Double-gear hybrid power system and vehicle with double-gear hybrid power system

Abstract

The invention relates to the technical field of vehicles, in particular to a double-gear hybrid power system and a vehicle with the double-gear hybrid power system. The internal combustion engine or / and the first motor is / are connected with the front wheels or / and the rear wheels through a transmission unit. The transmission unit comprises a first transmission unit and a second transmission unit; the first transmission unit is connected with the second transmission unit through the clutch unit; the internal combustion engine is connected with the front wheel through the first transmission unit; the first motor is connected with the rear wheel through the second transmission unit; through cooperative use of the internal combustion engine, the first motor and the transmission unit, multi-mode driving of the power system can be achieved; the hybrid power architecture of a multi-gear series-parallel hybrid power and power dividing function mode is realized, the advantages of high power dividing energy utilization rate, driving comfort in a pure electric mode, high dynamic property in a parallel mode and the like can be combined, and multiple driving modes are provided to meet the requirements of road conditions and driving experience.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, specifically to a dual-speed hybrid system and a vehicle having the dual-speed hybrid system. Background Technology

[0002] With increasing global awareness of environmental protection and China's commitment to energy conservation and emission reduction targets, the development of new energy vehicles has become an important part of national policy.

[0003] Hybrid vehicles are the mainstay of new energy vehicles. The promotion and use of hybrid vehicles will help reduce dependence on fossil fuels, reduce greenhouse gas emissions, improve urban air quality, and thus achieve sustainable development goals.

[0004] Hybrid technology is a vehicle powertrain technology that combines a traditional internal combustion engine power system with an electric motor drive system. Its core concept is to improve vehicle power performance and optimize fuel efficiency through the coordinated work of the internal combustion engine and the electric motor, while reducing emissions and achieving the goals of energy conservation and environmental protection.

[0005] Currently, the mainstream hybrid architectures for new energy vehicles include range-extended, parallel, series-parallel, and power-split hybrids.

[0006] Existing hybrid technologies, such as programmable, parallel, and series-parallel hybrids, mostly adopt single-speed or three-speed structures. Single-speed structures and control strategies are simple, but the speed ratio is fixed, making it impossible to achieve the effect of gear shifting, resulting in weak power. Three-speed structures have overly complex control strategies, a higher failure rate, and higher maintenance costs.

[0007] The existing patent CN118636650A, "Longitudinal Multi-Speed ​​Dual-Motor Hybrid System and Hybrid Drive Method," does not explicitly disclose the technical content that solves the aforementioned technical problems.

[0008] Therefore, in order to improve or solve at least one of the above technical problems, it is necessary to optimize the design of the existing hybrid system. Summary of the Invention

[0009] The purpose of this invention is to provide a hybrid system capable of multi-mode driving.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A two-speed hybrid system includes an internal combustion engine and a first electric motor;

[0012] The internal combustion engine and / or the first electric motor are connected to the front wheel and / or the rear wheel via a transmission unit;

[0013] The internal combustion engine and / or the first electric motor can both drive the front wheels and / or the rear wheels.

[0014] The transmission unit includes a first transmission unit and a second transmission unit; the first transmission unit is connected to the second transmission unit via a clutch unit;

[0015] The internal combustion engine is connected to the front wheel via a first transmission unit;

[0016] The first motor is connected to the rear wheel via the second transmission unit.

[0017] The first transmission unit includes a first input shaft and a first output shaft; the first input shaft is connected to the first output shaft via a first gear unit;

[0018] The second transmission unit includes a second input shaft and a second output shaft; the second input shaft is connected to the second output shaft through a second gear unit.

[0019] The first gear unit includes an input gear disposed on a first input shaft and an output gear disposed on a first output shaft; the input gear meshes with the output gear; the input gear is connected to the first input shaft through a first power selection unit.

[0020] The input gear is rotatably connected to the first input shaft, and the first power selection unit includes a first synchronizer disposed on the first input shaft, which can be connected to the input gear.

[0021] The second gear unit includes a first-stage gear unit and a second-stage gear unit; a second power selection unit is provided between the first-stage gear unit and the second-stage gear unit;

[0022] The primary gear unit includes a second type of input gear disposed on the second input shaft and a second type of output gear disposed on the second output shaft;

[0023] The secondary gear unit includes three types of input gears mounted on the second input shaft and three types of output gears mounted on the second output shaft;

[0024] The second type of input gear and the third type of input gear are rotatably connected to the second input shaft;

[0025] The second power selection unit includes a second synchronizer disposed on the second input shaft; the second synchronizer can be connected to a type II input gear or a type III input gear.

[0026] The clutch unit includes a clutch; the clutch is used for power transmission or disconnection between the first transmission unit and the second transmission unit.

[0027] The internal combustion engine is connected to the first input shaft via a planetary gear structure.

[0028] The planetary gear structure is connected to a second motor.

[0029] A vehicle including the dual-speed hybrid system.

[0030] The dual-speed hybrid system can achieve multiple driving modes:

[0031] These are: front-wheel drive mode, rear-wheel drive mode, and four-wheel drive mode;

[0032] When using it: First, determine the driving mode of the dual-speed hybrid system; then, control the vehicle's operation according to the specific driving mode.

[0033] The advantages of this invention are:

[0034] This invention discloses a dual-speed hybrid system and a vehicle having the dual-speed hybrid system.

[0035] This invention enables multi-mode drive of the power system through the coordinated use of an internal combustion engine, a first electric motor, and a transmission unit; it realizes a hybrid architecture with multi-gear series-parallel hybrid and power split functions, which combines the advantages of high energy utilization of power split, driving comfort in pure electric mode, and strong power in parallel mode, providing multiple driving modes to meet the needs of road conditions and driving experience. Attached Figure Description

[0036] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0037] Figure 1 This is a schematic diagram of the structure of the present invention.

[0038] The markings in the above figures are all:

[0039] 1. Internal combustion engine; 2. First input shaft; 3. Second output shaft; 4. Second motor; 5. First motor; 6. Second input shaft; 7. First output shaft. Detailed Implementation

[0040] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0041] A dual-speed hybrid system includes an internal combustion engine 1 and a first electric motor 5; the internal combustion engine 1 and / or the first electric motor 5 are connected to the front wheels and / or the rear wheels via a transmission unit; both the internal combustion engine 1 and / or the first electric motor 5 can drive the front wheels and / or the rear wheels; the transmission unit includes a first transmission unit and a second transmission unit; the first transmission unit is connected to the second transmission unit via a clutch unit 14; the internal combustion engine 1 is connected to the front wheels via the first transmission unit; the first electric motor 5 is connected to the rear wheels via the second transmission unit; this invention, through the coordinated use of the internal combustion engine 1, the first electric motor 5, and the transmission unit, can realize multi-mode drive of the power system; it realizes a hybrid architecture with multi-speed series-parallel hybrid and power split functions, which can combine the advantages of high energy utilization of power split, driving comfort in pure electric mode, and strong power in parallel mode, providing multiple driving modes to meet the needs of road conditions and driving experience.

[0042] Specifically, the dual-speed hybrid system disclosed in this invention mainly includes an internal combustion engine 1 and a first electric motor 5; the internal combustion engine 1 can be a reciprocating piston engine or a rotary engine, and the crankshaft output end is fixedly connected to the planetary gear mechanism / first input shaft 2; it outputs mechanical work when needed, serving as the main energy source for the vehicle; it can also be towed and started; its main function is to provide power for continuous high-speed cruising and high-load conditions, ensuring long-distance driving range.

[0043] First motor 5 (EM1); permanent magnet synchronous motor or induction motor, rotor fixedly connected to second input shaft 6; integrated inverter and high voltage bus; pure electric drive for rear wheels, starting internal combustion engine 1, energy recovery for power generation, and parallel assist.

[0044] It achieves zero emissions from the start and two-speed pure electric rear-wheel drive.

[0045] In this invention, the internal combustion engine 1 and / or the first motor 5 are connected to the front wheel and / or the rear wheel via a transmission unit; the internal combustion engine 1 and / or the first motor 5 can drive the front wheel and / or the rear wheel; the transmission unit is mainly for the purpose of power transmission, so as to facilitate the front wheel, rear wheel or four-wheel drive of the vehicle.

[0046] There are many types of transmission units. Theoretically, any unit that can output power from the internal combustion engine 1 or / and the first motor 5 to drive the front or rear wheels is sufficient for use.

[0047] To simplify the structure of the dual-speed hybrid system and facilitate subsequent layout, the transmission unit in this invention includes a first transmission unit and a second transmission unit. The first transmission unit is connected to the second transmission unit via a clutch unit 14. The internal combustion engine 1 is connected to the front wheels via the first transmission unit. The first motor 5 is connected to the rear wheels via the second transmission unit. The transmission unit of this invention consists of an independent first transmission unit and a second transmission unit, and the first transmission unit and the second transmission unit are mechanically coupled in a disengageable manner via a clutch unit 14.

[0048] In this invention, the input end of the first transmission unit is connected to the internal combustion engine 1, which can be directly connected or connected using a planetary gear structure 9; the output end is connected to the front wheel differential; while in this invention, the input end of the second transmission unit is adjacent to the rotor of the first motor 5, and the output end is directly connected to the rear wheel differential.

[0049] The clutch unit 14 is arranged between the first transmission unit and the second transmission unit; specifically, it can be arranged between the first input shaft 2 of the first transmission unit and the second output shaft 3 of the second transmission unit; in practice, engagement / disengagement can be achieved through an electro-hydraulic actuator.

[0050] Based on the above design, the two power paths of the dual-speed hybrid system can be completely decoupled in this invention, reducing the number of parts.

[0051] In this invention, the first transmission unit and the second transmission unit can be staggered along the longitudinal direction of the vehicle or stacked vertically, requiring only axial space to be reserved for the clutch unit 14, which facilitates the arrangement of the battery pack in the front compartment and rear floor.

[0052] The system can switch between front-wheel drive, rear-wheel drive, and four-wheel drive modes by engaging / disengaging a single clutch unit 14. The control logic is simple and there are few points of failure.

[0053] Furthermore, in this invention, the first transmission unit includes a first input shaft 2 and a first output shaft 7; the first input shaft 2 is connected to the first output shaft 7 via a first gear unit 13; the second transmission unit includes a second input shaft 6 and a second output shaft 3; the second input shaft 6 is connected to the second output shaft 3 via a second gear unit; in this invention, the first input shaft 2 is connected to the first output shaft 7 via the first gear unit 13, thereby realizing the transmission of power from the first input shaft 2 to the first output shaft 7.

[0054] In this invention, the front end of the first input shaft 2 is connected to the internal combustion engine 1 (or planetary gear structure 9); the first gear unit 13 is a pair of constantly meshing gears, one type of input gear 131 is rotatably connected to the first input shaft 2, and the other type of output gear 132 is fixed to the first output shaft 7; the end of the first output shaft 7 is connected to the front wheel differential; in this invention, the first transmission unit is mainly capable of transmitting the torque of the internal combustion engine 1 to the front wheels after reducing and increasing torque at a fixed speed ratio, thus completing the mechanical transmission of the front drive path.

[0055] A single-stage reduction can meet the front wheel speed ratio requirements, with fewer parts, a shorter transmission chain, and a compact layout.

[0056] The second transmission unit mainly includes a second input shaft 6, a second gear unit, and a second output shaft 3; the second input shaft 6 is connected to the second output shaft 3 through the second gear unit.

[0057] In this invention, the second input shaft 6 is connected to the first motor 5, the second gear unit is a two-stage switchable gear pair (first stage low speed, second stage high speed); the end of the second output shaft 3 is connected to the rear wheel differential.

[0058] The torque of the first motor is transmitted to the rear wheels at a selected speed ratio to achieve pure electric rear-wheel drive or four-wheel drive assistance; based on the above design, two-stage speed ratios are achieved to balance low-speed high torque and high-speed cruising efficiency; the axle system is arranged independently, which facilitates modular installation of the rear floor.

[0059] Furthermore, in this invention, the first gear unit 13 includes an input gear 131 disposed on the first input shaft 2 and an output gear 132 disposed on the first output shaft 7; the input gear 131 meshes with the output gear 132; the input gear 131 is connected to the first input shaft 2 through a first power selection unit; the input gear 131 is rotatably connected to the first input shaft 2, and the first power selection unit includes a first synchronizer 8 disposed on the first input shaft 2, the first synchronizer 8 being able to connect with the input gear 131; the input gear 131 is a spur gear, rotating on the first input shaft 2, and can rotate freely relative to the first input shaft 2; its external teeth are constantly meshed with the output gear 132.

[0060] As the driving gear of the first gear unit 13, it transmits the torque from the internal combustion engine 1 to a type of output gear 132, thereby driving the front wheels.

[0061] The empty sleeve design prevents the gear from rotating with the shaft when not engaged, reducing oil loss during idling.

[0062] A type of output gear 132 is fixed to the first output shaft 7 and meshes externally with a type of input gear 131; the speed ratio is determined once by the ratio of the number of teeth of the two gears.

[0063] Its function is to reduce speed and increase torque, and then output power to the front wheel differential.

[0064] The first transmission unit of this invention has a single-stage transmission, which is simple in structure, has high transmission efficiency, and low noise.

[0065] The first power selection unit comprises a first synchronizer 8 (sliding sleeve type synchronization mechanism) arranged on the first input shaft 2; the splined hub of the first synchronizer 8 is fixedly connected to the first input shaft 2, and the sliding sleeve can move axially and engage / disengage with the splined end face of a type of input gear 131.

[0066] When front drive is required, a type of input gear 131 is locked to the first input shaft 2; when pure electric rear drive or four-wheel drive is disconnected, the two are separated, cutting off the power connection between the internal combustion engine 1 and the front wheels.

[0067] This invention uses only one first synchronizer 8 to realize the "on / off" of the front drive path, with the fewest number of parts.

[0068] In this invention, the engagement of the first synchronizer 8 has a small impact and the mode switching is smooth; when disconnected, the drag loss of the internal combustion engine 1 is ≈0, which improves the pure electric range.

[0069] Furthermore, in this invention, the second gear unit includes a first-stage gear unit 12 and a second-stage gear unit 11; a second power selection unit is provided between the first-stage gear unit 12 and the second-stage gear unit 11; the first-stage gear unit 12 includes a second-type input gear 121 disposed on the second input shaft 6 and a second-type output gear 122 disposed on the second output shaft 3; the second-stage gear unit 11 includes a third-type input gear 111 disposed on the second input shaft 6 and a third-type output gear 112 disposed on the second output shaft 3; the second-type input gear 121 and the third-type input gear 111 are rotatably connected to the second input shaft 6; the second power selection unit includes a second synchronizer 10 disposed on the second input shaft 6; the second synchronizer 10 can be connected to either the second-type input gear 121 or the third-type input gear 111; in this invention, the second-type input gear... A pair of constantly meshing gears is formed by gear 121 and type II output gear 122; type II input gear 121 is loosely fitted on the second input shaft 6, and type II output gear 122 is fixed on the second output shaft 3; based on the above design, a "low speed, high speed ratio" path is provided, which amplifies the torque of the first motor 5 and transmits it to the rear wheels to meet the high torque requirements for starting, climbing, etc.; at low speeds, the motor operates in a high-efficiency range, and the vehicle's power response is fast; in this invention, a pair of constantly meshing gears is formed by type III input gear 111 and type III output gear 112; type III input gear 111 is loosely fitted on the same second input shaft 6, and type III output gear 112 is fixed on the second output shaft 3; the second-stage gear unit 11 provides a "high speed, low speed ratio" path, which reduces the motor speed, reduces iron loss and noise, and improves high-speed cruising efficiency; when driving at high speeds, the motor speed decreases, the system efficiency is improved, and NVH is reduced at the same time.

[0070] In this invention, the second power selection unit includes a second synchronizer 10, which can slide axially on the second input shaft 6; the two ends of the second synchronizer 10 are respectively provided with spline gear rings corresponding to the second type input gear 121 and the third type input gear 111; the second synchronizer 10 realizes the three-position switching of "first level - neutral - second level" by axial movement, which determines which gear pair drives the rear wheel of the first motor 5.

[0071] This invention uses only one second synchronizer 10 to complete the two-stage speed ratio selection, with the fewest number of parts, which can reduce the axial dimension of the two-speed hybrid system.

[0072] The neutral position can disconnect the mechanical connection between the motor and the rear wheel when trailer or during regenerative braking, avoiding back-dragging losses. In this invention, the synchronizer stepper has low shifting impact and high reliability, making it suitable for hybrid operating conditions with frequent start-stop.

[0073] Furthermore, in this invention, the clutch unit 14 includes a clutch; the clutch is used for power transmission or disconnection between the first transmission unit and the second transmission unit; the clutch unit 14 is arranged between the first input shaft 2 and the second output shaft 3; its active friction plate is fixedly connected to the rotating part of the first transmission unit, and its driven friction plate is fixedly connected to the rotating part of the second transmission unit, and the engagement / disengagement is controlled by an electro-hydraulic or motor-ball screw actuator; when four-wheel drive or parallel operation is required, the first transmission unit and the second transmission unit are rigidly connected, so that the torque of the internal combustion engine 1 can be transmitted to the rear wheels, or the torque of the first motor 5 can be transmitted to the front wheels; in pure electric rear-wheel drive or mode, the clutch is disconnected, realizing complete decoupling of the front and rear axle power.

[0074] It can switch between three drive modes, namely front-wheel drive, rear-wheel drive and four-wheel drive, with a single clutch. The control logic is simple and the hardware is minimal. When disengaged, there is no mechanical coupling between the front and rear axles, avoiding drag loss and improving the pure electric range. When engaged, it forms a parallel four-wheel drive, instantly increasing the total output torque of the vehicle to meet the needs of rapid acceleration or off-road extrication.

[0075] Furthermore, in this invention, the internal combustion engine 1 is connected to the first input shaft 2 via a planetary gear structure 9; the planetary gear structure 9 is connected to a second motor 4; the planetary gear structure 9 includes a sun gear, planet gears, a planet carrier, and a ring gear; the planet carrier is coaxially and fixedly connected to the crankshaft of the internal combustion engine 1; the sun gear is coaxially and fixedly connected to the rotor of the second motor 4; the ring gear is coaxially and fixedly connected to the first input shaft 2; the planetary gear structure 9 and the second motor 4 work together, and their functions are as follows:

[0076] Power splitting: The mechanical power output by the internal combustion engine 1 is split into two paths according to a set ratio - one path drives the second motor 4 to generate electricity or regulate speed through the sun gear, and the other path is directly output to the first input shaft 2 through the gear ring;

[0077] Continuously variable transmission: By adjusting the speed and torque of the second motor 4, the internal combustion engine 1 is always operated in the optimal fuel economy zone, realizing the e-CVT function;

[0078] Starter function: When stationary, the second motor 4 can reverse the direction of the internal combustion engine 1 to the ignition speed, eliminating the need for a traditional starter motor.

[0079] A single planetary gear set can simultaneously perform three functions: power distribution, continuously variable transmission, and starting, reducing the number of system parts; the internal combustion engine's operating point is fixed in the high-efficiency range, reducing overall vehicle fuel consumption; the planetary gear set has a short axial dimension, making it easy to arrange horizontally or vertically, improving the utilization rate of engine compartment space.

[0080] A vehicle includes the dual-speed hybrid system; the dual-speed hybrid system includes an internal combustion engine 1, a first motor 5, a second motor 4, and a planetary gear structure 9, wherein the planet carrier is connected to the internal combustion engine 1, and the sun gear is connected to the second motor 4.

[0081] The first transmission unit includes a first input shaft 2, which is connected to the gear ring of the planetary gear mechanism; and a first output shaft 7, which is used to drive the front wheel.

[0082] The first gear unit 13 is disposed between the first input shaft 2 and the first output shaft 7; the first power selection unit is used to selectively engage or disengage the first gear unit 13 from the first input shaft 2.

[0083] In this invention, the second transmission unit includes a second input shaft 6 connected to the first motor 5; a second output shaft 3 for driving the rear wheels; a first-stage gear unit 12 and a second-stage gear unit 11, both disposed between the second input shaft 6 and the second output shaft 3; a second power selection unit for selectively engaging the first-stage gear unit 12 or the second-stage gear unit 11 with the second input shaft 6 to achieve two rear-drive gears; and a clutch disposed between the first transmission unit and the second transmission unit for selectively connecting or disconnecting the power between the first input shaft 2 and the second output shaft 3 to achieve a four-wheel drive mode.

[0084] The internal combustion engine 1 is generally a reciprocating piston engine or a rotary engine, with the crankshaft output end fixedly connected to the planetary gear mechanism / first input shaft 2; it outputs mechanical work when needed, serving as the main energy source for the entire vehicle; it can also be towed and started; it provides power for continuous high-speed cruising and high-load conditions, ensuring long-distance driving range.

[0085] The first motor 5 is generally a permanent magnet synchronous motor or an induction motor, with the rotor fixedly connected to the second input shaft 6; it integrates an inverter and a high-voltage bus; it provides pure electric drive for the rear wheels and parallel assistance.

[0086] It achieves two-speed pure electric rear-wheel drive and brake energy recovery to improve fuel economy.

[0087] The second motor is a permanent magnet synchronous motor with its rotor fixedly connected to the sun gear of the planetary gear mechanism; it can also be called a "generator / starter integrated machine".

[0088] In power split mode, the torque is absorbed or output to adjust the operating point of the internal combustion engine 1, so that the internal combustion engine 1 always operates in the high-efficiency range, reducing fuel consumption and emissions.

[0089] The planetary gear structure 9 is a simple single planetary gear set, including a sun gear, planet gears, a planet carrier, and a ring gear; the planet carrier is connected to the internal combustion engine 1, the sun gear is connected to the second motor 4, and the ring gear is connected to the first input shaft 2; the power of the internal combustion engine 1 is decomposed into power generation power and direct drive power; power can also be synthesized in the reverse direction; it realizes the power splitting function of continuously variable transmission, taking into account both power and economy.

[0090] The first transmission unit includes a first input shaft 2; it is generally a solid or hollow stepped shaft, with its front end fixed to the planetary gear ring and its rear end supported in the reduction housing by bearings; it introduces the power of the internal combustion engine 1 / planetary gear set into the first gear unit 13; it realizes torque transmission and provides an installation reference for the first gear unit 13.

[0091] The first output shaft 7 is connected to the input gear of the front axle differential, enabling the transmission of the output torque of the first gear unit 13 to the front wheels, ensuring efficient and low-noise front wheel drive path.

[0092] The first gear unit 13 includes an input gear 131 rotatably connected to the first input shaft 2 and an output gear 132 fixed to the first output shaft 7; it achieves a fixed speed ratio for speed reduction and torque increase; and it makes the speed-torque characteristics of the internal combustion engine 1 match the wheel requirements, thereby improving acceleration performance.

[0093] The first power selection unit includes a first synchronizer 8; the first synchronizer 8 is arranged on the first input shaft 2 and can engage or disengage with the splined hub of a type of input gear 131; in pure electric / braking / trailer mode, it disconnects the internal combustion engine 1 from the front wheels to reduce towing losses; it increases the pure electric range and reduces mechanical wear.

[0094] The second transmission unit includes a second input shaft 6, which is connected to the first motor 5. Generally, a spline or flange direct connection can be used, or it can be connected through a clutch. The specific choice can be made according to the needs.

[0095] The second input shaft 6 receives the torque from the first motor 5 and transmits it to the first / second stage gear unit 11, providing a two-speed ratio source for the rear axle.

[0096] The second output shaft 3 is connected to the input gear of the rear wheel differential, and its function is to transmit the torque of the first motor 5 to the rear wheel, thereby realizing the rear-wheel drive of the vehicle.

[0097] The primary gear unit 12 is a low-speed, high-ratio gear pair (Z1 / Z2), which is loosely fitted on the second input shaft 6 and can be engaged through the second synchronizer 10; it provides low-speed, high-torque pure electric drive; and improves starting acceleration and hill-climbing ability.

[0098] The secondary gear unit 11, a high-speed, low-ratio gear pair (Z3 / Z4), is loosely fitted on the second input shaft 6 and can be engaged via the second synchronizer 10; it provides high-speed cruising pure electric drive; it reduces the speed of the first motor 5, improves high-speed efficiency, and reduces noise.

[0099] In the second power selection unit, the second synchronizer 10 is mounted on the second input shaft 6 and can switch between three positions: "neutral - first level - second level"; it can achieve two-speed switching of rear drive; in four-wheel drive mode, it can also lock the first or second level; it can balance low-speed power and high-speed efficiency.

[0100] Furthermore, the dual-speed hybrid system described in this invention can realize multiple driving modes: namely, front-wheel drive mode, rear-wheel drive mode, and four-wheel drive mode; in use: firstly, the driving mode of the dual-speed hybrid system is determined; vehicle operation control is realized according to the specific driving mode; according to the target driving mode, the engagement state of the first power selection unit, the second power selection unit, and the clutch is controlled to output power to the front wheels, rear wheels, or both front and rear wheels simultaneously.

[0101] Control strategy:

[0102] Within 0–15km / h, the default is pure electric rear-wheel drive + first gear;

[0103] If the speed is above 15m / h and the required torque is greater than the threshold, the parallel clutch will be engaged to enter four-wheel drive or parallel rear-wheel drive.

[0104] Example 1:

[0105] This invention discloses a dual-speed hybrid system, including an internal combustion engine 1 and a first electric motor 5; the internal combustion engine 1 and / or the first electric motor 5 are connected to the front wheels and / or the rear wheels via a transmission unit; both the internal combustion engine 1 and / or the first electric motor 5 can drive the front wheels and / or the rear wheels; the transmission unit includes a first transmission unit and a second transmission unit; the first transmission unit is connected to the second transmission unit via a clutch unit 14; the internal combustion engine 1 is connected to the front wheels via the first transmission unit; the first electric motor 5 is connected to the rear wheels via the second transmission unit; the first transmission unit includes a first input shaft 2 and a first output shaft 7; the first input shaft 2 is connected to the first output shaft 7 via a first gear unit 13; the second transmission unit includes a second input shaft 6 and a second output shaft 3; the second input shaft 6 is connected to the second output shaft 3 via a second gear unit.

[0106] The present invention aims to create a hybrid architecture that can realize multi-level series-parallel hybrid and power split functions, which can combine the advantages of power split, high energy utilization, driving comfort in pure electric mode and strong power in parallel mode, and provide multiple driving modes to meet the needs of road conditions and driving experience.

[0107] The basic structure of the present invention includes an internal combustion engine 1, a generator, a drive motor, a planetary gear structure 9, a clutch, a first synchronizer 8, and a second synchronizer 10.

[0108] The generator is the second motor 4 in this invention; the drive motor is the first motor 5 in this invention.

[0109] The internal combustion engine 1 is connected to the planet carrier of the planetary gear structure 9, and the generator is connected to the sun gear of the planetary gear structure 9 to drive the second motor 4. The first input shaft 2, which is connected to the gear ring structure of the planetary gear structure 9, is responsible for driving the vehicle. The one-way clutch is located between the planetary gear structure 9 and the first motor 5. The first synchronizer 8 is located at the front end of the clutch, and the second synchronizer 10 is located at the rear end of the clutch.

[0110] The pure electric mode is achieved by adding a clutch between the planetary gear structure 9 and the first motor 5, which can decouple the engine from the power transmission. In this case, the first motor 5 drives the engine alone and has two gears.

[0111] The power split mode is implemented as follows: the internal combustion engine 1 transmits power to the planetary gear structure 9 through the planetary carrier, and then part of the power is output by the sun gear to the second motor 4 to generate electricity, store the energy in the battery or drive the first motor 5 to work, and the other part of the power is output by the gear ring to the wheel end.

[0112] The first motor 5 and the gear ring output structure are arranged in parallel. The first motor 5 can change its own power according to the needs of the vehicle's power performance, and can also supplement the required power when necessary. Therefore, the internal combustion engine 1 always maintains a high-efficiency speed range, improving the vehicle's economy.

[0113] The front-wheel drive mode is implemented as follows: the internal combustion engine 1 is working, the clutch is disengaged, the first synchronizer 8 is engaged in the left gear, and the power is transmitted forward through the first gear unit 13 to achieve front-wheel drive.

[0114] The rear-wheel drive mode is implemented as follows: 1. The internal combustion engine 1 is working, the clutch is engaged, the first synchronizer 8 is in neutral, and the power is transmitted to the second output shaft 3 through the first input shaft 2 to achieve rear-wheel drive.

[0115] 2. When the internal combustion engine is not working, the first motor 5 is working, the clutch is disengaged, and two-speed pure electric rear drive can be achieved.

[0116] 3. The first motor 5 and the internal combustion engine 1 work simultaneously, the clutch is engaged, and the first synchronizer 8 is in neutral. At this time, the parallel rear-drive mode can be realized.

[0117] How to achieve four-wheel drive mode: Engage the left gear position with the first synchronizer 8, and the clutch will engage to achieve four-wheel drive mode.

[0118] The specific working principle is as follows:

[0119] Starting method 1: Started by the first motor 5. At this time, the clutch is disengaged, realizing pure electric rear-drive start. When the vehicle speed gradually increases to the speed at which the engine can stably engage, the clutch engages, and the engine starts and starts working. At this time, the first motor 5 can choose to keep working or stop working according to the power demand.

[0120] Power splitting principle: After the engine starts, it transmits power to the planetary carrier. Through the motion decomposition function of the planetary gears, a part of the power is output to the second motor 4 to generate electricity, and the other part of the power is output to the gear ring and then transmitted to the drive shaft, thus realizing power splitting.

[0121] Drive mode switching principle: When the engine is running, the clutch can control whether to transmit power to the rear wheels, and the first synchronizer 8 can control whether to transmit power to the front wheels. Through different combinations of control, front-wheel drive, rear-wheel drive and four-wheel drive modes can be realized.

[0122] The present invention achieves the effect of power splitting through planetary gear structure 9.

[0123] Simultaneously, through the cooperation of the first synchronizer 8, the second synchronizer 10, and the clutch, the switching between front-wheel drive, rear-wheel drive, and four-wheel drive modes is realized.

[0124] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A dual-speed hybrid system, characterized in that, Including an internal combustion engine and a first electric motor; The internal combustion engine and / or the first electric motor are connected to the front wheel and / or the rear wheel via a transmission unit; The internal combustion engine and / or the first electric motor can both drive the front wheels and / or the rear wheels. The transmission unit includes a first transmission unit and a second transmission unit; the first transmission unit is connected to the second transmission unit via a clutch unit; The internal combustion engine is connected to the front wheel via a first transmission unit; The first motor is connected to the rear wheel via the second transmission unit.

2. The dual-speed hybrid system according to claim 1, characterized in that, The first transmission unit includes a first input shaft and a first output shaft; the first input shaft is connected to the first output shaft via a first gear unit; The second transmission unit includes a second input shaft and a second output shaft; the second input shaft is connected to the second output shaft through a second gear unit.

3. The dual-speed hybrid system according to claim 2, characterized in that, The first gear unit includes an input gear disposed on a first input shaft and an output gear disposed on a first output shaft; the input gear meshes with the output gear; the input gear is connected to the first input shaft through a first power selection unit.

4. A dual-speed hybrid system according to claim 3, characterized in that, The input gear is rotatably connected to the first input shaft, and the first power selection unit includes a first synchronizer disposed on the first input shaft, which can be connected to the input gear.

5. A dual-speed hybrid system according to claim 2, characterized in that, The second gear unit includes a first-stage gear unit and a second-stage gear unit; a second power selection unit is provided between the first-stage gear unit and the second-stage gear unit; The primary gear unit includes a second type of input gear disposed on the second input shaft and a second type of output gear disposed on the second output shaft; The secondary gear unit includes three types of input gears mounted on the second input shaft and three types of output gears mounted on the second output shaft; The second type of input gear and the third type of input gear are rotatably connected to the second input shaft; The second power selection unit includes a second synchronizer disposed on the second input shaft; the second synchronizer can be connected to a type II input gear or a type III input gear.

6. A dual-speed hybrid system according to claim 1, characterized in that, The clutch unit includes a clutch; the clutch is used for power transmission or disconnection between the first transmission unit and the second transmission unit.

7. A dual-speed hybrid system according to claims 1-6, characterized in that, The internal combustion engine is connected to the first input shaft via a planetary gear structure.

8. A dual-speed hybrid system according to claim 7, characterized in that, The planetary gear structure is connected to a second motor.

9. A vehicle, characterized in that, Includes the dual-speed hybrid system as described in any one of claims 1-8.

10. A vehicle according to claim 9, characterized in that, The dual-speed hybrid system can achieve multiple driving modes: These are: front-wheel drive mode, rear-wheel drive mode, and four-wheel drive mode; When using it: First, determine the driving mode of the dual-speed hybrid system; then, control the vehicle's operation according to the specific driving mode.

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