CN117307704A

CN117307704A - Method and device for controlling rear axle upshift of vehicle, vehicle and storage medium

Info

Publication number: CN117307704A
Application number: CN202210723442.3A
Authority: CN
Inventors: 王肖
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2023-12-29

Abstract

The embodiment of the application is suitable for the technical field of vehicle control, and provides a method and device for controlling rear axle upshift of a vehicle, the vehicle and a storage medium, wherein the method comprises the following steps: in the running process of the vehicle, acquiring front axle torque of a front axle and rear axle torque of a rear axle of the vehicle, and determining the whole vehicle torque of the current vehicle according to the front axle torque and the rear axle torque; if the whole vehicle torque of the current vehicle is in the preset torque range, determining the target torque of the front axle according to the front axle torque and the rear axle torque; the maximum value of the preset torque range is smaller than the whole vehicle torque during normal upshift of the rear axle; the sum of the target torque of the front axle and the torque of the rear axle is larger than or equal to the whole vehicle torque of the current vehicle; and lifting the front axle torque to the target torque through a target motor in the front axle so as to realize the rear axle upshift of the vehicle. By adopting the method, the acceleration drop of the vehicle in the process of the upshift of the rear axle can be avoided.

Description

Method and device for controlling rear axle upshift of vehicle, vehicle and storage medium

Technical Field

The application belongs to the technical field of vehicle control, and particularly relates to a method and device for controlling a rear axle upshift of a vehicle, the vehicle and a storage medium.

Background

Vehicles have become one of the important vehicles for people to walk instead. Vehicles typically include a front axle, which is a device for transmitting forces in all directions between the vehicle frame and the front wheels and the torque produced by the forces, and a rear axle, which is a device for supporting the wheels and connecting the rear wheels. In addition, in order to reduce the exhaust emission of the vehicle, a catalyst is usually further arranged in the engine of the vehicle, and the catalyst has higher activity at the temperature higher than 500 ℃, so that the catalyst can be well contacted with the exhaust emission of the vehicle, and the purpose of purifying the exhaust emission of the vehicle is realized.

In general, a vehicle is required to perform a rear axle upshift during acceleration, and when the rear axle upshift is performed, it is required to reduce the rear axle torque and simultaneously start the engine. When the engine is started, the catalyst can be heated at the same time, so that the activity of the catalyst is increased, and the tail gas purifying effect is improved. In general, in order to avoid overheating the catalyst, it is necessary to limit the torque at the time of engine start in the front axle of the vehicle, which may result in a limited front axle torque of the vehicle. Therefore, when the vehicle is in a rear axle upshift, the rear axle torque of the vehicle can be reduced, and meanwhile, the front axle torque of the vehicle can be limited based on the consideration of the activity of the catalyst, so that the whole vehicle torque of the vehicle in the rear axle upshift process can be reduced, and the acceleration of the vehicle in the rear axle upshift process can be reduced.

Disclosure of Invention

The embodiment of the application provides a method and device for controlling the upshift of a rear axle of a vehicle, the vehicle and a storage medium, and the problem that the acceleration of the vehicle is reduced in the upshift process of the rear axle can be solved.

In a first aspect, embodiments of the present application provide a method of controlling a rear axle upshift of a vehicle, the method comprising:

in the running process of the vehicle, acquiring front axle torque of a front axle and rear axle torque of a rear axle of the vehicle, and determining the whole vehicle torque of the current vehicle according to the front axle torque and the rear axle torque;

if the whole vehicle torque of the current vehicle is in the preset torque range, determining the target torque of the front axle according to the front axle torque and the rear axle torque; the maximum value of the preset torque range is smaller than the whole vehicle torque during normal upshift of the rear axle; the sum of the target torque of the front axle and the torque of the rear axle is larger than or equal to the whole vehicle torque of the current vehicle;

and lifting the front axle torque to the target torque through a target motor in the front axle so as to realize the rear axle upshift of the vehicle.

In a second aspect, embodiments of the present application provide an apparatus for controlling a rear axle upshift of a vehicle, the apparatus comprising:

the acquisition module is used for acquiring the front axle torque of the front axle and the rear axle torque of the rear axle of the vehicle in the running process of the vehicle, and determining the whole vehicle torque of the current vehicle according to the front axle torque and the rear axle torque;

the determining module is used for determining the target torque of the front axle according to the front axle torque and the rear axle torque if the whole vehicle torque of the current vehicle is in the preset torque range; the maximum value of the preset torque range is smaller than the whole vehicle torque during normal upshift of the rear axle; the sum of the target torque of the front axle and the torque of the rear axle is larger than or equal to the whole vehicle torque of the current vehicle;

and the lifting module is used for lifting the front axle torque to the target torque through a target motor in the front axle so as to realize the rear axle upshift of the vehicle.

In a third aspect, embodiments of the present application provide a vehicle comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the method of the first aspect as described above when executing the computer program.

In a fourth aspect, embodiments of the present application provide a computer readable storage medium storing a computer program which, when executed by a processor, implements a method as in the first aspect described above.

In a fifth aspect, embodiments of the present application provide a computer program product for, when run on a vehicle, causing the vehicle to perform the method of the first aspect described above.

Compared with the prior art, the embodiment of the application has the beneficial effects that: and in the running process of the vehicle, acquiring the front axle torque of the front axle and the rear axle torque of the rear axle of the vehicle, and determining the whole vehicle torque of the vehicle according to the front axle torque and the rear axle torque. And when the torque of the whole vehicle is in a preset torque range, determining the target torque of the front axle according to the torque of the front axle and the torque of the rear axle, and lifting the torque of the front axle to the target torque through a target motor in the front axle so as to finish the upshift of the rear axle. The sum of the target torque after the front axle is lifted and the rear axle torque is larger than or equal to the whole vehicle torque during the vehicle driving process before the rear axle upshift. Therefore, the torque of the whole vehicle after upshift is not lower than the torque of the whole vehicle before upshift. Further, it is ensured that the acceleration of the vehicle during upshifts does not decrease. In addition, because the maximum value of the preset torque range is smaller than the whole vehicle torque during the normal upshift of the rear axle, the whole vehicle torque of the vehicle after the upshift can be determined to be smaller than the whole vehicle torque during the normal upshift of the rear axle. Therefore, the vehicle can directly boost the front axle torque of the front axle according to the target motor in the front axle without the vehicle being required to perform upshifting by the engine. And the limitation of the front axle torque is avoided when the engine is started.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flowchart of an implementation of a method of controlling a rear axle upshift of a vehicle according to one embodiment of the present application;

FIG. 2 is a schematic structural view of an apparatus for controlling a rear axle upshift of a vehicle according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

In addition, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

At present, in the process of upshifting a rear axle of a vehicle, the rear axle torque of the rear axle needs to be reduced, an engine positioned in a front axle is started simultaneously, and the front axle torque of the front axle can be improved by controlling the engine to work, so that the whole vehicle torque of the vehicle in the process of upshifting the rear axle is improved, and the speed of the vehicle is improved, so that the upshifting of the rear axle is completed. However, the engine in the front axle is started and enters the heating process of the catalyst at the same time. In general, in order to prevent overheating of the catalyst, it is necessary to limit the torque at the time of engine start in the front axle in order to terminate the heating process of the catalyst as soon as possible. It can be seen that this results in a limited front axle torque of the vehicle. That is, when the vehicle performs a rear axle upshift, the rear axle torque of the vehicle may be reduced, and meanwhile, based on the consideration of the catalyst activity, the front axle torque of the vehicle may be limited, which may cause the entire vehicle torque of the vehicle to be reduced during the rear axle upshift, and further cause the acceleration of the vehicle to be reduced during the rear axle upshift.

Based on this, in order to avoid that the front axle torque of the front axle is limited so that the acceleration during the upshift of the vehicle is reduced when the upshift of the rear axle is performed, the embodiment of the present application provides a method for controlling the upshift of the rear axle of the vehicle, which may be used for a device for controlling the upshift of the rear axle of the vehicle. The device for controlling the rear axle upshift of the vehicle may be provided in a vehicle in which a rear axle upshift is required.

Specifically, referring to fig. 1, fig. 1 shows a flowchart of an implementation of a method for controlling a rear axle upshift of a vehicle according to an embodiment of the present application, where the method includes the following steps:

s101, acquiring front axle torque of a front axle and rear axle torque of a rear axle of the vehicle in the running process of the vehicle, and determining the whole vehicle torque of the current vehicle according to the front axle torque and the rear axle torque.

In one embodiment, the front axle is a device for transmitting the forces in all directions between the frame and the front wheel and the torque generated by the forces. The rear axle refers to a rear drive axle component of a vehicle power transmission that may be used to support a frame, wheels, and connect and transmit power from the frame to the rear wheels.

It should be noted that the rear axle is composed of two half axles, so that the differential motion of the half axles can be realized. If the vehicle is a front axle driven vehicle, the rear axle is only a follow-up axle, i.e. only plays a bearing role. If the vehicle is a rear axle driven vehicle, the rear axle can also perform the functions of driving, decelerating and differentiating besides the bearing function, and will not be described in detail.

In addition, torque is a special moment for rotating an object, and the torque is one of main indexes of a vehicle, and can reflect corresponding vehicle performance. For example, vehicle performance may include acceleration, hill climbing capability, and the like. In the field of vehicles, the driving force for driving the vehicle to travel is related to torque. In general, the higher the vehicle torque after upshifting, the greater the acceleration, that is, the higher the driving force. The whole vehicle torque is the sum of the front axle torque of the front axle and the rear axle torque of the rear axle of the vehicle.

The definition of torque is the cross-multiplication of displacement and force, and physically, the force for rotating an object is multiplied by the distance from the rotation axis. Therefore, the front axle torque and the rear axle torque can be calculated according to the parameters respectively, and then are acquired by a device for controlling the rear axle upshift of the vehicle. Thus, the device for controlling the rear axle upshift of the vehicle can obtain the whole vehicle torque when the vehicle runs.

When the vehicle is running, it generally has various running modes such as acceleration, deceleration, and uniform speed. For an accelerated driving mode, it is generally necessary to upshift the rear axle of the vehicle. For example, the original way is: the engine works to drive the front axle, so that the speed of the vehicle is increased, the output of the front axle torque of the front axle is increased, the rear axle torque output of the rear axle is reduced, and the rear axle upshift of the vehicle is realized.

S102, if the whole vehicle torque of the current vehicle is in a preset torque range, determining the target torque of the front axle according to the front axle torque and the rear axle torque; the maximum value of the preset torque range is smaller than the whole vehicle torque during normal upshift of the rear axle; the sum of the target torque of the front axle and the torque of the rear axle is larger than or equal to the whole vehicle torque of the current vehicle.

In an embodiment, the preset torque range may be set according to practical situations, which is not limited. The maximum value of the preset torque range should be smaller than the whole vehicle torque during normal upshift of the rear axle. For example, the predetermined torque range may be 170 to 1000 nanometers (Nm).

It will be appreciated that the above description has been given of the fact that the higher the overall torque of the vehicle, the greater the acceleration, i.e., the higher the driving force, at the time of upshifting. Therefore, it is considered that the greater the acceleration and the higher the driving force, the higher the vehicle speed corresponding to the vehicle will be. Based on this, when the maximum value of the preset torque range is smaller than the vehicle torque at the time of the normal upshift of the rear axle, it can be considered that the vehicle speed corresponding to the maximum value of the preset torque range will also be smaller than the vehicle speed corresponding to the vehicle torque at the time of the normal upshift of the rear axle.

For example, in the present embodiment, when a rear axle upshift is required, the vehicle may be upshifted in advance at a standard vehicle speed corresponding to when the vehicle does not reach a normal upshift. For example, when the number of gears 1 is adjusted to the number of gears 2, the standard vehicle speed corresponding to the normal gear shift may be 130 kilometers per hour (km/h), and the vehicle speed corresponding to the maximum value of the preset torque range may be 110km/h. At this time, the vehicle may perform upshift forcibly when the vehicle speed reaches 110km/h.

In addition, when executing a rear axle upshift, the vehicle may first determine the corresponding preset torque range in a subsequent manner. Specifically, the device for controlling the rear axle upshift of the vehicle may acquire in advance a target upshift point at the time of the rear axle upshift; the target upshift point is lower than the standard upshift point when the rear axle is in normal upshift; then, a preset torque range is determined according to the target upshift point.

The upshift point may be regarded as an upshift timing when the vehicle is upshifted. Specifically, the upshift point is generally determined by parameters such as the vehicle speed and the accelerator opening degree. In this embodiment, the upshift point may be determined according to the vehicle speed. Meanwhile, in the upshift, the number of upshifts is usually multiple, so each number of upshifts can be set with different target upshift points, which is not limited.

For example, when the rear axle is shifted from 1 gear to 2 gears, the vehicle speed corresponding to the standard upshift point when the rear axle is shifted up normally may be 130km/h, and at this time, the target upshift point may be 110km/h lower than 130km/h, which is not limited.

In addition, it should be noted that each target upshift point may correspond to a vehicle speed, so after determining the target upshift point, the device for controlling the rear axle upshift of the vehicle may also directly query or calculate the corresponding preset torque range according to the vehicle speed, and in this embodiment, the manner of querying or calculating the corresponding preset torque range according to the vehicle speed is not limited.

It should be added that, although the rear axle torque will decrease and the front axle torque will increase during the upshift of the rear axle, the sum of the target torque and the rear axle torque during the upshift needs to be greater than or equal to the current vehicle torque in order to ensure that the acceleration of the vehicle during the upshift will not decrease. That is, the difference between the target torque of the front axle and the front axle torque before upshift needs to be at least equal to or greater than the torque reduction amount of the rear axle torque at the time of upshift.

Specifically, the device for controlling the rear axle upshift of the vehicle may determine the torque reduction amount of the rear axle torque according to the rear axle torque; then, the sum of the torque reduction amount and the front axle torque is determined as the target torque. When determining the torque reduction amount, a difference between the rear axle torque and the preset rear axle torque may be determined as the torque reduction amount.

The preset rear axle torque may be set according to actual situations, which is not limited. For example, the preset rear axle torque may be 0Nm. That is, when the rear axle upshift is required, the value of the rear axle torque is the torque reduction amount of the rear axle torque at the time of the upshift. Then, the sum of the torque reduction amount and the front axle torque may be determined as the target torque. At this time, since the rear axle torque at the time of upshift will be reduced to 0, the target torque may be regarded as the vehicle-whole torque at the time of upshift. That is, the sum of the target torque and the rear axle torque at the time of upshift will be equal to the entire vehicle torque of the current vehicle. Therefore, the acceleration of the vehicle in upshift can be ensured not to be reduced, and the acceleration of the vehicle in upshift can be ensured not to be suddenly changed.

S103, the front axle torque is lifted to the target torque through the target motor in the front axle, so that the rear axle upshift of the vehicle is realized.

In one embodiment, since the maximum value of the preset torque range is smaller than the whole vehicle torque at the time of the normal upshift of the rear axle, it can be determined that the whole vehicle torque of the vehicle after the upshift will also be smaller than the whole vehicle torque at the time of the normal upshift of the rear axle. Therefore, the vehicle can directly boost the front axle torque of the front axle according to the target motor in the front axle without the vehicle being required to perform upshifting by the engine. And the limitation of the front axle torque is avoided when the engine is started.

When the front axle torque is lifted to the target torque through the target motor, the device for controlling the rear axle upshift of the vehicle can determine the first rotating speed of the target shaft in the front axle corresponding to the target torque; determining a second rotating speed of the target motor according to the first rotating speed; the target motor is controlled to rotate at a second rotating speed so as to drive the target shaft to rotate at a first rotating speed. Further, the torque generated when the target motor operates can be transmitted to the front axle through the drive target shaft, and the front axle torque can be further raised to the target torque.

In an embodiment, when the vehicle is driven by hybrid power, the vehicle may be driven not only by an engine but also by an electric motor. The motors are typically disposed in a front axle and a rear axle, respectively, and when the vehicle is a rear axle-driven vehicle, the motors can be operated as rear axle motors to generate driving force to rear wheels of the vehicle. When the vehicle is a front-axle-driven vehicle, the front axle may generate driving force to the front wheels of the vehicle through the front-axle motor.

The target motor may be regarded as a front axle motor located at a front axle in a vehicle, for example. Specifically, the target motor may be a P2 motor in a vehicle. Where "P" in the "P2 motor" indicates the position of the target motor in the hybrid drive system, and "2" indicates that the position is located specifically between the transmission and the engine of the vehicle and behind the clutch of the vehicle. It can be appreciated that since the clutch is provided between the P2 motor and the engine, the P2 motor can drive the front wheels of the vehicle alone, realizing the pure electric mode of the vehicle.

In one embodiment, the target shaft is an input shaft of a clutch in a vehicle. The clutch is a device for transmitting engine power of a vehicle or other power machine to an axle in a switching manner. Typically, a clutch is mounted between the engine and the transmission, which is an assembly in the vehicle driveline that is directly associated with the engine, which may drive the front wheels of the vehicle through an input shaft. The actions of the clutches include, but are not limited to, shifting gears and preventing driveline overload in the vehicle, which will not be described in detail.

In one embodiment, the target shaft may be rotated at different first rotational speeds to generate different torques. Accordingly, the first rotation speed corresponding to each target torque may be stored in the vehicle interior in advance, so that the device that controls the rear axle upshift of the vehicle can determine the first rotation speed corresponding to the current target torque at any time.

It should be noted that, as is apparent from the above explanation of the target motor, the P2 motor is located behind the clutch, so if the target motor needs to be controlled to drive the target shaft at the first rotational speed so as to transmit the torque generated when the target motor operates to the front axle through the drive target shaft, the rotational speed of the target motor needs to be set.

Specifically, the device for controlling the rear axle upshift of the vehicle may determine the target rotation speed range according to the first rotation speed and the preset rotation speed difference; wherein the difference between any one of the target rotational speeds and the first rotational speed is less than or equal to a preset rotational speed difference; then, any one of the target rotational speeds is determined as the second rotational speed.

The preset rotational speed difference may be set in advance according to an actual situation, for example, a preset rotational speed difference threshold may be preset in a device for controlling an upshift of a rear axle of the vehicle, and then any value smaller than the preset rotational speed difference threshold may be determined to be the preset rotational speed difference. In this embodiment, the preset rotation speed difference may be 0. That is, when the motor rotation speed needs to be adjusted, the second rotation speed of the target motor should be equal to the first rotation speed.

It is understood that when the preset rotation speed difference is other values, the second rotation speed of the target motor may be greater than the first rotation speed or may be less than the first rotation speed when the second rotation speed of the target motor is determined. That is, the second rotational speed determined at this time should be a target rotational speed range. After that, the device that controls the rear axle upshift of the vehicle may determine any one of the target rotation speed ranges as the second rotation speed, which is not limited.

When any one of the target rotational speeds is determined as the second rotational speed, the second rotational speed is considered to be close to the first rotational speed at this time. Thus, the target motor may be coupled to the input shaft at the same rotational speed as the input shaft. Further, the torque generated by the target motor when operating can be transmitted to the front axle through the target shaft to raise the front axle torque to the target torque.

The motor rotation speed of the target motor is adjusted by the adjustment mode. It will be appreciated that in another embodiment, the means for controlling the rear axle upshift of the vehicle may also be adapted to the first rotational speed. For example, the means for controlling the rear axle upshift of the vehicle may also determine the first rotation speed of the target motor corresponding to the target torque in advance. Then, the second rotation speed of the target shaft is determined based on the first rotation speed and the set rotation speed difference, which is not limited.

It should be noted that, when the torque of the entire vehicle is within the preset torque range, that is, the vehicle performs the upshift of the rear axle, the device for controlling the upshift of the rear axle of the vehicle should control the engine in the front axle to stop working. As can be seen from the description of S103 above, during the upshift of the rear axle, the vehicle should boost the front axle torque by the target motor of the front axle, rather than by the engine operation. Therefore, when the engine is started, the front axle torque of the vehicle is limited due to the fact that the catalyst is required to be heated, and the whole vehicle torque of the vehicle is reduced in the process of upshifting of the rear axle, so that the acceleration of the vehicle is reduced in the process of upshifting of the rear axle.

In this embodiment, during the running of the vehicle, the front axle torque of the front axle and the rear axle torque of the rear axle of the vehicle are obtained, and the entire vehicle torque of the vehicle is determined according to the front axle torque and the rear axle torque. And when the torque of the whole vehicle is in a preset torque range, determining the target torque of the front axle according to the torque of the front axle and the torque of the rear axle, and lifting the torque of the front axle to the target torque through a target motor in the front axle so as to finish the upshift of the rear axle. The sum of the target torque after the front axle is lifted and the rear axle torque is larger than or equal to the whole vehicle torque during the vehicle driving process before the rear axle upshift. Therefore, the torque of the whole vehicle after upshift is not lower than the torque of the whole vehicle before upshift. Further, it is ensured that the acceleration of the vehicle during upshifts does not decrease. In addition, because the maximum value of the preset torque range is smaller than the whole vehicle torque during the normal upshift of the rear axle, the whole vehicle torque of the vehicle after the upshift can be determined to be smaller than the whole vehicle torque during the normal upshift of the rear axle. Therefore, the vehicle can directly boost the front axle torque of the front axle according to the target motor in the front axle without the vehicle being required to perform upshifting by the engine. And the limitation of the front axle torque is avoided when the engine is started.

Referring to fig. 2, fig. 2 is a block diagram of an apparatus for controlling a rear axle upshift of a vehicle according to an embodiment of the present application. The apparatus for controlling a rear axle upshift of a vehicle in this embodiment includes modules for performing the steps in the corresponding embodiment of fig. 1. Refer specifically to fig. 1 and the related description in the embodiment corresponding to fig. 1. For convenience of explanation, only the portions related to the present embodiment are shown. Referring to fig. 2, an apparatus 200 for controlling a rear axle upshift of a vehicle may include: an acquisition module 210, a determination module 220, and a lifting module 230, wherein:

the acquiring module 210 is configured to acquire a front axle torque of a front axle and a rear axle torque of a rear axle of the vehicle during driving of the vehicle, and determine a vehicle torque of the current vehicle according to the front axle torque and the rear axle torque.

A determining module 220, configured to determine a target torque of the front axle according to the front axle torque and the rear axle torque if the entire vehicle torque of the current vehicle is within a preset torque range; the maximum value of the preset torque range is smaller than the whole vehicle torque during normal upshift of the rear axle; the sum of the target torque of the front axle and the torque of the rear axle is larger than or equal to the whole vehicle torque of the current vehicle.

The lifting module 230 is configured to lift the front axle torque to a target torque by a target motor in the front axle to achieve a rear axle upshift of the vehicle.

In an embodiment, the determining module 220 is further configured to:

determining the torque reduction amount of the rear axle torque according to the rear axle torque; the sum of the torque reduction amount and the front axle torque is determined as the target torque.

In an embodiment, the determining module 220 is further configured to:

and determining the difference between the rear axle torque and the preset rear axle torque as the torque reduction amount.

In one embodiment, the lifting module 230 is further configured to:

determining a first rotating speed of a target shaft in a front axle corresponding to the target torque; determining a second rotating speed of the target motor according to the first rotating speed; the target motor is controlled to rotate at a second rotating speed so as to drive the target shaft to rotate at a first rotating speed.

In one embodiment, the lifting module 230 is further configured to:

determining a target rotating speed range according to the first rotating speed and a preset rotating speed difference; the difference between any one of the target rotational speeds and the first rotational speed is less than or equal to a preset rotational speed difference; any one of the target rotational speeds is determined as the second rotational speed.

In one embodiment, the apparatus 200 for controlling a rear axle upshift of a vehicle further includes:

the target upshift point acquisition module is used for acquiring a target upshift point during upshift of the rear axle; the target upshift point is lower than the standard upshift point at the time of the normal upshift of the rear axle.

The preset torque range determining module is used for determining a preset torque range according to the target upshift point.

In an embodiment, the determining module 220 is further configured to:

and if the whole torque of the current vehicle is in the preset torque range, controlling the engine in the front axle to stop working, and determining the target torque of the front axle according to the front axle torque and the rear axle torque.

It should be understood that, in the block diagram of the apparatus for controlling a rear axle upshift of a vehicle shown in fig. 2, each module is configured to execute each step in the embodiment corresponding to fig. 1, and each step in the embodiment corresponding to fig. 1 is explained in detail in the foregoing embodiment, and specific reference is made to the related description in the embodiment corresponding to fig. 1, which is not repeated herein.

Fig. 3 is a block diagram of a vehicle according to an embodiment of the present application. As shown in fig. 3, the vehicle 300 of this embodiment includes: a processor 310, a memory 320, and a computer program 330 stored in the memory 320 and executable on the processor 310, such as a program for controlling a method of upshifting a rear axle of a vehicle. The processor 310, when executing the computer program 330, implements the steps described above in various embodiments of methods of controlling a rear axle upshift of a vehicle, such as S101 through S103 shown in fig. 1. Alternatively, the processor 310 may implement the functions of the modules in the embodiment corresponding to fig. 2, for example, the functions of the modules 210 to 230 shown in fig. 2, when executing the computer program 330, and refer to the related description in the embodiment corresponding to fig. 2.

For example, the computer program 330 may be partitioned into one or more modules that are stored in the memory 320 and executed by the processor 310 to implement the method of controlling a rear axle upshift of a vehicle provided by embodiments of the present application. One or more of the modules may be a series of computer program instruction segments capable of performing particular functions for describing the execution of the computer program 330 in the vehicle 300. For example, computer program 330 may implement a method of controlling a rear axle upshift of a vehicle provided by embodiments of the present application.

The vehicle 300 may include, but is not limited to, a processor 310, a memory 320. It will be appreciated by those skilled in the art that fig. 3 is merely an example of a vehicle 300 and is not intended to limit the vehicle 300, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the vehicle may further include input and output devices, network access devices, buses, etc.

The processor 310 may be a central processing unit, but may also be other general purpose processors, digital signal processors, application specific integrated circuits, off-the-shelf programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 320 may be an internal storage unit of the vehicle 300, such as a hard disk or a memory of the vehicle 300. The memory 320 may also be an external storage device of the vehicle 300, such as a plug-in hard disk, a smart memory card, a flash memory card, etc. provided on the vehicle 300. Further, the memory 320 may also include both internal storage units and external storage devices of the vehicle 300.

Embodiments of the present application provide a computer readable storage medium comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing a method of controlling a rear axle upshift of a vehicle as in the respective embodiments described above when executing the computer program.

Embodiments of the present application provide a computer program product for causing a vehicle to perform the method of controlling a rear axle upshift of the vehicle in the respective embodiments described above when the computer program product is run on the vehicle.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A method of controlling a rear axle upshift of a vehicle, the method comprising:

in the running process of the vehicle, acquiring front axle torque of a front axle and rear axle torque of a rear axle of the vehicle, and determining the current whole vehicle torque of the vehicle according to the front axle torque and the rear axle torque;

if the current whole vehicle torque of the vehicle is in a preset torque range, determining a target torque of the front axle according to the front axle torque and the rear axle torque; the maximum value of the preset torque range is smaller than the whole vehicle torque during normal upshift of the rear axle; the sum of the target torque of the front axle and the torque of the rear axle is larger than or equal to the current whole vehicle torque of the vehicle;

2. The method of claim 1, wherein said determining a target torque for said front axle based on said front axle torque and said rear axle torque comprises:

determining a torque reduction amount of the rear axle torque according to the rear axle torque;

and determining the sum of the torque reduction amount and the front axle torque as the target torque.

3. The method of claim 2, wherein said determining a torque reduction amount of said rear axle torque from said rear axle torque comprises:

and determining the difference value between the rear axle torque and the preset rear axle torque as the torque reduction amount.

4. The method of claim 1, wherein the boosting the front axle torque to the target torque by a target motor in the front axle comprises:

determining a first rotating speed of a target shaft in the front axle corresponding to the target torque;

determining a second rotating speed of the target motor according to the first rotating speed;

and controlling the target motor to rotate at the second rotating speed so as to drive the target shaft to rotate at the first rotating speed.

5. The method of claim 4, wherein said determining a second rotational speed of the target motor from the first rotational speed comprises:

determining a target rotating speed range according to the first rotating speed and a preset rotating speed difference; the difference between any one of the target rotational speeds and the first rotational speed is less than or equal to the preset rotational speed difference;

any one of the target rotational speeds is determined as the second rotational speed.

6. The method according to any one of claims 1-5, further comprising, before the determining the target torque of the front axle from the front axle torque and the rear axle torque if the current vehicle torque is within a preset torque range:

acquiring a target upshift point when the rear axle upshifts; the target upshift point is lower than a standard upshift point during normal upshift of the rear axle;

and determining the preset torque range according to the target upshift point.

7. The method according to any one of claims 1-5, wherein determining the target torque of the front axle based on the front axle torque and the rear axle torque if the current vehicle torque of the vehicle is within a preset torque range comprises:

and if the current whole vehicle torque of the vehicle is in a preset torque range, controlling an engine in the front axle to stop working, and determining the target torque of the front axle according to the front axle torque and the rear axle torque.

8. An apparatus for controlling a rear axle upshift of a vehicle, the apparatus comprising:

the acquisition module is used for acquiring front axle torque of a front axle and rear axle torque of a rear axle of the vehicle in the running process of the vehicle, and determining the current whole vehicle torque of the vehicle according to the front axle torque and the rear axle torque;

the determining module is used for determining the target torque of the front axle according to the front axle torque and the rear axle torque if the current whole vehicle torque of the vehicle is in a preset torque range; the maximum value of the preset torque range is smaller than the whole vehicle torque during normal upshift of the rear axle; the sum of the target torque of the front axle and the torque of the rear axle is larger than or equal to the current whole vehicle torque of the vehicle;

9. A vehicle comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 7 when the computer program is executed.

10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method according to any one of claims 1 to 7.