Driving system of vehicle and control method thereof

Abstract

The invention provides a driving system of a vehicle, and relates to the field of hybrid power vehicles, the driving system comprises a first driving motor connected with a first wheel through a first transmission system; the driving assembly is connected with the second wheel through a second transmission system, and the first wheel and the second wheel are located on the same driving axle; the driving assembly comprises a power generation rotor which is used for being connected with an engine and can be driven by the engine to rotate; the driving rotor is connected with the second wheel through a second transmission system; and the stator is used for driving the driving rotor to rotate and / or generating electric energy when the power generation rotor rotates. The invention further provides a control method applied to the driving system, and the driving system is compact in structure and capable of reducing the occupied volume of a cabin of the vehicle.

Description

Technical Field

[0001] The present invention relates to the field of hybrid vehicles, and in particular to a vehicle driving system and a control method thereof. Background Art

[0002] A hybrid vehicle is a vehicle with an engine and a motor, wherein the engine is only used to generate electricity through a generator, and the vehicle driven by a drive motor is an extended-range vehicle. The relevant extended-range vehicle needs to be equipped with a power generation system and a drive system, which takes up a large space in the vehicle cabin. Summary of the invention

[0003] The present invention provides a vehicle driving system and a control method thereof, which are used to solve the technical problem of how to make the structure of the driving system more compact and reduce the space of the vehicle cabin that the driving system needs to occupy.

[0004] An embodiment of the present invention provides a vehicle drive system, which includes: a first drive motor, connected to a first wheel through a first transmission system; a drive assembly, connected to a second wheel through a second transmission system, and the first wheel and the second wheel are on the same drive axle; wherein the drive assembly includes: a generator rotor, connected to an engine and capable of rotating under the drive of the engine; a drive rotor, connected to the second wheel through the second transmission system; and a stator, used to drive the drive rotor to rotate, and / or generate electrical energy when the generator rotor rotates.

[0005] Furthermore, in the axial direction of the stator, the power generation rotor and the driving rotor are spaced apart from each other, and the power generation rotor and the driving rotor are both located outside the stator or both located inside the stator.

[0006] Furthermore, in the radial direction of the stator, the stator is located between the driving rotor and the generating rotor.

[0007] Furthermore, in the radial direction of the stator, the driving rotor is located outside the stator, and the generating rotor is located inside the stator.

[0008] Furthermore, the first transmission system is capable of being connected to the second wheel, and the first transmission system has a switching structure, and the switching structure is used to switch the first drive motor and the second wheel between a connected state and a disconnected state. In the connected state, the first drive motor is capable of transmitting torque to the second wheel, and in the disconnected state, the power transmission between the first drive motor and the second wheel is interrupted.

[0009] Furthermore, the first transmission system also includes: a first half-shaft, connecting the first drive motor and the first wheel; a second half-shaft, connecting the first drive motor and the second wheel; wherein the switching structure includes a clutch device, the clutch device is located on the second half-shaft, and is used to switch the first drive motor and the second wheel between a connected state and a disconnected state.

[0010] Furthermore, the first transmission system also includes: a first transmission shaft, connecting the first drive motor and the first wheel, and connecting the first drive motor and the second wheel; a second transmission shaft, connecting the first drive motor and the first wheel, and the second transmission shaft is sleeved on the outside of the first transmission shaft; wherein the switching structure includes a gear assembly, and the gear assembly can connect the first drive motor and the first transmission shaft, or connect the first drive motor and the second transmission shaft.

[0011] Furthermore, the gear assembly includes: a first gear fixedly connected to the first transmission shaft; a second gear fixedly connected to the second transmission shaft; a third gear connected to the first drive motor, and the third gear can move between a first position and a second position, in the first position, the third gear is meshed with the first gear, and in the second position, the third gear is meshed with the second gear.

[0012] Furthermore, the gear assembly includes: a sun gear fixedly connected to the second transmission shaft; a planetary gear meshing with the outside of the sun gear and fixedly connected to the first transmission shaft through a planetary carrier; an outer ring gear meshing with the inside of the planetary gear and connected to the first drive motor; and a brake capable of locking the rotation of the sun gear or locking the rotation of the planetary gear around the center of the sun gear.

[0013] An embodiment of the present invention further provides a control method for a drive system, which is applied to the drive system described in the above embodiment, and the first transmission system has a switching structure; the control method includes: when the remaining power of the vehicle is lower than a preset power threshold, controlling the drive component to be in a power generation state, and when the remaining power of the vehicle is not lower than the preset power threshold, controlling the drive component to be in a driving state; when the drive component is in the driving state, controlling the switching structure to make the first drive motor and the second wheel in a separated state, and controlling the first drive motor to drive the first wheel to rotate, and when the drive component is in the power generation state, controlling the switching structure to make the first drive motor and the second wheel in a connected state, and controlling the first drive motor to drive the first wheel and the second wheel to rotate; wherein, controlling the drive component to be in the power generation state includes: driving the power generation rotor to rotate, and locking the drive rotor; wherein, controlling the drive component to be in the driving state includes: controlling the stator to drive the drive rotor to rotate, and locking the power generation rotor.

[0014] Further, the first transmission system includes a first half-shaft and a second half-shaft, the switching structure includes a clutch device, and the clutch device is located on the second half-shaft; controlling the switching structure so that the first drive motor and the second wheel are in a separated state includes: controlling the clutch device to be in a separated state so that the first drive motor and the second wheel are in a separated state; controlling the switching structure so that the first drive motor and the second wheel are in a connected state includes: controlling the clutch device to be in a coupled state so that the first drive motor and the second wheel are in a connected state.

[0015] Further, the first transmission system includes a first transmission shaft and a second transmission shaft, and the switching structure includes a gear assembly; controlling the switching structure so that the first drive motor and the second wheel are in a separated state includes: controlling the gear assembly so that the first drive motor and the second transmission shaft are in a connected state; controlling the switching structure so that the first drive motor and the second wheel are in a connected state includes: controlling the gear assembly so that the first drive motor and the first transmission shaft are in a connected state.

[0016] Further, the gear assembly includes: a first gear, a second gear and a third gear; controlling the gear assembly so that the first drive motor and the second transmission shaft are in a connected state includes: controlling the third gear to be located in the second position so that the third gear is meshed with the second gear; controlling the gear assembly so that the first drive motor and the first transmission shaft are in a connected state includes: controlling the third gear to be located in the first position so that the third gear is meshed with the first gear.

[0017] Furthermore, the gear assembly includes: a sun gear, a planetary gear, an outer ring gear and a brake; controlling the gear assembly so that the first drive motor and the second transmission shaft are in a connected state includes: controlling the brake to lock the rotation of the planetary gear around the center of the sun gear, so that the outer ring gear drives the sun gear to rotate; controlling the gear assembly so that the first drive motor and the first transmission shaft are in a connected state includes: controlling the controller to lock the rotation of the sun gear, so that the outer ring gear drives the planetary gear to rotate around the center of the sun gear.

[0018] An embodiment of the present invention further provides a control method for a drive system, which is applied to the drive system described in the above embodiment, wherein the drive system further includes: a second drive motor, wherein the second drive motor is connected to a third wheel and a fourth wheel of the vehicle through a third transmission system, wherein the third wheel and the fourth wheel are located on the same drive axle, and the drive axle where the third wheel and the fourth wheel are located is different from the drive axle where the first wheel and the second wheel are located; the control method includes: when the remaining power of the vehicle is lower than a preset power threshold, controlling the drive component to be in a power generation state, and when the remaining power of the vehicle is not lower than the preset power threshold, controlling the drive component to be in a driving state; when the drive component is in the driving state, controlling the first drive motor to drive the first wheel to rotate, and when the drive component is in the power generation state, controlling the first drive motor to stop and increasing the torque output by the second drive motor; wherein, controlling the drive component to be in the power generation state includes: driving the power generation rotor to rotate and locking the drive rotor; and controlling the drive component to be in the driving state includes: controlling the stator to drive the drive rotor to rotate and locking the power generation rotor.

[0019] An embodiment of the present invention provides a vehicle drive system, which includes a first drive motor connected to a first wheel through a first transmission system, and a drive assembly connected to a second wheel through a second transmission system, and the drive assembly can also generate electrical energy. In the width direction of the vehicle, the first wheel and the second wheel are located on both sides of the mass center of the vehicle. The drive assembly can simultaneously realize the driving function and the power generation function, thereby integrating the power generation system of the vehicle with part of the drive system, so that the structure of the drive system is more compact. Among them, the drive assembly includes an engine, a power generation rotor connected to the engine, a driving rotor connected to the second wheel through a second transmission system, and a rotor for driving the driving rotor and capable of generating electrical energy when the power generation rotor rotates, that is, the power generation rotor and the driving rotor of the drive assembly share the same stator, so that the structure of the drive system is more compact, and the space occupied by the drive system in the engine compartment of the vehicle is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a vehicle drive system provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of a driving assembly in a driving system of a vehicle provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of another vehicle drive system provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of another vehicle drive system provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the structure of another vehicle drive system provided by an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the structure of another vehicle drive system provided by an embodiment of the present invention;

[0026] Figure 7 A schematic flow chart of a method for controlling a vehicle driving system provided by an embodiment of the present invention;

[0027] Figure 8 A schematic flow chart of a method for controlling a vehicle drive system provided in an embodiment of the present invention.

[0028] Description of Reference Numerals

[0029] 1. Drive system; 11. First wheel; 12. Second wheel; 100. First drive motor; 200. Drive assembly; 21. Engine; 220. Generator rotor; 230. Drive rotor; 240. Stator; 300. First transmission system; 310. Switching structure; 321. First semi-axle; 331. Second semi-axle; 3311. First sub-axle; 3312. Second sub-axle; 310A. First type of switching structure; 311A. First part ; 312A, second part; 322, first transmission shaft; 332, second transmission shaft; 300B, second type of switching structure; 310B, first gear; 320B, second gear; 330B, third gear; 300C, third type of switching structure; 310C, sun gear; 320C, planetary gear; 330C, outer ring gear; 340C, planetary carrier; 350C, brake; 400, second transmission system; 500, differential. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of 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.

[0031] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of the specific technical features in the present invention will not be described separately.

[0032] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the corresponding schematic diagrams, which may or may not be the left and right directions in normal use.

[0033] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. The term "connected" includes both direct and indirect connections unless otherwise specified.

[0034] In the following specific embodiments, the vehicle drive system can be any type of extended-range vehicle drive system. For example, the drive system can be a car drive system or a bus drive system. At the same time, the vehicle drive system can be applied to any drive axle of the vehicle. For example, the drive system can be a front axle of the vehicle or a rear axle of the vehicle. For ease of description, the structure of the drive system is described below by taking the drive system used for the front axle of a car as an example.

[0035] In some embodiments, Figure 1 As shown, the drive system 1 includes: a first drive motor 100 and a drive assembly 200. The first drive motor 100 is connected to the first wheel 11 through the first transmission system 300. It can be understood that the first drive motor 100 can transmit power to the first wheel 11 through the first transmission system 300, thereby driving the first wheel 11 to rotate. The drive assembly 200 is connected to the second wheel through the second transmission system 400 and can generate electrical energy. It can be understood that the drive assembly 200 can not only transmit power to the second wheel 12 through the second transmission system 400, thereby driving the second wheel 12 to rotate, but also generate electrical energy. In the state where the drive assembly 200 drives the second wheel 12 to rotate, the first drive motor 100 and the drive assembly 200 respectively drive the first wheel 11 and the second wheel to rotate through the first transmission system and the second drive system, thereby realizing distributed drive of the first wheel 11 and the second wheel 12. The speed and torque of the first wheel 11 and the second wheel 12 can be independently controlled. At the same time, the first wheel 11 and the second wheel 12 are on the same drive axle. It can be understood that in the width direction of the vehicle, the first wheel 11 and the second wheel 12 are located on both sides of the mass center of the vehicle, that is, the first wheel 11 and the second wheel 12 are the left wheel and the right wheel of the vehicle, respectively, and the differential steering of the vehicle is realized by making the speed difference between the first wheel 11 and the second wheel 12.

[0036] The structure of the driving assembly 200 is described below. Figure 2As shown, the drive assembly 200 includes: a power generation rotor 220, a driving rotor 230 and a stator 240. The power generation rotor 220 is used to connect with the engine 21, and can rotate under the drive of the engine 21 to form an induced electromotive force in the stator 240, that is, the drive assembly 200 can generate electric energy as a generator through the drive of the engine 21; the driving rotor 230 passes through the second transmission system 400, and the driving rotor 230 can rotate under the drive of the magnetic field generated by the alternating current in the stator 240, so that the driving rotor 230 can generate electric energy through the magnetic field generated by the alternating current in the stator 240. Figure 1 The second transmission system 400 drives the second wheel 12 to rotate. It can be understood that the drive assembly 200 can realize the driving function and the power generation function at the same time, so that the power generation part of the hybrid vehicle can be integrated with the drive system, thereby reducing the space occupied by the drive system of the hybrid vehicle in the cabin. At the same time, the power generation rotor 220 and the drive rotor 230 share a stator 240, so that while the drive assembly 200 can realize the power generation function and the driving function at the same time, the space occupied by the drive system 200 in the cabin of the vehicle is further reduced. For the sake of convenience, the state in which the stator 240 drives the drive rotor 230 to rotate is referred to as the drive assembly 200 being in the driving state, and the state in which the stator 240 generates an induced electromotive force in the alternating magnetic field formed by the rotation of the power generation rotor 220 is referred to as the drive assembly 200 being in the power generation state. The stator 240 is used to drive the drive rotor 230 to rotate, and / or, when the power generation rotor 220 rotates, it generates electrical energy. It can be understood that the drive assembly 200 can be in the power generation state alone, can be in the driving state alone, or can be in the power generation state and the driving state at the same time. It should be noted that the generating rotor 220 and the driving rotor 230 can share a stator 240 in any way. Exemplarily, the generating rotor 220 and the driving rotor 230 are both located inside the stator 240, and the generating rotor 220 and the driving rotor 230 are spaced apart along the length direction of the stator 240; Exemplarily, the generating rotor 220 and the driving rotor 230 are respectively located inside and outside the stator 240, forming an inner rotor and an outer rotor, respectively.

[0037] An embodiment of the present invention provides a vehicle drive system, which includes a first drive motor connected to a first wheel through a first transmission system, and a drive assembly connected to a second wheel through a second transmission system, and the drive assembly can also generate electrical energy. In the width direction of the vehicle, the first wheel and the second wheel are located on both sides of the mass center of the vehicle. The drive assembly can simultaneously realize the driving function and the power generation function, thereby integrating the power generation system of the vehicle with part of the drive system, so that the structure of the drive system is more compact. Among them, the drive assembly includes an engine, a power generation rotor connected to the engine, a driving rotor connected to the second wheel through a second transmission system, and a rotor for driving the driving rotor and capable of generating electrical energy when the power generation rotor rotates, that is, the power generation rotor and the driving rotor of the drive assembly share the same stator, so that the structure of the drive system is more compact, and the space occupied by the drive system in the engine compartment of the vehicle is further reduced.

[0038] In some embodiments, in the axial direction of the stator, the generating rotor and the driving rotor are spaced apart, and both the generating rotor and the driving rotor are located inside or outside the stator, so that the drive assembly has a more compact structure in the radial direction of the stator, further reducing the space occupied by the drive system in the vehicle's cabin.

[0039] In some embodiments, Figure 2 As shown, in the radial direction of the stator 240, the stator 240 is located between the power generation rotor 220 and the driving rotor 230. It can be understood that the power generation rotor 220 and the driving rotor 230 are respectively located inside the stator 240 to form an inner rotor, and the other is located outside the stator 240 to form an outer rotor, thereby further reducing the size of the drive assembly 200 in the length direction and further reducing the space occupied by the drive system in the vehicle cabin. In some embodiments, as Figure 2 As shown, in the radial direction of the stator 240, the driving rotor 230 is located outside the stator 240 to form an outer rotor, and the power generation rotor 220 is located inside the stator 240 to form an inner rotor. It should be noted that the driving rotor 230 is used to output driving torque to the first wheel, that is, the driving rotor 230 needs to drive the vehicle. By using the driving rotor 230 as the outer rotor of the driving assembly 200, the driving rotor 230 can have a larger moment of inertia, so that the driving rotor 230 can generate a larger torque during rotation, thereby better driving the vehicle.

[0040] In some embodiments, Figure 3As shown, the first transmission system 300 can be connected to the first wheel 11. It can be understood that when the first transmission system 300 is connected to the first wheel 11, the first drive motor 100 can drive the first wheel 11 and the second wheel at the same time through the first transmission system 300. At the same time, the first transmission system 300 has a switching structure 310, which is used to switch the first transmission system 300 and the second wheel 12 between a connected state and a disconnected state. When the first transmission system 300 and the second wheel 12 are in a connected state, the first drive motor 100 can transmit torque to the first wheel 11 and the second wheel 12 at the same time through the first transmission system 300. When the first transmission system 300 and the second wheel 12 are in a disconnected state, the first drive motor 100 can only transmit torque to the first wheel 11 through the first transmission system 300. In order to avoid mutual influence between the power generation rotor 220 and the driving rotor 230 of the driving component 200, the driving component 200 is either in a driving state or in a power generation state, that is, the driving rotor 230 is locked when the power generation rotor 220 rotates to generate power, and the power generation rotor 220 is locked when the driving rotor 230 rotates to output torque; when the driving component 200 is in the driving state, the first transmission system 300 is separated from the second wheel by the switching structure 310, and the first drive motor 100 and the driving rotor 230 can drive the first wheel 11 and the second wheel 12 respectively. When the drive assembly 200 is in the driving state, the drive rotor 230 is locked. If the first drive motor 100 still only drives the first wheel 11, the driving force on both sides of the vehicle will lose balance, which may cause the vehicle to deflect. The first transmission system 300 is connected to the second wheel 12 through the switching structure 310, so that when the drive rotor 230 cannot drive the first wheel 12, the first drive motor 100 can simultaneously drive the first wheel 11 and the second wheel 12 through the first drive system 300, thereby reducing the deflection of the vehicle due to the imbalance of the driving force on both sides. Optionally, when it is detected that the drive assembly 200 is damaged and the drive rotor 230 cannot output torque, the switching structure 310 connects the first transmission system 300 with the second wheel 12, so that when the drive assembly 200 cannot output torque, the first drive motor 100 can still drive both wheels at the same time, and reduce the deflection of the vehicle due to the different driving forces on both sides.

[0041] It should be noted that the switching structure 310 can be any structure that can switch the first transmission system 300 and the second wheel 12 between the connected state and the disconnected state. Based on the different structures of the first transmission system 300, the switching structure 310 can also be different structures. Figure 4 and Figure 6 The structure of the switching structure 310 is exemplarily described. Those skilled in the art should understand that the switching structure 310 can also be Figure 4 and Figure 5 Other structures besides .

[0042] like Figure 4 As shown, the first transmission system 300 also includes a first half-shaft 321 and a second half-shaft 331. The first half-shaft 321 connects the first drive motor 100 and the first wheel 11, and the second half-shaft 331 connects the first drive motor 100 and the second wheel 12. At the same time, the first type of switching structure 310A is a clutch device, which is located on the second half-shaft 331. Specifically, the second half-shaft 331 has a first sub-shaft 3311 and a second sub-shaft 3312. At the same time, the clutch device (the first type of switching structure 310A) includes a first part 311A ​​and a second part 312A. The first sub-shaft 3311 connects the first drive motor 100 and the first part 311A, and the second sub-shaft 3312 connects the second part 312A and the second wheel 12. When the first part 311A ​​and the second part 312A are in a combined state, torque can be transmitted between the first sub-shaft 3311 and the second part 3312 through the clutch device, so that the torque of the first drive motor 100 can be transmitted to the second wheel 12, that is, the first drive motor 100 and the second wheel 12 are in a connected state; when the first part 311A ​​and the second part 312A are in a separated state, power between the first sub-shaft 3311 and the second sub-shaft 3312 cannot be transmitted, and the first sub-shaft 3311 and the first part 311A ​​idle under the drive of the first drive motor 100, thereby interrupting the power transmission between the first drive motor 100 and the second wheel 12, that is, the first drive motor 100 and the second wheel 12 are in a separated state. Optionally, the first half-shaft 321 and the second half-shaft 331 are connected via a differential 500, so that when the first wheel 11 and the second wheel 12 are driven simultaneously by the first drive motor 100, a speed difference can be created between the first wheel 11 and the second wheel 12 through the differential 500, and the torque of the first drive motor 100 is adaptively distributed according to the torque requirements of the first wheel 11 and the second wheel 12 through the differential 500.

[0043] like Figure 5As shown, the first transmission system 300 also includes: a first transmission shaft 322 and a second transmission shaft 332, the first transmission shaft 322 connects the first drive motor 100 and the first wheel 11, and the first transmission shaft 322 connects the first drive motor 100 and the second wheel 12, that is, the first transmission shaft 322 can transmit the torque of the first drive motor 100 to the first wheel 11 and the second wheel 12 at the same time; the second transmission shaft 332 connects the first drive motor 100 and the first wheel 11, that is, the second transmission shaft 332 can only transmit the torque of the first drive motor 100 to the first wheel 11, and at the same time, the second transmission shaft 332 is sleeved on the outside of the first transmission shaft 322, so that the first transmission shaft 322 and the second transmission shaft 332 are coaxially arranged, so that the central axes of the first transmission shaft 322 and the second transmission shaft 332 can coincide with the rotation axis of the wheel. Another type of switching structure includes a gear assembly. By switching the meshing state or rotation state of the gear assembly, the first drive motor 100 and the first transmission shaft 322 can be connected, that is, the torque of the first drive motor 100 can be transmitted to the first transmission shaft 322, so that the first drive motor 100 and the second wheel 12 are connected, or the first drive motor 100 and the second transmission shaft 332 can be connected, that is, the torque of the first drive motor 100 can be transmitted to the second transmission shaft 332, so that the first drive motor 100 and the second wheel 12 are separated. The gear assembly can be a fixed axis gear or a planetary gear system. Figure 5 and Figure 6 The structure and function of a switching structure in the form of a gear assembly are exemplarily described.

[0044] like Figure 5As shown, the second type of switching structure 300B includes: a first gear 310B, a second gear 320B and a third gear 330B, the first gear 310B is fixedly connected to the first transmission shaft 322, the second gear 320B is fixedly connected to the second transmission shaft 332, and the third gear 330B is connected to the first drive motor 100. At the same time, the third gear 330B can move between a first position and a second position. At the first position, the third gear 330B is meshed with the first gear 310B, so that the first drive motor 100 can be moved between the first gear 310B and the third gear 330B. The third gear 330B meshes with the second gear 320B, so that the first drive motor 100 can be transmitted to the second transmission shaft 332 through the meshing of the second gear 320B and the third gear 330B, so that the torque of the first drive motor 100 is only transmitted to the first wheel 11, that is, the first drive motor 100 is in a disconnected state with the second wheel 12.

[0045] like Figure 6 As shown, in Figure 5Based on the structure of the first transmission system shown, the third type of switching structure 300C includes: a sun gear 310C, a planetary gear 320C, an outer gear ring 330C and a brake 340C. The sun gear 310C is fixedly connected to the second transmission shaft 332, the planetary gear 320C is externally meshed with the sun gear 310C, and is fixedly connected to the first transmission shaft 322 through the planetary carrier 350C, and the outer gear ring 330C is internally meshed with the planetary gear 320C and is connected to the first drive motor 100. At the same time, the brake 340C can lock the rotation of the sun gear 310C or lock the rotation of the planetary gear 320C around the center of the sun gear 310C, that is, lock the revolution of the planetary gear 320C around the sun gear 310C. At this time, the planetary gear 320C can still rotate around its own center; when the brake 340C locks the rotation of the sun gear 310C, the torque of the outer ring gear 330C can be transmitted to the first transmission shaft 322 through the revolution of the planetary gear 320C and the planetary carrier 350, so that the first transmission shaft 322 can be driven by the planetary gear 320C. The torque of the first drive motor 100 can be transmitted to the first wheel 11 and the second wheel 12 at the same time, that is, the first drive motor 100 is connected to the second wheel. When the brake 340C locks the revolution of the planetary gear 320C, the torque of the outer ring gear 330C can be transmitted to the second transmission shaft 332 through the planetary gear 320C and the sun gear 310C, so that the torque of the first drive motor 100 can only be transmitted to the first wheel 11, that is, the first drive motor 100 is separated from the second wheel. Optionally, the first drive shaft also has a differential, so that there can be a speed difference between the first wheel and the second wheel.

[0046] The embodiment of the present invention also provides a control method of a drive system, the control method is applied to Figures 1 to 6 A drive system for a vehicle as shown in any one of the drawings, wherein the drive system has a switching structure capable of switching the connection state between the first drive motor and the second wheel.

[0047] In some embodiments, Figure 7 As shown, the control method of the driving system of the vehicle includes:

[0048] Step S101: When the remaining power of the vehicle is lower than a preset power threshold, the drive component is controlled to be in a power generation state; when the remaining power of the vehicle is not lower than the preset power threshold, the drive component is controlled to be in a driving state.

[0049] It can be understood that when the remaining power of the vehicle is insufficient, the drive assembly is controlled to be in a power generation state to charge the vehicle's power battery, specifically, the power generation rotor is driven to rotate, thereby generating an induced electromotive force in the stator; when the remaining power of the vehicle is sufficient, the drive assembly is controlled to be in a driving state to drive the vehicle, specifically, an alternating current is introduced into the stator so that the stator drives the drive rotor to rotate, thereby driving the wheels to rotate through the second transmission system. Among them, when the drive assembly is in a power generation state, the drive rotor is locked, and when the drive assembly is in a driving state, the power generation rotor is locked, thereby reducing the mutual influence between the drive rotor and the power generation rotor.

[0050] Step S102: when the drive assembly is in the driving state, the switching structure is controlled to make the first drive motor and the second wheel in a separated state, and the first drive motor is controlled to drive the first wheel to rotate; when the drive assembly is in the power generation state, the switching structure is controlled to make the first drive motor and the second wheel in a connected state, and the first drive motor is controlled to drive the first wheel and the second wheel.

[0051] It can be understood that when the drive component is in the driving state, the switching structure makes the first drive motor and the second wheel in a separated state, so that the first wheel and the second wheel can be driven respectively by the driving rotor and the first drive motor, thereby realizing distributed drive of the first wheel and the second wheel; when the drive component is in the power generation state, the driving rotor is locked, and the drive component can no longer drive the first wheel. In order to prevent the vehicle from deflecting under the action of unbalanced driving force on both sides, the first drive motor and the second wheel are connected through the switching structure, so that the torque of the first drive motor can be transmitted to the first wheel and the second wheel at the same time.

[0052] Among them, according to the different structures of the switching structure and the first transmission system, the specific process of the switching structure switching the first drive motor and the second wheel between the connected state and the disconnected state is different. The process is exemplified below in combination with different types of switching structures.

[0053] In the structure of the first transmission system Figure 4 As shown, and the first type of switching structure is as follows Figure 4 In the illustrated case, the first transmission shaft comprises a first half shaft connected to the first wheel and a second half shaft connected to the second wheel, and the first type of switching structure comprises a clutch device, which is located on the second half shaft.

[0054] Controlling the switching structure to put the first drive motor and the second wheel in a disengaged state includes: controlling the clutch device to be in a disengaged state so that the torque of the first drive motor cannot be transmitted to the second wheel through the second half shaft, thereby putting the first drive motor and the second wheel in a disengaged state; controlling the switching structure to put the first drive motor and the second wheel in a connected state includes: controlling the clutch device to be in a connected state so that the torque of the first drive motor can be transmitted to the first wheel and the second wheel through the first half shaft and the second half shaft respectively, thereby putting the first drive motor and the second wheel in a connected state. In the structure of the first transmission system as shown in FIG. Figure 5 As shown, and the switching structure includes a gear assembly,

[0055] Controlling the switching structure so that the first drive motor and the second wheel are in a separated state includes: controlling the gear assembly so that the first drive motor and the second transmission shaft are in a connected state; controlling the switching structure so that the first drive motor and the second wheel are in a connected state includes: controlling the gear assembly so that the first drive motor and the first transmission shaft are in a connected state. Based on different gear assembly structures, the control method of the gear assembly is also different. The control method of each gear assembly is exemplarily described below in combination with different gear assembly structures.

[0056] like Figure 5 In the case shown, the second type of switching structure includes a fixed shaft gear set. Specifically, the second type of switching structure includes a first gear fixedly connected to the first transmission shaft, a second gear fixedly connected to the second transmission shaft, and a third gear connected to the first drive motor, and the third gear can engage with the first gear or the second gear respectively by moving between a first position and a second position.

[0057] Controlling the gear assembly so that the first drive motor and the second transmission shaft are in a connected state includes: controlling the third gear to be in the second position so that the third gear is meshed with the second gear, so that the torque of the first drive motor is transmitted to the second transmission shaft through the meshing of the third gear and the second gear, and is transmitted to the first wheel through the second transmission shaft, and is not transmitted to the first transmission shaft and is transmitted to the second wheel, that is, the first drive motor and the second wheel are in a separated state; controlling the gear assembly so that the first drive motor and the first transmission shaft are in a connected state, includes: controlling the third gear to be in the first position so that the third gear is meshed with the first gear, so that the torque of the first drive motor is transmitted to the first transmission shaft through the meshing of the third gear and the second gear, and is simultaneously transmitted to the first wheel and the second wheel through the first transmission shaft, that is, the first drive motor and the second wheel are in a connected state.

[0058] In the structure of the first transmission system Figure 5 As shown, and the third type of switching structure is as follows Figure 6In the case shown, the third type of switching structure includes a planetary gear train. Specifically, the third type of switching structure includes: a sun gear fixedly connected to the second transmission shaft, a planetary gear meshing with the outside of the sun gear and connected to the first transmission shaft through a planetary carrier, an outer ring gear meshing with the inside of the planetary gear and connected to the first drive motor, and a brake capable of locking the rotation of the sun gear based on the revolution of the planetary gear.

[0059] Controlling the gear assembly so that the first drive motor and the second transmission shaft are in a connected state includes: controlling the brake to lock the rotation of the center of the sun gear of the planetary gear sleeve, so that the torque of the first drive motor drives the sun gear to rotate through the rotation of the planetary gear, and drives the second transmission shaft to rotate through the sun gear, and transmits the torque to the first wheel through the second rotating shaft, and will not transmit it to the second wheel through the first transmission shaft, that is, the first drive motor and the second wheel are in a separated state; controlling the gear assembly so that the first drive motor and the first transmission shaft are in a connected state includes: controlling the brake to lock the rotation of the sun gear, so that the torque of the first drive motor is transmitted to the first transmission shaft through the revolution of the planetary gear and the planetary carrier, and transmits the torque to the first wheel and the second wheel at the same time through the first transmission shaft, that is, the first drive motor and the second wheel are in a connected state.

[0060] The embodiment of the present invention also provides a control method of a drive system. Figure 1 or Figure 2Therefore, the drive system also includes a second drive motor, which can transmit torque to the third wheel and the fourth wheel through the third transmission system, wherein the third wheel 13 and the fourth wheel 14 are on the same drive axle, and the drive axle where the third wheel 13 and the fourth wheel 14 are located is different from the drive axle where the first wheel 11 and the second wheel 12 are located. It can be understood that in the length direction of the vehicle, the third wheel and the first wheel are located on both sides of the mass center of the vehicle, and the fourth wheel and the second wheel are located on both sides of the mass center of the vehicle. In the width direction of the vehicle, the third wheel and the fourth wheel are located on both sides of the mass center of the vehicle. It can be understood that the drive system of the vehicle has multiple drive axles, the first drive motor, the drive assembly, the first wheel and the second wheel form the first drive axle of the vehicle, and the second drive motor, the third wheel and the fourth wheel form the second drive axle of the vehicle, and the vehicle is driven by the first drive axle and the second drive axle respectively. The drive axle formed by the second drive motor, the third wheel and the fourth wheel can be a central drive frame that drives the third wheel and the fourth wheel simultaneously through a second drive motor, or a distributed drive frame that drives the third wheel and the fourth wheel respectively through two second drive motors. For the sake of convenience, the drive axle formed by the drive assembly, the first drive motor, the first wheel and the second wheel is referred to as the front axle, and the drive axle formed by the second drive motor, the third wheel and the fourth wheel is referred to as the rear axle. The control method of the drive system with the drive axle is exemplarily described below.

[0061] In some embodiments, Figure 8 As shown, the control method applied to the drive system with multiple drive axles includes:

[0062] Step S201: When the remaining power of the vehicle is lower than a preset power threshold, the drive component is controlled to be in a power generation state; when the remaining power of the vehicle is not lower than the preset power threshold, the drive component is controlled to be in a driving state.

[0063] It can be understood that when the remaining power of the vehicle is insufficient, the drive assembly is controlled to be in a power generation state to charge the vehicle's power battery, specifically, the power generation rotor is driven to rotate, thereby generating an induced electromotive force in the stator; when the remaining power of the vehicle is sufficient, the drive assembly is controlled to be in a driving state to drive the vehicle, specifically, an alternating current is introduced into the stator so that the stator drives the drive rotor to rotate, thereby driving the wheels to rotate through the second transmission system. Among them, when the drive assembly is in a power generation state, the drive rotor is locked, and when the drive assembly is in a driving state, the power generation rotor is locked, thereby reducing the mutual influence between the drive rotor and the power generation rotor.

[0064] Step S202: when the drive assembly is in a driving state, control the first drive motor to drive the first wheel to rotate; when the drive assembly is in a power generation state, control the first drive motor to stop and increase the torque output by the second drive motor.

[0065] It can be understood that when the drive component is in the driving state, the first wheel and the second wheel are driven respectively by the driving rotor and the first drive motor to realize the distributed drive of the first wheel and the second road; when the drive component is in the power generation state, the driving rotor is locked, and the drive component cannot continue to drive the first wheel. In order to prevent the vehicle from deflecting under the action of unbalanced driving force on both sides, the first drive motor is shut down and the torque output by the second drive motor is increased, that is, the front axle is only used for power generation and not for driving the vehicle. At the same time, the torque output by the rear axle is increased to meet the power demand of the vehicle, and the power of the vehicle will not change when the front axle is switched from the driving state to the power generation state only, so that the drive of the vehicle can undergo a step change, so that the shape of the vehicle is stable.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A vehicle driving system, characterized in that: The drive system comprises: A first driving motor is connected to the first wheel through a first transmission system; a drive assembly connected to a second wheel via a second transmission system, wherein the first wheel and the second wheel are on the same drive axle; Wherein, the driving component comprises: A power generating rotor, used to be connected to the engine and capable of rotating under the drive of the engine; a driving rotor connected to the second wheel via the second transmission system; The stator is used to drive the driving rotor to rotate and / or to generate electrical energy when the generating rotor rotates.

2. The drive system according to claim 1, characterized in that: In the axial direction of the stator, the power generation rotor and the driving rotor are spaced apart from each other, and the power generation rotor and the driving rotor are both located outside the stator or both located inside the stator.

3. The drive system according to claim 1, characterized in that: In a radial direction of the stator, the stator is located between the driving rotor and the power generating rotor.

4. The drive system according to claim 3, characterized in that: In the radial direction of the stator, the driving rotor is located outside the stator, and the power generation rotor is located inside the stator.

5. The drive system according to claim 1, characterized in that: The first transmission system is capable of connecting to the second wheel, and the first transmission system has a switching structure, and the switching structure is used to switch the first drive motor and the second wheel between a connected state and a disconnected state. In the connected state, the first drive motor is capable of transmitting torque to the second wheel, and in the disconnected state, the power transmission between the first drive motor and the second wheel is interrupted.

6. The drive system according to claim 5, characterized in that: The first transmission system further comprises: a first half shaft, connecting the first drive motor and the first wheel; a second half shaft, connecting the first drive motor and the second wheel; Wherein, the switching structure includes a clutch device, and the clutch device is located on the second half shaft, and is used to switch the first drive motor and the second wheel between a connected state and a disconnected state.

7. The drive system according to claim 5, characterized in that: The first transmission system further comprises: a first transmission shaft, connecting the first drive motor and the first wheel, and connecting the first drive motor and the second wheel; a second transmission shaft, connecting the first drive motor and the first wheel, the second transmission shaft being sleeved on the outside of the first transmission shaft; Wherein, the switching structure includes a gear assembly, and the gear assembly can connect the first drive motor with the first transmission shaft, or connect the first drive motor with the second transmission shaft.

8. The drive system according to claim 7, characterized in that: The gear assembly comprises: A first gear, fixedly connected to the first transmission shaft; A second gear is fixedly connected to the second transmission shaft The third gear is connected to the first driving motor and can move between a first position and a second position. At the first position, the third gear is meshed with the first gear, and at the second position, the third gear is meshed with the second gear.

9. The drive system according to claim 7, characterized in that: The gear assembly comprises: The gear assembly comprises: A sun gear, fixedly connected to the second transmission shaft; a planetary gear, meshing with the sun gear externally and fixedly connected to the first transmission shaft via a planetary carrier; An outer ring gear, meshing with the planetary gear and connected to the first drive motor; The brake is capable of locking the rotation of the sun gear or locking the rotation of the planetary gear around the center of the sun gear.

10. A method for controlling a vehicle driving system, characterized in that: The control method is applied to a drive system as claimed in any one of claims 1 to 9, and the first transmission system has a switching structure; The control method comprises: When the remaining power of the vehicle is lower than a preset power threshold, the driving component is controlled to be in a power generation state; when the remaining power of the vehicle is not lower than the preset power threshold, the driving component is controlled to be in a driving state; When the drive assembly is in a driving state, the switching structure is controlled to make the first drive motor and the second wheel in a disconnected state, and the first drive motor is controlled to drive the first wheel to rotate; when the drive assembly is in a power generation state, the switching structure is controlled to make the first drive motor and the second wheel in a connected state, and the first drive motor is controlled to drive the first wheel and the second wheel to rotate; Wherein, controlling the driving component to be in a power generation state includes: driving the power generation rotor to rotate, and locking the driving rotor; Said controlling the driving component to be in a driving state comprises: The stator is controlled to drive the driving rotor to rotate and lock the generating rotor.

11. The control method according to claim 10, characterized in that: The first transmission system includes a first half shaft and a second half shaft, the switching structure includes a clutch device, and the clutch device is located on the second half shaft; The controlling the switching structure so that the first drive motor and the second wheel are in a separated state includes: Controlling the clutch device to be in a disengaged state so that the first drive motor and the second wheel are in a disengaged state; The controlling the switching structure so that the first drive motor and the second wheel are in a connected state includes: The clutch device is controlled to be in an engaged state so that the first drive motor and the second wheel are in a connected state.

12. The control method according to claim 10, characterized in that: The first transmission system includes a first transmission shaft and a second transmission shaft, and the switching structure includes a gear assembly; The controlling the switching structure so that the first drive motor and the second wheel are in a separated state includes: Controlling the gear assembly to connect the first drive motor with the second transmission shaft; The controlling the switching structure so that the first drive motor and the second wheel are in a connected state includes: The gear assembly is controlled to connect the first drive motor with the first transmission shaft.

13. The control method according to claim 12, characterized in that: The gear assembly comprises: a first gear, a second gear and a third gear; The step of controlling the gear assembly so that the first drive motor and the second transmission shaft are in a connected state includes: Controlling the third gear to be located at the second position so that the third gear is meshed with the second gear; The step of controlling the gear assembly so that the first drive motor and the first transmission shaft are in a connected state includes: The third gear is controlled to be located at the first position so that the third gear is meshed with the first gear.

14. The control method according to claim 12, characterized in that: The gear assembly includes: a sun gear, a planetary gear, an outer gear ring and a brake; The step of controlling the gear assembly so that the first drive motor and the second transmission shaft are in a connected state comprises: Controlling the brake to lock the planetary gear from rotating around the center of the sun gear, so that the outer gear ring drives the sun gear to rotate; The step of controlling the gear assembly so that the first drive motor and the first transmission shaft are in a connected state includes: The controller is controlled to lock the rotation of the sun gear, so that the outer gear ring drives the planetary gears to rotate around the center of the sun gear.

15. A method for controlling a vehicle driving system, characterized in that: The control method is applied to the drive system according to any one of claims 1 to 4, and the drive system further comprises: a second drive motor, the second drive motor being connected to a third wheel and a fourth wheel of the vehicle through a third transmission system, the third wheel and the fourth wheel being on the same drive axle, and the drive axle on which the third wheel and the fourth wheel are located is different from the drive axle on which the first wheel and the second wheel are located; The control method comprises: When the remaining power of the vehicle is lower than a preset power threshold, the driving component is controlled to be in a power generation state; when the remaining power of the vehicle is not lower than the preset power threshold, the driving component is controlled to be in a driving state; When the drive assembly is in a driving state, the first drive motor is controlled to drive the first wheel to rotate; when the drive assembly is in a power generation state, the first drive motor is controlled to stop and the torque output by the second drive motor is increased; Wherein, controlling the driving component to be in a power generation state includes: driving the power generation rotor to rotate, and locking the driving rotor; Said controlling the driving component to be in a driving state comprises: The stator is controlled to drive the driving rotor to rotate and lock the generating rotor.

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