WO2019129000A1

WO2019129000A1 - Hybrid drive system and vehicle

Info

Publication number: WO2019129000A1
Application number: PCT/CN2018/123566
Authority: WO
Inventors: 刘静; 华煜; 柴领道; 张金涛
Original assignee: 比亚迪股份有限公司
Priority date: 2017-12-29
Filing date: 2018-12-25
Publication date: 2019-07-04
Also published as: CN207809032U

Abstract

A hybrid drive system and a vehicle, the hybrid drive system comprising: an engine (1); a clutch (11); a first motor (2), the first motor (2) generating electricity under the drive of the engine (1); a transmission, comprising a dual clutch (4), a first position gear set, a second position gear set and a transmission output shaft (10), wherein an output shaft of engine (1) is connected to an input end (41) of the dual clutch (4), a first output shaft (43) of the dual clutch (4) is connected to the first position gear set, a second output shaft (42) of the dual clutch (4) is connected to the second position gear set, the transmission output shaft (10) is connected to the first position gear set, and the transmission output shaft (10) is connected to the second position gear set; a second motor (3), a power shaft of the second motor (3) being connected to the transmission output shaft (10) by means of the clutch (11); and an output portion, used for outputting power transmitted by the transmission output shaft (10) so as to drive the vehicle.

Description

Hybrid drive system and vehicle

Cross-reference to related applications

The present application claims the priority of the Chinese patent application No. "201721923268.8", which is filed on December 29, 2017, and whose name is "hybrid drive system and vehicle", the entire contents of which are incorporated herein by reference. In the application.

Technical field

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

Background technique

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

The hybrid drive system is generally composed of an engine, a generator, an electric motor, a power source, etc., and the engine and the power source jointly provide power to the vehicle, which results in a structure that is usually complicated, takes up a large space, and has a high cost.

Summary of the invention

The present disclosure adopts the following technical solutions:

It is an object of the present disclosure to provide a hybrid drive system that is simple in construction and that is capable of achieving two-speed drive of the engine.

In order to achieve the above object, the present disclosure provides a hybrid drive system including: an engine; a clutch; a first motor, the first motor generates power by the engine; a transmission, the transmission includes a dual clutch, first a gear shifting gear set, a second gear gear set, a transmission output shaft, an output shaft of the engine being coupled to an input end of the dual clutch, a first output shaft of the dual clutch being coupled to the first gear gear a second output shaft of the dual clutch coupled to the second gear set, the transmission output shaft coupled to the first gear set, the transmission output shaft and the second gear a second motor, a power shaft of the second motor is coupled to the transmission output shaft through the clutch; an output portion for outputting power transmitted by the transmission output shaft to drive the vehicle .

In the present disclosure, the combination of the dual clutch and the two gear gear sets enables the switching of the two gears by controlling the dual clutch, and has a simple structure and convenient operation.

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

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

DRAWINGS

The drawings are intended to provide a further understanding of the disclosure, and are in the In the drawing:

1 is a schematic schematic diagram of a hybrid drive system in accordance with a first embodiment of the present disclosure;

2 is a schematic schematic diagram of a hybrid drive system in accordance with a second embodiment of the present disclosure;

3 is a schematic conceptual diagram of a hybrid drive system in accordance with a third embodiment of the present disclosure;

4 is a schematic conceptual diagram of a hybrid drive system in accordance with a fourth 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 is to be understood that the specific embodiments described herein are not to be construed

1 is a schematic conceptual diagram of a hybrid drive system in accordance with a first embodiment of the present disclosure. As shown in FIG. 1, a hybrid drive system according to a 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 portion through the transmission, and the output portion outputs power to drive the vehicle.

The transmission includes a dual clutch 4, a first gear gear set, and a second gear gear set, the dual clutch 4 being disposed on the same side of the first gear gear set and the second gear gear set. Wherein, as shown in FIG. 1, the dual clutch 4 has an input end 41, a first output shaft 43 and a second output shaft 42, 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 is shown. The shaft 43 is coupled to the first gear set and the second output shaft 42 of the dual clutch 4 is coupled to the second gear set.

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. The first output shaft 43 of the dual clutch 4 may be connected to one of the driven discs by a key, the dual clutch 4 The second output shaft 42 can be coupled to the other driven disk by a key. In general, the housing of the dual clutch 4 and the two driven discs may both be disconnected, i.e., the input end 41 is disconnected from both the first output shaft 43 and the second output shaft 42. When it is required to engage one of the driven plates, the housing can be controlled to engage with the corresponding driven plate to rotate synchronously, and the driven plate drives the corresponding output shaft to rotate synchronously, that is, the input end 41 and the first output shaft 43 and the One of the two output shafts 42 is drivingly coupled such that power transmitted from the input terminal 41 can be output through one of the first output shaft 43 and the second output shaft 42.

In particular, the housing of the dual clutch 4 can also be engaged with the two driven disks at the same time, that is, the input end 41 can also be in driving connection with the first output shaft 43 and the second output shaft 42 at the same time, so that the input end 41 is transmitted. Power can be output through both the first output shaft 43 and the second output shaft 42 at the same time.

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 41 and the two outputs can be The axes are all disconnected and the input 41 is switched between a plurality of modes, such as one of the two output shafts.

In the present disclosure, the combination of the dual clutch 4 and the two gear sets makes it possible to switch between the two gears by controlling the dual clutch 4. In some embodiments, when the transmission is required to input power in the first gear, the housing of the dual clutch 4 can be controlled to engage with the driven disk corresponding to the first output shaft 43 such that the input 41 of the dual clutch 4 is The first output shaft 43 is drivingly connected; when the transmission is required to input power in the second gear, the casing of the dual clutch 4 can be controlled to engage with the driven plate corresponding to the second output shaft 42, so that the input end 41 of the dual clutch 4 It is drivingly connected to the second output shaft 42.

The first gear gear set includes a first driving gear 5 and a first driven gear 6, and the first driving gear 5 and the first driven gear 6 may be directly engaged or may be meshed with the intermediate gear, thereby transmitting through the intermediate gear connection. The second gear gear set includes a second driving gear 7 and a second driven gear 8, and the second driving gear 7 and the second driven gear 8 may be directly engaged or may be meshed with the intermediate gear, thereby being transmitted through the intermediate gear connection. The first gear gear set may be a low gear gear set, and the second gear gear set may be a high gear gear set, but the disclosure is not limited thereto, and in other embodiments, the first gear gear set may be high The gear set, the second gear set can be a low gear set.

The transmission may also include a transmission output shaft 10, each of which is mounted on the transmission output shaft 10 such that the transmission output shaft 10 can be coupled to the first driven gear 6 and the second driven gear 8 synchronous rotation. Both the power from the first gear set and the power from the second gear set are output outward through the transmission output shaft 10.

The hybrid drive system also includes a first motor 2 and a second motor 3. The first motor 2 can generate electricity either by the engine 1 or as an electric motor to drive the vehicle. Similarly, the second motor 3 can be used to drive the vehicle as well as to generate electricity.

In the first embodiment shown in FIG. 1, the first electric machine 2 is located between the engine 1 and the transmission, one end of the power shaft of the first electric machine 2 is connected to the output shaft of the engine 1, and the other end is input to the dual clutch 4. The ends 41 are connected, and the rotational speed of the first motor 2 is equal to the rotational speed of the engine 1.

In the first embodiment shown in FIG. 1, the first transmission gear 12 is mounted on the power shaft of the second motor 3, the first transmission gear 12 is meshed with the second transmission gear 13, and the second transmission gear 13 is disposed in the transmission. One end of the output shaft 10, the second transmission gear 13 and the transmission output shaft 10 are connected by a clutch 11. By providing the clutch 11, so that in the pure fuel operating conditions (including the pure fuel driving condition and the pure fuel generating condition), the second motor 12 can be disengaged from the transmission output shaft 10 by controlling the clutch 11 to be disengaged, thereby reducing Small load to improve work efficiency.

The output is configured to transmit power output by the transmission to the wheels of the vehicle. For example, the output portion may include an output gear 14 and a differential 15. The output gear 14 is mounted on the transmission output shaft 10 and rotates in synchronization with the transmission output shaft 10, and the output gear 14 meshes with the main reduction gear 16 of the differential 15. The function of the differential 15 is to roll the left and right wheels at different angular velocities when the vehicle is turning or driving on an uneven road surface to ensure a pure rolling motion between the wheels on both sides and the ground. The differential 15 is provided with a main reduction gear 16 which can be arranged, for example, on the housing of the differential 15.

2 is a schematic schematic diagram of a second embodiment in accordance with the present disclosure. The second embodiment differs from the first embodiment mainly in that, in the second embodiment, the power shaft of the second motor 3 is sleeved on the second output shaft 42 of the dual clutch 4, so that the hybrid drive system The structure is more compact and easy to arrange on the whole vehicle.

3 is a schematic schematic diagram of a third embodiment in accordance with the present disclosure. The third embodiment differs from the first embodiment mainly in that, in the third embodiment, the power shaft of the first motor 2 and the output shaft of the engine 1 are connected by a gear speed increasing mechanism such that the first motor 2 The rotational speed is greater than the rotational speed of the engine 1, thereby matching the engine 1 with the high efficiency region when the first electric machine 2 is used for the generator to improve the power generation efficiency. In one embodiment, a first speed increasing gear 17 is mounted on the power shaft of the first motor 2, and a second speed increasing gear 18 is mounted on the output shaft of the engine 1, the first speed increasing gear 17 and the second speed increasing gear. 18 is engaged, and the number of teeth of the first speed increasing gear 17 is smaller than the number of teeth of the second speed increasing gear 18.

4 is a schematic schematic diagram of a fourth embodiment in accordance with the present disclosure. The fourth embodiment differs from the first embodiment mainly in that, in the fourth embodiment, the power shaft of the second motor 3 is in line with the transmission output shaft 10, and the power shaft and the transmission of the second motor 3 The output shaft is connected by a clutch 11.

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

First, the second motor 3 pure electric working conditions. The input end 41 of the control dual clutch 4 and the two output shafts are both disconnected, neither the engine 1 nor the first motor 2 is operated, and the second motor 3 drives the wheels through the differential 15. This condition is mainly used for uniform speed or urban road surface, and the battery has a high power. The advantage of this condition is that the second motor 3 is directly driven, the transmission chain is the shortest, and the components involved in the operation are the least, and the highest transmission efficiency and the minimum noise can be achieved.

Second, the dual electric motor pure electric working conditions. The second motor 3 is a main power source and has full power output; the first motor 2 is an auxiliary power source and limits power output. The input 41 of the control dual clutch 4 is connected to one of the two output shafts. The two motors adjust the speed to ensure that the angular velocity transmitted to the transmission output shaft 10 is uniform. This working condition is mainly used for large load situations such as acceleration, climbing, overtaking, high speed, etc., and the battery power is high. This condition has better power performance than single-motor drive. Compared with hybrid power, it has better economy and lower noise. The typical application that can highlight its advantages is the steep slope (panshan road). Congested road conditions.

Third, parallel working conditions. The engine 1, the first motor 2 and the second motor 3 each drive a wheel. The two motors are adjustable to match the angular velocity of the transmission output shaft 10. The advantage of this condition is that the three-engine engine 1, the first motor 2 and the second motor 3 are simultaneously driven, and the maximum dynamic performance can be exerted.

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

5. Engine 1 independent driving conditions. The input end 41 of the control dual clutch 4 is connected to one of the two output shafts, and the first motor 2 and the second motor 3 are both inoperative, and the gear shift can be realized by the dual clutch 4.

Sixth, the engine 1 drives the charging condition. The first motor 2 is simultaneously driven to generate electricity based on the independent driving conditions of the engine 1.

Seven, braking / deceleration feedback conditions. The second motor 3 generates electricity when the vehicle brakes. This condition is mainly used for downhill, braking or deceleration of vehicles. The advantage of this condition is that the maximum energy of the feedback is achieved during deceleration or braking.

Eight, mixed working conditions. The engine 1 drives the first electric machine 2 to generate electricity on the one hand, and transmits power to the differential 15 through the dual clutch 4 and the gear shifting group to drive the wheels, and the second electric machine 3 drives the wheels through the differential 15 on the other hand. This working condition is mainly used for large load situations such as acceleration and climbing, and the power is not much. The advantage of this condition is that the entire power of the engine 1 can be exerted, and the power of the vehicle can be ensured, and power generation can be simultaneously performed to maintain the power of the battery.

In the present disclosure, by cleverly combining the dual clutch 4 and the two gear shifting gears, it is possible to obtain a two-speed transmission which is simple in structure and convenient in operation. Since the transmission can provide two gear positions, the rotation speed and torque of the engine 1 can be adjusted to some extent, and the working efficiency of the engine 1 can be improved.

In the present disclosure, the gear shifting of the transmission is achieved by the dual clutch 4, which is capable of allowing the engagement process of one driven disk to overlap with the disconnection process of the other driven disk when the shifting is switched, thereby avoiding The instantaneous interruption of torque transmission ensures the smooth shifting process and the smooth running of the whole vehicle. Compared to a more complex synchronizer with a mechanical structure, the dual clutch has a large advantage in both smoothness and reliability.

A hybrid drive system comprising: an engine 1; a clutch 11; a first electric machine 2, the first electric machine 2 being coupled to the engine 1 in a power coupling; and a transmission including a dual clutch 4, a first gear a set, a second gear gear set, a transmission output shaft 10, an output shaft of the engine 1 being coupled to an input 41 of the dual clutch 4, a first output shaft 43 of the dual clutch 4 being coupled to the first a gear gear set, a second output shaft 42 of the dual clutch 4 is coupled to the second gear gear set, the transmission output shaft 10 is coupled to the first gear gear set, the transmission output shaft 10 Connected to the second gear gear set; the second motor 3, the power shaft of the second motor 3 is connected to the transmission output shaft 10 through the clutch; the output portion, the output portion is used for outputting The power transmitted by the transmission output shaft 10 is used to drive the vehicle.

In some embodiments, the first output shaft 43 is overlaid on the second output shaft 42.

In some embodiments, one end of the power shaft of the first electric machine 2 is coupled to the output shaft of the engine 1 and the other end is coupled to the input end 41 of the dual clutch 4.

In some embodiments, the output shaft of the engine 1 is coupled to the power shaft of the first electric machine 2 via a gear accelerating mechanism.

In some embodiments, the gear speed increasing mechanism includes a first speed increasing gear 17 and a second speed increasing gear 18 that are in mesh with each other, and the first speed increasing gear 17 is coupled to a power shaft of the first motor 2, The second speed increasing gear 18 is coupled to an output shaft of the engine 1, wherein the number of teeth of the first speed increasing gear 17 is smaller than the number of teeth of the second speed increasing gear 18.

In some embodiments, the first range gear set includes a first drive gear 5 and a first driven gear 6, and the second range gear set includes a second drive gear 7 and a second driven gear 8, a first output shaft 43 of the dual clutch 4 is coupled to the first drive gear 5, a second output shaft 42 of the dual clutch 4 is coupled to the second drive gear 7, the transmission output shaft 10 and The first driven gear 6 is connected, and the transmission output shaft 10 and the second driven gear 8 are connected.

In some embodiments, the power shaft of the second electric machine 3 is coupled to the first transfer gear 12, the first transfer gear 12 is meshed with the second transfer gear 13, and the second transfer gear 13 is disposed at the transmission One end of the output shaft 10 is connected to the transmission output shaft 10 via the clutch 11.

In some embodiments, the power shaft of the second electric machine 3 is sleeved on the second output shaft 42 of the dual clutch 4.

In some embodiments, the power shaft of the second electric machine 3 is in line with the transmission output shaft 10.

A vehicle comprising the hybrid drive system of any of the above.

The 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 in the above embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the scope of the technical idea of the present disclosure. These simple variations are all within the scope of the disclosure.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not be further described in various possible combinations.

In addition, any combination of various embodiments of the present disclosure may be made as long as it does not deviate from the idea of the present disclosure, and should also be regarded as the disclosure of the present disclosure.

Claims

A hybrid drive system, comprising:

Engine (1);

Clutch (11);

a first motor (2), the first motor (2) being coupled to the engine (1);

a transmission comprising a dual clutch (4), a first gear gear set, a second gear gear set, a transmission output shaft (10), an output shaft of the engine (1) and the dual clutch (4) The input end (41) is connected, the first output shaft (43) of the dual clutch (4) is connected to the first gear gear set, and the second output shaft (42) of the dual clutch (4) is connected To the second gear set, the transmission output shaft (10) is coupled to the first gear gear set, and the transmission output shaft (10) is coupled to the second gear gear set;

a second motor (3), a power shaft of the second motor (3) is coupled to the transmission output shaft (10) through the clutch;

An output portion for outputting power transmitted by the transmission output shaft (10) to drive the vehicle.
The system of claim 1 wherein said first output shaft (43) is sleeved over said second output shaft (42).
System according to claim 1 or 2, characterized in that one end of the power shaft of the first electric machine (2) is connected to the output shaft of the engine (1) and the other end is connected to the double clutch (4) The input (41) is connected.
System according to claim 1 or 2, characterized in that the output shaft of the engine (1) is connected to the power shaft of the first electric machine (2) via a gear accelerating mechanism.
The system according to claim 4, wherein said gear speed increasing mechanism comprises a first speed increasing gear (17) and a second speed increasing gear (18) that mesh with each other, said first speed increasing gear (17) a connection to a power shaft of the first electric machine (2), the second speed increasing gear (18) being coupled to an output shaft of the engine (1), wherein the first speed increasing gear (17) The number of teeth is smaller than the number of teeth of the second step-up gear (18).
The system according to any one of claims 1 to 5, wherein the first gear gear set comprises a first drive gear (5) and a first driven gear (6), the second gear The bit gear set includes a second drive gear (7) and a second driven gear (8), the first output shaft (43) of the dual clutch (4) being coupled to the first drive gear (5), a second output shaft (42) of the dual clutch (4) is coupled to the second drive gear (7), the transmission output shaft (10) is coupled to the first driven gear (6), the transmission output The shaft (10) is coupled to the second driven gear (8).
System according to any of the claims 1-6, characterized in that the power shaft of the second electric machine (3) is connected to a first transmission gear (12), the first transmission gear (12) and a second transmission gear (13) is engaged, the second transmission gear (13) is disposed at one end of the transmission output shaft (10), and the second transmission gear passes through the clutch (11) and the transmission output shaft (10) Connected.
The system according to claim 7, characterized in that the power shaft of the second electric machine (3) is sleeved on the second output shaft (42) of the dual clutch (4).
System according to any of the claims 1-6, characterized in that the power shaft of the second electric machine (3) is situated on the same line as the transmission output shaft (10).
A vehicle characterized by comprising the hybrid drive system according to any one of claims 1-9.