CN109986954A - Powertrain and Vehicles - Google Patents

Abstract

This disclosure relates to a kind of power-driven system and vehicle.The system comprises: engine；Speed changer, the speed changer includes double clutch, the first gear gear set, the second gear gear set, the output shaft of the engine is connected with the input terminal of the double clutch, first output shaft of the double clutch is connected to the first gear gear set, and the second output shaft of the double clutch is connected to the second gear gear set；Output section, the output section are used to export the power from the first gear gear set or the transmitting of the second gear gear set to drive vehicle.

Description

Powertrain and Vehicles

technical field

The present disclosure relates to a power drive system and a vehicle.

Background technique

In today's world, human beings are faced with two major challenges, energy shortage and environmental degradation. Traditional automobiles are increasingly plagued by the oil crisis. Energy conservation and environmental protection have gradually become the development theme of the automobile industry. In recent years, hybrid vehicles with two different power sources to reduce fuel consumption and emissions have been developed and applied, and put into commercial production to the market.

The hybrid drive system is generally composed of an engine, a generator, an electric motor, a power source, etc. The engine and the power source jointly provide power for the vehicle, which results in a complex structure, a large space occupation, and a high cost.

SUMMARY OF THE INVENTION

The purpose of the present disclosure is to provide a power drive system, which has a simple structure and can realize two-speed driving of the engine.

In order to achieve the above object, the present disclosure provides a power drive system, comprising: an engine; a transmission, wherein the transmission includes a dual clutch, a first gear set, and a second gear The input ends of the dual clutch are connected, the first output shaft of the dual clutch is connected to the first gear set, and the second output shaft of the dual clutch is connected to the second gear set; the output part, The output part is used to output the power transmitted from the first gear set or the second gear set to drive the vehicle.

Optionally, the transmission includes a transmission output shaft, the transmission output shaft is connected to the first gear set, the transmission output shaft is connected to the second gear set, and the transmission output shaft is connected to the first gear set. The output portion transmits power.

Optionally, the first gear set includes a first driving gear and a first driven gear, the second gear set includes a second driving gear and a second driven gear, and the first gear of the dual clutch is An output shaft is connected to the first drive gear, the second output shaft of the dual clutch is connected to the second drive gear, the first output shaft is idle on the second output shaft, and the transmission The output shaft is connected with the first driven gear, and the transmission output shaft is connected with the second driven gear.

Optionally, the system further includes a first motor capable of generating electricity driven by the engine.

Optionally, the output shaft of the engine is connected to one end of the power shaft of the first motor, and the other end of the first motor is connected to the input end of the dual clutch.

Optionally, the dual clutch is integrated in the first motor, and the power shaft of the first motor is integrated with the input end of the dual clutch.

Optionally, the system further includes a clutch through which the output shaft of the engine is connected with one end of the power shaft of the first motor.

Optionally, the system further includes a second motor, and the output part is further configured to output power from the second motor to drive the vehicle.

Optionally, the power shaft of the second motor is coaxially connected to the second output shaft of the dual clutch.

Optionally, the power shaft of the second motor is coaxially connected to the transmission output shaft.

In the present disclosure, through the combination of the dual clutch and the two gear sets, the switching of the two gears can be realized by controlling the dual clutch, the structure is simple, and the operation is convenient.

The present disclosure also provides a vehicle including the power drive system as described above.

Other features and advantages of the present disclosure will be described in detail in the detailed description that follows.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and together with the following detailed description, are used to explain the present disclosure, but not to limit the present disclosure. In the attached image:

FIG. 1 is a schematic schematic diagram of a power drive system according to a first embodiment of the present disclosure;

2 is a schematic schematic diagram of a power drive system according to a second embodiment of the present disclosure;

3 is a schematic schematic diagram of a power drive system according to a third embodiment of the present disclosure;

4 is a schematic schematic diagram of a power drive system according to a fourth embodiment of the present disclosure;

FIG. 5 is a schematic schematic diagram of a power drive system according to a fifth embodiment of the present disclosure.

Detailed ways

The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, but not to limit the present disclosure.

FIG. 1 is a schematic schematic diagram of a power drive system according to a first embodiment of the present disclosure. As shown in FIG. 1 , the power drive system according to the first embodiment of the present disclosure includes an engine 1 , a transmission, and an output. The power of the engine 1 is transmitted to the output part through the transmission, and the output part outputs the power to drive the vehicle.

The transmission includes a dual clutch 4, a first gear set, and a second gear set. Among them, as shown in FIG. 1 , the dual clutch 4 has an input end 41 , a first output shaft 42 and a second output shaft 43 , the output shaft of the engine 1 is connected to the input end 41 of the dual clutch 4 , and the first output of the dual clutch 4 The shaft 42 is connected to the first gear set and the second output shaft 43 of the dual clutch 4 is connected to the second gear set. The dual clutch 4 is arranged on the same side of the first gear set and the second gear set, and the first output shaft 42 is idle on the second output shaft 43, so that the structure of the power drive system is more compact, and it is convenient for the whole Arrangement in the car.

The input end 41 of the dual clutch 4 may be the housing of the dual clutch 4, and the dual clutch 4 further includes two driven discs, and the first output shaft 42 of the dual clutch 4 may be connected with one of the driven discs through a key. The dual clutch 4 The second output shaft 43 can be connected with another driven plate through a key. Generally, the housing of the dual clutch 4 may be disconnected from the two driven discs, that is, the input end 41 is disconnected from both the first output shaft 42 and the second output shaft 43 . When one of the driven disks needs to be engaged, the casing can be controlled to engage with the corresponding driven disk to rotate synchronously, and the driven disk drives the corresponding output shaft to rotate synchronously, that is, the input end 41 is connected to the first output shaft 42 and the second output shaft One of the two output shafts 43 is drive-connected, so that the power from the input end 41 can be output through one of the first output shaft 42 and the second output shaft 43 .

It should be understood that the specific engagement state of the dual clutch 4 is affected by the control strategy. For those skilled in the art, the control strategy can be adaptively set according to the actual required transmission mode, so that the input end 41 can be connected to the two output All shafts are disconnected and the input 41 is drive-connected to one of the two output shafts to switch between modes.

The first gear set includes a first driving gear 5 and a first driven gear 6. The first driving gear 5 and the first driven gear 6 can be directly meshed, or both can be meshed with the intermediate gear, so as to transmit the transmission through the intermediate gear. connect. The second gear set includes a second driving gear 7 and a second driven gear 8. The second driving gear 7 and the second driven gear 8 can be directly meshed with each other, or both can be meshed with an intermediate gear, so that the transmission is transmitted through the intermediate gear. connect. The first gear set may be a low gear set, and the second gear set may be a high gear set, but the present disclosure is not limited thereto, and in other embodiments, the first gear set may be a high gear The gear set of gears, and the gear set of the second gear can be a low-speed gear set.

The transmission may also include a transmission output shaft 9 on which the first driven gear 6 and the second driven gear 8 are mounted, so that the transmission output shaft 9 can communicate with the first driven gear 6 and the second driven gear. 8 simultaneous rotations. Whether the power from the first gear set or the power from the second gear set is outputted through the transmission output shaft 9 .

The output is configured to transmit power output from the transmission to wheels of the vehicle. For example, the output portion may include the output gear 14 , or may include the output gear 14 and the differential 16 . The output gear 14 is mounted on the transmission output shaft 9 and rotates synchronously with the transmission output shaft 9 , and the output gear 14 meshes with the final reduction gear 15 of the differential 16 . The function of the differential 16 is to make the left and right wheels roll at different angular velocities when the vehicle is turning or driving on an uneven road, so as to ensure pure rolling motion between the wheels on both sides and the ground. A final reduction gear 15 is provided on the differential gear 16 , and the final reduction gear 15 may, for example, be arranged on the housing of the differential gear 16 .

In the present disclosure, through the combination of the dual clutch 4 and the two gear sets, it is possible to realize the two-speed power output of the engine by controlling the engagement or disengagement of the dual clutch 4 .

Specifically, when the input end 41 of the dual clutch 4 is connected to the first output shaft 42 and the input end 41 of the dual clutch 4 is disconnected from the second output shaft 43, the power of the engine 1 passes through the input end 41, The first output shaft 42 of the dual clutch 4 , the first driving gear 5 , the first driven gear 6 , the transmission output shaft 9 , the output gear 14 , the final gear 15 and the differential 16 are transmitted to the wheels.

When the input end 41 of the dual clutch 4 is connected to the second output shaft 43 and the input end 41 of the dual clutch 4 is disconnected from the first output shaft 42 , the power of the engine 1 passes through the input end 41 of the dual clutch 4 and the dual clutch 4 in turn. The second output shaft 43 , the second driving gear 7 , the second driven gear 8 , the transmission output shaft 9 , the output gear 14 , the final reduction gear 15 and the differential 16 are transmitted to the wheels.

In the second embodiment shown in FIG. 2 , the power drive system may further include a first motor 2 , which can not only generate electricity driven by the engine 1 , but also act as an electric motor to drive the vehicle. In the second embodiment shown in FIG. 2 , the first motor 2 is arranged between the engine 1 and the dual clutch 4 , the output shaft of the engine 1 is connected to one end of the power shaft of the first motor 2 , and the The other end of the power shaft is connected to the input end 41 of the dual clutch 4 . By connecting the output shaft of the engine 1 and the power shaft of the first motor 2 coaxially, intermediate transmission mechanisms such as gears are omitted. On the one hand, the load can be reduced and the transmission efficiency can be improved; Modular design, it is not necessary to adjust the rotor and stator according to the arrangement of the transmission mechanism, and on the other hand, it can reduce the noise. In one embodiment, the dual clutch 4 can be integrated inside the first motor 2, and the input end 41 of the dual clutch 4 is integrated with the power shaft of the first motor 2 to reduce the axial space of the power drive system and make the The structure is more compact.

When the first motor 2 is used as an electric motor to drive the vehicle, the two-speed power output of the first motor is realized by controlling the engagement or disengagement of the dual clutch 4 . The specific control method of the dual clutch 4 is similar to that of realizing the power output of the engine in two gears, and will not be repeated here. It should be understood that whether the first motor 2 participates in driving is affected by the control strategy, and for those skilled in the art, the control strategy can be adaptively set according to the actual required transmission mode.

In the second embodiment shown in FIG. 2 , the power drive system may further include a second motor 3 , and the output part is also used to output power from the second motor 3 to drive the vehicle. The second electric machine 3 can function both as an electric motor for driving the vehicle and as a generator for power generation.

The second electric machine 3 can be coupled to the power drive system in a number of ways. In the second embodiment shown in FIG. 2 , the second gear set is arranged between the first gear set and the second motor 3 , and the power shaft of the second motor 3 is connected to the second output of the dual clutch 4 . The shaft 43 is coaxially connected, and the power shaft of the second motor 3 rotates synchronously with the second driving gear 7 . In the second embodiment of the present disclosure, the engine 1 has seven operating modes:

a. Engine range extension power generation mode: the engine 1 alone drives the first motor 2 to generate electricity;

b. Engine low-speed extended-range driving mode: the engine 1 drives the vehicle and drives the first motor 2 and the second motor 3 to generate electricity;

c. Engine medium and low speed extended range drive mode: the engine 1 drives the vehicle and drives the first motor 2 to generate electricity, and does not drive the second motor 3 to generate electricity;

d. Engine direct drive mode: the engine 1 only drives the vehicle and does not drive the first motor 2 and the second motor 3 to generate electricity;

e. Engine medium and high-speed extended-range driving mode: the engine 1 and the second motor 3 jointly drive the vehicle, and the engine 1 simultaneously drives the first motor 2 to generate electricity;

f. Engine high-speed hybrid drive mode 1: The engine 1 and the second motor 3 jointly drive the vehicle, and the engine 1 does not drive the first motor 2 to generate electricity;

g. Engine high-speed hybrid drive mode 2, the engine 1, the first motor 2 and the second motor 3 jointly drive the vehicle.

In the second embodiment of the present disclosure, the first motor 2 has three working modes:

a. The engine charges the first motor alone. In this mode, the engine 1 charges the first motor 2 alone;

b. Engine-driven charging mode, in this mode, the engine 1 can charge the first motor 2 while driving the vehicle. In the second embodiment of the present disclosure, the second motor 3 has four working modes:

a. Pure electric drive mode of the second motor;

b. Engine-driven charging mode, in this mode, the engine 1 can charge the second motor 2 while driving the vehicle;

c. Hybrid drive mode, in this mode, the second motor 3 and the engine 1 drive the vehicle together;

d. Brake deceleration power generation mode.

FIG. 3 is a schematic schematic diagram of a third embodiment according to the present disclosure. The main difference between the third embodiment and the second embodiment is that in the third embodiment, the power shaft of the second motor 3 is coaxially connected to the transmission output shaft 9 .

FIG. 4 is a schematic schematic diagram of a fourth embodiment according to the present disclosure. The main difference between the fourth embodiment and the second embodiment is that in the fourth embodiment, the output shaft of the engine 1 is connected with the power shaft of the first electric machine 2 through the clutch 13 . By arranging the clutch 13, when the vehicle is driven by the first motor 2, the clutch 13 can be controlled to disengage to disconnect the engine 1 from the power shaft of the first motor 2, thereby reducing the load and improving the work efficiency.

FIG. 5 is a schematic schematic diagram of a fifth embodiment according to the present disclosure. The main difference between the fifth embodiment and the fourth embodiment is that in the fifth embodiment, the power shaft of the second motor 3 is coaxially connected to the transmission output shaft 9 .

The power drive system of the present disclosure may have the following operating conditions;

1. The second motor is purely electric. The input end 41 of the control double clutch 4 and the two output shafts are disconnected, the engine 1 and the first motor 2 are not working, and the second motor 3 drives the wheels through the differential 16 . This working condition is mainly used for starting, medium and low speed or urban roads, etc., and the battery has a high power. The advantage of this working condition is that the second motor 3 is directly driven, the transmission chain is the shortest, the components involved in the work are the least, and the highest transmission efficiency and the lowest noise can be achieved.

Second, the series working condition. The input end 41 of the control double clutch 4 and the two output shafts are disconnected, the engine 1 drives the first motor 2 to generate electricity, and the second motor 3 drives the wheels.

3. Engine independent driving condition. The input end 41 of the control dual clutch 4 is connected to one of the two output shafts, the first motor 2 and the second motor 3 are not working, and the gear switching can be realized through the dual clutch 4 .

4. Engine-driven charging conditions. On the basis of the independent driving condition of the engine, the first motor 2 is simultaneously driven to generate electricity.

5. Braking/deceleration feedback conditions. The second motor 3 recovers energy and generates electricity. This condition is mainly used for vehicle downhill, braking or deceleration. The advantage of this working condition is to maximize the feedback energy when decelerating or braking.

6. Mixed working conditions. On the one hand, the engine 1 drives the first motor 2 to generate electricity, and on the other hand transmits the power to the differential 16 through the dual clutch 4 and the gear set to drive the wheels. The second motor 3 drives the wheels through the differential 16 . This working condition is mainly used in the case of large load occasions such as acceleration and climbing, and there is not much power. The advantage of this working condition is that the full power of the engine 1 can be exerted, which not only ensures the power performance of the vehicle, but also generates power at the same time to maintain the power of the battery.

In the present disclosure, by skillfully combining the dual clutch 4 with the two gear sets, a two-speed transmission with simple structure and convenient operation can be obtained. Since the transmission can provide two gears, the speed and torque of the engine 1 and/or the first electric machine 2 can be adjusted to a certain extent, and the working efficiency of the engine 1 and/or the first electric machine 2 can be improved.

In the present disclosure, the gear shift of the transmission is realized by the dual clutch 4, which can allow the engagement process of one driven plate to overlap with the disengagement process of the other driven plate during the shift switching, thereby avoiding the need for The instantaneous interruption of torque transmission ensures the smoothness of the shifting process and the running of the vehicle. Compared with synchronizers with more complex mechanical structures, dual clutches have great advantages in terms of smoothness and reliability.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure. These simple modifications all fall within the protection scope of the present disclosure.

In addition, it should be noted that each specific technical feature described in the above-mentioned specific implementation manner may be combined in any suitable manner under the circumstance that there is no contradiction. In order to avoid unnecessary repetition, various possible combinations are not described in the present disclosure.

In addition, the various embodiments of the present disclosure can also be arbitrarily combined, as long as they do not violate the spirit of the present disclosure, they should also be regarded as the contents disclosed in the present disclosure.

Claims (11)

1. a power drive system, is characterized in that, comprises: engine (1); A transmission comprising a dual clutch (4), a first gear set, and a second gear set, the output shaft of the engine (1) is connected to the input end (41) of the dual clutch (4) , the first output shaft (42) of the dual clutch (4) is connected to the first gear set, and the second output shaft (43) of the dual clutch (4) is connected to the second gear gear set; An output part for outputting power from the first-speed gear set or the second-speed gear set to drive the vehicle. 2. The system according to claim 1, characterized in that the transmission comprises a transmission output shaft (9) connected to the first gear set, the transmission output shaft (9) being (9) is connected to the second gear set, and the transmission output shaft (9) transmits power to the output part. 3. The system according to claim 2, wherein the first gear set comprises a first driving gear (5) and a first driven gear (6), and the second gear set comprises The second driving gear (7) and the second driven gear (8), the first output shaft (42) of the double clutch (4) is connected to the first driving gear (5), the double clutch (4) ) of the second output shaft (43) is connected to the second driving gear (7), the transmission output shaft (9) is connected to the first driven gear (6), the transmission output shaft (9) connected with the second driven gear (8). 4. The system according to claim 1, characterized in that, the system further comprises a first motor (2), the first motor (2) capable of generating electricity driven by the engine (1). 5. The system according to claim 4, wherein the output shaft of the engine (1) is connected to one end of the power shaft of the first motor (2), and the power of the first motor (2) The other end of the shaft is connected with the input end (41) of the double clutch (4). 6. The system according to claim 5, characterized in that the dual clutch (4) is integrated in the first motor (2), and the power shaft of the first motor (2) is connected to the dual clutch The input terminal (41) of (4) is integrally formed. 7. The system according to claim 5, characterized in that, the system further comprises a clutch (13) through which the output shaft of the engine (1) and one end of the power shaft of the first motor (2) pass through. The clutch (13) is connected. 8. The system according to claim 1, characterized in that the system further comprises a second motor (3), and the output part is further used to output power from the second motor (3) to drive the vehicle. 9. The system according to claim 8, characterized in that the power shaft of the second motor (3) is coaxially connected with the second output shaft (43) of the dual clutch (4). 10. The system according to claim 8, characterized in that the power shaft of the second electric machine (3) is coaxially connected to the transmission output shaft (9). 11. A vehicle, characterized by comprising a power drive system according to any one of claims 1-10.