阅读说明：本技术 一种车辆及其动力输出控制方法 (Vehicle and power output control method thereof ) 是由 康飞 杨怡 于 2020-03-31 设计创作，主要内容包括：本发明提供了一种车辆及其动力输出控制方法,车辆包括动力系统、传动系统和车轮系统；车辆处于驱动状态时,传动系统的主动齿轮与从动齿轮的啮合面分别为第一驱动啮合面和第二驱动啮合面,所述主动齿轮与所述从动齿轮的非啮合面分别为第一制动啮合面和第二制动啮合面；动力输出控制方法包括：获取车辆所受的行驶阻力；获取动力系统通过传动系统与车轮系统传动连接的传动阻力；根据行驶阻力和传动阻力,确定车辆的惰行扭矩；当车辆从驱动状态进入惰行状态时,控制动力系统输出惰行扭矩,使得第一制动啮合面和第二制动啮合面处于分离状态。本发明提供的动力输出控制方法通过控制车辆的动力系统输出的扭矩,实现对传动系统的碰撞异响的减缓。(The invention provides a vehicle and a power output control method thereof, wherein the vehicle comprises a power system, a transmission system and a wheel system; when the vehicle is in a driving state, meshing surfaces of a driving gear and a driven gear of a transmission system are respectively a first driving meshing surface and a second driving meshing surface, and non-meshing surfaces of the driving gear and the driven gear are respectively a first braking meshing surface and a second braking meshing surface; the power output control method includes: acquiring running resistance borne by a vehicle; acquiring transmission resistance of a power system in transmission connection with a wheel system through a transmission system; determining the coasting torque of the vehicle according to the driving resistance and the transmission resistance; when the vehicle enters the coasting state from the driving state, the power system is controlled to output the coasting torque such that the first brake engagement surface and the second brake engagement surface are in the disengaged state. The power output control method provided by the invention realizes the reduction of the collision abnormal sound of the transmission system by controlling the torque output by the power system of the vehicle.)

1. A power output control method of a vehicle is characterized in that the vehicle comprises a power system, a transmission system and a wheel system, the power system is in transmission connection with the wheel system through the transmission system, the transmission system comprises at least one stage of transmission gear set, and each stage of transmission gear set comprises a driving gear and a driven gear; when the vehicle is in a driving state, meshing surfaces of the driving gear and the driven gear are respectively a first driving meshing surface and a second driving meshing surface, and non-meshing surfaces of the driving gear and the driven gear are respectively a first braking meshing surface and a second braking meshing surface;

the power output control method includes:

acquiring running resistance borne by a vehicle;

acquiring transmission resistance of the power system in transmission connection with the wheel system through the transmission system;

determining the coasting torque of the vehicle from the driving resistance and the transmission resistanceT ₁；

When the vehicle enters the coasting state from the driving state, controlling the power system to output the coasting torqueT ₁Such that the first brake engagement surface and the second brake engagement surface are in a disengaged condition.

2. A power output control method of a vehicle according to claim 1, characterized by further comprising:

when the vehicle enters a driving state from a coasting state, the target driving torque required to be output by the power system is acquiredT ₂；

If the first drive engagement surface and the second drive engagement surface are in a disengaged state, sequentially performing the following steps:

controlling the powertrain to increase the output drive torque at a first loading rate;

controlling the powertrain to increase the output drive torque at a second loading rate; wherein the first loading rate is less than the second loading rate;

controlling the powertrain system to output the target drive torqueT ₂。

3. A power output control method of a vehicle in accordance with claim 2, wherein a magnitude of said first rate of application increases linearly with time and a magnitude of said second rate of application increases linearly with time during a process in which the vehicle enters the drive state from the coasting state.

4. A power output control method of a vehicle in accordance with claim 3, wherein the drive torque output from the power system is controlled to be drive torque during the process of the vehicle entering the drive state from the coasting stateT ₃And is andwhereinT ₁In order for the coasting torque to be the coasting torque,t ₁for the elapsed time after the powertrain begins to increase output drive torque,ais the rate at which the magnitudes of the first and second loading rates increase linearly with time.

5. A power output control method of a vehicle in accordance with claim 2, characterized in that the first and second drive engaging surfaces change from a disengaged state to a contacted state during the course of the powertrain increasing the output drive torque at a first loading rate.

6. A power output control method of a vehicle according to claim 5, characterized in that the coasting torque is controlled in accordance with the distance between the first drive engaging surface and the second drive engaging surface, the running speed of the vehicle, and the coasting torqueT ₁And determining the first loading rate such that the first and second drive engaging surfaces change from a disengaged state to a contacting state during the powertrain increasing the output drive torque at the first loading rate.

7. A power output control method of a vehicle in accordance with claim 2, characterized in that said power system is controlled to increase the output driving torque at said second loading rate and then increase the output at a third loading rateUntil the power system outputs the target driving torqueT ₂；

Wherein the second loading rate is greater than the third loading rate.

8. A power output control method of a vehicle in accordance with claim 7, wherein the magnitude of the third rate of loading decreases with time during the vehicle entering the drive state from the coasting state.

9. A power output control method of a vehicle in accordance with claim 7 or 8, characterized in that, in the course of increasing the output drive torque of the powertrain at the second loading rate, when the output drive torque of the powertrain is larger than the output drive torque of the powertrainb·T ₂When the third loading rate is reached, beginning to increase the output drive torque at the third loading rate; wherein the content of the first and second substances,bthe value of (a) is less than 1,T ₂is the target drive torque.

10. The power output control method of the vehicle according to claim 1,

when the vehicle enters a driving state from a coasting state, the target driving torque required to be output by the power system is acquiredT ₂If the first drive engagement surface and the second drive engagement surface are in contact, then sequentially performing the steps of:

controlling the powertrain system to increase the output drive torque at a fourth loading rate; wherein the fourth loading rate is a constant value;

controlling the powertrain system to output the target drive torqueT ₂。

11. A traction control unit characterized by being used to implement the power output control method of a vehicle according to any one of claims 1 to 10.

12. A powertrain system of a vehicle, characterized by comprising an electric machine and a traction control unit according to claim 11; the traction control unit is used for controlling the torque output by the motor.

13. A vehicle comprising the powertrain of claim 12, a driveline and a wheel system, the powertrain in driving connection with the wheel system through the driveline, the driveline comprising at least one stage of drive gearsets, wherein each stage of drive gearsets comprises a drive gear and a driven gear; when the vehicle is in a driving state, meshing surfaces of the driving gear and the driven gear are respectively a first driving meshing surface and a second driving meshing surface, and non-meshing surfaces of the driving gear and the driven gear are respectively a first braking meshing surface and a second braking meshing surface.

Technical Field

The invention belongs to the technical field of vehicles, and particularly relates to a vehicle and a power output control method thereof.

Background

In order to ensure the smooth meshing of the gears, the meshing of the gears must have tooth gaps, and the existence of the tooth gaps causes the collision of a driving gear and a driven gear at the meshing moment of the gears, in particular to the problems of collision of the gears due to the fact that an engine of a fuel vehicle has torque pulsation in advance, noise and abnormal sound caused by the meshing of the gears, and the like.

Disclosure of Invention

In view of the above technical problems, a first object of the present invention is to provide a power output control method of a vehicle, which controls a speed of a backlash change between a driving gear and a driven gear by controlling a torque output from a powertrain of the vehicle, thereby reducing a collision abnormal sound between the driving gear and the driven gear.

A second object of the invention is to propose a traction control unit.

A third object of the present invention is to provide a power system of a vehicle.

A fourth object of the invention is to propose a vehicle.

In order to achieve the above object, a first embodiment of the present invention provides a power output control method for a vehicle, where the vehicle includes a power system, a transmission system and a wheel system, the power system is in transmission connection with the wheel system through the transmission system, the transmission system includes at least one stage of transmission gear set, where each stage of the transmission gear set includes a driving gear and a driven gear; when the vehicle is in a driving state, meshing surfaces of the driving gear and the driven gear are respectively a first driving meshing surface and a second driving meshing surface, and non-meshing surfaces of the driving gear and the driven gear are respectively a first braking meshing surface and a second braking meshing surface; the power output control method includes:

acquiring running resistance borne by a vehicle;

acquiring transmission resistance of the power system in transmission connection with the wheel system through the transmission system;

determining the coasting torque of the vehicle from the driving resistance and the transmission resistanceT ₁；

When the vehicle enters the coasting state from the driving state, controlling the power system to output the coasting torqueT ₁Such that the first brake engagement surface and the second brake engagement surface are in a disengaged condition.

When the vehicle enters the coasting state, the coasting torque is output by controlling the power systemT ₁The first brake meshing surface and the second brake meshing surface are in a separated state instead of completely unloading the driving torque output by the power system, and collision caused by the fact that the backlash of the first brake meshing surface and the second brake meshing surface is rapidly reduced due to the inertia of the driven gear after the driving torque output by the power system is unloaded is avoided, so that collision abnormal sound between the driving gear and the driven gear is greatly relieved, and the service life of the transmission system is prolonged.

In addition, according to the power output control method of the vehicle of the present invention, the following additional technical features may be further provided.

In some examples of the invention, the target drive torque required to be output by the powertrain is obtained when the vehicle enters the drive state from the coasting stateT ₂(ii) a If the first drive engagement surface and the second drive engagement surface are in a disengaged state, sequentially performing the following steps: controlling the powertrain to increase the output drive torque at a first loading rate; controlling the powertrain to increase the output drive torque at a second loading rate; wherein the first loading rate is less than the second loading rate; controlling the powertrain system to output the target drive torqueT ₂。

In some examples of the invention, the magnitude of the first loading rate increases linearly with time and the magnitude of the second loading rate increases linearly with time during the vehicle entering the drive state from the coasting state.

In some examples of the invention, the powertrain is controlled to output a drive torque ofT ₃And is andwhereinT ₁In order for the coasting torque to be the coasting torque,t ₁for the elapsed time after the powertrain begins to increase output drive torque,ais the first additionA rate at which the magnitudes of the loading rate and the second loading rate increase linearly with time.

In some examples of the invention, the first and second drive engaging surfaces change from a disengaged state to a contacting state during the powertrain increases the output drive torque at a first loading rate.

In some examples of the invention, the coasting torque is determined based on a distance between the first drive engaging surface and the second drive engaging surface, a vehicle speed, and the coasting torqueT ₁And determining the first loading rate such that the first and second drive engaging surfaces change from a disengaged state to a contacting state during the powertrain increasing the output drive torque at the first loading rate.

In some examples of the invention, the powertrain is controlled to increase the output drive torque at the second loading rate and then increase the output drive torque at a third loading rate until the powertrain outputs the target drive torqueT ₂(ii) a Wherein the second loading rate is greater than the third loading rate.

In some examples of the invention, the magnitude of the third loading rate decreases over time as the vehicle enters the drive state from the coasting state.

In some examples of the invention, the output drive torque of the powertrain is greater than the first drive torque when the powertrain is increasing the output drive torque at the first loading rateb·T ₂When the third loading rate is reached, beginning to increase the output drive torque at the third loading rate; wherein the content of the first and second substances,bthe value of (a) is less than 1,T ₂is the target drive torque.

In some examples of the invention, the target drive torque required to be output by the powertrain is obtained when the vehicle enters the drive state from the coasting stateT ₂If the first drive engagement surface and the second drive engagement surface are in contact, then sequentially performing the steps of: controlling the powertrain to increase the output drive torque at a fourth loading rateMoment; wherein the fourth loading rate is a constant value; controlling the powertrain system to output the target drive torqueT ₂。

To achieve the above object, an embodiment of a second aspect of the present invention proposes a traction control unit for implementing a power output control method of a vehicle according to the above embodiment.

The traction control unit of the embodiment of the invention outputs the coasting torque by controlling the power system when the vehicle enters the coasting stateT ₁The first brake meshing surface and the second brake meshing surface are in a separated state instead of completely unloading the torque output by the power system, and collision caused by the fact that the backlash of the first brake meshing surface and the second brake meshing surface is rapidly reduced due to the inertia of the driven gear after the torque output by the power system is unloaded is avoided, so that collision abnormal sound between the driving gear and the driven gear is greatly relieved, and the service life of the transmission system is prolonged.

In order to achieve the above object, a third embodiment of the present invention provides a power system, which includes an electric motor and the traction control unit according to the above embodiments; the traction control unit is configured to control the output torque of the motor, thereby implementing the power output control method of the vehicle according to the above embodiment.

In order to achieve the above object, a fourth aspect of the present invention provides a vehicle, including the power system, the transmission system and the wheel system according to the above embodiments, wherein the power system is in transmission connection with the wheel system through the transmission system, the transmission system includes at least one stage of transmission gear set, and each stage of transmission gear set includes a driving gear and a driven gear; when the vehicle accelerates, the meshing surfaces of the driving gear and the driven gear are respectively a first driving meshing surface and a second driving meshing surface, and the non-meshing surfaces of the driving gear and the driven gear are respectively a first braking meshing surface and a second braking meshing surface.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic illustration of a vehicle provided by an embodiment of the present invention.

FIG. 2 is a partial schematic illustration of a vehicle driveline in a drive condition provided by an embodiment of the present invention.

FIG. 3 is a schematic illustration of a portion of a drive train of a vehicle in a coasting condition, according to an embodiment of the present invention.

FIG. 4 is a partial schematic illustration of a vehicle driveline in a braking condition provided by an embodiment of the present invention.

Fig. 5 is a graph illustrating output torque variation of the powertrain system provided by the embodiment of the present invention.

Fig. 6 is a flow chart of a power output control method according to an embodiment of the present invention.

Fig. 7 is a flowchart illustrating a power output control method according to an embodiment of the present invention.

Fig. 8 is a flow chart illustrating a power output control method according to an embodiment of the present invention.

Fig. 9 is a flowchart illustrating a power output control method according to an embodiment of the present invention.

Fig. 10 is a graph illustrating output torque variation of the powertrain system provided by the embodiment of the present invention.

Fig. 11 is a flowchart illustrating a power output control method according to an embodiment of the present invention.

Reference numerals:

100. a vehicle;

10. a power system; 11. a motor; 12. a traction control unit;

20. a transmission system; 21. a shaft gear; 22. a two-axis gear; 23. a three-axis gear; 24. a differential gear; 201. a driving gear; 201a, a first drive engagement surface; 201b, a first brake engagement surface; 202. a driven gear; 202a, a second drive engagement surface; 202b, a second brake engagement surface;

30. a wheel system; 31. a wheel; 32. an axle.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The inventor of the invention discovers through research and analysis that in order to ensure the smooth meshing of the gear, the gear meshing must have a backlash, and the backlash needs to be adjusted and matched according to the standard and test data, so that the smoothness, the temperature rise and the NVH of the gear meshing reach the optimal state. And the existence of backlash causes the gear at the moment of meshing, there is collision in driving gear and driven gear, especially fuel oil car, its engine has torque pulsation in the past, cause the gear to mesh and have collision, cause the noise abnormal sound scheduling problem, in the new energy car/transmission system that the motor drives, because the initial torque of the motor is big, and the torque response speed is faster than fuel oil engine a lot, so the collision noise and the abnormal sound of the meshing of gear, spline are corresponding serious too. In order to solve the above problems in the prior art, there are generally two ways: firstly, the precision of a transmission gear is improved, and the backlash of the gear is reduced, but the technology has strict requirements on the manufacturing process of the gear and a gear box, and has lower production yield and higher cost; secondly, the gaps between teeth are filled with grease to relieve gear collision, however, the degree of relief is limited, and the grease needs to be replenished again when the grease is consumed, which is complicated for after-sales treatment. In view of the above, the inventor improves a power output control method of a vehicle to obtain a technical scheme of the invention.

A vehicle 100, a power output control method thereof, a traction control unit 12, and a power system 10 according to an embodiment of the invention will be described below with reference to fig. 1 to 11.

As shown in fig. 1 and 2, in some embodiments, the vehicle 100 includes a power system 10, a transmission system 20 and a wheel system 30, the power system 10 is in transmission connection with the wheel system 30 through the transmission system 20, and the transmission system 20 includes at least one stage of transmission gear set, wherein each stage of the transmission gear set includes a driving gear 201 and a driven gear 202. In some embodiments, the power system 10 includes an electric motor 11 and a traction control unit 12, the transmission system 20 includes a first shaft gear 21, a second shaft gear 22, a third shaft gear 23, and a differential gear 24 which are engaged in sequence, and the wheel system 30 includes a wheel 31 and an axle 32, wherein an output shaft of the electric motor 11 is in transmission connection with the first shaft gear 21 through splines, and the axle 32 is in transmission connection with the differential gear 24 through splines. Wherein, the first shaft gear 21 and the second shaft gear 22 form a primary transmission gear set through meshing, the first shaft gear 21 is a driving gear, and the second shaft gear is a driven gear; the transmission gear groups of other stages are analogized in turn, and are not described again. It should be noted that, the spline fitting between the shaft spline and the gear spline is similar to the meshing of the gears, and a gap is also required, and there are also problems of collision noise, so the spline fitting between the motor shaft 12 and the shaft gear 21, and the spline fitting between the axle 32 and the differential gear 24 can also be regarded as the fitting of the transmission gear set, and the problem of collision noise can also be solved by the power output control method of the vehicle provided by the embodiment of the present invention.

As shown in fig. 2, in some embodiments, when the vehicle 100 is in a driving state, the power system 20 outputs a driving torque, and the driving gear 21 of each stage of the transmission gear set 20 transmits the driving torque to the driven gear 202 by meshing with the driven gear 201, and finally transmits the driving torque to the wheel 31, so as to drive the vehicle 100, where meshing surfaces of the driving gear 201 and the driven gear 202 are a first driving meshing surface 201a and a second driving meshing surface 202a, respectively, and non-meshing surfaces of the driving gear 201 and the driven gear 202 are a first braking meshing surface 201b and a second braking meshing surface 202b, respectively.

As shown in fig. 3, in some embodiments, when the vehicle 100 is in the coasting state, the vehicle 100 is running by inertia, and the driving gear 201 does not transmit power to the driven gear 202.

As shown in FIG. 4, in some embodiments, vehicle 100 may be braked via powertrain 10. When the vehicle 100 is in a braking state, the power system 20 outputs a braking torque, wherein the direction of the braking torque is opposite to that of the driving torque, and the driving gear 21 of each stage of the transmission gear set 20 transmits the braking torque to the driven gear 202 by meshing with the driven gear 201, and finally transmits the braking torque to the wheel 31, so as to realize braking of the vehicle 100, at this time, meshing surfaces of the driving gear 201 and the driven gear 202 are a first braking meshing surface 201b and a second braking meshing surface 202b respectively, and non-meshing surfaces of the driving gear 201 and the driven gear 202 are a first driving meshing surface 201a and a second driving meshing surface 202a respectively.

The driving engagement surface and the braking engagement surface are defined according to the traveling direction of the vehicle 100, that is, the driving engagement surface when the vehicle 100 travels in the forward direction corresponds to the braking engagement surface when the vehicle travels in the reverse direction, and the braking engagement surface when the vehicle 100 travels in the forward direction corresponds to the driving engagement surface when the vehicle travels in the reverse direction.

As shown in fig. 5 and 6, in some embodiments, the power output control method provided by the present invention includes:

s1, acquiring the running resistance borne by the vehicle 100 and acquiring the transmission resistance of the power system 10 in transmission connection with the wheel system 30 through the transmission system 20;

s2, determining the coasting torque of the vehicle according to the driving resistance and the transmission resistanceT ₁；

S3, when the vehicle 100 enters the coasting state from the driving state, the power system 10 is controlled to output the coasting torqueT ₁So that the first brake engagement surface 201b and the second brake engagement surface 202b are in a disengaged state.

The vehicle 100 (e.g., a railway vehicle such as a high-speed rail, a subway, a light rail, a straddle type monorail, etc.) is often switched back and forth between a driving state, a coasting state, and a braking state during traveling, so the driving engagement surface and the braking engagement surface of the driving gear 201 and the driven gear 202 are also often switched back and forth between a contact state and a separation state, and when the driving engagement surface or the braking engagement surface of the driving gear 201 and the driven gear 202 enters the contact state at a high speed, a relatively serious collision and abnormal sound are caused. For example, in the prior art, when the vehicle 100 enters the coasting state from the driving state, the driving torque will be completely unloaded, and at this time, due to the inertia, the first driving engagement surface 201a will separate from the second driving engagement surface 202a, and the first brake engagement surface 201b will collide with the second brake engagement surface 202 b.

The power output control method of the vehicle 100 according to the embodiment of the invention determines the coasting torque according to the running resistance and the transmission resistanceT ₁And outputs coasting torque by controlling powertrain 10T ₁On the premise that the requirement of the vehicle 100 in the coasting state, that is, running by means of inertia and the driving gear 201 does not transmit power to the driven gear 202, is met, the first braking meshing surface 201b and the second braking meshing surface 202b are in a separated state, so that after the driving system 10 unloads the output driving torque, the backlash between the first braking meshing surface 201b and the second braking meshing surface 202b is rapidly reduced due to the inertia of the driven gear 202, and collision is avoided, thereby greatly reducing the collision abnormal sound between the driving gear 201 and the driven gear 202, and prolonging the service life of the transmission system 20. In some embodiments, the driving resistance and the transmission resistance are calculated by installing a torque sensor at the position of the axle, the gear shaft and the like for detecting the torque applied to the axle, the gear shaft and the like.

Specifically, when the vehicle 100 enters the coasting state, the speed of change of the backlash between the first brake engagement surface 201b and the second brake engagement surface 202b mainly depends on the relative speed difference between the driving gear 201 and the driven gear 202, the speed of rotation of the driving gear 201 mainly depends on the torque output by the power system 10 and the mass of the driving gear 201 (and the transmission gear set upstream of the transmission thereof), and the speed of rotation of the driven gear 202 mainly depends on the running resistance, the transmission resistance and the mass of the driven gear 202 (and the transmission gear set downstream of the transmission thereof). Therefore, the coasting torque is determined based on the running resistance, the transmission resistance, and the quality of the transmission system 20, and based on the condition that the relative rotation speed difference between the driving gear 201 and the driven gear 202 needs to satisfy a certain rangeT ₁So that the first brake engagement surface 201b is in a disengaged state from the second brake engagement surface 202 b.

As shown in fig. 5 and 7, in some embodiments, the power output control method provided by the present invention further includes:

s4, when the vehicle 100 enters the driving state from the idle state, the target driving torque required by the power system 10 is obtainedT ₂；

S5, if the first driving engagement surface 201a and the second driving engagement surface 202a are in the separated state, the power system 10 is controlled to increase the output driving torque at the first loading rate and then increase the output driving torque at the second loading rate; wherein the first loading rate is less than the second loading rate;

s6, controlling the powertrain 10 to output the target drive torqueT ₂。

When the vehicle 100 enters the driving state from the coasting state, the powertrain 10 applies the driving torque to drive the driving gear 201 to rotate at an accelerated speed, and the first driving engagement surface 201a and the second driving engagement surface 202a finally enter the contact state. Therefore, if the first driving engagement surface 201a and the second driving engagement surface 202a are separated initially, the first driving engagement surface 201a and the second driving engagement surface 202a may collide seriously and generate abnormal sound during acceleration of the driving gear 201.

According to the power output control method of the vehicle 100 provided by the embodiment of the invention, the driving torque output by the power system 10 is increased at a smaller first loading rate, so that the distance between the first driving meshing surface 201a and the second driving meshing surface 202a is relatively slowly reduced, the driving gear 201 is prevented from obtaining a larger acceleration stroke to increase the relative rotation speed difference between the driving gear 201 and the driven gear 202, and the first driving meshing surface 201a and the second driving meshing surface 202a are prevented from being seriously collided; the powertrain system is then controlled to increase the output drive torque at a second, greater load rate to rapidly increase the drive torque to approach the target drive torqueT ₂To meet the driving state demand of the vehicle 100.

In some embodiments, the magnitude of the first loading rate increases linearly with time and the magnitude of the second loading rate increases linearly with time during the vehicle 100 entering the drive state from the limp-home state. That is, controlling the power system 10 to increase the output drive torque at a loading rate that gradually increases from slow to fast further improves the efficiency and smoothness of torque loading while avoiding a more severe collision of the first drive engaging surface 201a with the second drive engaging surface 202 a.

As shown in FIG. 5, in some embodiments, during the transition of the vehicle 100 from the limp-home state to the drive state, the drive torque output by the powertrain system 10 is controlled to beT ₃And is andwhereinT ₁In order to provide the coasting torque,t ₁for the time elapsed after powertrain 10 begins to increase output drive torque,ais the rate at which the magnitudes of the first and second loading rates increase linearly with time. That is, the drive torque output by the power system 10 is controlledT ₃To relate to timet ₁The second power characteristic of the torque loading device is used for loading, the characteristics that the loading speed is increased linearly after the slow loading are achieved, and the torque loading efficiency and the smoothness are further improved while the first driving meshing surface 201a and the second driving meshing surface 202a are prevented from being seriously collided.

In some embodiments, the first and second drive engaging surfaces 201a, 202a change from a disengaged state to a contacting state during the increase in output drive torque of the powertrain 10 at the first loading rate. By controlling the first loading rate, the first drive engaging surface 201a and the second drive engaging surface 202a are brought into contact during relatively slow loading of the drive torque by the powertrain 10, avoiding a relatively severe collision of the first drive engaging surface 201a with the second drive engaging surface 202 a.

In some embodiments, the travel speed and coasting torque of the vehicle 10 are based on the distance of the first drive engaging surface 201a from the second drive engaging surface 202aT ₁The first loading rate is determined such that the first drive engaging surface 201a and the second drive engaging surface 202a change from a disengaged state to a contacting state during the power system 10 increasing the output drive torque at the first loading rate.

As shown in fig. 5 and 8, in some embodiments, the power output control method provided by the present invention further includes:

s7, control power system 10 to second loadAfter increasing the output drive torque at the rate, the output drive torque is increased at a third loading rate until the powertrain 10 outputs the target drive torqueT ₂(ii) a Wherein the second loading rate is greater than the third loading rate.

Rapidly loading the driving torque at a second loading rate higher than the target driving torqueT ₂Then, the driving torque is slowly applied at a third, smaller application rate to smoothly achieve the target driving torqueT ₂That is, the smoothness of the torque loading is further improved while satisfying the driving state demand of the vehicle 100.

As shown in FIG. 5, in some embodiments, the magnitude of the third loading rate decreases over time during the vehicle's transition from the coasting state to the driving state. That is, the power system 10 is controlled to increase the output drive torque at a load rate gradually increasing from fast to slow to gently reach the target drive torqueT ₂And the smoothness of torque loading is further improved.

As shown in fig. 9, in some embodiments, the power output control method provided by the present invention further includes:

s8, during the process that the power system 10 increases the output driving torque at the second loading rate, when the power system 10 outputs the driving torqueT ₃Is greater thanb·T ₂At the same time, beginning to increase the output drive torque at the third loading rate; wherein the content of the first and second substances,bthe value of (a) is less than 1,T ₂is the target drive torque. In particular, the amount of the solvent to be used,bthe value of (a) falls within the range of 85% -97%; in particular, the amount of the solvent to be used,bmay be 95%.

As shown in FIG. 5, in some embodiments, during the increase in output drive torque of powertrain 10 at the third load rate, drive torque output by powertrain 10 isT ₄Is composed ofWhereinT ₂In order to achieve the target drive torque,t ₂for the time elapsed after powertrain 10 begins to increase output drive torque at the third loading rate,cis a torque loading factor (in units of N m/s), i.e.T ₄Andt ₂satisfy the requirement ofI.e. the driving torque output by the powertrain 10T ₄To relate to timet ₂The circular characteristic or the elliptical characteristic has the characteristics of quick loading first and slow loading later, and the loading is carried out when the circular characteristic or the elliptical characteristic is usedt ₂Equal to (1-b)T ₂/cWhen the temperature of the water is higher than the set temperature,T ₄equal to the target drive torqueT ₂And the loading rate is 0, the target driving torque is smoothly achievedT ₂The purpose of further improving the smoothness of torque loading is achieved.

As shown in fig. 10 and 11, in some embodiments, the power output control method provided by the present invention further includes:

s9, when the vehicle 100 enters the driving state from the idle state, the target driving torque required by the power system 10 is obtainedT ₂；

S10, if the first drive engagement surface 201a and the second drive engagement surface 202a are in contact, controlling the power system 10 to increase the output drive torque at a fourth loading rate; wherein the fourth loading rate is a constant value;

s11, controlling the powertrain 10 to output the target drive torqueT ₂。

When the vehicle 100 enters the driving state from the coasting state, if the first driving engagement surface 201a and the second driving engagement surface 202a are initially in contact with each other, the first driving engagement surface 201a and the second driving engagement surface 202a are less likely to collide with each other seriously during acceleration of the driving gear 201, so that the control power system 10 loads the output driving torque at a constant fourth loading rate (i.e., linearly) to smoothly and quickly reach the target driving torqueT ₂To meet the driving state demand of the vehicle 100.

In order to implement the above-described embodiment, the present invention also proposes a traction control unit 12 for implementing the power output control method of the vehicle 100 as described in the above-described embodiment. The traction control unit 12 of the embodiment of the present invention performs power output control on the vehicle 100 by acquiring information, calculating data, executing a series of determination and other programs, thereby avoiding the problem of a serious collision occurring in the engagement process of gears.

In order to implement the above-mentioned embodiment, the present invention also proposes a power system 10, which includes a motor 11 and a traction control unit 12 according to the above-mentioned embodiment. The traction control unit 12 is configured to control the output torque of the motor 11, thereby implementing the power distribution method of the vehicle 100 as described in the above embodiment. Comprising an electric motor 11 and a traction control unit 12 according to the above described embodiment; the traction control unit 12 is configured to control the output torque of the motor 11, thereby implementing the power output control method of the vehicle 100 as described in the above embodiment.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.