Hybrid coupling system and vehicle

Abstract

The hybrid power coupling system and vehicle of the present invention include an engine, a first motor, a planetary gear, a brake, a first clutch, an input shaft and a first intermediate shaft, wherein the engine and the first motor are both connected to the input shaft, and the input shaft is connected to the first intermediate shaft through a first gear pair; the sun gear is loosely sleeved on the first intermediate shaft, and the brake is used to brake the sun gear; the ring gear is fixed on the first intermediate shaft, and any two structures among the sun gear, the planetary carrier and the ring gear are connected through the first clutch, and the planetary carrier is meshed with the output ring gear of the differential; the first clutch and the brake are controlled to switch the two speed ratios of the planetary gear, so that the engine and the first motor can both be output at two speed ratios, and have good power and economy; the planetary gear is connected to the first intermediate shaft to avoid the planetary gear being coaxial with the engine or the first motor, thereby reducing the axial length of the hybrid power coupling system, which is beneficial to saving space, lightening and reducing costs.

Description

Technical Field

[0001] The present invention belongs to the field of new energy vehicles, and in particular relates to a hybrid power coupling system and a vehicle. Background Art

[0002] The power system includes an engine (internal combustion engine) and a transmission system consisting of a transmission, a differential and a drive shaft; its function is to provide the vehicle with the driving power required by the drive wheels. The internal combustion engine has a certain speed and torque range, and achieves the best working state within a very small range, at which time either the fuel consumption is minimized, or the harmful emissions are minimized, or both. However, the actual road conditions are ever-changing, which is not only reflected in the speed of the drive wheels, but also in the torque required by the drive wheels. Therefore, achieving the optimal speed and torque of the internal combustion engine, that is, the optimal power state, and matching it well with the power state of the drive wheels is the primary task of the transmission.

[0003] At present, there are two main types of transmissions on the market: stepped transmissions and continuously variable transmissions. Stepped transmissions are further divided into manual and automatic. Most of them provide a limited number of discrete output-input speed ratios through different meshing arrangements of gear trains or planetary gear trains. The adjustment of the drive wheel speed between two adjacent speed ratios depends on the speed change of the internal combustion engine. Continuously variable transmissions, whether mechanical, hydraulic, or electromechanical, can provide an unlimited number of continuously selectable speed ratios within a certain speed range. In theory, the speed change of the drive wheel can be completely completed through the transmission. In this way, the internal combustion engine can work within the optimal speed range as much as possible. At the same time, compared with stepped transmissions, continuously variable transmissions have many advantages such as smooth speed regulation and full use of the maximum power of the internal combustion engine. Therefore, continuously variable transmissions have been the subject of research by engineers from various countries for many years.

[0004] In recent years, the birth of motor hybrid technology has opened up new ways to achieve a complete match between the power of the internal combustion engine and the power wheel. Among the numerous powertrain design cases, the most representative are the series hybrid system and the parallel hybrid system. In the motor series hybrid system, the internal combustion engine-generator-motor-shaft system-drive wheel form a series power chain, and the powertrain structure is extremely simple. Among them, the generator-motor combination can be regarded as a transmission in the traditional sense. When used in conjunction with energy storage devices such as batteries, capacitors, etc., the transmission can also be used as an energy regulation device to complete the independent regulation of speed and torque.

[0005] The motor parallel system has two parallel independent power chains. One consists of a traditional mechanical transmission, and the other consists of a motor-battery system. The mechanical transmission is responsible for speed regulation, while the motor-battery system is responsible for power or torque regulation. In order to fully realize the potential of the entire system, the mechanical transmission also needs to adopt a continuously variable transmission method.

[0006] The advantages of the series hybrid system are simple structure and flexible layout. However, since all the power passes through the generator and the motor, the motor has high power requirements, large size and heavy weight. At the same time, since the energy transmission process undergoes two conversions from machine to electricity and from electricity to machine, the efficiency of the entire system is low. In the parallel hybrid system, only part of the power passes through the motor system, so the power requirement for the motor is relatively low. The overall system efficiency is high. However, this system requires two independent subsystems and is expensive. It is usually only used in weak hybrid systems.

[0007] In an existing power coupling system, the engine, generator and planetary gear are coaxially arranged on the input shaft. The engine and generator both output power to the planetary gear, which then transmits the power to the intermediate shaft, and then outputs it to the wheel end after being reduced by the main reduction gear pair. The axial dimension of the input end of this scheme is large, resulting in a large overall axial dimension of the power coupling system and low space utilization; the planetary gear does not directly mesh with the output ring gear of the differential, and an additional gear needs to be set on the intermediate shaft to mesh with the output ring gear of the differential to achieve the main reduction of the power output from the planetary gear, which is a relatively complex structure. Summary of the invention

[0008] The technical problem to be solved by the present invention is: to provide a hybrid power coupling system and a vehicle in view of the problem that the axial dimension of the power coupling system of the existing solution is large.

[0009] To solve the above technical problems, an embodiment of the present invention provides a hybrid power coupling system, comprising an engine, a first motor, a planetary gear, a brake, a first clutch, an input shaft and a first intermediate shaft, wherein the planetary gear comprises a sun gear, a planetary carrier and a ring gear, the engine and the first motor are both connected to the input shaft, and the input shaft is connected to the first intermediate shaft through a first gear pair;

[0010] The sun gear is loosely sleeved on the first intermediate shaft, and the brake is used for braking the sun gear;

[0011] The ring gear is fixed on the first intermediate shaft, any two structures among the sun gear, the planet carrier and the ring gear are connected via a first clutch, and the planet carrier is meshed with the output ring gear of the differential.

[0012] Optionally, a second clutch is further included, and the engine is connected to the input shaft via the second clutch.

[0013] Optionally, a second motor is further included, and the second motor is transmission-connected to the output ring gear of the differential.

[0014] Optionally, it also includes a second gear pair, a second intermediate shaft and a first gear, the second motor is connected to the second intermediate shaft through the second gear pair, the first gear is fixed on the second intermediate shaft and meshes with the output ring gear of the differential.

[0015] Optionally, a third gear pair is further included, and the first motor is transmission-connected to the input shaft via the third gear pair.

[0016] Optionally, the first gear pair includes a second gear and a third gear, the second gear is fixed on the input shaft, and the third gear is fixed on the first intermediate shaft;

[0017] The second gear pair includes a fourth gear and a fifth gear, the fourth gear is coaxially connected to the second motor, the fifth gear is fixed on the second intermediate shaft, and the diameter of the fifth gear is greater than the diameter of the fourth gear;

[0018] The third gear pair includes a sixth gear and a seventh gear, the sixth gear is coaxially connected to the first motor, the seventh gear is fixed on the input shaft, and the diameter of the seventh gear is greater than the diameter of the sixth gear.

[0019] Optionally, the hybrid power coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, hybrid drive first gear mode and hybrid drive second gear mode:

[0020] The first clutch is released, the brake is engaged, the first motor starts the engine, and the engine is driven to establish a direct drive first gear mode of the engine;

[0021] The first clutch is engaged, the brake is released, the first motor starts the engine, and the engine is driven to establish a direct-drive second-gear mode of the engine;

[0022] The first clutch is released, the brake is engaged, the first motor drives and starts the engine, and the engine is driven to establish the hybrid drive first gear mode;

[0023] The first clutch is engaged, the brake is released, the first motor drives and starts the engine, and the engine is driven to establish the hybrid drive second gear mode.

[0024] Optionally, the hybrid power coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, single motor pure electric mode, hybrid drive first gear mode and hybrid drive second gear mode:

[0025] The first clutch is released, the second clutch is engaged, the brake is engaged, the first motor starts the engine, and the engine is driven to establish a direct drive first gear mode of the engine;

[0026] The first clutch is engaged, the second clutch is engaged, the brake is released, the first motor starts the engine, and the engine is driven to establish a direct drive second gear mode of the engine;

[0027] The first clutch is released, the second clutch is released, the brake is released, the engine and the first motor are not operated, and the first motor is driven to establish the single-motor pure electric mode;

[0028] The first clutch is released, the second clutch is engaged, the brake is engaged, the first motor drives and starts the engine, and the engine is driven to establish the hybrid drive first gear mode;

[0029] The first clutch is engaged, the second clutch is engaged, the brake is released, the first motor drives and starts the engine, and the engine drives to establish the hybrid drive second gear mode.

[0030] Optionally, when the second clutch is not present, the hybrid coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, single motor pure electric mode, hybrid drive first gear mode, hybrid drive second gear mode and range extension mode:

[0031] The first clutch is released, the brake is engaged, the first motor starts the engine, the engine is driven, and the second motor is not operated, so as to establish a direct drive first gear mode of the engine;

[0032] The first clutch is engaged, the brake is released, the first motor starts the engine, the engine is driven, and the second motor is not operated, so as to establish a direct drive second gear mode of the engine;

[0033] The first clutch is released, the brake is released, the engine and the first motor are not operated, and the second motor is driven, so as to establish the single-motor pure electric mode;

[0034] The first clutch is released, the brake is engaged, the first motor generates electricity and starts the engine, the engine drives, and the second motor drives, so as to establish the hybrid drive first gear mode;

[0035] The first clutch is engaged, the brake is released, the first motor generates electricity and starts the engine, the engine is driven, and the second motor is driven to establish the hybrid drive second gear mode;

[0036] The first clutch is released, the brake is released, the first motor starts the engine, the engine drives the first motor to generate electricity, and the second motor drives, so as to establish the extended range mode;

[0037] When the second clutch is provided, the hybrid coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, single motor pure electric mode, dual motor pure electric first gear mode, dual motor pure electric second gear mode, hybrid drive first gear mode, hybrid drive second gear mode and range extension mode:

[0038] The first clutch is released, the second clutch is engaged, the brake is engaged, the first motor starts the engine, the engine is driven, and the second motor is not operated, so as to establish a direct drive first gear mode of the engine;

[0039] The first clutch is engaged, the second clutch is engaged, the brake is released, the first motor starts the engine, the engine is driven, and the second motor is not operated, so as to establish a direct drive second gear mode of the engine;

[0040] The first clutch is released, the second clutch is released, the brake is released, the engine and the first motor are not operated, and the second motor is driven, so as to establish the single-motor pure electric mode;

[0041] The first clutch is released, the second clutch is released, the brake is engaged, the engine is not operated, and the first motor and the second motor are driven to establish the dual-motor pure electric first gear mode;

[0042] The first clutch is engaged, the second clutch is disengaged, the brake is disengaged, the engine is not operated, and the first motor and the second motor are driven to establish the dual-motor pure electric second gear mode;

[0043] The first clutch is released, the second clutch is engaged, the brake is engaged, the first motor generates electricity and starts the engine, the engine drives, and the second motor drives, so as to establish the hybrid drive first gear mode;

[0044] The first clutch is engaged, the second clutch is engaged, the brake is released, the first motor generates electricity and starts the engine, the engine drives, and the second motor drives, so as to establish the hybrid drive second gear mode;

[0045] The first clutch is released, the second clutch is engaged, the brake is released, the first motor starts the engine, the engine drives the first motor to generate electricity, and the second motor drives to establish the extended-range mode.

[0046] An embodiment of the present invention provides a vehicle, comprising the aforementioned hybrid power coupling system.

[0047] The hybrid coupling system and vehicle provided by the embodiment of the present invention can switch between two speed ratios of the planetary gear by controlling the working state (engagement or disengagement) of the first clutch and the brake. The output ring gear of the planetary carrier and the differential constitutes the main reduction gear pair for the engine and the first motor to output power to the wheels, so that the engine and the first motor can both reduce the output at two speed ratios, realize two-speed drive, and have good power and economy. The engine and the first motor are connected to the input shaft. When the engine and the first motor are driven at the same time, the input shaft couples the power of the engine and the first motor. The planetary gear is connected to the first intermediate shaft to avoid the planetary gear being coaxial with the engine or the first motor, thereby reducing the axial length of the hybrid coupling system, which is beneficial to saving space, lightening and reducing costs. In the hybrid drive mode, the engine can stably operate in the high-efficiency range through the speed regulation of the first motor, thereby optimizing the working range of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The structure of the hybrid power coupling system provided by the embodiment of the present invention is simplified as follows: Figure 1 ;

[0049] Figure 2 for Figure 1 The power transmission roadmap of the hybrid coupling system in the single-motor pure electric mode is shown;

[0050] Figure 3 for Figure 1 The power transmission roadmap of the hybrid coupling system in the dual-motor pure electric first gear mode is shown;

[0051] Figure 4 for Figure 1 The power transmission roadmap of the hybrid coupling system in the dual-motor pure electric second gear mode is shown;

[0052] Figure 5 for Figure 1 The power transmission route diagram of the hybrid coupling system in the hybrid drive first gear mode is shown;

[0053] Figure 6 for Figure 1 The power transmission route diagram of the hybrid coupling system in the hybrid drive second gear mode is shown;

[0054] Figure 7 for Figure 1 The power transmission route diagram of the hybrid coupling system in the extended range mode is shown;

[0055] Figure 8The structure of the hybrid power coupling system provided by the embodiment of the present invention is simplified as follows: Figure 2 ;

[0056] The reference numerals in the specification are as follows:

[0057] 1. Engine; 2. First motor; 3. Second motor;

[0058] 4. Planetary gear; 41. Sun gear; 42. Planetary carrier; 43. Ring gear; 5. Brake;

[0059] 6. First clutch; 7. Input shaft; 8. First intermediate shaft; 9. Second clutch; 10. Second intermediate shaft; 11. First gear;

[0060] 121, second gear; 122, third gear;

[0061] 131, fourth gear; 132, fifth gear;

[0062] 141, sixth gear; 142, seventh gear;

[0063] 15. Torsional damper or dual mass flywheel; 16. Differential; 161. Output ring gear; 17. Wheel. DETAILED DESCRIPTION

[0064] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0065] like Figure 1 and Figure 8 As shown, the hybrid coupling system provided by the embodiment of the present invention includes an engine 1, a first motor 2, a planetary gear 4, a brake 5, a first clutch 6, an input shaft 7 and a first intermediate shaft 8, and the planetary gear 4 includes a sun gear 41, a planet carrier 42 and a ring gear 43;

[0066] The engine 1 and the first motor 2 are both connected to the input shaft 7, and the input shaft 7 is connected to the first intermediate shaft 8 through a first gear pair;

[0067] The sun gear 41 is loosely sleeved on the first intermediate shaft 8, and the brake 5 is used to brake the sun gear 41;

[0068] The ring gear 43 is fixed on the first intermediate shaft 8, and any two structures among the sun gear 41, the planet carrier 42 and the ring gear 43 are connected via the first clutch 6 ( Figure 1 and Figure 84 shows that the sun gear 41 is connected to the ring gear 43 via the first clutch 6 , and the planet carrier 42 is meshed with the output ring gear 161 of the differential 16 .

[0069] The hybrid coupling system provided by the embodiment of the present invention can switch between two speed ratios of the planetary gear set 4 by controlling the working states (engagement or disengagement) of the first clutch 6 and the brake 5. The planetary carrier 42 and the output ring gear 161 of the differential 16 constitute the main reduction gear pair for the engine 1 and the first motor 2 to output power toward the wheel 17, so that the engine 1 and the first motor 2 can both reduce the output at two speed ratios to achieve two-speed drive with good power and economy. The engine 1 and the first motor 2 are connected to the input shaft 7. When the engine 1 and the first motor 2 are driven at the same time, the input shaft 7 couples the power of the engine 1 and the first motor 2. The planetary gear set 4 is connected to the first intermediate shaft 8 to avoid the planetary gear set 4 being coaxial with the engine 1 or the first motor 2, thereby reducing the axial length of the hybrid coupling system, which is beneficial to saving space, lightening and reducing costs. In the hybrid drive mode, the engine 1 can stably operate in the high-efficiency range through the speed regulation of the first motor 2, thereby optimizing the working range of the engine 1.

[0070] The first motor 2 can be used for both driving and generating electricity, and the system cost is low.

[0071] Specifically, the first motor 2 is also used as a starter motor for starting the engine 1. If the first motor 2 is not driven or does not generate electricity, and the engine 1 is driven, the first motor 2 starts the engine 1 and then stops working; if the first motor 2 is driven or generates electricity, and the engine 1 is driven, the first motor 2 starts the engine 1 and then keeps working.

[0072] Among them, whether the first gear pair decelerates can be selected according to the power demand of the wheel end. Specifically, if the main reduction effect through the planetary carrier 42 and the output ring gear 161 of the differential 16 is sufficient to match the power demand of the wheel 17, the first gear pair can only play a transitional connection role, transmitting power without speeding up or slowing down. If the main reduction effect through the planetary carrier 42 and the output ring gear 161 of the differential 16 is insufficient to match the power demand of the wheel 17, the first gear pair selects the reduction gear pair. If the reduction ratio between the planetary carrier 42 and the output ring gear 161 of the differential 16 is too large, the first gear pair selects the speed increasing gear pair.

[0073] Specifically, Figure 1 and Figure 8 As shown, the first gear pair includes a second gear 121 and a third gear 122. The second gear 121 is fixed on the input shaft 7, and the third gear 122 is fixed on the first intermediate shaft 8. The structure is simple and the transmission is stable.

[0074] In one embodiment, if Figure 1As shown, the second clutch 9 is also included, and the engine 1 is connected to the input shaft 7 through the second clutch 9. The power transmission between the engine 1 and the input shaft 7 can be connected or disconnected through the second clutch 9, and the engine 1 can be connected to the power system as needed to realize the engine direct mode, hybrid mode and other modes that require the participation of the engine 1, or the power output of the engine 1 can be cut off when the power system is disconnected to realize the electric mode, thereby realizing more working modes and better matching the power requirements of the vehicle.

[0075] In one embodiment, if Figure 1 and Figure 8 As shown, the second motor 3 is also included, and the second motor 3 is connected to the output ring gear 161 of the differential 16. It can realize dual-motor pure electric. During the mode switching process, the second motor 3 participates in the drive, and there is no power interruption. In the extended-range mode, the first motor 2 generates electricity to supply the second motor 3. It can work for a long time in the mode of being driven by the engine 1 and the second motor 3. It has better power performance, and a smaller first motor 2 and second motor 3 can be used. The output ring gear 161 of the differential 16 couples the power from the planetary gear 4 and the second motor 3.

[0076] In one embodiment, if Figure 1 and Figure 8 As shown, the second gear pair, the second intermediate shaft 10 and the first gear 11 are also included. The second motor 3 is connected to the second intermediate shaft 10 through the second gear pair. The first gear 11 is fixed on the second intermediate shaft 10 and meshes with the output ring gear 161 of the differential 16. The power output by the second motor 3 is transmitted to the second intermediate shaft 10 through the second gear pair, and then mainly reduced by the first gear 11 and the output ring gear 161 of the differential 16, which can better match the power requirements of the wheels 17, and the hybrid coupling system can be configured with a smaller second motor 3. It is preferred that the second gear pair is a reduction gear pair so as to configure a smaller second motor 3, which is conducive to saving space, light weight and reducing costs.

[0077] Specifically, the second gear pair includes a fourth gear 131 and a fifth gear 132. The fourth gear 131 is coaxially connected to the second motor 3, and the fifth gear 132 is fixed on the second intermediate shaft 10. The diameter of the fifth gear 132 is greater than the diameter of the fourth gear 131. The structure is simple and realizes the reduction transmission from the second motor 3 to the second intermediate shaft 10.

[0078] In one embodiment, if Figure 1 and Figure 8As shown, the third gear pair is also included, and the first motor 2 is connected to the input shaft 7 through the third gear pair. The first motor 2 and the engine 1 are not coaxial, which can shorten the axial size of the hybrid coupling system. Preferably, the third gear pair is a speed-increasing gear pair for realizing the speed-increasing connection between the input shaft 7 and the first motor 2, so that when the engine 1 drives the first motor 2 to generate electricity, the speed-increasing transmission power from the input shaft 7 to the first motor 2 is realized, and when the first motor 2 outputs power, the speed-increasing transmission power from the first motor 2 to the input shaft 7 is realized, so that a smaller first motor 2 can be configured, which is conducive to saving space, light weight and reducing costs.

[0079] Specifically, the third gear pair includes a sixth gear 141 and a seventh gear 142, the sixth gear 141 is coaxially connected to the first motor 2, the seventh gear 142 is fixed to the input shaft 7, and the diameter of the seventh gear 142 is greater than the diameter of the sixth gear 141. The structure is simple, and the reduction transmission from the first motor 2 to the input shaft 7 and the speed increase transmission from the input shaft 7 to the first motor 2 are realized.

[0080] In one embodiment, if Figure 1 As shown, a torsional vibration damper or a dual mass flywheel 15 is provided on the shaft of the engine 1 to prevent the shaft of the engine 1 from transmitting vibration to the power output end of the hybrid coupling system.

[0081] In the preferred embodiment of the present application, the engine 1 is located on the input shaft 7, the first motor 2 is parallel to the input shaft 7 and is connected to the input shaft 7 through a third gear pair, the second motor 3 is connected to a second intermediate shaft 10 parallel to the input shaft 7 through a second gear pair, and the planetary gear 4 is arranged on the first intermediate shaft 8 parallel to the input shaft 7, which can greatly shorten the axial length.

[0082] The following describes a preferred embodiment of the control involving the brake 5, the first clutch 6 and the second clutch 9:

[0083] Example 1

[0084] When the second clutch 9 and the second motor 3 are provided, the hybrid coupling system has multiple working modes such as engine direct drive mode (engine direct drive first gear mode, engine direct drive second gear mode), pure electric mode (single motor pure electric mode, dual motor pure electric first gear mode, dual motor pure electric second gear mode), hybrid drive mode (hybrid drive first gear mode, hybrid drive second gear mode), and range extension mode.

[0085] Among them, the aforementioned working modes are reflected in a table.

[0086] Table 1

[0087]

[0088] The following modes, combined Figures 2 to 7 Explain the power transmission route of the hybrid coupling system;

[0089] (1) Engine direct drive first gear mode

[0090] The first clutch 6 is separated, the second clutch 9 is engaged, the brake 5 is engaged, the first motor 2 starts the engine 1, the engine 1 is driven, and the second motor 3 is not working, so as to establish the engine direct drive first gear mode; the power transmission route is: engine 1 -> input shaft 7, second gear 121 -> third gear 122, first intermediate shaft 8, ring gear 43 -> planetary carrier 42 -> differential 16 -> wheel 17.

[0091] In the engine direct drive first gear mode, the power of the engine 1 is transmitted to the first intermediate shaft 8 via the input shaft 7, the second gear 121, and the third gear 122, and then input into the planetary gear row 4 from the ring gear 43 for deceleration, and then is decelerated via the planetary carrier 42 and the output ring gear 161 of the differential 16, thereby realizing a two-stage deceleration of the output power of the engine 1.

[0092] At all vehicle speeds, the hybrid coupling system can enter the engine direct drive first gear mode.

[0093] (2) Engine direct drive second gear mode

[0094] The first clutch 6 is engaged, the second clutch 9 is engaged, the brake 5 is released, the first motor 2 starts the engine 1, the engine 1 is driven, and the second motor 3 is not working, so as to establish the engine direct drive second gear mode; the power transmission route is: engine 1 -> input shaft 7, second gear 121 -> third gear 122, first intermediate shaft 8, planetary gear 4 -> differential 16 -> wheel 17.

[0095] In the engine direct drive second gear mode, the power of the engine 1 is transmitted to the first intermediate shaft 8 via the input shaft 7, the second gear 121, and the third gear 122, and then transmitted to the output ring gear 161 of the differential 16 via the planetary gear 4, and the planetary carrier 42 and the output ring gear 161 of the differential 16 perform the main reduction, thereby realizing a first-stage reduction in the output power of the engine 1.

[0096] At all vehicle speeds, the hybrid coupling system can enter the engine direct drive second gear mode.

[0097] (3) Single-motor pure electric mode

[0098] The first clutch 6 is released, the second clutch 9 is released, the brake 5 is released, the engine 1 and the first motor 2 are not operated, and the second motor 3 is driven to establish a single-motor pure electric mode;

[0099] Specifically, Figure 2As shown, the power transmission route in this driving mode is: second motor 3 -> fourth gear 131 -> fifth gear 132 , second intermediate shaft 10 -> first gear 11 -> differential 16 -> wheel 17 .

[0100] In the single-motor pure electric mode, the power output by the second motor 3 is decelerated by the fourth gear 131 and the fifth gear 132 and the fifth gear 132 and the output ring gear 43, and then output to the wheel 17, thereby realizing a two-stage power reduction transmission when the second motor 3 drives the wheel 17.

[0101] When the power battery is fully charged and the vehicle speed requirement is full vehicle speed, the hybrid coupling system can enter single-motor pure electric mode.

[0102] (4) Dual-motor pure electric first gear mode

[0103] The first clutch 6 is released, the second clutch 9 is released, the brake 5 is engaged, the engine 1 is not working, the first motor 2 and the second motor 3 are driven, so as to establish a dual-motor pure electric first gear mode;

[0104] Specifically, Figure 3 As shown, the power transmission route 1 in this driving mode is: first motor 2 -> sixth gear 141 -> seventh gear 142 -> input shaft 7, second gear 121 -> third gear 122, first intermediate shaft 8, ring gear 43 -> planetary carrier 42 -> differential 16 -> wheel 17;

[0105] The power transmission route 2 is: the second motor 3 -> the fourth gear 131 -> the fifth gear 132 , the second intermediate shaft 10 -> the first gear 11 -> the differential 16 -> the wheel 17 .

[0106] In the dual-motor pure electric first gear mode, the brake 5 brakes the sun gear 41, and the power of the first motor 2 is reduced in one stage through the sixth gear 141 and the seventh gear 142, and then transmitted to the first intermediate shaft 8 through the second gear 121 and the third gear 122, and then input into the planetary row 4 from the ring gear 43, and after the planetary row 4 is reduced in one stage, it is output from the planetary carrier 42, and the planetary carrier 42 and the output ring gear 161 of the differential 16 are used to achieve the main reduction, thereby achieving the multi-stage reduction of the output of the first motor 2, the power output of the second motor 3 is reduced in one stage through the fourth gear 131 and the fifth gear 132, and then the first gear 11 and the output ring gear 161 of the differential 16 are used to achieve the main reduction, thereby achieving the multi-stage reduction of the output of the second motor 3, and the power output of the first motor 2 and the second motor 3 is coupled through the output ring gear 161 of the differential 16 and output to the wheel 17.

[0107] When the power battery is fully charged and the vehicle speed requirement is full speed, the hybrid coupling system can enter the dual-motor pure electric first gear mode.

[0108] (5) Dual-motor pure electric second gear mode

[0109] The first clutch 6 is engaged, the second clutch 9 is disengaged, the brake 5 is released, the engine 1 is not operated, the first motor 2 and the second motor 3 are driven, so as to establish a dual-motor pure electric second gear mode;

[0110] Specifically, Figure 4 As shown, the power transmission route 1 in this driving mode is: first motor 2 -> sixth gear 141 -> seventh gear 142 -> input shaft 7, second gear 121 -> third gear 122, first intermediate shaft 8, planetary gear 4 -> differential 16 -> wheel 17;

[0111] The power transmission route 2 is: the second motor 3 -> the fourth gear 131 -> the fifth gear 132 , the second intermediate shaft 10 -> the first gear 11 -> the differential 16 -> the wheel 17 .

[0112] In the dual-motor pure electric second gear mode, the first clutch 6 is engaged, so that the planetary gear 4 is locked and rotates as a whole. The power output speed of the first motor 2 is lower than that of the dual-motor pure electric first gear mode, which is more suitable for high-speed cruising.

[0113] When the power battery is fully charged and the vehicle speed requirement is full vehicle speed, the hybrid coupling system can enter the dual-motor pure electric second gear mode.

[0114] In summary, by switching the working states of the first clutch 6 and the brake 5 and adjusting the speed ratio of the planetary gear set 4, two gears of the dual-motor pure electric mode can be realized, thereby achieving better power matching.

[0115] (6) Hybrid drive first gear mode

[0116] The first clutch 6 is released, the second clutch 9 is engaged, the brake 5 is engaged, the first motor 2 generates electricity and starts the engine 1, the engine 1 drives, and the second motor 3 drives to establish a hybrid drive first gear mode;

[0117] Specifically, Figure 5 As shown, the power transmission route 1 in this driving mode is: first motor 2 -> sixth gear 141 -> seventh gear 142 -> input shaft 7, second gear 121 -> third gear 122, first intermediate shaft 8, ring gear 43 -> planetary carrier 42 -> differential 16 -> wheel 17;

[0118] The power transmission route 2 is: engine 1 -> input shaft 7, second gear 121 -> third gear 122, first intermediate shaft 8, ring gear 43 -> planetary carrier 42 -> differential 16 -> wheel 17;

[0119] The power transmission route 3 is: the second motor 3 -> the fourth gear 131 -> the fifth gear 132 , the second intermediate shaft 10 -> the first gear 11 -> the differential 16 -> the wheel 17 .

[0120] In the hybrid drive first gear mode, the power of the engine 1 and the first motor 2 is coupled at the input shaft 7, and then input into the planetary row 4 from the ring gear 43 for deceleration, and then is mainly reduced in speed through the planetary carrier 42 and the output ring gear 161 of the differential 16. The power output of the second motor 3 is decelerated by the fourth gear 131 and the fifth gear 132, and then is mainly reduced in speed through the first gear 11 and the output ring gear 161 of the differential 16. The power output from the planetary carrier 42 and the power output from the second motor 3 are coupled at the output ring gear 161 of the differential 16, and the power of the three power sources is finally output through the differential 16.

[0121] At medium speeds, the hybrid coupling system can enter hybrid drive first gear mode.

[0122] (7) Hybrid drive second gear mode

[0123] The first clutch 6 is engaged, the second clutch 9 is engaged, the brake 5 is released, the first motor 2 generates electricity and starts the engine 1, the engine 1 drives, and the second motor 3 drives to establish a hybrid drive second gear mode;

[0124] Specifically, Figure 6 As shown, the power transmission route 1 in this driving mode is: first motor 2 -> sixth gear 141 -> seventh gear 142 -> input shaft 7, second gear 121 -> third gear 122, first intermediate shaft 8, planetary gear 4 -> differential 16 -> wheel 17;

[0125] The power transmission route 2 is: engine 1 -> input shaft 7, second gear 121 -> third gear 122, first intermediate shaft 8, planetary gear 4 -> differential 16 -> wheel 17;

[0126] The power transmission route 3 is: the second motor 3 -> the fourth gear 131 -> the fifth gear 132 , the second intermediate shaft 10 -> the first gear 11 -> the differential 16 -> the wheel 17 .

[0127] In the hybrid drive second gear mode, the power of the engine 1 and the first motor 2 is coupled at the input shaft 7, input into the planetary gear row 4 from the ring gear 43, and then is reduced in speed through the planetary carrier 42 and the output ring gear 161 of the differential 16. The power output of the second motor 3 is reduced in speed through the fourth gear 131 and the fifth gear 132, and then is reduced in speed through the first gear 11 and the output ring gear 161 of the differential 16. The power output from the planetary carrier 42 and the power output from the second motor 3 are coupled at the output ring gear 161 of the differential 16, and the power of the three power sources is finally output through the differential 16.

[0128] At high speeds, the hybrid coupling system can enter the hybrid drive second gear mode.

[0129] (8) Extended range mode

[0130] The first clutch 6 is released, the second clutch 9 is engaged, the brake 5 is released, the first motor 2 starts the engine 1, the engine 1 drives the first motor 2 to generate electricity, and the second motor 3 drives to establish the extended range mode;

[0131] Specifically, Figure 7 As shown, the power transmission route 1 in this driving mode is: engine 1 -> input shaft 7, seventh gear 142 -> sixth gear 141 -> first motor 2;

[0132] The power transmission route 2 is: the second motor 3 -> the fourth gear 131 -> the fifth gear 132 , the second intermediate shaft 10 -> the first gear 11 -> the differential 16 -> the wheel 17 .

[0133] When the power battery is low and the vehicle speed requirement is full speed, the hybrid coupling system can enter the extended range mode, using the engine 1 to drive the first motor 2 to generate electricity for the power battery, and then the power battery supplies power to the second motor 3.

[0134] Example 2

[0135] On the basis of the first embodiment, the second clutch 9 is omitted.

[0136] There is no dual-motor pure electric mode. Specifically, the hybrid coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, single motor pure electric mode, hybrid drive first gear mode, hybrid drive second gear mode and extended range mode;

[0137] The first clutch 6 is released, the brake 5 is engaged, the first motor 2 starts the engine 1, the engine 1 is driven, and the second motor 3 is not operated, so as to establish the engine direct drive first gear mode;

[0138] The first clutch 6 is engaged, the brake 5 is released, the first motor 2 starts the engine 1, the engine 1 is driven, and the second motor 3 is not operated, so as to establish the engine direct drive second gear mode;

[0139] The first clutch 6 is released, the brake 5 is released, the engine 1 and the first motor 2 are not operated, and the second motor 3 is driven to establish a single-motor pure electric mode;

[0140] The first clutch 6 is released, the brake 5 is engaged, the first motor 2 generates electricity and starts the engine 1, the engine 1 drives, and the second motor 3 drives to establish a hybrid drive first gear mode;

[0141] The first clutch 6 is engaged, the brake 5 is released, the first motor 2 generates electricity and starts the engine 1, the engine 1 drives, and the second motor 3 drives to establish a hybrid drive second gear mode;

[0142] The power transmission route of each mode is similar to the corresponding mode of Example 1, and the usage conditions are the same as the corresponding mode of Example 1, which will not be repeated here.

[0143] Example 3

[0144] On the basis of the first embodiment, the second motor 3 is eliminated.

[0145] There is no dual-motor pure electric mode and extended-range mode. Specifically, the hybrid coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, single-motor pure electric mode, hybrid drive first gear mode and hybrid drive second gear mode.

[0146] The first clutch 6 is released, the second clutch 9 is engaged, the brake 5 is engaged, the first motor 2 starts the engine 1, and the engine 1 is driven to establish the engine direct drive first gear mode;

[0147] The first clutch 6 is engaged, the second clutch 9 is engaged, the brake 5 is released, the first motor 2 starts the engine 1, and the engine 1 is driven to establish the engine direct drive second gear mode;

[0148] The first clutch 6 is released, the second clutch 9 is released, the brake 5 is released, the engine 1 and the first motor 2 are not operated, and the first motor 2 is driven to establish a single-motor pure electric mode;

[0149] The first clutch 6 is released, the second clutch 9 is engaged, the brake 5 is engaged, the first motor 2 drives and starts the engine 1, and the engine 1 is driven to establish a hybrid drive first gear mode;

[0150] The first clutch 6 is engaged, the second clutch 9 is engaged, the brake 5 is released, the first motor 2 drives and starts the engine 1, and the engine 1 is driven to establish a hybrid drive second gear mode.

[0151] The engine direct drive first gear mode, the engine direct drive second gear mode, the hybrid drive first gear mode and the hybrid drive second gear mode are similar to the corresponding modes of Example 1. Compared with Example 1, the power transmission route of the second motor 3 is omitted. The power transmission route of the single-motor pure electric mode is the same as the power route when the first motor 2 is driven in the aforementioned Example 1. The usage conditions are the same as the corresponding modes of Example 1, and will not be repeated here.

[0152] Example 4

[0153] On the basis of the second embodiment, the second motor 3 is eliminated.

[0154] There is no pure electric mode and extended range mode. Specifically, the hybrid coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, hybrid drive first gear mode and hybrid drive second gear mode:

[0155] The first clutch 6 is released, the brake 5 is engaged, the first motor 2 starts the engine 1, and the engine 1 is driven to establish the engine direct drive first gear mode;

[0156] The first clutch 6 is engaged, the brake 5 is released, the first motor 2 starts the engine 1, and the engine 1 is driven to establish the engine direct drive second gear mode;

[0157] The first clutch 6 is released, the brake 5 is engaged, the first motor 2 drives and starts the engine 1, and the engine 1 is driven to establish a hybrid drive first gear mode;

[0158] The first clutch 6 is engaged, the brake 5 is released, the first motor 2 drives and starts the engine 1, and the engine 1 drives to establish the hybrid drive second gear mode.

[0159] The engine direct drive first gear mode, the engine direct drive second gear mode, the hybrid drive first gear mode and the hybrid drive second gear mode are similar to the corresponding modes of Example 2. Compared with Example 2, the power transmission route of the second motor 3 is omitted, which will not be repeated here.

[0160] Among the embodiments 1-4, the solution of the preferred embodiment 4 has more working modes and can better match the power requirements of the vehicle.

[0161] The embodiment of the present invention also provides a vehicle, including the hybrid power coupling system described in any of the above embodiments. Of course, the vehicle also includes a controller and a power battery connected to the controller, and the engine 1, the first motor 2 and the second motor 3 (if provided) are connected to the controller and controlled by the controller.

[0162] By adopting the aforementioned hybrid power coupling system, the first motor 2 can generate electricity for the power battery under the drive of the engine 1, and the power battery can provide the first motor 2 and the second motor 3 with power to drive the wheels 17. The engine 1 can directly drive the wheels 17, switch the working states of the first clutch 6, the second clutch 9 (if provided) and the brake 5, and realize multiple driving modes to obtain higher transmission efficiency; the engine direct drive mode avoids the energy conversion of machine-electricity and electric-machine, and improves the transmission efficiency; the engine 1 and the first motor 2 and the second motor 3 share the reduction assembly, which has a simple and compact structure, reduces the number of parts, and is conducive to reducing the load, thereby further improving the power performance of the whole vehicle and reducing the production cost of the whole vehicle; the power battery effectively supplements the driving power required by the wheels 17, thereby more reasonably allocating the power of the internal combustion engine, keeping the working state of the internal combustion engine unaffected or less affected by the road conditions, and the internal combustion engine can always work in the set optimal state, and can also recover the kinetic energy during braking, greatly improving the fuel efficiency of the whole vehicle.

[0163] In one embodiment, the hybrid power coupling system can automatically switch between multiple driving modes according to the battery SOC value and the vehicle speed requirement. The control process of automatically switching between multiple driving modes includes the following steps:

[0164] S1. The controller determines the relationship between the battery SOC value and the first threshold, or determines the relationship between the battery SOC value and the first threshold and the relationship between the vehicle speed and the second threshold at the same time;

[0165] S2, the controller switches the working mode of the hybrid coupling system according to the judgment result of step S1;

[0166] S3. During braking, the controller controls the second motor 3 to generate a braking torque and generates an induced current in its winding to charge the power battery.

[0167] Among them, the first threshold is used to judge the battery SOC value, and the second threshold is used to judge the vehicle speed. This embodiment does not limit the value range of the first threshold and the second threshold, which can usually be freely set according to the specific control strategy. Under different control strategies, the values ​​of the first threshold and the second threshold are not exactly the same. After the first threshold and the second threshold are set in the controller, the controller automatically performs the judgment of step S1 and automatically switches between multiple driving modes according to the judgment result of step S1.

[0168] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hybrid power coupling system, comprising an engine, a first motor, a planetary gear, a brake, a first clutch, an input shaft and a first intermediate shaft, wherein the planetary gear comprises a sun gear, a planetary carrier and a ring gear, characterized in that: The engine and the first motor are both connected to the input shaft, and the input shaft is transmission-connected to the first intermediate shaft via a first gear pair; The sun gear is loosely sleeved on the first intermediate shaft, and the brake is used for braking the sun gear; The ring gear is fixed on the first intermediate shaft, any two structures among the sun gear, the planet carrier and the ring gear are connected via a first clutch, and the planet carrier is meshed with the output ring gear of the differential; The planetary gear is not coaxial with the engine or the first motor; The hybrid coupling system further includes a third gear pair, and the first motor is transmission-connected to the input shaft via the third gear pair; The third gear pair includes a sixth gear and a seventh gear, the sixth gear is coaxially connected to the first motor, the seventh gear is fixed on the input shaft, and the diameter of the seventh gear is greater than the diameter of the sixth gear.

2. The hybrid coupling system according to claim 1, characterized in that: A second clutch is also included, and the engine is connected to the input shaft via the second clutch.

3. The hybrid coupling system according to claim 1 or 2, characterized in that: It also includes a second motor, which is drivingly connected to the output ring gear of the differential.

4. The hybrid coupling system according to claim 3, characterized in that: It also includes a second gear pair, a second intermediate shaft and a first gear. The second motor is connected to the second intermediate shaft through the second gear pair. The first gear is fixed on the second intermediate shaft and meshes with the output ring gear of the differential.

5. The hybrid coupling system according to claim 4, characterized in that: The first gear pair includes a second gear and a third gear, the second gear is fixed on the input shaft, and the third gear is fixed on the first intermediate shaft; The second gear pair includes a fourth gear and a fifth gear, the fourth gear is coaxially connected to the second motor, the fifth gear is fixed on the second intermediate shaft, and the diameter of the fifth gear is greater than the diameter of the fourth gear.

6. The hybrid coupling system according to claim 1, characterized in that: The hybrid power coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, hybrid drive first gear mode and hybrid drive second gear mode: The first clutch is released, the brake is engaged, the first motor starts the engine, and the engine is driven to establish a direct drive first gear mode of the engine; The first clutch is engaged, the brake is released, the first motor starts the engine, and the engine is driven to establish a direct-drive second-gear mode of the engine; The first clutch is released, the brake is engaged, the first motor drives and starts the engine, and the engine is driven to establish the hybrid drive first gear mode; The first clutch is engaged, the brake is released, the first motor drives and starts the engine, and the engine is driven to establish the hybrid drive second gear mode.

7. The hybrid coupling system according to claim 2, characterized in that: The hybrid power coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, single motor pure electric mode, hybrid drive first gear mode and hybrid drive second gear mode: The first clutch is released, the second clutch is engaged, the brake is engaged, the first motor starts the engine, and the engine is driven to establish a direct drive first gear mode of the engine; The first clutch is engaged, the second clutch is engaged, the brake is released, the first motor starts the engine, and the engine is driven to establish a direct drive second gear mode of the engine; The first clutch is released, the second clutch is released, the brake is released, the engine and the first motor are not operated, and the first motor is driven to establish the single-motor pure electric mode; The first clutch is released, the second clutch is engaged, the brake is engaged, the first motor drives and starts the engine, and the engine is driven to establish the hybrid drive first gear mode; The first clutch is engaged, the second clutch is engaged, the brake is released, the first motor drives and starts the engine, and the engine drives to establish the hybrid drive second gear mode.

8. The hybrid coupling system according to claim 2, characterized in that: It also includes a second motor, which is drivingly connected to the output ring gear of the differential; When the second clutch is not present, the hybrid coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, single motor pure electric mode, hybrid drive first gear mode, hybrid drive second gear mode and range extension mode: The first clutch is released, the brake is engaged, the first motor starts the engine, the engine is driven, and the second motor is not operated, so as to establish a direct drive first gear mode of the engine; The first clutch is engaged, the brake is released, the first motor starts the engine, the engine is driven, and the second motor is not operated, so as to establish a direct drive second gear mode of the engine; The first clutch is released, the brake is released, the engine and the first motor are not operated, and the second motor is driven, so as to establish the single-motor pure electric mode; The first clutch is released, the brake is engaged, the first motor generates electricity and starts the engine, the engine drives, and the second motor drives, so as to establish the hybrid drive first gear mode; The first clutch is engaged, the brake is released, the first motor generates electricity and starts the engine, the engine is driven, and the second motor is driven to establish the hybrid drive second gear mode; The first clutch is released, the brake is released, the first motor starts the engine, the engine drives the first motor to generate electricity, and the second motor drives, so as to establish the extended range mode; When the second clutch is provided, the hybrid coupling system has the following engine direct drive first gear mode, engine direct drive second gear mode, single motor pure electric mode, dual motor pure electric first gear mode, dual motor pure electric second gear mode, hybrid drive first gear mode, hybrid drive second gear mode and range extension mode: The first clutch is released, the second clutch is engaged, the brake is engaged, the first motor starts the engine, the engine is driven, and the second motor is not operated, so as to establish a direct drive first gear mode of the engine; The first clutch is engaged, the second clutch is engaged, the brake is released, the first motor starts the engine, the engine is driven, and the second motor is not operated, so as to establish a direct drive second gear mode of the engine; The first clutch is released, the second clutch is released, the brake is released, the engine and the first motor are not operated, and the second motor is driven, so as to establish the single-motor pure electric mode; The first clutch is released, the second clutch is released, the brake is engaged, the engine is not operated, and the first motor and the second motor are driven to establish the dual-motor pure electric first gear mode; The first clutch is engaged, the second clutch is disengaged, the brake is disengaged, the engine is not operated, and the first motor and the second motor are driven to establish the dual-motor pure electric second gear mode; The first clutch is released, the second clutch is engaged, the brake is engaged, the first motor generates electricity and starts the engine, the engine drives, and the second motor drives, so as to establish the hybrid drive first gear mode; The first clutch is engaged, the second clutch is engaged, the brake is released, the first motor generates electricity and starts the engine, the engine drives, and the second motor drives, so as to establish the hybrid drive second gear mode; The first clutch is released, the second clutch is engaged, the brake is released, the first motor starts the engine, the engine drives the first motor to generate electricity, and the second motor drives to establish the extended-range mode.

9. A vehicle, characterized in that: A hybrid power coupling system comprising the hybrid power coupling system according to any one of claims 1 to 8.

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