 is coupled to the output shaft 11 through the selection unit 72; when the selection unit 72 is in the second state, the second driving wheel 731 is separated from the output shaft 11.

[0048] When the second driving wheel 731 is separated from the output shaft 11, the torque output by the engine 1 cannot be transmitted to the second driving wheel 731. When the second driving wheel 731 is coupled to the output shaft 11 through the selection unit 72, the torque output by the engine 1 can be transmitted to the second driving wheel 731 through the selection unit 72, and then transmitted to the second driven wheel 732 through the second driving wheel 731, and then transmitted to the planet carrier 31 from the second driven wheel 732.

[0049] The second driving wheel 731 and the second driven wheel 732 are both gears, and the second driving wheel 731 and the second driven wheel 732 can be directly meshed, so that the torque on the second driving wheel 731 can be directly transmitted to the second driven wheel 732. Of course, when the second driving wheel 731 and the second driven wheel 732 are both gears, the second driving wheel 731 and the second driven wheel 732 may not be directly meshed. In this case, the second gear set 73 also includes an intermediate gear, which is arranged between the second driving wheel 731 and the second driven wheel 732. When working, the torque of the second driving wheel 731 is first transmitted to the intermediate gear, and then transmitted from the intermediate gear to the second driven wheel 732. In addition, the number of intermediate gears can be one, in which case the second driving wheel 731 and the second driven wheel 732 are both meshed with the intermediate gear; or the number of intermediate gears can be multiple, and the torque of the second driving wheel 731 can be transmitted to the second driven wheel 732 after passing through each intermediate gear in sequence.

[0050] During operation, when the engine 1 needs to output torque to the planetary carrier 31 through the first gear assembly 71, the selection unit 72 can be switched to the second state; when the engine 1 needs to output torque to the planetary carrier 31 through the second gear assembly 73, the selection unit 72 can be switched to the first state.

[0051] In addition, the transmission ratio of the first gear assembly 71 and the transmission ratio of the second gear assembly 73 can be different, so that the engine 1 can achieve two-speed output. Of course, in some embodiments, the transmission ratio of the first gear assembly 71 and the transmission ratio of the second gear assembly 73 can be the same.

[0052] In one embodiment, the second driving wheel 731 is also loosely mounted on the output shaft 11 , and the selection unit 72 is located between the first driving wheel 711 and the second driving wheel 731 .

[0053] In addition, the selection unit 72 also has a third state. When the selection unit 72 is in the third state, the first driving wheel 711 is separated from the output shaft 11, and the second driving wheel 731 is separated from the output shaft 11. At this time, the torque of the engine 1 cannot be transmitted from the output shaft 11 to the first driving wheel 711 or the second driving wheel 731, and further cannot be transmitted to the planet carrier 31.

[0054] like Figure 1 As shown, the first locking mechanism 5 includes a first driving part 51 and a first locking part 52. The first driving part 51 is connected to the first locking part 52 and is used to drive the first locking part 52 to approach or move away from the first driving wheel 711. When the first locking part 52 approaches the first driving wheel 711, it can be combined with the first driving wheel 711 to lock the planetary carrier 31. When the first locking part 52 moves away from the first driving wheel 711, it can be disengaged from the first driving wheel 711 to unlock the planetary carrier 31.

[0055] That is, the first locking mechanism 5 locks the planet carrier 31 by locking the first driving wheel 711 , which makes it easier to assemble the power assembly 10 .

[0056] The first locking portion 52 may have a latching tooth that can mesh with the first driving wheel 711 . When the first locking portion 52 is close to the first driving wheel 711 , the latching tooth can mesh with the first driving wheel 711 , thereby locking the first driving wheel 711 .

[0057] In one embodiment, the first driving part 51 may include a first electromagnetic unit and a first elastic unit, and the first locking part 52 has a permanent magnetic unit. When the first electromagnetic unit is not powered on, the first locking part 52 is in a state away from the first driving wheel 711 under the action of the first elastic unit. At this time, the first driving wheel 711 is not locked by the first locking part 52, and can rotate around its own axis. When the first electromagnetic unit is powered on, its magnetism may be the same as that of the first locking part 52, and then drive the first locking part 52 to move close to the first driving wheel 711 until the first locking part 52 locks the first driving wheel 711. In this process, the first locking part 52 can apply force to the first elastic unit to cause the first elastic unit to produce elastic deformation. After the first electromagnetic unit is powered off, the first locking part 52 can be reset under the deformation force of the first elastic unit to move away from the first driving wheel 711, so that the first locking part 52 is separated from the first driving wheel 711. In this embodiment, the first electromagnetic unit may be located at a side of the first locking portion 52 away from the first driving wheel 711 , and the first elastic unit may abut against a side of the first locking portion 52 close to the first driving wheel 711 .

[0058] In other embodiments, when the first electromagnetic unit is not powered on, the first locking portion 52 is in a state of approaching and locking the first driving wheel 711 under the action of the first elastic unit; and when the first electromagnetic unit is powered on, the first locking portion 52 can be driven to move away from the first driving wheel 711 until the first driving wheel 711 is unlocked. During this process, the first locking portion 52 can apply force to the first elastic unit to cause the first elastic unit to produce elastic deformation. After the first electromagnetic unit is powered off, the first locking portion 52 can be reset under the action of the deformation force of the first elastic unit to approach the first driving wheel 711, thereby causing the first locking portion 52 to lock the first driving wheel 711. In this embodiment, the first electromagnetic unit can be located on the side of the first locking portion 52 away from the first driving wheel 711, and the first elastic unit can be in contact with the side of the first locking portion 52 away from the first driving wheel 711.

[0059] The first driving part 51 may be connected to the first stationary component. Moreover, the first locking mechanism 5 may also adopt other existing designs to achieve locking and unlocking of the planet carrier 31. For example, the first locking mechanism 5 may be a corresponding brake in the prior art.

[0060] like Figure 1 As shown, in one embodiment, a locking hole 211 is provided on the side of the main shaft 21; the second locking mechanism 6 includes a second driving portion 61 and a second locking portion 62; the second driving portion 61 is connected to the second locking portion 62, and is used to drive the second locking portion 62 to approach or move away from the main shaft 21; when the second locking portion 62 approaches the main shaft 21, it can extend into the locking hole 211 to lock the main shaft 21; when the second locking portion 62 moves away from the main shaft 21, it can withdraw from the locking hole 211 to unlock the main shaft 21.

[0061] In one embodiment, the second driving part 61 may include a second electromagnetic unit and a second elastic unit, and the second locking part 62 has a permanent magnetic unit. When the second electromagnetic unit is not powered on, the second locking part 62 is in a state away from the main shaft 21 under the action of the second elastic unit. At this time, the second locking part 62 is located outside the locking hole 211, and the main shaft 21 is not locked by the second locking part 62, and can rotate around its own axis. When the second electromagnetic unit is powered on, its magnetism may be the same as that of the second locking part 62, and then drive the second locking part 62 to move close to the main shaft 21 until the second locking part 62 extends into the locking hole 211, and in this process, the second locking part 62 can apply force to the second elastic unit to cause the second elastic unit to produce elastic deformation. After the second electromagnetic unit is powered off, it can be away from the main shaft 21 under the action of the deformation force of the second elastic unit, and finally the second locking part 62 is reset, and then the second locking part 62 is separated from the main shaft 21. In this embodiment, the second electromagnetic unit may be located at a side of the second locking portion 62 away from the main shaft 21 , and the second elastic unit may abut against a side of the second locking portion 62 close to the main shaft 21 .

[0062] In other embodiments, when the second electromagnetic unit is not powered on, the second locking portion 62 is in a state of approaching and locking the main shaft 21 under the action of the second elastic unit (at this time, the second locking portion 62 extends into the locking hole 211); and when the second electromagnetic unit is powered on, the second locking portion 62 can be driven to move away from the main shaft 21 until the main shaft 21 is unlocked. During this process, the second locking portion 62 can apply force to the second elastic unit to cause the second elastic unit to produce elastic deformation. After the second electromagnetic unit is powered off, the second locking portion 62 can be reset under the deformation force of the second elastic unit to approach the main shaft 21, thereby causing the second locking portion 62 to lock the main shaft 21. In this embodiment, the second electromagnetic unit can be located on the side of the second locking portion 62 away from the main shaft 21, and the second elastic unit can be in contact with the side of the second locking portion 62 away from the main shaft 21.

[0063] The second driving part 61 may be connected to a corresponding supporting object. For example, the second driving part 61 may be connected to a corresponding supporting object for supporting and placing the first motor 2 .

[0064] Of course, the second locking mechanism 6 may also be of other existing designs to achieve locking and unlocking of the main shaft 21. For example, the second locking mechanism 6 may be a corresponding brake in the prior art.

[0065] like Figure 1 As shown, in one embodiment, a locking block 22 is provided on the main shaft 21, and a locking hole 211 is provided on the locking block 22. The locking block 22 may be sleeved on the main shaft 21, and the locking block 22 may be fixed on the main shaft 21 by bolts or the like.

[0066] Of course, in other embodiments, the locking block 22 may not be provided. In this case, the locking hole 211 may be directly provided on the main shaft 21 .

[0067] like Figure 1 As shown, in one embodiment, the main shaft 21 is sleeved on the first drive shaft 4, and the two can be coaxially arranged. At this time, the first motor 2 is also sleeved on the first drive shaft 4, and both ends of the first drive shaft 4 pass through the first motor 2. This arrangement can make the entire powertrain 10 more integrated.

[0068] Of course, in other embodiments, the main shaft 21 may not be sleeved on the first driving shaft 4, and the main shaft 21 and the first driving shaft 4 may be arranged side by side.

[0069] like Figure 1 As shown, in one embodiment, the powertrain 10 also includes a second motor 81 and a second drive shaft 82; the second motor 81 is electrically connected to the first motor 2; the motor shaft of the second motor 81 is connected to the second drive shaft 82; the second drive shaft 82 is suitable for connecting to the second wheel 30; wherein, one of the first wheel 20 and the second wheel 30 is a front wheel, and the other of the first wheel 20 and the second wheel 30 is a rear wheel.

[0070] In this embodiment, the powertrain is a four-wheel drive system, the power of the engine 1 and / or the first motor 2 can drive the first wheel 20, and the power of the second motor 81 can drive the second wheel 30. Usually, the first wheel 20 is the front wheel, and the second wheel 30 is the rear wheel.

[0071] In addition, the second drive shaft 82 and the second wheel 30 may be coaxially arranged.

[0072] In addition, the second motor 81 is electrically connected to the first motor 2 , so that the electric energy generated by the first motor 2 can be directly used to drive the second motor 81 , and the electric energy generated by the second motor 81 can also be directly used to drive the first motor 2 .

[0073] like Figure 1 As shown, in one embodiment, the motor shaft is sleeved on the second drive shaft 82, and the two can be coaxially arranged. At this time, the second motor 81 is also sleeved on the second drive shaft 82, and both ends of the second drive shaft 82 pass through the second motor 81. This arrangement can make the entire power assembly 10 more integrated.

[0074] like Figure 1 As shown, in one embodiment, the power assembly 10 further includes a second transmission mechanism 83 , and the second transmission mechanism 83 connects the motor shaft of the second motor 81 and the second drive shaft 82 .

[0075] Specifically, the second transmission mechanism 83 includes a first gear 831, a second gear 832, a third gear 833, a fourth gear 834 and a gear shaft, wherein the first gear 831 is connected to the motor shaft, the first gear 831 is meshed with the second gear 832, the second gear 832 and the third gear 833 are both connected to the gear shaft, the fourth gear 834 is connected to the second drive shaft 82, and the fourth gear 834 is meshed with the third gear 833. In addition, in the axial direction of the motor shaft, the first gear 831 is spaced apart from the third gear 833 and the fourth gear 834, and the second gear 832 is spaced apart from the third gear 833 and the fourth gear 834.

[0076] Of course, in other embodiments, the third gear 833 and the fourth gear 834 may also be an integral structure.

[0077] Of course, in other embodiments, the motor shaft may not be sleeved on the second drive shaft 82, and the motor shaft and the second drive shaft 82 may be arranged side by side.

[0078] In one embodiment, when the powertrain 10 includes components such as an engine 1, a first motor 2, a planetary gear set 3, a first transmission mechanism 7, a first locking mechanism 5, a second locking mechanism 6 and a second motor 81, the powertrain 10 has at least one of a first direct drive mode, a second direct drive mode, a first power split mode, a second power split mode, a parallel mode, a first pure electric mode, a second pure electric mode, a third pure electric mode, a first energy recovery mode and a second energy recovery mode.

[0079] When the power drive system is in the first direct drive mode, the first locking mechanism 5 unlocks the planet carrier 31, the second locking mechanism 6 locks the main shaft 21, the selection unit 72 is in the first state, the engine 1 is working, the first motor 2 is not working, and the second motor 81 is not working. The first motor 2 is not working means that the first motor 2 is neither used for power generation nor for driving. The second motor 81 is not working means that the second motor 81 is neither used for power generation nor for driving.

[0080] When the power drive system is in the second direct drive mode, the first locking mechanism 5 unlocks the planetary carrier 31, the second locking mechanism 6 locks the main shaft 21, the selection unit 72 is in the second state, the engine 1 is working, the first motor 2 is not working, the second motor 81 is not working, and the power drive system enters the second direct drive mode.

[0081] When the power drive system is in the first power split mode, the first locking mechanism 5 unlocks the planetary carrier 31, the second locking mechanism 6 unlocks the main shaft 21, the selection unit 72 is in the first state or the second state, the engine 1 works to drive the first motor 2 to generate electricity, and the second motor 81 drives.

[0082] When the first motor 2 generates electricity, the second locking mechanism 6 unlocks the main shaft 21, and the first motor 2 does not provide power to the outside. The main shaft 21 of the first motor 2 can rotate under the action of external force (such as the driving force of the engine 1 and / or the second motor 81), and the power generation circuit where the first motor 2 is located is a closed loop, so that the electric energy generated by the first motor 2 can be output to the outside (for example, output to the battery to charge the battery).

[0083] In some scenarios, when the second locking mechanism 6 unlocks the main shaft 21, the first motor 2 does not provide power to the outside, and the main shaft 21 of the first motor 2 can rotate under the action of external force, if the power generation circuit where the first motor 2 is located is disconnected, the first motor 2 can generate voltage but cannot output electrical energy to the outside, so the first motor 2 is also considered to be in a non-working state. Whether the second motor 81 is in a power generation state or in a non-working state is also distinguished in this way.

[0084] In actual use, the first motor 2 and the second motor 81 may be in the power generation state at the same time, or neither of them is in the power generation state, or only one of them is in the power generation state.

[0085] In addition, when the second locking mechanism 6 locks the main shaft 21, the first motor 2 is also in a non-working state.

[0086] When the power drive system is in the second power split mode, the first locking mechanism 5 unlocks the planetary carrier 31, the second locking mechanism 6 unlocks the main shaft 21, the selection unit 72 is in the first state or the second state, the engine 1 works to drive the first motor 2 to generate electricity, and the second motor 81 does not work.

[0087] When the power drive system is in parallel mode, the first locking mechanism 5 unlocks the planetary carrier 31, the second locking mechanism 6 locks the main shaft 21, the selection unit 72 is in the first state or the second state, the engine 1 is working, the first motor 2 is not working, and the second motor 81 is driving.

[0088] When the power drive system is in the first pure electric mode, the first locking mechanism 5 locks the planetary carrier 31, the second locking mechanism 6 unlocks the main shaft 21, the selection unit 72 is in the third state, the engine 1 does not work, the first motor 2 drives, and the second motor 81 drives; wherein, when the selection unit 72 is in the third state, the first driving wheel 711 is separated from the output shaft 11, and the second driving wheel 731 is separated from the output shaft 11.

[0089] When the power drive system is in the second pure electric mode, the first locking mechanism 5 locks the planetary carrier 31, the second locking mechanism 6 unlocks the main shaft 21, the selection unit 72 is in the third state, the engine 1 does not work, the first motor 2 drives, and the second motor 81 does not work.

[0090] When the power drive system is in the third pure electric mode, the first locking mechanism 5 locks the planetary carrier 31, the second locking mechanism 6 unlocks the main shaft 21, the selection unit 72 is in the third state, the engine 1 does not work, the first motor 2 does not work, and the second motor 81 drives.

[0091] When the power drive system is in the first energy recovery mode, the first locking mechanism 5 unlocks the planet carrier 31, the second locking mechanism 6 unlocks the main shaft 21 (refer to the table below), the selection unit 72 is in the third state, the engine 1 does not work, the first motor 2 does not work (at this time, the power generation circuit where the first motor 2 is located is disconnected), and the second motor 81 generates electricity. Of course, in this mode, the second locking mechanism 6 can also lock the main shaft 21.

[0092] When the power drive system is in the second energy recovery mode, the first locking mechanism 5 unlocks the planetary carrier 31, the second locking mechanism 6 unlocks the main shaft 21, the selection unit 72 is in the third state, the engine 1 does not work, the first motor 2 generates electricity, and the second motor 81 does not work (at this time, the power generation circuit where the second motor 81 is located is open).

[0093] In addition, the powertrain 10 may operate according to the logic in the following table.

[0094] like Figure 1 As shown, in one embodiment, the power assembly 10 further includes a first differential 91, the ring gear is connected to the input end of the first differential 91, and the output end of the first differential 91 is connected to the first drive shaft, that is, the first drive shaft is connected to the ring gear through the first differential 91. It should be understood that the first drive shaft may include two half shafts, both of which may be connected to the output end of the first differential 91, and both of which are connected to a first wheel 20. The two wheels connected to the two half shafts may be a left front wheel and a right front wheel, respectively.

[0095] like Figure 1 As shown, in one embodiment, the power assembly 10 further includes a second differential 92, the motor shaft is connected to the input end of the second differential 92, and the output end of the second differential 92 is connected to the second drive shaft, that is, the second drive shaft is connected to the motor shaft through the second differential 92. Specifically, the motor shaft is connected to the input end of the second differential 92 through a second transmission mechanism. It should be understood that the second drive shaft may include two half shafts, both of which may be connected to the output end of the second differential 92, and the two half shafts are respectively connected to a second wheel 30. The two wheels connected to the two half shafts may be a left rear wheel and a right rear wheel, respectively.

[0096] An embodiment of the present invention further provides a vehicle, which includes the powertrain 10 described in any one of the above embodiments.

[0097] like Figure 1As shown, the vehicle also has a battery 40, which is electrically connected to the first motor 2 and the second motor 81. The battery 40 can supply power to the first motor 2 and the second motor 81, and the first motor 2 and the second motor 81 can also charge the battery 40 when generating electricity, thereby storing the generated electrical energy in the battery 40.

[0098] It should be understood that the above-mentioned related designs can also be replaced by other methods, such as: refer to Figure 2 In other embodiments, the first transmission mechanism 7 may not include the second gear assembly 73. In this case, the engine 1 only transmits the output torque to the planetary carrier 31 through the first gear assembly 71. In addition, in this embodiment, the selection unit 72 may also be a clutch or the like.

[0099] In other embodiments, when the power assembly 10 includes the second motor 81 and the second drive shaft 82, the power assembly 10 may further include a clutch device 84 (see Figure 2 ); wherein the clutch device 84 includes an active part and a driven part, the active part is connected to the output shaft, and the driven part is connected to the planet carrier 31; the clutch device 84 has a switchable engagement state and a disengagement state; when the clutch device 84 is in the engagement state, the active part is combined with the driven part, so that the torque of the output shaft 11 can be transmitted to the planet carrier 31; when the clutch device 84 is in the disengagement state, the active part and the driven part are separated to avoid the torque of the output shaft 11 from being transmitted to the planet carrier 31.

[0100] The clutch device 84 may be a clutch independent of the selection unit 72, and the clutch may adopt an existing design. Alternatively, the clutch device 84 may also be the selection unit 72 described above.

[0101] When the clutch device 84 is the aforementioned selection unit 72, the clutch device 84 being in the disengaged state means that the selection unit 72 is in the third state; when the clutch device 84 is the aforementioned selection unit 72, the clutch device 84 being in the engaged state means that the selection unit 72 is in the first state or the second state.

[0102] An embodiment of the present invention also provides a vehicle control method, which is used to control the operation of a vehicle having the above-mentioned power assembly 10, and the vehicle control method includes controlling the vehicle to operate in any one of a direct drive mode and a power split mode; wherein, when the vehicle operates in the direct drive mode, the engine 1 operates, the clutch device 84 is in a coupled state, the first locking mechanism 5 unlocks the planetary carrier 31, the second locking mechanism 6 locks the main shaft 21, and the first motor 2 does not operate; when the vehicle operates in the power split mode, the engine 1 operates, the clutch device 84 is in a coupled state, the first locking mechanism 5 unlocks the planetary carrier 31, the second locking mechanism 6 unlocks the main shaft 21, and the first motor 2 generates electricity.

[0103] In one embodiment, the vehicle control method also includes controlling the vehicle to switch from a power split mode to a direct drive mode; wherein, the step of controlling the vehicle to switch from a power split mode to a direct drive mode includes: S1, controlling the second motor 81 to operate so as to drive the second wheel through the second motor 81; S2, controlling the clutch device 84 to switch from a coupled state to a disengaged state; S3, controlling the second locking mechanism 6 to lock the main shaft 21; S4, controlling the clutch device 84 to switch from a disengaged state to a coupled state.

[0104] When the clutch device 84 is switched to the disengaged state, the power of the engine 1 cannot be transmitted to the first wheel, and the vehicle will experience a power interruption. In this embodiment, before the clutch device 84 is switched to the disengaged state, the second motor 81 is controlled to work so that the second motor 81 can provide power to the vehicle, thereby avoiding a power interruption of the vehicle after the clutch device 84 is switched to the disengaged state, thereby improving the driving safety of the vehicle.

[0105] In one embodiment, between the step of controlling the clutch device 84 to switch from the engaged state to the disengaged state and the step of controlling the second locking mechanism 6 to lock the main shaft 21 (ie, between S2 and S3), it also includes: S5, controlling the main shaft 21 to decelerate to the first target speed.

[0106] That is, before the spindle 21 of the first motor 2 is locked by the second locking mechanism 6, the first motor 2 is first decelerated, thereby reducing the rotation speed of the spindle 21, and when the rotation speed of the spindle 21 is reduced to the first target speed, the second locking mechanism 6 is controlled to operate to lock the spindle 21. In this way, damage to components such as the spindle 21 and the second locking mechanism 6 can be avoided, and the service life of the power assembly 10 can be improved.

[0107] The first target speed is usually 0 or close to 0. For example, the first target speed may be less than or equal to 10 rpm. Moreover, the smaller the rotation speed of the main shaft 21 is, the more conducive it is for the second locking mechanism 6 to lock the main shaft 21 .

[0108] In addition, the rotation speed of the main shaft 21 can be detected by a corresponding angle sensor.

[0109] In one embodiment, when the vehicle is operating in the power split mode, the first motor 2 is in a power generation state, and the first motor 2 does not provide driving force to the outside at this time, but the main shaft 21 of the first motor 2 rotates together with the sun gear 32. At this time, the main shaft 21 of the first motor 2 is defined to rotate in the forward direction. In order to reduce the speed of the first motor 2, the first motor 2 can be powered to generate a driving force that can drive the main shaft 21 to rotate in the reverse direction, so that the main shaft 21 of the first motor 2 can be quickly reduced to the first target speed.

[0110] In one embodiment, between the step of controlling the second locking mechanism 6 to lock the main shaft 21 and the step of controlling the clutch device 84 to switch from the disengaged state to the engaged state (i.e., between S3 and S4), it also includes: S6, adjusting the rotational speed of the output shaft so that the rotational speed difference between the active part and the driven part satisfies the first predetermined value.

[0111] That is, when combining the active part and the driven part, the speed of the output shaft of the engine 1 is first adjusted so that the speed difference between the active part and the driven part meets the first predetermined value, thereby ensuring that the active part and the driven part can be combined smoothly and avoiding damage to components such as the clutch device 84 caused by the combination of the two.

[0112] The first predetermined value is usually 0 or close to 0. For example, the first predetermined value may be less than or equal to 10 rpm. Moreover, the closer the rotation speed of the active part is to the rotation speed of the driven part, the more conducive it is to combine the two.

[0113] In addition, the rotation speed of the active part and the rotation speed of the driven part can both be detected by corresponding angle sensors.

[0114] In addition, after assembly, the active part usually rotates synchronously with the output shaft, and the active part can be fixed on the output shaft, or the active part and the output shaft can also transmit power through gear meshing, thereby achieving synchronous motion. The driven part and the planet carrier 31 can rotate synchronously, and the driven part can be fixed on the planet carrier 31, or the driven part and the planet carrier 31 can also transmit power through gear meshing, thereby achieving synchronous motion.

[0115] In one embodiment, after the step of controlling the clutch device 84 to switch from the disengaged state to the engaged state (that is, after S4), the process further includes: S7, controlling the second motor 81 to stop working. In this way, the second motor 81 will not provide driving force to the vehicle, thereby saving electric energy.

[0116] In one embodiment, the vehicle control method further includes controlling the vehicle to switch from a direct drive mode to a power split mode.

[0117] Among them, the steps of controlling the vehicle to switch from the direct drive mode to the power split mode include: S1', controlling the second motor 81 to work so as to drive the second wheel through the second motor 81; S2', controlling the clutch device 84 to switch from the engaged state to the disengaged state; S3', controlling the second locking mechanism 6 to unlock the main shaft 21; S4', controlling the clutch device 84 to switch from the disengaged state to the engaged state.

[0118] In this embodiment, before the clutch device 84 switches to the disengaged state, the second motor 81 is controlled to operate so as to provide power to the vehicle through the second motor 81, thereby avoiding power interruption of the vehicle after the clutch device 84 switches to the disengaged state and improving the safety of vehicle driving.

[0119] In one embodiment, between the step of controlling the second locking mechanism 6 to unlock the main shaft 21 and the step of controlling the clutch device 84 to switch from the disengaged state to the engaged state (i.e., between S3' and S4'), it also includes: S5', adjusting the rotational speed of the output shaft so that the rotational speed difference between the active part and the driven part satisfies the second predetermined value.

[0120] This can ensure that the active part and the driven part can be combined smoothly, and avoid damage to components such as the clutch device 84 caused by the combination of the two.

[0121] The second predetermined value is usually 0 or close to 0. For example, the second predetermined value may be less than or equal to 10 rpm. Moreover, the closer the rotation speed of the active part is to the rotation speed of the driven part, the more conducive it is to combine the two.

[0122] In addition, the second predetermined value may be the same as or different from the first predetermined value.

[0123] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A powertrain, characterized in that: It includes an engine, a first motor, a planetary gear set, a first drive shaft, a first locking mechanism and a second locking mechanism; The output shaft of the engine is connected to the planet carrier of the planetary gear set; The main shaft of the first motor is connected to the sun gear of the planetary gear set; The ring gear of the planetary gear set is connected to the first drive shaft; The first drive shaft is suitable for connecting to a first wheel; The first locking mechanism is used to selectively lock the planet carrier on the first stationary component or unlock the planet carrier from the first stationary component; The second locking mechanism is used to selectively lock the main shaft on the second stationary component or release the locking between the main shaft and the second stationary component.

2. The powertrain according to claim 1, characterized in that: The power assembly further includes a first transmission mechanism, and the output shaft is connected to the planet carrier through the first transmission mechanism; The first transmission mechanism includes a first gear assembly and a selection unit; The first gear assembly includes a first driving wheel and a first driven wheel, the first driving wheel is connected to the output shaft, and the first driven wheel is connected to the planet carrier; The selection unit is connected to the first driving wheel and the output shaft, and the selection unit has a switchable first state and a second state; When the selection unit is in the first state, the first driving wheel is separated from the output shaft; When the selection unit is in the second state, the first driving wheel is coupled to the output shaft through the selection unit.

3. The powertrain according to claim 2, characterized in that: The first transmission mechanism further includes a second gear assembly, the second gear assembly includes a second driving wheel and a second driven wheel, the second driving wheel is connected to the output shaft, and the first driven wheel is connected to the planet carrier; When the selection unit is in the first state, the second driving wheel is coupled to the output shaft through the selection unit; When the selection unit is in the second state, the second driving wheel is separated from the output shaft.

4. The powertrain according to claim 3, characterized in that: The first locking mechanism includes a first driving part and a first locking part, wherein the first driving part is connected to the first locking part and is used to drive the first locking part to move closer to or away from the first driving wheel; When the first locking portion is close to the first driving wheel, it can be combined with the first driving wheel to lock the planet carrier; When the first locking portion is away from the first driving wheel, it can be disengaged from the first driving wheel to unlock the planet carrier.

5. The powertrain according to claim 1, characterized in that: In the radial direction of the output shaft, the axis of the output shaft and the axis of the planetary gear set are arranged at a distance; The power assembly further includes a first transmission mechanism, and the output shaft is connected to the planet carrier via the first transmission mechanism.

6. The powertrain according to claim 1, characterized in that: A locking hole is provided on the side of the main shaft; The second locking mechanism includes a second driving portion and a second locking portion; The second driving portion is connected to the second locking portion, and is used to drive the second locking portion to move closer to or away from the main shaft; When the second locking portion is close to the main shaft, it can extend into the locking hole to lock the main shaft; When the second locking portion is away from the main shaft, it can exit the locking hole to unlock the main shaft.

7. The powertrain according to claim 1, characterized in that: The main shaft is loosely sleeved on the first driving shaft.

8. The power assembly according to any one of claims 1 to 7, characterized in that: The powertrain also includes a second motor, a second drive shaft and a clutch device; A motor shaft of the second motor is connected to the second drive shaft; The second drive shaft is suitable for connecting to a second wheel; Of the first wheel and the second wheel, one is a front wheel and the other is a rear wheel; The output shaft is connected to the planet carrier through the clutch device; The clutch device comprises an active part and a driven part, wherein the active part is connected to the output shaft, and the driven part is connected to the planet carrier; the clutch device has a switchable engagement state and a disengagement state; When the clutch device is in a coupled state, the active part is coupled with the driven part, so that the torque of the output shaft can be transmitted to the planet carrier; When the clutch device is in a disengaged state, the active part and the driven part are separated to prevent the output shaft torque from being transmitted to the planet carrier.

9. The powertrain according to claim 3, characterized in that: The powertrain also includes a second motor and a second drive shaft, the second motor is electrically connected to the first motor, the motor shaft of the second motor is connected to the second drive shaft, and the second drive shaft is suitable for connecting to a second wheel; one of the first wheel and the second wheel is a front wheel, and the other is a rear wheel.

10. The powertrain according to claim 9, characterized in that: The power drive system has a first direct drive mode and a second direct drive mode; When the power drive system is in the first direct drive mode, the first locking mechanism unlocks the planet carrier, the second locking mechanism locks the main shaft, the selection unit is in the first state, the engine is working, the first motor is not working, and the second motor is not working; When the power drive system is in the second direct drive mode, the first locking mechanism unlocks the planetary carrier, the second locking mechanism locks the main shaft, the selection unit is in the second state, the engine is working, the first motor is not working, the second motor is not working, and the power drive system enters the second direct drive mode.

11. The powertrain according to claim 9, characterized in that: The power drive system has a first power split mode, a power split two-drive mode and a parallel mode; When the power drive system is in the first power split mode, the first locking mechanism unlocks the planet carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the first state or the second state, the engine works to drive the first motor to generate electricity, and the second motor drives; when the power drive system is in the second power split mode, the first locking mechanism unlocks the planet carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the first state or the second state, the engine works to drive the first motor to generate electricity, and the second motor does not work; When the power drive system is in the parallel mode, the first locking mechanism unlocks the planetary carrier, the second locking mechanism locks the main shaft, the selection unit is in the first state or the second state, the engine is working, the first motor is not working, and the second motor is driving.

12. The powertrain according to claim 9, characterized in that: The power drive system has a first pure electric mode, a second pure electric mode and a third pure electric mode; When the power drive system is in the first pure electric mode, the first locking mechanism locks the planet carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the third state, the engine does not work, the first motor is driven, and the second motor is driven; wherein, when the selection unit is in the third state, the first driving wheel is separated from the output shaft, and the second driving wheel is separated from the output shaft; When the power drive system is in the second pure electric mode, the first locking mechanism locks the planet carrier, the second locking mechanism unlocks the main shaft, the selection unit is in a third state, the engine does not work, the first motor drives, and the second motor does not work; When the power drive system is in the third pure electric mode, the first locking mechanism locks the planetary carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the third state, the engine does not work, the first motor does not work, and the second motor is driven.

13. The powertrain according to claim 9, characterized in that: The power drive system has a first energy recovery mode and a second energy recovery mode; When the power drive system is in the first energy recovery mode, the first locking mechanism unlocks the planet carrier, the selection unit is in the third state, the engine does not work, the first motor does not work, and the second motor generates electricity; wherein, when the selection unit is in the third state, the first driving wheel is separated from the output shaft, and the second driving wheel is separated from the output shaft; When the power drive system is in the second energy recovery mode, the first locking mechanism unlocks the planetary carrier, the second locking mechanism unlocks the main shaft, the selection unit is in the third state, the engine does not work, the first motor generates electricity, and the second motor does not work.

14. A vehicle, characterized in that: A power assembly comprising any one of claims 1 to 13.

15. A vehicle control method, characterized in that: Used to control the operation of a vehicle having the powertrain according to claim 8, the vehicle control method comprising controlling the vehicle to operate in any one of a direct drive mode and a power split mode; When the vehicle operates in the direct drive mode, the engine operates, the clutch device is in a coupled state, the first locking mechanism unlocks the planet carrier, the second locking mechanism locks the main shaft, and the first generator does not operate; When the vehicle operates in the power split mode, the engine is operating, the clutch device is in a coupled state, the first locking mechanism unlocks the planetary carrier, the second locking mechanism unlocks the main shaft, and the first motor generates electricity.

16. The vehicle control method according to claim 15, characterized in that: The vehicle control method further includes controlling the vehicle to switch from the power split mode to the direct drive mode; The step of controlling the vehicle to switch from the power split mode to the direct drive mode includes: controlling the second motor to operate so as to drive the second wheel through the second motor; Controlling the clutch device to switch from the engaged state to the disengaged state; controlling the second locking mechanism to lock the main shaft; The clutch device is controlled to switch from the disengaged state to the engaged state.

17. The vehicle control method according to claim 16, characterized in that: Between the step of controlling the clutch device to switch from the engaged state to the disengaged state and the step of controlling the second locking mechanism to lock the main shaft, the method further includes: controlling the main shaft to decelerate to a first target speed; and / or, Between the step of controlling the second locking mechanism to lock the main shaft and the step of controlling the clutch device to switch from the disengaged state to the engaged state, the method further includes: adjusting the rotation speed of the output shaft so that the rotation speed difference between the active part and the driven part satisfies a first predetermined value; and / or, After the step of controlling the clutch device to switch from the disengaged state to the engaged state, the method further includes: controlling the second motor to stop working.

18. The vehicle control method according to claim 15, characterized in that: The vehicle control method further includes controlling the vehicle to switch from the direct drive mode to the power split mode; The step of controlling the vehicle to switch from the direct drive mode to the power split mode includes: controlling the second motor to operate so as to drive the second wheel through the second motor; Controlling the clutch device to switch from an engaged state to a disengaged state; controlling the second locking mechanism to unlock the main shaft; The clutch device is controlled to switch from the disengaged state to the engaged state.

19. The vehicle control method according to claim 18, characterized in that: Between the step of controlling the second locking mechanism to unlock the main shaft and the step of controlling the clutch device to switch from the disengaged state to the engaged state, the method further includes: adjusting the rotation speed of the output shaft so that the rotation speed difference between the active part and the driven part meets a second predetermined value.

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