Hybrid systems and vehicles

Abstract

This disclosure provides a hybrid power system and a vehicle, belonging to the field of vehicle technology. The hybrid power system includes a first motor, a second motor, an engine, a first transmission mechanism, a dual planetary gear set, a first gear transmission mechanism, a second gear transmission mechanism, a first clutch, a second clutch, a first brake, a second brake, and an output shaft. The first motor is connected to the output shaft via the first transmission mechanism. The second motor and engine are connected to the first clutch via the first gear transmission mechanism, and to the second clutch via the dual planetary gear set and the second gear transmission mechanism. The first clutch and the second clutch are connected to the output shaft via the first transmission mechanism. The first clutch and the second clutch can control whether the power from the second motor and the engine can be transmitted to the output shaft, thereby enabling the switching of the power source of the hybrid power system. Furthermore, the first gear transmission mechanism and the second gear transmission mechanism have different gear ratios, thereby achieving the switching of different gears.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and in particular to a hybrid power system and vehicle. Background Technology

[0002] A hybrid power system is a crucial component of a hybrid vehicle, using both an engine and an electric motor as power sources. This allows the vehicle to operate in both gasoline and electric modes, thus achieving a balance between power and fuel economy.

[0003] In related technologies, the power source of a hybrid power system includes an engine and two electric motors. The hybrid power system can switch between different driving modes by switching between different power sources.

[0004] However, the structure of hybrid power systems in related technologies is relatively simple. With the increase in vehicle types, a single type of hybrid power system cannot be applied to different types of vehicles. Therefore, how to enrich the structure of hybrid power systems is a technical problem that needs to be solved. Summary of the Invention

[0005] This disclosure provides a hybrid power system and a vehicle that can solve the technical problems existing in the related art. The technical solution of the hybrid power system and the vehicle is as follows.

[0006] In a first aspect, this disclosure provides a hybrid power system, the hybrid power system comprising a first motor, a second motor, an engine, a first transmission mechanism, a dual planetary gear set, a first transmission mechanism, a second transmission mechanism, a first clutch, a second clutch, a first brake, a second brake, and an output shaft;

[0007] The dual planetary gear set includes a first sun gear, a first planet gear, a planet carrier, a second sun gear, and a second planet gear. The first planet gear meshes with the first sun gear, and the second planet gear meshes with the second sun gear. The first planet gear and the second planet gear are coaxially connected through the planet carrier. The first sun gear is connected to the first brake, and the second sun gear is connected to the second brake. The first brake and the second brake are fixed to the housing of the hybrid power system.

[0008] The engine is connected to the first sun gear via a transmission, and the second sun gear is coaxially connected to the second motor;

[0009] The input end of the first transmission mechanism is coaxially connected to the second motor, and the output end is coaxially connected to the first clutch. The input end of the second transmission mechanism is coaxially connected to the planetary carrier, and the output end is coaxially connected to the second clutch. The transmission ratios of the first transmission mechanism and the second transmission mechanism are different.

[0010] The first motor, the first clutch, the second clutch, and the first transmission mechanism are connected in a transmission connection. The first transmission mechanism is connected in a transmission connection with the output shaft, which is used for a transmission connection with the wheel.

[0011] In one possible implementation, the hybrid power system has a single-motor drive mode;

[0012] In the single-motor drive mode, neither the second motor nor the engine is working, and the first clutch, the second clutch, the first brake, and the second brake are all disengaged. The first motor drives the wheel through the first transmission mechanism and the output shaft.

[0013] In one possible implementation, the hybrid power system has a dual-motor drive mode;

[0014] In the dual-motor drive mode, the engine is not working, the first clutch or the second clutch is engaged, the first brake is engaged, the second brake is disengaged, the first motor drives the wheel through the first transmission mechanism and the output shaft, the second motor drives the wheel through the first clutch or the second clutch, the first transmission mechanism and the output shaft, and the first motor drives the wheel through the first transmission mechanism and the output shaft.

[0015] In one possible implementation, the dual-motor drive mode has a first gear and a second gear;

[0016] In the first gear, the first clutch is engaged, the first brake is engaged, and the second motor drives the wheel through the first transmission mechanism, the first clutch, the first transmission mechanism, and the output shaft.

[0017] In the second gear, the second clutch is engaged, the first brake is engaged, and the second motor drives the wheel through the second sun gear, the second planetary gears, the planetary carrier, the second transmission mechanism, the second clutch, the first transmission mechanism, and the output shaft.

[0018] In one possible implementation, the hybrid power system has a first hybrid mode;

[0019] In the first hybrid mode, the second clutch is engaged, and the first clutch, the first brake, and the second brake are all disengaged. The first motor drives the wheel through the first transmission mechanism and the output shaft. The second motor drives the wheel through the second sun gear, the second planet gear, the planet carrier, the second transmission mechanism, the second clutch, and the output shaft. The engine drives the wheel through the first sun gear, the first planet gear, the planet carrier, the second transmission mechanism, the second clutch, and the output shaft.

[0020] In one possible implementation, the hybrid power system has a second hybrid mode;

[0021] In the second hybrid mode, the second clutch and the second brake are engaged, the first clutch and the first brake are disengaged, the second motor is not working, the first motor drives the wheel through the first transmission mechanism and the output shaft, and the engine drives the wheel through the first sun gear, the first planetary gears, the planet carrier, the second transmission mechanism, the second clutch and the output shaft.

[0022] In one possible implementation, the diameter of the first sun gear is larger than the diameters of the first planet gear and the second sun gear;

[0023] The diameter of the second planetary gear is larger than the diameters of the first planetary gear and the second sun gear.

[0024] In one possible implementation, the first transmission mechanism includes a first gear, a second gear, and a third gear;

[0025] The first gear is connected to the output shaft of the first motor, the first gear meshes with the second gear, the third gear is coaxially connected with the second gear, and the third gear is driven by the output shaft. The diameter of the first gear is smaller than the diameter of the second gear, and the diameter of the third gear is smaller than the diameter of the second gear.

[0026] In one possible implementation, the first transmission mechanism includes a meshing fourth gear and a fifth gear, the diameter of the fourth gear being smaller than the diameter of the fifth gear, and the fourth gear, the second sun gear, and the second motor being coaxially connected.

[0027] The second transmission mechanism includes a meshing sixth gear and a seventh gear, the diameter of the sixth gear being larger than the diameter of the seventh gear, and the sixth gear being coaxially connected to the planetary carrier.

[0028] In a second aspect, this disclosure provides a vehicle that includes a hybrid power system as described in any of the first aspects.

[0029] The technical solution provided in this disclosure includes at least the following beneficial effects:

[0030] This disclosure provides a hybrid power system in which a first motor is connected to an output shaft via a first transmission mechanism, thereby driving the wheels to rotate. A second motor is connected to a first clutch via a first gearbox and to a second clutch via a double planetary gear set and a second gearbox. The first and second clutches are connected to the output shaft via the first transmission mechanism. When either the first or second clutch is engaged, the power of the second motor can be transmitted to the output shaft, thereby driving the wheels to rotate. An engine is connected to the first clutch via a double planetary gear set and a first gearbox, and to the second clutch via a second gearbox. The first and second clutches are connected to the output shaft via the first transmission mechanism. When either the first or second clutch is engaged, the engine's power can be transmitted to the output shaft, thereby driving the wheels to rotate. Simultaneously, when the first brake is engaged, the first sun gear is fixed; when the second brake is engaged, the second sun gear is fixed, allowing the double planetary gear set to transmit power. Thus, by engaging or disengaging the first clutch, second clutch, first brake, and second brake, the power source of the hybrid power system can be switched. Furthermore, because the first and second gearboxes have different transmission ratios, different gear shifts can also be achieved.

[0031] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings:

[0033] Figure 1 This is a schematic diagram of the structure of a hybrid power system shown in an embodiment of this disclosure;

[0034] Figure 2 This is a schematic diagram of power transmission in a single-motor drive mode of a hybrid power system according to an embodiment of this disclosure;

[0035] Figure 3 This is a schematic diagram of power transmission in the first gear of a hybrid power system in a dual-motor drive mode, as shown in an embodiment of this disclosure.

[0036] Figure 4 This is a schematic diagram of power transmission in the first gear of a hybrid power system in a dual-motor drive mode, as shown in an embodiment of this disclosure.

[0037] Figure 5 This is a schematic diagram of the power transmission in a first hybrid mode of a hybrid power system according to an embodiment of the present disclosure;

[0038] Figure 6 This is a schematic diagram of the power transmission in a second hybrid mode of a hybrid power system according to an embodiment of the present disclosure.

[0039] Legend:

[0040] 1. First transmission mechanism; 11. First gear; 12. Second gear; 13. Third gear;

[0041] 2. Double planetary gear set; 21. First sun gear; 22. First planetary gear; 23. Planet carrier; 24. Second sun gear; 25. Second planetary gear.

[0042] 3. First gear transmission mechanism; 31. Fourth gear; 32. Fifth gear;

[0043] 4. Second transmission mechanism; 41. Sixth gear; 42. Seventh gear;

[0044] 5. First clutch;

[0045] 6. Second clutch;

[0046] 7. First brake;

[0047] 8. Second brake;

[0048] 9. Output shaft;

[0049] 10. Differential;

[0050] 100. First motor;

[0051] 200. Second motor;

[0052] 300. Engine;

[0053] 400. Wheel.

[0054] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0056] The terminology used in the embodiments of this disclosure is for illustrative purposes only and is not intended to limit the disclosure. Unless otherwise defined, the technical or scientific terms used herein should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “a” or “one,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0057] This disclosure provides a hybrid power system, such as... Figure 1 As shown, the hybrid power system includes a first motor 100, a second motor 200, an engine 300, a first transmission mechanism 1, a double planetary gear set 2, a first transmission mechanism 3, a second transmission mechanism 4, a first clutch 5, a second clutch 6, a first brake 7, a second brake 8, and an output shaft 9. The double planetary gear set 2 includes a first sun gear 21, a first planet gear 22, a planet carrier 23, a second sun gear 24, and a second planet gear 25. The first planet gear 22 meshes with the first sun gear 21, and the second planet gear 25 meshes with the second sun gear 24. The first planet gear 22 and the second planet gear 25 are coaxially connected through the planet carrier 23. The first sun gear 21 is connected to the first brake 7, and the second sun gear 24 is connected to the second brake 8. The first brake 7 and the second brake 8 are fixed to the housing of the hybrid power system. The engine 300 is driven by the first sun gear 21, and the second sun gear 24 is coaxially connected to the second motor 200. The input end of the first transmission mechanism 3 is coaxially connected to the second motor 200, and the output end is coaxially connected to the first clutch 5. The input end of the second transmission mechanism 4 is coaxially connected to the planetary carrier 23, and the output end is coaxially connected to the second clutch 6. The transmission ratios of the first transmission mechanism 3 and the second transmission mechanism 4 are different. The first motor 100, the first clutch 5, and the second clutch 6 are connected to the first transmission mechanism 1, which is also connected to the output shaft 9. The output shaft 9 is used for the transmission connection with the wheel 400.

[0058] The output shaft of the second motor 200 is a hollow shaft, with the two ends connected to the second sun gear 24 and the first transmission mechanism 3, respectively. When the second brake 8 is engaged, the output shaft of the second motor 200, the second sun gear 24, and the first transmission mechanism 3 do not rotate. When the first brake 7 is engaged, the sun gear 21 remains stationary, and since the engine 300 is connected to the sun gear 21, the shaft of the engine 300 also does not rotate.

[0059] The hybrid system also includes a battery pack, which is electrically connected to the first motor 100 and the second motor 200, and is capable of supplying power to the first motor 100 and the second motor 200. When the first motor 100 and the second motor 200 are driven by an external force, the first motor 100 and the second motor 200 can charge the battery pack.

[0060] The technical solution provided in this disclosure embodiment includes a first motor 100 connected to an output shaft 9 via a first transmission mechanism 1, thereby driving a wheel 400 to rotate. A second motor 200 is connected to a first clutch 5 via a first gearbox 3, and to a second clutch 6 via a double planetary gear set 2 and a second gearbox 4. The first clutch 5 and the second clutch 6 are connected to the output shaft 9 via the first transmission mechanism. When either the first clutch 5 or the second clutch 6 is engaged, the power of the second motor 200 can be transmitted to the output shaft 9, thereby driving the wheel 400 to rotate. An engine 300 is connected to the first clutch 5 via a double planetary gear set 2 and a first gearbox 3, and to the second clutch 6 via a double planetary gear set 2 and a second gearbox 4. The first clutch 5 and the second clutch 6 are connected to the output shaft 9 via the first transmission mechanism. When either the first clutch 5 or the second clutch 6 is engaged, the power of the engine 300 can be transmitted to the output shaft 9, thereby driving the wheel 400 to rotate. Simultaneously, when the first brake 7 is engaged, the first sun gear 21 is fixed; when the second brake 8 is engaged, the second sun gear 24 is fixed, thus enabling the double planetary gear set 2 to transmit power normally. In this way, by engaging or disengaging the first clutch 5, the second clutch 6, the first brake 7, and the second brake 8, the power source of the hybrid power system can be switched. Furthermore, because the transmission ratios of the first transmission mechanism 3 and the second transmission mechanism 4 are different, switching between different gears can also be achieved.

[0061] In some examples, such as Figure 2 As shown, the hybrid system has a single-motor drive mode.

[0062] In single-motor drive mode, neither the second motor 200 nor the engine 300 operates. The first clutch 5, the second clutch 6, the first brake 7, and the second brake 8 are all disengaged. The first motor 100 drives the wheels 400 through the first transmission mechanism 1 and the output shaft 9. At this time, the power source of the hybrid system is only the first motor 100. Therefore, the single-motor drive mode is suitable for vehicle start-up, low-speed driving, and when the vehicle has sufficient battery power. It can avoid the energy loss caused by frequent start-stop of the engine 300, thereby improving fuel efficiency.

[0063] For example, the single-motor drive mode also has a reversing mode and an energy recovery mode.

[0064] In reverse mode, the first motor 100 reverses, causing the first transmission mechanism 1 and output shaft 9 to drive the wheel 400 to reverse, thereby realizing reversing.

[0065] Under energy recovery conditions, the wheel 400 decelerates and drives the first motor 100 through the output shaft 9 and the first transmission mechanism 1, so that the first motor 100 can convert the vehicle's kinetic energy into electrical energy through negative torque, thereby charging the battery pack.

[0066] In some examples, such as Figure 3 and Figure 4 As shown, the hybrid system has a dual-motor drive mode.

[0067] In dual-motor drive mode, engine 300 is not operating, first clutch 5 or second clutch 6 is engaged, first brake 7 is engaged, and second brake 8 is disengaged. First motor 100 drives wheel 400 through first transmission mechanism 1 and output shaft 9. Second motor 200 drives wheel 400 through first clutch 5 or second clutch 6, first transmission mechanism 1, and output shaft 9. The power of first motor 100 and second motor 200 is coupled at first transmission mechanism 1. Compared to single-motor drive mode, dual-motor drive mode offers higher power. Dual-motor drive mode is suitable for vehicles with sufficient battery power and operating at medium to high speeds.

[0068] Since the output shaft of the second motor 200 is also connected to the second sun gear 24, when the second motor 200 rotates, it drives the second planetary gear 25 to rotate. The second planetary gear 25 transmits power to the first planetary gear 21 through the planet carrier 23. Because the first brake 7 is engaged, the first sun gear 21 is fixed, and the shaft of the engine 300 is also fixed. This avoids dragging the engine 300 when the second motor 200 rotates.

[0069] For example, the dual-motor drive mode and the single-motor drive mode also have a reversing mode and an energy recovery mode.

[0070] In the reversing mode, the first motor 100 and the second motor 200 reverse each other, and the power of the first motor 100 and the second motor 200 is coupled at the first transmission mechanism 1, so that the first transmission mechanism 1 and the output shaft 9 drive the wheel 400 to reverse.

[0071] Under energy recovery conditions, the wheel 400 decelerates and drives the first motor 100 and the second motor 200 through the first transmission mechanism 1, so that the first motor 100 and the second motor 200 can convert the vehicle's kinetic energy into electrical energy through negative torque, thereby charging the battery pack.

[0072] In some examples, the dual-motor drive mode has a first gear and a second gear.

[0073] In first gear, such as Figure 3 As shown, the first clutch 5 is engaged, and the first brake 7 is engaged. The second motor 200 drives the wheel 400 through the first transmission mechanism 3, the first clutch 5, the first transmission mechanism 1, and the output shaft 9.

[0074] In second gear, such as Figure 4 As shown, the second clutch 6 is engaged, and the first brake 7 is engaged. The second motor 200 drives the wheel 400 through the second sun gear 24, the second planetary gear 25, the planetary carrier 23, the second transmission mechanism 4, the second clutch 6, the first transmission mechanism 1, and the output shaft 9.

[0075] Because the transmission ratios of the first gear transmission mechanism 3 and the second gear transmission mechanism 4 are different, the output speeds of the first gear and the second gear are different, even though the first motor 100 outputs the same speed and the second motor 200 output the same speed.

[0076] In some examples, such as Figure 5 As shown, the hybrid system has a first hybrid mode.

[0077] In the first hybrid mode, the second clutch 6 engages, while the first clutch 5, first brake 7, and second brake 8 disengage. The first motor 100, second motor 200, and engine 300 all operate. The first motor 100 drives the wheels 400 via the first transmission mechanism 1 and output shaft 9. The second motor 200 drives the wheels 400 via the second sun gear 24, second planetary gears 25, planetary carrier 23, second transmission mechanism 4, second clutch 6, and output shaft 9. The engine 300 drives the wheels 400 via the first sun gear 21, first planetary gears 22, planetary carrier 23, second transmission mechanism 4, second clutch 6, and output shaft 9. This allows the wheels 400 to be driven jointly by the first motor 100, second motor 200, and engine 300, enabling them to receive greater power and improving vehicle performance. Therefore, the parallel drive mode is suitable for high-speed driving conditions.

[0078] In this design, the power of the second motor 200 and the engine 300 is coupled at the planetary carrier 23. The dual planetary gear set 2 can distribute the power between the second motor 200 and the engine 300, thereby achieving stepless speed regulation. Furthermore, the dual planetary gear set 2 can decouple the engine 300 from the wheels 400, allowing the engine 300 to operate in its high-efficiency range, resulting in lower fuel consumption.

[0079] In some examples, such as Figure 6 As shown, the hybrid system has a second hybrid mode.

[0080] In the second hybrid mode, the second clutch 6 and the second brake 8 are both engaged, while the first clutch 5 and the first brake 7 are both disengaged, and the second motor 200 is not operating. The first motor 100 drives the wheels 400 through the first transmission mechanism 1 and the output shaft 9, and the engine 300 drives the wheels 400 through the first sun gear 21, the first planetary gears 22, the planet carrier 23, the second transmission mechanism 4, the second clutch 6, and the output shaft 9.

[0081] In this configuration, because the second brake 8 is engaged, the second sun gear 24 is fixed, and the first transmission mechanism 3 cannot rotate. This means that the power of the dual planetary gear set 2 can only be transmitted to the wheels 400 through the second transmission mechanism 4. Therefore, in the second hybrid mode, the hybrid system has only one gear.

[0082] In some examples, such as Figure 1 As shown, the diameter of the first sun gear 21 is larger than the diameter of the first planet gear 22 and the second sun gear 24, and the diameter of the second planet gear 25 is larger than the diameter of the first planet gear 22 and the second sun gear 24. This makes the transmission ratio of the first sun gear 21 and the first planet gear 22 different from the transmission ratio of the second sun gear 24 and the second planet gear 25.

[0083] In some examples, such as Figure 1 As shown, the first transmission mechanism 1 includes a first gear 11, a second gear 12, and a third gear 13. The first gear 11 is connected to the output shaft of the first motor 100, and the first gear 11 meshes with the second gear 12. The third gear 13 is coaxially connected with the second gear 12 and is drively connected to the output shaft 9. The diameter of the first gear 11 is smaller than the diameter of the second gear 12, and the diameter of the third gear 13 is smaller than the diameter of the second gear 12.

[0084] The first transmission mechanism 1 can be considered as a reduction mechanism. Since the diameter of the first gear 11 is smaller than the diameter of the second gear 12, the rotational speed of the second gear 12 is lower than that of the first gear 11. Since the third gear 13 is coaxially connected to the second gear 12, the third gear 13 rotates at the same speed as the second gear 12. Because the diameter of the third gear 13 is smaller than that of the second gear 12, the connection between the third gear 13 and the output shaft 9 reduces the rotational speed of the output shaft 9 compared to the direct connection of the second gear 12 to the output shaft 9. This increases the torque of the output shaft 9, which is beneficial for driving the wheels 400.

[0085] In some examples, such as Figure 1 As shown, the first speed-changing mechanism 3 includes a meshing fourth gear 31 and a fifth gear 32. The diameter of the fourth gear 31 is smaller than the diameter of the fifth gear 32, so the rotational speed of the fifth gear 32 is less than the rotational speed of the fourth gear 31. The fourth gear 31, the second sun gear 24, and the second motor 200 are coaxially connected. The first speed-changing mechanism 3 is used to reduce the rotational speed of the second motor 200 or the second sun gear 24.

[0086] The second speed change mechanism 4 includes a meshing sixth gear 41 and a seventh gear 42. The diameter of the sixth gear 41 is larger than the diameter of the seventh gear 42, so the rotational speed of the seventh gear 42 is greater than the rotational speed of the sixth gear 41. The sixth gear 41 is coaxially connected to the planet carrier 23. The second speed change mechanism 4 is used to accelerate the rotational speed of the second motor 200 or the second sun gear 24.

[0087] The fourth gear 31 and the second sun gear 24 are coaxially connected through the output shaft of the second motor 200. The output shaft of the second motor 200 is a hollow shaft, which is used to encircle the connecting shaft between the sixth gear 41 and the planet carrier 23.

[0088] In some examples, such as Figure 1 As shown, the engine 300 and the first sun gear 21 are connected by a pair of parallel shaft gears. Furthermore, the two gears are used to achieve acceleration between the engine 300 and the first sun gear 21.

[0089] In some examples, such as Figure 1 As shown, the hybrid system also includes a differential 10. The differential 10 meshes with the third gear 13 and is drive-connected to the output shaft 9. When the vehicle turns, the differential 10 allows the two wheels 400 to rotate at different speeds, thus enabling the vehicle to turn smoothly.

[0090] In some examples, the first clutch 5 and the second clutch 6 form a dual clutch, sharing a common housing, which is coaxially connected to the third gear 13. Therefore, whether the first clutch 5 or the second clutch 6 is engaged, power can be transmitted to the housing and then to the third gear 13.

[0091] This disclosure also provides a vehicle that includes the aforementioned hybrid power system.

[0092] This disclosure does not specifically limit the type of vehicle, such as cars, buses, trucks, sport utility vehicles (SUVs), etc.

[0093] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A hybrid power system, characterized in that, The hybrid power system includes a first motor (100), a second motor (200), an engine (300), a first transmission mechanism (1), a double planetary gearbox (2), a first transmission mechanism (3), a second transmission mechanism (4), a first clutch (5), a second clutch (6), a first brake (7), a second brake (8), and an output shaft (9). The first transmission mechanism (1) includes a first gear (11), a second gear (12) and a third gear (13). The first gear (11) is connected to the output shaft of the first motor (100). The first gear (11) and the second gear (12) mesh. The third gear (13) is coaxially connected to the second gear (12). The diameter of the first gear (11) is smaller than the diameter of the second gear (12). The diameter of the third gear (13) is smaller than the diameter of the second gear (12). The dual planetary gear set (2) includes a first sun gear (21), a first planet gear (22), a planet carrier (23), a second sun gear (24), and a second planet gear (25). The first planet gear (22) meshes with the first sun gear (21), and the second planet gear (25) meshes with the second sun gear (24). The first planet gear (22) and the second planet gear (25) are coaxially connected through the planet carrier (23). The first sun gear (21) is connected to the first brake (7), and the second sun gear (24) is connected to the second brake (8). The first brake (7) and the second brake (8) are fixed to the housing of the hybrid power system. The engine (300) is connected to the first sun gear (21) via a transmission, and the second sun gear (24) is coaxially connected to the second motor (200); The input end of the first speed change mechanism (3) is coaxially connected to the second motor (200), and the output end is coaxially connected to the first clutch (5). The input end of the second speed change mechanism (4) is coaxially connected to the planetary carrier (23), and the output end is coaxially connected to the second clutch (6). The transmission ratios of the first speed change mechanism (3) and the second speed change mechanism (4) are different. The first motor (100), the first clutch (5), the second clutch (6) are connected to the third gear (13) in a transmission connection. The third gear (13) is connected to the output shaft (9) in a transmission connection. The output shaft (9) is used to be connected to the wheel (400) in a transmission connection.

2. The hybrid power system according to claim 1, characterized in that, The hybrid power system has a single-motor drive mode. In the single-motor drive mode, neither the second motor (200) nor the engine (300) is working. The first clutch (5), the second clutch (6), the first brake (7), and the second brake (8) are all disengaged. The first motor (100) drives the wheel (400) through the first transmission mechanism (1) and the output shaft (9).

3. The hybrid power system according to claim 1, characterized in that, The hybrid power system has a dual-motor drive mode; In the dual-motor drive mode, the engine (300) is not working, the first clutch (5) or the second clutch (6) is engaged, the first brake (7) is engaged, the second brake (8) is disengaged, and the first motor (100) drives the wheel (400) through the first transmission mechanism (1) and the output shaft (9). The second motor (200) drives the wheel (400) via the first clutch (5) or the second clutch (6), the first transmission mechanism (1) and the output shaft (9).

4. The hybrid power system according to claim 3, characterized in that, The dual-motor drive mode has a first gear and a second gear; In the first gear, the first clutch (5) is engaged, and the second motor (200) drives the wheel (400) through the first transmission mechanism (3), the first clutch (5), the first transmission mechanism (1) and the output shaft (9); In the second gear, the second clutch (6) is engaged, and the second motor (200) drives the wheel (400) through the second sun gear (24), the second planetary gear (25), the planet carrier (23), the second transmission mechanism (4), the second clutch (6), the first transmission mechanism (1) and the output shaft (9).

5. The hybrid power system according to claim 1, characterized in that, The hybrid power system has a first hybrid mode; In the first hybrid mode, the second clutch (6) is engaged, and the first clutch (5), the first brake (7), and the second brake (8) are disengaged. The first motor (100) drives the wheel (400) through the first transmission mechanism (1) and the output shaft (9). The second motor (200) drives the wheel (400) through the second sun gear (24), the second planetary gear (25), the planet carrier (23), the second transmission mechanism (4), the second clutch (6), and the output shaft (9). The engine (300) drives the wheel (400) through the first sun gear (21), the first planetary gear (22), the planet carrier (23), the second transmission mechanism (4), the second clutch (6), and the output shaft (9).

6. The hybrid power system according to claim 1, characterized in that, The hybrid power system has a second hybrid mode; In the second hybrid mode, the second clutch (6) and the second brake (8) are engaged, the first clutch (5) and the first brake (7) are disengaged, the second motor (200) is not working, the first motor (100) drives the wheel (400) through the first transmission mechanism (1) and the output shaft (9), and the engine (300) drives the wheel (400) through the first sun gear (21), the first planetary gear (22), the planet carrier (23), the second transmission mechanism (4), the second clutch (6) and the output shaft (9).

7. The hybrid power system according to any one of claims 1-6, characterized in that, The diameter of the first sun gear (21) is larger than the diameters of the first planet gear (22) and the second sun gear (24); The diameter of the second planetary gear (25) is larger than the diameter of the first planetary gear (22) and the second sun gear (24).

8. The hybrid power system according to any one of claims 1-6, characterized in that, The first transmission mechanism (3) includes a meshing fourth gear (31) and a fifth gear (32), the diameter of the fourth gear (31) is smaller than the diameter of the fifth gear (32), and the fourth gear (31), the second sun gear (24) and the second motor (200) are coaxially connected; The second transmission mechanism (4) includes a meshing sixth gear (41) and a seventh gear (42), the diameter of the sixth gear (41) being larger than the diameter of the seventh gear (42), and the sixth gear (41) and the planetary carrier (23) being coaxially connected.

9. A vehicle, characterized in that, The vehicle includes a hybrid power system as described in any one of claims 1-8.

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