CN110220473A - Study on tire pattern depth measurement method, device and equipment - Google Patents
Study on tire pattern depth measurement method, device and equipment Download PDFInfo
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- CN110220473A CN110220473A CN201910484386.0A CN201910484386A CN110220473A CN 110220473 A CN110220473 A CN 110220473A CN 201910484386 A CN201910484386 A CN 201910484386A CN 110220473 A CN110220473 A CN 110220473A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
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Abstract
The present invention relates to a kind of study on tire pattern depth measurement method, device and equipment, it is related to tire testing technique field, wherein, method includes the acquisition data for receiving laser sensor and sending, and acquisition data are obtained by laser sensor horizontal sweep surface of tyre, and acquisition data are fitted, obtain fitting data, the data difference of acquisition data and fitting data is calculated, if data difference is greater than threshold value, using data difference as the depth value of groove.
Description
Technical field
The present invention relates to tire testing technique fields, and in particular to study on tire pattern depth measurement method, device and equipment.
Background technique
Tire is place of the vehicle complete vehicle uniquely with ground face contact, is contacted throughout the year with ground, therefore have different degrees of
Abrasion, so that the service life of tire gradually decreases.The surplus of tyre tread trench depth is judge Life of Tyre important
Foundation is mainly measured by tire depthometer or tyre digital depthometer, but tire depthometer is main in the related technology
By artificially measuring, error is larger, also, precision is lower；And tyre digital depthometer needs hand-held digital display in measurement
Tire depthometer first measures the depth of tire tread, and in the depth of measurement groove, in change place measurement, the position of manpower is not
It is able to maintain on a horizontal line, so that the result inaccuracy of measurement, error are larger.
Summary of the invention
In view of this, in order to solve the problems, such as that present in the relevant technologies, the present invention provides one kind at least to a certain extent
Study on tire pattern depth measurement method, device and equipment.
The present invention adopts the following technical scheme:
In a first aspect, a kind of study on tire pattern depth measurement method, comprising:
The acquisition data that laser sensor is sent are received, the acquisition data are by the laser sensor horizontal sweep
What surface of tyre obtained；
The acquisition data are fitted, fitting data is obtained；
Calculate the data difference of the acquisition data and fitting data；
If the data difference is greater than threshold value, using the data difference as the depth value of groove.
Optionally, it is described the acquisition data are fitted before, further includes:
Denoising is carried out to the acquisition data, the interference data in the acquisition data are removed, to interfere removal
Acquisition data after data are fitted.
Optionally, the data difference for calculating the acquisition data and fitting data, comprising:
The first curve is drawn according to the sweep time of the acquisition data and the laser sensor；
The second curve is drawn according to the fitting data and the sweep time；
Calculate the data difference in first curve and second curve at the same scan time.
Optionally, if the data difference is greater than threshold value, using the data difference as the depth value of groove,
Include:
First curve at sweep time and the data difference in second curve are greater than threshold value if they are the same, then really
Fixed this sweep time corresponding scan position is study on tire pattern position, and using the data difference as this study on tire pattern position
Set the depth value of groove.
Optionally, further includes:
It calculates at each groove position, the data difference is persistently greater than the sweep time of threshold value；
The width of each groove is calculated according to the scanning speed of the sweep time and the laser sensor that are calculated.
Optionally, further includes:
Second dervative is taken to first curve；
Obtain the position that second dervative is zero in first curve；
The quantity and groove for determining study on tire pattern according to the position that the second dervative is zero are in first curve
On position.
Optionally, further includes:
Calculate the average value of the acquisition data and the fitting data difference at the study on tire pattern position；
Using the average value as the data difference.
It is optionally, described to be fitted the acquisition data, comprising:
The acquisition data are fitted by the way of fitting of a polynomial.
Second aspect provides a kind of study on tire pattern depth measurement device, comprising: linear motion mould group, laser sensor,
Receiving module, data fitting module and computing module；The laser sensor is arranged in the linear motion mould group；
The linear motion mould group, for driving the laser sensor horizontal rectilinear motion；
The receiving module, for receiving the acquisition data of laser sensor transmission；
The data fitting module obtains fitting data for being fitted the acquisition data；
The computing module, for calculating the data difference of the acquisition data and fitting data, and in the data difference
When value is greater than threshold value, using the data difference as the depth value of groove.
The third aspect, a kind of study on tire pattern depth measuring devices, comprising:
Processor, and the memory being connected with the processor；
The memory is for storing computer program；
The processor is for calling and executing the computer program in the memory, to execute such as first aspect
The study on tire pattern depth measurement method.
Fourth aspect, a kind of storage medium, the storage medium are stored with computer program, and the computer program is located
When managing device execution, study on tire pattern depth measurement method as described in relation to the first aspect is realized.
The invention adopts the above technical scheme, the acquisition obtained by receiving the scanning surface of tyre that laser sensor is sent
Data, and acquisition data are fitted, fitting data is obtained, and then calculate the data difference of acquisition data and fitting data；
When data difference is greater than threshold value, using data difference as the depth value of groove, so that groove depth is obtained, in this way, not
Operational depth ruler etc. must be artificially removed, related data only can be obtained by laser sensor horizontal sweep tire, reduced by people
To measure bring error.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow diagram for the study on tire pattern depth measurement method that the embodiment of the present invention one provides；
Fig. 2 is the flow diagram of study on tire pattern depth measurement method provided by Embodiment 2 of the present invention；
Fig. 3 is the curve signal of the acquisition data of study on tire pattern depth measurement method provided by Embodiment 2 of the present invention
Figure；
Fig. 4 is the first curve and the second curve of study on tire pattern depth measurement method provided by Embodiment 2 of the present invention
Schematic diagram；
Fig. 5 is the structural schematic diagram for the study on tire pattern depth measurement device that the embodiment of the present invention three provides；
Fig. 6 is the structural schematic diagram for the study on tire pattern depth measuring devices that the embodiment of the present invention four provides.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
The traffic safety of pattern depth and driver are closely bound up.The rotating radial of China's national Specification car
The tire decorative pattern limit of wear be 1.6mm, lorry, car the Tread Pattern of Meridian Tyre limit of wear be 2.0mm.Pattern depth
By following standard inspection: good: greater than 3.5mm；It is recommended that replacement next time: 2.5~3.5mm；Need replacing: less than 2.5mm；Replacement
Limiting value: 1.6mm；If tire aging, cracking are serious, should also replace in advance.
Embodiment one
Fig. 1 is the flow diagram for the study on tire pattern depth measurement method that the embodiment of the present invention one provides.Such as Fig. 1 institute
Show, the present embodiment provides a kind of study on tire pattern depth measurement methods, comprising:
Step 101 receives the acquisition data that laser sensor is sent, and acquisition data are by laser sensor horizontal sweep
What surface of tyre obtained；
In some embodiments, there are many modes that make laser sensor horizontal sweep surface of tyre, for example, can be by laser
Sensor setting is in linear motion mould group.
Acquisition data are fitted by step 102, obtain fitting data；
In some embodiments, fitting data can be obtained by the way of fitting of a polynomial.
Step 103, the data difference for calculating acquisition data and fitting data；
If step 104, data difference are greater than threshold value, using data difference as the depth value of groove.
In the present embodiment, the acquisition data obtained by receiving the scanning surface of tyre that laser sensor is sent, and will adopt
Collection data are fitted, and obtain fitting data, and then calculate the data difference of acquisition data and fitting data；It is big in data difference
When threshold value, using data difference as the depth value of groove, so that groove depth is obtained, in this way, need not artificially go to operate
Depthometer etc. only can obtain related data by laser sensor horizontal sweep tire, reduce by artificially measuring bring
Error.
Embodiment two
Fig. 2 is the flow diagram of study on tire pattern depth measurement method provided by Embodiment 2 of the present invention.Such as Fig. 2 institute
Show, the present embodiment provides two kinds of study on tire pattern depth measurement methods, comprising:
Step 201 receives the acquisition data that laser sensor is sent, and acquisition data are by laser sensor horizontal sweep
What surface of tyre obtained；
Wherein, there are many modes for making laser sensor horizontal sweep surface of tyre, for example, laser sensor can be set
It sets in linear motion mould group.In the process of moving due to vehicle, tire is to be rotationally advancing, therefore the decorative pattern of surface of tyre is worn
Degree is almost consistent, therefore, in measurement, can choose any position and measures, in order to more acurrate, can repeatedly measure wheel
Tire surface different location takes mean value.
In addition, laser pulse is first emitted by laser emitting diode alignment target when laser sensor works, it is anti-through target
It penetrates rear laser to scatter to all directions, some scattered light returns to transducer receivers, is imaged onto snowslide after being received by optical system
On photodiode, avalanche photodide is a kind of optical sensor of the inside with enlarging function, therefore it can detect pole
Its faint optical signal, and it is translated into corresponding electric signal.Commonly laser sensor, it by record and handle from
Light pulse is issued to return and is received the time experienced, can measure target range.
In general, the electric signal that laser sensor returns is that the voltage value of 0 to 5 volt is measured referring to Fig. 3 for laser sensor
The voltage value to surface of tyre curve.In this step, laser sensor can be according to the time and laser for receiving signal
Speed, can also according to the electric signal of return and the parameter of laser sensor, calculate testee (surface of tyre) to swash
The distance of optical sensor.Hereinafter, being illustrated for being calculated according to the parameter of the electric signal of return and laser sensor.
Step 202 carries out denoising, the interference data in removal acquisition data, to interfere removal to acquisition data
Acquisition data after data are fitted.
In the specific implementation, there are many modes that acquisition data are carried out with denoising, is specifically referred to the relevant technologies
In content, details are not described herein again.In the present embodiment, in the electric signal of the received return of laser sensor, it is to have that 4 volts below
Data are imitated, by voltage value are that 4 volts or more of interference data are deleted, are further operated to make to obtain valid data.Ginseng
According to the curve that Fig. 4, Fig. 4 are to the acquisition data after interference data de-noising.
Step 203 is fitted acquisition data by the way of fitting of a polynomial, obtains fitting data；
Wherein, there are many modes of fitting, in this step, acquisition data are intended by the way of fitting of a polynomial
It closes.MATLAB software or python can be used, to be fitted to data.There is polyfit (x, y, n) to count in MATLAB
Calculate multinomial coefficient, wherein x, y represent sample point data collection, and n represents fitting order, then has P (x)=p1xn+p2xn-1+...+
pnx1+pn+1。
Step 204 draws the first curve according to the sweep time of acquisition data and laser sensor；
Referring to Fig. 4, it is based on foregoing description, the present embodiment is calculated according to the electric signal returned and the parameter of laser sensor
Surface of tyre is to the distance of laser sensor, and therefore, in the coordinate system of the first curve of drafting, horizontal axis is sweep time, indulges
Axis is voltage value.Certainly, the selection of coordinate system can be according to the use habit of user in the present embodiment.It is when scanning with horizontal axis
Between for, figure 4, it is seen that the first curve has protrusion, which show laser sensors when scanning is to this position, electricity
Pressure value is changed, and is also meaned that different from the depth of surface of tyre herein.
It should be noted that being also similarly the fitting to voltage value to the fitting of acquisition data in step 203.
Step 205 draws the second curve according to fitting data and sweep time；
It is a smooth curve, shows according to the second curve that fitting data and sweep time draw out referring to Fig. 3
Surface of tyre is in no ditch, the voltage value of laser sensor feedback.
Data difference in step 206, the first curve and the second curve at the calculating same scan time；
Since the second curve characterizes voltage value of the surface of tyre without ditch when, by the phase of the first curve and the second curve
Subtracted each other with the voltage value at sweep time, obtained data difference, is voltage difference herein away from surface of tyre.In turn
Its actual range can be calculated according to parameter.
Step 207, the if they are the same data difference in the first curve and the second curve at sweep time are greater than threshold value, then really
Fixed this sweep time corresponding scan position is study on tire pattern position, and using data difference as this study on tire pattern position flower
The depth value of groove；
Due to not only having deeper groove on surface of tyre, some tiny grooves are also had.It is usually relatively deep
Groove have three Dao Huo tetra-, be mainly used for draining.And laser sensor is that can also measure tiny groove in measurement,
In the present embodiment, the difference calculated in step 206 is compared with threshold value, if more than threshold value, then it represents that groove is deeper, really
Fixed its is the position of groove, and if difference is less than threshold value, then it represents that at its at lesser decorative pattern, therefore, be not considered as herein
For the position of groove.
Wherein it is determined that the mode of groove position can be with are as follows:
Second dervative is taken to the first curve；
Obtain the position that second dervative is zero in the first curve；
The position of the quantity and groove of study on tire pattern on the first curve is determined according to the position that second dervative is zero.
Due in the first curve, there are multiple protrusions to take second dervative to the first curve by taking three grooves as an example
When, the position that six second dervatives are zero can be generated.
After determining groove position, the depth value of groove herein can be calculated according to difference.
Step 208 calculates at each groove position, and data difference is persistently greater than the sweep time of threshold value；
Step 209, the width that each groove is calculated according to the scanning speed of the sweep time and laser sensor that are calculated
Degree.
The width that study on tire pattern can be determined according to step 208 and step 209 is continued by first calculating data difference
Greater than the sweep time of threshold value laser sensor in curve, that is, the time of laser sensor scanning groove.And then it is logical
The speed of the time and scanning that over-scan groove calculate the width of groove.
The depth of calculating groove in order to be more accurate, in the present embodiment, additionally provides by calculating study on tire pattern
The average value of data and fitting data difference is acquired at position, and using average value as the mode of data difference, final confirmation flower
The depth of groove, in this way, measurement result can be made more accurate.Wherein, acquisition data herein and fitting data are in step
In rapid 208, data difference is persistently greater than acquisition data and fitting data in the sweep time section of threshold value.
Embodiment three
Fig. 4 is the structural schematic diagram for the study on tire pattern depth measurement device that the embodiment of the present invention three provides.Such as Fig. 4 institute
Show, the present embodiment provides a kind of study on tire pattern depth measurement devices, comprising:
Move along a straight line mould group, laser sensor, receiving module, data fitting module and computing module；Laser sensor is set
It sets in linear motion mould group；
Move along a straight line mould group, for driving laser sensor horizontal rectilinear motion；
Receiving module, for receiving the acquisition data of laser sensor transmission；
Data fitting module is fitted for that will acquire data, obtains fitting data；
Computing module, for calculating the data difference of acquisition data and fitting data.
Wherein, linear motion mould group can be lead screw, and the speed of movement can be configured by relevant parameter.
The specific implementation of the present embodiment may refer to the tyre tread ditch depth in above-described embodiment one and embodiment two
The related description in measurement method embodiment is spent, details are not described herein again.
Example IV
Fig. 5 is the structural schematic diagram for the study on tire pattern depth measuring devices that the embodiment of the present invention four provides.Such as Fig. 5 institute
Show, the present embodiment provides a kind of study on tire pattern depth measuring devices, comprising:
Processor, and the memory being connected with processor；
Memory is for storing computer program；
Processor is for calling and executing the computer program in memory, to execute such as the tire in embodiment one or two
Groove depth measurement method.
The specific implementation of the present embodiment may refer to the tyre tread ditch depth in above-described embodiment one and embodiment two
The related description in measurement method embodiment is spent, details are not described herein again.
Embodiment five
The present embodiment provides a kind of storage medium, storage medium is stored with computer program, and computer program is by processor
When execution, realize such as study on tire pattern depth measurement method in embodiment one or embodiment two.
The specific implementation of the present embodiment may refer to the study on tire pattern that previous embodiment one and embodiment two are recorded
Related description in depth measurement method embodiment, details are not described herein again.
It is understood that same or similar part can mutually refer in the various embodiments described above, in some embodiments
Unspecified content may refer to the same or similar content in other embodiments.
It should be noted that in the description of the present invention, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
Refer at least two.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, Lai Zhihang function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction executing device with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
It, can also be in addition, each functional unit in each embodiment of the present invention can integrate in a processing module
It is that each unit physically exists alone, can also be integrated in two or more units in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized and when sold or used as an independent product in the form of software function module, also can store in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of study on tire pattern depth measurement method characterized by comprising
The acquisition data that laser sensor is sent are received, the acquisition data are by the laser sensor horizontal sweep tire
What surface obtained；
The acquisition data are fitted, fitting data is obtained；
Calculate the data difference of the acquisition data and fitting data；
If the data difference is greater than threshold value, using the data difference as the depth value of groove.
2. the method according to claim 1, wherein it is described the acquisition data are fitted before, also wrap
It includes:
Denoising is carried out to the acquisition data, the interference data in the acquisition data are removed, to interfere data to removal
Acquisition data afterwards are fitted.
3. the method according to claim 1, wherein the data for calculating the acquisition data and fitting data
Difference, comprising:
The first curve is drawn according to the sweep time of the acquisition data and the laser sensor；
The second curve is drawn according to the fitting data and the sweep time；
Calculate the data difference in first curve and second curve at the same scan time.
4. if, will be described according to the method described in claim 3, it is characterized in that, the data difference is greater than threshold value
Depth value of the data difference as groove, comprising:
First curve at sweep time and the data difference in second curve are greater than threshold value if they are the same, it is determined that this
Sweep time corresponding scan position is study on tire pattern position, and using the data difference as this study on tire pattern position flower
The depth value of groove.
5. according to the method described in claim 4, it is characterized by further comprising:
It calculates at each groove position, the data difference is persistently greater than the sweep time of threshold value；
The width of each groove is calculated according to the scanning speed of the sweep time and the laser sensor that are calculated.
6. according to the method described in claim 3, it is characterized by further comprising:
Second dervative is taken to first curve；
Obtain the position that second dervative is zero in first curve；
The quantity and groove for determining study on tire pattern according to the position that the second dervative is zero are on first curve
Position.
7. according to the method described in claim 4, it is characterized by further comprising:
Calculate the average value of the acquisition data and the fitting data difference at the study on tire pattern position；
Using the average value as the data difference.
8. the method according to claim 1, wherein described be fitted the acquisition data, comprising:
The acquisition data are fitted by the way of fitting of a polynomial.
9. a kind of study on tire pattern depth measurement device characterized by comprising linear motion mould group, laser sensor receive
Module, data fitting module and computing module；The laser sensor is arranged in the linear motion mould group；
The linear motion mould group, for driving the laser sensor horizontal rectilinear motion；
The receiving module, for receiving the acquisition data of laser sensor transmission；
The data fitting module obtains fitting data for being fitted the acquisition data；
The computing module, for calculating the data difference of the acquisition data and fitting data, and it is big in the data difference
When threshold value, using the data difference as the depth value of groove.
10. a kind of study on tire pattern depth measuring devices characterized by comprising
Processor, and the memory being connected with the processor；
The memory is for storing computer program；
The processor is for calling and executing the computer program in the memory, to execute such as claim 1-8
Described in any item methods.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111301063A (en) * | 2020-03-06 | 2020-06-19 | 知轮(杭州)科技有限公司 | Method for calculating tire wear according to tire pattern depth data |
| CN111340973A (en) * | 2020-03-06 | 2020-06-26 | 知轮(杭州)科技有限公司 | Auxiliary inspection system and method based on vehicle tire intelligent system |
| CN111366382A (en) * | 2020-03-06 | 2020-07-03 | 知轮(杭州)科技有限公司 | Method and equipment for detecting tyre flower depth |
| CN112629470A (en) * | 2020-12-22 | 2021-04-09 | 石家庄市科恒电子有限公司 | Depth measurement method and depth measurement system |
| CN115839696A (en) * | 2023-02-27 | 2023-03-24 | 清华大学苏州汽车研究院（相城） | Tire pattern depth measuring method, device, storage medium and system |
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