A hybrid drive system and a vehicle

Abstract

The present invention belongs to the technical field of automotive drive, and particularly relates to a hybrid drive system and an automobile. The hybrid drive system includes a generator, an engine, a drive motor, a planetary gear mechanism, a clutch assembly, a brake assembly, and a gear train assembly; the gear train assembly includes a first gear train and a second gear train; the first gear is connected to the first shaft through the first clutch, and the second gear is connected to the third shaft; the third gear is connected to the second shaft, and the third gear is connected to the third shaft through the third clutch; the sun gear is connected to the generator, the planet carrier is connected to the engine, and the ring gear is connected to the first gear through the second clutch; the brake assembly includes a first brake for braking the first shaft and a second brake for braking the ring gear. In the present invention, the hybrid drive system integrates a series hybrid mode and a parallel hybrid mode, the drive motor is small in volume and light in weight, and the manufacturing cost of the hybrid drive system is low.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive drive, and particularly relates to a hybrid drive system and an automobile. Background Art

[0002] At present, the birth of motor hybrid technology has opened up a new way to achieve a perfect match between the engine and the driving wheels of an automobile. Among them, the most representative are the series hybrid system and the parallel hybrid system. In the series hybrid system, an internal combustion engine - generator - engine - shaft system - driving wheels form a series power chain, and the power assembly structure is extremely simple. Among them, the combination of the generator and the engine can be regarded as a transmission in the traditional sense, and 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 regulating device to complete independent regulation of speed and torque. In the parallel hybrid system, there are two parallel and independent power chains. One is composed of a traditional mechanical transmission, and the other is composed of a motor and a battery system. The mechanical transmission is responsible for speed regulation, while the motor and the battery system complete power or torque regulation; in order to give full play to the potential of the entire system, the mechanical transmission also needs to adopt a continuously variable transmission method.

[0003] However, in the prior art, the series hybrid system has the following disadvantages: all its power is output through the generator and the engine. Therefore, the requirement for the motor power is high, which results in a large volume and heavy weight of the motor; at the same time, since the energy transmission process needs to go through two conversions of mechanical - electrical and electrical - mechanical, the efficiency of the entire series hybrid system is relatively low. In the parallel hybrid system, two independent subsystems need to be set up simultaneously, and the cost is high. Therefore, it is usually only used in weak hybrid systems. Summary of the Invention

[0004] The present invention solves the technical problems such as the large volume of the existing series hybrid system and the high cost of the parallel hybrid system, and provides a hybrid drive system and an automobile.

[0005] In view of the above problems, a hybrid drive system provided by an embodiment of the present invention includes a generator, an engine, a drive motor, a first shaft, a second shaft, a third shaft, a planetary gear mechanism, a clutch assembly, a brake assembly, and a gear train assembly; the clutch assembly includes a first clutch, a second clutch, and a third clutch; the generator is connected to the first shaft, the engine is connected to the second shaft, and the drive motor is connected to the third shaft;

[0006] The gear train assembly includes a first gear train and a second gear train; the first gear train includes a first gear and a second gear that mesh with each other, the first gear is connected to the first shaft through the first clutch, and the second gear is connected to the third shaft; the second gear train includes a third gear and a fourth gear that mesh with each other, the third gear is connected to the second shaft, and the fourth gear is connected to the third shaft through the third clutch;

[0007] The planetary gear mechanism includes a planetary carrier, a sun gear, planetary gears, and a ring gear; the sun gear and the ring gear both mesh with the planetary gears; the sun gear is connected to the first shaft, the planetary carrier is connected to the second shaft, and the ring gear is connected to the first gear through the second clutch;

[0008] The braking assembly includes a first brake for braking the first shaft and a second brake for braking the ring gear.

[0009] Optionally, the clutch assembly further includes a one-way clutch for braking the planetary carrier; one end of the one-way clutch is connected to the vehicle body, and the other end of the one-way clutch is selectively connected to the second shaft.

[0010] Optionally, the gear train assembly further includes a third gear train and a fourth gear train; the third gear train includes a fifth gear and a sixth gear that mesh with each other, and the fourth gear train includes a seventh gear and an eighth gear that mesh with each other; the fifth gear and the seventh gear are both sleeved on the third shaft, and the sixth gear and the eighth gear are both connected to the output end of the drive motor;

[0011] The hybrid drive system further includes a synchronizer connected to the third shaft and located between the fifth gear and the seventh gear; the synchronizer selectively connects the fifth gear and the seventh gear.

[0012] Optionally, the gear train assembly further includes a fifth gear train; the fifth gear train includes a ninth gear and a tenth gear that mesh with each other; the output end of the generator is connected to the first shaft through the ninth gear.

[0013] Optionally, the hybrid drive system further includes a differential connected to the vehicle wheels; the differential includes a differential gear that meshes with the second gear.

[0014] Optionally, the first shaft and the second shaft are coaxially arranged.

[0015] Optionally, the hybrid drive system has a single-motor pure electric mode, and the single-motor pure electric mode includes a single-motor pure electric first gear mode, a single-motor pure electric second gear mode, and a single-motor pure electric third gear mode;

[0016] When the hybrid drive system is in the single-motor pure-electric first gear mode, the first brake, the second brake, the first clutch, the second clutch, and the third clutch are all disengaged, and the drive motor drives the vehicle wheels to rotate;

[0017] When the hybrid drive system is in the single-motor pure-electric second gear mode, the first brake, the second brake, the second clutch, and the third clutch are all disengaged, and when the first clutch is engaged, the generator drives the vehicle wheels to rotate;

[0018] When the hybrid drive system is in the single-motor pure-electric third gear mode, the first brake, the second brake, the first clutch, and the third clutch are all disengaged, and when the second clutch is engaged, the generator drives the vehicle wheels to rotate.

[0019] Optionally, the hybrid drive system has a dual-motor pure-electric mode, and the dual-motor pure-electric mode includes a dual-motor pure-electric first gear mode and a dual-motor pure-electric second gear mode;

[0020] When the hybrid drive system is in the dual-motor pure-electric first gear mode, the first brake, the second brake, the second clutch, and the third clutch are all disengaged, and when the first clutch is engaged, the generator and the drive motor drive the vehicle wheels to rotate simultaneously;

[0021] When the hybrid drive system is in the dual-motor pure-electric second gear mode, the first brake, the second brake, the first clutch, and the third clutch are all disengaged, and when the second clutch is engaged, the generator and the drive motor drive the vehicle wheels to rotate simultaneously.

[0022] Optionally, the hybrid drive system has an engine direct drive mode, and the engine direct drive mode includes an engine direct drive first gear mode, an engine direct drive second gear mode, an engine direct drive third gear mode, and an engine direct drive fourth gear mode

[0023] When the hybrid drive system is in the engine direct drive first gear mode, the first brake, the second clutch, and the third clutch are all disengaged, and when the first clutch is engaged and the second brake is braked, the engine drives the vehicle wheels to rotate;

[0024] When the hybrid drive system is in the engine direct drive second gear mode, the first clutch, the third clutch, and the second brake are all disengaged, and when the second clutch is engaged and the first brake is braked, the engine drives the vehicle wheels to rotate;

[0025] When the hybrid drive system is in the engine direct drive third gear mode, the first brake, the second brake, and the third clutch are all disengaged, and the first clutch and the second clutch are both engaged, and the engine drives the vehicle wheels to rotate;

[0026] When the hybrid drive system is in the engine direct drive fourth gear mode, the first brake, the second brake, the first clutch, and the second clutch are all disengaged, and the third clutch is engaged, and the engine drives the vehicle wheels to rotate.

[0027] Optionally, the hybrid drive system has a parallel hybrid mode, and the parallel hybrid mode includes a parallel hybrid first gear mode, a parallel hybrid second gear mode, a parallel hybrid third gear mode, and a parallel hybrid fourth gear mode;

[0028] When the hybrid drive system is in the parallel hybrid first gear mode, the first brake, the second clutch, and the third clutch are all disengaged, and the first clutch is engaged, the second brake is braked, and the generator, the engine, and the drive motor drive the vehicle wheels to rotate simultaneously;

[0029] When the hybrid drive system is in the parallel hybrid second gear mode, the second brake, the first clutch, and the third clutch are all disengaged, and the first brake is braked, the second clutch is engaged, and the engine and the drive motor drive the vehicle wheels to rotate simultaneously;

[0030] When the hybrid drive system is in the parallel hybrid third gear mode, the first brake, the second brake, and the third clutch are all disengaged, and the first clutch and the second clutch are both engaged, and the generator, the engine, and the drive motor drive the vehicle wheels to rotate simultaneously;

[0031] When the hybrid drive system is in the parallel hybrid fourth gear mode, the first brake, the second brake, and the second clutch are all disengaged, and the first clutch and the third clutch are both engaged, and the generator, the engine, and the drive motor drive the vehicle wheels to rotate simultaneously.

[0032] Optionally, the hybrid drive system has a series extended range mode. When the hybrid drive system is in the series extended range mode, the first brake, the first clutch, the second clutch, and the third clutch are all disengaged, and the second clutch is braked. The engine drives the generator to generate electricity, and the drive motor drives the vehicle wheels to rotate.

[0033] Optionally, the hybrid drive system has a continuously variable transmission mode; when the hybrid drive system is in the continuously variable transmission mode, the first brake, the first clutch, the second clutch, and the third clutch are all disengaged, the second clutch is braked, and the engine and the drive motor drive the vehicle wheels to rotate simultaneously.

[0034] In the present invention, the hybrid drive system includes a clutch assembly having a first clutch, a second clutch, and a third clutch, and a brake assembly having a first brake and a second brake; by separating and engaging the clutches in the clutch assembly, and braking and separating the brakes in the brake assembly, the hybrid drive system can be controlled to be in different drive modes (the drive modes include single-motor pure electric first gear mode, single-motor pure electric second gear mode, single-motor pure electric third gear mode, dual-motor pure electric first gear mode, dual-motor pure electric second gear mode, engine direct drive first gear mode, engine direct drive second gear mode, engine direct drive third gear mode, engine direct drive fourth gear mode, parallel hybrid first gear mode, parallel hybrid second gear mode, parallel hybrid third gear mode, parallel hybrid fourth gear mode, series extended range mode, and continuously variable transmission mode, etc.). Moreover, during the switching process of the drive modes, the drive motor participates in driving, and the power of the vehicle does not interrupt, improving the driving experience of the vehicle; at the same time, the hybrid drive system integrates a series hybrid mode and a parallel hybrid mode, with less requirement for the power of the drive motor, thus making the drive motor small in volume and light in weight; and the manufacturing cost of the hybrid drive system is low. Also, the hybrid drive system can be mounted on traditional hybrid vehicles and plug-in hybrid vehicles, thereby improving the applicability and versatility of the hybrid drive system.

[0035] An embodiment of the present invention further provides a vehicle, including the above-mentioned hybrid drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the drawings and embodiments.

[0037] Figure 1 It is a schematic diagram of a hybrid drive system provided by an embodiment of the present invention;

[0038] Figure 2 It is a schematic diagram of a hybrid drive system provided by another embodiment of the present invention;

[0039] Figure 3 It is a schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the single-motor pure electric first gear mode;

[0040] Figure 4 It is a schematic diagram of the hybrid drive system provided by another embodiment of the present invention in the single-motor pure electric first gear mode;

[0041] Figure 5 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the single-motor pure-electric second-gear mode;

[0042] Figure 6 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the single-motor pure-electric third-gear mode;

[0043] Figure 7 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the dual-motor pure-electric first-gear mode;

[0044] Figure 8 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the dual-motor pure-electric second-gear mode;

[0045] Figure 9 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the engine direct-drive first-gear mode;

[0046] Figure 10 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the engine direct-drive second-gear mode;

[0047] Figure 11 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the engine direct-drive third-gear mode;

[0048] Figure 12 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the engine direct-drive fourth-gear mode;

[0049] Figure 13 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the parallel hybrid first-gear mode;

[0050] Figure 14 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the parallel hybrid second-gear mode;

[0051] Figure 15 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the parallel hybrid third-gear mode;

[0052] Figure 16 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the parallel hybrid fourth-gear mode;

[0053] Figure 17 Schematic diagram of the hybrid drive system provided by an embodiment of the present invention in the series extended-range mode;

[0054] Figure 18Schematic diagram of a hybrid drive system in a continuously variable transmission mode provided by an embodiment of the present invention;

[0055] Figure 19 Schematic diagram of a hybrid drive system provided by another embodiment of the present invention.

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

[0057] 1. Generator; 11. First shaft; 2. Engine; 21. Second shaft; 3. Drive motor; 31. Third shaft; 4. Planetary gear mechanism; 41. Planet carrier; 42. Sun gear; 43. Planet gear; 44. Ring gear; 5. Clutch assembly; 51. First clutch; 52. Second clutch; 53. Third clutch; 54. One-way clutch; 6. Brake assembly; 61. First brake; 62. Second brake; 7. Gear train assembly; 71. First gear train; 711. First gear; 712. Second gear; 72. Second gear train; 721. Third gear; 722. Fourth gear; 73. Third gear train; 731. Fifth gear; 732. Sixth gear; 74. Fourth gear train; 741. Seventh gear; 742. Eighth gear; 75. Fifth gear train; 751. Ninth gear; 752. Tenth gear; 8. Synchronizer; 9. Differential; 91. Differential gear; 10. Automobile wheel. Detailed implementation manners

[0058] 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.

[0059] It should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "middle", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0060] Such as Figure 1 And Figure 2As shown in the figure, an embodiment of the present invention provides a hybrid drive system, including a generator 1, an engine 2, a drive motor 3, a first shaft 11, a second shaft 21, a third shaft 31, a planetary gear mechanism 4, a clutch assembly 5, a brake assembly 6, and a gear train assembly 7; the clutch assembly 5 includes a first clutch 51, a second clutch 52, and a third clutch 53; the generator 1 is connected to the first shaft 11, the engine 2 is connected to the second shaft 21, and the drive motor 3 is connected to the third shaft 31; preferably, the first shaft 11, the second shaft 21, and the third shaft 31 are all arranged in parallel.

[0061] The gear train assembly 7 includes a first gear train 71 and a second gear train 72; the first gear train 71 includes a first gear 711 and a second gear 712 that mesh with each other, the first gear 711 is connected to the first shaft 11 through the first clutch 51, and the second gear 712 is connected to the third shaft 31; the second gear train 72 includes a third gear 721 and a fourth gear 722 that mesh with each other, the third gear 721 is connected to the second shaft 21, and the fourth gear 722 is connected to the third shaft 31 through the third clutch 53; it can be understood that the first engaging portion of the first clutch 51 is installed on the first shaft 11, and the second engaging portion of the first clutch 51 is installed on the first gear 711. When the first engaging portion and the second engaging portion are combined with each other, the first shaft 11 and the first gear 711 are fixedly connected. Further, the fifth engaging portion of the third clutch 53 is installed on the third shaft 31, and the sixth engaging portion of the third clutch 53 is installed on the fourth gear 722. When the fifth engaging portion and the sixth engaging portion are combined with each other, the fourth gear 722 and the third shaft 31 are fixedly connected.

[0062] The planetary gear mechanism 4 includes a planet carrier 41, a sun gear 42, planet gears 43, and a ring gear 44; the sun gear 42 and the ring gear 44 both mesh with the planet gears 43; the sun gear 42 is connected to the first shaft 11, the planet carrier 41 is connected to the second shaft 21, and the ring gear 44 is connected to the first gear 711 through the second clutch 52; it can be understood that the third engaging portion of the second clutch 52 is installed on the ring gear 44, and the fourth engaging portion of the second clutch 52 is installed on the first gear 711, or on the second engaging portion installed on the first gear 711. When the third engaging portion and the fourth engaging portion are combined with each other, the ring gear 44 and the first gear 711 are fixedly connected.

[0063] Understandably, the sun gear 42 and the planet gears 43 are both mounted on the planet carrier 41 through their respective rotating shafts, and the number of the planet gears 43 can be set to multiple (two, three, etc.) according to actual needs; the multiple planet gears 43 are all mounted inside the ring gear 44 and are all meshed with the internal teeth of the ring gear 44.

[0064] The braking assembly 6 includes a first brake 61 for braking the first shaft 11 and a second brake 62 for braking the ring gear 44. Understandably, when the first brake 61 brakes, the first shaft 11 will be fixed; when the second brake 62 brakes, the ring gear 44 will be fixed, but relative rotation can be achieved between the sun gear 42 and the planet gears 43.

[0065] In the present invention, the hybrid drive system includes a clutch assembly 5 having a first clutch 51, a second clutch 52, and a third clutch 53, and a braking assembly 6 having a first brake 61 and a second brake 62; by separating and engaging the clutches in the clutch assembly 5 and braking and separating the brakes in the braking assembly 6, the hybrid drive system can be controlled to be in different drive modes (the drive modes include single-motor pure electric first gear mode, single-motor pure electric second gear mode, single-motor pure electric third gear mode, dual-motor pure electric first gear mode, dual-motor pure electric second gear mode, engine direct drive first gear mode, engine direct drive second gear mode, engine direct drive third gear mode, engine direct drive fourth gear mode, parallel hybrid first gear mode, parallel hybrid second gear mode, parallel hybrid third gear mode, parallel hybrid fourth gear mode, series extended range mode, and continuously variable transmission mode, etc.). Moreover, during the drive mode switching process, the drive motor 3 participates in driving, and the power of the vehicle does not interrupt, improving the driving experience of the vehicle; at the same time, the hybrid drive system integrates a series hybrid mode and a parallel hybrid mode, requiring less power from the drive motor 3, so that the drive motor 3 is small in volume and light in weight; and the manufacturing cost of the hybrid drive system is low. In addition, the hybrid drive system can be mounted on traditional hybrid vehicles and plug-in hybrid vehicles, thus improving the applicability and versatility of the hybrid drive system.

[0066] In one embodiment, as Figure 1 and Figure 2As shown, the clutch assembly 5 further includes a one-way clutch 54 for braking the planet carrier 41; one end of the one-way clutch 54 is connected to the vehicle body, and the other end of the one-way clutch 54 is selectively connected to the second shaft 21. It can be understood that the setting of the one-way clutch 54 can ensure that the engine 2 drives the first shaft 11 to rotate, and the rotation of the first shaft 11 cannot drive the reverse rotation of the engine 2, thus effectively protecting the vehicle engine 2 and extending the service life of the vehicle engine 2.

[0067] In one embodiment, as Figure 2 shown, the gear train assembly 7 further includes a third gear train 73 and a fourth gear train 74; the third gear train 73 includes a fifth gear 731 and a sixth gear 732 that mesh with each other, and the fourth gear train 74 includes a seventh gear 741 and an eighth gear 742 that mesh with each other; the fifth gear 731 and the seventh gear 741 are both sleeved on the third shaft 31, and the sixth gear 732 and the eighth gear 742 are both connected to the output end of the drive motor 3; it can be understood that the drive motor 3 can be connected to the third shaft 31 through the third gear train 73, or connected to the third shaft 31 through the fourth gear train 74, so that the power of the drive motor 3 can be transmitted to the third shaft 31 through the third gear train 73 or the fourth gear train 74.

[0068] The hybrid drive system further includes a synchronizer 8 connected to the third shaft 31 and located between the fifth gear 731 and the seventh gear 741; the synchronizer 8 selectively connects the fifth gear 731 and the seventh gear 741. It can be understood that the setting of the synchronizer 8 can connect the output end of the drive motor 3 to the third shaft 31 through the third gear train 73 or the fourth gear train 74, and can also control the separation of the drive motor 3 from the third shaft 31. The drive motor 3 can transmit its power to the vehicle wheels 10 through the third gear train 73 or the fourth gear train 74, thereby increasing the transmission ratio of the vehicle and improving the driving pleasure of the vehicle driver.

[0069] In one embodiment, as Figure 19 shown, the gear train assembly 7 further includes a fifth gear train 75; the fifth gear train 75 includes a ninth gear 751 and a tenth gear 752 that mesh with each other; the output end of the generator 1 is connected to the first shaft 11 through the ninth gear 751. It can be understood that the power of the generator 1 can be transmitted to the first shaft 11 through the fifth gear train 75. In this embodiment, the output end of the generator 1 has an additional reduction ratio, which can reduce the power requirement of the generator 1, thereby effectively reducing the volume of the generator 1 and reducing the layout space of the hybrid drive system on the vehicle.

[0070] In one embodiment, as Figure 1 and 2 shown, the hybrid drive system further includes a differential 9 connected to the vehicle wheels 10; the differential 9 includes a differential gear 91 meshing with the second gear 712. It can be understood that both the first gear 711 and the differential gear 91 mesh with the second gear 712, and the differential 9 is connected to the vehicle wheels 10 through two half shafts of the vehicle, thereby driving the vehicle wheels 10 to rotate.

[0071] In one embodiment, as Figure 1 and 2 shown, the first shaft 11 and the second shaft 21 are coaxially arranged. That is, the center line of the first shaft 11 coincides with the center line of the second shaft 21. It can be understood that the coaxially arranged first shaft 11 and second shaft 21 can effectively reduce the volume of the hybrid drive system.

[0072] In one embodiment, as Figures 3 to 6 shown in the figure, the hybrid drive system has a single-motor pure electric mode, and the single-motor pure electric mode includes a single-motor pure electric first gear mode, a single-motor pure electric second gear mode, and a single-motor pure electric third gear mode;

[0073] As Figure 3 and Figure 4 shown, when the hybrid drive system is in the single-motor pure electric first gear mode, the first brake 61, the second brake 62, the first clutch 51, the second clutch 52, and the third clutch 53 are all disengaged, and the drive motor 3 drives the vehicle wheels 10 to rotate; specifically, the power output by the drive motor 3 is sequentially transmitted to the vehicle wheels 10 through the third shaft 31 and the second gear 712.

[0074] As Figure 5 shown, when the hybrid drive system is in the single-motor pure electric second gear mode, the first brake 61, the second brake 62, the second clutch 52, and the third clutch 53 are all disengaged, the first clutch 51 is engaged, and the generator 1 drives the vehicle wheels 10 to rotate; specifically, the power output by the generator 1 is sequentially transmitted to the vehicle wheels 10 through the first shaft 11, the first gear 711, and the second gear 712.

[0075] As Figure 6As shown, when the hybrid drive system is in the single-motor pure-electric three-speed mode, the first brake 61, the second brake 62, the first clutch 51, and the third clutch 53 are all disengaged, and the second clutch 52 is engaged. The generator 1 drives the vehicle wheels 10 to rotate. Specifically, the power output by the generator 1 is transmitted to the vehicle wheel end in sequence through the first shaft 11, the sun gear 42, the planet gear 43, the ring gear 44, the second clutch 52, the first gear 711, and the second gear 712.

[0076] In this embodiment, the hybrid drive system has three single-motor pure-electric modes, which increases the speed ratio range of the vehicle, thereby improving the driving experience of the vehicle.

[0077] In one embodiment, as Figure 7 and Figure 8 shown, the hybrid drive system has a dual-motor pure-electric mode, and the dual-motor pure-electric mode includes a dual-motor pure-electric first gear mode and a dual-motor pure-electric second gear mode;

[0078] As Figure 7 shown, when the hybrid drive system is in the dual-motor pure-electric first gear mode, the first brake 61, the second brake 62, the second clutch 52, and the third clutch 53 are all disengaged, and the first clutch 51 is engaged. The generator 1 and the drive motor 3 drive the vehicle wheels 10 to rotate simultaneously. Specifically, at this time, the hybrid drive system has two transmission paths; Transmission path one: The power of the generator 1 is transmitted to the vehicle wheels 10 in sequence through the first shaft 11, the first clutch 51, the first gear 711, and the second gear 712; Transmission path two: The power of the drive motor 3 is transmitted to the vehicle wheels 10 in sequence through the third shaft 31 and the second gear 712.

[0079] As Figure 8 shown, when the hybrid drive system is in the dual-motor pure-electric second gear mode, the first brake 61, the second brake 62, the first clutch 51, and the third clutch 53 are all disengaged, and the second clutch 52 is engaged. The generator 1 and the drive motor 3 drive the vehicle wheels 10 to rotate simultaneously. At this time, the hybrid drive system has two transmission paths. Transmission path one: The power of the generator 1 is transmitted to the vehicle wheels 10 in sequence through the first shaft 11, the sun gear 42, the planet gear 43, the ring gear 44, the second clutch 52, the first gear 711, and the second gear 712; Transmission path two: The power of the drive motor 3 is transmitted to the vehicle wheels 10 in sequence through the third shaft 31 and the second gear 712.

[0080] In this embodiment, the hybrid drive system has two dual-motor pure electric modes, which increases the speed ratio range of the vehicle and thus improves the driving experience of the vehicle.

[0081] In one embodiment, as Figures 9 to 12 shown, the hybrid drive system has an engine direct drive mode, and the engine direct drive mode includes an engine direct drive first gear mode, an engine direct drive second gear mode, an engine direct drive third gear mode, and an engine direct drive fourth gear mode

[0082] As Figure 9 shown, when the hybrid drive system is in the engine direct drive first gear mode, the first brake 61, the second clutch 52, and the third clutch 53 are all disengaged, and the first clutch 51 is engaged, and the second brake 62 is braked, and the engine 2 drives the vehicle wheels 10 to rotate; specifically, the power of the engine 2 is sequentially transmitted to the vehicle wheels 10 through the second shaft 21, the planet carrier 41, the planet gears 43, the sun gear 42, the first clutch 51, the first gear 711, and the second gear 712.

[0083] As Figure 10 shown, when the hybrid drive system is in the engine direct drive second gear mode, the first clutch 51, the third clutch 53, and the second brake 62 are all disengaged, and the second clutch 52 is engaged, and the first brake 61 is braked, and the engine 2 drives the vehicle wheels 10 to rotate in the engine direct drive second gear mode; specifically, the power of the engine 2 is sequentially transmitted to the vehicle wheels 10 through the second shaft 21, the planet carrier 41, the planet gears 43, the ring gear 44, the second clutch 52, the first gear 711, and the second gear 712.

[0084] As Figure 11 shown, when the hybrid drive system is in the engine direct drive third gear mode, the first brake 61, the second brake 62, and the third clutch 53 are all disengaged, and when the first clutch 51 and the second clutch 52 are both engaged, the engine 2 drives the vehicle wheels 10 to rotate; specifically, the power of the engine 2 is sequentially transmitted to the vehicle wheels 10 through the second shaft 21, the planetary gear mechanism 4 (including the planet carrier 41, the planet gears 43, the sun gear 42, and the ring gear 44), the first gear 711, and the second gear 712.

[0085] As Figure 12As shown, when the hybrid drive system is in the engine direct drive fourth gear mode, the first brake 61, the second brake 62, the first clutch 51, and the second clutch 52 are all disengaged, and the third clutch 53 is engaged. The engine 2 drives the vehicle wheels 10 to rotate. Specifically, the power of the engine 2 is transmitted to the vehicle wheels 10 successively through the second shaft 21, the third gear 721, the fourth gear 722, the third clutch 53, the third shaft 31, and the second gear 712.

[0086] In this embodiment, the hybrid drive system has four engine direct drive modes, which increases the speed ratio range of the vehicle and thus improves the driving experience of the vehicle.

[0087] In one embodiment, as Figures 13 to 16 shown, the hybrid drive system has a parallel hybrid mode, and the parallel hybrid mode includes a parallel hybrid first gear mode, a parallel hybrid second gear mode, a parallel hybrid third gear mode, and a parallel hybrid fourth gear mode;

[0088] As Figure 13 shown, when the hybrid drive system is in the parallel hybrid first gear mode, the first brake 61, the second clutch 52, and the third clutch 53 are all disengaged, and the first clutch 51 is engaged, and the second brake 62 is braked. The generator 1, the engine 2, and the drive motor 3 drive the vehicle wheels 10 to rotate simultaneously. Specifically, at this time, the hybrid drive system has three transmission paths. Transmission path one: The power of the generator 1 is transmitted to the vehicle wheels 10 successively through the first shaft 11, the first clutch 51, the first gear 711, and the second gear 712. Transmission path two: The power of the engine 2 is transmitted to the vehicle wheels 10 successively through the second shaft 21, the planet carrier 41, the planet gear 43, the sun gear 42, the first shaft 11, the first clutch 51, the first gear 711, and the second gear 712. Transmission path three: The power of the drive motor 3 is transmitted to the vehicle wheels 10 successively through the third shaft 31 and the second gear 712.

[0089] As Figure 14As shown, when the hybrid drive system is in the parallel hybrid second gear mode, the second brake 62, the first clutch 51, and the third clutch 53 are all disengaged, and the first brake 61 is braked, the second clutch 52 is engaged, and the engine 2 and the drive motor 3 drive the vehicle wheels 10 to rotate simultaneously; specifically, at this time, the hybrid drive system has two transmission paths. Transmission path one: The power of the engine 2 is transmitted to the vehicle wheels 10 through the second shaft 21, the planet carrier 41, the planet gears 43, the ring gear 44, the second clutch 52, the first gear 711, and the second gear 712 in sequence; Transmission path two: The power of the drive motor 3 is transmitted to the vehicle wheels 10 through the third shaft 31 and the second gear 712 in sequence.

[0090] As Figure 15 shown, when the hybrid drive system is in the parallel hybrid third gear mode, the first brake 61, the second brake 62, and the third clutch 53 are all disengaged, and the first clutch 51 and the second clutch 52 are both engaged, and the generator 1, the engine 2, and the drive motor 3 drive the vehicle wheels 10 to rotate simultaneously; specifically, at this time, the hybrid drive system has three transmission paths. Transmission path one: The power of the generator 1 is transmitted to the vehicle wheels 10 through the first shaft 11, the first clutch 51, the first gear 711, and the second gear 712 in sequence; Transmission path two: The power of the engine 2 is transmitted to the vehicle wheels 10 through the second shaft 21, the planet carrier 41, the planet gears 43 gear mechanism (including the planet carrier 41, the planet gears 43, the sun gear 42, and the ring gear 44), the first gear 711, and the second gear 712 in sequence; Transmission path three: The power of the drive motor 3 is transmitted to the vehicle wheels 10 through the third shaft 31 and the second gear 712 in sequence.

[0091] As Figure 16As shown, when the hybrid drive system is in the parallel hybrid four-gear mode, the first brake 61, the second brake 62, and the second clutch 52 are all disengaged, and the first clutch 51 and the third clutch 53 are both engaged. The generator 1, the engine 2, and the drive motor 3 drive the vehicle wheels 10 to rotate simultaneously in the parallel hybrid four-gear mode. Specifically, at this time, the hybrid drive system has three transmission paths. Transmission path one: The power of the generator 1 is transmitted to the vehicle wheels 10 through the first shaft 11, the first clutch 51, the first gear 711, and the second gear 712 in sequence. Transmission path two: The power of the engine 2 is transmitted to the vehicle wheels 10 through the second shaft 21, the third gear 721, and the fourth gear 722 in sequence. Transmission path three: The power of the drive motor 3 is transmitted to the vehicle wheels 10 through the third shaft 31 and the second gear 712 in sequence.

[0092] In this embodiment, the hybrid drive system has four parallel hybrid modes. When the vehicle power battery is fully charged and charging is not allowed, the parallel hybrid mode can be used to provide power at low vehicle speeds and high torques.

[0093] In one embodiment, as Figure 17 shown, the hybrid drive system includes a series extended-range mode; when the hybrid drive system is in the series extended-range mode, the first brake 61, the first clutch 51, the second clutch 52, and the third clutch 53 are all disengaged, and the second clutch 52 is braked. The engine 2 drives the generator 1 to generate electricity, and the drive motor 3 drives the vehicle wheels 10 to rotate; specifically, at this time, the hybrid drive system has two transmission paths. Transmission path one: The power of the engine 2 is transmitted to the generator 1 through the second shaft 21, the planet carrier 41, the planet gears 43, the sun gear 42, and the first shaft 11 in sequence, so that the generator 1 can generate electricity. Transmission path two: The power of the drive motor 3 is transmitted to the vehicle wheels 10 through the third shaft 31 and the second gear 712 in sequence.

[0094] In one embodiment, as Figure 18As shown, the hybrid drive system has a continuously variable transmission mode; when the hybrid drive system is in the continuously variable transmission mode, the first brake 61, the first clutch 51, the second clutch 52, and the third clutch 53 are all disengaged, the second clutch 52 is braked, and the engine 2 and the drive motor 3 drive the vehicle wheels 10 to rotate simultaneously. Specifically, at this time, the hybrid drive system has two transmission paths. The power of the engine 2 is transmitted to the planetary gear mechanism 4 through the second shaft 21, the planet carrier 41, and the planet gears 43 in sequence. The power of the generator 1 is transmitted to the planetary gear mechanism 4 through the first shaft 11 and the sun gear 42. Thus, the power of the generator 1 and the power of the engine 2 are coupled in the planetary gear mechanism 4, and then transmitted to the vehicle wheels 10 through the ring gear 44, the second clutch 52, the first gear 711, and the second gear 712 in sequence. Transmission path two: The power of the drive motor 3 is transmitted to the vehicle wheels 10 through the third shaft 31 and the second gear 712 in sequence.

[0095] In this embodiment, in the series extended range mode, the generator 1 can generate electricity through the generator 1, thereby improving the utilization rate of the power of the engine 2; in the continuously variable transmission mode, the working range of the engine 2 can be adjusted through the generator 1 and the drive motor 3, decoupling the engine 2 from the vehicle's demand, and keeping the generator 1 in a relatively optimal working range.

[0096] In summary, the drive modes of the hybrid drive system are as shown in Table 1 below.

[0097] Table 1 Drive Mode Table of Hybrid Drive System

[0098]

[0099]

[0100] It should be noted that, as Figure 3 and Figure 4 shown, in the single-motor pure electric first gear mode, when the synchronizer 8 connects the fifth gear 731, the power of the drive motor 3 can be transmitted to the vehicle wheels 10 through the sixth gear 732, the fifth gear 731, the synchronizer 8, the third output shaft, and the second gear 712 in sequence; when the synchronizer 8 connects the seventh gear 741, the power of the drive motor 3 can be transmitted to the vehicle wheels 10 through the eighth gear 742, the seventh gear 741, the synchronizer 8, the third output shaft, and the second gear 712 in sequence.

[0101] Understandably, in the dual-motor pure-electric first gear mode, the dual-motor pure-electric second gear mode, the parallel hybrid first gear mode, the parallel hybrid second gear mode, the parallel hybrid third gear mode, the parallel hybrid fourth gear mode, the series extended-range mode, and the continuously variable transmission mode, the power of the drive motor 3 can be transmitted to the third output shaft through the third gear train 73, or transmitted to the third output shaft through the fourth gear train 74, and then transmitted to the vehicle wheels 10 through the second gear 712.

[0102] Understandably, the above hybrid drive system can control the switching of its drive mode according to the following method:

[0103] First, obtain the real-time vehicle speed of the vehicle, the real-time remaining power value of the vehicle power battery, and the real-time torque of the vehicle accelerator pedal.

[0104] Secondly, obtain the first comparison data between the real-time remaining power value and the preset power value, the second comparison data between the real-time vehicle speed and the preset vehicle speed, and the third comparison data between the real-time torque and the preset torque; in the present invention, different ranges can be taken for the preset power value, the preset vehicle speed value, and the preset torque value according to actual needs, and they can usually be freely set according to specific control strategies, and the values of the preset values can be different under different control strategies. Understandably, the first comparison data can represent the level of the remaining power of the vehicle power battery, the second comparison data can represent the magnitude of the real-time vehicle speed of the vehicle; the third comparison data can represent the magnitude of the driving torque required by the vehicle.

[0105] Then, determine the drive mode of the hybrid drive system according to the first comparison data, the second comparison data, and the third comparison data, and control the hybrid drive system to switch to the determined drive mode. The drive modes include but are not limited to the single-motor pure-electric first gear mode, the single-motor pure-electric second gear mode, the single-motor pure-electric third gear mode, the dual-motor pure-electric first gear mode, the dual-motor pure-electric second gear mode, the engine direct drive first gear mode, the engine direct drive second gear mode, the engine direct drive third gear mode, the engine direct drive fourth gear mode, the parallel hybrid first gear mode, the parallel hybrid second gear mode, the parallel hybrid third gear mode, the parallel hybrid fourth gear mode, the series extended-range mode, and the continuously variable transmission mode, etc. Understandably, in the present invention, when the vehicle brakes, the drive motor 3 will generate a braking torque to brake the wheels, and at the same time, an induced current will be generated in the winding of the drive motor 3, thereby realizing charging to the vehicle power battery, and thus realizing the recovery of vehicle braking energy.

[0106] Another embodiment of the present invention also provides a vehicle, including the above hybrid drive system.

[0107] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hybrid drive system, characterized in that, it includes a generator, an engine, a drive motor, a first shaft, a second shaft, a third shaft, a planetary gear mechanism, a clutch assembly, a brake assembly and a gear train assembly; the clutch assembly includes a first clutch, a second clutch and a third clutch; the generator is connected to the first shaft, the engine is connected to the second shaft, and the drive motor is connected to the third shaft; the gear train assembly includes a first gear train and a second gear train; the first gear train includes a first gear and a second gear that mesh with each other, the first gear is connected to the first shaft through the first clutch, and the second gear is connected to the third shaft; the second gear train includes a third gear and a fourth gear that mesh with each other, the third gear is connected to the second shaft, and the fourth gear is connected to the third shaft through the third clutch; the planetary gear mechanism includes a planet carrier, a sun gear, planet gears and a ring gear; the sun gear and the ring gear both mesh with the planet gears; the sun gear is connected to the first shaft, the planet carrier is connected to the second shaft, and the ring gear is connected to the first gear through the second clutch; the first shaft and the second shaft are coaxially arranged; the brake assembly includes a first brake for braking the first shaft and a second brake for braking the ring gear; the hybrid drive system has an engine direct drive mode, and the engine direct drive mode includes an engine direct drive first gear mode, an engine direct drive second gear mode, an engine direct drive third gear mode and an engine direct drive fourth gear mode; when the hybrid drive system is in the engine direct drive first gear mode, the first brake, the second clutch and the third clutch are all disengaged, and the first clutch is engaged, the second brake is braked, and the engine drives the vehicle wheels to rotate; when the hybrid drive system is in the engine direct drive second gear mode, the first clutch, the third clutch and the second brake are all disengaged, and the second clutch is engaged, the first brake is braked, and the engine drives the vehicle wheels to rotate; when the hybrid drive system is in the engine direct drive third gear mode, the first brake, the second brake and the third clutch are all disengaged, and the first clutch and the second clutch are both engaged, and the engine drives the vehicle wheels to rotate; when the hybrid drive system is in the engine direct drive fourth gear mode, the first brake, the second brake, the first clutch and the second clutch are all disengaged, and the third clutch is engaged, and the engine drives the vehicle wheels to rotate.

2. The hybrid drive system according to claim 1, characterized in that, the clutch assembly further includes a one-way clutch for braking the planet carrier; one end of the one-way clutch is connected to the vehicle body, and the other end of the one-way clutch is selectively connected to the second shaft.

3. The hybrid drive system according to claim 1, characterized in that, The gear train assembly further includes a third gear train and a fourth gear train; the third gear train includes a fifth gear and a sixth gear that mesh with each other, and the fourth gear train includes a seventh gear and an eighth gear that mesh with each other; both the fifth gear and the seventh gear are sleeved on the third shaft, and both the sixth gear and the eighth gear are connected to the output end of the drive motor; The hybrid drive system further includes a synchronizer connected to the third shaft and located between the fifth gear and the seventh gear; the synchronizer selectively connects the fifth gear and the seventh gear.

4. The hybrid drive system according to claim 1, wherein, the gear train assembly further includes a fifth gear train; the fifth gear train includes a ninth gear and a tenth gear that mesh with each other; the output end of the generator is connected to the first shaft through the ninth gear.

5. The hybrid drive system according to claim 1, wherein, the hybrid drive system further includes a differential connected to the vehicle wheels; the differential includes a differential gear that meshes with the second gear.

6. The hybrid drive system according to claim 1, wherein, the hybrid drive system has a single-motor pure electric mode, and the single-motor pure electric mode includes a single-motor pure electric first gear mode, a single-motor pure electric second gear mode, and a single-motor pure electric third gear mode; when the hybrid drive system is in the single-motor pure electric first gear mode, the first brake, the second brake, the first clutch, the second clutch, and the third clutch are all disengaged, and the drive motor drives the vehicle wheels to rotate; when the hybrid drive system is in the single-motor pure electric second gear mode, the first brake, the second brake, the second clutch, and the third clutch are all disengaged, and the first clutch is engaged, and the generator drives the vehicle wheels to rotate; when the hybrid drive system is in the single-motor pure electric third gear mode, the first brake, the second brake, the first clutch, and the third clutch are all disengaged, and the second clutch is engaged, and the generator drives the vehicle wheels to rotate.

7. The hybrid drive system according to claim 1, wherein, the hybrid drive system has a dual-motor pure electric mode, and the dual-motor pure electric mode includes a dual-motor pure electric first gear mode and a dual-motor pure electric second gear mode; when the hybrid drive system is in the dual-motor pure electric first gear mode, the first brake, the second brake, the second clutch, and the third clutch are all disengaged, and the first clutch is engaged, and the generator and the drive motor drive the vehicle wheels to rotate simultaneously; when the hybrid drive system is in the dual-motor pure electric second gear mode, the first brake, the second brake, the first clutch, and the third clutch are all disengaged, and the second clutch is engaged, and the generator and the drive motor drive the vehicle wheels to rotate simultaneously.

8. The hybrid drive system according to claim 1, wherein, The hybrid drive system has a parallel hybrid mode, and the parallel hybrid mode includes a parallel hybrid first gear mode, a parallel hybrid second gear mode, a parallel hybrid third gear mode, and a parallel hybrid fourth gear mode; When the hybrid drive system is in the parallel hybrid first gear mode, the first brake, the second clutch, and the third clutch are all disengaged, and the first clutch is engaged, the second brake is braked, and the generator, the engine, and the drive motor drive the vehicle wheels to rotate simultaneously; When the hybrid drive system is in the parallel hybrid second gear mode, the second brake, the first clutch, and the third clutch are all disengaged, and the first brake is braked, the second clutch is engaged, and the engine and the drive motor drive the vehicle wheels to rotate simultaneously; When the hybrid drive system is in the parallel hybrid third gear mode, the first brake, the second brake, and the third clutch are all disengaged, and the first clutch and the second clutch are both engaged, and the generator, the engine, and the drive motor drive the vehicle wheels to rotate simultaneously; When the hybrid drive system is in the parallel hybrid fourth gear mode, the first brake, the second brake, and the second clutch are all disengaged, and the first clutch and the third clutch are both engaged, and the generator, the engine, and the drive motor drive the vehicle wheels to rotate simultaneously.

9. The hybrid drive system according to claim 1, wherein, the hybrid drive system has a series extended range mode; when the hybrid drive system is in the series extended range mode, the first brake, the first clutch, the second clutch, and the third clutch are all disengaged, and the second clutch is braked, the engine drives the generator to generate electricity, and the drive motor drives the vehicle wheels to rotate.

10. The hybrid drive system according to claim 1, wherein, the hybrid drive system has a continuously variable transmission mode; when the hybrid drive system is in the continuously variable transmission mode, the first brake, the first clutch, the second clutch, and the third clutch are all disengaged, the second clutch is braked, and the engine and the drive motor drive the vehicle wheels to rotate simultaneously.

11. A vehicle, wherein, it includes the hybrid drive system according to any one of claims 1 to 10.

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