WO2020038421A1

WO2020038421A1 - Hybrid power drive system

Info

Publication number: WO2020038421A1
Application number: PCT/CN2019/101863
Authority: WO
Inventors: 祁宏钟; 张安伟; 赵江灵; 吴为理; 王川; 尚阳; 林济余; 朱永明
Original assignee: 广州汽车集团股份有限公司
Priority date: 2018-08-22
Filing date: 2019-08-21
Publication date: 2020-02-27
Also published as: CN110857027A

Abstract

A hybrid power drive system (10), comprising an engine (11), a first motor (13), a second motor (17), a planetary gear device, a clutch gear device, a switching device. The engine (11) and the first motor (13) are both connected to the clutch gear device; the clutch gear device is disposed between the engine (11) and the first motor (13); the planetary gear device comprises a first rotating element, a second rotating element, and a third rotating element; the first rotating element is provided with a rotating wheel shaft (122); the first motor (13) is connected to the rotating wheel shaft (122); the clutch gear device comprises a first clutch (141) and a second clutch (142); the first clutch (141) is connected to the engine (11) and the rotating wheel shaft (122); the second clutch (142) is connected to the first rotating element and the third rotating element; the second motor (17) is disposed in parallel to the first motor (13); the second motor (17) is connected to an output end. The hybrid power drive system (10) has multiple operating modes and implements good platformization.

Description

Hybrid drive system

Technical field

The invention relates to the field of new energy technologies, and in particular, to a hybrid drive system.

Background technique

Currently, there are two types of transmissions on the market: stepped transmissions and continuously variable transmissions. The stepped transmission is subdivided into manual and automatic. Most of them provide a limited number of discrete input and 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 Rely on the speed change of the internal combustion engine to achieve. Continuously variable transmission, whether mechanical, hydraulic or electromechanical, can provide an unlimited number of continuously selectable speed ratios within a certain speed range. In theory, the speed change of the driving wheels can be completely accomplished by the transmission. Can work as best as possible in the best speed range. Compared with the stepless transmission, the continuously variable transmission has many advantages such as smooth speed regulation and full use of the maximum power of the internal combustion engine. Therefore, the continuously variable transmission has been the object of research by engineers from various countries for many years.

In recent years, the birth of electric motor hybrid technology has opened up a new way to achieve the perfect matching of power between internal combustion engines and power wheels. Among the many powertrain design schemes, there are two types of series hybrid systems and parallel hybrid systems.

In the series hybrid system, the internal combustion engine, generator, motor, shaft system, and drive wheels form a series power chain. The powertrain structure is extremely simple. Among them, the combination of generator and motor can be regarded as a transmission in the traditional sense. When used in combination with energy storage devices such as batteries and capacitors, the transmission can also be used as an energy adjustment device to complete independent adjustments of speed and torque.

A parallel hybrid system has two parallel independent power chains. One consists of a traditional mechanical transmission, and the other consists of a motor and a battery system. The mechanical transmission is responsible for adjusting the speed, and the motor and battery system are adjusting the power or torque. In order to give full play to the potential of the entire system, the mechanical transmission also requires a continuously variable transmission.

technical problem

The advantages of a series hybrid system are simple structure and flexible layout, but all power passes through the generator and motor, so the motor requires high power, large volume and heavy weight. At the same time, the efficiency of the entire system is low due to the two mechanical and electrical conversions in the energy transmission process. In a parallel hybrid system, only part of the power passes through the motor system, so the power requirements of the motor are relatively low, and the overall system efficiency is high. However, parallel hybrid systems require two independent subsystems, which are expensive and are usually only used for weak hybrid systems.

Technical solutions

In view of this, the present invention provides a hybrid drive system, which has a simple structure, multiple working modes, and good platformization.

An embodiment of the present invention provides a hybrid drive system including an engine, a first motor, a second motor, a planetary gear device, a clutch gear device, and a switching device. The engine and the first motor are both connected to the planetary gear device. The clutch gear The device is disposed between the engine and the first motor; the planetary gear device includes a first rotating element, a second rotating element, and a third rotating element, the first rotating element has a rotating wheel shaft, and the first motor is connected to the rotating wheel shaft; the clutch gear device includes The first clutch and the second clutch, the first clutch connects the engine and the rotating wheel shaft, the second clutch connects the first rotation element and the third rotation element; the second motor is arranged in parallel with the first motor, and the second motor is connected to the output end.

In an embodiment of the present invention, the second clutch includes a driving part and a driven part, the driving part is connected to the rotating wheel shaft, and the driven part is connected to the third rotating element; or, the The driven portion is connected to the rotating wheel shaft, and the driving portion is connected to the third rotating element.

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, and the switching device is a brake or a one-way clutch;

The first motor has a first motor output shaft, a first gear is provided on the first motor output shaft, a second gear is provided on the rotating wheel shaft, and the first gear and the second gear mesh with each other ;

Engaging the engine and the rotating wheel shaft when the first clutch is in operation; locking the sun gear and the ring gear when the second clutch is in operation;

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

The hybrid drive system further includes an intermediate shaft, and a third gear is provided on the intermediate shaft, and the third gear and the planet carrier mesh with each other;

The second motor has a second motor output shaft, a fourth gear is provided on the second motor output shaft, and the fourth gear and the third gear mesh with each other.

In an embodiment of the present invention, the hybrid drive system further includes a differential, a differential gear is provided on the differential, a fifth gear is provided on the intermediate shaft, and the fifth gear Intermesh with the differential gear.

In the embodiment of the present invention, the hybrid drive system has a single-motor pure electric mode, a dual-motor pure electric first-speed mode, a dual-motor pure electric second-speed mode, an extended range mode, an engine alone driving one-speed mode, and an engine alone Drives two-speed mode, one-level hybrid mode, two-level hybrid mode, and parking power generation mode.

In the embodiment of the present invention, in the single-motor pure electric mode, the first clutch, the second clutch, the brake or one-way clutch, the engine, and the first motor are all inoperative. The second motor drives; in the dual-motor pure electric first-speed mode, the engine, the first clutch, and the second clutch do not work, and the brake or one-way clutch works, the A brake or a one-way clutch brakes the ring gear, and the first motor and the second motor are driven; in the two-motor pure electric two-speed mode, the engine and the first clutch do not work The brake or one-way clutch does not work, the second clutch works, the second clutch locks the sun gear and the ring gear, and both the first motor and the second motor are driven.

In an embodiment of the present invention, in the extended range mode, the first clutch is activated, the first clutch engages the engine and the rotating wheel shaft, the second clutch is not activated, the brake or The one-way clutch does not work, the engine drives the first motor to generate electricity, the first motor provides power to the second motor, and the second motor drives.

In an embodiment of the present invention, in the single-drive mode of the engine, the first clutch works, the brake or one-way clutch works, and the first clutch engages the engine and the rotating wheel shaft, The brake or one-way clutch brakes the ring gear, the second clutch, the first motor, and the second motor are not operated, and the engine is driven; the engine is driven in the second gear mode alone Next, the first clutch and the second clutch operate, the first clutch engages the engine and the rotating wheel shaft, the second clutch locks the sun gear and the ring gear, and the first clutch The motor, the second motor, and the brake or one-way clutch are not operated, and the engine is driven.

In an embodiment of the present invention, in the one-stage hybrid mode, the first clutch works, the brake or one-way clutch works, and the first clutch engages the engine and the rotating wheel shaft, so The brake or one-way clutch brakes the ring gear, the second clutch does not work, and the engine, the first motor, and the second motor are driven; in the two-stage hybrid mode, all The first clutch and the second clutch operate, the first clutch engages the engine and the rotating wheel shaft, the second clutch locks the sun gear and the ring gear, the brake or one-way clutch Not working, the engine, the first motor and the second motor are all driven.

In an embodiment of the present invention, in the parking power generation mode, the first clutch works, the first clutch engages the engine and the rotating wheel shaft, the second clutch and the brake or a single When the clutch is not operated, the power of the engine is transmitted to the first motor to generate electricity.

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

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

Beneficial effect

The hybrid drive system provided by the embodiment of the present invention can be used in a single-motor pure electric mode, a dual-motor pure electric first-speed mode, a dual-motor pure electric second-speed mode, an extended range mode, an engine alone driving one-speed mode, and an engine alone driving the second-speed mode. It works under the mode, first-level hybrid mode, second-level hybrid mode, and parking power generation mode, which has strong flexibility. The hybrid drive system of the present invention can cover HEV models and PHEV models with good platformization.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a hybrid drive system according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of power transmission of a hybrid drive system according to a first embodiment of the present invention in a single motor pure electric mode.

FIG. 3 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a two-motor pure electric one-speed mode.

FIG. 4 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a two-motor pure electric second-speed mode.

FIG. 5 is a schematic diagram of power transmission of the hybrid drive system in the extended range mode according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a mode where the engine is driven alone in the first gear mode.

FIG. 7 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a mode where the engine is independently driven in the second gear mode.

FIG. 8 is a schematic diagram of power transmission of the hybrid drive system in the first-stage hybrid mode according to the first embodiment of the present invention.

FIG. 9 is a schematic diagram of power transmission of the hybrid drive system in the two-stage hybrid mode according to the first embodiment of the present invention.

FIG. 10 is a schematic diagram of power transmission of the hybrid drive system in the parking power generation mode according to the first embodiment of the present invention.

11 is a schematic structural diagram of a hybrid drive system according to a second embodiment of the present invention.

FIG. 12 is a schematic structural diagram of a hybrid drive system according to a third embodiment of the present invention.

Embodiments of the invention

First embodiment

FIG. 1 is a schematic structural diagram of a hybrid drive system according to a first embodiment of the present invention. As shown in FIG. 1, the hybrid drive system 10 includes an engine 11, a planetary gear device, a first electric machine 13, a clutch gear device, a switching device, an intermediate shaft 16, a second electric machine 17, a differential 18, and a power battery (not shown in the figure).示).

The engine 11 is, for example, a gasoline engine or a diesel engine.

The planetary gear device includes a first rotation element, a second rotation element, and a third rotation element. The first rotating element has a rotating wheel shaft 122. The rotating wheel shaft 122 and the first rotating element can rotate synchronously. The rotating wheel shaft 122 is connected to the first motor 13. In this embodiment, the first rotating element is, for example, the sun gear 121, the second rotating element is, for example, the planet carrier 124, and the third rotating element is, for example, the ring gear 126. The planet carrier 124 is provided with a planet gear 125. The planet gear 125 is connected to the planet carrier 124 through rolling or sliding bearings. The sun gear 121 is disposed in the ring gear 126. The sun gear 121 and the planet gear 125 and the ring gear 126 mesh with each other.

The first motor 13 has a first motor output shaft 131. The first motor output shaft 131 is provided with a first gear 132. The rotating wheel shaft 122 is provided with a second gear 123. The first gear 132 and the second gear 123 mesh with each other. In this embodiment, the first motor 13 is an integrated drive and power generation machine.

The clutch gear device includes a first clutch 141 and a second clutch 142. The second clutch 142 includes a driving portion 142a and a driven portion 142b. The driving portion 142a is connected to the rotating wheel shaft 122, and the driven portion 142b is connected to a third rotating element (ring gear 126). In this embodiment, the first clutch 141 engages the engine 11 and the rotating axle 122. For example, when the first clutch 141 is activated, the first clutch 141 engages the engine 11 and the rotating axle 122; when the first clutch 141 is not activated, the first clutch 141 The clutch 141 separates the engine 11 from the rotating wheel shaft 122. The second clutch 142 locks the first rotating element (the sun gear 121) and the third rotating element (the ring gear 126). For example, when the second clutch 142 is operated, the second clutch 142 locks the sun gear 121 and the ring gear 126, that is, the second The driving part 142a of the clutch 142 is combined with the driven part 142b; when the second clutch 142 is not in operation, the second clutch 142 separates the sun gear 121 from the ring gear 126, that is, the driving part 142a and the driven part 142b of the second clutch 142 disconnect.

The switching device is used to lock or unlock the ring gear 126 (third rotation element). In this embodiment, the switching device is, for example, a brake 151 or a one-way clutch, and the brake 151 or the one-way clutch is used to brake or unlock the ring gear 126. In this embodiment, when the brake 151 or the one-way clutch works, the brake 151 or the one-way clutch brakes the ring gear 126; when the brake 151 or the one-way clutch does not work, the brake 151 or the one-way clutch unlocks the ring gear 126.

The intermediate shaft 16 is provided with a third gear 161 and a fifth gear 162. The third gear 161 and the fifth gear 162 are spaced from each other. The third gear 161 and the planet carrier 124 mesh with each other.

The second motor 17 is disposed in parallel with the first motor 13, and the second motor 17 is connected to the output terminal. Specifically, the second motor 17 has a second motor output shaft 171, and a fourth gear 172 is provided on the second motor output shaft 171. The fourth gear 172 and the third gear 161 mesh with each other. In this embodiment, the second motor 17 is an integrated drive and power generation machine.

The differential 18 is provided with a differential gear 181, and the differential gear 181 and the fifth gear 162 mesh with each other. In this embodiment, the differential 18 is used to adjust the speed difference between the left and right wheels. When the car is turning or driving on uneven roads, the left and right wheels roll at different speeds to ensure pure rolling motion of the driving wheels on both sides.

The power battery is electrically connected to the first motor 13 and the second motor 17 respectively. The power battery provides power for driving the first motor 13 and the second motor 17, and at the same time, the power generated by the rotation of the first motor 13 and the second motor 17 can be stored in the power battery. In this embodiment, the engine 11 drives the first motor 13 through the planetary carrier 124 and the sun wheel 121 to generate electric energy, and the electric energy can be stored in the power battery. When the car is braked, the power passes from the wheel end through the differential 18, The differential gear 181, the fifth gear 162, the third gear 161, and the fourth gear 172 are then transmitted to the second motor 17, which drives the second motor 17 to rotate to generate electric energy, which can be stored in the power battery; when parked The power of the engine 11 is transmitted to the first motor 13 through the sun gear 121, and the first motor 13 is rotated to generate electric energy.

The hybrid drive system 10 of the present invention has a single-motor pure electric mode, a dual-motor pure electric one-speed mode, a dual-motor pure electric two-speed mode, an extended range mode, an engine alone driving one-speed mode, an engine independent driving two-speed mode, Level hybrid mode, level two hybrid mode and parking power generation mode.

FIG. 2 is a schematic diagram of power transmission of a hybrid drive system according to a first embodiment of the present invention in a single motor pure electric mode. As shown in FIG. 2, the power transmission direction is shown by the arrow direction in the figure. In the single-motor pure electric mode, the first clutch 141 and the second clutch 142 do not work, the brake 151 or the one-way clutch does not work, the engine 11 and the first None of the one motor 13 operates, and the second motor 17 is driven. In this embodiment, the power transmission has a path, that is, the second motor 17 is transmitted to the third gear 161, the intermediate shaft 16, the fifth gear 162, the differential gear 181, and the differential 18 through the fourth gear 172, Finally to the end of the wheel. It is worth mentioning that when the car is running at full speed, the hybrid drive system 10 can be driven in a single-motor pure electric mode.

FIG. 3 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a two-motor pure electric one-speed mode. As shown in FIG. 3, the power transmission direction is shown by the arrow direction in the figure. In the dual-motor pure electric one-speed mode, the engine 11, the first clutch 141, and the second clutch 142 are not operated, and the brake 151 or the one-way clutch is operated. The brake 151 or the one-way clutch brakes the ring gear 126, and both the first motor 13 and the second motor 17 are driven. In this embodiment, the power transmission has two paths, of which path one, the first motor 13 is transmitted to the intermediate shaft 16 through the rotating wheel shaft 122, the planet wheel 125, and the planet carrier 124, and then passes through the third gear 161 and the fifth gear 162 , Differential gear 181, differential 18, and finally to the wheel end; path two, the second motor 17 is transmitted to the third gear 161, the intermediate shaft 16, the fifth gear 162, and the differential gear 181 through the fourth gear 172 , Differential 18, and finally to the wheel end. It is worth mentioning that when the car is driving at a low or medium speed, the hybrid drive system 10 can be driven in a two-motor pure electric one-speed mode.

FIG. 4 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a two-motor pure electric second-speed mode. As shown in FIG. 4, the power transmission direction is shown by the arrow direction in the figure. In the dual-motor pure electric second-speed mode, the engine 11 and the first clutch 141 do not work, the brake 151 or the one-way clutch does not work, and the second clutch 142 Work, the second clutch 142 locks the sun gear 121 and the ring gear 126 (the sun gear 121 and the ring gear 126 are locked as a whole, the entire planetary gear device rotates as a whole, and the speed ratio is 1), the first motor 13 and the second motor 17 are driven. In this embodiment, the power transmission has two paths, of which path one, the first motor 13 is transmitted to the intermediate shaft 16 through the entire planetary gear device, and then passes through the third gear 161, the fifth gear 162, the differential gear 181, Differential 18, finally to the wheel end; path two, the second motor 17 is transmitted to the third gear 161, the intermediate shaft 16, the fifth gear 162, the differential gear 181, the differential 18 through the fourth gear 172, and finally To the end of the wheel. It is worth mentioning that when the car is driving at a medium to high speed, the hybrid drive system 10 can be driven in a two-motor pure electric second gear mode.

FIG. 5 is a schematic diagram of power transmission of the hybrid drive system in the extended range mode according to the first embodiment of the present invention. As shown in FIG. 5, the power transmission direction is shown by the arrow direction in the figure. In the extended range mode, the first clutch 141 works, the first clutch 141 engages the engine 11 and the rotating wheel shaft 122, the second clutch 142 does not work, and the brake 151 Or the one-way clutch does not work, the engine 11 drives the first motor 13 to generate electricity, the first motor 13 provides power to the second motor 17, and the second motor 17 drives. The engine 11 drives the first motor 13 through the rotating wheel shaft 122, the second gear 123, and the first gear 132 to rotate the first motor 13 to generate electricity. The electric energy generated by the first motor 13 is stored in the power battery, and the second motor is provided by the power battery. 17 driving power. In this embodiment, the power transmission has a path, which is transmitted by the second motor 17 through the fourth gear 172 to the third gear 161, the intermediate shaft 16, the fifth gear 162, the differential gear 181, the differential 18, and finally To the end of the wheel. It is worth mentioning that when the car is running at full vehicle speed, the hybrid drive system 10 can be driven in the extended range mode.

FIG. 6 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a mode where the engine is driven alone in the first gear mode. As shown in FIG. 6, the power transmission direction is shown by the arrow direction in the figure. In the single-drive mode of the engine, the first clutch 141 works, and the brake 151 or one-way clutch works. The first clutch 141 engages the engine 11 and the rotating axle. 122, the brake 151 or the one-way clutch brake ring gear 126, the second clutch 142, the first motor 13 and the second motor 17 are not operated, and the engine 11 is driven. In this embodiment, the power transmission has a path, which is transmitted from the engine 11 to the intermediate shaft 16 through the first clutch 141, the rotating wheel shaft 122, the planet wheel 125, the planet carrier 124, and the third gear 161, and then through the fifth gear 162, The differential gear 181, the differential 18, and finally to the wheel end. It is worth mentioning that when the car is driving at a low speed, the hybrid drive system 10 can be driven in a mode where the engine is driven alone.

FIG. 7 is a schematic diagram of power transmission of the hybrid drive system according to the first embodiment of the present invention in a mode where the engine is independently driven in the second gear mode. As shown in FIG. 7, the power transmission direction is shown by the arrow direction in the figure. In the second-speed mode of the engine alone driving, the first clutch 141 and the second clutch 142 are operated. The first clutch 141 engages the engine 11 and the rotating wheel shaft 122. The second clutch 142 locks the sun gear 121 and the ring gear 126 (the sun gear 121 and the ring gear 126 are locked into one body, and the entire planetary gear device rotates as a whole, and the speed ratio is 1), and the first motor 13 and the second motor 17 do not work. Neither the brake 151 nor the one-way clutch is operated, and the engine 11 is driven. In this embodiment, the power transmission has a path, the engine 11 is transmitted to the intermediate shaft 16 through the entire planetary gear device, and then passes through the fifth gear 162, the differential gear 181, the differential 18, and finally to the wheel end. It is worth mentioning that when the car is running at a medium to high speed, the hybrid drive system 10 can be driven in the engine's separate drive second gear mode.

FIG. 8 is a schematic diagram of power transmission of the hybrid drive system in the first-stage hybrid mode according to the first embodiment of the present invention. As shown in FIG. 8, the power transmission direction is shown by the arrow direction in the figure. In the one-stage hybrid mode, the first clutch 141 is operated, and the brake 151 or one-way clutch is operated. The first clutch 141 engages the engine 11 and the rotating wheel shaft 122. The brake 151 or the one-way clutch brakes the ring gear 126, the second clutch 142 is not operated, and the engine 11, the first motor 13, and the second motor 17 are driven. In this embodiment, the power transmission has three paths, of which path one, the engine 11 is transmitted to the intermediate shaft 16 through the rotating wheel shaft 122, the planet wheel 125, the planet carrier 124, and the third gear 161, and then passes through the fifth gear 162 and the differential speed. Gear 181, differential 18, and finally to the wheel end; path two, the first motor 13 is transmitted to the intermediate shaft 16 through the rotating wheel shaft 122, the planet gear 125, and the planet carrier 124, and then through the third gear 161 and the fifth gear 162 , Differential gear 181, differential 18, and finally to the wheel end; path three, the second motor 17 is transmitted to the third gear 161, the intermediate shaft 16, the fifth gear 162, and the differential gear 181 through the fourth gear 172 , Differential 18, and finally to the wheel end. It is worth mentioning that when the car is driving at a low or medium speed, the hybrid drive system 10 can be driven in a mode where the engine is driven alone.

FIG. 9 is a schematic diagram of power transmission of the hybrid drive system in the two-stage hybrid mode according to the first embodiment of the present invention. As shown in FIG. 9, the power transmission direction is shown by the arrow direction in the figure. In the two-stage hybrid mode, the first clutch 141 and the second clutch 142 work. The first clutch 141 engages the engine 11 and the rotating wheel shaft 122. The clutch 142 locks the sun gear 121 and the ring gear 126 (the sun gear 121 and the ring gear 126 are locked into one body, and the entire planetary gear device rotates as a whole, and the speed ratio is 1). The brake 151 or one-way clutch does not work. Both the first motor 13 and the second motor 17 are driven. In this embodiment, the power transmission has three paths. Among the paths, the engine 11 is transmitted to the intermediate shaft 16 through the entire planetary gear device, and then passes through the fifth gear 162, the differential gear 181, the differential 18, and finally to the wheel. Path two, the first motor 13 is transmitted to the intermediate shaft 16 through the entire planetary gear device, and then passes through the third gear 161, the fifth gear 162, the differential gear 181, the differential 18, and finally to the wheel end; path three The second motor 17 is transmitted to the third gear 161, the intermediate shaft 16, the fifth gear 162, the differential gear 181, and the differential 18 through the fourth gear 172, and finally to the wheel end. It is worth mentioning that when the car is driving at a medium or high speed, the hybrid drive system 10 can be driven in the engine's separate drive second gear mode.

FIG. 10 is a schematic diagram of power transmission of the hybrid drive system in the parking power generation mode according to the first embodiment of the present invention. As shown in FIG. 10, the power transmission direction is shown by the arrow direction in the figure. In the parking power generation mode, the first clutch 141 is activated, the first clutch 141 engages the engine 11 and the rotating axle 122, the second clutch 142 is not activated, and the brake 151 or the one-way clutch does not work, and the power of the engine 11 is transmitted to the first electric machine 13 to generate electricity.

The hybrid drive system 10 of the present invention has a single-motor pure electric mode, a dual-motor pure electric one-speed mode, a dual-motor pure electric two-speed mode, an extended range mode, an engine alone driving one-speed mode, an engine independent driving two-speed mode, The level hybrid mode, the level two hybrid mode, and the parking power generation mode can automatically switch between different modes according to the SOC (residual power) value of the power battery and the speed requirement. For example, determine the magnitude relationship between the SOC value of the power battery and the first threshold value, or determine the magnitude relationship between the SOC value of the power battery and the first threshold value, and the magnitude relationship between the vehicle speed and the second threshold value; switch the operation of the hybrid drive system 10 according to the determination result. mode. It should be noted that the first threshold is used to determine the level of the SOC of the power battery, and the second threshold is used to determine the level of the vehicle speed. This embodiment does not limit the range of the values of the first threshold and the second threshold. The control strategy can be set freely. Under different control strategies, the values of the first threshold and the second threshold are different. After the first threshold value and the second threshold value are set, an automatic judgment is made and the various modes are automatically switched according to the judgment result.

The above nine modes are embodied in the following table:

Second embodiment

11 is a schematic structural diagram of a hybrid drive system according to a second embodiment of the present invention. As shown in FIG. 11, the hybrid drive system 10 of this embodiment is roughly the same in structure as the hybrid drive system 10 of the first embodiment, except that the connection relationship between the engine 11 and the planetary gear device and the clutch gear device and the planetary gear device are different. The connection relationship is different.

Specifically, in this embodiment, the first rotating element is the ring gear 126, the second rotating element is one of the sun gear 121 and the planet carrier 124, the third rotating element is the sun gear 121 and the planet carrier 124, and the switching device It is a brake 151 or a one-way clutch. For the connection relationship and driving method of each component of the hybrid drive system 10, refer to the first embodiment. Third embodiment

FIG. 12 is a schematic structural diagram of a hybrid drive system according to a third embodiment of the present invention. As shown in FIG. 12, the hybrid drive system 10 of this embodiment is roughly the same in structure as the hybrid drive system 10 of the first embodiment, except for the connection relationship between the engine 11 and the planetary gear device, and the clutch gear device and the planetary gear device. The connection relationship is different.

Specifically, in this embodiment, the first rotating element is the planet carrier 124, the second rotating element is one of the sun gear 121 and the ring gear 126, the third rotating element is the sun gear 121 and the ring gear 126, and the switching device It is a brake 151 or a one-way clutch. For the connection relationship and driving method of each component of the hybrid drive system 10, please refer to the first embodiment.

The engine 11 and the first electric machine 13 of the hybrid drive system 10 of the hybrid drive system 10 of the present invention are both connected to a planetary gear device, and a clutch gear device is provided between the engine 11 and the first motor 13; the planetary gear device includes a first A rotating element, a second rotating element, and a third rotating element. The first rotating element has a rotating wheel shaft 122, and the first motor 13 is connected to the rotating wheel shaft 122. The clutch gear device includes a first clutch 141, a second clutch 142, and a first clutch 141. The engine 11 and the rotating wheel shaft 122 are connected, the second clutch 142 connects the first rotating element and the third rotating element; the second motor 17 is disposed in parallel with the first motor 13, and the second motor 17 is connected to the output end. The hybrid drive system 10 of the present invention can be used in a single-motor pure electric mode, a dual-motor pure electric first-speed mode, a dual-motor pure electric second-speed mode, an extended range mode, an engine alone driving one-speed mode, an engine alone driving two-speed mode, Working under the first-level hybrid mode, second-level hybrid mode, and parking power generation mode, it has strong flexibility. In addition, the engine 11 and the first electric machine 13 are connected by a planetary gear device, the speed ratio is adjustable, and the range of the speed ratio is large, which can effectively reduce the volume of the first electric machine 13. In addition, in the hybrid drive system 10 of the present invention, when the mode is switched, the second motor 17 participates in driving, and there is no problem of interruption of power. In addition, the hybrid drive system 10 of the present invention can cover HEV models and PHEV models, and has a good platform.

It is worth mentioning that the engine 11 of the hybrid drive system 10 of the present invention is connected to the sun gear 121, and the ratio of the gear ratios (step ratios) of the two gears of the system is relatively large. The power performance is better.

The present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention. The specific technical features described in the foregoing specific implementation manners can be combined in any suitable manner without conflict. In order to avoid unnecessary repetition, various possible combinations are not described separately in the present invention.

Industrial applicability

Claims

A hybrid drive system, comprising:

An engine, a first motor, a second motor, a planetary gear device, a clutch gear device, and a switch device; the engine and the first motor are all connected to the planetary gear device; and the clutch gear device is provided between the engine and Between the first motors;

The planetary gear device includes a first rotation element, a second rotation element, and a third rotation element, the first rotation element has a rotation wheel shaft, and the first motor is connected to the rotation wheel shaft;

The clutch gear device includes a first clutch and a second clutch, the first clutch connects the engine and the rotating wheel shaft, and the second clutch connects the first rotating element and the third rotating element;

The switch device locks or unlocks the third rotation element;

The second motor is disposed in parallel with the first motor, and the second motor is connected to an output terminal.
The hybrid drive system according to claim 1, wherein the second clutch includes a driving portion and a driven portion, the driving portion is connected to the rotating wheel shaft, and the driven portion is connected to the first Three rotating elements; or the driven part is connected to the rotating wheel shaft, and the driving part is connected to the third rotating element.
The hybrid drive system according to claim 1, wherein the first rotating element is a sun gear, the second rotating element is a planet carrier, the third rotating element is a ring gear, and the switching device Is a brake or one-way clutch;

The first motor has a first motor output shaft, a first gear is provided on the first motor output shaft, a second gear is provided on the rotating wheel shaft, and the first gear and the second gear mesh with each other ;

Engaging the engine and the rotating wheel shaft when the first clutch is in operation; locking the sun gear and the ring gear when the second clutch is in operation;

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

The hybrid drive system further includes an intermediate shaft, and a third gear is provided on the intermediate shaft, and the third gear and the planet carrier mesh with each other;

The second motor has a second motor output shaft, a fourth gear is provided on the second motor output shaft, and the fourth gear and the third gear mesh with each other.
The hybrid drive system according to claim 3, wherein the hybrid drive system further comprises a differential, a differential gear is provided on the differential, and a first gear is provided on the intermediate shaft. Five gears, the fifth gear and the differential gear mesh with each other.
The hybrid drive system according to claim 3, wherein the hybrid drive system has a single-motor pure electric mode, a dual-motor pure electric first-speed mode, a dual-motor pure electric second-speed mode, an extended range mode, and an engine Single drive first gear mode, engine single drive second gear mode, first stage hybrid mode, second stage hybrid mode and parking power generation mode.
The hybrid drive system according to claim 5, wherein in the single-motor pure electric mode, the first clutch, the second clutch, the brake or one-way clutch, the engine, and The first motor is not working, and the second motor is driven; in the dual-motor pure electric one-speed mode, the engine, the first clutch, and the second clutch are not working, and the brake Or one-way clutch works, the brake or one-way clutch brakes the ring gear, the first motor and the second motor both drive; in the two-motor pure electric two-speed mode, the engine The first clutch does not work, the brake or one-way clutch does not work, the second clutch works, the second clutch locks the sun gear and the ring gear, the first motor and the The second motors are all driven.
The hybrid drive system according to claim 5, wherein in the extended range mode, the first clutch is operated, the first clutch engages the engine and the rotating wheel shaft, and the second The clutch is not working, the brake or one-way clutch is not working, the engine drives the first motor to generate electricity, the first motor provides power to the second motor, and the second motor drives.
The hybrid drive system according to claim 5, wherein in the first-speed mode in which the engine is driven alone, the first clutch is operated, the brake or one-way clutch is operated, and the first clutch is engaged. The engine and the rotating wheel shaft, the brake or the one-way clutch brakes the ring gear, the second clutch, the first motor, and the second motor are not operated, and the engine is driven; in The first clutch and the second clutch are operated in a second-speed mode in which the engine is independently driven, the first clutch engages the engine and the rotating wheel shaft, and the second clutch locks the sun gear and the In the ring gear, none of the first motor, the second motor, and the brake or one-way clutch are operated, and the engine is driven.
The hybrid drive system according to claim 5, wherein in the first-stage hybrid mode, the first clutch is operated, the brake or one-way clutch is operated, and the first clutch is engaged with the The engine and the rotating wheel axle, the brake or one-way clutch brakes the ring gear, the second clutch is not operated, and the engine, the first motor, and the second motor are driven; In the two-stage hybrid mode, the first clutch and the second clutch work, the first clutch engages the engine and the rotating wheel shaft, and the second clutch locks the sun gear and the ring gear The brake or one-way clutch does not work, and the engine, the first motor, and the second motor are all driven.
The hybrid drive system according to claim 5, wherein in the parking power generation mode, the first clutch is operated, the first clutch engages the engine and the rotating wheel shaft, and the first The two clutches and the brake or one-way clutch do not work, and the power of the engine is transmitted to the first motor to generate electricity.
The hybrid drive system according to claim 1, wherein the first rotating element is a sun gear, the second rotating element is one of a ring gear and a planet carrier, and the third rotating element is a ring gear In contrast to the planet carrier, the switching device is a brake or a one-way clutch.
The hybrid drive system according to claim 1, wherein the first rotating element is a planet carrier, the second rotating element is one of a sun gear and a ring gear, and the third rotating element is a sun gear Unlike the ring gear, the switching device is a brake or a one-way clutch.