CN108120651A - Vehicle tracking test instrument automatic detection device and control method - Google Patents
Vehicle tracking test instrument automatic detection device and control method Download PDFInfo
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- CN108120651A CN108120651A CN201711281314.3A CN201711281314A CN108120651A CN 108120651 A CN108120651 A CN 108120651A CN 201711281314 A CN201711281314 A CN 201711281314A CN 108120651 A CN108120651 A CN 108120651A
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
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Abstract
The invention discloses a kind of vehicle tracking test instrument automatic detection devices, and including square pedestal, upper surface is coaxially provided with cylindrical recesses, and close circumferential edge is uniformly provided with multiple column guide posts in the groove；Turbine and worm retarder is installed among the groove, and the turbine and worm retarder upper surface center is equipped with encoder；Hollow disc shape support member, is equipped with and the columnar through holes that match of the guide post, with the pedestal it is coaxial, can be up and down be set on the guide post；Butterfly force value sensor is installed in by thread bush above the encoder；Multiple wire Temperature Humidity Sensors, four that the pedestal is located in lower end are diagonal.The present invention also provides the control methods that a kind of vehicle tracking test instrument detects automatically, and examination wheel displacement and detection circuit voltage are adjusted based on BP neural network when vehicle tracking test instrument detects automatically.The present invention realizes the automatic detection of integration；The accuracy under the same test environment of test system is improved simultaneously.
Description
Technical field
The present invention relates to wheel tracking test field more particularly to a kind of vehicle tracking test instrument automatic detection devices.
Background technology
Vehicle tracking test instrument is mainly used for the measure of the high temperature rutting resistance of asphalt, it can also be used to asphalt
The complementary inspection of proportion design.Vehicle tracking test instrument is the optimal simulator of Road Compaction.The characteristic of its sample prepared
It is very similar to the characteristic of Road Compaction layer, it also can be directly used for wheel tracking test.Vehicle tracking test instrument is widely used in road and builds
And if test in laboratory.
In recent years, China builds traffic infrastructure energetically, Investment in Basic Facilities for Traffic dynamics is increased.The coming years I
State's highway construction market space is still larger, and particularly western region highway construction investment will increase faster, the space in market
It can bigger.To ensure road quality, vehicle tracking test instrument will certainly be widely applied, therefore vehicle tracking test instrument automatic detection device
Invention will be further that road quality provides safeguard safely, fill the domestic gaps.
Each third party testing agency all carries out the detection of vehicle tracking test instrument using subitem at this stage, is set with a variety of measurements
It is standby to be detected one by one, it not only waste of resource but also had lost time, and general detecting instrument cannot largely meet the ring at scene
Border and space requirement (such as：Can be because space constraints using general force value sensor measurement force value, fixed form restricts, temperature
Humidity restriction etc.；And counterweight is directly weighed using electronic scale, and can ignore to fall the friction of connection guiding mechanism generation, concentricity mistake
Force value caused by difference changes), and detection of itemizing can not reflect the authentic and valid trystate under comprehensive function, while again can
Because a variety of instruments and multiple testing staff can cause the increase of measurement result uncertainty.
Therefore, a kind of integrated automatic detection device is designed, accuracy in detection is greatly improved, becomes more and more important.
The content of the invention
In place of the present invention is solves the deficiencies in the prior art, a kind of vehicle tracking test instrument automatic detection device is provided, is solved
The problem of branch is needed to test, realizes the automatic detection of integration；
It is another object of the present invention to improve the measuring accuracy under different test environments.
Technical solution provided by the invention is：A kind of vehicle tracking test instrument automatic detection device is provided, including：
Square pedestal, upper surface are coaxially provided with cylindrical recesses, and close circumferential edge is uniformly provided with multiple columns in the groove
Shape guide post；
Turbine and worm retarder is installed among the groove, and the turbine and worm retarder upper surface center is equipped with
Encoder；
Hollow disc shape support member, is equipped with and the columnar through holes that match of the guide post, with the pedestal it is coaxial, can
It is set in up and downly on the guide post；
Butterfly force value sensor is installed in by thread bush above the encoder, test examination wheel pressure；
Multiple wire Temperature Humidity Sensors, four that the pedestal is located in lower end are diagonal.
Preferably, further include：
Column planetary reducing motor is installed in the base groove bottom by bolt, and passes through shaft coupling and be installed in
One side surface of the turbine and worm retarder.
Preferably, the turbine and worm retarder is quadrangular shape, and centre of surface is equipped with cylindrical boss thereon, described
The catercorner length of turbine and worm retarder is less than the support member.
Preferably, the encoder center is equipped with circular through hole, and the circular through hole is set on the boss.
Preferably, controller is bolted on the base groove bottom.
Preferably, the controller be internally provided with integrated power detection unit, temperature detecting unit, displacement control unit and
Force value, temperature, displacement are transmitted in Bluetooth transmission unit, respectively test.
Preferably, the outer diameter of the support member is less than the radius of the groove, and the internal diameter of the support member is more than
The outer diameter of the force value sensor.
Preferably, friction force sensor is arranged on the clamp surface, for testing examination wheel and the platen surface
Frictional force；
Velocity sensor is arranged on the clamp surface, and wheel movement rate is tried for measuring；
Examination wheel controller is arranged on examination wheel axle center, for controlling the experiment displacement of examination wheel；
Controller, is bolted on the base groove bottom, and the controller is internally provided with integrated power detection
Unit, temperature detecting unit, displacement control unit and Bluetooth transmission unit, and connect friction force sensor, velocity sensor, pressure
Force snesor, detection circuit, examination wheel controller, for receiving the detection data of the sensor and examination wheel controller, control inspection
Slowdown monitoring circuit, motor and examination wheel displacement.
Preferably, the control method that a kind of vehicle tracking test instrument detects automatically, which is characterized in that when vehicle tracking test instrument is automatic
Examination wheel displacement and detection circuit voltage are adjusted based on BP neural network during detection, included the following steps：
Step 1: according to the sampling period, by sensor collecting temperature T, humidity H, examination wheel pressure P, examination is taken turns and pressing plate
Skin-friction force f, examination wheel movement first rate V；
Step 2: successively by temperature T, humidity H, examination wheel ground connection pressure P tries wheel and clamp surface frictional force f, and examination wheel moves
First rate V standardizes, and determines input layer vector x={ x of three layers of BP neural network1,x2,x3,x4,x5}；Wherein, x1For temperature
Spend coefficient, x2For humidity coefficient, x3Pressure coefficient, x are taken turns for examination4For examination wheel and clamp surface friction coefficient, x5For examination wheel movement
Initial velocity rate coefficient；
Step 3: the input layer DUAL PROBLEMS OF VECTOR MAPPING is to interlayer, the interlayer vector y={ y1,y2,…,ym}；During m is
Interbed node number；
Step 4: obtain output layer vector z={ z1,z2}；Wherein z1The adjustment factor of walking displacement, z are taken turns for examination2For inspection
The voltage regulation coefficient of slowdown monitoring circuit, makes
si+1=z1 ismax,
Ei+1=z2 iEmax,
Wherein, z1 i、z2 iRespectively ith sample cycle output layer vector parameter, smax、EmaxThe examination wheel respectively set
Maximum displacement, the maximum voltage of detection circuit；And
In the step 2, successively by temperature T, humidity H, examination wheel ground connection pressure P tries wheel and clamp surface frictional force f,
Examination wheel movement first rate V carries out normalization formulae formula and is：
Wherein, xjFor the parameter in input layer vector, XjRespectively measurement parameter T, H, P, f, V, j=1,2,3,4,5；
XjmaxAnd XjminMaximum and minimum value in respectively corresponding measurement parameter.
Preferably, in the step 1, under initial operating state, examination wheel experiment displacement, detection circuit voltage meet
Empirical value：
s0=0.87smax,
E0=0.88Emax,
Wherein, s0、E0Initial trial displacement, the initial voltage of detection circuit are taken turns in the examination respectively set；smax、EmaxRespectively
The maximum voltage of the maximum experiment displacement of examination wheel, detection circuit for setting
Advantageous effect of the present invention：1) using capacitive displacement transducer, have without friction, lossless mill and inertialess
Also big with signal-to-noise ratio outside feature, high sensitivity, drift is small, and frequency response is wide, non-linear small, and precision stability is good, electromagnetism interference
Ability is strong and uses the advantages that easy to operate；2) the shortcomings that multiple measurement indexes gather in real time phase can not be accomplished with the prior art
Than will really reflect the result of the test under this trystate；3) measurement activity is made to become simple, is avoided disposably with a variety of
Measuring apparatus causes the additional uncertainty that equipment room influences each other and repeatedly reading and operating personnel generate；4) basis
Different installation test environments, the displacement of examination wheel and the voltage of test circuit when adjusting test, to reduce test condition to surveying
Try the influence of precision.
Description of the drawings
Fig. 1 is the vehicle tracking test instrument automatic testing equipment schematic diagram of specific embodiments of the present invention.
Fig. 2 is the vehicle tracking test instrument automatic testing equipment concrete structure schematic diagram of specific embodiments of the present invention.
Fig. 3 is the vehicle tracking test instrument automatic testing equipment side view of specific embodiments of the present invention.
Fig. 4 is the vehicle tracking test instrument automatic testing equipment horizontal sectional drawing of specific embodiments of the present invention.
Fig. 5 is the vehicle tracking test instrument automatic testing equipment vertical cross section of specific embodiments of the present invention.
Fig. 6 is the workflow schematic diagram of specific embodiments of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
As shown in Figs. 1-3, in the present embodiment, vehicle tracking test instrument device includes square pedestal 1, in the square pedestal 1
Upper surface is equipped with coaxial cylindrical recesses, and four of upper surface are diagonally respectively equipped with four column little grooves.1 inside grooves of pedestal
Multiple column guide posts 14 are circumferentially uniformly provided with, the turbine and worm retarder 13 of quadrangular shape is coaxially fixed by multiple bolts 12
In the cylindrical recesses bottom centre of pedestal 1.Planetary reducing motor 2 is fixed on 13 one side of turbine and worm retarder by bolt 12
Bottom portion of groove, and be connected by shaft coupling 3 with planetary reducing motor 2.Controller 4 is fixed on turbine and worm by bolt 12 and subtracts
The bottom portion of groove of fast 13 opposite side of device.
The columnar through holes that discoid inner support component 7 is equipped with and column guide post 14 matches, can cover up and downly
It is located on the guide post 14, and it is coaxial with the pedestal axle center.And the internal diameter of inner support component 7 is more than turbine and worm retarder 13
Diagonal line length, then turbine and worm retarder 13 it is up and down in the inside of interior support member 7 not influence its.Turbine and worm slows down
The upper surface center of device 13 is equipped with cylindrical projection, is arranged with encoder 5 in protrusion, displacement signal can be converted into telecommunications by encoder
Number.Butterfly force value sensor 8 is sequentially connected by thread bush 6 and encoder 5.And the diameter of force value sensor 8 is less than inner support
The internal diameter of component 7, then force value sensor 8 can be up and down and unrestricted.The top of butterfly force value sensor 8 is coaxially provided with pressure
Load 0 is born in plate 9, top, for testing.
The lower end of four Temperature Humidity Sensors 11 is cylinder, can be in four little grooves of embedding inserted base 1.Humiture
The signal wire of sensor 11 can be arranged arbitrarily in outside, external cladding gooseneck in space.Temperature Humidity Sensor is popped one's head in
10 use A grades of Pt100 platinum resistance Temperature Humidity Sensors of four-wire system.4 inside of controller in pedestal 1 integrates power inspection equipped with controller
Survey unit, temperature detecting unit, displacement control unit and Bluetooth transmission unit.Integrated power detection unit inside controller 4 with
The transmission connection of force value sensor 8, temperature detecting unit and four transmission of Temperature Humidity Sensor 11 connect, inside displacement control unit
Detection circuit can detect the variation of capacitance, measure displacement so as to be converted into electric signal (variation of frequency).
Inner support component 7 can be moved up and down by the driving of planetary reducing motor 2 by guide post 14, with the medial surface A of pedestal 1
The two-stage of face and the circumferential lateral surface B faces of inner support component 7 as capacitance, and insulation processing is carried out, inner support component is transported about 7
It is dynamic, induction area between the B faces of inner support component 7 and the A faces of pedestal 1 is caused to change, is led by the variation of induction area S
The variation of appearance is sent a telegraph, then the variation of capacitance is converted into measure displacement by detection circuit by electric signal (variation of frequency).
As shown in fig. 6, when vehicle tracking test instrument automatic detection device is started to work, temperature and humidity sensing can be passed through respectively
Device, force value sensor and displacement sensor obtain temperature, force value and displacement respectively, collect handled after data, store with
Printing, the data result finally needed.The test for being carried out at the same time three data is collected, and improves efficiency and accuracy.
In a particular embodiment, calibrating installation is fixed on testing stand by fixture during detection, on-test is by track
Tester calibrating installation dislocation is on the testing stand of wheel rutting test machine, and experiment wheel is in the central portion of vehicle tracking test instrument calibrating installation
Position, starts rutting deformation automatic recording instrument, then firing test instrument, experiment wheel is made to go and back running in 9 upper surface of pressing plate, vertical to make
Firmly on force value sensor 8, the force value of record experiment wheel application, planetary reducing motor 2 drives inner support component 7, force value to pass
Sensor 8, pressing plate 9 move downward, and induction area between the B faces of component 7 and the A faces of component 1 is caused to change, passes through sensitive surface
The variation of product S causes the variation of capacitance, then the variation of capacitance is converted into electric signal (variation of frequency) by detection circuit
Carry out the displacement of 9 upper surface of measuring part decline.Temperature Humidity Sensor measures the temperature change of experiment process in real time.When displacement reaches
Off-test during 25mm, time about 30min.During experiment, vehicle tracking test instrument and vehicle tracking test instrument calibrating installation record simultaneously
Test data.Finally compare the test data of the two, draw the data such as the deviation of vehicle tracking test instrument.
The simulation pitch test block of vehicle tracking test instrument calibrating installation carries out testing while detecting record temperature, force value and displacement ginseng
Number.
In the present embodiment, further include：Pressure sensor is arranged on testing stand, for examining testing wheel ground connection pressure；It rubs
Force snesor is wiped, is arranged on the clamp surface, for testing examination wheel and the platen surface frictional force；Velocity sensor,
It is arranged on the clamp surface, and wheel movement rate is tried for measuring；Examination wheel controller is arranged on examination wheel axle center, for controlling
The experiment displacement of system examination wheel；
Controller, is bolted on the base groove bottom, and the controller is internally provided with integrated power detection
Unit, temperature detecting unit, displacement control unit and Bluetooth transmission unit, and connect friction force sensor, velocity sensor, pressure
Force snesor, detection circuit, examination wheel controller, for receiving the detection data of the sensor and examination wheel controller, control inspection
Slowdown monitoring circuit, motor and examination wheel displacement.
The present invention also provides the control method that a kind of vehicle tracking test instrument detects automatically, when vehicle tracking test instrument detects automatically
Examination wheel displacement and detection circuit voltage are adjusted based on BP neural network, included the following steps：
Step 1: establish BP neural network model；
For the BP network architecture that the present invention uses by up of three layers, first layer is input layer, common n node, corresponding
Represent n detection signal of equipment working state, these signal parameters are provided by data preprocessing module.The second layer is hidden layer,
Common m node is determined in an adaptive way by the training process of network.Third layer is output layer, common p node, by system
Actual needs output in response to determining that.
The mathematical model of the network is：
Input layer vector：X=(x1,x2,…,xn)T
Interlayer vector：Y=(y1,y2,…,ym)T
Output layer vector：Z=(z1,z2,…,zp)T
In the present invention, input layer number is 5, and output layer number of nodes is p=2.Hidden layer number of nodes m is estimated by following formula
Go out：
According to the sampling period, 5 parameters of input are：x1For temperature coefficient, x2For humidity coefficient, x3For examination wheel pressure system
Number, x4For examination wheel and clamp surface friction coefficient, x5Movement initial velocity rate coefficient is taken turns for examination；
Since the data that sensor obtains belong to different physical quantitys, dimension is different.Therefore, god is inputted in data
Through network before, it is necessary to which data requirement to be turned to the number between 0-1.
Specifically, for temperature T, after being standardized, temperature coefficient x is obtained1：
Wherein, Δ TminWith Δ TmaxThe minimum value and maximum of difference in height respectively between camera.
Likewise, to humidity H, after being standardized, humidity coefficient x is obtained2：
Wherein, HminAnd HmaxMinimum humidity and maximal humidity respectively in test process.
Pressure P is taken turns to examination, after being standardized, obtains examination wheel pressure coefficient x3：
Wherein, PminAnd PmaxMost lab scale wheel ground connection pressure and maximum examination wheel ground connection pressure respectively in test process.
To examination wheel and clamp surface frictional force f, after being standardized, examination wheel friction of motion force coefficient x is obtained4：
Movement first rate V is taken turns to examination, after being standardized, obtains speed coefficient x5：
Wherein, VminAnd VmaxThe respectively minimum first rate of examination wheel movement and maximum first rate.
2 parameters of output signal are expressed as：z1The adjustment factor of experiment displacement, z are taken turns for examination2For detection circuit
Voltage regulation coefficient；
Examination wheel experiment displacement adjustment factor z1The experiment displacement of examination wheel and the present sample being expressed as in next sampling period
The ratio between maximum displacement set in cycle, i.e., in the ith sample cycle, the examination wheel experiment displacement collected isPass through BP
The examination wheel experiment displacement adjustment factor s in neutral net output ith sample cycle1 iAfterwards, i+1 sampling period pilot scale wheel is controlled
Testing displacement isMake its satisfaction
The voltage regulation coefficient z of detection circuit2Be expressed as the voltage of the detection circuit in next sampling period with it is current
The ratio between maximum voltage set in sampling period, i.e., in the ith sample cycle, the voltage of the detection circuit collected is
The second camera height adjustment factor z in ith sample cycle is exported by BP neural network2 iAfterwards, the i+1 sampling period is controlled
The voltage of middle detection circuit isMake its satisfaction
Step 2：Carry out the training of BP neural network.
After establishing BP neural network nodal analysis method, you can carry out the training of BP neural network.According to the experience number of product
According to the sample for obtaining training, and give the connection weight w between input node i and hidden layer node jij, hidden node j and output
Connection weight w between node layer kjk, the threshold θ of hidden node jj, the threshold value w of output node layer kij、wjk、θj、θkIt is -1
Random number between to 1.
In the training process, w is constantly correctedijAnd wjkValue, until systematic error be less than or equal to anticipation error when, complete
The training process of neutral net.
As shown in table 1, given the value of each node in one group of training sample and training process.
Each nodal value of 1 training process of table
Step 3: gathered data operating parameter input neutral net is regulated coefficient；
Trained artificial neural network is solidificated among chip, and hardware circuit is made to possess prediction and intelligent decision function,
So as to form Intelligent hardware.Intelligent hardware power-up start after, vehicle tracking test instrument automatic checkout system brings into operation, examination wheel experiment with
Maximum displacement brings into operation, the voltage max of detection circuit, i.e. examination wheel experiment initial displacement s0=0.87smax, test circuit
Initial voltage E0=0.88Emax；
Meanwhile use sensor measurement initial temperature TO, initial humidity coefficient H0, examination wheel be grounded initial pressure P0, examination wheel fortune
Dynamic initial frictional fO, examination wheel movement first rate VO, by the way that above-mentioned parameter is standardized, obtain the initial input of BP neural network
VectorInitial output vector is obtained by the computing of BP neural network
Step 4：Examination wheel experiment displacement, detection circuit voltage；Obtain initial output vectorAfterwards, you can adjust
Section examination wheel experiment displacement, detection circuit voltage, the examination wheel experiment of the height for making next sampling period lifting device, device of drenching with rain
Displacement, detection circuit voltage are respectively：
s1=z1 0smax
E1=z2 0Emax
Temperature T, humidity H in the ith sample cycle, examination wheel pressure P, the surface of examination wheel and pressing plate are obtained by sensor
Frictional force f, examination wheel movement first rate V, by being standardized to obtain the input vector x in ith sample cyclei=(x1 i,x2 i,
x3 i,x4 i,x5 i), the output vector z in ith sample cycle is obtained by the computing of BP neural networki=(z1 i,z2 i), then control
System, which is adjusted, tries wheel experiment displacement, detection circuit voltage, and examination wheel tests displacement, detection circuit voltage when making the i+1 sampling period
Respectively：
si+1=z1 ismax,
Ei+1=z2 iEmax,
By above-mentioned setting, by the real-time detection temperature of sensor, humidity, examination wheel pressure, examination wheel and the surface of pressing plate are rubbed
Power is wiped, examination wheel movement first rate by using BP neural network algorithm, takes turns examination experiment displacement, detection circuit voltage is adjusted
Control, reaches optimal operating status, so as to improve operational efficiency.
Although the embodiments of the present invention have been disclosed as above, but its be not restricted in specification and embodiment it is listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, it is of the invention and unlimited
In specific details and shown here as the legend with description.
Claims (10)
1. a kind of vehicle tracking test instrument automatic detection device, which is characterized in that including：
Square pedestal, upper surface are coaxially provided with cylindrical recesses, and being uniformly provided with multiple columns close to circumferential edge in the groove leads
Column；
Turbine and worm retarder is installed among the groove, and the turbine and worm retarder upper surface center is equipped with coding
Device；
Hollow disc shape support member, is equipped with and the columnar through holes that match of the guide post, with the pedestal it is coaxial, can be upper and lower
It is actively set on the guide post；
Butterfly force value sensor is installed in by thread bush above the encoder；
Multiple wire Temperature Humidity Sensors, four that the pedestal is located in lower end are diagonal.
2. vehicle tracking test instrument automatic detection device according to claim 1, which is characterized in that further include：
Column planetary reducing motor is installed in the base groove bottom by bolt, and pass through shaft coupling be installed in it is described
One side surface of turbine and worm retarder.
3. vehicle tracking test instrument automatic detection device according to claim 1, which is characterized in that the turbine and worm retarder
For quadrangular shape, centre of surface is equipped with cylindrical boss thereon, and the catercorner length of the turbine and worm retarder is less than described
Support member.
4. vehicle tracking test instrument automatic detection device according to claim 3, which is characterized in that further include：
The encoder center is equipped with circular through hole, and the circular through hole is set on the boss.
5. vehicle tracking test instrument automatic detection device according to claim 1, which is characterized in that
Detection circuit is arranged in the base groove, connects the groove medial surface and the support member lateral surface.
6. vehicle tracking test instrument automatic detection device according to claim 1, it is characterised in that：
The outer diameter of the support member is less than the radius of the groove, and the internal diameter of the support member is more than the force value sensor
Outer diameter.
7. vehicle tracking test instrument automatic detection device according to claim 1, which is characterized in that further include：Disk pressing plate,
It is co-axially located at the top of the force value sensor.
8. according to the vehicle tracking test instrument automatic detection device described in claim 1-7 any one, which is characterized in that further include：
Friction force sensor is arranged on the clamp surface, for testing examination wheel and the platen surface frictional force；
Velocity sensor is arranged on the clamp surface, and wheel movement rate is tried for measuring；
Examination wheel controller is arranged on examination wheel axle center, for controlling the experiment displacement of examination wheel；
Controller, is bolted on the base groove bottom, the controller be internally provided with integrated power detection unit,
Temperature detecting unit, displacement control unit and Bluetooth transmission unit, and connect the friction force sensor, velocity sensor, pressure
Force snesor, detection circuit, examination wheel controller, for receiving the data of the sensor and examination wheel controller, control detection electricity
Road, motor and examination wheel displacement.
9. the control method that a kind of vehicle tracking test instrument detects automatically, which is characterized in that be based on when vehicle tracking test instrument detects automatically
BP neural network adjusts examination wheel displacement and detection circuit voltage, includes the following steps：
Step 1: according to the sampling period, pass through sensor collecting temperature T, humidity H, examination wheel pressure P, the surface of examination wheel and pressing plate
Frictional force f, examination wheel movement first rate V；
Step 2: successively by temperature T, humidity H, examination wheel pressure P, examination takes turns and the skin-friction force f of pressing plate, examination wheel movement first rate
V standardizes, and determines input layer vector x={ x of three layers of BP neural network1,x2,x3,x4,x5}；Wherein, x1For temperature system
Number, x2For humidity coefficient, x3Pressure coefficient, x are taken turns for examination4For examination wheel and clamp surface friction coefficient, x5Movement initial velocity is taken turns for examination
Rate coefficient；
Step 3: the input layer DUAL PROBLEMS OF VECTOR MAPPING is to interlayer, the interlayer vector y={ y1,y2,…,ym}；M is interlayer
Node number；
Step 4: obtain output layer vector z={ z1,z2}；Wherein z1The adjustment factor of experiment displacement, z are taken turns for examination2For detection circuit
Voltage regulation coefficient, make
si+1=z1 ismax,
Ei+1=z2 iEmax,
Wherein, z1 i、z2 iRespectively ith sample cycle output layer vector parameter, smax、EmaxThe maximum of the examination wheel respectively set
The maximum voltage of displacement, detection circuit；And
In the step 2, temperature T, humidity H, examination wheel pressure P, examination takes turns and the skin-friction force f of pressing plate, examination wheel movement initial velocity
Rate V carries out normalization formulae formula：
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<mo>=</mo>
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<mo>,</mo>
<mi>j</mi>
<mo>=</mo>
<mn>1</mn>
<mo>,</mo>
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<mn>3</mn>
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<mn>4</mn>
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</mrow>
Wherein, xjFor the parameter in input layer vector, XjRespectively measurement parameter T, H, P, f, V, j=1,2,3,4,5；XjmaxWith
XjminMaximum and minimum value in respectively corresponding measurement parameter.
10. the control method that vehicle tracking test instrument according to claim 9 detects automatically, which is characterized in that in the step
In one, under initial operating state, examination wheel experiment displacement, detection circuit voltage meet empirical value：
s0=0.87smax,
E0=0.88Emax,
Wherein, s0、E0Initial trial displacement, the initial voltage of detection circuit are taken turns in the examination respectively set；smax、EmaxRespectively set
Fixed examination wheel is maximum to test displacement, the maximum voltage of detection circuit.
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