CN106585362A - Dynamic coupling system of hybrid electric vehicle and control method of dynamic coupling system - Google Patents

Abstract

The invention provides a hybrid electric vehicle power coupling system and a control method thereof, wherein the power coupling system includes: an engine (10); a generator (11), coaxially connected with the engine (10); a clutch (20) , set between the engine (10) and the generator (11); the driving motor (12) is respectively connected to the clutch (20) and the differential (30) through a transmission; the transmission It includes a synchronizer (70), a first gear (71) and a second gear (72) all arranged on the output shaft (120) of the drive motor, and the synchronizer (70) is used to control the first The first gear (71) or the second gear (72) is synchronously combined with or separated from the drive motor output shaft (120). The invention can effectively improve the power and economy of the hybrid electric vehicle.

Description

A hybrid electric vehicle power coupling system and control method thereof

technical field

The invention relates to the field of new energy vehicles, in particular to a hybrid vehicle power coupling system and a control method thereof.

Background technique

With the lack of oil resources, the improvement of people's awareness of environmental protection, and the requirements of increasingly stringent environmental protection regulations, there is an urgent need for green and environmentally friendly automotive products that can save energy and have low emissions or even zero emissions. To this end, governments around the world and major automobile manufacturers are intensifying their efforts to develop various types of new energy vehicles. A hybrid vehicle refers to a vehicle that uses more than two sources of energy compared to a conventional internal combustion engine.

The most common hybrid electric vehicle (HEV for short) has an engine and an electric motor. The engine consumes fuel, and the traction motor consumes electric energy from the power battery. In recent years, the power drive system and its working mode for hybrid electric vehicles have become a research hotspot.

Since the hybrid system involves traditional engine drive and electric motor drive, the structure is often more complex and takes up a lot of space, which affects the layout of other vehicle components. On the one hand, in the current mainstream motor parallel hybrid system, the motor generally adopts a disc structure and is installed between the engine and the transmission, occupying a certain axial dimension, resulting in a large axial length of the powertrain. Difficult to arrange. Due to size constraints, the power of the motor is generally not large, and the power performance under pure electric power is poor. On the other hand, the current hybrid transmission integrated motor scheme generally adopts a one-speed gear structure, and generally rarely adopts a multi-speed gear structure. It is often difficult to obtain satisfactory power and economy.

Contents of the invention

The technical problem to be solved by the present invention is to provide a hybrid electric vehicle power coupling system and a control method thereof that can improve power and economy.

In order to solve the above-mentioned technical problems, the present invention provides a hybrid electric vehicle power coupling system, comprising:

engine;

a generator coaxially connected to the engine;

a clutch disposed between the engine and the generator;

The driving motor is respectively connected with the clutch and the differential through a transmission device;

The transmission device includes a synchronizer, a first gear and a second gear all arranged on the output shaft of the drive motor, and the synchronizer is used to control the first gear or the second gear Combine or separate synchronously with the output shaft of the driving motor.

Wherein, the transmission device also includes:

the first gear, the second gear, the third gear, the fourth gear, the fifth gear and the intermediate shaft;

the first gear is connected to the driven portion of the clutch;

The second gear, the third gear and the fourth gear are all arranged on the intermediate shaft, and the second gear meshes with the first gear and the second gear gear respectively, so The third gear meshes with the first gear gear;

The fifth gear is arranged on the drive shaft, the fifth gear is meshed with the fourth gear and connected with the differential.

Wherein, different transmission ratios are formed between the first gear and the third gear, and between the second gear and the second gear.

Wherein, the synchronizer is arranged between the first gear and the second gear.

Wherein, the hybrid electric vehicle power coupling system also includes:

The shock absorber is arranged between the engine and the clutch, the input end of the shock absorber is connected with the engine, and the output end of the shock absorber is connected with the active part of the clutch.

The present invention also provides a control method for a power coupling system of a hybrid electric vehicle, comprising:

Step 21, judging the magnitude relationship between the battery SOC value and the first threshold value, or simultaneously judging the magnitude relationship between the battery SOC value and the first threshold value and the magnitude relationship between the vehicle speed and the second threshold value;

Step S22, switch the working mode of the power coupling system of the electric vehicle according to the judgment result, and in the working mode, control the synchronizer to synchronously combine the first gear or the second gear with the output shaft of the drive motor, The power of the drive motor is output through the first gear or the second gear.

Wherein, when the step S21 judges that the battery SOC value is higher than the first threshold, the step S22 includes:

Control the engine and generator to not work, disconnect the clutch, the power of the driving motor is output to the transmission device through the first gear or the second gear, and then transmitted to the differential switch, the power coupling system of the hybrid electric vehicle enters the pure electric mode.

Wherein, when the step S21 judges that the battery SOC value is lower than the first threshold and the vehicle speed is lower than the second threshold, the step S22 includes:

The clutch is controlled to be disconnected, the engine drives the generator to generate electricity to charge the battery or supply power to the drive motor, and the power of the drive motor is output to the After transmission, it is transmitted to the differential, and the power coupling system of the hybrid electric vehicle enters the range-extending mode.

Wherein, when the step S21 judges that the battery SOC value is lower than the first threshold and the vehicle speed is higher than the second threshold, the step S22 includes:

Control the engagement of the clutch, and the power of the drive motor is output through the first gear or the second gear, coupled with a part of the power of the engine and then transmitted to the differential; another part of the power of the engine Drive the generator to generate electricity to charge the battery or supply power to the driving motor, and the power coupling system of the hybrid electric vehicle enters a hybrid driving mode.

Wherein, the control method also includes:

When braking, the driving motor is controlled to generate braking torque, and an induced current is generated in the winding to charge the battery.

In the hybrid electric vehicle power coupling system and its control method according to the embodiment of the present invention, two gear gears are arranged on the output shaft of the driving motor, and are controlled by a synchronizer to synchronously combine or separate from the output shaft of the driving motor, so that the gears of the driving motor The power can be output through two output routes, providing two gears, which effectively improves the power and economy.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a hybrid electric vehicle power coupling system according to an embodiment of the present invention.

FIG. 2 is a schematic flowchart of a control method of a power coupling system of a hybrid electric vehicle according to Embodiment 2 of the present invention.

Fig. 3 is a schematic diagram of a hybrid electric vehicle power coupling system working in pure electric mode according to an embodiment of the present invention.

Fig. 4 is another schematic diagram of the hybrid electric vehicle power coupling system working in pure electric mode according to the embodiment of the present invention.

Fig. 5 is a schematic diagram of the hybrid electric vehicle power coupling system working in the range-extending mode according to the embodiment of the present invention.

Fig. 6 is another schematic diagram of the hybrid electric vehicle power coupling system working in the range-extending mode according to the embodiment of the present invention.

Fig. 7 is a schematic diagram of a power coupling system of a hybrid electric vehicle working in a hybrid mode according to an embodiment of the present invention.

Fig. 8 is another schematic diagram of the hybrid electric vehicle power coupling system working in the hybrid driving mode according to the embodiment of the present invention.

detailed description

The following descriptions of various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented. The terms of direction and position mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom" ", "side", etc., are only referring to the direction or position of the drawings. Therefore, the terms used in direction and position are used to explain and understand the present invention, but not to limit the protection scope of the present invention.

Please refer to Fig. 1, Embodiment 1 of the present invention provides a hybrid electric vehicle power coupling system, including:

engine 10;

The generator 11 is coaxially connected with the engine 10;

The clutch 20 is arranged between the engine 10 and the generator 11;

The drive motor 12 is connected to the clutch 20 and the differential 30 respectively through a transmission device;

The transmission device includes a synchronizer 70, a first gear gear 71 and a second gear gear 72 all arranged on the drive motor output shaft 120, and the synchronizer 70 is used to control the first gear gear 71 or the second gear gear 72 Combine or separate synchronously with the output shaft 120 of the driving motor.

The clutch 20 includes a driving part and a driven part that cooperate with each other, and the driving part of the clutch 20 is fixed to the output shaft 100 of the engine 10 .

In this embodiment, the transmission device also includes:

The first gear 21, the second gear 22, the third gear 23, the fourth gear 24, the fifth gear 25 and the intermediate shaft 210;

The first gear 21 is connected with the driven part of the clutch 20;

The second gear 22, the third gear 23 and the fourth gear 24 are all arranged on the intermediate shaft 210, the second gear 22 meshes with the first gear 21 and the second gear gear 72 respectively, and the third gear 23 meshes with the first gear Bit gear 71 is meshed;

The fifth gear 25 is disposed on the drive shaft 50 , and the fifth gear 25 meshes with the fourth gear 24 and is connected with the differential 30 .

The synchronizer 70 is disposed between the first speed gear 71 and the second speed gear 72 .

In the embodiment of the present invention, two gears are arranged on the output shaft 120 of the drive motor 12, and are controlled by the synchronizer 70 to synchronously combine or separate from the output shaft 120. Specifically, the first gear 71 and the third Different transmission ratios are formed between the gears 23, and between the second gear gear 72 and the second gear 22, so that the power of the drive motor 12 can be output via two output routes, providing two gears, effectively improving the Power and economy.

In addition, in this embodiment, the engine 10 is coaxially connected with the generator 11 , so the structure is more compact, and because an additional transmission device between the two is omitted, the transmission efficiency is higher. Accordingly, the output shaft 100 of the engine 10 shown in FIG. 1 and the motor shaft 110 of the generator 11 are coaxial.

In order to buffer and damp the output of the engine 10, the present embodiment also includes a shock absorber 40, which is arranged between the engine 10 and the clutch 20, the input end of the shock absorber 40 is connected with the engine 10, and the output of the shock absorber 40 The end is connected with the driving part of the clutch 20. Specifically, the shock absorber 10 may be a torsional shock absorber or a hydraulic coupling.

The differential 30 is connected to the drive wheels 60 through the drive shaft 50 .

In this embodiment, as another implementation, the clutch 20 is a dual clutch, which includes a first clutch and a second clutch, the driven part of the first clutch is connected with the generator 11, and the driven part of the second clutch Connected to the transmission.

The electric vehicle power coupling system with the above structure has a reasonable layout of components and a compact structure, which is convenient for assembly and saves space, and improves the utilization rate of the space in the vehicle.

The power coupling system of the embodiment of the present invention has a pure electric mode, an extended range mode and a hybrid drive mode, and can automatically switch between the three modes according to the battery SOC value and the vehicle speed requirement. Therefore, the second embodiment of the present invention provides a The control method of the hybrid electric vehicle power coupling system described in the first embodiment of the invention, please refer to FIG. 2, including:

Step 21, judging the magnitude relationship between the battery SOC value and the first threshold value, or simultaneously judging the magnitude relationship between the battery SOC value and the first threshold value and the magnitude relationship between the vehicle speed and the second threshold value;

Step S22, switch the working mode of the power coupling system of the electric vehicle according to the judgment result, and in the working mode, control the synchronizer to synchronously combine the first gear or the second gear with the output shaft of the drive motor, The power of the drive motor is output through the first gear or the second gear.

Specifically, as shown in FIG. 3 and FIG. 4 respectively, when step S21 determines that the battery SOC value is higher than the first threshold, step S22 includes: controlling the engine 10 and the generator 11 to not work, disconnecting the clutch 20, and the synchronizer 70 Let the first gear gear 71 or the second gear gear 72 be synchronously combined with the drive motor output shaft 120 (if the first gear gear 71 is combined with the drive motor output shaft 120 synchronously, then the second gear gear 72 and the drive motor output The shaft 120 is in a separated state; if the second gear gear 72 is synchronously combined with the drive motor output shaft 120, then the first gear gear 71 is in a separate state with the drive motor output shaft 120), and the power of the drive motor 12 passes through the first gear Gear 71 to the third gear 23 (Fig. 3) or the second gear 72 to the second gear 22 (Fig. 4), and then through the fourth gear 24 and the fifth gear 25 two-stage deceleration and then transmitted to the differential 30. The power is transmitted to the driving wheels 60 through the differential 30. At this time, the vehicle is running in a low-speed region in pure electric mode, and the power transmission routes are shown by the arrows in Fig. 3 and Fig. 4 respectively.

As shown in Fig. 5 and Fig. 6 respectively, when step S21 judges that the battery SOC value is lower than the first threshold and the vehicle speed is lower than the second threshold, step S22 includes: controlling to disconnect the clutch 20, the engine 10 drives the generator 11 to generate electricity, To charge the battery or supply power to the drive motor 12, the synchronizer 70 allows the first gear gear 71 or the second gear gear 72 to be synchronously combined with the drive motor output shaft 120 (if the first gear gear 71 is connected to the drive motor output shaft 120 Synchronously combined, then the second gear gear 72 is separated from the drive motor output shaft 120; if the second gear gear 72 is synchronously combined with the drive motor output shaft 120, then the first gear gear 71 and the drive motor output shaft 120 are separated state), the power of the driving motor 12 passes through the first gear 71 to the third gear 23 (Figure 5) or through the second gear 72 to the second gear 22 (Figure 6), and then passes through the fourth gear 24 1. The fifth gear 25 is transmitted to the differential 30 after two-stage deceleration, and the power is transmitted to the drive wheel 60 through the differential 30. At this time, the vehicle runs in the range-extending mode, and the power transmission routes are respectively shown in Fig. 5 and arrows in Fig. 6 shown.

As shown in Fig. 7 and Fig. 8 respectively, when step S21 determines that the battery SOC value is lower than the first threshold and the vehicle speed is higher than the second threshold, step S22 includes: controlling the clutch 20 to engage, and a part of the power of the engine 10 passes through the first gear 21. The second gear 22 to the intermediate shaft 210; the synchronizer 70 allows the first gear 71 or the second gear 72 to be synchronously combined with the drive motor output shaft 120 (if the first gear 71 and the drive motor output shaft 120 Synchronously combined, then the second gear gear 72 is separated from the drive motor output shaft 120; if the second gear gear 72 is synchronously combined with the drive motor output shaft 120, then the first gear gear 71 and the drive motor output shaft 120 are separated state), the power of the drive motor 12 passes through the first gear 71 to the third gear 23 ( FIG. 7 ) or through the second gear 72 to the second gear 22 ( FIG. 8 ), and a part of the power of the aforementioned engine 10 Coupled, and then passed to the differential 30 after the fourth gear 24 and the fifth gear 25 are decelerated in two stages, and the power is transmitted to the drive wheel 60 through the differential 30; another part of the power of the engine 10 drives the generator 11 to generate electricity to Charging the battery or supplying power to the driving motor 12, the vehicle is running in a hybrid driving mode, and the power transmission routes are shown by the arrows in Fig. 7 and Fig. 8 respectively.

In the above range-extending mode, due to the low SOC value of the battery, the generator 11 is used as a starter motor to start the engine 10, so that the engine 10 drives the generator 11 to charge the battery or supply power to the drive motor 12; At this time, the generator 11 will also be used as a starter motor to start the engine 10, the engine 10 will output the drive torque, and the drive motor 12 will assist the drive to enter the hybrid drive mode.

The above three modes are represented in a table as follows:

The first threshold is used to determine the level of the battery SOC value, and the second threshold is used to determine the level of the vehicle speed. This embodiment does not limit the value ranges of the first threshold and the second threshold, which can usually be set freely according to specific control strategies , under different control strategies, the values of the first threshold and the second threshold are different. After the first threshold and the second threshold are set, it is automatically judged and automatically switched among the three modes according to the judgment result.

In addition, when the car brakes, the driving motor 12 generates braking torque to brake the wheels, and at the same time, an induced current will be generated in the motor winding to charge the battery to realize the recovery of braking energy. Therefore, the control method of the present embodiment also includes:

When braking, the driving motor is controlled to generate braking torque, and an induced current is generated in the winding to charge the battery.

The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (10)

1. a kind of hybrid electric vehicle power coupled system, it is characterised in that include：

Electromotor（10）；

Electromotor（11）, with the electromotor（10）It is coaxial to be connected；

Clutch（20）, it is arranged on the electromotor（10）With the electromotor（11）Between；

Motor（12）, by actuating device respectively with the clutch（20）And differential mechanism（30）It is connected；

The actuating device includes may be contained within driving motor output shaft（120）On lock unit（70）, the first shifting gear（71）With the second shifting gear（72）, the lock unit（70）For controlling first shifting gear（71）Or second shifting gear（72）With the driving motor output shaft（120）It is synchronous to combine or separate.

2. hybrid electric vehicle power coupled system according to claim 1, it is characterised in that the actuating device also includes：

First gear（21）, second gear（22）, the 3rd gear（23）, the 4th gear（24）, the 5th gear（25）And jackshaft（210）；

The first gear（21）With the clutch（20）Secondary part be connected；

The second gear（22）, the 3rd gear（23）With the 4th gear（24）It is arranged at the jackshaft（210）On, the second gear（22）Respectively with the first gear（21）With second shifting gear（72）It is meshed, the 3rd gear（23）With first shifting gear（71）It is meshed；

5th gear（25）It is arranged on drive shaft（50）On, the 5th gear（25）With the 4th gear（24）Be meshed and with the differential mechanism（30）It is connected.

3. hybrid electric vehicle power coupled system according to claim 2, it is characterised in that first shifting gear（71）With the 3rd gear（23）Between, and second shifting gear（72）With the second gear（22）Between form different gear ratios respectively.

4. hybrid electric vehicle power coupled system according to claim 1, it is characterised in that the lock unit（70）It is arranged on first shifting gear（71）With second shifting gear（72）Between.

5. hybrid electric vehicle power coupled system according to claim 1, it is characterised in that the hybrid electric vehicle power coupled system also includes：

Vibroshock（40）, it is arranged on the electromotor（10）With the clutch（20）Between, the vibroshock（40）Input and the electromotor（10）It is connected, the vibroshock（40）Outfan and the clutch（20）Active part be connected.

6. a kind of control method of the hybrid electric vehicle power coupled system as described in any one of claim 1-5, including：

Step 21, judges the magnitude relationship of SOC value of battery and first threshold, or while judges SOC value of battery with the magnitude relationship and speed of first threshold and the magnitude relationship of Second Threshold；

Step S22, according to judged result, switch the mode of operation of the electric powered motor coupled system, and under the mode of operation, control lock unit makes the first shifting gear or the combination synchronous with driving motor output shaft of the second shifting gear, the power for making motor export via the first shifting gear or the second shifting gear.

7. control method according to claim 6, it is characterised in that when it is higher than first threshold that step S21 judges SOC value of battery, step S22 includes：

Control the electromotor, electromotor not work, disconnect the clutch, after the power of the motor is exported to the actuating device via the first shifting gear or the second shifting gear, then the differential mechanism is passed to, the hybrid electric vehicle power coupled system enters electric-only mode.

8. control method according to claim 6, it is characterised in that when step S21 judges SOC value of battery less than first threshold and speed is less than Second Threshold, step S22 includes：

Control disconnects the clutch, electrical power generators described in the driven by engine to battery charging or power to the motor, the power of the motor is exported to after the actuating device via the first shifting gear or the second shifting gear, the differential mechanism is passed to again, and the hybrid electric vehicle power coupled system is entered and increases journey pattern.

9. control method according to claim 6, it is characterised in that when step S21 judges SOC value of battery less than first threshold and speed is higher than Second Threshold, step S22 includes：

Control the clutch to combine, the power of the motor is exported via the first shifting gear or the second shifting gear, after coupling with a power part for the electromotor the differential mechanism is passed to；Another part power of the electromotor drives the electrical power generators to charge to battery or power to the motor, and the hybrid electric vehicle power coupled system enters combination drive pattern.

10. control method according to claim 6, it is characterised in that the control method also includes：

The motor is controlled in braking and produces braking moment, and produce faradic current in the windings to charge to battery.