WO2023124762A1 - Dual-motor hybrid power system, control method and hybrid electric vehicle - Google Patents

Abstract

Disclosed in the present application are a dual-motor hybrid power system, a control method and a hybrid electric vehicle. The dual-motor hybrid power system comprises a differential end, a driving motor, an engine, a generator, a first connection member and a second connection member. The first connection member is in transmission connection with a differential gear; when the first connection member is in a first connected state, the first connection member can be selectively connected to a second driving path or a third driving path; and when the first connection member is in a first disconnected state, the first connection member is not connected to the second driving path or the third driving path. The second connection member is arranged on a fourth driving path; when the second connection member is in a second connected state, the engine is connected to the generator; and when the second connection member is in a second disconnected state, the engine is disconnected from the generator.

Description

Dual-motor hybrid system, control method and hybrid vehicle

This application claims priority to a Chinese patent application with application number 202111662996.9 filed with the China Patent Office on December 31, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of hybrid electric vehicles, for example, it relates to a dual-motor hybrid power system, a control method and a hybrid electric vehicle.

Background technique

With the increasingly stringent requirements of energy saving and emission reduction regulations, the new energy vehicle market is developing rapidly, especially pure electric vehicles and hybrid vehicles; however, due to factors such as short battery life, long charging time, and short battery life In the short term, it is difficult to occupy the main sales market; gasoline-electric hybrid vehicles have gradually occupied the main sales market of new energy vehicles due to the combination of the characteristics of both fuel vehicles and pure electric vehicles. Among them, the performance of a gasoline-electric hybrid vehicle depends fundamentally on the hybrid power system that provides driving force for it.

The hybrid power system includes a generator, an engine and a drive motor, and a clutch is set on the intermediate shaft of the engine to be configured to control the power on and off between the engine and the drive motor; at the same time, the engine is directly connected to the generator through a speed-increasing gear pair , to realize the function of the engine generating electricity.

However, since the engine is directly connected to the generator through the speed-increasing gear pair, that is, the engine and the generator are always connected, so that the generator cannot output driving force to the wheels of the car alone. When the driving force is used, since the engine and the generator are always connected, when the generator rotates, the engine also needs to rotate together, resulting in a large loss of rotational energy and affecting the economy of the car; moreover, when the engine directly drives the car At the same time, since the generator will also be in a state of continuous high speed at the same time to generate a large electromagnetic field, it is easy to cause the generator to generate a large back electromotive force, thereby affecting the electronic control performance of the car's controller.

Contents of the invention

The present application proposes a dual-motor hybrid power system, which can realize complete decoupling between the generator and the engine.

A two-motor hybrid system comprising:

The differential end, which includes a transmission-connected differential gear and a differential that is drive-connected to the wheels of the vehicle;

a drive motor, the power of which can be transmitted to the differential gear through a first drive path;

an engine, power of which can be transmitted through a second drive path;

A generator, the generator can provide electric energy for the drive motor, and the power of the generator can be transmitted through a third drive path, and a fourth drive for power transmission is formed between the generator and the engine path;

a first connecting piece, which is in transmission connection with the differential gear, the first connecting piece has a first connected state and a first disconnected state, when the first connecting piece is in the first connected state, The first connecting part can be selectively connected to the second driving path or the third driving path, and when the first connecting part is in the first disconnected state, the first connecting part is not connecting the second drive path and the third drive path;

a second connecting piece, which is arranged on the fourth driving path, the second connecting piece has a second connected state and a second disconnected state, when the second connecting piece is in the second connected state, The engine communicates with the generator, and when the second connecting member is in the second disconnected state, the engine is disconnected from the generator.

In one embodiment, the first connecting part is a clutch or a synchronizer, and/or the second connecting part is a clutch or a synchronizer.

In one embodiment, the dual-motor hybrid system further includes:

The first power transmission assembly is arranged at the output end of the driving motor, and the first power transmission assembly is configured to transmit the power of the driving motor to the differential gear along the first driving path.

In one embodiment, the first power transmission assembly includes:

a first gear and a second gear meshed with each other, the first gear is fixedly sleeved to the first output shaft of the drive motor;

a first transmission shaft, which is arranged parallel to the first output shaft, and the second gear is fixedly sleeved on the first transmission shaft;

The third gear is fixedly sleeved on the first transmission shaft and spaced apart from the second gear, and the third gear is meshedly connected with the differential gear.

In one embodiment, the dual-motor hybrid system further includes:

a third connecting piece, one end of the third connecting piece is fixedly connected to the differential gear, and the other end of the third connecting piece is fixedly connected to the third gear, and the third connecting piece is configured to Control the on-off of the power between the drive motor and the differential gear; the third connection has a third connection state and a third disconnection state, when the third connection is in the third disconnection state In the open state, the third gear is not connected to the differential gear, and when the third connecting member is in the third connection state, the third gear is in transmission connection with the differential gear.

In one embodiment, the third connecting member is a clutch or a synchronizer.

In one embodiment, the dual-motor hybrid system further includes:

A second power transmission assembly is disposed at the output end of the engine, and the second power transmission assembly is configured to transmit the power of the engine along the second drive path.

In one embodiment, the second power transmission assembly includes:

a fourth gear and a fifth gear meshed with each other, the fourth gear is fixedly sleeved to the second output shaft of the engine;

The second transmission shaft is arranged parallel to the second output shaft and the first transmission shaft respectively, the fifth gear gap is sleeved on the second transmission shaft, and the first connecting member is fixedly connected to On the second transmission shaft, the first connecting member can be selectively connected to the fifth gear, and a sixth gear is fixedly sleeved on the second transmission shaft, and the sixth gear is connected to the fifth gear. The differential gear meshing connection.

In one embodiment, the dual-motor hybrid system further includes:

A third power transmission assembly is disposed at the output end of the generator, and the third power transmission assembly is configured to transmit the power of the generator along the third drive path.

In one embodiment, the third power transmission assembly includes:

The seventh gear, the eighth gear and the ninth gear are sequentially meshed, the seventh gear is fixedly sleeved on the third output shaft of the generator, and the eighth gear is sleeved to the second output shaft shaft, the ninth gear gap is sleeved on the second transmission shaft, the first connecting member can be selectively connected to the ninth gear, and the third output shaft is connected to the first The two output shafts are arranged in parallel.

In one embodiment, the dual-motor hybrid system further includes:

a fourth power transmission assembly disposed in the fourth drive path, the fourth power transmission assembly configured to transmit the power of the engine to the generator, or to transmit the power of the generator to the engine.

In one embodiment, the fourth power transmission assembly includes:

The tenth gear, the tenth gear is sleeved on the third output shaft, the tenth gear is meshed with the fourth gear, and the second connecting member is arranged on the third output shaft Above, one end of the second connecting piece is fixedly connected to the seventh gear, and the other end of the second connecting piece is fixedly connected to the tenth gear; when the second connecting piece is in the second break In the open state, the seventh gear is not connected to the tenth gear, and when the second connecting member is in the second connection state, the seventh gear is in transmission connection with the tenth gear.

The present application proposes a control method for a dual-motor hybrid power system, which is simple and convenient to control, and can completely decouple the generator and the engine.

A control method based on the dual-motor hybrid system as described above, comprising:

Stop and start working mode: the first connection part is in the first disconnected state, the second connection part is in the second connection state, the drive motor does not work, the generator and the engine work; the driving force of the generator is transmitted to the engine through the fourth driving path, so that the engine is started;

Idle power generation working mode: the first connecting part is in the first disconnected state, the second connecting part is in the second connected state, the driving motor is not working, and the generator and the engine are working ; The driving force output by the engine is transmitted to the generator through the fourth driving path, so that the generator generates electricity;

Pure electric driving working mode: neither the engine nor the generator is working, the first connecting member is in the first disconnected state, and the driving motor is working; the driving force output by the driving motor is passed through the a first drive path is transmitted to the differential gear to drive the wheels;

Series drive working mode: the second connection part is in the second connection state, the first connection part is in the first disconnection state, and the engine, the generator, and the drive motor all work; The driving force output by the engine is transmitted to the generator through the fourth driving path, so that the generator generates electricity; the electric energy of the generator is provided to the driving motor, so that the driving motor generates a drive The driving force generated by the driving motor is transmitted to the differential gear through the first driving path to drive the wheels;

Engine direct drive working mode: the first connecting part is in the first connecting state, and the first connecting part is connected to the second driving path, and the second connecting part is in the second disconnected state , the generator does not work, and the engine works; the driving force output by the engine is transmitted to the differential gear through the second driving path and the first connecting member, and the driving motor rotates accordingly;

Parallel driving mode of the engine and the driving motor: the first connecting part is in the first connection state, and the first connecting part is connected to the second driving path, and the second connecting part is in the second disconnected state, the generator does not work, the drive motor and the engine work; the driving force output by the engine is transmitted to the differential gear through the second drive path and the first connecting piece , the driving force output by the driving motor is transmitted to the differential gear through the first driving path, so as to jointly drive the wheels with the power transmitted by the engine;

Drive motor and generator in parallel driving mode: the first connection part is in the first connection state, and the first connection part is connected to the third drive path, and the second connection part is in the first connection state Two off state, the engine does not work, the drive motor and the generator work; the driving force output by the drive motor is transmitted to the differential gear through the first drive path; the generator The driving force is transmitted to the differential gear through the third driving path and the first connecting member, so as to jointly drive the wheels with the power transmitted by the driving motor;

Braking energy recovery working mode: the first connecting member is in the first disconnected state, the engine and the generator are not working, and the driving motor is working; the driving force of the wheels is transmitted through the first A drive path acts on the drive motor to cause the drive motor to generate electricity.

The present application proposes a hybrid electric vehicle, which can simultaneously ensure the power and economy of the vehicle.

A hybrid electric vehicle includes a controller configured to select an operating mode of the hybrid electric vehicle based on the above-mentioned control method of a dual-motor hybrid system according to operating parameters of the hybrid electric vehicle.

In one embodiment, the hybrid electric vehicle further includes an electric energy storage device configured to provide electric energy for the drive motor and the generator, and the electric energy generated by the drive motor and the generator Can be stored in the electric energy storage device, the operating parameters of the hybrid electric vehicle include at least the vehicle speed and acceleration requirements of the hybrid electric vehicle, the power of the electric energy storage device, the mileage of the hybrid electric vehicle, the The braking state of the hybrid electric vehicle and the stepping force on the pedals of the hybrid electric vehicle.

Description of drawings

Fig. 1 is a schematic structural diagram of a dual-motor hybrid system provided by the present application;

Fig. 2 is the flow chart of a kind of parking start work mode provided by the present application;

Fig. 3 is a flow chart of an idle power generation working mode provided by the present application;

Fig. 4 is a flow chart of a pure electric drive working mode provided by the present application;

Fig. 5 is a flow chart of a serial drive working mode provided by the present application;

Fig. 6 is a flow chart of an engine direct drive working mode provided by the present application;

Fig. 7 is a flow chart of a parallel driving mode of the engine and the driving motor provided by the present application;

Fig. 8 is a flow chart of a parallel driving mode of a generator and a drive motor provided by the present application;

Fig. 9 is a flow chart of a braking energy recovery working mode provided by the present application.

Reference signs:

1-drive motor; 11-first output shaft;

2-engine; 21-second output shaft;

3-generator; 31-the third output shaft;

4-the third power transmission assembly; 41-the seventh gear; 42-the eighth gear; 43-the ninth gear;

51-the tenth gear;

6-the first power transmission assembly; 61-the first gear; 62-the second gear; 63-the first transmission shaft; 64-the third gear;

7-differential end; 71-differential gear; 72-differential;

8-second power transmission assembly; 81-fourth gear; 82-fifth gear; 83-second transmission shaft;

9—the first connecting piece; 10—the sixth gear; 12—the torsion limiting damper; 13—the second connecting piece.

Detailed ways

All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and/or steps.

Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features. Throughout the specification, like reference numerals refer to like elements.

The technical solution of the present application will be described below in conjunction with the accompanying drawings and through specific implementation methods.

The engine is directly connected to the generator through the speed-increasing gear pair, that is, the engine and the generator are always connected, so that the generator cannot output driving force to the wheels of the car alone. If the generator is required to output driving force to the wheels of the car , since the engine and the generator are always in a connected state, while the generator rotates, the engine also needs to rotate together, resulting in a large loss of rotational energy and affecting the economy of the vehicle; and, when the engine directly drives the vehicle, due to The generator will also be in a state of continuous high speed at the same time to generate a large electromagnetic field, which will easily cause the generator to generate a large back EMF, thereby affecting the electronic control performance of the car's controller.

Embodiment one

In this regard, a dual-motor hybrid power system is proposed in this embodiment, as shown in FIG. piece 13. Wherein, the differential gear end 7 comprises a differential gear 71 and a differential gear 72 that are connected in transmission, and the differential gear 72 is connected with the wheel transmission of the automobile so as to drive the wheels to rotate through the differential gear 72; the power of the drive motor 1 can be passed through The first drive path is transmitted to the differential gear 71, thereby driving the wheels to rotate through the drive motor 1; the power of the engine 2 can be transmitted through the second drive path; the generator 3 can provide electric energy for the drive motor 1 on the one hand, and generate electricity on the other hand The power of the engine 3 can be transmitted through the third drive path, and a fourth drive path for power transmission is formed between the generator 3 and the engine 2; the first connecting member 9 is in transmission connection with the differential gear 71, and the first connecting member 9 is configured to control the power on and off between the generator 3 and the differential gear 71, and between the engine 2 and the differential gear 71; the first connecting member 9 has a first connection state and a first disconnection state, when When the first connecting piece 9 is in the first connection state, the first connecting piece 9 can be selectively connected to the second drive path or the third drive path; when the first connecting piece 9 is in the first disconnected state, the first connection The parts 9 are not connected to the second driving path and the third driving path; the second connecting part 13 is arranged on the fourth driving path, and the second connecting part 13 is configured to control the power on-off between the engine 2 and the generator 3; The second connector 13 has a second connection state and a second disconnection state. When the second connector 13 is in the second connection state, the engine 2 communicates with the generator 3. When the second connector 13 is in the second disconnection state , the engine 2 is disconnected from the generator 3.

Compared with the related art, the dual-motor hybrid power system in this embodiment has a second connecting piece 13 between the generator 3 and the engine 2, and a first connecting piece 9 configured to control the power on and off of the engine 2 and generator 3 power on and off; make the first connecting part 9 in the first connection state, the first connecting part 9 is connected to the third drive path, and the second connecting part 13 is in the second disconnected state, so that the generator 3 The driving force is transmitted to the differential gear 71 through the third drive path and the first connecting member 9 to drive the wheels. Turn on, so that the generator 3 and the engine 2 are completely decoupled, so that the generator 3 can output driving force to the wheels of the car alone. Since the generator 3 does not rotate together, the engine 2 does not rotate together, thereby avoiding Due to the loss of rotational energy caused by the rotation of the engine 2, the economy of the whole vehicle is improved; and the complete decoupling of the drive of the generator 3 and the engine 2 is realized by controlling the state of the first connecting member 9, so that when the engine 2 is driven, The generator 3 will not be in a state of continuous high speed, so it will not generate an electromagnetic field, which avoids the problem that the electric control performance of the controller of the car is affected due to the large back electromotive force generated by the generator 3 .

At the same time, it is also possible to make the first connecting member 9 in the first connection state and be connected to the third driving path, the second connecting member 13 is in the second disconnected state, and the driving force output by the driving motor 1 is transmitted to the differential through the first driving path. The transmission gear 71; the driving force of the generator 3 is transmitted to the differential gear 71 through the third drive path and the first connecting member 9, so as to jointly drive the wheels with the power transmitted to the drive motor 1, so that the drive motor 1 and power generation can be realized. Engine 3 also drives the wheels, which greatly improves the power of the car.

Since the power between the engine 2 and the generator 3 can be completely decoupled, the state of the engine 2, the generator 3, the drive motor 1, the first connecting part 9 and the second connecting part 13 can be controlled, thereby realizing the Power requirements and vehicle economy requirements.

The first connecting part 9 is a clutch or a synchronizer, and/or the second connecting part 13 is a clutch or a synchronizer. As shown in FIG. 1 , in this embodiment, the first connecting member 9 is a synchronizer, and the second connecting member 13 is a clutch. In other embodiments, the first connecting part 9 may also be a clutch, and the second connecting part 13 may be a synchronizer. Wherein, the clutch can be a wet clutch or an electromagnetic clutch.

As shown in Figure 1, the dual-motor hybrid power system also includes a first power transmission assembly 6, the first power transmission assembly 6 is arranged at the output end of the drive motor 1, and the first power transmission assembly 6 is configured to transfer the power of the drive motor 1 It is transmitted to the differential gear 71 along the first drive path to drive the wheels to rotate.

As shown in Figure 1, the first power transmission assembly 6 includes a first gear 61 and a second gear 62 meshing with each other, a first transmission shaft 63 and a third gear 64; wherein, the first gear 61 is fixedly sleeved on the drive motor 1 on the first output shaft 11; the first transmission shaft 63 is set parallel to the first output shaft 11, the second gear 62 is fixedly sleeved on the first transmission shaft 63; the third gear 64 is fixedly sleeved on the first transmission shaft 63 and spaced apart from the second gear 62, the third gear 64 is meshed with the differential gear 71 to drive the differential gear 71 and the differential 72 to rotate through the rotation of the third gear 64, thereby driving the drive motor 1 Drive power is transmitted to the wheels.

During the process of driving the wheels to rotate by the engine 2 , the drive motor 1 will rotate along with the differential gear 71 due to the meshing connection between the third gear 64 . During the process of driving the motor 1 to follow the rotation, the rotational energy will also be lost.

For this reason, in other embodiments, the dual-motor hybrid system further includes a third connecting piece, one end of the third connecting piece is fixedly connected to the differential gear 71 , and the other end of the third connecting piece is fixedly connected to the third gear 64 , the third link is configured to control the power on and off between the drive motor 1 and the differential gear 71; the third link has a third connection state and a third disconnection state, when the third link is in the third disconnection state In the open state, the third gear 64 is not connected to the differential gear 71 , and when the third connecting member is in the third connection state, the third gear 64 is in transmission connection with the differential gear 71 .

By arranging the third connecting piece, it can be realized that while the engine 2 drives the wheels to rotate, the drive motor 1 does not need to follow the rotation, so as to avoid the loss of rotational energy caused by the drive motor 1 following the rotation. The third link can be a clutch or a synchronizer.

As shown in FIG. 1 , the dual-motor hybrid power system further includes a second power transmission assembly 8, which is arranged at the output end of the engine 2, and the second power transmission assembly 8 is configured to transmit the power of the engine 2 along the first Two drive paths are passed.

As shown in Figure 1, the second power transmission assembly 8 includes a fourth gear 81, a fifth gear 82, and a second transmission shaft 83 that are meshed with each other; wherein, the fourth gear 81 is fixedly sleeved on the second output shaft of the engine 2 21; the second transmission shaft 83 is set parallel to the second output shaft 21 and the first transmission shaft 63 respectively, the fifth gear 82 is sleeved on the second transmission shaft 83 with clearance, and the first connecting member 9 is fixedly connected to the second On the transmission shaft 83, the first connecting member 9 can be selectively connected to the fifth gear 82, so as to realize the selective connection of the first connecting member 9 to the second drive path; A sixth gear 10 is provided, and the sixth gear 10 is meshed with the differential gear 71 to realize the transmission connection between the first connecting member 9 and the differential gear 71 .

As shown in FIG. 1 , the dual-motor hybrid power system further includes a third power transmission assembly 4 , the third power transmission assembly 4 is arranged at the output end of the generator 3 , and the third power transmission assembly 4 is configured to convert the power of the generator 3 The transfer is made along the third drive path.

As shown in FIG. 1 , the third power transmission assembly 4 includes a seventh gear 41 , an eighth gear 42 and a ninth gear 43 meshed in sequence, and the seventh gear 41 is fixedly sleeved on the third output shaft 31 of the generator 3 , the eighth gear 42 is sleeved on the second output shaft 21 with a gap, the ninth gear 43 is sleeved on the second transmission shaft 83 with a gap, and the first connecting member 9 can be selectively connected with the ninth gear 43 to realize The first connecting member 9 is selectively connected to the third driving path; and the third output shaft 31 is arranged parallel to the second output shaft 21 .

By arranging the first output shaft 11, the first transmission shaft 63, the second transmission shaft 83, the second output shaft 21 and the third output shaft 31 parallel to each other, it is possible to reduce the vertical friction of the entire dual-motor hybrid system. Size, so that the structure of the entire dual-motor hybrid system is relatively compact, saving its installation space in the car and making it more installable. Wherein, the second output shaft 21 is connected with a torsion-limiting shock absorber 12 to limit the torsion and vibration of the power output by the engine 2 .

The dual-motor hybrid system further includes a fourth power transmission assembly, which is arranged in the fourth drive path, and is configured to transmit the power of the engine 2 to the generator 3 so that the generator 3 Power generation is performed, or the power of the generator 3 is transmitted to the engine 2 to start the engine 2 .

As shown in Figure 1, the fourth power transmission assembly includes a tenth gear 51, the tenth gear 51 is sleeved on the third output shaft 31 with clearance, the tenth gear 51 and the fourth gear 81 are meshed with each other, and the second connecting member 13 is arranged on the third output shaft 31, one end of the second connecting member 13 is fixedly connected to the seventh gear 41, and the other end of the second connecting member 13 is fixedly connected to the tenth gear 51; when the second connecting member 13 is in the second In the disconnected state, there is no connection relationship between the seventh gear 41 and the tenth gear 51; Establish transmission connection relationship.

Embodiment two

In this embodiment, a control method based on the dual-motor hybrid system in Embodiment 1 is proposed, as shown in Table 1, where × in Table 1 represents a disconnected state, and √ represents a connected state.

Table 1

A control method for a dual-motor hybrid system includes the following steps:

Stop and start working mode: the first connecting part 9 is in the first disconnected state, the second connecting part 13 is in the second connected state, the driving motor 1 does not work, the generator 3 and the engine 2 work; the driving force of the generator 3 is passed through The fourth driving path is transmitted to the engine 2 to start the engine 2; idle power generation mode: the first connecting part 9 is in the first disconnected state, the second connecting part 13 is in the second connected state, the driving motor 1 does not work, and the power generation Engine 3 and engine 2 work; the driving force output by engine 2 is transmitted to generator 3 through the fourth drive path, so that generator 3 generates electricity; pure electric drive mode: engine 2 and generator 3 are not working, the first connection Part 9 is in the first disconnected state, and the driving motor 1 works; the driving force output by the driving motor 1 is transmitted to the differential gear 71 through the first driving path to drive the wheels; in the serial driving mode: the second connecting member 13 is in the first In the second connection state, the first connector 9 is in the first disconnected state, and the engine 2, the generator 3, and the driving motor 1 all work; the driving force output by the engine 2 is transmitted to the generator 3 through the fourth drive path, so that the generator 3 power generation; the electric energy of the generator 3 is provided to the driving motor 1, so that the driving motor 1 generates driving force, and the driving force generated by the driving motor 1 is transmitted to the differential gear 71 through the first driving path to drive the wheels; the engine is directly driven Working mode: the first connection part 9 is in the first connection state, and the first connection part 9 is connected to the second drive path, the second connection part 13 is in the second disconnection state, the generator 3 does not work, and the engine 2 works; the engine 2. The output driving force is transmitted to the differential gear 71 through the second drive path and the first connecting member 9, and the driving motor 1 rotates accordingly; the parallel driving mode of the engine and the driving motor: the first connecting member 9 is in the first connection state, And the first connector 9 is connected to the second drive path, the second connector 13 is in the second disconnected state, the generator 3 does not work, the drive motor 1 and the engine 2 work; the driving force output by the engine 2 passes through the second drive path and the first connecting piece 9 to the differential gear 71, the driving force output by the drive motor 1 is transmitted to the differential gear 71 through the first drive path, so as to jointly drive the wheels with the power transmitted to the engine 2; the drive motor and the power generator Machine parallel driving mode: the first connecting part 9 is in the first connection state, and the first connecting part 9 is connected to the third drive path, the second connecting part 13 is in the second disconnected state, the engine 2 does not work, and the drive motor 1 Work with the generator 3; the driving force output by the driving motor 1 is transmitted to the differential gear 71 through the first driving path; the driving force of the generator 3 is transmitted to the differential gear 71 through the third driving path and the first connecting member 9 , to drive the wheels together with the power transmitted by the drive motor 1; braking energy recovery mode: the first connecting member 9 is in the first disconnected state, the engine 2 and the generator 3 are not working, and the drive motor 1 is working; The driving force acts on the driving motor 1 through the first driving path, so that the driving motor 1 generates electricity.

By controlling the working states of the engine 2, the generator 3, and the drive motor 1, as well as controlling the states of the first connecting member 9 and the second connecting member 13, it is possible to form a stop-start working mode, an idling power generation working mode, and a pure electric drive working mode , series drive mode, engine direct drive mode, engine and drive motor parallel drive mode, drive motor and generator parallel drive mode, and braking energy recovery mode. The above-mentioned multiple working modes are switched and selected, thereby ensuring the power performance of the vehicle and the economy of the whole vehicle.

Embodiment three

A hybrid electric vehicle is proposed in this embodiment, and the automobile includes a controller, and the controller can control the operating mode of the hybrid electric vehicle according to the operating parameters of the hybrid electric vehicle and based on the control method of the dual-motor hybrid system in Embodiment 2. Make a selection.

The hybrid electric vehicle also includes an electric energy storage device, the electric energy storage device is configured to provide electric energy for the drive motor 1 and the generator 3, and the electric energy generated by the drive motor 1 and the generator 3 can be stored in the electric energy storage device, the work of the hybrid electric vehicle The parameters include at least the vehicle speed and acceleration requirements of the hybrid vehicle, the power of the electric energy storage device, the mileage of the hybrid vehicle, the braking state of the hybrid vehicle, and the stepping force on the pedals of the hybrid vehicle, so that the vehicle can operate under the operating parameters Choose the working mode that suits it, so that the economy and power of the whole vehicle can be guaranteed under this working mode. Among them, the working parameters of the car can be selected according to the working conditions of the car. In this embodiment, the electric energy storage device is a battery.

When the mileage of the hybrid vehicle is short, the current power of the power storage device is sufficient, and the acceleration demand of the vehicle is not high, the pure electric drive mode can be selected, and at the same time, the environmental protection effect of zero fuel consumption and zero emission can be achieved.

When the mileage of the hybrid vehicle is long and the current power of the power storage device is not sufficient, the current power of the power storage device is not enough to support the car to adopt the pure electric drive mode. At this time, the series drive mode is selected so that the engine 2 can It works in the best economic range of fuel and has good economy.

When the speed of the car is high and the speed is relatively stable, the engine direct drive mode can be selected to make the engine 2 work more efficiently and avoid poor economy caused by the drive motor 1 working in a high speed range for a long time The problem.

When the speed of the car is high and the acceleration demand of the vehicle is also high and the current power of the battery of the power storage device is sufficient, the parallel driving mode of the engine and the drive motor can be selected, and the drive motor 1 and the engine 2 are used as the power source to drive the vehicle at the same time. It can make the power performance of the hybrid electric vehicle better.

When the mileage of the hybrid vehicle is short, the current power of the power storage device is sufficient, and the acceleration demand of the vehicle is high, the parallel driving mode of the generator and the drive motor can be selected. Running at high speed causes poor economy of the whole vehicle, on the other hand, it can make the whole vehicle have strong power.

The working process of the parking and starting working mode in the present embodiment is as follows, that is, the car is in a stopped state at this time, and the car needs to be started, as shown in Figure 3:

First, make the first connecting member 9 be in the first disconnected state, the first connecting member 9 is neither connected with the fifth gear 82 nor connected with the ninth gear 43; make the second connecting member 13 be in the second connected state, At this time, a connection is established between the seventh gear 41 and the tenth gear 51; the driving motor 1 does not work, and the generator 3 and the engine 2 work; then, the driving force generated by the generator 3 passes through the third output shaft 31, the seventh The gear 41, the second connecting member 13, the tenth gear 51, and the fourth gear 81 are transmitted to the second output shaft 21, and the second output shaft 21 drives the engine 2 to run, so as to transmit the driving force of the generator 3 to the engine 2, so as to The hybrid electric vehicle can start the engine 2 through the generator 3 .

The working process of the idling power generation mode of operation in this embodiment is as follows, as shown in Figure 4:

First, make the first connecting member 9 be in the first disconnected state, the first connecting member 9 is neither connected with the fifth gear 82 nor connected with the ninth gear 43; make the second connecting member 13 be in the second connected state, At this time, a connection is established between the seventh gear 41 and the tenth gear 51; the driving motor 1 does not work, and the generator 3 and the engine 2 work; then, the driving force output by the engine 2 passes through the second output shaft 21 and the fourth gear 81 in sequence. , the tenth gear 51, the second connecting member 13, and the seventh gear 41 are transmitted to the third output shaft 31, and the third output shaft 31 drives the generator 3 to run, so as to transmit the driving force of the engine 2 to the generator 3, thereby The electric energy generated by the generator 3 is stored in the electric energy storage device for convenient use.

Because the automobile is in an idle state at this time, the power provided by the engine 2 required by the automobile is not large, and the excess driving force generated by the engine 2 can be transmitted to the generator 3 for power generation and storage, thereby realizing the maximum utilization of the resources of the engine 2, thereby making the automobile It has better vehicle economy.

The working process of the pure electric drive mode in this embodiment is as follows, as shown in Figure 5:

First, make the first connecting piece 9 in the first disconnected state, the first connecting piece 9 is neither connected with the fifth gear 82 nor connected with the ninth gear 43; the driving motor 1 works, the generator 3 and the engine 2 do not work; then, the driving force output by the driving motor 1 is transmitted to the differential gear 71 through the first output shaft 11, the first gear 61, the second gear 62, the first transmission shaft 63, and the third gear 64 in sequence, and the differential The gear 71 drives the differential gear 72 to run, and the differential gear 72 drives the wheels to rotate, so that the driving motor 1 drives the wheels to rotate independently.

Since the mileage of the car is relatively short at this time, and the current power in the electric energy storage device can support the drive motor 1 to drive the car alone, it does not need to use the engine 2 to drive, saving fuel, so that the car has better overall vehicle economy At the same time, because the drive motor 1 drives the wheels independently, pure electric drive is realized, and the environmental protection effect of zero fuel consumption and zero emission is achieved.

The working process of the series drive working mode in this embodiment is as follows, as shown in Figure 6:

First, make the first connecting member 9 be in the first disconnected state, the first connecting member 9 is neither connected with the fifth gear 82 nor connected with the ninth gear 43; make the second connecting member 13 be in the second connected state, At this time, a connection is established between the seventh gear 41 and the tenth gear 51; the driving motor 1, the generator 3 and the engine 2 all work; then, the driving force output by the engine 2 passes through the second output shaft 21, the fourth gear 81, The tenth gear 51, the second connecting member 13, and the seventh gear 41 are transmitted to the third output shaft 31, and the third output shaft 31 drives the generator 3 to run, so as to transmit the driving force of the engine 2 to the generator 3, thereby generating electricity generator 3 to generate electricity; finally, the electric energy generated by the generator 3 is provided to the driving motor 1 to provide electric energy for the driving motor 1, so that the driving motor 1 generates driving force, and the driving force generated by the driving motor 1 passes through the first output shaft 11, the second The first gear 61, the second gear 62, the first drive shaft 63, and the third gear 64 are transmitted to the differential gear 71, and the differential gear 71 drives the differential 72 to run, and the differential 72 drives the wheels to rotate, so that the engine 2. The generator 3 and the driving motor 1 are connected in series to drive the wheels to rotate.

Because the mileage of the car is relatively long at this time, and the current power in the electric energy storage device is not enough to support the drive motor 1 to generate driving force alone to meet the driving range of the car, at this time, it is necessary to start the engine 2 so that the engine 2 drives the generator 3 to generate electricity, so as to provide electric energy for driving the motor 1; at this time, the engine 2 only needs to drive the generator 3, and will not be affected by the wheel speed, so that the engine 2 can work in the best fuel economy range during the entire driving process In order to optimize the vehicle economy.

The working process of the engine direct drive working mode in this embodiment is as follows, as shown in Figure 7:

First, make the first connecting member 9 in the first connection state, and connect the first connecting member 9 with the fifth gear 82; make the second connecting member 13 in the second disconnected state, at this moment, the seventh gear 41 and the tenth gear 82 are connected. No connection is established between the gears 51; the generator 3 is not working, and the engine 2 is working; then, the driving force output by the engine 2 passes through the second output shaft 21, the fourth gear 81, the fifth gear 82, the first connecting member 9, The second transmission shaft 83 and the sixth gear 10 are transmitted to the differential gear 71, the differential gear 71 drives the differential 72 to run, and the differential 72 drives the wheels to rotate, so that the engine 2 drives the wheels to rotate independently.

Since the speed of the car is relatively high and stable at this time, if the drive motor 1 is used as the power source, the drive motor 1 will work in the high speed range for a long time and the economy of the whole vehicle will be poor. The engine 2 is adopted to directly output power to drive the vehicle.

During the rotation of the wheels driven by the engine 2, since the differential gear 71 and the third gear 64 are meshed and connected, the drive motor 1 will follow the rotation. loss of rotational energy. Therefore, at this time, the transmission connection between the third gear 64 and the differential gear 71 can be disconnected by controlling the third connecting member to be in the third disconnected state, so as to achieve driving while the engine 2 drives the wheels to rotate. The motor 1 does not follow the rotation, so as to avoid the loss of rotational energy caused by the drive motor 1 following the rotation.

The working process of the engine and the driving motor in parallel driving mode in this embodiment is as follows, as shown in Figure 8:

First, make the first connecting member 9 in the first connection state, and connect the first connecting member 9 with the fifth gear 82; make the second connecting member 13 in the second disconnected state, at this moment, the seventh gear 41 and the tenth gear 82 are connected. No connection is established between the gears 51; the generator 3 does not work, and the driving motor 1 and the engine 2 both work; then, the driving force output by the engine 2 passes through the second output shaft 21, the fourth gear 81, the fifth gear 82, the A connecting piece 9, the second transmission shaft 83, and the sixth gear 10 are transmitted to the differential gear 71, and the differential gear 71 drives the differential 72 to run; at the same time, the driving force generated by the driving motor 1 passes through the first output shaft in sequence 11. The first gear 61, the second gear 62, the first transmission shaft 63, and the third gear 64 are transmitted to the differential gear 71. The differential gear 71 drives the differential 72 to run, and the differential 72 drives the wheels to rotate. To realize that the engine 2 and the driving motor 1 are connected in parallel to drive the wheels to rotate.

Since the automobile is running at a higher speed and the driving force required by the automobile is larger, the driving motor 1 and the engine 2 are used as power sources to drive the vehicle at the same time, so that the power of the hybrid electric vehicle is better.

At this time, since the second connecting member 13 is in the second disconnected state, no connection is established between the seventh gear 41 and the tenth gear 51, therefore, the rotation of the engine 2 will not drive the generator 3 to rotate with it. On the one hand, it can To avoid the loss of rotational energy, on the other hand, it can avoid the problem of back electromotive force due to the high-speed rotation of the generator 3, so that the electronic control function of the controller can be better protected from damage.

The working process of the generator and the drive motor in parallel driving mode in this embodiment is as follows, as shown in Figure 9:

First, make the first connecting piece 9 in the first connection state, and connect the first connecting piece 9 with the ninth gear 43; make the second connecting piece 13 in the second disconnected state, at this time, the seventh gear 41 and the tenth gear No connection is established between the gears 51; the engine 2 does not work, and the driving motor 1 and the generator 3 all work; then, the driving force output by the driving motor 1 passes through the first output shaft 11, the first gear 61, the second gear 62, The first transmission shaft 63 and the third gear 64 are transmitted to the differential gear 71, the differential gear 71 drives the differential 72 to run, and the differential 72 drives the wheels to rotate; meanwhile, the driving force generated by the generator 3 passes through the first The three output shafts 31, the seventh gear 41, the eighth gear 42, the ninth gear 43, the first connecting piece 9, the second transmission shaft 83, and the sixth gear 10 are transmitted to the differential gear 71, and the differential gear 71 drives The differential 72 operates, and the differential 72 drives the wheels to rotate, so that the generator 3 and the driving motor 1 are connected in parallel to drive the wheels to rotate.

Since the car is in a low speed range and requires a relatively large driving force, but the driving force generated by the driving motor 1 alone is not enough to meet the driving needs of the car, the generator 3 and the driving motor 1 are used to drive the wheels in parallel. On the one hand, it can prevent the engine 2 from running under low-speed and heavy-load conditions, resulting in poor vehicle economy; on the other hand, the dual-motor drive of the generator 3 and the drive motor 1 can make the vehicle have strong power. And because the second connecting member 13 is in the second disconnected state, there is no connection between the seventh gear 41 and the tenth gear 51 at this time, and the engine 2 will not rotate with it, so as to avoid the loss of rotational energy; The motor 1 and the generator 3 drive the wheels, realizing pure electric drive and achieving the effect of zero fuel consumption and zero emission.

The working process of the braking energy recovery working mode in this embodiment is as follows, as shown in FIG. 10 :

First, make the first connecting piece 9 in the first disconnected state, the first connecting piece 9 is neither connected with the fifth gear 82 nor connected with the ninth gear 43; the driving motor 1 works, the generator 3 and the engine 2 do not work; then, the braking force of the wheel can be transmitted to the first output shaft 11 through the differential 72, the differential gear 71, the third gear 64, the first transmission shaft 63, the second gear 62, and the first gear 61 in sequence, The drive motor 1 is driven to generate electricity, so that the electric energy generated by the drive motor 1 is stored in the electric energy storage device for easy use.

Since the car is in the braking state at this time, the braking energy generated by the wheels can be recovered and converted into electric energy for storage through the braking energy recovery working mode, which realizes the recovery of braking energy, saves the energy consumption of the whole vehicle, and realizes Maximize the use of resources.

Due to the working mode of stopping and starting, the working mode of idling power generation, the working mode of pure electric drive, the working mode of series driving, the working mode of direct drive of the engine, the working mode of parallel driving of the engine and the driving motor, the working mode of parallel driving of the driving motor and the generator and the system Dynamic energy recovery working mode Various working modes, so that the hybrid electric vehicle can select and switch the working mode according to different working conditions, so as to realize the vehicle economy and power of the hybrid electric vehicle, and maximize the resources utilization.

Claims (15)

1. A two-motor hybrid system comprising:

   The differential end (7) includes a differential gear (71) and a differential (72) connected by transmission, and the differential (72) is connected with the wheel transmission of the automobile;

   a drive motor (1), the power of the drive motor (1) is transmitted to the differential gear (71) through a first drive path;

   an engine (2), the power of the engine (2) is transmitted through the second drive path;

   A generator (3), the generator (3) is configured to provide electrical energy for the drive motor (1), and the power of the generator (3) is transmitted through a third drive path, the generator (3) ) and the engine (2) form a fourth drive path for power transmission;

   The first connecting piece (9) is in driving connection with the differential gear (71), the first connecting piece (9) has a first connected state and a first disconnected state, and the first connecting piece ( 9) In the case of the first connection state, the first connecting part (9) is configured to be selectively connected to the second driving path or the third driving path, and the first connecting part (9) In the case of the first disconnected state, the first connecting member (9) does not connect the second driving path and the third driving path;

   The second connecting piece (13) is arranged on the fourth driving path, the second connecting piece (13) has a second connected state and a second disconnected state, and when the second connecting piece (13) is in In the case of the second connection state, the engine (2) communicates with the generator (3), and in the case of the second connection member (13) in the second disconnection state, the The engine (2) is disconnected from said generator (3).
2. The dual-motor hybrid power system according to claim 1, which satisfies at least one of the following:

   The first connecting member (9) is a clutch or a synchronizer; or

   The second connecting piece (13) is a clutch or a synchronizer.
3. The dual-motor hybrid system according to claim 1, further comprising:

   The first power transmission assembly (6) is arranged at the output end of the driving motor (1), and the first power transmission assembly (6) is configured to transmit the power of the driving motor (1) along the first The drive path is transmitted to the differential gear (71).
4. The dual-motor hybrid power system according to claim 3, wherein the first power transmission assembly (6) comprises:

   A first gear (61) and a second gear (62) meshed with each other, the first gear (61) is fixedly sleeved to the first output shaft (11) of the drive motor (1);

   The first transmission shaft (63) is arranged parallel to the first output shaft (11), and the second gear (62) is fixedly sleeved to the first transmission shaft (63);

   The third gear (64), fixedly sleeved to the first transmission shaft (63) and spaced from the second gear (62), the third gear (64) and the differential gear (71 ) mesh connection.
5. The dual-motor hybrid system according to claim 4, further comprising:

   A third connecting piece, one end of the third connecting piece is fixedly connected to the differential gear (71), the other end of the third connecting piece is fixedly connected to the third gear (64), the first The three connecting parts are configured to control the on-off of power between the drive motor (1) and the differential gear (71); the third connecting part has a third connection state and a third disconnection state, in When the third connecting member is in the third disconnected state, the third gear (64) is not connected to the differential gear (71), and when the third connecting member is in the first In the case of the three-connection state, the third gear (64) is in transmission connection with the differential gear (71).
6. The dual-motor hybrid power system according to claim 5, wherein the third connecting member is a clutch or a synchronizer.
7. The dual-motor hybrid system according to claim 4, further comprising:

   The second power transmission assembly (8) is arranged at the output end of the engine (2), and the second power transmission assembly (8) is configured to transmit the power of the engine (2) along the second drive path transfer.
8. The dual-motor hybrid power system according to claim 7, wherein the second power transmission assembly (8) comprises:

   A fourth gear (81) and a fifth gear (82) meshed with each other, the fourth gear (81) is fixedly sleeved to the second output shaft (21) of the engine (2);

   The second transmission shaft (83) is arranged in parallel with the second output shaft (21) and the first transmission shaft (63), and the fifth gear (82) is sleeved to the second transmission shaft ( 83), and the first connecting piece (9) is fixedly connected to the second transmission shaft (83), and the first connecting piece (9) is configured to selectively connect with the fifth gear (82 ) transmission connection, the second transmission shaft (83) is also fixedly sleeved with a sixth gear (10), and the sixth gear (10) is meshed with the differential gear (71).
9. The dual-motor hybrid system according to claim 8, further comprising:

   The third power transmission assembly (4) is arranged at the output end of the generator (3), and the third power transmission assembly (4) is configured to transmit the power of the generator (3) along the third Drive path transfer.
10. The dual-motor hybrid power system according to claim 9, wherein the third power transmission assembly (4) comprises:

    The seventh gear (41), the eighth gear (42) and the ninth gear (43) meshed in sequence, and the seventh gear (41) is fixedly sleeved to the third output shaft ( 31), the eighth gear (42) is sleeved on the second output shaft (21) with gaps, and the ninth gear (43) is sleeved on the second transmission shaft (83) with gaps, The first connecting member (9) is configured to be selectively connected in transmission with the ninth gear (43), and the third output shaft (31) is arranged in parallel with the second output shaft (21).
11. The dual-motor hybrid system according to claim 10, wherein the dual-motor hybrid system further comprises:

    a fourth power transmission assembly arranged in the fourth drive path, the fourth power transmission assembly is configured to transmit the power of the engine (2) to the generator (3), or to transmit the power of the power generator (3) The power of the engine (3) is transmitted to the engine (2).
12. The two-motor hybrid powertrain system of claim 11, wherein the fourth power transmission assembly comprises:

    a tenth gear (51), the tenth gear (51) is sheathed on the third output shaft (31) with gaps, the tenth gear (51) is meshed with the fourth gear (81), And the second connecting piece (13) is arranged on the third output shaft (31), one end of the second connecting piece (13) is fixedly connected with the seventh gear (41), the second The other end of the connecting piece (13) is fixedly connected to the tenth gear (51); when the second connecting piece (13) is in the second disconnected state, the seventh gear (41) Not connected with the tenth gear (51), when the second connecting member (13) is in the second connection state, the seventh gear (41) and the tenth gear (51) Drive connection.
13. A control method based on the dual-motor hybrid system according to any one of claims 1-12, comprising:

    Stop and start working mode: the first connecting part (9) is in the first disconnected state, the second connecting part (13) is in the second connected state, and the driving motor (1) does not work , the generator (3) and the engine (2) work; the driving force of the generator (3) is transmitted to the engine (2) through the fourth drive path, so that the engine (2) )start up;

    Idle power generation working mode: the first connecting piece (9) is in the first disconnected state, the second connecting piece (13) is in the second connected state, the drive motor (1) is not working, The generator (3) and the engine (2) work; the driving force output by the engine (2) is transmitted to the generator (3) through the fourth drive path, so that the generator ( 3) Power generation;

    Pure electric drive working mode: neither the engine (2) nor the generator (3) works, the first connector (9) is in the first disconnected state, and the drive motor (1) works ; The drive force output by the drive motor (1) is transmitted to the differential gear (71) through the first drive path to drive the wheels;

    Series drive working mode: the second connection part (13) is in the second connection state, the first connection part (9) is in the first disconnection state, the engine (2), the generator Engine (3) and the drive motor (1) are both working; the drive force output by the engine (2) is transmitted to the generator (3) through the fourth drive path, so that the generator (3) ) to generate electricity; the electric energy of the generator (3) is provided to the driving motor (1), so that the driving motor (1) generates driving force, and the driving force generated by the driving motor (1) is passed through the first a drive path is transmitted to said differential gear (71) to drive said wheels;

    Engine direct drive working mode: the first connecting part (9) is in the first connecting state, and the first connecting part (9) is connected to the second driving path, and the second connecting part (13 ) is in the second disconnected state, the generator (3) does not work, and the engine (2) works; the driving force output by the engine (2) passes through the second drive path and the first The connecting piece (9) is transmitted to the differential gear (71), and the drive motor (1) rotates accordingly;

    Parallel driving mode of the engine and the driving motor: the first connecting piece (9) is in the first connecting state, and the first connecting piece (9) is connected to the second driving path, and the second connecting piece (9) is connected to the second driving path. The component (13) is in the second disconnected state, the generator (3) does not work, the driving motor (1) and the engine (2) work; the driving force output by the engine (2) is The second driving path and the first connecting member (9) are transmitted to the differential gear (71), and the driving force output by the driving motor (1) is transmitted to the a differential gear (71) to drive the wheels together with the power transmitted from the engine (2);

    Drive motor (1) and generator (3) in parallel driving mode: the first connection part (9) is in the first connection state, and the first connection part (9) is connected to the third drive path, the second connecting member (13) is in the second disconnected state, the engine (2) does not work, the drive motor (1) and the generator (3) work; the drive motor (1) The output driving force is transmitted to the differential gear (71) through the first driving path; the driving force of the generator (3) is transmitted through the third driving path and the first connecting member (9) transmitted to the differential gear (71) to jointly drive the wheels with the power transmitted by the drive motor (1);

    Braking energy recovery working mode: the first connecting member (9) is in the first disconnected state, neither the engine (2) nor the generator (3) is working, and the drive motor (1) Work: the driving force of the wheel acts on the driving motor (1) through the first driving path, so that the driving motor (1) generates electricity.
14. A hybrid electric vehicle, comprising a controller configured to control the operating mode of the hybrid electric vehicle according to the operating parameters of the hybrid electric vehicle and based on the control method of the dual-motor hybrid system according to claim 13 Make a selection.
15. The hybrid vehicle according to claim 14, further comprising an electric energy storage device configured to provide electric energy for the drive motor (1) and the generator (3), and the drive motor ( 1) and the electric energy generated by the generator (3) is stored in the electric energy storage device, and the operating parameters of the hybrid electric vehicle include at least the vehicle speed and acceleration demand of the hybrid electric vehicle, and the electric energy of the electric energy storage device , the driving mileage of the hybrid vehicle, the braking state of the hybrid vehicle, and the stepping force on the pedals of the hybrid vehicle.

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