Power backflow stepless speed change dynamic coupling and transmission system of hybrid electric vehicle

Abstract

The invention discloses a power backflow stepless speed change dynamic coupling and transmission system of a hybrid electric vehicle, and belongs to the field of hybrid electric vehicles. The device comprises a power source device, a power coupling device and a variable speed transmission device. According to the power backflow stepless speed change power coupling and transmission system of the hybrid electric vehicle, the power backflow function of the power backflow stepless speed change power coupling and transmission system can improve the dynamic property of the vehicle, the stepless speed change function can enable more power sources to work in an efficient area, and therefore the economical efficiency of the vehicle is improved; the four power sources including the engine, the ISG motor and the two driving motors are matched with the clutch, a hybrid driving working mode, a pure electric driving working mode and an engine independent driving working mode can be achieved, the overall performance of the vehicle can be improved through the multiple different working modes, and the service life of the vehicle is prolonged. And the hybrid electric vehicle can operate with good dynamic property and economical efficiency.

Description

Technical Field

[0001] The invention belongs to the field of hybrid electric vehicles, and in particular relates to a power reflux continuously variable speed power coupling and transmission system of a hybrid electric vehicle. Background Art

[0002] Electrification is one of the most important development trends in the automobile industry. Hybrid vehicles are a very important type of vehicle in the process of electrification. They have the advantages of high reliability and long driving range of fuel vehicles and low energy consumption and pollution-free of pure electric vehicles. Therefore, hybrid vehicles have received widespread attention.

[0003] The power system of hybrid vehicles is divided into series hybrid system, parallel hybrid system and hybrid system. In the parallel and hybrid power systems, the engine and the electric motor need to be power coupled and the power needs to be variable speed transmitted.

[0004] The power coupling forms of multiple power sources currently include torque coupling, speed coupling, traction coupling and mixed coupling. Torque coupling is mainly achieved through parallel shaft gears, speed coupling is mainly achieved through planetary gear transmissions, and traction coupling is achieved through the driving force provided to each wheel by the ground. The speed transmission device has parallel shaft speed transmission, ECVT with planetary gear combination and other structural forms.

[0005] Power coupling and power transmission system is one of the most important components of hybrid vehicles. The design goal of this system is high efficiency and reliability. Continuously variable transmission can make the power source work more in the high efficiency range, and torque coupling can obtain greater output torque. Summary of the invention

[0006] In view of the above technical problems existing in the prior art, the present invention proposes a power return continuously variable speed power coupling and transmission system for a hybrid electric vehicle, which has a reasonable design, overcomes the shortcomings of the prior art, and has good effects.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A power return type continuously variable speed power coupling and transmission system for a hybrid electric vehicle comprises a power source device, a power coupling device and a speed transmission device; wherein:

[0009] A power source device is configured to realize the functions of driving, power generation and braking energy recovery; it comprises an engine (1), an ISG (Integrated Starter and Generator) motor (2), a first drive motor (6) and a second drive motor (16);

[0010] A power coupling device is configured to achieve power coupling between the engine (1) and the second drive motor (16), and between the first drive motor (6) and the second drive motor (16), and can achieve stepless speed regulation;

[0011] A speed transmission device, configured to realize a pure metal belt type continuously variable transmission mode, a planetary gear power return continuously variable transmission mode and a pure electric drive working mode according to different working states of the clutch; comprising parallel shaft gears, a planetary gear, three clutches, a drive axle assembly (9) and a metal belt type continuously variable transmission (4);

[0012] A clutch configured to switch between various working modes;

[0013] The planetary gear is configured to realize a power return continuously variable speed mode and a pure electric drive working mode;

[0014] The three clutches are respectively a first clutch (3), a second clutch (10) and a third clutch (14);

[0015] When the third clutch (14) is engaged and the second clutch (10) is disconnected, the speed transmission device enters a power reflux continuously variable speed mode; when the third clutch (14) is disconnected and the second clutch (10) is engaged, the speed transmission device enters a metal belt type continuously variable speed mode; when the first clutch (3) is disconnected and the engine (1) is not involved in the operation, the speed transmission device enters a pure electric drive mode;

[0016] A planetary gear, comprising a planetary gear ring (7), a planetary gear sun gear (11) and a planetary gear carrier (12); the planetary gear carrier (12) is connected to the planetary gear ring (7) and the planetary gear sun gear (11) through gears, the planetary gear ring (7) is connected to the power input end of the drive axle assembly (9), the planetary gear sun gear (11) is connected to the power input end of the drive axle assembly (9) through a second clutch (10), and is also connected to a driven wheel of a metal belt type continuously variable transmission (4);

[0017] The parallel shaft gear comprises a power return mode power input end driving gear (5), a power return mode power input end driven gear (15) and a power return mode planetary gear power input driving gear (13); the power return mode power input end driving gear (5) is connected to a first drive motor (6) and a driving pulley of a metal belt type continuously variable transmission (4); the power return mode power input end driving gear (5) is meshed with the power return mode power input end driven gear (15), and power is transmitted to the power return mode planetary gear power input driving gear (13) through a third clutch (14); at the same time, the power return mode planetary gear power input driving gear (13) is connected to the planetary gear planet carrier (12) of the planetary gear, and power is input to the planetary gear;

[0018] The engine (1) is connected to an input end of a metal belt type continuously variable transmission (4) through a first clutch (3); an ISG motor (2) is connected to the engine (1) and the first clutch (3) respectively, and is used to start the engine (1), assist power output and regenerate power; a first drive motor (6), a driving pulley of the metal belt type continuously variable transmission (4) and a driving gear (5) at a power return mode power input end are coaxially fixedly connected, and at the same time, the driving gear (5) at the power return mode power input end is meshedly connected with a driven gear (15) at the power return mode power input end; a second drive motor (16) is connected to an output end of the metal belt type continuously variable transmission (4), and the output end of the metal belt type continuously variable transmission (4) is connected to a drive axle assembly (9) through a second clutch (10).

[0019] Preferably, under the cooperation of the three clutches, the power of the engine (1) and the first drive motor (6) can be transmitted to the drive axle assembly (9) through the metal belt type continuously variable transmission (4); under the cooperation of the three clutches, the power of the engine (1) and the first drive motor (6) can be transmitted to the drive axle assembly (9) through the parallel shaft gear, the planetary gear carrier (12) and the planetary gear ring (7), and part of the power can also be returned to the parallel shaft gear (5) through the planetary gear sun gear (11) and the metal belt type continuously variable transmission (4) to realize power reflux. Therefore, the power reflux continuously variable speed function can be realized in this mode;

[0020] The first drive motor (6) and the second drive motor (16) can be power coupled via a metal belt type continuously variable transmission (4), thereby directly transmitting power to the drive axle assembly (9);

[0021] The engine (1) and the second drive motor (16) can be coupled in power through a metal belt type continuously variable transmission (4), thereby directly transmitting the power to the drive axle assembly (9);

[0022] The second drive motor (16) can directly transmit power to the drive axle assembly (9) through the second clutch (10).

[0023] Preferably, different combinations of the power source device and the clutch in the speed transmission device can realize a variety of driving working modes, and the working mode involving the power coupling device and the planetary gear in the speed transmission device can realize the function of power reflux stepless speed change.

[0024] Preferably, when the vehicle's running resistance increases and the vehicle speed decreases, the power in the planetary gear is input from the planetary gear carrier (12) and output from the planetary gear ring (7) and the planetary gear sun gear (11), wherein the power output from the planetary gear ring (7) enters the drive axle assembly (9) to drive the vehicle, and the power output from the planetary gear sun gear (11) enters the output end of the metal belt type continuously variable transmission (4), and the power flows back to the input end of the metal belt type continuously variable transmission (4), and merges with the power output from the engine (1), the ISG motor (2), the first drive motor (6) and the second drive motor (16), and passes through the parallel shaft gear and the third clutch (14), and the power flows back to the third planetary gear carrier (12).

[0025] Preferably, the engine (1), the ISG motor (2) and the first drive motor (6) can be driven in combination or individually, and a power reflux continuously variable speed drive working mode is realized when the second clutch (10) is disengaged and the third clutch (14) is engaged, and a pure metal belt continuously variable speed drive working mode is realized when the second clutch (10) is engaged and the third clutch (14) is disengaged; the second drive motor (16) can participate in the driving of the above two continuously variable speed working modes, and can also be connected to the drive axle assembly (9) when the first clutch (3) and the third clutch (14) are disengaged and the second clutch (10) is engaged, so as to realize a single direct drive working mode.

[0026] Preferably, as long as one of the engine (1) and the ISG motor (2) is involved in driving, the first clutch (3) is engaged; when neither the engine (1) nor the ISG motor (2) is involved in driving, the first clutch (3) is disengaged; when the ISG motor (2) starts the engine, the first clutch (3) is disengaged, and when the ISG motor (2) regenerates electricity, the first clutch (3) is engaged.

[0027] Preferably, the system further comprises a wheel (8), wherein the wheel (8) is connected to the drive axle assembly (9) and is in contact with the road surface on which the vehicle is traveling.

[0028] Beneficial technical effects brought by the present invention:

[0029] The power return continuously variable power coupling and transmission system of the hybrid vehicle of the present invention has a power return function that can improve the power of the vehicle, and a continuously variable function that can make the power source work more in the high-efficiency area, thereby improving the economy of the vehicle; the present invention has four power sources, namely, an engine, an ISG motor and two drive motors, which cooperate with the clutch to realize a hybrid drive working mode, a pure electric drive working mode, and an engine-only drive working mode. A variety of different working modes can improve the overall performance of the vehicle, and enable the hybrid vehicle to operate with good power and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention.

[0031] Among them, 1-engine; 2-ISG motor; 3-first clutch; 10-second clutch; 14-third clutch; 4-metal belt continuously variable transmission; 5-power reflux mode power input end driving gear; 6-first drive motor; 7-planetary gear ring; 8-wheel; 9-drive axle assembly; 11-planetary gear sun gear; 12-planetary gear carrier; 13-power reflux mode planetary gear power input driving gear; 15-power reflux mode power input end driven gear; 16-second drive motor. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0033] A power return type continuously variable speed power coupling and transmission system for a hybrid electric vehicle comprises a power source device, a power coupling device and a speed transmission device; wherein:

[0034] A power source device is configured to realize the functions of driving, power generation and braking energy recovery; it includes an engine 1, an ISG motor 2, a first drive motor 6 and a second drive motor 16;

[0035] A power coupling device is configured to achieve power coupling between the engine 1 and the second drive motor 16, and between the first drive motor 6 and the second drive motor 16, and can achieve stepless speed regulation;

[0036] The speed transmission device is configured to realize a pure metal belt type continuously variable transmission mode, a planetary gearbox power return continuously variable transmission mode and a pure electric drive working mode according to different working states of the clutch; it includes parallel shaft gears, a planetary gearbox, three clutches, a drive axle assembly 9 and a metal belt type continuously variable transmission 4; the metal belt type continuously variable transmission 4 also has a certain power coupling function.

[0037] A clutch configured to switch between various working modes;

[0038] The planetary gear is configured to realize a power return continuously variable speed mode and a pure electric drive working mode;

[0039] The three clutches are the first clutch 3, the second clutch 10 and the third clutch 14;

[0040] When the third clutch 14 is engaged and the second clutch 10 is disconnected, the speed transmission device enters the power return continuously variable speed mode; when the third clutch 14 is disconnected and the second clutch 10 is engaged, the speed transmission device enters the metal belt type continuously variable speed mode; when the first clutch 3 is disconnected and the engine 1 is not involved in the work, the speed transmission device enters the pure electric drive mode;

[0041] The planetary gear comprises a planetary gear ring 7, a planetary gear sun gear 11 and a planetary gear carrier 12; the planetary gear carrier 12 is connected to the planetary gear ring 7 and the planetary gear sun gear 11 through gears, the planetary gear ring 7 is connected to the power input end of the drive axle assembly 9, the planetary gear sun gear 11 is connected to the power input end of the drive axle assembly 9 through a second clutch 10, and is fixedly connected to the driven wheel of the metal belt type continuously variable transmission 4;

[0042] The parallel shaft gears include a power return mode power input end driving gear 5, a power return mode power input end driven gear 15 and a power return mode planetary gear power input driving gear 13; the power return mode power input end driving gear 5 is connected to the first drive motor 6 and the driving pulley of the metal belt type continuously variable transmission 4; the power return mode power input end driving gear 5 is meshed with the power return mode power input end driven gear 15, and the power is transmitted to the power return mode planetary gear power input driving gear 13 through the third clutch 14, and at the same time, the power return mode planetary gear power input driving gear 13 is connected to the planetary gear planet carrier 12 of the planetary gear to input the power into the planetary gear;

[0043] The engine 1 is connected to one of the input ends of the metal belt type continuously variable transmission 4 through the first clutch 3; the ISG motor 2 is connected to the engine 1 and the first clutch 3 respectively, and is used to start the engine 1, assist power output and regenerate power; the first drive motor 6, the driving pulley of the metal belt type continuously variable transmission 4 and the driving gear 5 at the power input end of the power reflow mode are coaxially fixedly connected, and at the same time, the driving gear 5 at the power input end of the power reflow mode is meshed and connected with the driven gear 15 at the power input end of the power reflow mode; the second drive motor 16 is connected to the output end of the metal belt type continuously variable transmission 4, and the output end of the metal belt type continuously variable transmission 4 is connected to the drive axle assembly 9 through the second clutch 10.

[0044] With the cooperation of the three clutches, the power of the engine 1 and the first drive motor 6 can be transmitted to the drive axle assembly 9 through the metal belt type continuously variable transmission 4 or the parallel shaft gear and the planetary gear. The power of the engine 1 and the first drive motor 6 can also be transmitted to the drive axle assembly 9 through the parallel shaft gear, the planetary gear carrier 12 and the planetary gear ring 7. Part of the power can also flow back to the parallel shaft gear through the planetary gear sun gear 11 and the metal belt type continuously variable transmission 4 to realize power reflux. Therefore, the power reflux continuously variable speed function can be realized in this mode.

[0045] The first drive motor 6 and the second drive motor 16 can be power coupled through the metal belt type continuously variable transmission 4, and then directly transmit the power to the drive axle assembly 9;

[0046] The engine 1 and the second drive motor 16 can be power coupled through the metal belt type continuously variable transmission 4, and then directly transmit the power to the drive axle assembly 9;

[0047] The second drive motor 16 can directly transmit power to the drive axle assembly 9 through the second clutch 10 .

[0048] Different combinations of the power source device and the clutch in the speed transmission device can realize a variety of driving working modes. The working mode involving the power coupling device and the planetary gear in the speed transmission device can realize the function of power reflux stepless speed change.

[0049] When the vehicle's driving resistance increases and the vehicle speed decreases, the power in the planetary gear is input by the planetary gear carrier 12 and output from the planetary gear ring 7 and the planetary gear sun gear 11. The power output by the planetary gear ring 7 enters the drive axle assembly 9 to drive the vehicle, and the power output by the planetary gear sun gear 11 enters the output end of the metal belt type continuously variable transmission 4. The power flows back to the input end of the metal belt type continuously variable transmission 4, and merges with the power output by the engine 1, the ISG motor 2, the first drive motor 6 and the second drive motor 16. After passing through the parallel shaft gear and the third clutch 14, the power flows back to the third planetary gear carrier 12.

[0050] The engine 1, ISG motor 2 and first drive motor 6 can be driven in combination or individually, and a power reflux continuously variable speed drive working mode can be realized when the second clutch 10 is disengaged and the third clutch 14 is engaged, and a pure metal belt continuously variable speed drive working mode can be realized when the second clutch 10 is engaged and the third clutch 14 is disengaged; the second drive motor 16 can participate in the driving of the aforementioned two continuously variable speed working modes, and can also be connected to the drive axle assembly 9 when the first clutch 3 and the third clutch 14 are disengaged and the second clutch 10 is engaged, to realize a single direct drive working mode.

[0051] As long as one of the engine 1 and the ISG motor 2 is involved in driving, the first clutch 3 is engaged; when neither the engine 1 nor the ISG motor 2 is involved in driving, the first clutch 3 is disengaged; when the ISG motor 2 starts the engine, the first clutch 3 is disengaged, and when the ISG motor 2 regenerates electricity, the first clutch 3 is engaged.

[0052] The system further comprises a wheel 8, which is connected to a drive axle assembly 9 and contacts the road surface on which the vehicle is traveling.

[0053] The system has a continuously variable speed function, which enables the power source to work in a high-efficiency range, and the vehicle has a power reflux function when the vehicle is under heavy load, which can increase the output torque and balance with the external load, thereby achieving a relatively stable vehicle speed. The present invention application provides a relatively new type of power coupling transmission device with continuously variable speed function for hybrid vehicles.

[0054] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A power return type continuously variable transmission power coupling and transmission system for a hybrid electric vehicle, characterized in that: It includes a power source device, a power coupling device and a speed transmission device; wherein, A power source device is configured to realize the functions of driving, power generation and braking energy recovery; comprising an engine (1), an ISG motor (2), a first drive motor (6) and a second drive motor (16); A power coupling device is configured to achieve power coupling between the engine (1) and the second drive motor (16), and between the first drive motor (6) and the second drive motor (16), and can achieve stepless speed regulation; A speed transmission device, configured to realize a pure metal belt type continuously variable transmission mode, a planetary gear power return continuously variable transmission mode and a pure electric drive working mode according to different working states of the clutch; comprising parallel shaft gears, a planetary gear, three clutches, a drive axle assembly (9) and a metal belt type continuously variable transmission (4); A clutch configured to switch between various working modes; The planetary gear is configured to realize a power return continuously variable speed mode and a pure electric drive working mode; The three clutches are respectively a first clutch (3), a second clutch (10) and a third clutch (14); When the third clutch (14) is engaged and the second clutch (10) is disconnected, the speed transmission device enters a power reflux continuously variable speed mode; when the third clutch (14) is disconnected and the second clutch (10) is engaged, the speed transmission device enters a metal belt type continuously variable speed mode; when the first clutch (3) is disconnected and the engine (1) is not involved in the operation, the speed transmission device enters a pure electric drive mode; A planetary gear, comprising a planetary gear ring (7), a planetary gear sun gear (11) and a planetary gear carrier (12); the planetary gear carrier (12) is connected to the planetary gear ring (7) and the planetary gear sun gear (11) through gears, the planetary gear ring (7) is connected to the power input end of the drive axle assembly (9), the planetary gear sun gear (11) is connected to the power input end of the drive axle assembly (9) through a second clutch (10), and is also connected to a driven wheel of a metal belt type continuously variable transmission (4); The parallel shaft gear comprises a power return mode power input end driving gear (5), a power return mode power input end driven gear (15) and a power return mode planetary gear power input driving gear (13); the power return mode power input end driving gear (5) is connected to a first drive motor (6) and a driving pulley of a metal belt type continuously variable transmission (4); the power return mode power input end driving gear (5) is meshed with the power return mode power input end driven gear (15), and power is transmitted to the power return mode planetary gear power input driving gear (13) through a third clutch (14); at the same time, the power return mode planetary gear power input driving gear (13) is connected to the planetary gear planet carrier (12) of the planetary gear, and power is input to the planetary gear; The engine (1) is connected to an input end of a metal belt type continuously variable transmission (4) through a first clutch (3); an ISG motor (2) is connected to the engine (1) and the first clutch (3) respectively, and is used to start the engine (1), assist power output and regenerate power; a first drive motor (6), a driving pulley of the metal belt type continuously variable transmission (4) and a driving gear (5) at a power return mode power input end are coaxially fixedly connected, and at the same time, the driving gear (5) at the power return mode power input end is meshedly connected with a driven gear (15) at the power return mode power input end; a second drive motor (16) is connected to an output end of the metal belt type continuously variable transmission (4), and the output end of the metal belt type continuously variable transmission (4) is connected to a drive axle assembly (9) through a second clutch (10).

2. The power return type continuously variable transmission power coupling and transmission system for hybrid electric vehicles according to claim 1, characterized in that: Under the cooperation of three clutches, the power of the engine (1) and the first drive motor (6) is transmitted to the drive axle assembly (9) through the metal belt type continuously variable transmission (4); the power of the engine (1) and the first drive motor (6) is transmitted to the drive axle assembly (9) through the parallel shaft gear, the planetary gear carrier (12) and the planetary gear ring (7), and part of the power flows back to the parallel shaft gear through the planetary gear sun gear (11) and the metal belt type continuously variable transmission (4) to realize power reflux. In this mode, the power reflux continuously variable speed function is realized; The first drive motor (6) and the second drive motor (16) are power-coupled via a metal belt-type continuously variable transmission (4), thereby directly transmitting power to the drive axle assembly (9); The engine (1) and the second drive motor (16) are power-coupled via a metal belt-type continuously variable transmission (4), thereby directly transmitting the power to the drive axle assembly (9); The second drive motor (16) directly transmits power to the drive axle assembly (9) via the second clutch (10).

3. The power return type continuously variable transmission power coupling and transmission system for hybrid electric vehicles according to claim 1, characterized in that: Different combinations of the power source device and the clutch in the speed transmission device realize a variety of driving working modes, and the working mode in which the power coupling device and the planetary gear in the speed transmission device participate realizes the function of power reflux stepless speed change.

4. The power return type continuously variable transmission power coupling and transmission system for hybrid electric vehicles according to claim 1, characterized in that: When the vehicle's running resistance increases and the vehicle speed decreases, the power in the planetary gear is input from the planetary gear carrier (12) and output from the planetary gear ring (7) and the planetary gear sun gear (11), wherein the power output from the planetary gear ring (7) enters the drive axle assembly (9) to drive the vehicle, and the power output from the planetary gear sun gear (11) enters the output end of the metal belt type continuously variable transmission (4), and the power flows back to the input end of the metal belt type continuously variable transmission (4), and converges with the power output from the engine (1), the ISG motor (2), the first drive motor (6) and the second drive motor (16), and then flows back to the third planetary gear carrier (12) through the parallel shaft gear and the third clutch (14).

5. The power return type continuously variable transmission power coupling and transmission system for hybrid electric vehicles according to claim 1, characterized in that: The engine (1), the ISG motor (2) and the first drive motor (6) are driven in combination or individually, and a power reflux continuously variable speed drive working mode is realized when the second clutch (10) is disengaged and the third clutch (14) is engaged, and a pure metal belt continuously variable speed drive working mode is realized when the second clutch (10) is engaged and the third clutch (14) is disengaged; the second drive motor (16) participates in the driving of the first two continuously variable speed working modes, and is connected to the drive axle assembly (9) when the first clutch (3) and the third clutch (14) are disengaged and the second clutch (10) is engaged, so as to realize a single direct drive working mode.

6. The power return type continuously variable transmission power coupling and transmission system for hybrid electric vehicles according to claim 1, characterized in that: As long as one of the engine (1) and the ISG motor (2) participates in driving, the first clutch (3) is engaged; when neither the engine (1) nor the ISG motor (2) participates in driving, the first clutch (3) is disengaged; when the ISG motor (2) starts the engine, the first clutch (3) is disengaged, and when the ISG motor (2) regenerates electricity, the first clutch (3) is engaged.

7. The power return type continuously variable transmission power coupling and transmission system for hybrid electric vehicles according to claim 1, characterized in that: The system also includes a wheel (8), which is connected to the drive axle assembly (9) and is in contact with the road surface on which the vehicle is traveling.

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