CN115570916A - Tire underpressure identification method and device, storage medium and vehicle control unit - Google Patents

Tire underpressure identification method and device, storage medium and vehicle control unit Download PDF

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Publication number
CN115570916A
CN115570916A CN202110687598.6A CN202110687598A CN115570916A CN 115570916 A CN115570916 A CN 115570916A CN 202110687598 A CN202110687598 A CN 202110687598A CN 115570916 A CN115570916 A CN 115570916A
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wheel
vehicle
wheel diameter
under
tire
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王冠文
覃广坦
廖银生
张宏洲
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BYD Co Ltd
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BYD Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/06—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle
    • B60C23/061—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle by monitoring wheel speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The invention discloses a tire under-voltage identification method and device, a storage medium and a vehicle control unit. The tire underpressure identification method comprises the following steps: acquiring a wheel speed signal, vehicle steering information and a vehicle speed of each wheel; determining the wheel speed pulse number of each wheel in preset time according to the wheel speed signal of each wheel, and determining the wheel diameter parameter of each wheel according to the wheel speed pulse number of each wheel in the preset time; determining the current running condition of the vehicle according to the vehicle steering information; and performing under-voltage identification on each wheel according to the current running condition of the vehicle and the wheel diameter parameter of each wheel. The tire underpressure identification method can accurately identify the tire pressure state of each wheel at low cost.

Description

Tire underpressure identification method and device, storage medium and vehicle control unit
Technical Field
The invention relates to the technical field of vehicles, in particular to a tire under-pressure identification method and device, a storage medium and a vehicle control unit.
Background
In the related art, there are two detection methods for the tire pressure of a vehicle tire, the first is to install a corresponding sensor on the vehicle tire to acquire information such as the air pressure and temperature of the wheel, and then to judge whether the tire pressure of the wheel is abnormal according to the acquired information; the second method is to collect the state information of the vehicle during operation, and then to determine whether the tire pressure of the wheel is abnormal or not by combining the wheel parameters known in advance, such as the rotation radius of the wheel. However, with the first detection method, it can only be determined whether the tire pressure of the wheel is abnormal under a simpler working condition, such as when the vehicle is stationary, and additional equipment needs to be installed, which is costly; with the second detection method described above, although it is possible to perform the determination under relatively complicated conditions such as steering, it is only possible to determine whether there is an abnormality in the wheels, and it is not possible to specifically determine which tire of the vehicle has an abnormality.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide a tire underpressure identification method, which can accurately determine the tire pressure state of each wheel with low cost.
A second object of the invention is to propose a computer-readable storage medium.
The third purpose of the invention is to provide a vehicle control unit.
The fourth purpose of the invention is to provide an under-pressure tire identification device.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a tire underpressure identification method, including: acquiring a wheel speed signal, vehicle steering information and a vehicle speed of each wheel; determining the wheel speed pulse number of each wheel within preset time according to the wheel speed signal of each wheel, and determining the wheel diameter parameter of each wheel according to the wheel speed pulse number of each wheel within preset time; determining the current running condition of the vehicle according to the vehicle steering information; and performing under-pressure identification on each wheel according to the current running condition of the vehicle and the wheel diameter parameter of each wheel.
In order to achieve the above object, a second aspect of the present invention provides a computer readable storage medium, on which a tire under-pressure identification program is stored, where the tire under-pressure identification program is executed by a processor to implement the tire under-pressure identification method.
In order to achieve the above object, a vehicle control unit according to a third aspect of the present invention includes a memory, a processor, and a tire under-pressure identification program stored in the memory and operable on the processor, where the processor implements the tire under-pressure identification method when executing the tire under-pressure identification program.
In order to achieve the above object, a fourth aspect of the present invention provides an under-pressure tire identification device, including: the acquisition module is used for acquiring a wheel speed signal, vehicle steering information and a vehicle speed of each wheel; the first determining module is used for determining the wheel speed pulse number of each wheel in preset time according to the wheel speed signal of each wheel, and determining the wheel diameter parameter of each wheel according to the wheel speed pulse number of each wheel in the preset time; the second determining module is used for determining the current running working condition of the vehicle according to the vehicle steering information; and the identification module is used for carrying out under-voltage identification on each wheel according to the current running condition of the vehicle and the wheel diameter parameter of each wheel.
According to the tire under-pressure identification method, the tire under-pressure identification device, the storage medium and the vehicle control unit, the wheel speed signal, the vehicle steering information and the vehicle speed of each wheel are obtained, the wheel speed pulse number of each wheel in the preset time is determined according to the wheel speed signal of each wheel, and the wheel diameter parameter of each wheel is determined according to the wheel speed pulse number of each wheel in the preset time, so that under-pressure identification is performed by using the wheel diameter parameter of each wheel, and under-pressure identification of each tire with lower cost is realized; furthermore, the current running condition of the vehicle is determined according to the vehicle steering information, and then under-voltage identification is carried out on each wheel according to the current running condition of the vehicle and the wheel diameter parameter of each wheel, so that the wheel diameter parameter is corrected according to the current running condition of the vehicle, and more accurate under-voltage identification is realized. Thereby, it is possible to realize accurate recognition of the tire pressure state of each wheel at a low cost.
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.
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FIG. 1 is a flow chart of a method of identifying underpressure in a tire according to one embodiment of the present invention;
FIG. 2 is a flow chart of an example under-pressure tire identification method of the present invention;
FIG. 3 is a diagram of a second predetermined scaling factor according to an example of the present invention;
fig. 4 is a block diagram showing the structure of the tire underpressure recognition apparatus according to the embodiment of the present invention.
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 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 drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a tire underpressure identification method, device, storage medium, and vehicle control unit according to an embodiment of the present invention with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method of identifying underpressure in a tire according to one embodiment of the present invention.
As shown in fig. 1, the under-pressure tire identification method includes the following steps:
and S11, acquiring a wheel speed signal, vehicle steering information and a vehicle speed of each wheel.
Specifically, the wheel speed signal, the vehicle steering information, and the vehicle speed of each wheel described above may be acquired in a preset manner.
As an example, for the wheel speed signal of each wheel, a special wheel speed sensor may be installed on each wheel, so as to obtain the wheel speed signal of each wheel; alternatively, the wheel speed signal of each wheel may be obtained by using ABS (Anti-lock Braking System) and/or EPS (Electric Power Steering). Specifically, the wheel speed sensor mounted on the wheel may be used to obtain a wheel speed pulse signal of each wheel, or the ABS and/or the EPS may be used to obtain a wheel speed pulse signal of each wheel, so as to obtain a wheel speed signal of each wheel according to the wheel speed pulse signal.
For the vehicle steering information, the steering angle and/or yaw rate of the vehicle can be obtained by using the ABS and/or the EPS, and then the vehicle steering information can be obtained according to the steering angle and/or yaw rate of the vehicle.
For the vehicle speed, a vehicle speed sensor can be arranged at a preset position of the vehicle, and the vehicle speed of the vehicle is obtained according to the vehicle speed sensor; alternatively, the vehicle speed may also be obtained using the EPS and/or ABS.
S12, determining the wheel speed pulse number of each wheel within the preset time according to the wheel speed signal of each wheel, and determining the wheel diameter parameter of each wheel according to the wheel speed pulse number of each wheel within the preset time.
Specifically, determining the maximum pulse number or the minimum pulse number according to the wheel speed pulse number of each wheel in a preset time; and calculating the wheel diameter parameter of each wheel according to the maximum pulse number or the minimum pulse number and the wheel speed pulse number of each wheel in a preset time.
The wheel speed pulse number is the number of wheel speed pulse signals accumulated in a preset time, and the wheel diameter parameter of each wheel can be calculated according to the following formula:
r j ＝N 0 (1/N j -1/N 0 )
wherein r is j Representing the wheel diameter parameter, N, of each wheel 0 Indicating the maximum or minimum number of pulses, N j The number of wheel speed pulses of each wheel in a preset time is shown.
And S13, determining the current running condition of the vehicle according to the vehicle steering information.
Specifically, the current driving condition of the vehicle can be obtained according to the vehicle steering information. For example, the steering angle and/or yaw rate of the vehicle may be obtained through the vehicle steering information, and the current operating condition of the vehicle may be obtained according to the steering angle and/or yaw rate of the vehicle.
And S14, performing under-voltage identification on each wheel according to the current running condition of the vehicle and the wheel diameter parameter of each wheel.
Specifically, when the current running condition of the vehicle is a steering condition, the first wheel diameter correction amount is determined according to the vehicle steering information and the vehicle speed. The manner of obtaining the first wheel diameter correction amount according to the vehicle steering information and the vehicle speed may be a preset manner; for example, when the vehicle steering information includes a yaw rate, the first wheel diameter correction amount may be obtained by referring to a preset table, or may be calculated according to the following formula:
Figure BDA0003125324860000041
wherein dr is 1 Indicates the first wheel diameter correction amount, v indicates the vehicle speed, D indicates the wheel track, W z Indicating the yaw rate.
Alternatively, when the vehicle steering information is a steering angle, the first wheel diameter correction amount may be obtained by querying a preset steering angle-first wheel diameter correction amount correspondence table.
Further, when the steering condition is a right steering condition, because the speed of the left side of the vehicle is higher than the speed of the right side of the vehicle, the wheel diameter parameters corresponding to the wheels on the left side of the vehicle may deviate, so the first wheel diameter correction amount may be adopted to correct the wheel diameter parameters of the two wheels on the left side of the vehicle, perform under-pressure identification on the two wheels on the left side of the vehicle according to the corrected wheel diameter parameters, and perform under-pressure identification on the two wheels on the right side of the vehicle according to the wheel diameter parameters of the two wheels on the right side of the vehicle; when the steering condition is a left steering condition, because the speed of the right side of the vehicle is higher than that of the left side of the vehicle, the wheel diameter parameters corresponding to the wheels on the right side of the vehicle are deviated, so that the wheel diameter parameters of the two wheels on the right side of the vehicle can be corrected by adopting the first wheel diameter correction quantity, the two wheels on the right side of the vehicle are subjected to under-pressure identification according to the corrected wheel diameter parameters, and the two wheels on the left side of the vehicle are subjected to under-pressure identification according to the wheel diameter parameters of the two wheels on the left side of the vehicle.
Specifically, the wheel diameter parameter of the wheel and the first wheel diameter correction amount may be added to obtain a corrected wheel diameter parameter, that is, if it is determined that the vehicle is turning to the left according to the vehicle steering information, the first wheel diameter correction amount corresponding to the right wheel of the vehicle is made to be the calculated first wheel diameter correction amount, the first wheel diameter correction amount corresponding to the left wheel of the vehicle is made to be zero, and the wheel diameter parameter of the vehicle and the corresponding first wheel diameter correction amount are added; if it is determined that the vehicle is turning to the right based on the vehicle steering information, the first wheel diameter correction amount corresponding to the left wheel of the vehicle is made the calculated first wheel diameter correction amount, the first wheel diameter correction amount corresponding to the right wheel of the vehicle is made zero, and the wheel diameter parameter of the vehicle and the corresponding first wheel diameter correction amount are added.
And if the current steering working condition of the vehicle is determined according to the vehicle steering information, obtaining the wheel diameter parameter of each wheel obtained by correcting the first wheel diameter correction quantity. And then the corrected wheel diameter parameter of each wheel can be compared with a preset threshold value, if the wheel diameter parameter of one wheel is lower than the preset threshold value, the wheel under-pressure is judged, and then the vehicle sends an alarm signal to a user. The preset threshold may be, for example, 75% of the national under-voltage standard; or a threshold value set according to the vehicle speed; or, the vehicle speed setting threshold value can be used in the straight-driving working condition, and the national under-voltage standard is 75% in the steering working condition.
It should be noted that, when the current running condition of the vehicle is a straight running condition, the under-pressure identification is performed on the corresponding wheel according to the wheel diameter parameter of each wheel. The wheel diameter parameter of each wheel can be compared with a preset threshold value, if the wheel diameter parameter of one wheel is lower than the preset threshold value, the wheel is judged to be under-pressure, and then the vehicle sends an alarm signal to a user. The preset threshold may be, for example, 75% of the national undervoltage standard; or a threshold value set according to the vehicle speed; or, the vehicle speed setting threshold value can be used in the straight-driving working condition, and the national under-voltage standard is 75% in the steering working condition.
From this, can realize all can judging the wheel under the operating mode of turning to and the straight line operating mode whether under every wheel of vehicle is undervoltage. And the wheel diameter parameter is corrected by using the first wheel diameter correction quantity under the turning working condition, so that the wheel state is more accurately judged.
The method for identifying under-pressure tire according to the embodiment of the present invention will be described in detail with reference to the specific example shown in fig. 2.
Referring to fig. 2, firstly, the wheel speed pulse number N accumulated in a certain time is obtained according to the EPS and the ABS, and then the wheel diameter parameter r of each wheel is obtained according to the wheel speed pulse number. Obtaining a steering angle a of the vehicle according to the vehicle steering information, and if a =0, judging that the vehicle is in a straight-driving working condition; if a is not 0, the vehicle is in a turning condition. And if the vehicle is in a straight running working condition, judging that the wheel diameter parameter R of each wheel is the wheel diameter correction parameter R of each wheel, wherein the wheel diameter correction parameter R is the corrected wheel diameter parameter. If the vehicle is in a steering condition, a wheel diameter correction dr is obtained according to the steering angle a and the vehicle speed v, and the wheel diameter correction dr comprises a first wheel diameter correction amount. Judging the relationship between the wheel diameter correction parameter R of each wheel and a preset threshold value S, and if the wheel diameter correction parameter R of one wheel is smaller than the preset threshold value S, judging that the tire pressure of the wheel is abnormal; and if the wheel diameter correction parameter R of one wheel is larger than or equal to the preset threshold value S, judging that the tire pressure of the wheel is normal.
In one embodiment of the present invention, when the front-rear load difference of the vehicle is large, the load of the vehicle affects the shape of the wheel, and further affects the wheel diameter parameter of the wheel. Therefore, before the wheel is subjected to under-pressure identification, the front-rear load difference of the vehicle can be determined; when the front and rear load difference is larger than the preset load, determining a second wheel diameter correction amount according to the front and rear load difference; and correcting the wheel diameter parameter corresponding to the wheel with large load according to the second wheel diameter correction quantity.
Specifically, the second wheel diameter correction amount is calculated according to the following equation:
dr 2 ＝k 2 Δm
wherein dr 2 Is the second wheel diameter correction amount, k 2 And is a second preset proportionality coefficient, and the delta m is the front-rear load difference. The second predetermined scaling factor may be measured by a predetermined methodObtaining; for example, the front-rear load difference = rear axle load — front axle load, if the front-rear load difference is a negative value, it indicates that the front axle load is greater, and if the front-rear load difference is a positive value, it indicates that the rear bearing is heavier, and further, a load of a certain mass may be loaded at the vehicle rear axle position in advance, and since there is no load at the front axle of the vehicle, the mass of the load is the front-rear load difference Δ m, and the front wheel diameter parameter r of the vehicle may be recorded when the vehicle is running at a constant speed F And rear wheel diameter parameter r R Obtaining a second wheel diameter correction dr according to the wheel diameter parameters of the front wheel and the rear wheel 2 ＝r F -r R Further, the loaded load is continuously changed, a second wheel diameter correction amount corresponding to the loaded load is measured, a straight line is obtained through fitting according to the corresponding relation between the measured second wheel diameter correction amount and the loaded load, and a second preset proportion coefficient is obtained according to the straight line as shown in fig. 3; alternatively, a correspondence table between the second wheel diameter correction amount and the loaded load may be obtained in advance, and the second wheel diameter correction amount may be obtained by looking up the table.
Further, when the vehicle is accelerated or braked, the wheels slip on the ground, and the wheel diameter parameters are affected. Thus, before the wheel is identified as being under-voltage, the current driving force or braking force of the vehicle can be determined when the vehicle is determined to be running in an accelerating mode or braking mode; and determining a third wheel diameter correction amount according to the current driving force or braking force of the vehicle, and correcting the wheel diameter parameter corresponding to each wheel according to the third wheel diameter correction amount.
Specifically, the third radius correction amount is calculated according to the following formula:
dr 3 ＝k 3 F
wherein dr is 3 As a third radius correction amount, k 3 F is the current driving force or braking force of the vehicle. The third wheel diameter correction amount may be obtained by calculating a difference between a wheel diameter parameter of a non-driving wheel of the vehicle and a wheel diameter parameter of a driving wheel in advance, and the driving force or the braking force of the vehicle may be synchronously obtained, and the third preset proportionality coefficient may be obtained by a least square method.
Further, the wheel diameter parameters of the wheel are also affected due to individual differences of the tires and aging and wear of the tires. Therefore, before the under-pressure identification is carried out on the wheels, the fourth wheel diameter correction quantity corresponding to each wheel can be obtained, and the wheel diameter parameters corresponding to the corresponding wheels are corrected according to the fourth wheel diameter correction quantity corresponding to each wheel. Specifically, after each maintenance of the vehicle, a wheel diameter parameter when the tire pressure of each wheel is normal may be obtained, and the maximum wheel diameter parameter may be determined according to the wheel diameter parameter when the tire pressure of each wheel is normal; determining fourth wheel diameter correction quantity corresponding to each wheel according to the maximum wheel diameter parameter and the wheel diameter parameter when the tire pressure of each wheel is normal; and correcting the wheel diameter parameters corresponding to the corresponding wheels according to the fourth wheel diameter correction quantity corresponding to each wheel. For example, the fourth wheel diameter correction amount for each wheel may be made equal to the difference between the maximum wheel diameter parameter and the wheel diameter parameter at the time when the tire pressure of each wheel is normal.
Thus, if the vehicle is in a straight-ahead driving condition, the corrected wheel diameter parameter of each wheel = the wheel diameter parameter of each wheel + the second wheel diameter correction amount + the third wheel diameter correction amount + the fourth wheel diameter correction amount; and if the vehicle is in a steering working condition, the corrected wheel diameter parameter of each wheel = the wheel diameter parameter of each wheel + the first wheel diameter correction amount + the second wheel diameter correction amount + the third wheel diameter correction amount + the fourth wheel diameter correction amount. And then can utilize this wheel diameter parameter after revising to carry out the under-voltage discernment to the wheel, realize higher discernment precision.
In summary, according to the tire under-pressure identification method provided by the embodiment of the invention, the wheel diameter parameter of each wheel is calculated according to the number of the wheel speed pulse signals by acquiring the wheel speed pulse signals of each wheel, and the tire pressure condition of each wheel is judged by using the wheel diameter parameter calculated according to the wheel speed pulse signals, so that the judgment can be carried out under the straight-ahead working condition and the turning working condition, and the cost is low. When the vehicle is in a straight-ahead working condition, judging the tire pressure condition of the wheels according to the wheel diameter parameters of each wheel; and if the vehicle is in a turning working condition, correcting the wheel diameter parameter of each wheel, thereby eliminating the influence of turning on the wheel diameter parameter and realizing accurate judgment on the tire pressure condition of each wheel. And various factors influencing the wheel diameter parameters are comprehensively considered, and the wheel diameter parameters are compensated to eliminate the influence of the factors on the wheel diameter parameters, so that the accuracy of judging the tire pressure conditions of the wheels is further improved.
Further, the present invention proposes a computer-readable storage medium.
In an embodiment of the present invention, a computer-readable storage medium stores a tire underpressure identification program, and the tire underpressure identification program is executed by a processor to implement the tire underpressure identification method.
The computer readable storage medium of the embodiment of the invention can acquire the wheel speed pulse signal of each wheel when the computer program on the computer readable storage medium is executed by the processor, and further calculate the wheel diameter parameter of each wheel according to the number of the wheel speed pulse signals. When the vehicle is in a straight-ahead working condition, judging the tire pressure condition of the wheels according to the wheel diameter parameters of each wheel; and if the vehicle is in a turning working condition, correcting the wheel diameter parameter of each wheel, so that the influence of turning on the wheel diameter parameter is eliminated, and the tire pressure condition of each wheel is accurately judged. And various factors influencing the wheel diameter parameters are comprehensively considered, and the wheel diameter parameters are compensated to eliminate the influence of the factors on the wheel diameter parameters, so that the accuracy of judging the tire pressure conditions of the wheels is further improved.
Further, the invention provides a vehicle control unit.
In the embodiment of the invention, the vehicle control unit comprises a memory, a processor and a tire underpressure identification program which is stored on the memory and can run on the processor, and the tire underpressure identification method is realized when the processor executes the tire underpressure identification program.
According to the vehicle control unit provided by the embodiment of the invention, the wheel speed pulse signal of each wheel can be obtained by realizing the tire underpressure identification method, the wheel diameter parameter of each wheel is calculated according to the wheel speed pulse signal number, and the tire pressure condition of the wheel is judged by using the wheel diameter parameter calculated according to the wheel speed pulse signal, so that the judgment can be carried out under the straight-ahead working condition and the turning working condition, and the cost is low. When the vehicle is in a straight-ahead working condition, judging the tire pressure condition of the wheels according to the wheel diameter parameters of each wheel; and if the vehicle is in a turning working condition, correcting the wheel diameter parameter of each wheel, so that the influence of turning on the wheel diameter parameter is eliminated, and the tire pressure condition of each wheel is accurately judged. And various factors influencing the wheel diameter parameters are comprehensively considered, and the wheel diameter parameters are compensated to eliminate the influence of the factors on the wheel diameter parameters, so that the accuracy of judging the tire pressure conditions of the wheels is further improved.
Fig. 4 is a block diagram showing the structure of the tire underpressure recognition apparatus according to the embodiment of the present invention.
As shown in FIG. 4, the under-pressure tire identification apparatus 100 includes an obtaining module 101, a first determining module 102, a second determining module 103, and an identifying module 105.
Specifically, the obtaining module 101 is configured to obtain a wheel speed signal, vehicle steering information, and a vehicle speed of each wheel; the first determining module 102 is configured to determine a wheel speed pulse number of each wheel within a preset time according to the wheel speed signal of each wheel, and determine a wheel diameter parameter of each wheel according to the wheel speed pulse number of each wheel within the preset time; the second determination module 103 is used for determining the current running condition of the vehicle according to the vehicle steering information; the identification module 105 is used for performing under-pressure identification on each wheel according to the current running condition of the vehicle and the wheel diameter parameter of each wheel.
It should be noted that, for other specific implementations of the tire underpressure identification apparatus according to the embodiment of the present invention, reference may be made to the above tire underpressure identification method.
According to the tire under-pressure identification device provided by the embodiment of the invention, the wheel diameter parameter of each wheel is calculated according to the number of the wheel speed pulse signals by acquiring the wheel speed pulse signals of each wheel, and the tire pressure condition of each wheel is judged by using the wheel diameter parameter calculated according to the wheel speed pulse signals, so that the judgment can be carried out under both a straight-going working condition and a turning working condition, and the cost is low. When the vehicle is in a straight-ahead running condition, judging the tire pressure condition of the wheels according to the wheel diameter parameter of each wheel; and if the vehicle is in a turning working condition, correcting the wheel diameter parameter of each wheel, so that the influence of turning on the wheel diameter parameter is eliminated, and the tire pressure condition of each wheel is accurately judged. And moreover, various factors which can influence the wheel diameter parameters are comprehensively considered, and the wheel diameter parameters are compensated to eliminate the influence of the factors on the wheel diameter parameters, so that the accuracy of judging the tire pressure conditions of the wheels is further improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as 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. For example, 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.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means 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 do not necessarily 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.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
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.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
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.

Claims (15)

1. An under-pressure tire identification method is characterized by comprising the following steps:
acquiring a wheel speed signal, vehicle steering information and a vehicle speed of each wheel;
determining the wheel speed pulse number of each wheel within preset time according to the wheel speed signal of each wheel, and determining the wheel diameter parameter of each wheel according to the wheel speed pulse number of each wheel within preset time;
determining the current running condition of the vehicle according to the vehicle steering information;
and performing under-pressure identification on each wheel according to the current running condition of the vehicle and the wheel diameter parameter of each wheel.
2. The under-pressure tire identification method according to claim 1, wherein the under-pressure identification of each wheel according to the current running condition of the vehicle and the wheel diameter parameter of each wheel comprises:
when the current running working condition of the vehicle is a steering working condition, determining a first wheel diameter correction quantity according to the vehicle steering information and the vehicle speed;
when the steering working condition is a right steering working condition, correcting the wheel diameter parameters of the two wheels on the left side of the vehicle by adopting the first wheel diameter correction quantity, performing under-pressure identification on the two wheels on the left side of the vehicle according to the corrected wheel diameter parameters, and performing under-pressure identification on the two wheels on the right side of the vehicle according to the wheel diameter parameters of the two wheels on the right side of the vehicle;
and when the steering working condition is a left steering working condition, correcting the wheel diameter parameters of the two wheels on the right side of the vehicle by adopting the first wheel diameter correction quantity, performing under-pressure identification on the two wheels on the right side of the vehicle according to the corrected wheel diameter parameters, and performing under-pressure identification on the two wheels on the left side of the vehicle according to the wheel diameter parameters of the two wheels on the left side of the vehicle.
3. The under-pressure tire identification method according to claim 1, wherein determining the wheel diameter parameter of each wheel according to the wheel speed pulse number of each wheel within a preset time comprises:
determining the maximum pulse number or the minimum pulse number according to the wheel speed pulse number of each wheel in preset time;
and calculating the wheel diameter parameter of each wheel according to the maximum pulse number or the minimum pulse number and the wheel speed pulse number of each wheel in preset time.
4. A method for identifying underpressure in a tyre as claimed in claim 3, characterized in that the wheel diameter parameter of each wheel is calculated according to the following formula:
r j ＝N 0 (1/N j -1/N 0 )
wherein r is j Representing the wheel diameter parameter, N, of each of said wheels 0 Representing the maximum or minimum number of pulses, N j The wheel speed pulse number of each wheel in a preset time is represented.
5. The under-tire pressure identification method of claim 2, wherein the vehicle steering information includes a steering angle and/or a yaw rate.
6. The under-pressure tire identification method according to claim 5, wherein when the vehicle steering information includes a yaw rate, the first wheel diameter correction amount is calculated according to the following formula:
Figure FDA0003125324850000021
wherein dr is 1 Represents the first wheel diameter correction amount, v represents the vehicle speed, D represents the wheel track, W z Representing the yaw rate.
7. The under-pressure tire identification method according to claim 2, wherein the under-pressure identification is performed on each wheel according to the current driving condition of the vehicle and the wheel diameter parameter of each wheel, and further comprising:
and when the current running working condition of the vehicle is a straight running working condition, carrying out under-voltage identification on the corresponding wheels according to the wheel diameter parameter of each wheel.
8. The under-pressure tire identification method according to any one of claims 1 to 7, further comprising, before identifying the under-pressure of the wheel:
determining a front-to-rear load difference of the vehicle;
when the front-rear load difference is larger than a preset load, determining a second wheel diameter correction amount according to the front-rear load difference;
and correcting the wheel diameter parameter corresponding to the wheel with large load according to the second wheel diameter correction quantity.
9. A tire underpressure recognition method according to claim 8, characterized in that the second wheel correction amount is calculated according to the following formula:
dr 2 ＝k 2 Δm
wherein dr is 2 Is the second wheel diameter correction amount, k 2 And is a second preset proportionality coefficient, and Δ m is the front-rear load difference.
10. The under-pressure tire identification method according to any one of claims 1 to 7, further comprising, before identifying the under-pressure of the wheel:
determining a current driving force or braking force of the vehicle when it is determined that the vehicle is accelerating or braking;
and determining a third wheel diameter correction amount according to the current driving force or braking force of the vehicle, and correcting the wheel diameter parameter corresponding to each wheel according to the third wheel diameter correction amount.
11. A tire underpressure recognition method according to claim 10, characterized in that the third radius correction is calculated according to the following formula:
dr 3 ＝k 3 F
wherein dr is 3 Is the third radial correction amount, k 3 Is a third preset proportionality coefficient, and F is the current driving force or braking force of the vehicle.
12. The under-pressure tire identification method according to any one of claims 1 to 7, further comprising, before identifying the under-pressure of the wheel:
acquiring a fourth wheel diameter correction amount corresponding to each wheel;
and correcting the wheel diameter parameters corresponding to the corresponding wheels according to the fourth wheel diameter correction amount corresponding to each wheel.
13. A computer-readable storage medium, having stored thereon a tire underpressure identification program, which when executed by a processor, implements a tire underpressure identification method according to any of claims 1-12.
14. A vehicle control unit, comprising a memory, a processor and a tire underpressure identification program stored in the memory and executable on the processor, wherein the processor implements the tire underpressure identification method according to any one of claims 1-12 when executing the tire underpressure identification program.
15. An under-pressure tire identification device, comprising:
the acquisition module is used for acquiring a wheel speed signal, vehicle steering information and a vehicle speed of each wheel;
the first determining module is used for determining the wheel speed pulse number of each wheel in preset time according to the wheel speed signal of each wheel, and determining the wheel diameter parameter of each wheel according to the wheel speed pulse number of each wheel in the preset time;
the second determining module is used for determining the current running working condition of the vehicle according to the vehicle steering information;
and the identification module is used for carrying out under-voltage identification on each wheel according to the current running working condition of the vehicle and the wheel diameter parameter of each wheel.
CN202110687598.6A 2021-06-21 2021-06-21 Tire underpressure identification method and device, storage medium and vehicle control unit Pending CN115570916A (en)

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Application Number Priority Date Filing Date Title
CN202110687598.6A CN115570916A (en) 2021-06-21 2021-06-21 Tire underpressure identification method and device, storage medium and vehicle control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110687598.6A CN115570916A (en) 2021-06-21 2021-06-21 Tire underpressure identification method and device, storage medium and vehicle control unit

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CN115570916A true CN115570916A (en) 2023-01-06

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