Hybrid Power Coupling System and Vehicle

Abstract

The hybrid power coupling system and vehicle of the present invention include an engine, a generator, a drive motor, a first planetary gear set, a second planetary gear set, a brake, a first clutch, a second clutch, an input shaft, and an intermediate shaft for outputting power to the wheels. The first planetary gear set includes a first sun gear, a first planet carrier, and a first ring gear. The second planetary gear set includes a second sun gear, a second planet carrier connected to the first ring gear, and a second ring gear connected to the first planet carrier. The engine is connected to the input shaft. The input shaft is connected to the first sun gear and the second planet carrier through the first clutch and the second clutch respectively. The brake is used to brake the first sun gear. The first planet carrier meshes with a first gear provided on the intermediate shaft. The generator is connected to the second sun gear or the input shaft. The drive motor is connected to the intermediate shaft. It is beneficial to reduce the system load, can achieve multiple driving modes, has higher transmission efficiency, and improves the power performance and economy of the whole vehicle.

Description

Technical Field

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

[0002] The power system includes an engine (internal combustion engine) and a transmission system composed of a transmission, a differential, and a drive shaft; its function is to provide the driving power required by the vehicle's drive wheels. The internal combustion engine has a certain speed and torque range, and reaches the best working state within a very small range of them, at this time, either the fuel consumption is the smallest, or the harmful emissions are the lowest, or both. However, the actual road conditions vary widely, not only in the speed of the drive wheels, but also in the torque required by the drive wheels. Therefore, the primary task of the transmission is to achieve the optimal rotation speed and torque of the internal combustion engine, that is, the optimal power state, and to match it well with the power state of the drive wheels.

[0003] At present, the transmissions on the market are mainly divided into two categories: stepped transmissions and continuously variable transmissions. Stepped transmissions are further subdivided into manual and automatic types. Most of them provide a limited number of discrete input-output 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 is achieved by changing the speed of the internal combustion engine. Continuously variable transmissions, whether mechanical, hydraulic, or electro-mechanical, can provide an infinite number of continuously selectable speed ratios within a certain speed range. Theoretically, the speed change of the drive wheels can be completely achieved 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 the ability to make full use of the maximum power of the internal combustion engine. Therefore, continuously variable transmissions have been the object of research by engineers in various countries for many years.

[0004] In recent years, the birth of motor hybrid technology has opened up a new way to achieve a perfect match between the power of the internal combustion engine and the power wheels. Among many powertrain design cases, the most representative ones 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 wheels 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 combination with an energy storage device, such as a battery, a capacitor, etc., this 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 and independent power chains. One is composed of a traditional mechanical transmission, and the other is composed of a motor - battery system. The mechanical transmission is responsible for adjusting the speed, while the motor - battery system adjusts the power or torque. To give full play to the potential of the entire system, the mechanical transmission also needs to adopt a continuously variable transmission method.

[0006] The advantages of a series hybrid system are its simple structure and flexible layout. However, since all power passes through the generator and the motor, the motor requires a high power, is large in size, and heavy in weight. At the same time, due to the energy transmission process going through two conversions of machine - electricity and electricity - machine, the efficiency of the entire system is relatively low. In a 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 has high efficiency. However, this system requires two sets of independent subsystems, resulting in a high cost. It is usually only used in weak hybrid systems.

[0007] An existing power coupling system includes two motors, a compound planetary gear set composed of a first planetary gear set and a second planetary gear set. The first planetary gear set includes a first sun gear and a first planetary carrier, the second planetary gear set includes a second sun gear and a second planetary carrier. The first planetary gear set and the second planetary gear set share a ring gear. The first sun gear is connected to a generator, the first planetary carrier is connected to an engine, the ring gear is connected to a differential, the second sun gear is connected to a drive motor, and the second planetary carrier is connected to a brake. Although this solution can achieve working modes such as pure electric drive and hybrid drive by reasonably controlling relevant power sources, it cannot achieve the engine direct drive mode. For a power split system, the E - CVT mode only has high system efficiency and good economy at medium and low speeds; for medium and high speeds, the system efficiency of the engine direct drive mode is high and the economy is good. Therefore, an existing solution that cannot achieve the engine direct drive mode will inevitably lead to insufficient power performance and economy. Summary of the Invention

[0008] The technical problem to be solved by the present invention is: aiming at the problem of insufficient power performance and economy of the existing power coupling system, to provide a hybrid power coupling system and a vehicle.

[0009] To solve the above - mentioned technical problem, an embodiment of the present invention provides a hybrid power coupling system, which includes an engine, a generator, a drive motor, a first planetary gear set, a second planetary gear set, a brake, a first clutch, a second clutch, an input shaft, and an intermediate shaft; the first planetary gear set includes a first sun gear, a first planetary carrier, and a first ring gear, the second planetary gear set includes a second sun gear, a second planetary carrier, and a second ring gear, the first planetary carrier is connected to the second ring gear, and the first ring gear is connected to the second planetary carrier;

[0010] The engine is connected to the input shaft;

[0011] The input shaft is connected to the first sun gear through the first clutch, and the input shaft is connected to the second planetary carrier through the second clutch;

[0012] The brake is used to brake the first sun gear, and the first planetary carrier meshes with a first gear fixedly arranged on the intermediate shaft;

[0013] The generator is connected to the second sun gear and / or the input shaft;

[0014] The drive motor is connected to the intermediate shaft;

[0015] The intermediate shaft outputs power to the wheels.

[0016] Optionally, a third clutch is further included, and the generator is connected to the input shaft through the third clutch.

[0017] Optionally, the housing of the third clutch connects the rotating shaft of the generator and the second sun gear.

[0018] Optionally, the first sun gear and the second sun gear are rotatably arranged on the input shaft.

[0019] Optionally, the first clutch and the second clutch are integrated into a dual clutch with a common clutch housing. The dual clutch is located between the first sun gear and the second sun gear, and the clutch housing is arranged on the input shaft.

[0020] Optionally, a first reduction gear pair is further included, and the drive motor is connected to the intermediate shaft through the first reduction gear pair.

[0021] Optionally, the engine and the generator are coaxially arranged and are respectively located at two ends of the input shaft;

[0022] The first reduction gear pair includes a third gear and a fourth gear that mesh with each other. The third gear is fixedly arranged on the rotating shaft of the drive motor, the fourth gear is fixedly arranged at one end of the intermediate shaft, and the first gear is fixedly arranged at the other end of the intermediate shaft; or

[0023] The first reduction gear pair includes the first gear and the third gear. The third gear is fixedly arranged on the rotating shaft of the drive motor and meshes with the first gear.

[0024] Optionally, when the generator is connected to the second sun gear: the hybrid power coupling system has a single-motor pure electric mode, a dual-motor pure electric mode, a second hybrid drive mode, a third hybrid drive mode, a second engine direct drive mode, a third engine direct drive mode, a first ECVT mode, and a second ECVT mode;

[0025] Disengage the first clutch, disengage the second clutch, disengage the brake, and the engine and the generator do not work. The drive motor drives to establish the single-motor pure electric mode;

[0026] Disengage the first clutch, disengage the second clutch, engage the brake, with the engine not working, and the generator and the drive motor driving together to establish the dual-motor pure electric mode;

[0027] Disengage the first clutch, engage the second clutch, engage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the second hybrid drive mode;

[0028] Engage the first clutch, engage the second clutch, disengage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the third hybrid drive mode;

[0029] Disengage the first clutch, engage the second clutch, engage the brake, with the engine driving, and the generator and the drive motor not working to establish the second engine direct drive mode;

[0030] Engage the first clutch, engage the second clutch, disengage the brake, with the engine driving, and the generator and the drive motor not working to establish the third engine direct drive mode;

[0031] Disengage the first clutch, engage the second clutch, disengage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the first ECVT mode;

[0032] Engage the first clutch, disengage the second clutch, disengage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the second ECVT mode.

[0033] Optionally, when the generator is connected to the input shaft: the hybrid power coupling system has a single-motor pure electric mode, a first dual-motor pure electric mode, a second dual-motor pure electric mode, a second hybrid drive mode, a third hybrid drive mode, a second engine direct drive mode, a third engine direct drive mode, and an extended range mode;

[0034] Disengage the first clutch, disengage the second clutch, disengage the brake, with the engine and the generator not working, and the drive motor driving to establish the single-motor pure electric mode;

[0035] Disengage the first clutch, engage the second clutch, engage the brake, with the engine not working, and the generator and the drive motor driving together to establish the first dual-motor pure electric mode;

[0036] Engage the first clutch, engage the second clutch, disengage the brake, with the engine not working, and the generator and the drive motor driving together to establish the second dual-motor pure electric mode;

[0037] Disengage the first clutch, engage the second clutch, engage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the second hybrid drive mode;

[0038] Engage the first clutch, engage the second clutch, disengage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the third hybrid drive mode;

[0039] Disengage the first clutch, engage the second clutch, engage the brake, with the engine driving and the generator and the drive motor not working to establish the second engine direct drive mode;

[0040] Engage the first clutch, engage the second clutch, disengage the brake, with the engine driving and the generator and the drive motor not working to establish the third engine direct drive mode;

[0041] Disengage the first clutch, disengage the second clutch, disengage the brake, with the engine driving the generator to generate electricity and the drive motor driving to establish the range extender mode.

[0042] Optionally, when the generator is connected to the input shaft through the third clutch, and the housing of the third clutch connects the rotating shaft of the generator and the second sun gear, the hybrid power coupling system has a single-motor pure electric mode, a dual-motor pure electric mode, a first hybrid drive mode, a second hybrid drive mode, a third hybrid drive mode, a first engine direct drive mode, a second engine direct drive mode, a third engine direct drive mode, a first ECVT mode, a second ECVT mode, and a range extender mode;

[0043] Disengage the first clutch, disengage the second clutch, disengage the third clutch, disengage the brake, with the engine and the generator not working and the drive motor driving to establish the single-motor pure electric mode;

[0044] Disengage the first clutch, disengage the second clutch, disengage the third clutch, engage the brake, with the engine not working, and the generator and the drive motor driving together to establish the dual-motor pure electric mode;

[0045] Disengage the first clutch, disengage the second clutch, engage the third clutch, engage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the first hybrid drive mode;

[0046] Disengage the first clutch, engage the second clutch, disengage the third clutch, engage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the second hybrid drive mode;

[0047] Engage the first clutch, engage the second clutch, disengage the third clutch, disengage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the third hybrid drive mode;

[0048] Disengage the first clutch, disengage the second clutch, engage the third clutch, engage the brake, with the engine driving, and the generator and the drive motor not working to establish the first engine direct drive mode;

[0049] Disengage the first clutch, engage the second clutch, disengage the third clutch, engage the brake, with the engine driving, and the generator and the drive motor not working to establish the second engine direct drive mode;

[0050] Engage the first clutch, engage the second clutch, disengage the third clutch, disengage the brake, with the engine driving, and the generator and the drive motor not working to establish the third engine direct drive mode;

[0051] Disengage the first clutch, engage the second clutch, disengage the third clutch, disengage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the first ECVT mode;

[0052] Engage the first clutch, disengage the second clutch, disengage the third clutch, disengage the brake, with the engine driving, the generator driving or generating electricity under the drive of the engine, and the drive motor assisting in driving to establish the second ECVT mode;

[0053] Disengage the first clutch, disengage the second clutch, engage the third clutch, disengage the brake, the engine drives the generator to generate electricity, and the drive motor drives to establish the range extender mode.

[0054] An embodiment of the present invention provides a vehicle, including a controller and a battery connected to the controller; further including the aforementioned hybrid power coupling system, the engine, the generator and the drive motor are connected to the controller and controlled by the controller.

[0055] The hybrid power coupling system and the vehicle provided by the embodiments of the present invention are provided with a CR-CR compound planetary gear set (i.e., the first planetary gear set and the second planetary gear set). By controlling the working states (engagement or disengagement) of the brake, the first clutch and the second clutch, the two-speed ratio switching of the compound planetary gear set can be realized, so that the engine has two gears when driving the wheels, the generator has one gear when driving the wheels, the engine and the generator have two gears when jointly driving the wheels, the engine can also drive the generator to generate electricity, and can also drive the wheels through the drive motor, and can realize multiple drive modes, significantly improving the power performance of the whole vehicle and the fuel economy of the vehicle;

[0056] The engine and the generator share the CR-CR compound planetary gear set for speed change, with a simple and compact structure, reducing the number of parts, being beneficial to reducing the system load, improving the power performance of the whole vehicle, being beneficial to reducing the volume, and reducing the cost of the reduction component;

[0057] When the engine is connected to the second sun gear, the engine and the generator are connected through the CR-CR compound planetary gear set, and the speed ratio range is large and adjustable, which is beneficial to reducing the volume of the generator;

[0058] In the hybrid drive mode, speed regulation can be performed through the CR-CR compound planetary gear set to optimize the working range of the engine and improve the fuel economy of the vehicle;

[0059] In the hybrid drive mode, the dual-motor pure electric mode, the single-motor pure electric mode and the range extender mode, the drive motor participates in driving to avoid power interruption;

[0060] The dual-motor pure electric mode can be realized, which is beneficial to reducing the sizes of the generator and the drive motor and reducing the cost;

[0061] The hybrid power coupling system effectively supplements the driving power required by the wheels through the power battery, thereby more reasonably allocating the power of the internal combustion engine and keeping the working state of the internal combustion engine unaffected or less affected by road conditions. The internal combustion engine can always work in the set optimal state to improve the fuel efficiency of the whole vehicle. Description of the Drawings

[0062] Figure 1Schematic diagram of the hybrid power coupling system provided by the embodiments of the present invention;

[0063] Figure 2 For Figure 1 Power transmission route diagram of the hybrid power coupling system shown in the single-motor pure electric mode;

[0064] Figure 3 For Figure 1 Power transmission route diagram of the hybrid power coupling system shown in the dual-motor pure electric mode;

[0065] Figure 4 For Figure 1 Power transmission route diagram of the hybrid power coupling system shown in the first hybrid drive mode;

[0066] Figure 5 For Figure 1 Collinearity diagram of the hybrid power coupling system shown in the first hybrid drive mode;

[0067] Figure 6 For Figure 1 Power transmission route diagram of the hybrid power coupling system shown in the second hybrid drive mode;

[0068] Figure 7 For Figure 1 Collinearity diagram of the hybrid power coupling system shown in the second hybrid drive mode;

[0069] Figure 8 For Figure 1 Power transmission route diagram of the hybrid power coupling system shown in the third hybrid drive mode;

[0070] Figure 9 For Figure 1 Collinearity diagram of the hybrid power coupling system shown in the third hybrid drive mode;

[0071] Figure 10 For Figure 1 Power transmission route diagram of the hybrid power coupling system shown in the first ECVT mode;

[0072] Figure 11 For Figure 1 Collinearity diagram of the hybrid power coupling system shown in the first ECVT mode;

[0073] Figure 12 For Figure 1 Power transmission route diagram of the hybrid power coupling system shown in the second ECVT mode;

[0074] Figure 13 For Figure 1 Collinearity diagram of the hybrid power coupling system shown in the second ECVT mode;

[0075] Figure 14 is Figure 1 the power transmission route diagram of the hybrid coupling system shown in the range extender mode;

[0076] The reference numerals in the specification are as follows:

[0077] 1. Engine; 2. Generator; 3. Drive motor;

[0078] 4. First planetary gear set; 41. First sun gear; 43. First planet carrier; 44. First ring gear;

[0079] 5. Second planetary gear set; 51. Second sun gear; 53. Second planet carrier; 54. Second ring gear;

[0080] 6. First clutch; 7. Second clutch; 8. Third clutch; 9. Brake;

[0081] 10. Input shaft; 11. Intermediate shaft;

[0082] 12. Main reduction gear pair; 121. First gear; 122. Second gear;

[0083] 13. First reduction gear pair; 131. Third gear; 132. Fourth gear;

[0084] 14. Differential; 15. Wheel. Detailed implementation manners

[0085] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to 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.

[0086] As Figure 1 shown, the hybrid coupling system provided by the embodiment of the present invention includes an engine 1, a generator 2, a drive motor 3, a first planetary gear set 4, a second planetary gear set 5, a brake 9, a first clutch 6, a second clutch 7, an input shaft 10 and an intermediate shaft 11; the first planetary gear set 4 includes a first sun gear 41, a first planet carrier 43 and a first ring gear 44, the second planetary gear set 5 includes a second sun gear 51, a second planet carrier 53 and a second ring gear 54, the first planet carrier 43 is connected to the second ring gear 54, and the first ring gear 44 is connected to the second planet carrier 53;

[0087] The engine 1 is connected to the input shaft 10;

[0088] The input shaft 10 is connected to the first sun gear 41 through the first clutch 6, and the input shaft 10 is connected to the second planet carrier 53 through the second clutch 7;

[0089] The brake 9 is used to brake the first sun gear 41, and the first planet carrier 43 meshes with the first gear 121 fixedly arranged on the intermediate shaft 11;

[0090] The generator 2 is connected to the second sun gear 51 and / or the input shaft 10;

[0091] The drive motor 3 is connected to the intermediate shaft 11;

[0092] The intermediate shaft 11 outputs power to the wheel 15.

[0093] Wherein, the overall structure formed by connecting the first planetary gear set 4 and the second planetary gear set 5 is the CR-CR compound planetary gear set.

[0094] First, when the generator 2 is connected to the second sun gear 51:

[0095] During use, disengage the first clutch 6, engage the second clutch 7, and engage the brake 9. The power of the engine 1 is transmitted to the input shaft 10, and then input into the CR-CR compound planetary gear set from the second planet carrier 53. After being decelerated by the CR-CR compound planetary gear set, it is output from the first planet carrier 43; or engage the first clutch 6, engage the second clutch 7, and disengage the brake 9. The CR-CR compound planetary gear set is locked to the input shaft 10, and the speed ratio of the entire CR-CR compound planetary gear set is 1. The power of the engine 1 is transmitted to the input shaft 10, then input into the CR-CR compound planetary gear set, and then the power is output by the overall rotation of the compound planetary gear set; the power of the engine 1 is transmitted to the wheel 15 through any one of the above two paths, so as to realize two gears of the engine 1 directly driving the wheel 15.

[0096] When the first clutch 6 is disengaged, the second clutch 7 is disengaged, and the brake 9 is disengaged, or the first clutch 6 is disengaged, the second clutch 7 is engaged, and the brake 9 is engaged, or the first clutch 6 is engaged, the second clutch 7 is engaged, and the brake 9 is disengaged, the power of the generator 2 is input into the CR-CR compound planetary gear set from the second sun gear 51. After being decelerated or not decelerated by the CR-CR compound planetary gear set, it is output from the first planet carrier 43, so as to realize the generator 2 driving the wheel 15;

[0097] The power of the drive motor 3 can be output to the wheel 15 through the intermediate shaft 11, so as to realize the drive motor 3 directly driving the wheel 15;

[0098] The power of the engine 1 can be transmitted to the input shaft 10, and the power of the input shaft 10 can be transmitted to the generator 2 through the CR-CR compound planetary gear set, so as to drive the generator 2 to generate electricity;

[0099] When the engine 1 or the generator 2, and the drive motor 3 jointly participate in driving, the intermediate shaft 11 plays a role in coupling power and transmits the coupled power to the wheel 15;

[0100] When the engine 1 and the generator 2 jointly participate in driving, the CR-CR compound planetary gear set plays a role in coupling power and transmits the coupled power to the wheel 15.

[0101] Secondly, when the generator 2 is connected to the input shaft 10:

[0102] During use, the first clutch 6 is disengaged, the second clutch 7 is engaged, and the brake 9 is engaged. The power of the engine 1 (or the generator 2) is transmitted to the input shaft 10, and then input into the CR-CR compound planetary gear set through the second planet carrier 53. After being decelerated by the CR-CR compound planetary gear set, it is output from the first planet carrier 43; or the first clutch 6 is engaged, the second clutch 7 is engaged, and the brake 9 is disengaged. The CR-CR compound planetary gear set is locked to the input shaft 10, and the speed ratio of the entire CR-CR compound planetary gear set is 1. The power of the engine 1 (or the generator 2) is transmitted to the input shaft 10, then input into the CR-CR compound planetary gear set, and then the power is output by the overall rotation of the compound planetary gear set; the power of the engine 1 (or the generator 2) is transmitted to the wheel 15 through any one of the above two paths, thereby realizing two gears for the engine 1 (or the generator 2) to directly drive the wheel 15.

[0103] The power of the drive motor 3 can be output to the wheel 15 through the intermediate shaft 11, thereby realizing that the drive motor 3 directly drives the wheel 15;

[0104] The power of the engine 1 can be transmitted to the input shaft 10, and the power of the input shaft 10 is transmitted to the generator 2, thereby driving the generator 2 to generate electricity;

[0105] When the engine 1 or the generator 2, and the drive motor 3 jointly participate in driving, the intermediate shaft 11 plays a role in coupling power and transmits the coupled power to the wheel 15;

[0106] When the engine 1 and the generator 2 jointly participate in driving, the input shaft 10 plays a role in coupling power and transmits the coupled power to the wheel 15.

[0107] The hybrid power coupling system provided by the embodiment of the present invention is provided with a CR-CR compound planetary gear set. By controlling the working states (engagement or disengagement) of the brake 9, the first clutch 6, and the second clutch 7, two-speed ratio switching of the compound planetary gear set can be realized, so that the engine 1 has two gears when driving the wheel 15, the generator 2 has one gear when driving the wheel 15, the engine 1 and the generator 2 have two gears when jointly driving the wheel 15, the engine 1 can also drive the generator 2 to generate electricity, and can also drive the wheel 15 through the drive motor 3, realizing multiple driving modes, significantly improving the power performance of the whole vehicle, and improving vehicle economy;

[0108] The engine 1 and the generator 2 share a CR-CR compound planetary gear set for speed change, featuring a simple and compact structure, reducing the number of parts, facilitating the reduction of system load, enhancing the vehicle's power performance, reducing volume, and lowering the cost of the reduction components;

[0109] When the engine 1 is connected to the second sun gear 51, the engine 1 and the generator 2 are connected through the CR-CR compound planetary gear set, with a large and adjustable speed ratio range, which is beneficial for reducing the volume of the generator 2;

[0110] In the hybrid drive mode, speed regulation can be achieved through the CR-CR compound planetary gear set to optimize the working range of the engine 1 and improve vehicle economy;

[0111] In the hybrid drive mode, dual-motor pure electric mode, single-motor pure electric mode, and range-extending mode, the drive motor 3 is involved in driving to avoid power interruption;

[0112] The ability to achieve the dual-motor pure electric mode is beneficial for reducing the sizes of the generator 2 and the drive motor 3 and lowering costs.

[0113] Among them, the generator 2 is an electric / generator (M / G) and can be used for power generation and driving.

[0114] Specifically, the generator 2 also serves as a starting motor to start the engine 1. If the generator 2 is not driving or generating power and the engine 1 is driving, the generator 2 starts the engine 1 and then stops working; if the generator 2 is driving or generating power and the engine 1 is driving, the generator 2 starts the engine 1 and then remains in the working state.

[0115] To simplify the structure and increase stability, it is preferred that the first planet carrier 43 and the second ring gear 54 are of an integral structure, and the first ring gear 44 and the second planet carrier 53 are of an integral structure.

[0116] Preferably, the rotational speed of the first planet carrier 43 is greater than that of the first gear 121, which is equivalent to the first planet carrier 43 and the first gear 121 forming a first-stage reduction gear pair to achieve the reduction output of the engine or the generator 2, simplifying the structure.

[0117] In addition, as Figure 1 shown, the hybrid power coupling system further includes a differential 14. The first gear 121 is connected to the differential 14 (or the intermediate shaft 11 is connected to the differential 14, and the first gear 121 transmits power to the intermediate shaft 11, and then the power is transmitted to the differential 14 through the intermediate shaft 11, which is not shown in the figure). The differential 14 drives the wheels 15. Preferably, the hybrid power coupling system further includes a main reduction gear pair 12. The intermediate shaft 11 is connected to the differential 14 through the main reduction gear pair 12 for speed reduction, and the first gear 121 can be a component of the main reduction gear pair 12.

[0118] In one embodiment, as Figure 1 shown, it further includes a third clutch 8. The generator 2 is connected to the input shaft 10 through the third clutch 8 (the solutions where the generator 2 is only connected to the second sun gear 51 or only connected to the input shaft 10 are not shown). By controlling the engagement and disengagement of the third clutch 8, the control of whether the generator 2 operates is achieved; when it is necessary for the generator 2 to drive the wheels 15 or generate electricity under the drive of the engine 1, the third clutch 8 can be engaged. When the generator 2 is not required to work, the third clutch 8 is disengaged to reduce the system load and protect the generator 2.

[0119] Preferably, as Figure 1 shown, the housing of the third clutch 8 is connected to the second sun gear 51 and the rotating shaft of the generator 2.

[0120] In this way, the third clutch 8 not only plays the role of connecting the input shaft 10 and the generator 2, but also plays the role of connecting the input shaft 10 and the second sun gear 51, adding a gear for the engine 1 to drive the wheels 15, so that both the hybrid drive mode and the engine direct drive mode have three gears. At the same time, it also has the ECVT mode and the range extender mode, with multiple modes and gears, higher system efficiency and better economy.

[0121] In one embodiment, as Figure 1 shown, the first sun gear 41 and the second sun gear 51 are rotatably arranged on the input shaft 10, which is beneficial to improving the structural stability and transmission smoothness of the compound planetary gear set.

[0122] In one embodiment, as Figure 1 shown, the first clutch 6 and the second clutch 7 are integrated into a dual clutch with a common clutch housing. The dual clutch is located between the first sun gear 41 and the second sun gear 51, and the clutch housing is arranged on the input shaft 10. The structure is simpler and more compact, which is beneficial to the miniaturization of the hybrid power coupling system and reducing the system load.

[0123] In one embodiment, as Figure 1 shown, it further includes a first reduction gear pair 13. The drive motor 3 is connected to the intermediate shaft 11 through the first reduction gear pair 13. The drive motor 3 transmits power to the differential 14 after being decelerated by the first reduction gear pair 13, achieving better power matching.

[0124] In one embodiment, as Figure 1 shown, the first reduction gear pair 13 includes a third gear 131 and a fourth gear 132 that mesh with each other. The third gear 131 is fixedly arranged on the rotating shaft of the drive motor 3, the fourth gear 132 is fixedly arranged at one end of the intermediate shaft 11, and the first gear 121 is fixedly arranged at the other end of the intermediate shaft 11;

[0125] The structure is simple. At this time, the first gear 121 serves as an output component and outputs power to the wheel 15. Specifically, the first gear 121 can mesh with the second gear 122 provided on the differential 14. Thus, the first gear 121 and the second gear 122 form the main reduction gear pair 12 (as Figure 1 shown), ensuring that the drive motor 3 outputs power to the differential 14 after two-stage reduction (realized by the first reduction gear pair 13 and the main reduction gear pair 12), and the engine 1 or the generator 2 undergoes at least one-stage reduction (realized by the main reduction gear pair 12) to achieve better power matching.

[0126] In another embodiment (not shown), the first reduction gear pair includes a first gear and a third gear that mesh with each other, and the third gear is fixedly provided on the rotating shaft of the drive motor 3;

[0127] The structure is simple. At this time, the intermediate shaft serves as an output component and outputs power to the wheel 15. Specifically, one gear of the main reduction gear pair can be fixedly provided on the intermediate shaft 11, and the other gear is provided on the differential 14, ensuring that the drive motor 3 outputs power to the differential 14 after two-stage reduction (realized by the first reduction gear pair and the main reduction gear pair), and the engine 1 or the generator 2 undergoes at least one-stage reduction (realized by the main reduction gear pair) to achieve better power matching.

[0128] In one embodiment, as Figure 1 shown, the engine 1 and the generator 2 are coaxially arranged and are respectively located at both ends of the input shaft 10; the structure is simpler and more compact, which is beneficial to reducing the system load and increasing the transmission smoothness of the CR-CR compound planetary gear train.

[0129] In one embodiment (not shown), when the generator 2 is connected to the input shaft 10 and not connected to the second sun gear 51, the input shaft 10 is connected to the generator 2 through a speed increasing gear pair. From the input shaft 10 to the generator 2, after one-stage gear (speed increasing gear pair) speed increase and torque reduction, the volume of the generator 2 can be effectively reduced. When the generator 2 participates in driving, from the generator 2 to the input shaft 10, speed reduction and torque increase are achieved through the speed increasing gear pair.

[0130] Preferably, the speed increasing gear pair includes a fifth gear provided on the input shaft 10 and a sixth gear provided on the rotating shaft of the generator 2, and the fifth gear meshes with the sixth gear; the structure is simple and compact, which is beneficial to reducing the system load and ensuring the transmission smoothness.

[0131] The following describes the preferred embodiments related to the control of the brake 9 and the clutches (generally referring to the first clutch 6, the second clutch 7, and the third clutch 8):

[0132] Embodiment 1

[0133] As Figures 1 to 14, when the generator 2 is connected to the input shaft 10 through the third clutch 8, and the housing of the third clutch 8 connects the rotating shaft of the generator 2 and the second sun gear 51, the hybrid power coupling system has six working modes, namely, single-motor pure electric mode, dual-motor pure electric drive mode, hybrid drive mode (with three gears: the first hybrid drive mode, the second hybrid drive mode, and the third hybrid drive mode), engine direct drive mode (with three gears: the first engine direct drive mode, the second engine direct drive mode, and the third engine direct drive mode), ECVT mode (with two gears: the first ECVT mode and the second ECVT mode), and range extender mode;

[0134] Among them, the above six working modes are reflected in Table 1.

[0135] Table 1

[0136]

[0137] For each of the following modes, combined with Figures 2 to 14 the power transmission route of the hybrid power coupling system is described, where Figure 5 , Figure 7 , Figure 9 , Figure 11 and Figure 13 in, S 1 represents the first sun gear 41, S 2 represents the second sun gear 51, C 1 represents the first planet carrier 43, C 2 represents the second planet carrier 53, R 1 represents the first ring gear 44, R 2 represents the second ring gear 54, E 1 represents the generator 2, ICE represents the engine 1, and OUT represents the output;

[0138] (1) Single-motor pure electric mode

[0139] Disengage the first clutch 6, disengage the second clutch 7, disengage the third clutch 8, disengage the brake 9, the engine 1 and the generator 2 do not work, and the drive motor 3 drives to establish the single-motor pure electric mode;

[0140] Specifically, as Figure 2 shown, the power transmission route in this drive mode is: drive motor 3 -> third gear 131 -> fourth gear 132, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15.

[0141] When the power battery has sufficient power, the hybrid power coupling system can enter the single-motor pure electric mode, which is suitable for the full vehicle speed.

[0142] (2) Dual-motor pure electric drive mode

[0143] Disengage the first clutch 6, disengage the second clutch 7, disengage the third clutch 8, engage the brake 9, the engine 1 is not working, the generator 2 and the drive motor 3 drive together to establish a dual-motor pure electric mode;

[0144] Specifically, as Figure 3 shown, the power transmission route 1 in this drive mode is: generator 2 -> second sun gear 51 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15,

[0145] The power transmission route 2 is: drive motor 3 -> third gear 131 -> fourth gear 132, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15.

[0146] When the power battery has sufficient power, the hybrid coupling system can enter the dual-motor pure electric drive mode, which is suitable for the entire vehicle speed.

[0147] (3) The first hybrid drive mode

[0148] Disengage the first clutch 6, disengage the second clutch 7, engage the third clutch 8, engage the brake 9, the engine 1 drives, the generator 2 drives or generates electricity under the drive of the engine 1, and the drive motor 3 assists in driving to establish the first hybrid drive mode;

[0149] Specifically, as Figure 4 shown, the power transmission route 1 in this drive mode is: engine 1 -> input shaft 10 -> third clutch 8 -> second sun gear 51 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15,

[0150] The power transmission route 2 is: generator 2 -> second sun gear 51 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15,

[0151] The power transmission route 3 is: engine 1 -> input shaft 10 -> third clutch 8 -> generator 2,

[0152] The power transmission route 4 is: drive motor 3 -> third gear 131 -> fourth gear 132, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15.

[0153] As Figure 5As shown in the figure, in the first hybrid drive mode, the generator 2 receives power from the engine 1 or outputs power to the second sun gear 51. The engine 1 outputs power to the second sun gear 51. The first sun gear 41 does not rotate under the action of the brake 9. The rotational speeds of the second planet carrier 53 and the first ring gear 44 are equal. The rotational speeds of the second ring gear 54 and the first planet carrier 43 are equal. The rotational speed of the second planet carrier 53 is less than the rotational speed of the second sun gear 51. The rotational speed of the first planet carrier 43 is less than the rotational speed of the second planet carrier 53. The first planet carrier 43 outputs power to the wheel 15. In this way, two-stage deceleration is achieved when the engine 1 or the generator 2 drives the wheel 15 through the CR-CR compound planetary gear set, realizing better power matching.

[0154] When the vehicle speed requirement is medium or low speed, the hybrid power coupling system can enter the first hybrid drive mode, and the engine 1 and the drive motor 3 jointly drive the wheel 15. At the same time, when the power battery has sufficient power, the generator 2 can be used to assist in driving the wheel 15. When the power battery has insufficient power, the engine 1 can be used to drive the generator 2 to generate power for the power battery.

[0155] (4) The second hybrid drive mode

[0156] Disengage the first clutch 6, engage the second clutch 7, disengage the third clutch 8, and engage the brake 9. The engine 1 drives, the generator 2 drives or generates electricity under the drive of the engine 1, and the drive motor 3 assists in driving to establish the second hybrid drive mode;

[0157] Specifically, as Figure 6 shown, the power transmission route 1 in this drive mode is: engine 1 -> input shaft 10 -> second clutch 7 -> second planet carrier 53, first ring gear 44 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15,

[0158] The power transmission route 2 is: generator 2 -> second sun gear 51 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15,

[0159] The power transmission route 3 is: engine 1 -> input shaft 10 -> second clutch 7 -> second planet carrier 53 -> generator 2,

[0160] The power transmission route 4 is: drive motor 3 -> third gear 131 -> fourth gear 132, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15.

[0161] As Figure 7As shown in the figure, in the second hybrid drive mode, the generator 2 receives power from the engine 1 through the CR-CR compound planetary gear set or outputs power to the second sun gear 51. The engine 1 outputs power to the second planet carrier 53. The first sun gear 41 does not rotate under the action of the brake 9. The rotational speeds of the second planet carrier 53 and the first ring gear 44 are equal. The rotational speeds of the second ring gear 54 and the first planet carrier 43 are equal. The rotational speed of the second planet carrier 53 is less than that of the second sun gear 51. The rotational speed of the first planet carrier 43 is less than that of the second planet carrier 53. The first planet carrier 43 outputs power to the wheel 15. In this way, through the CR-CR compound planetary gear set, a primary reduction is achieved when the engine 1 drives the wheel 15, or a two-stage reduction is achieved when the generator 2 drives the wheel 15, or a primary speed increase is achieved when the engine 1 drives the generator 2 to generate electricity, realizing better power matching and improving the power generation efficiency.

[0162] When the vehicle speed requirement is medium to high speed, the hybrid power coupling system can enter the second hybrid drive mode, and the engine 1 and the drive motor 3 jointly drive the wheel 15. At the same time, when the power battery has sufficient power, the generator 2 can be used to assist in driving the wheel 15. When the power battery has insufficient power, the engine 1 can be used to drive the generator 2 to generate electricity for the power battery.

[0163] (5) The third hybrid drive mode

[0164] Engage the first clutch 6, engage the second clutch 7, disengage the third clutch 8, disengage the brake 9, drive the engine 1, drive the generator 2 or generate electricity under the drive of the engine 1, and the drive motor 3 assists in driving to establish the third hybrid drive mode;

[0165] Specifically, as Figure 8 shown, the power transmission route 1 in this drive mode is: engine 1 -> input shaft 10 -> first clutch 6, second clutch 7 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15,

[0166] The power transmission route 2 is: generator 2 -> second sun gear 51 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15,

[0167] The power transmission route 3 is: engine 1 -> input shaft 10 -> first clutch 6, second clutch 7 -> second sun gear 51 -> generator 2,

[0168] The power transmission route 4 is: drive motor 3 -> third gear 131 -> fourth gear 132, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15.

[0169] AsFigure 9 As shown, in the third hybrid drive mode, the generator 2 receives power from the engine 1 through the CR-CR compound planetary gear set or outputs power to the second sun gear 51. The engine 1 outputs power to the CR-CR compound planetary gear set through the first clutch 6 and the second clutch 7. The CR-CR compound planetary gear set rotates as a whole, and the rotational speeds of the first sun gear 41, the second planet carrier 53, the first ring gear 44, the second ring gear 54, the first planet carrier 43, and the second sun gear 51 are equal. The first planet carrier 43 outputs power to the wheel 15. In this way, no speed reduction is achieved when the engine 1 or the generator 2 drives the wheel 15 through the CR-CR compound planetary gear set (here, no speed reduction means that the CR-CR compound planetary gear set does not reduce speed, not that power is output from the engine 1 or the generator 2 to the wheel 15 without speed reduction).

[0170] When the vehicle speed requirement is high, the hybrid power coupling system can enter the third hybrid drive mode, and the engine 1 and the drive motor 3 jointly drive the wheel 15. At the same time, when the power battery has sufficient power, the generator 2 can be used to assist in driving the wheel 15. When the power battery has insufficient power, the engine 1 can be used to drive the generator 2 to generate power for the power battery.

[0171] (6) First engine direct drive mode

[0172] Disengage the first clutch 6, disengage the second clutch 7, engage the third clutch 8, and engage the brake 9. The engine 1 drives, and the generator 2 and the drive motor 3 do not work to establish the first engine direct drive mode;

[0173] Specifically, the power transmission route in this drive mode is: engine 1 -> input shaft 10 -> third clutch 8 -> second sun gear 51 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15; for the power transmission route of the engine 1 driving the wheel 15 in this drive mode, please refer to Figure 4 .

[0174] When the vehicle speed requirement is medium or low, the hybrid power coupling system can enter the first engine direct drive mode.

[0175] (7) Second engine direct drive mode

[0176] Disengage the first clutch 6, engage the second clutch 7, disengage the third clutch 8, and engage the brake 9. The engine 1 drives, and the generator 2 and the drive motor 3 do not work to establish the second engine direct drive mode;

[0177] Specifically, the power transmission route in this driving mode is: Engine 1 -> Input shaft 10 -> Second clutch 7 -> Second planet carrier 53, First ring gear 44 -> First planet carrier 43 -> First gear 121, Intermediate shaft 11 -> Second gear 122 -> Differential 14 -> Wheel 15; For the power transmission route of Engine 1 driving Wheel 15 in this driving mode, please refer to Figure 6 。

[0178] When medium to high vehicle speeds are required, the hybrid power coupling system can enter the second engine direct drive mode.

[0179] (8) Third engine direct drive mode

[0180] Engage the first clutch 6, engage the second clutch 7, disengage the third clutch 8, disengage the brake 9, drive with Engine 1, and the generator 2 and drive motor 3 do not work to establish the third engine direct drive mode;

[0181] Specifically, the power transmission route in this driving mode is: Engine 1 -> Input shaft 10 -> First clutch 6, Second clutch 7 -> First planet carrier 43 -> First gear 121, Intermediate shaft 11 -> Second gear 122 -> Differential 14 -> Wheel 15; For the power transmission route of Engine 1 driving Wheel 15 in this driving mode, please refer to Figure 8 。

[0182] When high vehicle speeds are required, the hybrid power coupling system can enter the third engine direct drive mode.

[0183] (9) First ECVT mode

[0184] Disengage the first clutch 6, engage the second clutch 7, disengage the third clutch 8, disengage the brake 9, drive with Engine 1, drive the generator 2 or generate electricity under the drive of Engine 1, and the drive motor 3 assists in driving to establish the first ECVT mode;

[0185] Specifically, as Figure 10 shown, the power transmission route 1 in this driving mode is: Engine 1 -> Input shaft 10 -> Second clutch 7 -> Second planet carrier 53, First ring gear 44 -> First planet carrier 43 -> First gear 121, Intermediate shaft 11 -> Second gear 122 -> Differential 14 -> Wheel 15,

[0186] Power transmission route 2 is: Generator 2 -> Second sun gear 51 -> First planet carrier 43 -> First gear 121, Intermediate shaft 11 -> Second gear 122 -> Differential 14 -> Wheel 15,

[0187] The power transmission route 3 is: engine 1 -> input shaft 10 -> second clutch 7 -> second planet carrier 53 -> generator 2,

[0188] The power transmission route 4 is: drive motor 3 -> third gear 131 -> fourth gear 132, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15.

[0189] As Figure 11 shown, in the first ECVT mode, the generator 2 receives the power from the engine 1 through the CR-CR compound planetary gear set, or outputs power to the second sun gear 51. The engine 1 outputs power to the second planet carrier 53. The rotational speeds of the second planet carrier 53 and the first ring gear 44 are equal. The rotational speeds of the second ring gear 54 and the first planet carrier 43 are equal. The rotational speed of the second planet carrier 53 is less than that of the second sun gear 51. The rotational speed of the first planet carrier 43 is less than that of the second planet carrier 53. The rotational speed of the first sun gear 41 is less than that of the first planet carrier 43. The first planet carrier 43 outputs power to the wheel 15. In this way, through the CR-CR compound planetary gear set, a first-stage speed reduction is achieved when the engine 1 drives the wheel 15, or a two-stage speed reduction is achieved when the generator 2 drives the wheel 15, or a first-stage speed increase is achieved when the engine 1 drives the generator 2 to generate electricity, realizing better power matching and improving the power generation efficiency.

[0190] When the vehicle speed requirement is medium or low speed, the hybrid power coupling system can enter the first ECVT mode, and the engine 1 and the drive motor 3 jointly drive the wheel 15. At the same time, when the power battery has sufficient power, the generator 2 can be used to assist in driving the wheel 15. When the power battery has insufficient power, the engine 1 can be used to drive the generator 2 to generate electricity for the power battery.

[0191] (10) The second ECVT mode

[0192] Combined with the first clutch 6, separate the second clutch 7, separate the third clutch 8, separate the brake 9, drive by the engine 1, drive by the generator 2 or generate electricity under the drive of the engine 1, and the drive motor 3 assists in driving to establish the second ECVT mode;

[0193] Specifically, as Figure 12 shown, the power transmission route 1 in this drive mode is: engine 1 -> input shaft 10 -> first clutch 6 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15,

[0194] The power transmission route 2 is: generator 2 -> second sun gear 51 -> first planet carrier 43 -> first gear 121, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15,

[0195] The power transmission route 3 is: engine 1 -> input shaft 10 -> first clutch 6 -> second sun gear 51 -> generator 2,

[0196] The power transmission route 4 is: drive motor 3 -> third gear 131 -> fourth gear 132, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15.

[0197] As Figure 13 shown, in the second ECVT mode, the generator 2 receives power from the engine 1 through the CR-CR compound planetary gear set, or outputs power to the second sun gear 51. The engine 1 outputs power to the first sun gear 41 through the first clutch 6. The rotational speeds of the second planet carrier 53 and the first ring gear 44 are equal. The rotational speeds of the second ring gear 54 and the first planet carrier 43 are equal. The rotational speed of the second planet carrier 53 is less than the rotational speed of the second sun gear 51. The rotational speed of the first planet carrier 43 is less than the rotational speed of the second planet carrier 53. The rotational speed of the first sun gear 41 is less than the rotational speed of the first planet carrier 43. The first planet carrier 43 outputs power to the wheel 15. In this way, through the CR-CR compound planetary gear set, a first-stage speed increase is achieved when the engine 1 drives the wheel 15, or a two-stage speed reduction is achieved when the generator 2 drives the wheel 15, or a three-stage speed increase is achieved when the engine 1 drives the generator 2 to generate electricity, realizing better power matching and improving the power generation efficiency.

[0198] When the vehicle speed requirement is medium to high speed, the hybrid power coupling system can enter the second ECVT mode, and the engine 1 and the drive motor 3 jointly drive the wheel 15. At the same time, when the power battery has sufficient power, the generator 2 can be used to assist in driving the wheel 15. When the power battery has insufficient power, the engine 1 can be used to drive the generator 2 to generate electricity for the power battery.

[0199] (11) Range-extending mode

[0200] Disengage the first clutch 6, disengage the second clutch 7, engage the third clutch 8, disengage the brake 9, and the engine 1 drives the generator 2 to generate electricity, and the drive motor 3 drives to establish the range-extending mode;

[0201] Specifically, as Figure 12 shown, the power transmission route 1 in this drive mode is: engine 1 -> third clutch 8 -> generator 2,

[0202] The power transmission route 2 is: drive motor 3 -> third gear 131 -> fourth gear 132, intermediate shaft 11 -> second gear 122 -> differential 14 -> wheel 15.

[0203] When the power battery has insufficient power, the hybrid power coupling system can enter the range-extending mode, which is suitable for the full vehicle speed.

[0204] (12) Parked power generation mode

[0205] Disengage the first clutch 6, the second clutch 7, the third clutch 8, and the brake 9. The engine 1 and the generator 2 are not operating. The drive motor 3 generates a braking torque and induces a current in its windings to charge the power battery, thereby establishing a parking power generation mode.

[0206] When the vehicle brakes, the hybrid coupling system can enter the parking power generation mode. The drive motor 3 generates a braking torque to brake the wheels 15. At the same time, an induced current will be generated in the windings of the drive motor 3 to charge the power battery, realizing the recovery of braking energy.

[0207] Embodiment 2

[0208] When the generator 2 is connected to the second sun gear 51 through the third clutch 8 and not connected to the input shaft 10, the hybrid coupling system reduces the first hybrid drive mode, the first engine direct drive mode, and the range extender mode on the basis of Embodiment 1. The third clutch 8 is engaged only when the generator 2 needs to participate in driving or power generation. The power of the generator 2 is input to the second sun gear 51 through the third clutch 8, or the power of the second sun gear 51 is input to the generator 2 through the third clutch 8.

[0209] If the third clutch 8 is cancelled on the basis of the foregoing solution, it is only necessary to cancel the control of the third clutch 8, and the power transmission routes of each working mode do not need to pass through the third clutch 8 accordingly. To avoid repetition, the power transmission routes of each working mode of this solution will not be listed one by one here; its working modes are shown in Table 2.

[0210] Table 2

[0211]

[0212] Embodiment 3

[0213] When the generator 2 is connected to the input shaft 10 through the third clutch 8 and not connected to the second sun gear 51, the hybrid coupling system reduces the first hybrid drive mode, the first engine direct drive mode, the first ECVT mode, and the second ECVT mode on the basis of Embodiment 1. The dual-motor pure electric mode adds one gear (the two gears are the first dual-motor pure electric mode and the second dual-motor pure electric mode respectively). The third clutch 8 is engaged only when the generator 2 needs to participate in driving or power generation. The power of the generator 2 is first transmitted to the input shaft 10, and then input to the CR-CR compound planet through the first clutch 6 or the second clutch 7 (the power transmission path of the generator 2 from the input shaft 10 to the first planet carrier 43 in Embodiment 3 is the same as the power transmission path of the engine 1 from the input shaft 10 to the first planet carrier 43 in Embodiment 1, and will not be elaborated here), or the power of the input shaft 10 is input to the generator 2 through the third clutch 8.

[0214] If the third clutch 8 is cancelled on the basis of the foregoing solution, it is only necessary to cancel the control of the third clutch 8, and the power transmission routes of each working mode do not have to pass through the third clutch 8 accordingly. To avoid repetition, the power transmission routes of each working mode of this solution will not be listed one by one here; its working modes are reflected in Table 3.

[0215] Table 3

[0216]

[0217] The embodiment of the present invention also provides a vehicle, including a controller and a power battery connected to the controller, and further including the hybrid power coupling system described in any one of the foregoing embodiments. The engine 1, the generator 2 and the drive motor 3 are connected to the controller and controlled by the controller.

[0218] With the foregoing hybrid power coupling system, the engine 1 can drive the generator 2 to generate electricity for the power battery. The power battery can provide the power to drive the wheels 15 for the generator 2 and the drive motor 3. The engine 1 can directly drive the wheels 15. By switching the working states of the first clutch 6, the second clutch 7, the third clutch 8 (if provided) and the brake 9, the gears of the engine 1 or even the generator 2 driving the wheels 15 can be controlled, so as to realize multiple driving modes and obtain higher transmission efficiency; in the engine direct drive mode, the energy conversion between the engine and the motor and between the motor and the engine is avoided, and the transmission efficiency is improved; since the dual-motor pure electric mode is realized, the power performance of the whole vehicle can be further improved, and the production cost of the whole vehicle can be reduced; the engine 1 and the generator 2 share a reduction component, with a simple and compact structure, reducing the number of parts, which is beneficial to reducing the load, and thus can further improve the power performance of the whole vehicle and reduce the production cost of the whole vehicle; in the hybrid drive mode, the dual-motor pure electric mode, the single-motor pure electric mode and the range-extending mode (if any), the drive motor 3 is involved in driving to avoid power interruption; by effectively supplementing the driving power required by the wheels 15 through the power battery, the power of the internal combustion engine can be more reasonably allocated, and the working state of the internal combustion engine is kept unaffected or less affected by the road conditions. The internal combustion engine can always work in the set optimal state to improve the fuel efficiency of the whole vehicle.

[0219] In one embodiment, multiple driving modes (single-motor pure electric mode, dual-motor pure electric drive mode, hybrid drive mode, engine direct drive mode, ECVT mode and range-extending mode) of the hybrid power coupling system can be automatically switched according to the battery SOC value and the vehicle speed requirement. The control process for automatically switching multiple driving modes includes the following steps:

[0220] S1. The controller judges the magnitude relationship between the battery SOC value and the first threshold, or simultaneously judges the magnitude relationship between the battery SOC value and the first threshold and the magnitude relationship between the vehicle speed and the second threshold;

[0221] S2. The controller switches the working mode of the hybrid power coupling system according to the judgment result of step S1;

[0222] S3. During braking, the controller controls the drive motor 3 to generate a braking torque and induce a current in its windings to charge the power battery.

[0223] Among them, the first threshold is used to judge the level of the battery SOC value, and the second threshold is used to judge the level of the vehicle speed. In this embodiment, the value ranges of the first threshold and the second threshold are not limited, and usually can be freely set according to specific control strategies. Under different control strategies, the values of the first threshold and the second threshold are different. After setting the first threshold and the second threshold in the controller, the controller automatically makes the judgment of step S1 and automatically switches between multiple driving modes according to the judgment result of step S1.

[0224] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hybrid power coupling system, comprising an engine, a generator, a drive motor, a first planetary gear set, a second planetary gear set and a brake. The first planetary gear set includes a first sun gear, a first planet carrier and a first ring gear. The second planetary gear set includes a second sun gear, a second planet carrier and a second ring gear. The first planet carrier is connected to the second ring gear, and the first ring gear is connected to the second planet carrier. Characterized in that, it further includes a first clutch, a second clutch, an input shaft and an intermediate shaft; the engine is connected to the input shaft; the input shaft is connected to the first sun gear through the first clutch, and the input shaft is connected to the second planet carrier through the second clutch; the brake is used to brake the first sun gear, and the first planet carrier meshes with a first gear fixedly arranged on the intermediate shaft; the generator is connected to the second sun gear and / or the input shaft; the drive motor is connected to the intermediate shaft; the intermediate shaft outputs power to the wheels; the first sun gear and the second sun gear are rotatably arranged on the input shaft; the first clutch and the second clutch are integrated into a dual clutch with a common clutch housing. The dual clutch is located between the first sun gear and the second sun gear, and the clutch housing is arranged on the input shaft; it further includes a third clutch, and the generator is connected to the input shaft through the third clutch.

2. The hybrid power coupling system according to claim 1, Characterized in that, the housing of the third clutch is connected to the rotating shaft of the generator and the second sun gear.

3. The hybrid power coupling system according to claim 2, Characterized in that, the hybrid power coupling system has a single-motor pure electric mode, a dual-motor pure electric mode, a first hybrid drive mode, a second hybrid drive mode, a third hybrid drive mode, a first engine direct drive mode, a second engine direct drive mode, a third engine direct drive mode, a first ECVT mode, a second ECVT mode and an extended range mode; Disengage the first clutch, disengage the second clutch, disengage the third clutch, disengage the brake, the engine and the generator do not work, and the drive motor drives to establish the single-motor pure electric mode; Disengage the first clutch, disengage the second clutch, disengage the third clutch, engage the brake, the engine does not work, and the generator and the drive motor drive together to establish the dual-motor pure electric mode; Disengage the first clutch, disengage the second clutch, engage the third clutch, engage the brake, the engine drives, the generator drives or generates electricity under the drive of the engine, and the drive motor assists in driving to establish the first hybrid drive mode; Disengage the first clutch, engage the second clutch, disengage the third clutch, engage the brake, the engine drives, the generator drives or generates electricity under the drive of the engine, and the drive motor assists in driving to establish the second hybrid drive mode; Engage the second clutch in combination with the first clutch, disengage the third clutch, and disengage the brake. The engine drives, the generator drives or generates electricity under the drive of the engine, and the drive motor assists in driving to establish the third hybrid drive mode; Disengage the first clutch, disengage the second clutch, engage the third clutch, and engage the brake. The engine drives, and the generator and the drive motor do not operate to establish the first engine direct drive mode; Disengage the first clutch, engage the second clutch, disengage the third clutch, and engage the brake. The engine drives, and the generator and the drive motor do not operate to establish the second engine direct drive mode; Engage the first clutch, engage the second clutch, disengage the third clutch, and disengage the brake. The engine drives, and the generator and the drive motor do not operate to establish the third engine direct drive mode; Disengage the first clutch, engage the second clutch, disengage the third clutch, and disengage the brake. The engine drives, the generator drives or generates electricity under the drive of the engine, and the drive motor assists in driving to establish the first ECVT mode; Engage the first clutch, disengage the second clutch, disengage the third clutch, and disengage the brake. The engine drives, the generator drives or generates electricity under the drive of the engine, and the drive motor assists in driving to establish the second ECVT mode; Disengage the first clutch, disengage the second clutch, engage the third clutch, and disengage the brake. The engine drives the generator to generate electricity, and the drive motor drives to establish the range extender mode.

4. The hybrid power coupling system according to claim 1, characterized in that it further includes a first reduction gear pair, and the drive motor is connected to the intermediate shaft through the first reduction gear pair.

5. The hybrid power coupling system according to claim 4, characterized in that the engine and the generator are coaxially arranged and are respectively located at both ends of the input shaft; the first reduction gear pair includes a third gear and a fourth gear that mesh with each other. The third gear is fixedly arranged on the rotating shaft of the drive motor, the fourth gear is fixedly arranged on one end of the intermediate shaft, and the first gear is fixedly arranged on the other end of the intermediate shaft; or the first reduction gear pair includes the first gear and the third gear. The third gear is fixedly arranged on the rotating shaft of the drive motor and meshes with the first gear.

6. The hybrid power coupling system according to claim 1, characterized in that when the generator is connected to the second sun gear: the hybrid power coupling system has a single-motor pure electric mode, a dual-motor pure electric mode, a second hybrid drive mode, a third hybrid drive mode, a second engine direct drive mode, a third engine direct drive mode, a first ECVT mode, and a second ECVT mode; Disengage the first clutch, disengage the second clutch, disengage the brake, stop the engine and the generator, and drive the drive motor to establish the single-motor pure electric mode; Disengage the first clutch, disengage the second clutch, engage the brake, stop the engine, and drive the generator and the drive motor together to establish the dual-motor pure electric mode; Disengage the first clutch, engage the second clutch, engage the brake, drive the engine, drive the generator or generate electricity under the drive of the engine, and the drive motor assists in driving to establish the second hybrid drive mode; Engage the first clutch, engage the second clutch, disengage the brake, drive the engine, drive the generator or generate electricity under the drive of the engine, and the drive motor assists in driving to establish the third hybrid drive mode; Disengage the first clutch, engage the second clutch, engage the brake, drive the engine, and stop the generator and the drive motor to establish the second engine direct drive mode; Engage the first clutch, engage the second clutch, disengage the brake, drive the engine, and stop the generator and the drive motor to establish the third engine direct drive mode; Disengage the first clutch, engage the second clutch, disengage the brake, drive the engine, drive the generator or generate electricity under the drive of the engine, and the drive motor assists in driving to establish the first ECVT mode; Engage the first clutch, disengage the second clutch, disengage the brake, drive the engine, drive the generator or generate electricity under the drive of the engine, and the drive motor assists in driving to establish the second ECVT mode; When the generator is connected to the input shaft: the hybrid power coupling system has a single-motor pure electric mode, a first dual-motor pure electric mode, a second dual-motor pure electric mode, a second hybrid drive mode, a third hybrid drive mode, a second engine direct drive mode, a third engine direct drive mode, and an extended range mode; Disengage the first clutch, disengage the second clutch, disengage the brake, stop the engine and the generator, and drive the drive motor to establish the single-motor pure electric mode; Disengage the first clutch, engage the second clutch, engage the brake, stop the engine, and drive the generator and the drive motor together to establish the first dual-motor pure electric mode; Engage the first clutch, engage the second clutch, disengage the brake, stop the engine, and drive the generator and the drive motor together to establish the second dual-motor pure electric mode; Disengage the first clutch, engage the second clutch, engage the brake, drive the engine, drive the generator or generate electricity under the drive of the engine, and the drive motor assists in driving to establish the second hybrid drive mode; Engage the second clutch in combination with the first clutch, disengage the brake, drive the engine, drive the generator or generate electricity under the drive of the engine, and assist the drive of the drive motor to establish the third hybrid drive mode; Disengage the first clutch, engage the second clutch, engage the brake, drive the engine, and keep the generator and the drive motor inoperative to establish the second engine direct drive mode; Engage the first clutch, engage the second clutch, disengage the brake, drive the engine, and keep the generator and the drive motor inoperative to establish the third engine direct drive mode; Disengage the first clutch, disengage the second clutch, disengage the brake, drive the generator to generate electricity by the engine, and drive the drive motor to establish the range extender mode.

7. A vehicle, comprising a controller and a battery connected to the controller, wherein, it further comprises the hybrid power coupling system according to any one of claims 1-6, and the engine, the generator and the drive motor are connected to the controller and controlled by the controller.

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