A hybrid system for a vehicle, a vehicle, and a method for controlling the vehicle.

Abstract

This disclosure provides a hybrid system for a vehicle, a vehicle, and a vehicle control method. The hybrid system drives the front and rear wheels of the vehicle separately in multiple operating modes. It includes a first shaft, a first clutch assembly, a second shaft, a first motor, a planetary gear set assembly, a second motor, and a two-speed planetary gear mechanism, sequentially connected between an engine and a transfer case. The first shaft is connected to the second shaft via the first clutch assembly. The first motor and the planetary gear set assembly are mounted on the second shaft. The second shaft is connected to the second motor via the planetary gear set assembly. The two-speed planetary gear mechanism is connected to the transfer case via a third shaft. The planetary gear set assembly is also connected to the differential assembly via the second clutch assembly. This disclosure satisfies the vehicle's layout space requirements while achieving the four-wheel drive and energy-saving requirements of a longitudinally mounted hybrid system. Furthermore, it is compact, small in size, and lightweight, reducing the cost burden of applying a hybrid system.

Description

Technical Field

[0001] This disclosure relates to the field of hybrid drive technology for vehicles, and particularly to a hybrid system for a vehicle, a vehicle, and a method for controlling the vehicle. Background Technology

[0002] Currently, most dual-motor hybrid systems developed domestically and internationally are designed with the goal of saving fuel for the engine, with less consideration given to fully utilizing the high-efficiency range of the electric motor. While this design can achieve fuel consumption targets in the short term, it will be difficult to meet future fuel consumption requirements as national fuel consumption standards become increasingly stringent. This necessitates a shift in design thinking. Without a significant breakthrough in battery technology, it is necessary to develop dual-motor hybrid systems based primarily on electric motor drive. Such hybrid systems need to fully explore the efficient utilization of the electric motor, while the engine's role is to play a relatively efficient role when the vehicle's battery charge is insufficient.

[0003] To meet consumers' demands for a superior electric vehicle driving experience without range anxiety, automakers need to develop dual-motor hybrid systems based primarily on electric drive. A significant drawback of current range-extended electric vehicles is their high fuel consumption in range-extended mode when the battery is low, especially at high speeds. Furthermore, the performance of electric vehicles in range-extended mode is noticeably reduced, only meeting basic driving requirements. Summary of the Invention

[0004] The purpose of this disclosure is to provide a hybrid system for a vehicle, a vehicle, and a method for controlling the vehicle, in order to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the embodiments of this disclosure adopt the following technical solutions:

[0006] A hybrid system for a vehicle, used to drive the front and rear wheels of the vehicle separately in multiple operating modes, includes a first shaft, a first clutch assembly, a second shaft, a first motor, a planetary gear set assembly, a second motor, and a two-speed planetary gear mechanism connected sequentially between an engine and a transfer case. The first shaft is connected to the second shaft via the first clutch assembly. The first motor and the planetary gear set assembly are mounted on the second shaft. The second shaft is connected to the second motor via the planetary gear set assembly. The two-speed planetary gear mechanism is connected to the transfer case via a third shaft. The planetary gear set assembly is also connected to a differential assembly via the second clutch assembly.

[0007] In some embodiments, the planetary gear assembly includes a first sun gear, a first planet carrier, and a first ring gear; the two-speed planetary mechanism includes a second sun gear, a second planet carrier, a second ring gear, a brake, and a clutch; the driving end of the clutch is fixedly connected to the second ring gear, and the driven end of the clutch is fixedly connected to the second planet carrier.

[0008] In some embodiments, the first clutch assembly includes a first clutch driving end and a first clutch driven end, the first shaft is fixedly connected to the first clutch driving end of the first clutch assembly; the first end of the second shaft is connected to the first clutch driven end of the first clutch assembly, and its second end is fixedly connected to the first sun gear in the planetary gear assembly.

[0009] In some embodiments, the first motor shaft of the first motor is fixedly connected to the first planetary carrier in the planetary gear assembly, and a first gear is provided on the first motor shaft. The first end of the second motor shaft of the second motor is fixedly connected to the first gear ring in the planetary gear assembly, and the second end of the second motor shaft is fixedly connected to the second sun gear in the two-speed planetary mechanism. The second planetary carrier in the two-speed planetary mechanism is fixedly connected to the third shaft.

[0010] In some embodiments, the hybrid system further includes a fourth shaft and a fifth shaft, on which a second gear, a third gear and a fourth gear are fixedly disposed, the second clutch assembly is disposed on the fifth shaft, on which a fifth gear, a sixth gear and a seventh gear are disposed, and on the input shaft of the differential assembly an eighth gear is fixedly disposed.

[0011] In some embodiments, the second clutch assembly includes a second clutch driving end, a third clutch driving end, and a second clutch driven end. The two ends of the fifth shaft are fixedly connected to the seventh gear and the second clutch driven end, respectively. The fifth gear is fixedly connected to the second clutch driving end, and the sixth gear is fixedly connected to the third clutch driving end. The fifth gear, the sixth gear, the second clutch driving end, and the third clutch driving end are loosely fitted on the fifth shaft. The first gear meshes with the second gear, the third gear meshes with the fifth gear, the fourth gear meshes with the sixth gear, and the seventh gear meshes with the eighth gear.

[0012] In some embodiments, the first shaft is arranged parallel to the rotation axis of the first clutch assembly, the second shaft, the rotation axis of the first motor, the rotation axis of the planetary gear assembly, the rotation axis of the second motor, the rotation axis of the two-speed planetary mechanism, the third shaft, the fourth shaft, the fifth shaft, and the rotation axis of the second clutch assembly; the first shaft is arranged perpendicular to the rotation axis of the differential assembly; and the first shaft is arranged perpendicular to the rotation axes of the front and rear wheels.

[0013] This disclosure also provides a vehicle that includes the hybrid system described in any of the preceding embodiments.

[0014] This disclosure also provides a vehicle control method, wherein the vehicle is the vehicle described above, the vehicle is operating in four-wheel drive mode, and the control method includes:

[0015] Determine whether the front wheel is about to slip; if the front wheel is about to slip, control the first motor to enter the power generation state.

[0016] When the torque output by the vehicle is greater than or equal to the torque requirement, the electrical energy generated by the first motor is stored.

[0017] When the torque output by the vehicle is less than the torque requirement and the torque received by the rear wheels is less than the slip limit torque of the rear wheels, the generated electrical energy is transmitted to the second motor to drive the rear wheels; and / or

[0018] Determine whether the rear wheel is about to slip; if the rear wheel is about to slip, control the second motor to enter the power generation state.

[0019] When the torque output by the vehicle is greater than or equal to the torque requirement, the electrical energy generated by the second motor is stored.

[0020] When the torque output by the vehicle is less than the torque requirement and the torque obtained by the front wheel is less than the slip limit torque of the front wheel, the generated electrical energy is transmitted to the first motor to drive the front wheel.

[0021] This disclosure also provides a vehicle control method, wherein the vehicle is the vehicle described above, the vehicle is operating in four-wheel drive mode, and the control method includes:

[0022] When the vehicle speed is less than a preset threshold and the acceleration is greater than a preset threshold, when the obtained torque of the front wheel is greater than or equal to the slip limit torque of the front wheel, the difference between the obtained torque of the rear wheel and the slip limit torque of the rear wheel is obtained.

[0023] When the vehicle's battery charge is greater than or equal to a preset threshold, the second motor is controlled to drive the rear wheels based on the difference.

[0024] When the vehicle's battery charge is below a preset threshold, the engine's output torque is increased, and the portion of the torque obtained by the first motor exceeding the slippage limit torque of the front wheels is converted into electrical energy and transmitted to the second motor to drive the second motor; and / or

[0025] When the vehicle speed is greater than or equal to a preset threshold and the acceleration is less than a preset threshold, and when the vehicle battery charge is greater than or equal to a preset threshold, the output torque of the engine is reduced so that the torque obtained by the rear wheel is equal to the slip limit torque of the rear wheel.

[0026] The difference between the obtained torque of the front wheel and the slip limit torque of the front wheel is obtained, and the first motor is controlled to drive the front wheel based on the difference;

[0027] When the vehicle battery charge is less than a preset threshold, the second motor is controlled to enter the power generation state, and the torque portion obtained by the second motor that exceeds the slip limit torque of the rear wheel is converted into electrical energy and transmitted to the first motor to drive the first motor.

[0028] Compared with the prior art, the embodiments disclosed herein can not only meet the layout space requirements of the whole vehicle, but also realize the four-wheel drive requirements and energy-saving requirements of the longitudinal hybrid system. At the same time, it has a compact structure, small size and light weight, reducing the cost burden of applying the hybrid system.

[0029] The embodiments disclosed herein can achieve inter-axle differential locking function without the mechanical structure of inter-axle differential lock, thereby improving the off-road passability of the vehicle. At the same time, the elimination of the mechanical locking structure reduces costs and results in a compact structure.

[0030] Furthermore, the embodiments disclosed herein enable the vehicle to always operate at its maximum boundary acceleration state to achieve the theoretical fastest mode, providing the vehicle with intelligent dynamic drive control technology for acceleration, and realizing intelligent driving of the vehicle. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the vehicle layout of a hybrid system with a longitudinally mounted dual-motor structure according to an embodiment of this disclosure.

[0033] Figure 2 This is a schematic diagram of the hybrid system with a longitudinally mounted dual-motor structure in an embodiment of this disclosure. Detailed Implementation

[0034] Various embodiments and features of this disclosure are described herein with reference to the accompanying drawings.

[0035] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this disclosure will be apparent to those skilled in the art.

[0036] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

[0037] These and other features of this disclosure will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0038] It should also be understood that although this disclosure has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this disclosure, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0039] The above and other aspects, features and advantages of this disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0040] Specific embodiments of this disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this disclosure, which may be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure this disclosure. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use this disclosure in a variety of substantially any suitable detailed structures.

[0041] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in still another embodiment,” all of which may refer to one or more of the same or different embodiments according to this disclosure.

[0042] The first embodiment of this disclosure provides a vehicle employing a longitudinally mounted dual-motor hybrid system, such as... Figure 1As shown, the vehicle includes an engine 100, a hybrid system 200, and a drive axle 300 arranged sequentially along the longitudinal direction of the vehicle. The hybrid system 200 is connected to the front wheels of the vehicle and also to the rear wheels of the vehicle through the drive axle 300. Here, longitudinal direction refers to the length direction of the vehicle. In this way, the power of the engine 100 can be transmitted to the drive axle 300 located at the rear of the vehicle through the hybrid system 200, thereby driving the rear wheels of the vehicle. Of course, the power of the engine 100 can also directly drive the front wheels of the vehicle through the hybrid system 200.

[0043] Furthermore, such as Figure 2 As shown, the hybrid system 200 includes a first shaft 201, a first clutch assembly 210, a second shaft 202, a first motor 220, a planetary gear set assembly 230, a second motor 240, and a two-speed planetary gear mechanism 250, which are sequentially connected between the engine 100 and the transfer case 300. The first shaft 201 is used to connect the engine 100, and the two-speed planetary gear mechanism 250 is connected to the transfer case 300 through a third shaft 260. The two-speed planetary gear mechanism 250 can realize transmission in low speed gear and high speed gear.

[0044] Specifically, the first shaft 201 receives the power and speed output by the engine 100 by connecting to the output shaft of the engine 100; the first shaft 201 is connected to the second shaft 202 through the first clutch assembly 210; the first motor 220 is disposed on the second shaft 202, wherein the first motor shaft 221 of the first motor 220 and the second shaft 202 are arranged in an inner and outer nested manner; the planetary gear assembly 230 is disposed on the second shaft 202, and the second shaft 202 is connected to the second motor 240 through the planetary gear assembly 230.

[0045] Further, the first clutch assembly 210 includes a first clutch driving end 211 and a first clutch driven end 212; the planetary gear assembly 230 includes a first sun gear 231, a first planet carrier 232 and a first ring gear 233; the two-speed planetary mechanism 250 includes a second sun gear 251, a second planet carrier 252, a second ring gear 253, a brake 254 and a clutch 255, wherein the brake 254 is used to control the rotation and stopping of the second ring gear 253, the driving end of the clutch 255 is fixedly connected to the second ring gear 253, and the driven end of the clutch 255 is fixedly connected to the second planet carrier 252.

[0046] Thus, the first shaft 201 is fixedly connected to the first clutch driving end 211 of the first clutch assembly 210; the first end of the second shaft 202 is connected to the first clutch driven end 212 of the first clutch assembly 210, and its second end is fixedly connected to the first sun gear 231 in the planetary gear assembly 230.

[0047] Furthermore, the first motor shaft 221 of the first motor 220 is fixedly connected to the first planetary carrier 232 in the planetary gear assembly 230, and a first gear 222 is provided on the first motor shaft 221.

[0048] The first end of the second motor shaft 241 of the second motor 240 is fixedly connected to the first gear ring 223 in the planetary gear assembly 230, the second end of the second motor shaft 241 is fixedly connected to the second sun gear 251 in the two-speed planetary mechanism 250, and the second planet carrier 252 in the two-speed planetary mechanism 250 is fixedly connected to the third shaft 260; the third shaft 260 transmits power to the drive axle 300.

[0049] Furthermore, the planetary gear assembly 230 is connected to the differential assembly 2910 via the second clutch assembly 290. The differential assembly 2910 is connected to the front wheels of the vehicle. The second clutch assembly 290 includes a second clutch driving end 291, a third clutch driving end 292, and a second clutch driven end 293.

[0050] The hybrid system further includes a fourth shaft 270 and a fifth shaft 280, wherein a second gear 271, a third gear 272, and a fourth gear 273 are fixedly mounted on the fourth shaft 270; a second clutch assembly 290 is mounted on the fifth shaft 280, wherein a fifth gear 281, a sixth gear 282, and a seventh gear 283 are mounted on the fifth shaft 280; and an eighth gear 2911 is fixedly mounted on the input shaft of the differential assembly 2910.

[0051] The two ends of the fifth shaft 280 are fixedly connected to the seventh gear 283 and the driven end 293 of the second clutch, respectively. The fifth gear 281 is fixedly connected to the driving end 291 of the second clutch, and the sixth gear 282 is fixedly connected to the driving end 292 of the third clutch. The fifth gear 281, the sixth gear 282, the driving end 291 of the second clutch and the driving end 292 of the third clutch are loosely fitted on the fifth shaft 280.

[0052] Specifically, the first gear 222 meshes with the second gear 271, the third gear 272 meshes with the fifth gear 281, the fourth gear 273 meshes with the sixth gear 282, and the seventh gear 283 meshes with the eighth gear 2911.

[0053] Thus, the first shaft 201 is arranged parallel to the rotation axis of the first clutch assembly 210, the second shaft 202, the rotation axis of the first motor 220, the rotation axis of the planetary gear assembly 230, the rotation axis of the second motor 240, the rotation axis of the two-speed planetary mechanism 250, the third shaft 260, the fourth shaft 270, the fifth shaft 280, and the rotation axis of the second clutch assembly 290. The first shaft 201 is arranged perpendicular to the rotation axis of the differential assembly 2910, and simultaneously, the first shaft 201 is arranged perpendicular to the rotation axes of the front and rear wheels.

[0054] The hybrid system 200 described in this embodiment enables the vehicle to operate in multiple modes, including pure electric four-wheel drive, pure electric rear-wheel drive, pure electric front-wheel drive, hybrid four-wheel drive, hybrid rear-wheel drive, hybrid front-wheel drive, and engine-driven four-wheel drive. Specifically, by connecting two motors to the power routes of the front and rear wheels respectively, the vehicle possesses various four-wheel drive modes, thereby achieving various intelligent controls. By controlling the disengagement and engagement of the first clutch assembly 210, the intervention of the engine 100 can be controlled, enabling pure electric driving, hybrid driving, or engine-driven direct drive driving. The second clutch 290 can be controlled... The system controls the vehicle's rear-wheel drive and four-wheel drive modes. In rear-wheel drive mode, the vehicle can achieve pure electric drive and hybrid drive, decoupling the engine speed of the engine 100 from the vehicle speed, allowing the engine 100 to always operate in the high-efficiency range and improving fuel economy. The system also controls the vehicle's front-wheel drive and four-wheel drive modes through the states of the brake 254 and clutch 255 of the two-speed planetary mechanism 250. In front-wheel drive mode, the vehicle can achieve pure electric drive and hybrid drive, decoupling the engine speed of the engine 100 from the vehicle speed, allowing the engine 100 to always operate in the high-efficiency range and improving fuel economy.

[0055] Therefore, the hybrid system and vehicle using longitudinally mounted dual motors disclosed in this embodiment can achieve excellent performance and very low fuel consumption under any operating conditions, which can meet the needs of consumers for, for example, high-end luxury cars.

[0056] The above-mentioned operating modes of the hybrid system 200 are as follows:

[0057] (1) Pure electric four-wheel drive mode

[0058] In the pure electric four-wheel drive mode, the engine 100 is off, the first motor 220 and the second motor 240 are in drive mode, and the first clutch assembly 210 is disengaged.

[0059] In the pure electric four-wheel drive mode, there are two drive power transmission routes, namely:

[0060] The primary drive power transmission route of the vehicle is as follows:

[0061] In low speed gear: the second motor 240 → the second motor shaft 241 → the two-speed planetary mechanism 250 (at this time, the brake 254 in the two-speed planetary mechanism 250 works and brakes the second gear ring 253, and the clutch 255 is in the disengaged state) → the third shaft 260 → the drive axle 300 → the rear wheel of the vehicle.

[0062] In high gear: the second motor 240 → the second motor shaft 241 → the two-speed planetary mechanism 250 (at this time, the brake 254 in the two-speed planetary mechanism 250 is disengaged, and the clutch 255 is engaged to connect the second ring gear 253 to the planet carrier 252) → the third shaft 260 → the drive axle 300 → the rear wheel of the vehicle.

[0063] The second drive power transmission route of the vehicle is as follows:

[0064] In low speed gear: First motor 220 → First motor shaft 221 → First gear 222 → Second gear 271 → Fourth shaft 270 → Third gear 272 → Fifth gear 281 → Second clutch driving end 291 → Second clutch driven end 293 → Fifth shaft 280 → Seventh gear 283 → Eighth gear 2911 → Differential assembly 2910 → Front wheel of the vehicle.

[0065] In high speed gear: motor 220 → first motor shaft 221 → first gear 222 → second gear 271 → fourth shaft 270 → fourth gear 273 → sixth gear 282 → third clutch driving end 292 → second clutch driven end 293 → fifth shaft 280 → seventh gear 283 → eighth gear 2911 → differential assembly 2910 → front wheel of the vehicle.

[0066] (2) pure electric rear-wheel drive mode

[0067] In the pure electric rear-wheel drive mode, the engine 100 is off, the first motor 220 is off, the second motor 240 is in drive mode, the first clutch assembly 210 is disengaged, and the clutch 290 is disengaged.

[0068] The driving power transmission route of the vehicle is as follows:

[0069] In low speed gear: the second motor 240 → the second motor shaft 241 → the two-speed planetary mechanism 250 (at this time, the brake 254 in the two-speed planetary mechanism 250 works and brakes the second gear ring 253, and the clutch 255 is in the disengaged state) → the third shaft 260 → the drive axle 300 → the rear wheel of the vehicle.

[0070] In high gear: the second motor 240 → the second motor shaft 241 → the two-speed planetary mechanism 250 (at this time, the brake 254 in the two-speed planetary mechanism 250 is disengaged, and the clutch 255 is engaged to connect the second ring gear 253 to the second planetary carrier 252) → the third shaft 260 → the drive axle 300 → the rear wheel of the vehicle.

[0071] (3) pure electric front-wheel drive mode

[0072] In the pure electric front-wheel drive mode, the engine 100 is off, the first motor 220 is in drive mode, the second motor 240 is off, the first clutch assembly 210 is disengaged, and the two-speed planetary mechanism 250 is in neutral (at this time, the brake 254 and the clutch 255 in the two-speed planetary mechanism 250 are both disengaged).

[0073] The driving power transmission route of the vehicle is as follows:

[0074] In low speed gear: First motor 220 → First motor shaft 221 → First gear 222 → Second gear 271 → Fourth shaft 270 → Third gear 272 → Fifth gear 281 → Second clutch driving end 291 → Second clutch driven end 293 → Fifth shaft 280 → Seventh gear 283 → Eighth gear 2911 → Differential assembly 2910 → Front wheel of the vehicle.

[0075] In high speed gear: First motor 220 → First motor shaft 221 → First gear 222 → Second gear 271 → Fourth shaft 270 → Fourth gear 273 → Sixth gear 282 → Third clutch driving end 292 → Second clutch driven end 293 → Fifth shaft 280 → Seventh gear 283 → Eighth gear 2911 → Differential assembly 2910 → Front wheel of the vehicle.

[0076] (4) First hybrid four-wheel drive mode:

[0077] In the first hybrid four-wheel drive mode, the engine 100 is in driving mode, the first motor 220 actively controls the speed and is in generating mode, the second motor 240 rotates and is in driving mode, and the first clutch assembly 210 is in engaged mode.

[0078] In this mode, the planetary gear assembly 230 has an inter-axle differential function. The engine 100 is fixedly connected to the first planet carrier 232 in the planetary gear assembly 230. The front wheel drive power route of the vehicle is connected to the first sun gear 231, and the rear wheel drive power route of the vehicle is rigidly connected to the first ring gear 223. Since the planetary gear assembly 230 has two degrees of freedom, when the front and rear wheels of the vehicle rotate at the same speed, the first sun gear 231, the first planet carrier 232, and the first ring gear 223 in the planetary gear assembly 230 will rotate at the same speed or a fixed speed difference. When the front and rear wheels of the vehicle rotate at different speeds, the first sun gear 231, the first planet carrier 232, and the first ring gear 223 in the planetary gear assembly 230 will rotate at different speeds. In this way, the planetary gear assembly 230 has the function of an inter-axle differential, thereby ensuring the smooth operation of the vehicle.

[0079] In this mode, the planetary gear set 230 also has a gear matching function. There are 2 gears in the power transmission route through the first motor 220 (front drive) and 2 gears in the power transmission route through the second motor 240 (rear drive). When the hybrid system 200 is in hybrid four-wheel drive or engine four-wheel drive mode, it can have 4 gears. These 4 gears are obtained by multiplying the 2 gears in the power transmission route through the first motor 220 (front drive) by the 2 gears in the power transmission route through the second motor 240 (rear drive), that is, 2 x 2 = 4 gears, which is based on the planetary gear set 230 to form 4 gears.

[0080] In this mode, the torque distribution between the front and rear wheels can also be adjusted. When the vehicle is in a state of front wheel slippage or the axle load is transferred to the rear axle during rapid acceleration, the first motor 220 generates electricity and reduces the output torque of the front wheels of the vehicle. The electrical energy generated by the first motor 220 is directly provided to the second motor 240 for driving. The power output by the second motor 240 is provided to the rear wheels of the vehicle, thereby increasing the driving torque of the rear wheels.

[0081] In this mode, there are three drive power transmission routes and one power generation transmission route, namely:

[0082] The primary drive power transmission route of the vehicle is as follows:

[0083] The engine 100 → first shaft 201 → planetary gear assembly 230 → motor shaft 241 → second motor 240 → motor shaft 241 → two-speed planetary mechanism 250 → second shaft 260 → drive axle 300 → rear wheel of the vehicle.

[0084] The second drive power transmission route of the vehicle is as follows:

[0085] The sequence is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → first motor shaft 221 → first gear 222 → second gear 271 → fourth shaft 270 → third gear 272 (or fourth gear 273) → fifth gear 281 (or sixth gear 282) → second clutch driving end 291 (or third clutch driving end 292) → second clutch driven end 293 → fifth shaft 280 → seventh gear 283 → eighth gear 2911 → differential assembly 2910 → front wheels of the vehicle.

[0086] The third drive power transmission route of the vehicle is as follows:

[0087] The second motor 240 → the second motor shaft 241 → the two-speed planetary mechanism 250 → the second shaft 260 → the drive axle 300 → the rear wheel of the vehicle.

[0088] The power transmission route for the vehicle's generator:

[0089] The engine 100 → the first shaft 201 → the planetary gear assembly 230 → the first motor shaft 221 → the first motor 220.

[0090] (5) Second hybrid four-wheel drive mode

[0091] In the second hybrid four-wheel drive mode, the engine 100 is in a driving state, the first motor 220 is in a driving state as it rotates, the second motor 240 actively controls the speed and generates electricity, and the first clutch assembly 210 is in an engaged state.

[0092] In this mode, the planetary gear assembly 230 has inter-axle differential and gear matching functions, and its specific principle is the same as that of the first hybrid four-wheel drive mode described above. Furthermore, in this mode, to adjust the torque distribution between the front and rear wheels, when the vehicle is in a rear-wheel slippage condition, the second motor 240 generates electricity to reduce the output torque of the rear wheels. The electrical energy generated by the second motor 240 is directly supplied to the first motor 220 for driving, and the power output by the first motor 220 is supplied to the front wheels of the vehicle to increase the driving torque of the front wheels.

[0093] In this mode, there are three drive power transmission routes and one power generation transmission route, namely:

[0094] The first driving power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → second motor shaft 241 → second motor 240 → second motor shaft 241 → two-speed planetary mechanism 250 → second shaft 260 → drive axle 300 → rear wheel of the vehicle.

[0095] The second drive power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → first motor shaft 221 → first gear 222 → second gear 271 → fourth shaft 270 → third gear 272 (or fourth gear 273) → fifth gear 281 (or sixth gear 282) → second clutch driving end 291 (or third clutch driving end 292) → second clutch driven end 293 → fifth shaft 280 → seventh gear 283 → eighth gear 2911 → differential assembly 2910 → front wheel of the vehicle.

[0096] The third drive power transmission route of the vehicle is as follows: first motor 220 → first motor shaft 221 → first gear 222 → second gear 271 → fourth shaft 270 → third gear 272 (or fourth gear 273) → fifth gear 281 (or sixth gear 282) → second clutch driving end 291 (or third clutch driving end 292) → second clutch driven end 293 → fifth shaft 280 → seventh gear 283 → eighth gear 2911 → differential assembly 2910 → front wheel of the vehicle.

[0097] Vehicle power generation transmission route 1: Engine 100 → First shaft 201 → Planetary gear assembly 230 → Second motor shaft 241 → Second motor 240.

[0098] (6) Hybrid rear-wheel drive mode

[0099] In the hybrid rear-wheel drive mode, the engine 100 is in a driving state, the first motor 220 adjusts the engine speed and generates electricity, the second motor 240 is in a driving state, the first clutch assembly 210 is in an engaged state, and the second clutch assembly 290 is in an disengaged state.

[0100] In this mode, the planetary gear assembly 230 has a power coupling function, which is responsible for regulating the speed and torque of the engine 100, the first motor 220 and the second motor 240.

[0101] In this mode, there are two drive power transmission routes and one power generation transmission route, which are:

[0102] The primary drive power transmission route of the vehicle is as follows:

[0103] In low gear: Engine 100 → First shaft 201 → Planetary gear assembly 230 → Second motor shaft 241 → Second motor 240 → Second motor shaft 241 → Two-speed planetary mechanism 250 (at this time, the brake 254 in the two-speed planetary mechanism 250 is working to brake the second gear ring 253, and the clutch 255 is in the disengaged state) → Third shaft 260 → Drive axle 300 → Rear wheel of the vehicle.

[0104] In high gear: Engine 100 → First shaft 201 → Planetary gear assembly 230 → Second motor shaft 241 → Second motor 240 → Second motor shaft 241 → Two-speed planetary mechanism 250 (at this time, the brake 254 in the two-speed planetary mechanism 250 is in the disengaged state, and the clutch 255 is in the engaged state to connect the second ring gear 253 to the planet carrier 252) → Third shaft 260 → Drive axle 300 → Rear wheel of the vehicle.

[0105] The second drive power transmission route of the vehicle is as follows:

[0106] In low speed gear: Second motor 240 → Second motor shaft 241 → Second motor 240 → Second motor shaft 241 → The two-speed planetary mechanism 250 (at this time, the brake 254 in the two-speed planetary mechanism 250 works to brake the second gear ring 253, and the clutch 255 is in the disengaged state) → Third shaft 260 → Drive axle 300 → Rear wheel of the vehicle.

[0107] In high gear: Second motor 240 → Second motor shaft 241 → Second motor 240 → Second motor shaft 241 → Two-speed planetary mechanism 250 (at this time, the brake 254 in the two-speed planetary mechanism 250 is in the disengaged state, and the clutch 255 is in the engaged state to connect the second gear ring 253 to the planet carrier 252) → Third shaft 260 → Drive axle 300 → Rear wheel of the vehicle.

[0108] The power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → first motor shaft 221 → first motor 220.

[0109] (7) Hybrid front-wheel drive mode

[0110] In the hybrid front-wheel drive mode, the engine 100 is in drive mode, the second motor 240 adjusts the speed of the engine 100 and generates electricity, the first motor 220 is in drive mode, the first clutch assembly 210 is in engagement mode, and the two-speed planetary mechanism 250 is in neutral (at this time, the brake 254 and the clutch 255 of the two-speed planetary mechanism 250 are both in disengagement mode).

[0111] In this mode, the planetary gear assembly 230 has a power coupling function, which is responsible for regulating the speed and torque of the engine 100, the first motor 220 and the second motor 240.

[0112] In this mode, there are two drive power transmission routes and one power generation transmission route, which are:

[0113] The primary drive power transmission route of the vehicle is as follows:

[0114] In low gear: Engine 100 → First shaft 201 → Planetary gear assembly 230 → First motor shaft 221 → First gear 222 → Second gear 271 → Fourth shaft 270 → Third gear 272 → Fifth gear 281 → Second clutch driving end 291 → Second clutch driven end 293 → Fifth shaft 280 → Seventh gear 283 → Eighth gear 2911 → Differential assembly 2910 → Front wheels of the vehicle.

[0115] In high gear: Engine 100 → First shaft 201 → Planetary gear assembly 230 → First motor shaft 221 → First gear 222 → Second gear 271 → Fourth shaft 270 → Fourth gear 273 → Sixth gear 282 → Third clutch driving end 292 → Second clutch driven end 293 → Fifth shaft 280 → Seventh gear 283 → Eighth gear 2911 → Differential assembly 2910 → Front wheels of the vehicle.

[0116] The second drive power transmission route of the vehicle is as follows:

[0117] In low speed gear: First motor 220 → First motor shaft 221 → First gear 222 → Second gear 271 → Fourth shaft 270 → Third gear 272 → Fifth gear 281 → Second clutch driving end 291 → Second clutch driven end 293 → Fifth shaft 280 → Seventh gear 283 → Eighth gear 2911 → Differential assembly 2910 → Front wheel of the vehicle.

[0118] In high speed gear: First motor 220 → First motor shaft 221 → First gear 222 → Second gear 271 → Fourth shaft 270 → Fourth gear 273 → Sixth gear 282 → Third clutch driving end 292 → Second clutch driven end 293 → Fifth shaft 280 → Seventh gear 283 → Eighth gear 2911 → Differential assembly 2910 → Front wheel of the vehicle.

[0119] The power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → second motor shaft 241 → second motor 240.

[0120] (8) Engine four-wheel drive mode:

[0121] In the four-wheel drive mode, the engine 100 is in a driving state, the first motor 220 and the second motor 240 rotate but are not in a driving state, and the first clutch assembly 210 is in an engaged state.

[0122] In this mode, the planetary gear assembly 230 has inter-axle differential and gear matching functions, and the specific principle is the same as that of the first hybrid four-wheel drive mode.

[0123] In this mode, there are two drive power transmission routes:

[0124] The first driving power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → second motor shaft 241 → second motor 240 → second motor shaft 241 → two-speed planetary mechanism 250 → second shaft 260 → drive axle 300 → rear wheel of the vehicle.

[0125] The second drive power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → first motor shaft 221 → first gear 222 → second gear 271 → fourth shaft 270 → third gear 272 (or fourth gear 273) → fifth gear 281 (or sixth gear 282) → second clutch driving end 291 (or third clutch driving end 292) → second clutch driven end 293 → fifth shaft 280 → seventh gear 283 → eighth gear 2911 → differential assembly 2910 → front wheels of the vehicle.

[0126] (9) Engine four-wheel drive + generator mode:

[0127] In the four-wheel drive + generator mode, the engine 100 is in a driving state, the first motor 220 and the second motor 240 rotate and are in a generator state, and the first clutch assembly 210 is in an engaged state.

[0128] In this mode, the planetary gear assembly 230 has inter-axle differential and gear matching functions, and the specific principle is the same as that of the first hybrid four-wheel drive mode. In this mode, in order to improve the working efficiency of the engine 100, the engine 100 operates in a high-load mode. The part of the power provided by the engine 100 that is greater than the power required by the vehicle is converted into electrical energy and stored in the battery by the first motor 220 and the second motor 240. When the battery is fully charged, the engine four-wheel drive + generator mode is exited, and the mode reverts to engine four-wheel drive mode.

[0129] In this mode, there are two drive power transmission routes and two power generation transmission routes, namely:

[0130] The first driving power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → second motor shaft 241 → second motor 240 → second motor shaft 241 → two-speed planetary mechanism 250 → second shaft 260 → drive axle 300 → rear wheel of the vehicle.

[0131] The second drive power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → first motor shaft 221 → first gear 222 → second gear 271 → fourth shaft 270 → third gear 272 (or fourth 273) → fifth gear 281 (or sixth 282) → second clutch driving end 291 (or third clutch driving end 292) → second clutch driven end 293 → fifth shaft 280 → seventh gear 283 → eighth gear 2911 → differential assembly 2910 → front wheel of the vehicle.

[0132] The first power transmission route of the vehicle is: engine 100 → first shaft 201 → planetary gear assembly 230 → first motor shaft 221 → first motor 220.

[0133] The second power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → second motor shaft 241 → second motor 240.

[0134] (10) Parallel four-wheel drive mode:

[0135] In the parallel four-wheel drive mode, the engine 100 is in a driving state, the first motor 220 and the second motor 240 are in a driving state as they rotate, and the first clutch assembly 210 is in an engaged state.

[0136] In this mode, the planetary gear assembly 230 has inter-axle differential and gear matching functions, and its specific principle is the same as that of the first hybrid four-wheel drive mode. In this mode, in order to improve the acceleration performance of the vehicle, the maximum acceleration capability is achieved by the joint drive of the engine 100, the first motor 220 and the second motor 240. If the vehicle's acceleration performance remains unchanged, the hybrid system 200 using this mode can select a lower-power engine and motor to reduce costs.

[0137] This mode has four drive power transmission routes, namely:

[0138] The first driving power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → second motor shaft 241 → second motor 240 → second motor shaft 241 → two-speed planetary mechanism 250 → second shaft 260 → drive axle 300 → rear wheel of the vehicle.

[0139] The second drive power transmission route of the vehicle is as follows: engine 100 → first shaft 201 → planetary gear assembly 230 → first motor shaft 221 → first gear 222 → second gear 271 → fourth shaft 270 → third gear 272 (or fourth gear 273) → fifth gear 281 (or sixth gear 282) → second clutch driving end 291 (or third clutch driving end 292) → second clutch driven end 293 → fifth shaft 280 → seventh gear 283 → eighth gear 2911 → differential assembly 2910 → front wheel of the vehicle.

[0140] The third drive power transmission route of the vehicle is as follows: the second motor 240 → the second motor shaft 241 → the two-speed planetary mechanism 250 → the second shaft 260 → the drive axle 300 → the rear wheel of the vehicle.

[0141] The fourth drive power transmission route of the vehicle is as follows: first motor 220 → first motor shaft 221 → first gear 222 → second gear 271 → fourth shaft 270 → third gear 272 (or fourth gear 273) → fifth gear 281 (or sixth gear 282) → second clutch driving end 291 (or third clutch driving end 292) → second clutch driven end 293 → fifth shaft 280 → seventh gear 283 → eighth gear 2911 → differential assembly 2910 → front wheel of the vehicle.

[0142] Furthermore, by adjusting the states of the components in the two-speed planetary mechanism 250 and the second clutch assembly 290, four gears can be achieved in both hybrid four-wheel drive mode and engine four-wheel drive mode, as detailed below:

[0143] 4-speed gear control for hybrid four-wheel drive mode and engine four-wheel drive mode:

[0144]

[0145] Furthermore, based on the structure of the hybrid system 200 described above in the embodiments of this disclosure and the drive power transmission route of the vehicle having the hybrid system 200, the embodiments of this disclosure enable the vehicle equipped with the hybrid system 200 to achieve inter-axle differential locking function without an inter-axle differential lock mechanical structure. The inter-axle differential locking function here is achieved through the planetary gear assembly 230.

[0146] Specifically, when the vehicle is in four-wheel drive mode, the power from the engine 100 is input to the planet carrier 232 in the planetary gear assembly 230, and then a portion of the power is transmitted to the front wheels of the vehicle through the sun gear 231, while a portion of the power is transmitted to the rear wheels of the vehicle through the first ring gear 233. Here, since the planetary gear assembly 230 has three degrees of freedom, when the speeds of the front and rear wheels of the vehicle are different, the planetary gear assembly 230 can automatically adjust the rotational speeds of the sun gear 231 and the first ring gear 233 to achieve differential speed between the front and rear gears, i.e., to realize the inter-axle differential speed function.

[0147] The planetary gear assembly 230 described here has multiple functions. In hybrid rear-wheel drive mode and hybrid front-wheel drive mode, the planetary gear assembly 230 can act as a power coupler; in hybrid four-wheel drive mode, engine four-wheel drive mode and parallel four-wheel drive mode, the planetary gear assembly 230 can act as an inter-axle differential and gear matching function. The same structure has multiple different uses, which simplifies the complex structure, reduces the number of parts, and saves space and cost.

[0148] A second embodiment of this disclosure provides a vehicle that employs the hybrid system described in any of the above embodiments.

[0149] The third embodiment of this disclosure provides a vehicle control method, which adopts the structure of the hybrid system 200 in the first embodiment. When the vehicle is in four-wheel drive mode, if the front wheels of the vehicle slip due to lack of traction, the rear wheels of the vehicle will also lose power under the action of the inter-axle differential provided by the planetary gear assembly 230. Alternatively, if the rear wheels of the vehicle slip due to lack of traction, the front wheels of the vehicle will also lose power under the action of the inter-axle differential. In this case, the vehicle will be unable to drive or get out of trouble.

[0150] Since the sun gear 231 in the planetary gear assembly 230 is rigidly connected to the first motor 220 via the first motor shaft 221, and the ring gear 240 is rigidly connected to the second motor 241 via the second motor shaft 241, when the vehicle is in four-wheel drive mode and the front wheels gradually slip due to lack of traction or low traction, the vehicle's control system can execute the following control method:

[0151] S101, determine whether the front wheel is about to slip; if the front wheel is about to slip, control the first motor to enter the power generation state.

[0152] S102, when the torque output by the vehicle is greater than or equal to the torque requirement value, store the generated electrical energy of the first motor;

[0153] S103, when the torque output by the vehicle is less than the torque requirement and the torque obtained by the rear wheel is less than the slip limit torque of the rear wheel, the generated electrical energy is transmitted to the second motor to drive the rear wheel.

[0154] Specifically, (1) for example, the relationship between vehicle speed and wheel speed can be used to determine whether the front wheels of the vehicle are about to slip. When the front wheels of the vehicle are about to slip, the vehicle control system sends a power generation command to the control unit of the first motor 220, so that the first motor 220 enters the power generation state. The power generation torque of the first motor 220 plus the remaining load torque of the front wheels is equal to the torque that the engine distributes to the front wheels. In this way, the front wheels will not slip under low load, and the rear wheels of the vehicle will also receive the corresponding driving torque, so that the vehicle can drive normally.

[0155] (2) If the torque output by the vehicle is sufficient at this time (e.g., greater than or equal to the torque requirement), the electrical energy generated by the first motor 220 is directly stored in the vehicle's battery; if the torque output by the vehicle is insufficient at this time (e.g., less than the torque requirement), and the torque obtained by the rear wheels of the vehicle does not reach the slip limit torque of the rear wheels of the vehicle, the electrical energy generated by the first motor 220 is directly provided to the second motor 240, so that the second motor 240 enters the driving state, thereby increasing the driving force of the rear wheels of the vehicle to help the vehicle get out of trouble or accelerate.

[0156] Furthermore, when the vehicle is in four-wheel drive mode, and the rear wheels gradually slip due to lack of traction or low traction, the vehicle's control system can execute the following control methods:

[0157] S201, determine whether the rear wheel is about to slip; if the rear wheel is about to slip, control the second motor to enter the power generation state.

[0158] S202, when the torque output by the vehicle is greater than or equal to the torque requirement value, the electrical energy generated by the second motor is stored;

[0159] S203, when the torque output by the vehicle is less than the torque requirement and the torque obtained by the front wheel is less than the slip limit torque of the front wheel, the generated electrical energy is transmitted to the first motor to drive the front wheel.

[0160] Specifically, (1) when the rear wheels of the vehicle gradually slip due to lack of adhesion or low adhesion, the vehicle control system calculates the relationship between vehicle speed and wheel speed and determines that the rear wheels of the vehicle are about to enter a slipping state. At this time, the vehicle control system sends a power generation command to the control unit of the second motor 240 to make the second motor 240 enter the power generation state. The power generation torque of the second motor 240 plus the remaining load torque of the front wheels is equal to the torque that the engine distributes to the rear wheels. In this way, the rear wheels will not slip under low load, and the front wheels of the vehicle will also receive the corresponding driving torque, so that the vehicle can drive normally.

[0161] (2) If the torque output by the vehicle is sufficient (e.g., greater than or equal to the torque requirement), the electrical energy generated by the second motor 240 is directly stored in the vehicle's battery. If the torque output by the vehicle is insufficient (e.g., less than the torque requirement), and the torque obtained by the front wheels of the vehicle does not reach the slip limit torque of the front wheels, the electrical energy generated by the second motor 240 is directly supplied to the first motor 220, allowing the first motor 220 to enter the driving state, thereby increasing the driving force of the front wheels of the vehicle to help the vehicle get out of trouble or accelerate, and finally enabling the vehicle to achieve the effect of inter-axle differential locking.

[0162] The embodiments disclosed herein can satisfy the overall vehicle layout space requirements, as well as the four-wheel drive and energy-saving requirements of the longitudinally mounted hybrid system. At the same time, the structure is compact, small in size, and light in weight, reducing the cost burden of applying the hybrid system. In addition, the inter-axle differential locking function can be realized without the mechanical structure of the inter-axle differential lock, improving the vehicle's off-road passability. Furthermore, the elimination of the mechanical locking structure reduces costs and results in a compact structure.

[0163] The fourth embodiment of this disclosure provides a vehicle control method that adopts the structure of the hybrid system 200 in the first embodiment described above. The third embodiment of this disclosure enables the vehicle with the hybrid system 200 to achieve a super acceleration mode, so that the vehicle can always work in the maximum boundary acceleration state to achieve the theoretical fastest mode.

[0164] When the vehicle is in engine four-wheel drive mode, the torque distribution between the front and rear wheels is determined by the structural dimensions of the planetary gear assembly 230. It can only be distributed in a fixed ratio and cannot be intelligently adjusted. Because the vehicle experiences axle load transfer during acceleration, the axle load on the front wheels generally decreases while the axle load on the rear wheels increases. This results in a decrease in the maximum traction the front wheels can withstand and an increase in the maximum traction the rear wheels can withstand. However, since the torque distribution between the front and rear wheels is fixed, the initial design of the torque distribution often results in a slightly lower torque allocated to the front wheels and a slightly higher torque allocated to the rear wheels. For example, the torque distribution ratio might be 40:60. Therefore, during acceleration control, to avoid wasting engine power, the engine's output torque might be controlled based on which wheel slips first, thus failing to utilize the vehicle's theoretical maximum acceleration performance.

[0165] Therefore, the control method of this disclosure includes the following steps:

[0166] S301, when the vehicle speed is less than a preset threshold and the acceleration is greater than a preset threshold, when the obtained torque of the front wheel is greater than or equal to the slip limit torque of the front wheel, the difference between the obtained torque of the rear wheel and the slip limit torque of the rear wheel is obtained.

[0167] S302, when the battery charge of the vehicle is greater than or equal to a preset threshold, the second motor is controlled to drive the rear wheels based on the difference.

[0168] S303, when the battery charge of the vehicle is less than a preset threshold, the output torque of the engine is increased, and the torque portion obtained by the first motor that exceeds the slip limit torque of the front wheel is converted into electrical energy and transmitted to the second motor to drive the second motor.

[0169] In this embodiment of the disclosure, during the acceleration process of the vehicle at low speed and high acceleration (i.e., the vehicle speed is less than a preset threshold and the acceleration is greater than a preset threshold), if the torque obtained by the front wheels of the vehicle is just equal to or greater than the slip limit torque of the front wheels, the torque obtained by the rear wheels of the vehicle may be less than the slip limit torque of the rear wheels. At this time, the vehicle control system determines that the rear wheels of the vehicle can withstand a greater driving torque (i.e., slip limit torque) based on the vehicle's speed and acceleration. The vehicle control system calculates the difference between the driving force currently obtained by the rear wheels and the maximum torque that can be withstood (i.e., slip limit torque).

[0170] If the vehicle's battery has sufficient charge for this acceleration, the vehicle's control system issues a drive command to the control unit of the second motor 240. The control system of the second motor 240 then controls the second motor 240 to output the differential torque calculated by the vehicle's control system to the rear wheels of the vehicle, so that the rear wheels of the vehicle can reach the maximum torque limit.

[0171] If the vehicle's battery charge is insufficient to support the acceleration, the vehicle's control system, based on the theoretical maximum torque and power output during acceleration (i.e., the theoretical maximum slippage torque of the front and rear wheels), controls the engine to output greater torque and power. This results in the front wheels receiving more torque than their maximum slippage limit, leading to front wheel slippage and wasted power. Conversely, the rear wheels receive less torque than their maximum slippage limit, resulting in insufficient power. In this case, the vehicle's control system calculates the excess torque of the front wheels and the insufficient torque of the rear wheels. The power torque sends a speed-sensitive power generation command to the control unit of the first motor 220. The control unit of the first motor 220 controls the first motor 220 to generate electricity, converting the excess torque of the front wheels into electrical energy, which is then used to drive the second motor 240. The vehicle's control system sends a drive command to the control system of the second motor 240, which in turn controls the output torque of the second motor 240 to drive the rear wheels, so that the output torque of the rear wheels reaches the maximum bearing limit torque (i.e., the slippage limit torque), thereby achieving the vehicle's extreme acceleration control at low speeds and high acceleration.

[0172] Also includes:

[0173] S301, when the vehicle speed is greater than or equal to a preset threshold and the acceleration is less than a preset threshold, when the vehicle battery charge is greater than or equal to a preset threshold, the output torque of the engine is reduced so that the torque obtained by the rear wheel is equal to the slip limit torque of the rear wheel.

[0174] S302, obtain the difference between the obtained torque of the front wheel and the slip limit torque of the front wheel, and control the first motor to drive the front wheel based on the difference.

[0175] S303, when the vehicle battery charge is less than a preset threshold, the second motor is controlled to enter the power generation state, and the torque portion obtained by the second motor that exceeds the slip limit torque of the rear wheel is converted into electrical energy and transmitted to the first motor to drive the first motor.

[0176] In this embodiment of the disclosure, when the vehicle is at high speed and the acceleration decreases (that is, the vehicle speed is greater than or equal to a preset threshold and the acceleration is less than a preset threshold), the axle load transfer of the vehicle decreases. As a result, the load on the front wheels increases appropriately and the load on the rear wheels decreases appropriately. As a result, the torque obtained by the front wheels is less than its maximum bearing torque (that is, the slip limit torque), resulting in insufficient power. Meanwhile, the torque obtained by the rear wheels is greater than its maximum bearing torque (that is, the slip limit torque), resulting in excess power.

[0177] At this time, the vehicle's control system intelligently judges the battery's charge level. When the battery is fully charged, the vehicle's control system controls the engine 100 to reduce the driving force and power output, so that the torque obtained by the rear wheels of the vehicle is equal to the maximum driving force it can withstand (i.e., the slip limit torque). The vehicle's control system calculates the difference between the driving force obtained by the front wheels and the maximum torque it can withstand (i.e., the slip limit torque), and sends a driving command to the control system of the first motor 220. The control unit of the first motor 220 controls the first motor 220 to output driving force to provide drive to the front wheels, so that the output torque of the front wheels reaches the maximum torque it can withstand (i.e., the slip limit torque).

[0178] If the vehicle's battery is low at this time, the vehicle's control system sends a speed-sensitive power generation command to the control system of the second motor 240. The control unit of the second motor 240 controls the second motor 240 to generate electricity, converting the excess power of the rear wheels into electrical energy, which is then used to power the first motor 220. The vehicle's control system sends a drive command to the control unit of the first motor 220, which then controls the first motor 220 to output drive force to the front wheels, enabling the front wheels to reach their maximum torque limit (i.e., slippage limit torque). This achieves extreme acceleration control of the vehicle at high speeds with low acceleration, ultimately allowing the vehicle to achieve its theoretical maximum acceleration across the entire speed range.

[0179] The embodiments disclosed herein enable the vehicle to always operate at its maximum boundary acceleration state to achieve the theoretical fastest mode, providing intelligent dynamic drive control technology for acceleration and realizing intelligent driving of the vehicle.

[0180] The fifth embodiment of this disclosure relates to a vehicle control device, which includes multiple modules coupled to each other, wherein each module is used to implement the function of each step in the fourth and fifth embodiments described above.

[0181] The sixth embodiment of this disclosure provides a storage medium, which is a computer-readable medium, storing a computer program that, when executed by a processor, implements the method provided in the first embodiment of this disclosure.

[0182] The seventh embodiment of this disclosure provides an electronic device that includes at least a storage device and a processor. The storage device stores a computer program, and the processor implements the method provided in any embodiment of this disclosure when executing the computer program stored in the storage device.

[0183] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features disclosed in this disclosure that have similar functions.

[0184] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

[0185] The foregoing has provided a detailed description of several embodiments of this disclosure. However, this disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications based on the concept of this disclosure, and all such variations and modifications should fall within the scope of protection claimed by this disclosure.

Claims

1. A hybrid system for a vehicle, used to drive the front and rear wheels of the vehicle separately in multiple operating modes, characterized in that, The system includes a first shaft, a first clutch assembly, a second shaft, a first motor, a planetary gear set assembly, a second motor, and a two-speed planetary gear mechanism, all connected sequentially between the engine and the transfer case. The first shaft is connected to the second shaft via the first clutch assembly. The first motor and the planetary gear set assembly are mounted on the second shaft. The second shaft is connected to the second motor via the planetary gear set assembly. The two-speed planetary gear mechanism is connected to the transfer case via a third shaft. The planetary gear set assembly is also connected to a differential assembly via the second clutch assembly. The transfer case is connected to the rear wheels, and the differential assembly is connected to the front wheels. The planetary gear assembly includes a first sun gear, a first planet carrier, and a first ring gear. The first motor shaft of the first motor is fixedly connected to the first sun gear in the planetary gear assembly. The second shaft is fixedly connected to the first planet carrier. The first shaft and the first motor shaft are nested together. A first gear is provided on the first motor shaft. The first gear is connected to the differential assembly through the second clutch assembly. The first end of the second motor shaft of the second motor is fixedly connected to the first ring gear in the planetary gear assembly. The second end of the second motor shaft of the second motor is connected to the two-speed planetary mechanism.

2. The hybrid system according to claim 1, characterized in that, The two-speed planetary mechanism includes a second sun gear, a second planet carrier, a second ring gear, a brake, and a clutch. The driving end of the clutch is fixedly connected to the second ring gear, and the driven end of the clutch is fixedly connected to the second planet carrier.

3. The hybrid system according to claim 1, characterized in that, The first clutch assembly includes a first clutch driving end and a first clutch driven end. The first shaft is fixedly connected to the first clutch driving end of the first clutch assembly. The first end of the second shaft is connected to the first clutch driven end of the first clutch assembly, and its second end is fixedly connected to the first sun gear in the planetary gear assembly.

4. The hybrid system according to claim 2, characterized in that, The second end of the second motor shaft is fixedly connected to the second sun gear in the two-speed planetary mechanism, and the second planet carrier in the two-speed planetary mechanism is fixedly connected to the third shaft.

5. The hybrid system according to claim 4, characterized in that, The hybrid system also includes a fourth shaft and a fifth shaft. A second gear, a third gear, and a fourth gear are fixedly mounted on the fourth shaft. The second clutch assembly is mounted on the fifth shaft. A fifth gear, a sixth gear, and a seventh gear are mounted on the fifth shaft. An eighth gear is fixedly mounted on the input shaft of the differential assembly.

6. The hybrid system according to claim 5, characterized in that, The second clutch assembly includes a second clutch driving end, a third clutch driving end, and a second clutch driven end. The two ends of the fifth shaft are fixedly connected to the seventh gear and the second clutch driven end, respectively. The fifth gear is fixedly connected to the second clutch driving end, and the sixth gear is fixedly connected to the third clutch driving end. The fifth gear, the sixth gear, the second clutch driving end, and the third clutch driving end are loosely fitted on the fifth shaft. The first gear meshes with the second gear, the third gear meshes with the fifth gear, the fourth gear meshes with the sixth gear, and the seventh gear meshes with the eighth gear.

7. The hybrid system according to claim 6, characterized in that, The first shaft is arranged parallel to the rotation axis of the first clutch assembly, the second shaft, the rotation axis of the first motor, the rotation axis of the planetary gear assembly, the rotation axis of the second motor, the rotation axis of the two-speed planetary mechanism, the third shaft, the fourth shaft, the fifth shaft, and the rotation axis of the second clutch assembly. The first shaft is arranged perpendicular to the rotation axis of the differential assembly and perpendicular to the rotation axes of the front and rear wheels.

8. A vehicle, characterized in that, The hybrid system included in any one of claims 1-7.

9. A method for controlling a vehicle, wherein the vehicle is the vehicle of claim 8, and the vehicle operates in four-wheel drive mode, characterized in that, The control method includes: Determine whether the front wheel is about to slip; if the front wheel is about to slip, control the first motor to enter the power generation state. When the torque output by the vehicle is greater than or equal to the torque requirement, the electrical energy generated by the first motor is stored. When the torque output by the vehicle is less than the torque requirement and the torque received by the rear wheels is less than the slip limit torque of the rear wheels, the generated electrical energy is transmitted to the second motor to drive the rear wheels; and / or Determine whether the rear wheel is about to slip; if the rear wheel is about to slip, control the second motor to enter the power generation state. When the torque output by the vehicle is greater than or equal to the torque requirement, the electrical energy generated by the second motor is stored. When the torque output by the vehicle is less than the torque requirement and the torque obtained by the front wheel is less than the slip limit torque of the front wheel, the generated electrical energy is transmitted to the first motor to drive the front wheel.

10. A method for controlling a vehicle, wherein the vehicle is the vehicle of claim 8, and the vehicle operates in four-wheel drive mode, characterized in that, The control method includes: When the vehicle speed is less than a preset threshold and the acceleration is greater than a preset threshold, when the obtained torque of the front wheel is greater than or equal to the slip limit torque of the front wheel, the difference between the obtained torque of the rear wheel and the slip limit torque of the rear wheel is obtained. When the vehicle's battery charge is greater than or equal to a preset threshold, the second motor is controlled to drive the rear wheels based on the difference. When the vehicle's battery charge is below a preset threshold, the engine's output torque is increased, and the portion of the torque obtained by the first motor exceeding the slippage limit torque of the front wheels is converted into electrical energy and transmitted to the second motor to drive the second motor; and / or When the vehicle speed is greater than or equal to a preset threshold and the acceleration is less than a preset threshold, and when the vehicle battery charge is greater than or equal to a preset threshold, the output torque of the engine is reduced so that the torque obtained by the rear wheel is equal to the slip limit torque of the rear wheel. The difference between the obtained torque of the front wheel and the slip limit torque of the front wheel is obtained, and the first motor is controlled to drive the front wheel based on the difference; When the vehicle battery charge is less than a preset threshold, the second motor is controlled to enter the power generation state, and the torque portion obtained by the second motor that exceeds the slip limit torque of the rear wheel is converted into electrical energy and transmitted to the first motor to drive the first motor.

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