Hybrid drive system

Abstract

A hybrid drive system comprises an engine, a first motor, a second motor, a planetary gear device, a clutch gear device, an engaging device and a switching device, the engine and the first motor are connected with the planetary gear device, the clutch gear device is arranged between the first motor and the planetary gear device; the planetary gear device comprises a first rotating element, a second rotating element and a third rotating element, the first rotating element is connected with the first motor, the second rotating element is connected with the engine, and the third rotating element is connected with the engaging device; the clutch gear device comprises a clutch, a clutch gear connected with the clutch and an engaging element, the clutch gear is connected to an output end; the engaging device engages the third rotating element with the engaging element, or engages the third rotating element with the switching device, or only engages the third rotating element; the switching device locks or unlocks the third rotating element; the second motor is connected to the output end. The hybrid drive system platform of the application is good.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to a hybrid power drive system. Background Technology

[0002] Currently, transmissions on the market are mainly divided into two categories: stepped transmissions (TVTs) and continuously variable transmissions (CVTs). Stepped transmissions are further subdivided into manual and automatic types. They mostly provide a finite number of discrete input-output speed ratios through different meshing arrangements of gear trains or planetary gear trains. The adjustment of the drive wheel speed between two adjacent speed ratios is achieved by changing the speed of the internal combustion engine. CVTs, whether mechanical, hydraulic, or electromechanical, can provide an infinite number of continuously selectable speed ratios within a certain speed range. Theoretically, the speed change of the drive wheels can be completely accomplished by the transmission. In this way, the internal combustion engine can operate within its optimal speed range as much as possible. Furthermore, compared to stepped transmissions, CVTs have many advantages, such as smooth speed regulation and the ability to fully utilize the maximum power of the internal combustion engine. Therefore, CVTs have been a research focus for engineers worldwide for many years.

[0003] In recent years, the emergence of electric motor hybrid technology has opened up new avenues for achieving complete power matching between the internal combustion engine and the drive wheels. Among the numerous powertrain design schemes, the most representative are the series hybrid system and the parallel hybrid system. In the series hybrid system, the internal combustion engine, generator, electric motor, shaft system, and drive wheels form a series power chain, resulting in an extremely simple powertrain structure. The generator and electric motor combination can be considered a traditional transmission. When used in conjunction with energy storage devices such as batteries and capacitors, this transmission can also function as an energy regulation device, independently adjusting speed and torque.

[0004] A parallel electric motor system has two parallel and independent power chains. One consists of a traditional mechanical transmission, and the other consists of a motor and battery system. The mechanical transmission is responsible for speed regulation, while the motor and battery system regulates power or torque. To fully utilize the potential of the entire system, the mechanical transmission also needs to employ a continuously variable transmission (CVT).

[0005] The advantages of series hybrid systems lie in their simple structure and flexible layout. However, all power is supplied through generators and motors, resulting in high motor power requirements, large size, and heavy weight. Furthermore, due to the two electromechanical conversions during energy transfer, the overall system efficiency is relatively low. In parallel hybrid systems, only a portion of the power is supplied through the motor system; therefore, the power requirements for the motors are relatively lower, and the overall system efficiency is high. However, this system requires two independent subsystems, leading to higher costs. It is typically only used in weakly hybrid systems. Summary of the Invention

[0006] In view of this, the present invention provides a hybrid power drive system with multiple operating modes and good platform integration.

[0007] A hybrid drive system includes an engine, a first motor, a second motor, a planetary gear assembly, a clutch gear assembly, an engagement device, and a switching device. Both the engine and the first motor are connected to the planetary gear assembly. The clutch gear assembly is disposed between the first motor and the planetary gear assembly. The planetary gear assembly includes a first rotating element, a second rotating element, and a third rotating element. The first rotating element is connected to the first motor, the second rotating element is connected to the engine, and the third rotating element is connected to the engagement device. The clutch gear assembly includes a clutch, a clutch gear connected to the clutch, and an engagement element. The clutch gear is connected to an output end. The engagement device engages the third rotating element and the engagement element, or engages the third rotating element and the switching device, or engages only the third rotating element. The switching device locks or unlocks the third rotating element. The second motor is arranged parallel to the first motor and is connected to the output end.

[0008] In an embodiment of the present invention, the engagement device includes a first working position, a second working position, and a third working position. In the first working position, the engagement device engages and fixes the third rotating element and the engagement element. In the second working position, the engagement device engages only the third rotating element. In the third working position, the engagement device engages and fixes the third rotating element and the switching device.

[0009] In an embodiment of the present invention, the first motor includes a first motor output shaft, the clutch gear device is disposed on the first motor output shaft, the clutch is connected to the first motor output shaft, the clutch gear is loosely fitted on the first motor output shaft, and the engagement element is fixed to the clutch and parallel to the clutch gear.

[0010] In an embodiment of the present invention, the first motor, clutch gear assembly, planetary gear assembly, and engine are arranged coaxially.

[0011] In an embodiment of the present invention, the first rotating element is a sun gear, the second rotating element is a planet carrier, the third rotating element is a ring gear, the engagement device is a synchronizer, the switching device is a brake or a one-way clutch, and the clutch gear is a first gear.

[0012] The engine has an engine output shaft, the first motor has a first motor output shaft, the planetary carrier is connected to the engine output shaft, the sun gear is connected to the first motor output shaft, and the first gear is loosely fitted on the first motor output shaft;

[0013] When the clutch is in operation, it fixes the first gear onto the output shaft of the first motor.

[0014] The brake or one-way clutch brakes or unlocks the gear ring;

[0015] The synchronizer includes a left station, a middle station, and a right station. When the synchronizer is in the left station, the gear ring engages with the engagement element. When the synchronizer is in the right station, the brake or one-way clutch brakes the gear ring. When the synchronizer is in the middle station, the gear ring separates from the engagement element, and the brake or one-way clutch unlocks the gear ring.

[0016] The hybrid drive system also includes an intermediate shaft, on which a second gear is provided, and the second gear meshes with the first gear.

[0017] The second motor has a second motor output shaft, and a third gear is provided on the second motor output shaft, the third gear meshing with the second gear.

[0018] In an embodiment of the present invention, the above-mentioned hybrid drive system further includes a differential, on which a differential gear is provided, and a fourth gear is provided on the intermediate shaft, the fourth gear meshing with the differential gear.

[0019] In embodiments of the present invention, the hybrid drive system described above has a first-level pure electric mode, a second-level pure electric mode, a range-extending mode, a first-level engine direct drive mode, a second-level engine direct drive mode, a first-level hybrid mode, a second-level hybrid mode, a third-level hybrid mode, and a parking power generation mode.

[0020] In an embodiment of the present invention, in the first-level pure electric mode, the clutch is not working, the synchronizer is in the intermediate position, the engine and the first motor are not working, and the second motor is driving; in the second-level pure electric mode, the clutch is working, the clutch fixes the first gear on the output shaft of the first motor, the synchronizer is in the intermediate position, the engine is not working, and both the first motor and the second motor are driving.

[0021] In an embodiment of the present invention, in the range-extending mode, the synchronizer is in the right position, the brake or one-way clutch brakes the gear ring, the engine drives the first motor to generate electricity, the first motor provides electrical energy to the second motor, and the second motor drives the engine.

[0022] In an embodiment of the present invention, in the first-stage engine direct drive mode, the clutch is engaged, fixing the first gear on the output shaft of the first motor, the synchronizer is in the left position, the gear ring engages with the engagement element, the engine is driven, and neither the first motor nor the second motor is engaged; in the second-stage engine direct drive mode, the clutch is engaged, fixing the first gear on the output shaft of the first motor, the synchronizer is in the right position, the brake or one-way clutch brakes the gear ring, the engine is driven, and neither the first motor nor the second motor is engaged.

[0023] In an embodiment of the present invention, in the first-level hybrid mode, the clutch is not engaged, the synchronizer is in the left position, the gear ring is engaged with the engagement element, the engine drives the planetary carrier to rotate, the first motor drives the sun gear to rotate, the engine and the first motor are continuously coupled through the planetary gear assembly, and the second motor is driven; in the second-level hybrid mode, the clutch is engaged, the clutch fixes the first gear on the output shaft of the first motor, the synchronizer is in the left position, the gear ring is engaged with the engagement element, and the engine, the first motor, and the second motor are all driven; in the third-level hybrid mode, the clutch is engaged, the clutch fixes the first gear on the output shaft of the first motor, the synchronizer is in the right position, the brake brakes the gear ring, and the engine, the first motor, and the second motor are driven.

[0024] In an embodiment of the present invention, in the parking power generation mode, the clutch is not working, the synchronizer is in the intermediate position, the engine and the first motor are not working, and the power is transmitted from the wheel end to the second motor for power generation.

[0025] In an embodiment of the present invention, the first rotating element is a sun gear, the second rotating element is a ring gear, the third rotating element is a planet carrier, the engagement device is a synchronizer, and the switching device is a brake or a one-way clutch.

[0026] In an embodiment of the present invention, the first rotating element is a planetary carrier, the second rotating element is one of a sun gear and a ring gear, the third rotating element is the other of a sun gear and a ring gear, the engagement device is a synchronizer, and the switching device is a brake or a one-way clutch.

[0027] In an embodiment of the present invention, the first rotating element is a gear ring, the second rotating element is one of a sun gear and a planet carrier, the third rotating element is the other of a sun gear and a planet carrier, the engagement device is a synchronizer, and the switching device is a brake or a one-way clutch.

[0028] In the hybrid drive system of this invention, both the engine and the first motor are connected to a planetary gear assembly, and a clutch gear assembly is disposed between the first motor and the planetary gear assembly. The planetary gear assembly includes a first rotating element, a second rotating element, and a third rotating element. The first rotating element is connected to the first motor, the second rotating element is connected to the engine, and the third rotating element is connected to an engagement device. The clutch gear assembly includes a clutch, a clutch gear connected to the clutch, and an engagement element. The clutch gear is connected to the output end. The engagement device engages the third rotating element and the engagement element, or engages the third rotating element and a switching device, or engages only the third rotating element. The switching device locks or unlocks the third rotating element. The second motor is arranged parallel to the first motor and is connected to the output end. The hybrid drive system of this invention can operate in first-level pure electric mode, second-level pure electric mode, range-extended mode, first-level engine direct drive mode, second-level engine direct drive mode, first-level hybrid mode, second-level hybrid mode, third-level hybrid mode, and parking generator mode, exhibiting strong flexibility. Moreover, the engine and the first motor are connected via a planetary gear assembly, allowing for adjustable speed ratios over a wide range, which effectively reduces the size of the first motor. Furthermore, when switching modes, the second motor in the hybrid drive system of this invention participates in the drive, ensuring no power interruption. Also, the hybrid drive system of this invention can cover both HEV and PHEV models, demonstrating good platform compatibility. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the hybrid drive system according to the first embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the power transmission of the hybrid drive system in the first embodiment of the present invention in the first-level pure electric mode.

[0031] Figure 3 This is a schematic diagram of the power transmission of the hybrid drive system in the second-level pure electric mode according to the first embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the power transmission of the hybrid drive system in range-extending mode according to the first embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of power transmission in the direct drive mode of the first-stage engine of the hybrid drive system according to the first embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of power transmission in the direct drive mode of the hybrid drive system of the first embodiment of the present invention in the second-stage engine mode.

[0035] Figure 7This is a schematic diagram of the power transmission of the hybrid drive system in the first-level hybrid mode according to the first embodiment of the present invention.

[0036] Figure 8 This is a schematic diagram of the power transmission of the hybrid drive system in the second-level hybrid mode according to the first embodiment of the present invention.

[0037] Figure 9 This is a schematic diagram of the power transmission of the hybrid drive system in the three-level hybrid mode according to the first embodiment of the present invention.

[0038] Figure 10 This is a schematic diagram of the power transmission of the hybrid drive system in the parking power generation mode according to the first embodiment of the present invention.

[0039] Figure 11 This is a schematic diagram of the hybrid drive system according to the second embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0041] First Embodiment

[0042] Figure 1 This is a schematic diagram of the hybrid power drive system according to the first embodiment of the present invention. Figure 1 As shown, the hybrid drive system 10 includes an engine 11, a planetary gear assembly 12, a first motor 13, a clutch gear assembly, a switching device, an engagement device, an intermediate shaft 17, a second motor 18, a differential 19, and a power battery (not shown).

[0043] The engine 11 has an engine output shaft 112. In this embodiment, the engine 11 is, for example, a gasoline engine or a diesel engine.

[0044] The planetary gear assembly 12 includes a first rotating element, a second rotating element, and a third rotating element. The first rotating element is connected to a first motor 13, the second rotating element is connected to an engine 11, and the third rotating element is connected to a coupling device 16. In this embodiment, the first rotating element 122 is, for example, a sun gear 122, the second rotating element is, for example, a planet carrier 124, and the third rotating element is, for example, a ring gear 123. Planet gears 125 are mounted on the planet carrier 124, and the planet gears 125 are connected to the planet carrier 124 via rolling or sliding bearings; the planet carrier 124 is connected to the engine output shaft 112. The sun gear 122 is disposed within the ring gear 123, and the sun gear 122 meshes with both the planet gears 125 and the ring gear 123.

[0045] The first motor 13 has a first motor output shaft 132, which is connected to a sun gear 122. A first gear 133 is loosely fitted onto the first motor output shaft 132. The first gear 133 is loosely fitted onto the first motor output shaft 132, meaning that the rotation of the first motor output shaft 132 and the first gear 133 is independent of each other. The first motor 13 is coaxially arranged with the engine 11, meaning that the first motor output shaft 132 of the first motor 13 and the engine output shaft 112 of the engine 11 are on the same axis. In this embodiment, the first motor 13 is an integrated drive and generator.

[0046] The clutch gear assembly is coaxially arranged with the first motor 13, the planetary gear assembly 12, and the engine 11. The clutch gear assembly includes a clutch 14, a clutch gear connected to the clutch 14, and an engagement element. The clutch gear is connected to the output end. The clutch gear assembly is mounted on the output shaft 132 of the first motor. The clutch 14 is connected to the output shaft 132 of the first motor, and the clutch gear is loosely fitted on the output shaft 132 of the first motor. The engagement element is fixed to the clutch 14 and parallel to the clutch gear. The clutch gear and the engagement element can rotate synchronously. In this embodiment, the clutch gear is, for example, a first gear 133. When the clutch 14 is engaged, the clutch 14 fixes the first gear 133 (clutch gear) on the output shaft 132 of the first motor, and the first gear 133 can rotate synchronously with the output shaft 132 of the first motor. When the clutch 14 is not engaged, the first gear 133 (clutch gear) is loosely fitted on the output shaft 132 of the first motor.

[0047] A switching device is used to lock or unlock the gear ring 123 (the third rotating element). In this embodiment, the switching device is, for example, a brake 15 or a one-way clutch. The brake 15 is used to brake or unlock the gear ring 123. When the brake 15 is engaged, the brake 15 brakes the gear ring 123; when the brake 15 is not engaged, the brake 15 unlocks the gear ring 123.

[0048] The engagement device engages the third rotating element with the engagement element, or engages the third rotating element with the switching device, or engages only the third rotating element. Specifically, the engagement device includes a first working position, a second working position, and a third working position. In the first working position, the engagement device engages and fixes the third rotating element with the engagement element; in the second working position, the engagement device engages only the third rotating element; and in the third working position, the engagement device engages and fixes the third rotating element with the switching device. In this embodiment, the engagement device is, for example, a synchronizer 16, which includes a left station, a middle station, and a right station. The left station is the first working position of the engagement device, the middle station is the second working position, and the right station is the third working position. The synchronizer 16 is fixed on the gear ring 123. When the synchronizer 16 is in the left station, the gear ring 123 engages with the engagement element; when the synchronizer 16 is in the right station, the brake 15 brakes the gear ring 123; when the synchronizer 16 is in the middle station, the gear ring 123 disengages from the engagement element, and the brake 15 or a one-way clutch unlocks the gear ring 123.

[0049] The intermediate shaft 17 is provided with a second gear 172 and a fourth gear 173, which are spaced apart from each other. The second gear 172 meshes with the first gear 133.

[0050] The second motor 18 is arranged parallel to the first motor 13 and is connected to the output end. Specifically, the second motor 18 has a second motor output shaft 182, on which a third gear 183 is provided, and the third gear 183 meshes with the second gear 172. In this embodiment, the second motor 18 is an integrated drive and generator.

[0051] The differential 19 is equipped with a differential gear 192, which meshes with the fourth gear 173. In this embodiment, the differential 19 is used to adjust the speed difference between the left and right wheels. When the car is turning or driving on an uneven road surface, the left and right wheels roll at different speeds to ensure that the drive wheels on both sides perform pure rolling motion.

[0052] The power battery is electrically connected to the first motor 13 and the second motor 18, respectively. The power battery provides electrical energy for driving the first motor 13 and the second motor 18, and the electrical energy generated by the rotation of the first motor 13 and the second motor 18 can be stored in the power battery. In this embodiment, the engine 11 drives the first motor 13 to rotate and generate electrical energy through the planetary carrier 124 and the sun gear 122, and this electrical energy can be stored in the power battery; when the car brakes, the power is transmitted from the wheel end through the differential 19, differential gear 192, fourth gear 173, second gear 172, and third gear 183 to the second motor 18, driving the second motor 18 to rotate and generate electrical energy, which can be stored in the power battery.

[0053] The hybrid drive system 10 of the present invention has a first-level pure electric mode, a second-level pure electric mode, a range-extending mode, a first-level engine direct drive mode, a second-level engine direct drive mode, a first-level hybrid mode, a second-level hybrid mode, a third-level hybrid mode, and a parking power generation mode.

[0054] Figure 2 This is a schematic diagram of the power transmission of the hybrid drive system of the first embodiment of the present invention in primary pure electric mode. Figure 2 As shown in the figure, the power transmission direction is indicated by the arrow. In the first-level pure electric mode, the clutch 14 is not engaged, the synchronizer 16 is in the intermediate position, the engine 11 and the first motor 13 are not engaged, and the second motor 18 is driven. In this embodiment, the power transmission has one path, that is, from the second motor 18 through the third gear 183 to the second gear 172, the intermediate shaft 17, the fourth gear 173, the differential gear 192, the differential 19, and finally to the wheel end. It is worth mentioning that when the car is traveling at low to medium speeds, the hybrid drive system 10 can be driven in the first-level pure electric mode.

[0055] Figure 3 This is a schematic diagram of the power transmission of the hybrid drive system in the second-level pure electric mode according to the first embodiment of the present invention. Figure 3 As shown in the figure, the power transmission direction is indicated by the arrow. In the secondary pure electric mode, clutch 14 is engaged, fixing the first gear 133 onto the output shaft 132 of the first motor. Synchronizer 16 is in the intermediate position, and both the first motor 13 and the second motor 18 are driven. In this embodiment, power transmission has two paths. Path one involves the first motor 13 transmitting power from the first motor 13 to the intermediate shaft 17 via the first gear 133, then through the fourth gear 173, differential gear 192, and differential 19, finally reaching the wheel end. Path two involves the second motor 18 transmitting power from the second motor 18 to the second gear 172 via the third gear 183, then through the intermediate shaft 17, the fourth gear 173, differential gear 192, and differential 19, finally reaching the wheel end. It is worth mentioning that when the vehicle is traveling at high speed, the hybrid drive system 10 can operate in the secondary pure electric mode.

[0056] Figure 4 This is a schematic diagram of the power transmission of the hybrid drive system in range-extended mode according to the first embodiment of the present invention. Figure 4As shown in the figure, the power transmission direction is indicated by the arrow. In range-extending mode, synchronizer 16 is in the right position, brake 15 or one-way clutch brakes gear ring 123, engine 11 drives first motor 13 to generate electricity, first motor 13 provides electrical energy to second motor 18, and second motor 18 drives. Engine 11 drives planetary carrier 124, transmitting power to sun gear 122, and then to first motor 13, causing first motor 13 to rotate and generate electricity. The electrical energy generated by first motor 13 is stored in power battery, and power battery provides electrical energy for second motor 18. In this embodiment, the power transmission has one path, from second motor 18 through third gear 183 to second gear 172, intermediate shaft 17, fourth gear 173, differential gear 192, differential 19, and finally to the wheel end.

[0057] Figure 5 This is a schematic diagram of power transmission in the first-stage engine direct-drive mode of the hybrid drive system of the present invention, according to the first embodiment. Figure 5 As shown in the figure, the power transmission direction is indicated by the arrow. In the first-stage engine direct drive mode, clutch 14 is engaged, fixing the first gear 133 onto the first motor output shaft 132. Synchronizer 16 is in the left position, and ring gear 123 engages with the engagement element. Engine 11 drives the system, while the first motor 13 and the second motor 18 are not operating. In this embodiment, the power transmission has a single path, with engine 11 driving the entire planetary gear set 12 to rotate. The speed ratio of the entire planetary gear set 12 is 1, at which point the sun gear 122, planet carrier 124, and ring gear 123 rotate at the same speed. Power is transmitted from the first gear 133 to the intermediate shaft 17, then through the fourth gear 173, differential gear 192, and differential 19, finally reaching the wheel ends. It is worth mentioning that when the vehicle is traveling at low to medium speeds, the hybrid drive system 10 can be driven in the first-stage engine direct drive mode.

[0058] Figure 6 This is a schematic diagram of power transmission in the direct-drive mode of the hybrid drive system of the first embodiment of the present invention, in the second-stage engine mode. Figure 6As shown in the figure, the power transmission direction is indicated by the arrow. In the second-stage engine direct drive mode, clutch 14 is engaged, fixing the first gear 133 onto the first motor output shaft 132. Synchronizer 16 is in the right position, brake 15 or one-way clutch brakes the gear ring 123, and engine 11 is driven. The first motor 13 and the second motor 18 are not engaged. In this embodiment, power transmission follows a single path: engine 11 drives planetary carrier 124, transmitting power to sun gear 122, and then via first gear 133 to intermediate shaft 17, then through fourth gear 173, differential gear 192, differential 19, and finally to the wheel ends. It is worth noting that when the vehicle is traveling at medium to high speeds, the hybrid drive system 10 can operate in the second-stage engine direct drive mode.

[0059] Figure 7 This is a schematic diagram of the power transmission of the hybrid drive system in Level 1 hybrid mode according to the first embodiment of the present invention. Figure 7 As shown in the figure, the power transmission direction is as indicated by the arrow in the figure. In the first-level hybrid mode, the clutch 14 is not working, the synchronizer 16 is in the left position, the gear ring 123 is engaged with the engagement element, the engine 11 drives the planetary carrier 124 to rotate, the first motor 13 drives the sun gear 122 to rotate, the engine 11 and the first motor 13 are continuously coupled through the planetary gear device 12, and the second motor 18 is driven. In this embodiment, the power transmission has two paths. In path one, the power of the engine 11 is transmitted through the planetary carrier 124, and the power of the first motor 13 is transmitted through the sun gear 122. The power of the engine 11 and the first motor 13 is continuously coupled through the planetary gear set 12, output through the ring gear 123, and then transmitted to the first gear 133, the intermediate shaft 17, the fourth gear 173, the differential gear 192, the differential 19, and finally to the wheel end. In path two, the power is transmitted from the second motor 18 through the third gear 183 to the second gear 172, the intermediate shaft 17, the fourth gear 173, the differential gear 192, the differential 19, and finally to the wheel end. It is worth mentioning that when the hybrid drive system 10 operates in Level 1 hybrid mode, the system is in ECVT (Electronic Controlled Variable Transmission) continuously variable transmission mode. The operating point of the engine 11 can be adjusted by the first motor 13 and the second motor 18, decoupling it from the wheel-end output torque. This ensures that the engine 11 always operates in the high-efficiency range, guaranteeing the system's power and economy, and enabling the system to be developed for use in mid-to-high-end vehicles. When the vehicle is traveling at full speed, the hybrid drive system 10 can operate in Level 1 engine direct drive mode.

[0060] Figure 8 This is a schematic diagram of the power transmission of the hybrid drive system in the second-level hybrid mode according to the first embodiment of the present invention. Figure 8As shown in the figure, the power transmission direction is indicated by the arrow. In the secondary hybrid mode, the clutch 14 operates, fixing the first gear 133 onto the output shaft 132 of the first motor. The synchronizer 16 is in the left position, and the gear ring 123 engages with the engagement element. The engine 11, the first motor 13, and the second motor 18 are all driven. In this embodiment, the power transmission has two paths. In path one, the power of the engine 11 is transmitted through the planetary carrier 124, and the power of the first motor 13 is transmitted through the sun gear 122. At this time, the sun gear 122, the planetary carrier 124, and the gear ring 123 of the planetary gear set 12 rotate at the same speed, and the speed ratio of the entire planetary gear device 12 is 1. The power is transmitted from the first gear 133, the intermediate shaft 17, then through the fourth gear 173, the differential gear 192, the differential 19, and finally to the wheel end. In path two, the power is transmitted from the second motor 18 through the third gear 183 to the second gear 172, the intermediate shaft 17, the fourth gear 173, the differential gear 192, the differential 19, and finally to the wheel end. It is worth mentioning that when the car is traveling at low to medium speeds, the hybrid drive system 10 can be driven in the secondary engine direct drive mode.

[0061] Figure 9 This is a schematic diagram of the power transmission of the hybrid drive system of the first embodiment of the present invention in a three-level hybrid mode. Figure 9 As shown in the figure, the power transmission direction is indicated by the arrow. In the three-stage hybrid mode, clutch 14 operates, fixing the first gear 133 onto the output shaft 132 of the first motor. Synchronizer 16 is in the right position, and brake 15 or one-way clutch brakes the gear ring 123. Engine 11, first motor 13, and second motor 18 are driven. In this embodiment, power transmission has two paths. In path one, engine 11 drives planetary carrier 124 to transmit power to sun gear 122. First motor 13 also transmits power to sun gear 122. After coupling, power is transmitted from first gear 133, intermediate shaft 17, then through fourth gear 173, differential gear 192, differential 19, and finally to the wheel end. In path two, power is transmitted from second motor 18 through third gear 183 to second gear 172, intermediate shaft 17, fourth gear 173, differential gear 192, differential 19, and finally to the wheel end. It is worth mentioning that when the car is traveling at medium to high speeds, the hybrid drive system 10 can operate in three hybrid modes.

[0062] Figure 10 This is a schematic diagram of the power transmission of the hybrid drive system in the parking power generation mode according to the first embodiment of the present invention. Figure 10As shown in the figure, the power transmission direction is indicated by the arrow. In the parking generator mode, the clutches 14 are not engaged, the synchronizer 16 is in the intermediate position, the engine 11 and the first motor 13 are not engaged, and the second motor 18 generates electricity. In this embodiment, the power transmission has a single path. Power is transmitted from the wheel end through the differential 19, differential gear 192, fourth gear 173, second gear 172, and third gear 183 to the second motor 18, driving the second motor 18 to rotate and generate electrical energy.

[0063] The hybrid drive system 10 of this invention has a first-level pure electric mode, a second-level pure electric mode, a range-extending mode, a first-level engine direct drive mode, a second-level engine direct drive mode, a first-level hybrid mode, a second-level hybrid mode, a third-level hybrid mode, and a parking power generation mode. It can automatically switch between different modes based on the SOC (state of charge) value of the power battery and the vehicle speed requirement. For example, it determines the relationship between the power battery SOC value and a first threshold, or simultaneously determines the relationship between the power battery SOC value and the first threshold, and the relationship between the vehicle speed and a second threshold; based on the determination result, it switches the operating mode of the hybrid drive system 10. It should be noted that the first threshold is used to determine the level of the power battery SOC value, and the second threshold is used to determine the level of the vehicle speed. This embodiment does not limit the range of the first and second threshold values; they can usually be freely set according to the specific control strategy. Under different control strategies, the values ​​of the first and second thresholds will be different. After setting the first and second thresholds, the system automatically determines and switches between various modes based on the determination result.

[0064] The nine models mentioned above are illustrated in the table below:

[0065]

[0066]

[0067] Second Embodiment

[0068] Figure 11 This is a schematic diagram of the hybrid power drive system according to the second embodiment of the present invention. Figure 11 As shown, the hybrid drive system 10 of this embodiment has a structure that is generally the same as that of the hybrid drive system 10 of the first embodiment. The difference lies in the connection relationship between the engine 11 and the planetary gear device 12, as well as the connection relationship between the coupling device and the planetary gear device 12.

[0069] Specifically, in this embodiment, the first rotating element is a sun gear, the second rotating element is a ring gear, the third rotating element is a planet carrier, the engagement device is a synchronizer, and the switching device is a brake or a one-way clutch. That is, the ring gear 123 is connected to the engine output shaft 112, and the synchronizer 16 is fixed to the planet carrier 124. The synchronizer 16 includes a left position, a middle position, and a right position. When the synchronizer 16 is in the left position, the planet carrier 124 engages with the engagement element; when the synchronizer 16 is in the right position, the brake 15 or the one-way clutch brakes the planet carrier 124; when the synchronizer 16 is in the middle position, the planet carrier 124 disengages from the engagement element, and the brake 15 or the one-way clutch unlocks the planet carrier 124. For the connection relationships and driving methods of the components of the hybrid power drive system 10, please refer to the first embodiment.

[0070] The hybrid drive system 10 of this embodiment has a first-level pure electric mode, a second-level pure electric mode, a range-extending mode, a first-level engine direct drive mode, a second-level engine direct drive mode, a first-level hybrid mode, a second-level hybrid mode, a third-level hybrid mode, and a parking power generation mode. For the working state of the hybrid drive system 10 in each mode, please refer to the first embodiment, which will not be repeated here.

[0071] Third Embodiment

[0072] The hybrid drive system 10 of this embodiment has a similar structure to the hybrid drive system 10 of the first embodiment, except that the connection relationship between the engine 11 and the planetary gear device 12 and the connection relationship between the coupling device and the planetary gear device 12 are different.

[0073] Specifically, the first rotating element is a planetary carrier, the second rotating element is one of a sun gear and a ring gear, the third rotating element is the other of a sun gear and a ring gear, the engagement device is a synchronizer, and the switching device is a brake or a one-way clutch. For the connection relationships and driving methods of the 10 components of the hybrid drive system, please refer to the first embodiment.

[0074] Fourth embodiment

[0075] The hybrid drive system 10 of this embodiment has a similar structure to the hybrid drive system 10 of the first embodiment, except that the connection relationship between the engine 11 and the planetary gear device 12 and the connection relationship between the coupling device and the planetary gear device 12 are different.

[0076] Specifically, the first rotating element is a ring gear, the second rotating element is one of the sun gear and the planet carrier, the third rotating element is the other of the sun gear and the planet carrier, the engagement device is a synchronizer, and the switching device is a brake or a one-way clutch. For the connection relationships and driving methods of the various components of the hybrid drive system 10, please refer to the first embodiment.

[0077] In the hybrid drive system 10 of the present invention, both the engine 11 and the first motor 13 are connected to a planetary gear assembly 12. A clutch gear assembly is disposed between the first motor 13 and the planetary gear assembly 12. The planetary gear assembly 12 includes a first rotating element, a second rotating element, and a third rotating element. The first rotating element is connected to the first motor 13, the second rotating element is connected to the engine 11, and the third rotating element is connected to an engagement device. The clutch gear assembly includes a clutch 14, a clutch gear connected to the clutch 14, and an engagement element. The clutch gear is connected to an output end. The engagement device engages the third rotating element and the engagement element, or engages the third rotating element and a switching device, or engages only the third rotating element. The switching device locks or unlocks the third rotating element. The second motor 18 is arranged parallel to the first motor 13 and is connected to the output end. The hybrid drive system 10 of the present invention can operate in first-level pure electric mode, second-level pure electric mode, range-extending mode, first-level engine direct drive mode, second-level engine direct drive mode, first-level hybrid mode, second-level hybrid mode, third-level hybrid mode, and parking generator mode, exhibiting strong flexibility. Furthermore, the engine 11 and the first motor 13 are connected via planetary gears 125 of the planetary gear assembly 12, allowing for adjustable speed ratios over a wide range, which effectively reduces the size of the first motor 13. In addition, when switching modes, the second motor 18 participates in the drive of the hybrid drive system 10 of this invention, eliminating any power interruption. Moreover, the hybrid drive system 10 of this invention can cover both HEV and PHEV models, demonstrating good platform compatibility.

[0078] This invention is not limited to the specific details of the above embodiments. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of this invention, and all such modifications fall within the protection scope of this invention. The specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this invention will not further describe the various possible combinations.

Claims

1. A hybrid power drive system, characterized in that, include: The system includes an engine, a first motor, a second motor, a planetary gear assembly, a clutch gear assembly, an engagement device, and a switching device. The engine and the first motor are both connected to the planetary gear assembly, and the clutch gear assembly is located between the first motor and the planetary gear assembly. The planetary gear device includes a first rotating element, a second rotating element, and a third rotating element. The first rotating element is connected to the first motor, the second rotating element is connected to the engine, and the third rotating element is connected to the engagement device. The clutch gear assembly includes a clutch, a clutch gear connected to the clutch, and an engagement element, wherein the clutch gear is connected to the output end; The engagement device engages the third rotating element with the engagement element, or engages the third rotating element with the switching device, or engages only the third rotating element; The switching device locks or unlocks the third rotating element; The second motor is arranged parallel to the first motor, and the second motor is connected to the output terminal; The engagement device includes a first working position, a second working position, and a third working position. In the first working position, the engagement device engages and fixes the third rotating element and the engagement element. In the second working position, the engagement device engages only the third rotating element. In the third working position, the engagement device engages and fixes the third rotating element and the switching device. The engagement device is a synchronizer.

2. The hybrid drive system as described in claim 1, characterized in that, The first motor includes a first motor output shaft, the clutch gear assembly is disposed on the first motor output shaft, the clutch is connected to the first motor output shaft, the clutch gear is loosely fitted on the first motor output shaft, and the engagement element is fixed to the clutch and parallel to the clutch gear.

3. The hybrid drive system as described in claim 1, characterized in that, The first motor, clutch gear assembly, planetary gear assembly, and engine are coaxially arranged.

4. The hybrid drive system as described in claim 1, characterized in that, The first rotating element is a sun gear, the second rotating element is a planet carrier, the third rotating element is a ring gear, the switching device is a brake or a one-way clutch, and the clutch gear is the first gear. The engine has an engine output shaft, the first motor has a first motor output shaft, the planetary carrier is connected to the engine output shaft, the sun gear is connected to the first motor output shaft, and the first gear is loosely fitted on the first motor output shaft; When the clutch is in operation, it fixes the first gear onto the output shaft of the first motor. The brake or one-way clutch brakes or unlocks the gear ring; The synchronizer includes a left station, a middle station, and a right station. When the synchronizer is in the left station, the gear ring engages with the engagement element. When the synchronizer is in the right station, the brake or one-way clutch brakes the gear ring. When the synchronizer is in the middle station, the gear ring separates from the engagement element, and the brake or one-way clutch unlocks the gear ring. The hybrid drive system also includes an intermediate shaft, on which a second gear is provided, and the second gear meshes with the first gear. The second motor has a second motor output shaft, and a third gear is provided on the second motor output shaft, the third gear meshing with the second gear.

5. The hybrid drive system as described in claim 4, characterized in that, The hybrid drive system also includes a differential, on which a differential gear is provided, and a fourth gear is provided on the intermediate shaft, the fourth gear meshing with the differential gear.

6. The hybrid drive system as described in claim 4, characterized in that, The hybrid drive system has a first-level pure electric mode, a second-level pure electric mode, a range-extending mode, a first-level engine direct drive mode, a second-level engine direct drive mode, a first-level hybrid mode, a second-level hybrid mode, a third-level hybrid mode, and a parking power generation mode.

7. The hybrid drive system as described in claim 6, characterized in that, In the first-level pure electric mode, the clutch is not working, the synchronizer is in the intermediate position, the engine and the first motor are not working, and the second motor is driving. In the secondary pure electric mode, the clutch is engaged, which fixes the first gear on the output shaft of the first motor. The synchronizer is in the intermediate position, the engine is not working, and both the first motor and the second motor are driven.

8. The hybrid drive system as described in claim 6, characterized in that, In the range-extending mode, the synchronizer is in the right position, the brake or one-way clutch brakes the gear ring, the engine drives the first motor to generate electricity, the first motor provides power to the second motor, and the second motor drives the engine.

9. The hybrid drive system as described in claim 6, characterized in that, In the direct drive mode of the first-stage engine, the clutch is engaged, the clutch fixes the first gear on the output shaft of the first motor, the synchronizer is in the left position, the gear ring engages with the engagement element, the engine is driven, and neither the first motor nor the second motor is working. In the direct drive mode of the secondary engine, the clutch is engaged, which fixes the first gear on the output shaft of the first motor. The synchronizer is in the right position, and the brake or one-way clutch brakes the gear ring. The engine is driven, and neither the first motor nor the second motor is engaged.

10. The hybrid drive system as claimed in claim 6, characterized in that, In the first-level hybrid mode, the clutch is not working, the synchronizer is in the left position, the gear ring is engaged with the engagement element, the engine drives the planetary carrier to rotate, the first motor drives the sun gear to rotate, the engine and the first motor are continuously coupled through the planetary gear device, and the second motor provides drive. In the secondary hybrid mode, the clutch operates, fixing the first gear onto the output shaft of the first motor, the synchronizer is in the left position, the gear ring engages with the engagement element, and the engine, the first motor, and the second motor are all driven. In the three-stage hybrid mode, the clutch operates, fixing the first gear onto the output shaft of the first motor. The synchronizer is in the right position, and the brake or one-way synchronizer brakes the gear ring, driving the engine, the first motor, and the second motor.

11. The hybrid drive system as claimed in claim 6, characterized in that, In the parking power generation mode, the clutch is not engaged, the synchronizer is in the intermediate position, the engine and the first motor are not engaged, and power is transmitted from the wheel end to the second motor for power generation.

12. The hybrid drive system as claimed in claim 1, characterized in that, The first rotating element is a sun gear, the second rotating element is a ring gear, the third rotating element is a planet carrier, and the switching device is a brake or a one-way clutch.

13. The hybrid drive system as claimed in claim 1, characterized in that, The first rotating element is a planet carrier, the second rotating element is one of a sun gear and a ring gear, the third rotating element is the other of a sun gear and a ring gear, and the switching device is a brake or a one-way clutch.

14. The hybrid drive system as claimed in claim 1, characterized in that, The first rotating element is a gear ring, the second rotating element is one of a sun gear and a planet carrier, the third rotating element is the other of a sun gear and a planet carrier, and the switching device is a brake or a one-way clutch.

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