Single-motor hybrid gearbox, control method and vehicle

Abstract

The invention provides a single-motor hybrid gearbox, a control method and a vehicle, and belongs to the technical field of hybrid gearboxes, in the single-motor hybrid gearbox, an engine shaft is sleeved with a direct drive gear, a first dog-tooth clutch is arranged on the engine shaft, and a jaw tooth of the first dog-tooth clutch is connected with the direct drive gear; the driving gear is hollowly sleeved on the motor shaft, the planetary gear set and the second dog-tooth clutch are arranged on the motor shaft, the first side of the second dog-tooth clutch is connected with the engine shaft, and the second side of the second dog-tooth clutch is connected with the driving gear; the direct-drive driven gear and the driven gear are arranged on the intermediate shaft, the direct-drive driven gear is constantly meshed with the direct-drive gear, the driven gear is constantly meshed with the driving gear, and the intermediate shaft is further in transmission connection with the differential mechanism. According to the single-motor hybrid gearbox provided by the invention, the number of parts can be reduced, and the structure of the hybrid gearbox is simplified.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hybrid transmission, and particularly relates to a single-motor hybrid transmission, a control method and a vehicle. BACKGROUND

[0002] A hybrid electric vehicle improves energy efficiency through the cooperative work of a motor and an engine. A mainstream scheme currently adopts a complex system composed of a double motor and multiple parallel shafts and multiple clutches, which can realize multiple work modes such as pure electricity and direct drive, but has problems such as complex structure, high cost, complex control, and poor smoothness. SUMMARY

[0003] In view of the above problems, the embodiments of the present application provide a single-motor hybrid transmission, a control method and a vehicle to overcome the above problems or at least partially solve the above problems.

[0004] In a first aspect, the embodiments of the present application provide a single-motor hybrid transmission, comprising: an engine shaft, a motor shaft, an intermediate shaft, a differential, a direct drive gear, a drive gear, a planetary gear set, a direct drive driven gear, a driven gear, a first dog clutch and a second dog clutch; the direct drive gear is sleeved on the engine shaft, the first dog clutch is arranged on the engine shaft and located on the side of the direct drive gear close to the engine, the toothed teeth of the first dog clutch are connected with the direct drive gear; the drive gear is sleeved on the motor shaft, the planetary gear set and the second dog clutch are arranged on the motor shaft, and the planetary gear set is located on the side close to the motor, the first side of the second dog clutch is connected with the engine shaft, and the second side of the second dog clutch is connected with the drive gear; the direct drive driven gear and the driven gear are arranged on the intermediate shaft, the direct drive driven gear is always engaged with the direct drive gear, the driven gear is always engaged with the drive gear, and the intermediate shaft is further transmissionally connected with the differential.

[0005] In some embodiments, the planetary gear set comprises a sun gear, a planet carrier and a ring gear, the sun gear is connected with the motor shaft, the planet carrier is connected with the drive gear, and the ring gear is connected with the first side of the second dog clutch.

[0006] In some embodiments, the direct drive gear is sleeved on the engine shaft through a needle roller shaft tooth, and the drive gear is sleeved on the motor shaft through the needle roller shaft tooth.

[0007] In a second aspect, the embodiments of the present application provide a control method of a single-motor hybrid transmission, applied to the single-motor hybrid transmission in the first aspect of the embodiments of the present application, comprising: obtaining a current working condition of a vehicle; based on the current working condition, controlling a first dog clutch in a single-motor hybrid transmission to switch between a first position and a second position, and a second dog clutch to switch between a third position, a fourth position and a fifth position, so as to switch the vehicle between multiple driving modes; wherein, when the first dog clutch is in the first position, the first dog clutch is in an engaged state, and when the first dog clutch is in the second position, the first dog clutch is in a disengaged state; when the second dog clutch is in the third position, a first side of the second dog clutch is in the engaged state, when the second dog clutch is in the fourth position, a second side of the second dog clutch is in the engaged state, and when the second dog clutch is in the fifth position, the second dog clutch is in the disengaged state.

[0008] In some embodiments, based on the current working condition, the first dog clutch in the single-motor hybrid transmission is controlled to switch between the first position and the second position, and the second dog clutch is controlled to switch between the third position, the fourth position and the fifth position, so as to switch the vehicle between multiple driving modes, including: In the case that the first dog clutch is in the first position, the second dog clutch is in the fifth position, and the current working condition represents that the battery power of the vehicle is less than a first preset power, the speed of the motor is controlled to be within a preset speed range, and the vehicle is controlled to switch to a parking power generation or engine starting mode; the parking power generation or engine starting mode is to control the first dog clutch to be in the second position and the second dog clutch to be in the third position.

[0009] In some embodiments, the control method further includes: in the case that the first dog clutch is in the first position, the second dog clutch is in the fifth position, and the current working condition represents that the battery power is greater than or equal to the first preset power, the vehicle is controlled to switch to a rear-drive mode; the rear-drive mode is to control the first dog clutch to be in the second position and the second dog clutch to be in the fifth position.

[0010] In some embodiments, the control method further includes: in the case that the current working condition represents that the driving speed of the vehicle is higher than a first preset speed and the battery power is less than a second preset power, the vehicle is controlled to switch to an engine driving power generation mode; the engine driving power generation mode is to control the first dog clutch to be in the first position and the second dog clutch to be in the third position; wherein, the second preset power is greater than the first preset power.

[0011] In some embodiments, the control method further comprises: in the case that the current working condition represents that the driving speed of the vehicle is higher than a second preset speed, controlling the vehicle to switch to a motor-parallel-engine driving mode, the motor-parallel-engine driving mode being that the first dog clutch is controlled to be located at the first position and the second dog clutch is controlled to be located at the fourth position, and the second preset speed is greater than the first preset speed.

[0012] In some embodiments, the control method further comprises: in the case that the current working condition represents that the vehicle is driving on a bumpy road surface, controlling the vehicle to switch to a rear-wheel driving extended range mode; the rear-wheel driving extended range mode being that the first dog clutch is controlled to be located at the second position and the second dog clutch is controlled to be located at the fourth position.

[0013] In a third aspect, the embodiments of the present application provide a vehicle, which comprises a front axle and a rear axle, the front axle is provided with the single-motor hybrid transmission as described in the first aspect of the embodiments of the present application, and the rear axle is provided with a pure electric drive box.

[0014] The single-motor hybrid transmission provided by the embodiments comprises an engine shaft, a motor shaft, an intermediate shaft, a differential, a direct drive gear, a driving gear, a planetary gear set, a direct drive driven gear, a driven gear, a first dog clutch and a second dog clutch, so as to realize flexible and efficient switching of the power output by the motor between driving and power generation functions through the two dog clutches (the first dog clutch and the second dog clutch) and the parallel shafts (the engine shaft, the motor shaft and the intermediate shaft), reduce the number of parts, simplify the structure of the traditional dual-motor hybrid transmission, set the direct drive gear on the engine shaft, set the first dog clutch on the engine shaft and on the side of the direct drive gear close to the engine, connect the toothed gears of the first dog clutch with the direct drive gear, set the driving gear on the motor shaft, set the planetary gear set and the second dog clutch on the motor shaft, connect the first side of the second dog clutch with the engine shaft, connect the second side of the second dog clutch with the driving gear, set the direct drive driven gear and the driven gear on the intermediate shaft, make the direct drive driven gear always mesh with the direct drive gear and the driven gear always mesh with the driving gear, and make the intermediate shaft further transmissionally connected with the differential, so as to make the switching process of the vehicle between driving modes more rapid and smooth. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0016] Figure 1 is a structural schematic diagram of a single-motor hybrid transmission provided by an embodiment of the present application; Figure 2 is a step flowchart of a control method of a single-motor hybrid transmission provided by an embodiment of the present application; Figure 3 is a schematic diagram of a power transmission path in a parking power generation or engine starting mode provided by an embodiment of the present application; Figure 4 is a schematic diagram of a power transmission path in a rear-wheel drive mode provided by an embodiment of the present application; Figure 5 is a schematic diagram of a power transmission path in an engine driving power generation mode provided by an embodiment of the present application; Figure 6 is a schematic diagram of a power transmission path in a motor and engine parallel driving mode provided by an embodiment of the present application; Figure 7 is a schematic diagram of a power transmission path in a three-power source driving mode provided by an embodiment of the present application; Figure 8 is a schematic diagram of a power transmission path in a rear-wheel drive range extending mode provided by an embodiment of the present application; Figure 9 is a schematic diagram of a power transmission path in an engine direct drive mode provided by an embodiment of the present application; Figure 10 is a schematic diagram of a power transmission path in a motor driving mode provided by an embodiment of the present application; Figure 11 is a step flowchart of switching of a vehicle between various driving modes provided by an embodiment of the present application; Reference signs: 1-engine shaft, 2-motor shaft, 3-intermediate shaft, 4-differential, 5-direct drive gear, 6-driving gear, 7-planetary gear set, 8-direct drive driven gear, 9-driven gear, 10-first dog clutch, 11-second dog clutch, 12-engine, 13-motor, 14-rear axle motor, 15-rear axle differential, 16-left front wheel, 17-right front wheel, 18-left rear wheel, 19-right rear wheel. DETAILED DESCRIPTION

[0017] The exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings so as to be connected with the drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application can be more thoroughly understood, and the scope of the present application can be accurately conveyed to those skilled in the art.

[0018] Figure 1 is a structural schematic diagram of a single-motor hybrid gearbox provided by an embodiment of the present application, from Figure 1 It can be known that the single-motor hybrid gearbox comprises an engine shaft 1, a motor shaft 2, an intermediate shaft 3, a differential 4, a direct-drive gear 5, a drive gear 6, a planetary gear set 7, a direct-drive driven gear 8, a driven gear 9, a first dog clutch 10 and a second dog clutch 11; the direct-drive gear 5 is sleeved on the engine shaft 1, the first dog clutch 10 is arranged on the engine shaft 1 and located on the side of the direct-drive gear 5 close to the engine 12, the toothed engagement of the first dog clutch 10 is connected with the direct-drive gear 5; the drive gear 6 is sleeved on the motor shaft 2, the planetary gear set 7 and the second dog clutch 11 are arranged on the motor shaft 2, the planetary gear set 7 is located on the side close to the motor 14, the first side of the second dog clutch 11 is connected with the engine shaft 1, and the second side of the second dog clutch 11 is connected with the drive gear 6; the direct-drive driven gear 8 and the driven gear 9 are arranged on the intermediate shaft 3, the direct-drive driven gear 8 is always engaged with the direct-drive gear 5, the driven gear 9 is always engaged with the drive gear 6, and the intermediate shaft 3 is further transmissionally connected with the differential 4.

[0019] In the embodiment, the engine shaft 1 is a power carrier of the engine 12 output by the engine 12, the engine shaft 1 is connected with the engine 12 on the vehicle, and the engine shaft 1 can transmit the power of the engine 12 to the single-motor hybrid gearbox.

[0020] The direct-drive gear 5 is sleeved on the engine shaft 1, can constitute a key gear of a direct-drive path of the engine 12, and serves as an interface for the first dog clutch 10 to engage or disconnect the engine shaft 1. The direct-drive path of the engine 12 is: engine 12 → engine 12 input shaft → first dog clutch 10 → direct-drive gear 5 → direct-drive driven gear 8 → intermediate shaft 3 → differential 4 → front wheels of the vehicle.

[0021] The first dog clutch 10 is located on the side of the direct-drive gear 5, can serve as a switch of the power path of the engine 12, when the toothed engagement of the first dog clutch 10 is connected with the direct-drive gear 5, the sleeved direct-drive gear 5 can be rigidly locked on the engine shaft 1, so as to establish the direct-drive path of the engine 12, when the toothed engagement of the first dog clutch 10 is separated from the direct-drive gear 5, the direct-drive path of the engine 12 is cut off.

[0022] The motor shaft 2 is a power carrier of the motor 13 output and planetary gear transmission, the motor shaft 2 is connected with the motor 13 on the vehicle, and the motor shaft 2 can transmit the power output by the motor 13 to the single-motor hybrid gearbox.

[0023] The drive gear 6 is sleeved on the motor shaft 2, can constitute a key gear of a power path of the motor 13, and serves as an interface for the second dog clutch 11 to engage or disconnect the motor shaft 2.

[0024] The planetary gear set 7 is arranged on the motor shaft 2, and can fixedly amplify the torque of the motor 13, or can split and converge the power output by the motor 13 through (sun gear, planet carrier, ring gear).

[0025] The second dog clutch 11 is arranged on the motor shaft 2, the first side of the second dog clutch 11 is connected with the engine shaft 1, and is used for coupling the motor shaft 2 with the engine shaft 1, so as to start the engine 12 or to generate electricity during driving; the second side of the second dog clutch 11 is connected with the drive gear 6, and is used for outputting the power output by the motor 13 to the wheels; and the intermediate neutral position is disconnected with the connection of the axle drive.

[0026] The intermediate shaft 3 can receive the power from the engine 12 path (through the direct drive driven gear 8) and the motor 13 path (through the driven gear 9), and uniformly outputs to the differential 4, the direct drive driven gear 8 and the driven gear 9 are fixed on the intermediate shaft 3, and the direct drive driven gear 8 is always engaged with the direct drive gear 5, and the driven gear 9 is always engaged with the drive gear 6, so that the direct drive driven gear 8 can be used as a power transmission gear pair of the direct drive gear 5, and the engine 12 power transmitted by the direct drive gear 5 is transmitted to the intermediate shaft 3, and the driven gear 9 can be used as a power transmission gear pair of the drive gear 6, and the power output by the drive gear 6 is transmitted to the intermediate shaft 3.

[0027] Because the intermediate shaft 3 is also in transmission connection with the differential 4, the power output by the motor 13 and the engine 12 power on the intermediate shaft 3 will be transmitted to the differential 4, and the differential 4 will distribute the converged final power (the power output by the motor 13 and / or the engine 12 power) to the front wheels of the vehicle.

[0028] In summary, through the single-motor hybrid transmission provided by the embodiment, the driving and power generation functions can be realized by a single motor, specifically through the connection relationship among the engine shaft 1, the motor shaft 2, the intermediate shaft 3, the differential 4, the direct drive gear 5, the drive gear 6, the planetary gear set 7, the direct drive driven gear 8, the driven gear 9, the first dog clutch 10 and the second dog clutch 11, the complex multi-clutch and planetary gear system can be replaced, the number of parts is greatly reduced, the weight, cost and failure rate are reduced, when the first dog clutch 10 is connected with the direct drive gear 5, the power output by the engine 12 can pass through the first dog clutch 10, the direct drive gear 5, the direct drive driven gear 8 and the intermediate shaft 3 in sequence, and then output to the differential 4, and the transmission loss is extremely small. When the power output by the motor 13 passes through the planetary gear set 7 to reduce the speed and increase the torque, and the second dog clutch 11 is connected with the drive gear 6, the power output by the motor 13 can also pass through the second dog clutch 11, the drive gear 6, the driven gear 9 and the intermediate shaft 3 in sequence, and then output to the differential 4.

[0029] Further, when the first dog clutch 10 is separated from the direct drive gear 5 and the second dog clutch 11 is not connected with the engine shaft 1 and the drive gear 6, the power transmission chain where the power of the engine 12 and the power output by the motor 13 are located can be completely decoupled, thereby allowing the torque to be compensated by other driving sources (such as the motor 13 of the rear axle) when switching between different driving modes (such as pure electric drive to direct drive), achieving smooth switching without power interruption, and eliminating the drag loss of the traditional hybrid system when driving in pure electric mode.

[0030] In some embodiments, the planetary gear set 7 includes a sun gear, a planet carrier, and a ring gear, the sun gear is connected with the motor shaft 2, the planet carrier is connected with the drive gear 6, and the ring gear is connected with the first side of the second dog clutch 11.

[0031] In this embodiment, the sun gear can serve as the input end of the planetary gear set 7, receiving the power output by the motor 13 through the motor shaft 2. The planet carrier can serve as the output end of the planetary gear set 7, and the rotational motion is transmitted to the drive gear 6 connected with the planet carrier, so as to output the power after being reduced in speed and increased in torque by the planetary gear set 7 to the intermediate shaft 3. The ring gear can serve as the control end of the planetary gear set 7, and is selectively connected or disconnected with the engine shaft 1 through the second dog clutch 11.

[0032] Through the specific connection structure of the sun gear, the planet carrier, and the ring gear, the constraint condition of the ring gear can be changed by controlling the state of the second dog clutch 11, thereby realizing different power transmission modes. Specifically, when the second dog clutch 11 is disconnected with the engine shaft 1, the planetary gear set 7 functions as a reducer, realizing pure electric driving. When the second dog clutch 11 is engaged with the engine shaft 1, the ring gear is connected with the engine shaft 1, and the rotational speed of the engine 12 can intervene in the motion relationship of the planetary gear set 7, so as to realize the rotational speed coupling of the engine 12 and the motor 13, which is used for efficiently starting the engine, generating power during driving, or power splitting.

[0033] Therefore, when the second dog clutch 11 is rigidly connected with the engine shaft 1 through the embodiment provided, the rotational speed of the engine 12 becomes an actively controllable variable, so that the planetary gear set 7 can manage the rotational speed and torque of the engine 12 and the motor 13 at the same time, thereby supporting the engine 12 starting without additional starting motor 13, efficiently generating power (range extending) during driving, and the rotational speed synchronization and power splitting of the engine 12 and the motor 13, and other advanced hybrid power functions.

[0034] In some embodiments, the direct drive gear 5 is sleeved on the engine shaft 1 through needle roller shaft teeth, and the drive gear 6 is sleeved on the motor shaft 2 through needle roller shaft teeth.

[0035] In the embodiment, the needle roller shaft tooth is used for supporting the rotating part, the direct drive gear 5 is sleeved on the engine shaft 1 through the needle roller shaft tooth, and the direct drive gear 5 can rotate independently relative to the engine shaft 1, when the first dog clutch 10 is not connected with the direct drive gear 5, although the engine shaft 1 can rotate, the direct drive gear 5 can remain stationary (or is reversely driven by the direct drive driven gear 8 which is always engaged with the direct drive gear 5). At this time, the engine 12 power is effectively isolated and cannot be transmitted to the wheels. When the engine 12 is directly driven, the toothed teeth of the first dog clutch 10 are connected with the direct drive gear 5, the sleeved direct drive gear 5 is rigidly locked on the engine shaft 1, and the two become an integral synchronous rotation, thereby establishing a direct drive path of the engine 12.

[0036] The drive gear 6 is sleeved on the motor shaft 2 through the needle roller shaft tooth, and when the first side of the second dog clutch 11 is connected with the motor shaft 2, the sleeved drive gear 6 can be rigidly locked on the motor shaft 2, at this time, the power output by the motor 13 is reduced in speed and increased in torque through the planetary gear set 7, and then output to the intermediate shaft 3 through the locked drive gear 6, realizing pure electric or parallel driving.

[0037] When the second side of the second dog clutch 11 is connected with the drive gear 6, the drive gear 6 is in a free state of idling on the motor shaft 2. At this time, the engine shaft 1 and the motor shaft 2 are rigidly connected through the second dog clutch 11, the engine 12 can drag the motor 13 to generate electricity, or the motor 13 can reversely drag the engine 12 to start.

[0038] When neither the motor shaft 2 nor the drive gear 6 is connected on both sides of the second dog clutch 11, the drive gear 6 is completely free to idle on the motor shaft 2. At this time, the entire front axle drive chain (including the motor 13 and the planetary gear set 7) loses mechanical connection with the wheels, realizing complete power decoupling. When the rear axle motor 14 drives the vehicle to move, the front axle dragging loss can be eliminated.

[0039] Figure 2 It is a step flow chart of a control method of a single-motor hybrid transmission provided by the embodiment, applied to the single-motor hybrid transmission of the first aspect of the embodiment, from Figure 2 It can be known that the step flow includes: Step S201: acquiring a current working condition of a vehicle.

[0040] The current working condition of the vehicle in the embodiment can include the battery level of the vehicle, the driving speed of the vehicle, the driving demand of the vehicle, the running state of the engine 12, the current state and the speed difference of the first dog clutch 10 and the second dog clutch 11, and the like. The battery level can determine whether the vehicle should be mainly powered by electricity or mainly powered by electricity generation. When the battery level is less than the first preset battery level, the engine 12 will be started to charge or generate power. The driving speed of the vehicle is to determine the driving speed interval in which the vehicle is located. The low-speed domain preferentially uses the motor 13 to drive to ensure the response and smoothness; the medium and high-speed domain preferentially uses the engine 12 to drive directly to ensure the fuel economy. The speed is also an important basis for determining whether the clutch engagement synchronization condition is met. The driving demand can directly reflect the power request of the driver. The sudden pedal or large opening degree represents the urgent acceleration or strong power demand, which can correspond to the parallel driving mode of the motor 13 and the engine 12 or the three power source driving mode. The running state of the engine 12 indicates that the engine 12 is currently in the off or start state. The running state of the engine 12 can determine the initial condition and the required control process of the driving mode switching. For example, when switching from the pure electric mode to the engine 12 direct drive mode, if the engine 12 has been turned off, the control process needs to include a start step; if it is running, the speed synchronization and engagement can be directly performed. The current state and the speed difference of the first dog clutch 10 and the second dog clutch 11 can be the current connection position of the first dog clutch 10 and the second dog clutch 11, and the speed difference between the components to be connected, which can be a direct feedback parameter to ensure the smoothness and reliability of gear shifting. The control system needs to monitor the speed difference in real time, and when the speed difference is less than a safety threshold, the first dog clutch 10 or the second dog clutch 11 can be instructed to engage, so as to avoid impact and tooth collision.

[0041] Step S202: Based on the current working condition, the first dog clutch 10 in the single-motor hybrid transmission is switched between the first position and the second position, and the second dog clutch 11 is switched between the third position, the fourth position and the fifth position, so as to switch the vehicle between various driving modes; wherein, When the first dog clutch 10 is located at the first position, the first dog clutch 10 is in the engaged state, and when the first dog clutch 10 is located at the second position, the first dog clutch 10 is in the separated state; when the second dog clutch 11 is located at the third position, the first side of the second dog clutch 11 is in the engaged state, when the second dog clutch 11 is located at the fourth position, the second side of the second dog clutch 11 is in the engaged state, and when the second dog clutch 11 is located at the fifth position, the second dog clutch 11 is in the separated state.

[0042] In the embodiment, the current working condition of the vehicle can be used to determine the current scenario and driving demand of the vehicle, including the starting or initialization scenario, low-speed scenario, medium-high speed scenario, high-speed scenario, etc. After determining the current scenario of the vehicle, the first dog clutch 10 in the single-motor hybrid transmission can be controlled to switch between the first position and the second position, and the second dog clutch 11 can be controlled to switch between the third position, the fourth position and the fifth position, so that the vehicle can switch between different driving modes to adapt to different scenarios or driving demands. Table 1 is a table provided by the embodiment, which shows the positions of the first dog clutch and the second dog clutch corresponding to different driving modes.

[0043] Table 1 - Positions of the first dog clutch and the second dog clutch corresponding to different driving modes

[0044] As shown in Table 1, the second position of the first dog clutch 10 corresponds to the neutral position, and the fifth position of the second dog clutch 11 corresponds to the neutral position. The driving modes include the parking power generation or engine starting mode, the rear-wheel drive range extending mode, the engine 12 direct drive mode, the front axle motor 13 driving mode, the motor 13 and engine 12 parallel driving mode, the engine 12 driving power generation mode and the rear drive mode. The disengaged state of the first dog clutch 10 indicates that the toothed gear of the first dog clutch 10 is connected with the direct drive gear 5, and the engaged state of the first dog clutch 10 indicates that the toothed gear of the first dog clutch 10 is not connected with the direct drive gear 5; the first side of the second dog clutch 11 in the engaged state indicates that the first side of the second dog clutch 11 is connected with the engine shaft 1, the second side of the second dog clutch 11 in the engaged state indicates that the second side of the second dog clutch 11 is connected with the drive gear 6, and the disengaged state of the second dog clutch 11 indicates that the motor shaft 2 is not connected with the engine shaft 1 and the drive gear 6. By controlling the first dog clutch 10 to switch between the first position and the second position, and the second dog clutch 11 to switch between the third position, the fourth position and the fifth position, the seven driving modes in Table 1 can be switched according to different scenarios and driving demands.

[0045] In some embodiments, based on the current operating conditions, the first dog clutch 10 in the single-motor hybrid transmission is controlled to switch between a first position and a second position, and the second dog clutch 11 is controlled to switch between a third position, a fourth position, and a fifth position, so that the vehicle can switch between multiple driving modes. This includes: when the first dog clutch 10 is in the first position, the second dog clutch 11 is in the fifth position, and the current operating condition indicates that the vehicle's battery charge is less than a first preset charge, controlling the speed of the motor 13 to be within a preset speed range, and controlling the vehicle to switch to the parking power generation or engine starter 12 mode; the parking power generation or engine starter 12 mode is to control the first dog clutch 10 to be in the second position and the second dog clutch 11 to be in the third position.

[0046] In this embodiment, when the first dog clutch 10 is in the first position and the second dog clutch 11 is in the fifth position, the vehicle may be in an initialization or parking scenario, indicating that the vehicle is in engine 12 direct drive mode, but engine 12 has not yet been requested to drive the vehicle. The first preset battery level can be the minimum battery level required to drive engine 12 to drive the vehicle. If the vehicle's battery level is less than the first preset battery level, it is determined that the vehicle's power battery needs to be charged. At this time, the speed of motor 13 is first controlled to be within a preset speed range. The preset speed can be 20 rpm. The preset speed can be set according to the actual situation, and this embodiment does not limit it.

[0047] After controlling the speed of motor 13 within a preset range, the vehicle is switched to parking power generation or engine starter 12 mode. At this time, the position of the first dog clutch 10 remains unchanged, cutting off the direct drive path from engine 12 to the wheels; the second dog clutch 11 is switched to the third position, connecting engine shaft 1 to motor shaft 2. In parking power generation or engine starter 12 mode, motor 13 is controlled to operate in power generation mode, converting the mechanical energy transmitted from engine 12 into electrical energy to charge the vehicle's power battery, thus efficiently achieving the parking charging function. If engine 12 is initially off, motor 13 can also be used to reverse-start engine 12.

[0048] Figure 3 This is a schematic diagram of the power transmission path in a parking power generation or engine start mode provided in an embodiment of this application. Figure 3 As can be seen from the above, the power transmission path of engine 12 in the parking power generation or engine start mode includes: engine 12 → engine shaft 1 → second dog tooth clutch 11 → motor shaft 2 → motor 13.

[0049] In some embodiments, the control method further comprises: in the case that the first dog clutch 10 is located at the first position, the second dog clutch 11 is located at the fifth position, and the current working condition represents that the battery power is greater than or equal to the first preset power, controlling the vehicle to switch to the rear drive mode, and the rear drive mode is to control the first dog clutch 10 to be located at the second position and the second dog clutch 11 to be located at the fifth position.

[0050] In the embodiment, in the case that the current power of the vehicle is higher than the first preset power, it is indicated that the power battery of the vehicle does not need to start the engine 12 to generate electricity, at this time the vehicle can enter the scene of pure electric driving, the first dog clutch 10 can be maintained at the second position to disconnect the engine 12 and the direct drive gear 5, and the second dog clutch 11 can be maintained at the fifth position to disconnect the connection between the motor shaft 2 and the drive gear 6, so that the engine 12 and the motor 13 of the front axle of the vehicle are completely decoupled from the wheels in the mechanical layer, at this time the pure electric drive box in the rear axle of the vehicle provides all the driving torque, the vehicle enters the pure electric rear drive mode, and all drag losses and mechanical friction losses of the front axle transmission chain (including gears, bearings and possibly idling motor 13 rotor) are eliminated. The power is directly transmitted from the rear axle motor 14 to the rear wheels through the reducer, the path is short, the efficiency is high, and the pure electric cruising range of the vehicle is significantly prolonged. Figure 4 is a schematic diagram of a power transmission path in the rear drive mode provided by an embodiment of the application, from which it can be seen that the power transmission path in the rear drive mode is: rear axle motor 14→ rear axle reducer→ rear axle differential 15→ left rear wheel 18+right rear wheel 19. Figure 4 In the rear drive mode, the first dog clutch 10 and the second dog clutch 11 of the front axle are respectively located at the second position and the fifth position, so that the engine 12 and the motor 13 of the front axle are decoupled from the wheels. The rear drive mode can completely eliminate all drag losses of the front axle transmission system, and is driven by the rear axle motor 14 only, thereby realizing the significant prolongation of the pure electric cruising range when the power is sufficient.

[0051] In some embodiments, the control method further comprises: in the case that the current working condition represents that the driving speed of the vehicle is higher than the first preset speed and the battery power is less than the second preset power, controlling the vehicle to switch to the engine 12 driving power generation mode; the engine 12 driving power generation mode is to control the first dog clutch 10 to be located at the first position and the second dog clutch 11 to be located at the third position; and the second preset power is greater than the first preset power.

[0052] In the present embodiment, when the vehicle speed is higher than the first preset speed and the battery power is less than the second preset power, the second preset power is greater than the first preset power, indicating that the current driving demand of the vehicle is to maintain the current speed, but to avoid the continuous decline of the battery power. Therefore, in order not to reduce the vehicle speed, the vehicle can be switched to the engine 12 driving power generation mode, and the engine 12 is used to charge the power battery, so as to avoid the battery power from declining to a dangerous level. The engine 12 driving power generation mode is to control the first dog clutch 10 to be located at the first position, and at this time, the direct drive path of the engine 12 is unobstructed. The main responsibility of the engine 12 is still to drive the vehicle to move forward and ensure uninterrupted driving power. The second dog clutch 11 is located at the third position, indicating that the engine shaft 1 and the motor shaft 2 are rigidly coupled. At this time, part of the torque of the engine 12 is allocated to the motor 13, and at this time, the output power of the engine 12 is split into two parts, one part is driven through the direct drive path of the first dog clutch 10, and the other part is transmitted to the motor shaft 2 through the second dog clutch 11 to drive the motor 13 to operate as a generator 13, and mechanical energy is converted into electrical energy to charge the power battery.

[0053] Figure 5 is a schematic diagram of a power transmission path in an engine driving power generation mode provided by an embodiment of the present application, from Figure 5 It can be known from the figure that the engine 12 driving power generation mode includes a power transmission path one and a power transmission path two. The power transmission path one is: the engine 12→ the engine shaft 1→ the first dog clutch 10 (located at the first position)→ the direct drive gear 5→ the direct drive driven gear 8→ the intermediate shaft 3→ the differential 4→ the wheel. This path uses part of the power of the engine 12 to directly drive the vehicle and maintain driving.

[0054] The power transmission path two is: the engine 12→ the engine shaft 1→ the second dog clutch 11 (located at the third position)→ the motor shaft 2→ the rotor of the front axle motor 13. This path uses another part of the power of the engine 12 to drive the front axle motor 13 to operate as a generator 13, so as to convert mechanical energy into electrical energy to charge the power battery. In the engine 12 driving power generation mode, the engine 12 simultaneously performs the dual tasks of driving the vehicle and driving the generator, and realizes efficient energy supplement of the vehicle during driving. The power distribution ratio of the power transmission path one and the power transmission path two can be dynamically and coordinately controlled by the vehicle controller according to the vehicle demand, the battery state and the efficient working interval of the engine 12.

[0055] In some embodiments, the control method further comprises: in the case that the current driving speed of the vehicle is higher than a second preset speed, the vehicle is controlled to switch to the motor 13 and engine 12 parallel driving mode, the motor 13 and engine 12 parallel driving mode is that the first dog clutch 10 is controlled to be located at the first position, the second dog clutch 11 is controlled to be located at the fourth position, and the second preset speed is greater than the first preset speed.

[0056] In the embodiment, in the case that the driving speed of the vehicle is higher than the second preset speed, the second preset speed is greater than the first preset speed, and the vehicle corresponds to the scenarios of high-speed overtaking, continuous climbing or the driver giving an urgent acceleration instruction, etc., which require extremely high instantaneous power and continuous torque, at this time, the power provided by the motor 13 or the engine 12 alone is insufficient to meet the driving demand, and the vehicle needs to be switched to the motor 13 and engine 12 parallel driving mode, and the power is provided by the motor 13 and the engine 12 at the same time, at this time, the first dog clutch 10 is controlled to be located at the first position, the second dog clutch 11 is controlled to be located at the fourth position, and the power output by the engine 12 and the motor 13 can be synchronously transmitted to the intermediate shaft 3 through two independent and parallel power transmission paths, the direct superposition of the torque is realized, and the torque is distributed to the front wheels through the differential 4 to drive the vehicle.

[0057] Figure 6 is a schematic diagram of a power transmission path in the motor and engine parallel driving mode provided by the embodiment of the application, from which Figure 6 It can be known from that the motor 13 and engine 12 parallel driving mode comprises an engine 12 power transmission path and a motor 13 power transmission path, the engine 12 power transmission path: engine 12 → engine shaft 1 → first dog clutch 10 (located at the first position) → direct drive gear 5 → direct drive driven gear 8 → intermediate shaft 3. The motor 13 power transmission path: front axle motor 13 → motor shaft 2 → planetary gear set 7 → drive gear 6 → second dog clutch 11 (located at the fourth position) → driven gear 9 → intermediate shaft 3. After the power output by the engine 12 and the power output by the motor 13 are combined at the intermediate shaft 3, the power is distributed to the front wheels through the differential 4. The parallel configuration realizes the direct superposition of the engine 12 torque and the motor 13 torque, can instantaneously provide peak driving force far exceeding a single power source, and perfectly copes with the extreme power demand scenarios such as high-speed overtaking and steep slope climbing, and the engine 12 and the motor 13 can work in respective high-efficiency intervals.

[0058] In addition, if the power still cannot meet the driving demand, the rear axle electric drive box can be seamlessly cooperated. When the extreme power demand is detected, the rear axle motor 14 can be instructed to output the maximum torque at the same time on the basis of the motor 13 and engine 12 parallel driving mode, so that the engine 12, the front axle motor 13 and the rear axle motor 14 form three power sources to drive four wheels, and the power of the four wheels of the vehicle is further improved.

[0059] Figure 7 is a schematic diagram of a power transmission path in a three power source driving mode provided by an embodiment of the present application, from Figure 7 It can be seen that the three power source driving mode includes an engine 12 power transmission path, a motor 13 power transmission path, and a rear axle motor 14 power transmission path. The engine 12 power transmission path is: engine 12 → engine shaft 1 → first dog clutch 10 (located at the first position) → direct drive gear 5 → direct drive driven gear 8 → intermediate shaft 3 → front axle differential 4 → left front wheel 16 + right front wheel 17.

[0060] The motor 13 power transmission path is: front axle motor 13 → motor shaft 2 → planetary gear set 7 → drive gear 6 → second dog clutch 11 (located at the fourth position) → driven gear 9 → intermediate shaft 3 → front axle differential 4 → left front wheel 16 + right front wheel 17.

[0061] The rear axle motor 14 power transmission path is: rear axle motor 14 → rear axle reducer → rear axle differential 15 → left rear wheel 18 + right rear wheel 19. Thus, the output torques of the engine 12, the front axle motor 13, and the rear axle motor 14 can be coordinated and vectorially distributed in real time by the vehicle controller. The dual power of the front axle (the power output by the engine 12 and the power output by the motor 13) drives the front wheels after being mechanically coupled at the intermediate shaft 3, and the rear axle motor 14 independently drives the rear wheels, thereby forming four-wheel drive. This configuration can maximize the power output of the hybrid power system, providing instantaneous acceleration, extreme climbing, and high-speed reacceleration capabilities, and meeting users' pursuit of higher power performance.

[0062] In some embodiments, the control method further includes: in the case where the current working condition represents that the vehicle is driving on a bumpy road surface, controlling the vehicle to switch to a rear-wheel drive range-extending mode; and the rear-wheel drive range-extending mode is to control the first dog clutch 10 to be located at the second position and the second dog clutch 11 to be located at the fourth position.

[0063] In the present embodiment, the current working condition represents that the vehicle is running on a bumpy road, which means that the vehicle has a large variation in adhesion to the road and an unstable body posture. In this scenario, the traditional engine 12 direct drive or front axle drive may exacerbate wheel slip and body pitch due to power interruption or torque mutation. In order to ensure the smooth running of the vehicle, the main driving task can be handed over to the rear axle motor 14, which takes advantage of the better traction characteristics of rear-wheel drive vehicles when accelerating, reduces the burden of the front wheels between driving and steering, and improves the controllability in the direction on the rough road. Therefore, the vehicle is switched to the rear-wheel drive range extending mode, and the rear-wheel drive range extending mode is that the first dog clutch 10 is controlled to be in the second position, completely cutting off the rigid mechanical connection between the engine 12 and the wheels, which can effectively isolate the direct transmission of the vibration and torque fluctuation of the engine 12 to the vehicle body, and improve the ride comfort on the bumpy road. The second dog clutch 11 is in the fourth position and is connected with the engine shaft 1, so that the engine 12 runs stably in the high-efficiency interval, the front axle motor 13 generates electricity, and provides continuous and stable electric energy for the driving rear wheels and the electric equipment of the whole vehicle, realizes running while charging, and avoids the burden on the battery caused by frequent charging and discharging due to bumps.

[0064] Figure 8 is a schematic diagram of a power transmission path in the rear-wheel drive range extending mode provided by an embodiment of the present application, from Figure 8 It can be seen that the rear-wheel drive range extending mode includes an engine 12 power transmission path and a rear axle motor 14 power transmission path.

[0065] The engine 12 power transmission path is: engine 12→engine shaft 1→second dog clutch 11(in the third position)→motor shaft 2→motor 13. In this path, the engine 12 drives the motor 13 to operate as a generator 13, converts mechanical energy into electrical energy, and charges the power battery of the rear axle. The rear axle motor 14 power transmission path is: power battery→rear axle motor 14→rear axle reducer→rear axle differential 15→left rear wheel 18+right rear wheel 19. In this path, the rear axle motor 14 consumes electrical energy to drive the vehicle forward, and is the only power source for the vehicle to run. In the rear-wheel drive range extending mode, the mechanical connection between the engine 12 and the wheels is completely cut off, the vibration and torque fluctuation of the engine 12 are isolated, and the ride comfort is improved; at the same time, the engine 12 operates in the high-efficiency power generation interval, continuously supplements the electrical energy of the battery, thereby supporting the continuous driving of the rear axle motor 14, and realizes the intelligent power distribution of considering comfort, energy safety and endurance capability in complex road conditions such as bumps and wetness.

[0066] In addition, Figure 9 is a schematic diagram of a power transmission path in the engine direct drive mode provided by an embodiment of the present application, from Figure 9It can be seen that the transmission path of the engine 12 direct drive mode is: engine 12 → engine shaft 1 → first dog clutch 10 (in the first position) → direct drive gear 5 → direct drive driven gear 8 → intermediate shaft 3 → differential 4 → left front wheel 16 + right front wheel 17. In this mode, the second dog clutch 11 is in the fifth position of neutral, and the motor 13 and the planetary gear set 7 do not participate in driving. This path realizes that the engine 12 power directly drives the front wheels with the shortest mechanical link, and the transmission efficiency is the highest, which is the optimal economy selection under the medium and high vehicle speed cruising condition.

[0067] Figure 10 It is a power transmission path schematic diagram of a motor driving mode provided by the embodiment of the application, from Figure 10 It can be seen that the power transmission path of the motor 13 driving mode is: front axle motor 13 → motor shaft 2 → planetary gear set 7 (sun wheel input, planet carrier or ring gear output) → drive gear 6 → second dog clutch 11 (in the fourth position) → driven gear 9 → intermediate shaft 3 → differential 4 → left front wheel 16 + right front wheel 17. In this mode, the first dog clutch 10 is in the second position of separation, and the engine 12 does not participate in driving. This path utilizes the planetary gear set 7 to reduce speed and increase torque, fully utilizes the advantages of the motor 13 of high response and high efficiency, and is suitable for starting, low-speed driving and medium and low load conditions.

[0068] Exemplarily, Figure 11 It is a step flowchart of a vehicle switching between multiple driving modes, provided by the embodiment of the application, in combination with Figures 1-11 The switching of multiple driving modes involved in the single-motor hybrid transmission from the starting of the vehicle to the stable running process provided by the embodiment is described in detail.

[0069] The steps of switching the vehicle between multiple driving modes include: Step S111: The vehicle is in a parking or initialization state.

[0070] Step S112: The first dog clutch is in the second position, and the second dog clutch is in the fifth position.

[0071] Step S113: Obtain the battery power of the current vehicle.

[0072] Step S114: If the battery power is less than the first preset power, go to step 115, and if the battery power is greater than or equal to the first preset power, go to step 117.

[0073] Step S115: Control the speed of the motor within a preset speed.

[0074] Step S116: Control the second dog clutch to be in the third position, and switch the vehicle to the parking power generation or engine starting mode.

[0075] Step S117: maintaining the first dog clutch in the second position and the second dog clutch in the fifth position, and the vehicle enters the rear-wheel drive mode.

[0076] Step S118: the running speed of the vehicle is higher than the first preset speed, and the vehicle is switched to the engine driving power generation mode. At this time, the engine torque increases, and the vehicle enters the direct drive gear, and the driving torque of the rear axle motor is zero.

[0077] In summary, the application is a control method of a single-motor hybrid transmission, which can drive the vehicle in the direct drive gear to improve transmission efficiency when the vehicle starts in the pure electric mode and reaches medium and high speeds. Before the engine is directly driven, the engine is started. If the engine is in the starting state and drives the motor to generate electricity, the second dog clutch moves from the third position to the fifth position. If the engine is in the off state, the second dog clutch moves from the fifth position to the third position. The engine and the motor are coupled. The motor starts the engine. After the engine is started, the engine speed is adjusted, the speed difference of the first dog clutch is controlled, the first dog clutch sleeve is engaged with the direct drive gear, and the engine directly drives the vehicle. The second dog clutch returns to the neutral position from the third position. The torque of the rear axle driving motor decreases to 0, the engine torque increases, and the vehicle is driven. During the gear shifting process of the engine direct drive, the vehicle is always driven by the rear axle electric drive assembly, and the vehicle power is uninterrupted.

[0078] In the high-speed stage, the rear axle electric drive assembly participates in driving the vehicle to improve the acceleration performance. If more driving force is needed, the front axle hybrid transmission motor can drive the vehicle. The second dog clutch moves from the fifth position to the fourth position, and the front axle hybrid transmission motor drives the vehicle. At this time, the vehicle power is the strongest, and the engine and all the motors participate in driving the vehicle.

[0079] In the low-speed or starting stage, during the rear-wheel drive electric drive starting process, the front axle hybrid transmission motor can drive the wheels to provide power. The second dog clutch moves to the right from the fifth position to realize motor-driven wheels. If the vehicle battery power is insufficient, the front axle motor cannot drive the wheels. The front axle motor needs to provide the function of generating electricity.

[0080] In the medium and high speed stage, the engine directly drives the wheels, and if the battery power is insufficient, the front axle driving transmission can provide the function of driving the vehicle and generating electricity. The second dog clutch moves to the left from the fifth position to realize the function of motor power generation.

[0081] The application also provides a vehicle, which comprises a front axle and a rear axle, the front axle is provided with the single-motor hybrid transmission according to the first aspect of the application, and the rear axle is provided with a pure electric drive box.

[0082] In this embodiment, the vehicle features a hybrid configuration with a hybrid transmission on the front axle and a pure electric drive unit on the rear axle. The hybrid transmission's single motor generates electricity and drives the vehicle, while the engine coupled with the motor generates electricity to achieve range extension. The engine and motor can drive the vehicle independently or simultaneously. Different driving modes are achieved based on the engagement of the dog-tooth clutch. These driving modes cover all driving modes for new energy vehicles. This configuration is suitable for four-wheel drive, with the front axle using this hybrid transmission and the rear axle using a pure electric drive unit. Optimized driving mode selection allows the vehicle to operate in an ideal state, meeting diverse driving needs and balancing power and economy.

[0083] Therefore, the vehicle provided in this embodiment combines the aforementioned single-motor hybrid transmission with the rear axle pure electric drive box to construct a high-performance hybrid four-wheel drive configuration. This breaks away from the complex mindset of traditional four-wheel drive hybrid systems. By combining the simplified single-motor hybrid module of the front axle with the electric drive module of the rear axle, optimal decoupling and efficient synergy between hardware and function are achieved.

[0084] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0085] Embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods and apparatus according to embodiments of the present invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and the connections between blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations and block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0086] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0087] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0088] The present invention provides a detailed description of a single-motor hybrid transmission, control method, and vehicle. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A single-motor hybrid transmission, characterized in that, include: Engine shaft, motor shaft, intermediate shaft, differential, direct drive gear, drive gear, planetary gear set, direct drive driven gear, driven gear, first dog clutch and second dog clutch; The direct drive gear is loosely fitted on the engine shaft, and the first dog clutch is disposed on the engine shaft and located on the side of the direct drive gear closer to the engine. The teeth of the first dog clutch are connected to the direct drive gear. The drive gear is loosely fitted on the motor shaft, the planetary gear set and the second dog clutch are disposed on the motor shaft, and the planetary gear set is located on the side closer to the motor. The first side of the second dog clutch is connected to the engine shaft, and the second side of the second dog clutch is connected to the drive gear. The direct drive driven gear and the driven gear are mounted on the intermediate shaft. The direct drive driven gear is constantly meshed with the direct drive gear, and the driven gear is constantly meshed with the drive gear. The intermediate shaft is also connected to the differential for transmission.

2. The single-motor hybrid transmission according to claim 1, characterized in that, The planetary gear set includes a sun gear, a planet carrier, and a ring gear. The sun gear is connected to the motor shaft, the planet carrier is connected to the drive gear, and the ring gear is connected to the first side of the second dog clutch.

3. The single-motor hybrid transmission according to claim 1 or 2, characterized in that, The direct drive gear is loosely fitted on the engine shaft via a needle roller shaft, and the drive gear is loosely fitted on the motor shaft via the needle roller shaft.

4. A control method for a single-motor hybrid transmission, characterized in that, The single-motor hybrid transmission applied to any one of claims 1-3 comprises: Obtain the current operating status of the vehicle; Based on the current operating conditions, the first dog clutch in the single-motor hybrid transmission is switched between the first and second positions, and the second dog clutch is switched between the third, fourth and fifth positions, so that the vehicle can switch between multiple driving modes. Wherein, when the first dog clutch is in the first position, the first dog clutch is in an engaged state; when the first dog clutch is in the second position, the first dog clutch is in a disengaged state; when the second dog clutch is in the third position, the first side of the second dog clutch is in an engaged state; when the second dog clutch is in the fourth position, the second side of the second dog clutch is in an engaged state; and when the second dog clutch is in the fifth position, the second dog clutch is in a disengaged state.

5. The control method according to claim 4, characterized in that, Based on the current operating conditions, the first dog clutch in the single-motor hybrid transmission is controlled to switch between a first position and a second position, and the second dog clutch is controlled to switch between a third position, a fourth position, and a fifth position, so that the vehicle can switch between multiple driving modes, including: When the first dog clutch is in the first position, the second dog clutch is in the fifth position, and the current operating condition indicates that the vehicle's battery charge is less than a first preset charge, the motor speed is controlled within a preset speed range, and the vehicle is controlled to switch to a parking power generation or engine start mode; the parking power generation or engine start mode is to control the first dog clutch to be in the second position and the second dog clutch to be in the third position.

6. The control method according to claim 5, characterized in that, Also includes: When the first dog clutch is in the first position, the second dog clutch is in the fifth position, and the current operating condition indicates that the battery charge is greater than or equal to the first preset charge, the vehicle is controlled to switch to rear-wheel drive mode. In rear-wheel drive mode, the first dog clutch is controlled to be in the second position, and the second dog clutch is in the fifth position.

7. The control method according to claim 5, characterized in that, Also includes: When the vehicle's speed is higher than a first preset speed and the battery charge is lower than a second preset charge under the current operating conditions, the vehicle is controlled to switch to engine-driven power generation mode. The engine-driven power generation mode is characterized by controlling the first dog clutch to be in the first position and the second dog clutch to be in the third position. The second preset charge is greater than the first preset charge.

8. The control method according to claim 7, characterized in that, Also includes: When the vehicle's current speed is higher than the second preset speed, the vehicle is switched to a parallel drive mode of the motor and engine. In this parallel drive mode, the first dog clutch is positioned at the first position, the second dog clutch is positioned at the fourth position, and the second preset speed is greater than the first preset speed.

9. The control method according to claim 7, characterized in that, Also includes: When the vehicle is traveling on a bumpy road under the current operating condition, control the vehicle to switch to rear-wheel drive range extender mode. The rear-wheel drive range extender mode controls the first dog clutch to be in the second position and the second dog clutch to be in the fourth position.

10. A vehicle, characterized in that, The vehicle includes a front axle and a rear axle, the front axle is provided with a single-motor hybrid transmission as described in any one of claims 1-3, and the rear axle is provided with a pure electric drive box.

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