WO2022166499A1

WO2022166499A1 - Low-speed four-wheel drive mode control method and apparatus, storage medium, and electronic device

Info

Publication number: WO2022166499A1
Application number: PCT/CN2021/143784
Authority: WO
Inventors: 王建
Original assignee: 长城汽车股份有限公司
Priority date: 2021-02-03
Filing date: 2021-12-31
Publication date: 2022-08-11
Also published as: CN113911099B; CN113911099A

Abstract

A low-speed four-wheel drive (4L) mode control method and apparatus, a storage medium, and an electronic device, solving the technical problem that when a transfer case of a vehicle is in a 4L mode, a vehicle at a speed exceeding a set speed may resonate due to obvious steering and braking or roll over when making a turn, resulting in a safety accident. The method comprises: when a transfer case of a vehicle is in a 4L mode, obtaining a gear position signal of the vehicle (S101); when the vehicle is in reverse gear or drive gear, obtaining the vehicle speed (S102); when the vehicle speed is greater than a vehicle speed threshold, adjusting the transfer case from 4L hard lock to smart lock, and obtaining the angle of a steering wheel of the vehicle (S103); and controlling the transfer case to distribute torque of front and rear wheels of the vehicle according to the angle of the steering wheel (S104). By controlling the transfer case to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel, the resonance of the vehicle when the steering and braking is obvious and the rollover when the vehicle makes a turn are prevented, thus reducing the probability of safety accidents.

Description

Low-speed four-wheel drive mode control method, device, storage medium and electronic device

CROSS-REFERENCE TO RELATED APPLICATIONS

This disclosure claims the priority of a Chinese patent application with application number 202110152916.9 and titled "Low-speed four-wheel drive mode control method, device, storage medium and electronic device" filed with the China Patent Office on February 3, 2021, the entire contents of which are approved by References are incorporated in this disclosure.

technical field

The present disclosure relates to the technical field of vehicles, and in particular, to a low-speed four-wheel-drive mode control method, device, storage medium and electronic device.

Background technique

The transfer case is an important component of the automobile power system. Its main function is to distribute the power to the front and rear drive shafts, and transmit the torque to the wheels of the vehicle through the main reducer and drive shaft, thereby realizing four-wheel drive. The drive of the transfer case includes high-speed drive mode, low-speed drive mode and neutral mode (referred to as N gear). The high-speed drive mode includes four-wheel drive mode (referred to as 4WD mode) and high-speed two-wheel drive mode (referred to as 2H mode); Low-speed four-wheel drive mode (referred to as 4L mode); in N gear mode, the input shaft of the transfer case is disconnected from the output shaft. When the transfer case is in 4L mode, the transfer case will amplify the output torque of the transmission by more than 2.5 times, so that the front and rear axles can obtain greater input torque, so as to improve the dynamic performance of the vehicle, so that the vehicle can calmly face the non-paved road and Road conditions with complex terrain.

However, in the 4L mode of the transfer case, after the vehicle speed exceeds the set speed, the steering braking of the vehicle will obviously cause the vehicle to resonate or roll over when the vehicle turns, resulting in a safety accident; the vehicle performs reverse/forward staggered driving or steering When the torque is always in the loaded state, the primary friction group commutation and impact abnormal noise caused by the mechanical structure limit cause damage to the transfer case and the drive shaft, and the tires of the vehicle are seriously worn.

SUMMARY OF THE INVENTION

The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

Therefore, the first object of the present disclosure is to propose a low-speed four-wheel drive mode control method, so as to solve the problem of vehicle occurrence caused by the obvious steering braking of the vehicle after the vehicle speed exceeds the set vehicle speed when the transfer case of the vehicle is in the 4L mode. Resonance or the vehicle rolls over when turning, resulting in a technical problem of a safety accident.

The second objective of the present disclosure is to provide a low-speed four-wheel-drive mode control device.

In order to achieve the above purpose, the embodiment of the first aspect of the present disclosure proposes a low-speed four-wheel drive mode control method,

Applied to a vehicle, the method includes:

When the transfer case of the vehicle is in a low-speed four-wheel drive mode, acquiring a gear position signal of the vehicle;

Obtain the vehicle speed of the vehicle when the vehicle is in a reverse gear or a drive gear;

In the case that the vehicle speed is greater than the vehicle speed threshold, adjust the transfer case from the hard locking of the low-speed four-wheel drive mode to the intelligent locking, and obtain the angle of the steering wheel of the vehicle;

The transfer case is controlled to distribute torque to the front and rear wheels of the vehicle according to the angle of the steering wheel.

According to an embodiment of the present disclosure, the method further includes:

When the vehicle is in neutral, the transfer case is controlled to release torque for a preset period of time.

According to an embodiment of the present disclosure, the controlling of the transfer case to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel includes:

controlling the transfer case to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel, the angle of the steering wheel and the torque of the front wheels of the vehicle, wherein the angle of the steering wheel is inversely proportional to the torque of the front wheels of the vehicle .

According to an embodiment of the present disclosure, the transfer case of the vehicle is a switching condition for the low-speed four-wheel drive mode, including:

When the vehicle is in neutral and the vehicle speed is zero, the transfer case of the vehicle is switched to a low-speed four-wheel drive mode.

According to an embodiment of the present disclosure, when the vehicle speed is greater than a vehicle speed threshold, the method further includes: outputting alarm information to remind the driver to slow down.

According to an embodiment of the present disclosure, the outputting the alarm information includes: controlling an indicator light of an instrument of the vehicle to flash at a preset frequency; or,

The indicator lights of the instruments controlling the vehicle are illuminated in a preset color.

The embodiment of the first aspect of the present disclosure proposes a low-speed four-wheel drive mode control method. When the transfer case of the vehicle is in the low-speed four-wheel drive mode, the gear position information of the vehicle is obtained, and when the vehicle is in reverse gear or driving gear, the gear position information is obtained. The speed of the vehicle, when the vehicle speed is greater than the vehicle speed threshold, adjust the transfer case from the hard locking of the low-speed four-wheel drive mode to the intelligent locking, obtain the angle of the steering wheel of the vehicle, and control the transfer case to allocate the vehicle's speed according to the angle of the steering wheel. The torque of the front and rear wheels avoids the resonance of the vehicle when the steering and braking are obvious and the rollover when the vehicle turns, reducing the probability of safety accidents.

In order to achieve the above objective, a second aspect of the present disclosure provides a low-speed four-wheel drive mode control device, which is applied to a vehicle, and the device includes:

a first acquisition module configured to acquire a gear position signal of the vehicle when the transfer case of the vehicle is in a low-speed four-wheel drive mode;

a second obtaining module configured to obtain the vehicle speed of the vehicle when the vehicle is in a reverse gear or a drive gear;

a first execution module configured to adjust the transfer case from a hard lock to an intelligent lock in a low-speed four-wheel drive mode when the vehicle speed is greater than a vehicle speed threshold, and obtain the angle of the steering wheel of the vehicle ;

A second execution module is configured to control the transfer case to distribute torque to the front and rear wheels of the vehicle according to the angle of the steering wheel.

Optionally, the first execution module is further configured to control the transfer case to release torque within a preset time period when the vehicle is in neutral.

According to an embodiment of the present disclosure, the first execution module is further configured to control the transfer case to release torque within a preset time period when the vehicle is in neutral.

The embodiment of the second aspect of the present disclosure provides a low-speed four-wheel drive mode control device. When the transfer case of the vehicle is in the low-speed four-wheel drive mode, the gear position information of the vehicle is obtained, and when the vehicle is in the reverse gear or the drive gear, the gear information is obtained. The speed of the vehicle, when the vehicle speed is greater than the vehicle speed threshold, adjust the transfer case from the hard locking of the low-speed four-wheel drive mode to the intelligent locking, obtain the angle of the steering wheel of the vehicle, and control the transfer case to allocate the vehicle's speed according to the angle of the steering wheel. The torque of the front and rear wheels avoids the resonance of the vehicle when the steering and braking are obvious and the rollover when the vehicle turns, reducing the probability of safety accidents.

In order to achieve the above purpose, a third aspect of the present disclosure is a computing processing device, comprising:

a memory in which computer readable code is stored; and

One or more processors, when the computer readable code is executed by the one or more processors, the computing processing device executes the low-speed four-wheel drive mode control method proposed by the embodiment of the first aspect of the present disclosure.

In order to achieve the above object, a fourth aspect of the present disclosure provides a computer program, including computer-readable codes, which, when the computer-readable codes are executed on a computing and processing device, cause the computing and processing device to execute the first step of the present disclosure. On the one hand, the low-speed four-wheel drive mode control method proposed by the embodiment.

To achieve the above purpose, the fifth aspect of the present disclosure provides a computer-readable storage medium, in which the computer program provided by the fourth aspect of the present disclosure is stored.

Additional aspects and advantages of the present disclosure will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the present disclosure.

Description of drawings

The above and/or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

FIG. 1 provides a flowchart of a method for controlling a low-speed four-wheel drive mode according to an embodiment of the present disclosure;

FIG. 2 provides a control block diagram of a low-speed four-wheel drive mode control method according to an embodiment of the present disclosure;

FIG. 3 provides another flowchart of a method for controlling a low-speed four-wheel drive mode according to an embodiment of the present disclosure;

FIG. 4 provides a block diagram of a low-speed four-wheel drive mode control device according to an embodiment of the present disclosure;

FIG. 5 provides a schematic structural diagram of a computing processing device according to an embodiment of the present disclosure;

FIG. 6 provides a schematic diagram of a storage unit for portable or fixed program code implementing the method according to the present disclosure according to an embodiment of the present disclosure.

Detailed ways

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present disclosure and should not be construed as limiting the present disclosure.

Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this disclosure.

It should be noted that, in the present disclosure, the terms "S101", "S102" and the like in the description, the claims, and the drawings are used to distinguish steps, and are not necessarily interpreted as performing method steps in a specific order or sequence.

The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, but not to limit the present disclosure.

Before introducing the low-speed four-wheel drive mode control method, device, storage medium, and electronic device provided by the embodiments of the present disclosure, the application scenarios of the present disclosure are firstly introduced. The low-speed four-wheel drive mode control method of the present disclosure can be applied to vehicles.

The transfer case is an important component of the automobile power system. Its main function is to distribute the power to the front and rear drive shafts, and transmit the torque to the wheels of the vehicle through the main reducer and drive shaft, thereby realizing four-wheel drive. The transfer case of the vehicle includes high-speed driving mode, low-speed driving mode and neutral mode (referred to as N gear). The high-speed driving mode includes four-wheel drive mode (referred to as 4WD mode) and high-speed two-wheel drive mode (referred to as 2H mode); Low-speed four-wheel drive mode (referred to as 4L mode); in the N gear state, the input shaft of the transfer case is disconnected from the output shaft. When the vehicle is in 4L mode, the transfer case will amplify the output torque of the transmission by more than 2.5 times, so that the front and rear axles can obtain greater input torque, so as to improve the dynamic performance of the vehicle, so that when the transfer case of the vehicle is in 4L mode, the vehicle can Facing unpaved roads and road conditions with complex terrain calmly. When the vehicle is driving on relatively smooth road conditions, the transfer case is switched to the high-speed driving mode, which makes the vehicle have better fuel economy. Through the mode switching of the transfer case, the power and fuel economy of the vehicle under different road conditions can be improved.

However, when the classifier of the vehicle is in 4L mode, after the vehicle speed exceeds the set speed, the steering braking of the vehicle will obviously cause the vehicle to resonate or roll over when the vehicle turns, resulting in safety accidents; When turning, because the torque is always in the loaded state, the mechanical structure limit makes the primary friction group produce abnormal impact noise when reversing, resulting in damage to the transfer case and the drive shaft, and the tires of the vehicle are seriously worn.

In order to solve the above technical problems, the present disclosure provides a low-speed four-wheel drive mode control method. Taking the method applied to a vehicle as an example, FIG. 1 is a flowchart of a low-speed four-wheel drive mode control method according to an exemplary embodiment. As shown in Figure 1, the method includes the following steps.

In step S101, when the transfer case of the vehicle is in a low-speed four-wheel drive mode, a gear position signal of the vehicle is acquired.

In step S102, when the vehicle is in reverse gear or drive gear, the vehicle speed of the vehicle is acquired.

In step S103, when the vehicle speed is greater than the vehicle speed threshold, the transfer case is adjusted from the hard lock to the intelligent lock in the low-speed four-wheel drive mode, and the angle of the steering wheel of the vehicle is obtained.

In step S104, the transfer case is controlled to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel.

The vehicle speed threshold may be preset according to the vehicle speed during the actual operation of the vehicle, which is not specifically limited in the present disclosure.

In the low-speed four-wheel drive mode control method provided by the embodiment of the present disclosure, when the transfer case of the vehicle is in the low-speed four-wheel drive mode, the gear position information of the vehicle is obtained, when the vehicle is in reverse gear or the driving gear, the vehicle speed is obtained, and the When the vehicle speed is greater than the vehicle speed threshold, adjust the transfer case from hard locking in low-speed four-wheel drive mode to intelligent locking, obtain the angle of the steering wheel of the vehicle, and control the transfer case to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel. It avoids the resonance of the vehicle when the steering brake is obvious and the rollover when the vehicle turns, and reduces the probability of safety accidents. When the vehicle is in low-speed four-wheel drive mode and the vehicle is in neutral, the transfer case is controlled to release torque within a preset period of time to eliminate reverse/forward staggering or steering. Since the torque is always in a loaded state, the mechanical structure limit makes the When the primary friction group is reversed, the abnormal impact sound is generated, which avoids damage to the transfer case and drive shaft and reduces the degree of tire wear.

Specifically, as shown in Figure 2, the transfer case control unit obtains the 4L mode switch signal through the 4L mode switch, obtains the vehicle speed signal through the body electronic stability system, obtains the steering wheel angle signal through the combination switch assembly, and obtains the vehicle through the gearbox. The gear position signal, and then control the transfer case, and interact with the vehicle's instrumentation.

Optionally, in step S101, the switching condition for the transfer case of the vehicle to be the low-speed four-wheel drive mode may include:

When the vehicle is in neutral and the vehicle speed is zero, the transfer case of the vehicle is switched to the low-speed four-wheel drive mode.

Specifically, the cut-in and cut-out of the low-speed four-wheel drive mode of the transfer case (hereinafter referred to as the 4L mode) is mainly realized by the planetary gear train, the coupling sleeve, and the shifting motor. When the transfer case is in high-speed mode, the torque from the gearbox is transmitted to the transfer case input shaft, the high-low gear combination sleeve, and the rear output shaft. When the transfer case is in 4L mode, the torque from the gearbox is transmitted to the transfer case input shaft, sun gear, planetary gear, planet carrier, high and low gear combination sleeve, and rear output shaft, and the torque is amplified.

Specifically, in step S102, when the vehicle is in reverse gear, step on the accelerator pedal to reverse, the driving wheel drives the driven wheel to rotate, and the torque is transmitted in reverse; when the vehicle is in the driving gear, step on the accelerator pedal to move forward, and the driving wheel drives the slave The driving wheel rotates, and the torque is transmitted in the positive direction. When the vehicle's speed in 4L mode exceeds the vehicle speed threshold, the vehicle will resonate, resulting in traffic accidents.

When the transfer case is in the hard lock (hereinafter referred to as Lock) state in the 4L mode, the torque to the front and rear wheels of the vehicle is distributed 1:1; when the transfer case is in the intelligent lock (hereinafter referred to as Auto) state in the 4L mode, An intelligent distribution of torque to the front and rear wheels of the vehicle can be achieved.

Optionally, in step S103, when the vehicle speed is greater than the vehicle speed threshold, the method may further include: outputting alarm information to remind the driver to slow down.

For example, when the transfer case of the vehicle is in 4LAuto mode and the vehicle speed is greater than 40Km/h, an alarm message is output to remind the driver to slow down to avoid safety accidents.

Optionally, outputting the alarm information may include: the indicator light of the instrument controlling the vehicle flashes at a preset frequency; or,

The indicator lights of the instruments that control the vehicle light up in a preset color.

The preset frequency may be preset according to the actual driving light alarm, which is not specifically limited in the present disclosure.

For example, when the transfer case of the vehicle is in 4LAuto mode and the vehicle speed is greater than 40Km/h, the indicator light of the instrument that controls the vehicle flashes at a frequency of 3 times/second; or the indicator light of the instrument panel that controls the vehicle is Bright orange. Thereby reminding the driver to slow down to avoid safety accidents.

Optionally, in step S104, controlling the transfer case to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel may include:

The control transfer case distributes the torque to the front and rear wheels of the vehicle according to a predetermined relationship between the angle of the steering wheel and the torque of the front wheels of the vehicle, wherein the angle of the steering wheel is inversely proportional to the torque of the front wheels of the vehicle.

Specifically, the control transfer case reduces the torque distributed to the front wheels of the vehicle according to the angle of the steering wheel, the inverse relationship between the angle of the steering wheel and the torque of the front wheels of the vehicle, and increases the reduced torque to the rear wheels of the vehicle .

For example, when the transfer case of the vehicle is in 4LAuto mode and the vehicle speed is greater than 40Km/h, when the steering wheel angle is 0°, the transfer case distributes 90% of the torque to the front wheels of the vehicle, and the rest of the torque is distributed to the vehicle's front wheels. Rear wheels; when the steering wheel angle is 90°, the transfer case distributes 45% of the torque to the front wheels of the vehicle, and the rest of the torque is distributed to the rear wheels of the vehicle; when the steering wheel angle is 180°, the transfer case distributes to the front wheels of the vehicle 25% of the torque is distributed to the rear wheels of the vehicle; when the steering wheel angle is 170°, the transfer case distributes 10% of the torque to the front wheels of the vehicle, and the rest of the torque is distributed to the rear wheels of the vehicle. Realize the differential speed between axles, reduce the steering braking of the vehicle and the risk of rollover.

After the vehicle's four-wheel drive control unit collects the engine accelerator opening signal, engine speed signal and four-wheel speed and other signals, it determines whether the vehicle is slipping or whether the vehicle is turning, and then sends a command to TOD (Torque-On-Demand, torque on demand four drive) solenoid coil. The electromagnetic coil generates different electromagnetic forces according to the magnitude of the current. The electromagnetic force controls the adsorption force between the electromagnetic coil and the pressure plate, and is transmitted to the wet friction plate mechanism through the pressure amplifier to control the tightness of the friction plate to transmit torque and control the torque. the size of. The transmitted and controllable torque is transmitted to the front drive shaft and the front drive axle through the sprocket chain.

When the coil is energized, the rotor and the armature are attracted, and the resistance is transmitted to the rotor by the driving sprocket on the vehicle through the second-stage wet friction plate group shell and the armature, so that the rotor is decelerated instantly, and the driven wheel on the vehicle rotates relative to the driving wheel, from The inclined tapered surface of the driving wheel pushes the steel ball and the ball cam driving wheel, so that the driving wheel moves axially, the ball cam driving wheel pushes the pressure plate, the pressure plate presses the friction plate assembly, drives the driving sprocket, and enters the four-wheel drive state, and the power is driven by the friction plate. The group is passed to the driving sprocket to realize front-wheel drive.

When the vehicle is reversing/forward staggered driving or steering, since the torque is always in the loaded state, the primary friction group reversing impact and abnormal noise caused by the limitation of the mechanical structure will cause damage to the transfer case and drive shaft, and the tires of the vehicle are severely worn.

Optionally, the method may further include: when the vehicle is in neutral gear, controlling the transfer case to release torque within a preset time period.

Wherein, the preset duration may be preset according to the magnitude of the torque in the actual operation of the vehicle, which is not specifically limited in the present disclosure.

For example, when the transfer case of the vehicle is in 4LLock mode and the current of the transfer case solenoid coil is loaded to the maximum, when the vehicle is in neutral gear, the release current of the transfer case solenoid coil is controlled for 1s to 3s to realize the release of the transfer case. Torque, eliminates the abnormal sound of the main and driven wheels caused by the mechanical structure, avoids the damage of the transfer case and the drive shaft, and reduces the tire wear of the vehicle.

For example, as shown in Figure 3, obtain the 4L mode switch signal, vehicle speed signal, steering wheel angle signal and gear position signal, and judge whether the transfer case meets the 4L mode according to the 4L mode switch signal, vehicle speed signal, steering wheel angle signal and gear position signal. switching conditions.

In the case that the transfer case meets the switching conditions of the 4L mode, the transfer case is controlled to switch to the 4LLock mode to determine whether the vehicle is in the D/R gear and the vehicle speed is greater than zero; in the case that the transfer case does not meet the switching conditions of the 4L mode Under the 4L switching conditions, the driver is reminded through the vehicle's instrumentation that the 4L switching conditions are not met.

When the vehicle is in the D/R gear and the vehicle speed is greater than zero, the transfer case solenoid current is loaded to the maximum, the gearbox detects the vehicle gear and judges whether the vehicle is in neutral; when the vehicle is not in the D/R gear, the vehicle speed is obtained. Less than or equal to zero, the transfer case solenoid is not loaded with current.

When the vehicle is in neutral gear, the transfer case solenoid releases current for 1s to 3s; when the vehicle is not in neutral gear, the current load of the transfer case solenoid coil remains unchanged to determine whether the vehicle speed is greater than the vehicle speed threshold.

When the vehicle speed is greater than the vehicle speed threshold, adjust the transfer case from 4LLock to 4LAuto, control the transfer case to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel, and control the indicator light of the instrument of the vehicle to flash at a preset frequency ; Or, the indicator light of the instrument that controls the vehicle lights up with a preset color; when the vehicle speed is less than or equal to the vehicle speed threshold, the control transfer case maintains the torque distribution in the 4LLock mode.

In order to implement the above embodiments, the present disclosure also proposes a low-speed four-wheel drive mode control device. As shown in FIG. 4 , the low-speed four-wheel drive mode control device 1300 includes a first acquisition module 1301 , a second acquisition module 1302 , and a first execution module 1303 and the second execution module 1304.

Wherein, the first obtaining module 1301 is configured to obtain the gear position signal of the vehicle when the transfer case of the vehicle is in the low-speed four-wheel drive mode;

The second obtaining module 1302 is configured to obtain the vehicle speed of the vehicle when the vehicle is in a reverse gear or a drive gear;

The first execution module 1303 is configured to adjust the transfer case from hard locking to intelligent locking in the low-speed four-wheel drive mode, and obtain the angle of the steering wheel of the vehicle when the vehicle speed is greater than the vehicle speed threshold;

The second actuation module 1304 is configured to control the transfer case to distribute torque to the front and rear wheels of the vehicle according to the angle of the steering wheel.

The low-speed four-wheel drive mode control device provided by the embodiment of the present disclosure acquires the gear position information of the vehicle when the transfer case of the vehicle is in the low-speed four-wheel drive mode, acquires the vehicle speed when the vehicle is in reverse gear or drive gear, and When the vehicle speed is greater than the vehicle speed threshold, adjust the transfer case from hard locking in low-speed four-wheel drive mode to intelligent locking, obtain the angle of the steering wheel of the vehicle, and control the transfer case to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel. It avoids the resonance of the vehicle when the steering brake is obvious and the rollover when the vehicle turns, and reduces the probability of safety accidents. When the vehicle is in low-speed four-wheel drive mode and the vehicle is in neutral, the transfer case is controlled to release torque within a preset period of time to eliminate reverse/forward staggering or steering. Since the torque is always in a loaded state, the mechanical structure limit makes the When the primary friction group is reversed, the abnormal impact sound is generated, which avoids damage to the transfer case and drive shaft and reduces the degree of tire wear.

Optionally, the first obtaining module 1301 is further configured to switch the transfer case of the vehicle to the low-speed four-wheel drive mode when the vehicle is in neutral gear and the vehicle speed is zero.

Optionally, the first execution module 1303 is configured to output alarm information to remind the driver to slow down when the vehicle speed is greater than the vehicle speed threshold.

Optionally, the first execution module 1303 is configured to control the indicator light of the instrument of the vehicle to flash at a preset frequency; or,

Optionally, the second execution module 1304 is configured to control the transfer case to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel, the angle of the steering wheel and the torque of the front wheels of the vehicle, wherein the angle of the steering wheel and the torque of the front wheels of the vehicle are The torque to the front wheels of the vehicle is inversely proportional.

Optionally, the second acquisition module 1302 is configured to control the transfer case to release torque within a preset time period when the vehicle is in neutral.

In addition, it is worth noting that, for the convenience and brevity of description, the embodiments described in the specification are all preferred embodiments, and the parts involved are not necessarily necessary for the present invention, for example, the first execution module and the second The execution modules may be mutually independent devices or the same device during specific implementation, which is not limited in the present disclosure.

Regarding the apparatus in the above-mentioned embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

In order to realize the above embodiments, the present disclosure also proposes a computing processing device, including:

a memory in which computer readable code is stored; and

One or more processors, when the computer readable code is executed by the one or more processors, the computing processing device executes the aforementioned low-speed four-wheel drive mode control method.

In order to implement the above-mentioned embodiments, the present disclosure also proposes a computer program, comprising computer-readable codes, when the computer-readable codes are executed on a computing processing device, causing the computing processing device to execute the aforementioned low-speed four-wheel drive mode Control Method.

In order to implement the above-mentioned embodiments, the present disclosure also proposes a computer-readable storage medium in which the aforementioned computer program is stored.

FIG. 5 provides a schematic structural diagram of a computing processing device according to an embodiment of the present disclosure. The computing processing device typically includes a processor 1110 and a computer program product or computer readable medium in the form of a memory 1130 . The memory 1130 may be electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM. The memory 1130 has storage space 1150 for program code 1151 for performing any of the method steps in the above-described methods. For example, the storage space 1150 for program codes may include various program codes 1151 for implementing various steps in the above methods, respectively. The program codes can be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. Such computer program products are typically portable or fixed storage units as shown in FIG. 6 . The storage unit may have storage segments, storage spaces, etc. arranged similarly to the storage 1130 in the server of FIG. 5 . The program code may, for example, be compressed in a suitable form. Typically, the storage unit includes computer readable code 1151', i.e. code readable by a processor such as 1110, for example, which when executed by a server, causes the server to perform the various steps in the methods described above.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structures, materials, or features are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed 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, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless expressly and specifically defined otherwise.

Any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing custom logical functions or steps of the process , and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which the functions may be performed out of the order shown or discussed, including performing the functions substantially concurrently or in the reverse order depending upon the functions involved, which should It is understood by those skilled in the art to which the embodiments of the present disclosure pertain.

The logic and/or steps represented in flowcharts or otherwise described herein, for example, may be considered an ordered listing of executable instructions for implementing the logical functions, may be embodied in any computer-readable medium, For use with, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from and execute instructions from an instruction execution system, apparatus, or apparatus) or equipment. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or apparatus. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections with one or more wiring (electronic devices), portable computer disk cartridges (magnetic devices), random access memory (RAM), Read Only Memory (ROM), Erasable Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program may be printed, as the paper or other medium may be optically scanned, for example, followed by editing, interpretation, or other suitable medium as necessary process to obtain the program electronically and then store it in computer memory.

It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented by any one of the following techniques known in the art, or a combination thereof: discrete with logic gates for implementing logic functions on data signals Logic circuits, application specific integrated circuits with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the program is stored in a computer-readable storage medium. When executed, one or a combination of the steps of the method embodiment is included.

In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, and the like. Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limitations of the present disclosure, and those of ordinary skill in the art may interpret the above-described embodiments within the scope of the present disclosure. Embodiments are subject to variations, modifications, substitutions and variations.

Claims

A low-speed four-wheel drive mode control method, characterized in that, applied to a vehicle, the method comprising:

When the transfer case of the vehicle is in a low-speed four-wheel drive mode, acquiring a gear position signal of the vehicle;

Obtain the vehicle speed of the vehicle when the vehicle is in a reverse gear or a drive gear;

In the case that the vehicle speed is greater than the vehicle speed threshold, adjusting the transfer case from the hard locking of the low-speed four-wheel drive mode to the intelligent locking, and obtaining the angle of the steering wheel of the vehicle;

The transfer case is controlled to distribute torque to the front and rear wheels of the vehicle according to the angle of the steering wheel.
The method according to claim 1, wherein the method further comprises:

When the vehicle is in neutral, the transfer case is controlled to release torque for a preset period of time.
The method of claim 1, wherein the controlling the transfer case to distribute the torque to the front and rear wheels of the vehicle according to the angle of the steering wheel comprises:

controlling the transfer case to distribute the torque of the front and rear wheels of the vehicle according to the angle of the steering wheel, the angle of the steering wheel and the torque of the front wheels of the vehicle, wherein the angle of the steering wheel is inversely proportional to the torque of the front wheels of the vehicle .
The method according to claim 1, wherein the transfer case of the vehicle is a switching condition for a low-speed four-wheel drive mode, comprising:

When the vehicle is in neutral and the vehicle speed is zero, the transfer case of the vehicle is switched to a low-speed four-wheel drive mode.
The method according to claim 1, wherein when the vehicle speed is greater than a vehicle speed threshold, the method further comprises: outputting alarm information to remind the driver to slow down.
The method according to claim 5, wherein the outputting alarm information comprises: controlling an indicator light of an instrument of the vehicle to flash at a preset frequency; or,

The indicator lights of the instruments controlling the vehicle are illuminated in a preset color.
A low-speed four-wheel drive mode control device, characterized in that, when applied to a vehicle, the device comprises:

a first obtaining module, configured to obtain a gear position signal of the vehicle when the transfer case of the vehicle is in a low-speed four-wheel drive mode;

a second obtaining module configured to obtain the vehicle speed of the vehicle when the vehicle is in a reverse gear or a drive gear;

a first execution module, configured to adjust the transfer case from a hard lock to an intelligent lock in a low-speed four-wheel drive mode when the vehicle speed is greater than a vehicle speed threshold, and obtain the angle of the steering wheel of the vehicle ;

A second actuation module is configured to control the transfer case to distribute torque to the front and rear wheels of the vehicle according to the angle of the steering wheel.
7. The apparatus of claim 7, wherein the first actuation module is further configured to control the transfer case to release torque within a preset time period when the vehicle is in neutral.
A computing and processing device, comprising:

a memory on which a computer program is stored;

A processor, configured to execute the computer program in the memory, to implement the steps of the low-speed four-wheel drive mode control method according to any one of claims 1-6.
A computer program comprising computer readable code which, when executed on a computing processing device, causes the computing processing device to perform the low speed four-wheel drive mode of any one of claims 1-6 Control Method.
A computer-readable storage medium in which the computer program of claim 10 is stored.