CN108519501B - Sliding time detector, calibrating device for non-contact speedometer and calibrating method - Google Patents
Sliding time detector, calibrating device for non-contact speedometer and calibrating method Download PDFInfo
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- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a sliding time detector, a calibrating device for a non-contact speedometer and a calibrating method, wherein the calibrating device comprises a base, a shell and a checking and detecting mechanism, the checking and detecting mechanism is arranged on the base and in the shell and comprises a frequency converter, a motor, a test roller, an encoder and a controller, the encoder is used for monitoring the real-time rotating speed of the test roller, and the encoder is used for realizing closed-loop control of the frequency converter to the motor; the shell is provided with a test window, the test window is arranged corresponding to the wall of the test roller, and the outer circular surface of the wall is formed by splicing knurling and reflecting surfaces left and right; the sliding time detector to be calibrated is arranged above the test window through the magnetic support, and is in close contact with the knurled surface of the cylinder wall without relative sliding; the non-contact speedometer to be calibrated is arranged above the test window through the mounting bracket, and a probe of the non-contact speedometer to be calibrated faces the reflecting surface of the cylinder wall; the controller is also connected with an external upper computer.
Description
Technical Field
The invention relates to the technical field of calibration of a sliding time detector, in particular to a calibration device and a calibration method of the sliding time detector.
Background
The sliding time detector is mainly used for measuring the sliding time of a sliding test of the chassis dynamometer for detecting the exhaust pollutants of the automobile, and calibrating parameters such as basic inertia, constant loading sliding time, variable loading sliding time and the like of the chassis dynamometer for detecting the exhaust pollutants of the automobile by comparing the sliding time with the theoretical sliding time. The sliding time detector mainly comprises a contact type speed sampler and a data control processing part. The contact type speed sampler is a rotating wheel with a photoelectric sensor, when in use, the rotating wheel of the contact type sampler is reliably contacted with a roller of a chassis dynamometer for detecting exhaust pollutants of a detected automobile, and when the roller of the chassis dynamometer for detecting exhaust pollutants of the automobile rotates, the rotating wheel of the contact type speed sampler of the sliding time detector is driven to rotate by virtue of friction force, so that the photoelectric encoder is driven to rotate. The speed of the chassis dynamometer roller for detecting the exhaust pollutants of the automobile can be calculated by measuring the pulse signal frequency sent by the photoelectric encoder, and the time used for the sliding test in different speed intervals can be recorded, namely the sliding time.
The national III standard requires that the chassis dynamometer is used for simulating various road conditions of vehicle running for measuring the exhaust pollutants of the automobile, and the main indexes of the chassis dynamometer for detecting the tail gas of the automobile, such as basic inertia, constant loading sliding time, variable loading sliding time, parasitic power and the like, are all measured by measuring the sliding time. Currently, automobile exhaust emission detection is commonly performed in various provinces in China, and a sliding time detector is a metering instrument with important significance for automobile exhaust detection. At present, a plurality of manufacturers in China develop and produce a sliding time tester, all provincial metering technical institutions in China, and chassis dynamometer manufacturers for environmental protection emission equipment acceptance mechanisms and automobile emission are all required to use the equipment for calibration acceptance.
However, at present, no detection device for detecting the speed error of the sliding time detector exists, and a set of calibrating device for the sliding time detector needs to be developed urgently, so that the accuracy of the sliding time detector is effectively ensured.
The non-contact speedometer is one of the most important and most commonly used detection devices for automobile performance test, and is a measuring instrument for measuring parameters such as the running speed and the running distance of an automobile. The microcomputer is used as core component, photoelectric sensor and related filtering technology are adopted, and matched with correspondent I/O interface, the irregular specific reflection speckle image on the road surface is collected, converted into frequency signal, and converted into digital quantity by A/D conversion, and fed into computer, and the vehicle speed V, driving distance S, acceleration time t and oil consumption, etc. can be calculated by means of correspondent formula, and displayed.
Currently, the methods for confirming the measurement accuracy of the non-contact automobile speedometer are only two methods, namely a road detection method and a drum detection method. The road detection method is to select a straight road surface with 1km, and set a trigger point with a certain distance between the two road surfaces, and the conditions are harsh. Since it is difficult for the driver to ensure "steady speed" at the time of actual control, there are too many factors affecting the accuracy of the measurement result. The "drum test" is to manufacture a drum which rotates at different prescribed rotational speeds to produce different linear speeds for testing the accuracy of the car speedometer. The method has large investment, huge structure and incapability of performing on-site detection, and the unreliability of the measurement result is brought because the reflection plane of 80cm and 100cm required by irradiation of the photoelectric head of the detected automobile speedometer cannot be ensured.
Disclosure of Invention
The invention aims to provide a sliding time detector, a calibrating device for a non-contact speedometer and a calibrating method, which can comprehensively and integrally calibrate the sliding time detector and the non-contact speedometer and ensure the calibrating accuracy.
The invention adopts the technical scheme that:
the utility model provides a calibrating device for time of sliding detector and non-contact speedometer, including the base, casing and check-up detection mechanism, check-up detection mechanism sets up on the base, in the casing, check-up detection mechanism includes the converter, a motor, test cylinder, encoder and controller, the controlled end of converter is connected to the control end of controller, the controlled end of motor is connected to the control end of converter, the center pin of test cylinder is passed through to the output shaft of motor, the encoder moves with the center pin of test cylinder in step, the center pin of test cylinder sets up horizontally, the signal output part of encoder connects the feedback receiving terminal of converter and the feedback receiving terminal of controller respectively; the encoder is used for monitoring the real-time rotating speed of the test roller, and the encoder realizes closed-loop control of the frequency converter to the motor;
The base include the bottom frame and establish many keels on the frame, check-up detection mechanism fixes on many keels, and the output shaft of motor and the center pin of test cylinder are on same horizontal axis.
The shell is provided with a test window, the test window is arranged corresponding to the wall of the test roller, and the outer circular surface of the wall is formed by splicing knurling and reflecting surfaces left and right; the sliding time detector to be calibrated is arranged above the test window through the magnetic support, and is in close contact with the knurled surface of the cylinder wall without relative sliding; the non-contact speedometer to be calibrated is arranged above the test window through the mounting bracket, and a probe of the non-contact speedometer to be calibrated faces the reflecting surface of the cylinder wall;
the controller is also connected with an external upper computer.
The test roller comprises a cylinder wall, a central shaft and balance discs, wherein 2-4 balance discs are radially arranged between the central shaft and the cylinder wall, and 2-4 balance discs are uniformly arranged along the axial direction at intervals.
And a plurality of through holes are uniformly distributed on each balance disc.
The magnetic force support locate on the casing, by the test window, the magnetic force support includes rear end open-ended mounting box, is equipped with spacing screw on the mounting box, the cooperation is equipped with the spacer pin for fixed waiting to calibrate the time of sliding detector.
The mounting bracket comprises a portal frame and a mounting seat, wherein the mounting seat is fixed on an upper beam of the portal frame, the mounting seat is arranged above a reflecting surface of the wall of the portal frame, and the non-contact speedometer is arranged in the mounting seat.
The encoder adopts a rotary encoder.
A method for calibrating a slide time detector of a calibrating device for a non-contact speedometer comprises the following steps:
a: fixing the sliding time detector to be calibrated on the shell by utilizing a magnetic support, so that a rotating wheel of a contact type speed sampler of the sliding time detector to be calibrated is in contact with a knurled surface of the test roller, and no relative sliding or jumping exists;
b: setting the initial rotation speed v of the motor through the upper computer 0 The controller sends information to the frequency converter, the frequency converter controls the motor to operate, and meanwhile, the rotary encoder monitors the real-time rotating speed of the test roller and feeds back the real-time rotating speed to the frequency converter and the controller to correct the rotating speed of the motor in real time, so that the motor outputs a constant initial rotating speed v 0 The unit is km/h; recording a speed value vn displayed by a sliding time detector to be calibrated, wherein the unit is km/h;
c: repeating the step B for three times, and respectively recording the speed values v1, v2 and v3 displayed by the sliding time detector to be calibrated, wherein the unit is km/h; and calculating the speed measurement error of each time by using the formula (1), wherein the formula (1) is as follows:
The calculation result is as follows: Δv1, Δv2, Δv3;
d: comparing Deltav 1, deltav 2 and Deltav 3 in the step C, and taking the maximum value as an error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result; wherein, the maximum allowable error is: when the initial rotation speed v 0 When the maximum allowable error is 0.1 km/h-20 km/h, the maximum allowable error is +/-0.04 km/h; when the initial rotation speed v 0 When the maximum allowable error is 20km/h to 130km/h, the maximum allowable error is +/-0.2 percent km/h;
e: speed measurement error calibration with test points of 30km/h, 5km/h, 20km/h, 50km/h and 100km/h is performed below:
(1) When the test point is 30km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at 30km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(2) When testingAt a point of 5km/h, i.e. v 0 Repeating step B three times, recording the initial speed v of the slide time detector to be calibrated 0 The speed values v1, v2, v3 displayed at 5km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(3) When the test point is 20km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at =20km/h, and then the speed measurement errors Δv1, Δv2, Δv3 are calculated according to formula (1), respectively, taking the maximum value as the error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(4) When the test point is 50km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at=50 km/h, and then the speed measurement errors Δv1, Δv2, Δv3 are calculated according to formula (1), respectively, taking the maximum value as the error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(5) When the test point is 100km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at 100km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
F: and E, tabulating and outputting the calibration result under each test point in the step E.
A calibrating method of a non-contact speedometer of a calibrating device for a non-contact speedometer and a sliding time detector comprises the following steps:
a: fixing the non-contact speedometer to be calibrated above the reflecting surface of the upper test roller by using a mounting bracket, and performing preheating treatment;
b: setting the sliding time detector, the calibrating device for the non-contact speedometer and the non-contact speedometer to be calibrated in a detection state, and setting the initial rotating speed v of the motor through an upper computer 0 The controller sends information to the frequency converter, the frequency converter controls the motor to operate, meanwhile, the real-time rotating speed of the test roller is monitored through the rotary encoder and fed back to the frequency converter and the controller, the rotating speed of the motor is corrected in real time, and the motor outputs a constant initial rotating speed v 0 The method comprises the steps of carrying out a first treatment on the surface of the Then, the motor rotating speed is gradually regulated to 180km/h, whether the display of the non-contact speedometer to be calibrated is normal or not is observed, and the testing range of the non-contact speedometer to be calibrated is detected; if the non-contact speedometer to be calibrated is displayed normally, performing the next step;
c: speed indication error calibration:
c1, the motor outputs a constant test rotating speed v through the step b b And reads the speed indication v of the non-contact speedometer to be calibrated i Repeating for three times to obtain three speed indication values v i1 、v i2 、v i3 The method comprises the steps of carrying out a first treatment on the surface of the And calculate the average value of three speed indication values
c2, calculating an indication error:
when testing the rotating speed v b When the maximum allowable error Deltav is not more than 50km/h 0 The error of the indication value is calculated according to the formula (3) by the method of the combination of the two,
wherein Deltav i : when the i test point is the ith test point, indicating value errors of the non-contact speedometer to be calibrated are i=1 and 2; when testing the rotating speed v b When the maximum allowable error Deltav is greater than 50km/h 0 The error of the indication value is calculated according to the formula (4) by the method of the combination of the two,
in the formula δv i : when the i test point is the ith test point, indicating value errors of the non-contact speedometer to be calibrated are i=3, 4, 5 and 6;
d: the following is carried out according to the step c, wherein the speed indication errors of the test points are 10km/h, 30km/h, 60km/h, 90km/h, 120km/h and 180km/h, and the corresponding serial numbers are i=1, 2, 3, 4, 5 and 6:
d1, when the test point is 10km/h, i.e. v b =10 km/h, repeat step c; according to the formula (3), when i is equal to 1, calculating the error Deltav of the velocity indication 1 Then the error Deltav of the speed indication value is calculated 1 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.1km/h, thereby obtaining a calibration result;
d2, when the test point is 30km/h, i.e. v b =30 km/h, repeat step c; according to the formula (3), when i is equal to 2, calculating the error Deltav of the velocity indication 2 Then the error Deltav of the speed indication value is calculated 2 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.1km/h, thereby obtaining a calibration result;
d3, when the test point is 60km/h, i.e. v b =60 km/h, repeat step c; according to the formula (4), when i is equal to 3, calculating the error Deltav of the velocity indication 3 Then the error Deltav of the speed indication value is calculated 3 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 90km/h, i.e. v b =90 km/h, repeat step c; according to the formula (4), when i is equal to 4, calculating the speed indication error Deltav 4 Then the error Deltav of the speed indication value is calculated 4 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 120km/h, i.e. v b =120 km/h, repeat step c; according to the formula (4), when i is equal to 5, calculating the error Deltav of the velocity indication 5 Then the error Deltav of the speed indication value is calculated 5 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 180km/h, i.e. v b =180 km/h, repeat step c; according to the formula (4), when i is equal to 6, calculating the speed indication error Deltav 6 Then the error Deltav of the speed indication value is calculated 6 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
e: performing distance indication error calibration with test points of 25m and 100 m:
e1: when the calibration distance is 25m, the rotating speed of the motor is set to be 30km/h, after the speed is stable, the synchronous metering distance between the test roller and the speedometer is ensured, and the distance indication value of the motor and the speedometer is read; repeating the measurement for 3 times, and recording;
when the distance is not more than 30m, calculating a distance indication error according to formula (5),
wherein Δs j ＝s j -s Aj (6)
In the formula (5) and the formula (6), Δs: distance indication error of the non-contact speedometer to be calibrated;
Δs j : when the j-th measurement is carried out, the distance indication error of the non-contact speedometer is to be calibrated;
s j : when the j-th measurement is carried out, the distance indication value of the non-contact speedometer to be calibrated;
s Aj when the j-th measurement is carried out, the distance of the motor is displayed;
e2: when the calibration distance is 100m, the rotating speed of the motor is set to be 100km/h, after the speed is stable, the synchronous metering distance between the test roller and the speedometer is ensured, and the distance indication value of the motor and the speedometer is read; repeating the measurement for 3 times, and recording;
when the distance is greater than 30m, calculating a distance indication error according to a formula (7);
wherein->
δs in the formula (7) and the formula (8): distance indication error of the non-contact speedometer to be calibrated;
δs j : when the j-th measurement is carried out, the distance indicating value error of the non-contact speedometer to be calibrated is j=1, 2 and 3;
s j : when the j-th measurement is carried out, the distance indication value of the non-contact speedometer to be calibrated;
s Aj when the j-th measurement is carried out, the distance of the motor is displayed;
in summary, according to the formula (5) and the formula (7), the distance indication errors of which the test points are 25m and 100m are obtained;
f: and d, tabulating and outputting the calibration result under each test point in the steps d and e.
The invention inputs corresponding test parameters (speed and the like) on a computer upper computer, processes and outputs a data instruction to a frequency converter through a controller, controls the output of a motor through the frequency converter, and the motor is rigidly and directly connected with a test roller through a coupler, monitors the rotating speed of the test roller by using a rotary encoder and feeds back to the frequency converter, performs closed-loop control on the rotating speed of the roller, obtains stable speed, and reads the stable speed to be displayed by a computer in real time.
Furthermore, the standard calibration error value is utilized to calibrate the speed indication value of the measured sliding time detector, and meanwhile, the speed and the distance of the non-contact speedometer can be calibrated, so that the integrated use of one machine and two calibration is achieved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention;
FIG. 3 is a schematic block diagram of the circuit of the present invention;
FIG. 4 is a schematic view of the structure of the test drum of the present invention;
fig. 5 is an axial cross-sectional view of the test cylinder of the present invention.
Detailed Description
As shown in fig. 1, 2 and 3, the invention comprises a base, a casing 6 and a checking and detecting mechanism, wherein the checking and detecting mechanism is arranged on the base and in the casing. The base include bottom frame 1 and establish many fossil fragments 2 on the frame, check-up detection mechanism fixes on many fossil fragments 2, and the output shaft of motor 3 and the center pin 5 of test cylinder 4 are on same horizontal axis. The shell 6 is provided with a test window 7, the test window 7 is arranged corresponding to the cylinder wall 4c of the test cylinder 4, and the outer circular surface of the cylinder wall 4c is formed by splicing a knurled surface 4a and a reflecting surface 4b left and right; the sliding time detector 8 to be calibrated is arranged above the test window 7 through a magnetic bracket, and the sliding time detector 8 to be calibrated is in close contact with the knurled surface 4a of the cylinder wall 4c without relative sliding; the non-contact speedometer 9 to be calibrated is arranged above the test window 7 through a mounting bracket, and a probe of the non-contact speedometer 9 to be calibrated faces the reflecting surface 4b of the cylinder wall 4 c.
The verification detection mechanism comprises a frequency converter 10, a motor 3, a test roller 4, an encoder 11 and a controller 12, wherein the control end of the controller 12 is connected with the controlled end of the frequency converter 10, the control end of the frequency converter 10 is connected with the controlled end of the motor 3, the output shaft of the motor 3 is connected with the central shaft 5 of the test roller 4 through a coupling, the encoder 11 and the central shaft 5 of the test roller 4 synchronously run, the central shaft 5 of the test roller 4 is horizontally arranged, and the signal output end of the encoder 11 is respectively connected with the feedback receiving end of the frequency converter 10 and the feedback receiving end of the controller 12; the encoder 11 is used for monitoring the real-time rotating speed of the test roller 4, and the encoder 11 realizes the closed-loop control of the frequency converter 10 to the motor 3 by the frequency converter 10; the controller 12 is also connected to an external host computer.
As shown in fig. 4 and 5, the test roller 4 includes a cylinder wall 4c, a central shaft 5 and balance discs 4d,2-4 balance discs 4d are radially disposed between the central shaft 5 and the cylinder wall 4c, and 2-4 balance discs 4d are uniformly disposed along an axial direction at intervals, and a plurality of through holes 4e are uniformly distributed on each balance disc 4 d. The magnetic force support locate on the casing 6, by the test window 7, the magnetic force support includes rear end open-ended mounting box 13, is equipped with spacing screw on the mounting box 13, the cooperation is equipped with spacer pin 14 for fixed waiting to calibrate the time of sliding detector 8. The mounting bracket comprises a portal frame 15 and a mounting seat 16, wherein the mounting seat 16 is fixed on an upper beam of the portal frame 15, the mounting seat 16 is arranged above the reflecting surface 4b of the cylinder wall 4c, and the non-contact speedometer 9 is arranged in the mounting seat 16. The encoder 11 is a rotary encoder 11.
The method for calibrating the slide time detector 8 based on the slide time detector 8 and the calibrating device for the non-contact speedometer 9 is characterized in that: the method comprises the following steps:
a: the sliding time detector 8 to be calibrated is fixed on the shell 6 by utilizing a magnetic support, so that a rotating wheel of a contact type speed sampler of the sliding time detector 8 to be calibrated is contacted with the knurled surface 4a of the test roller 4, and no relative sliding or jumping exists;
b: setting the initial rotation speed v of the motor 3 through the upper computer 0 The controller 12 sends information to the frequency converter 10, the frequency converter 10 controls the motor 3 to operate, and simultaneously, the rotary encoder 11 monitors the real-time rotating speed of the test roller 4, and feeds back the real-time rotating speed to the frequency converter 10 and the controller 12, and the rotating speed of the motor 3 is corrected in real time, so that the motor 3 outputs a constant initial rotating speed v 0 The unit is km/h; and records the speed value vn displayed by the sliding time detector 8 to be calibrated, wherein the unit is km/h;
c: repeating the step B for three times, and respectively recording the speed values v1, v2 and v3 displayed by the sliding time detector 8 to be calibrated, wherein the unit is km/h; and calculating the speed measurement error of each time by using the formula (1), wherein the formula (1) is as follows:
the calculation result is as follows: Δv1, Δv2, Δv3;
d: comparing Deltav 1, deltav 2 and Deltav 3 in the step C, and taking the maximum value as an error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result; wherein, the maximum allowable error is: when the initial rotation speed v 0 When the maximum allowable error is 0.1 km/h-20 km/h, the maximum allowable error is +/-0.04 km/h; when the initial rotation speed v 0 When the maximum allowable error is 20km/h to 130km/h, the maximum allowable error is +/-0.2 percent km/h;
e: speed measurement error calibration with test points of 30km/h, 5km/h, 20km/h, 50km/h and 100km/h is performed below:
(1) When the test point is 30km/h, i.e. v 0 Step B is repeated three times, each recording the initial velocity v of the taxiing time detector 8 to be calibrated 0 The speed values v1, v2, v3 displayed at 30km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(2) When the test point is 5km/h, i.e. v 0 Step B is repeated three times, each recording the initial velocity v of the taxiing time detector 8 to be calibrated 0 The speed values v1, v2, v3 displayed at 5km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(3) When the test point is 20km/h, i.e. v 0 Step B is repeated three times, each recording the initial velocity v of the taxiing time detector 8 to be calibrated 0 The speed values v1, v2, v3 displayed at =20km/h, and then the speed measurement errors Δv1, Δv2, Δv3 are calculated according to formula (1), respectively, taking the maximum value as the error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(4) When the test point is 50km/h, i.e. v 0 Step B is repeated three times, each recording the initial velocity v of the taxiing time detector 8 to be calibrated 0 The speed values v1, v2, v3 displayed at=50 km/h, and then the speed measurement errors Δv1, Δv2, Δv3 are calculated according to formula (1), respectively, taking the maximum value as the error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(5) When the test point is 100km/h, i.e. v 0 Step B is repeated three times, each recording the initial velocity v of the taxiing time detector 8 to be calibrated 0 Velocity values v1, v2, v3 shown at 100km/h, and velocity measurement errors Δv1 and Δv1 are calculated according to equation (1), respectivelyv2, Δv3, taking the maximum value as an error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
f: and E, tabulating and outputting the calibration result under each test point in the step E.
The method for calibrating the non-contact speedometer 9 by the calibration device for the non-contact speedometer 9 and the slide time detector 8 is characterized in that: the method comprises the following steps:
a: fixing a non-contact speedometer 9 to be calibrated above the reflecting surface 4b of the upper test roller 4 by using a mounting bracket, and performing preheating treatment;
b: the sliding time detector 8 and the non-contact speedometer 9 are placed in a detection state by a calibrating device and the non-contact speedometer 9 to be calibrated, and the initial rotation speed v of the motor 3 is set by an upper computer 0 The controller 12 sends information to the frequency converter 10, the frequency converter 10 controls the motor 3 to operate, and simultaneously, the real-time rotation speed of the test drum 4 is monitored through the rotary encoder 11 and fed back to the frequency converter 10 and the controller 12, the rotation speed of the motor 3 is corrected in real time, so that the motor 3 outputs a constant initial rotation speed v 0 The method comprises the steps of carrying out a first treatment on the surface of the Then, the rotating speed of the motor 3 is gradually regulated to 180km/h, whether the display of the non-contact speedometer 9 to be calibrated is normal or not is observed, and the testing range of the non-contact speedometer 9 to be calibrated is detected; if the non-contact speedometer 9 to be calibrated is displayed normally, the next step is carried out;
c: speed indication error calibration:
c1, the motor 3 outputs a constant test rotational speed v by means of step b b And reads the speed indication v of the non-contact speedometer 9 to be calibrated i Repeating for three times to obtain three speed indication values v i1 、v i2 、v i3 The method comprises the steps of carrying out a first treatment on the surface of the And calculate the average value of three speed indication values
c2, calculating an indication error:
when testing the rotating speed v b When the maximum allowable error Deltav is not more than 50km/h 0 The ratio of the total length of the cable to the total length of the cable is = + -0.1 km/h, which is obtained according to the formula (3)The error of the indication value is displayed,
wherein Deltav i : when the i test point is the i test point, the indicating value error of the non-contact speedometer 9 to be calibrated is i=1 and 2;
when testing the rotating speed v b When the maximum allowable error Deltav is greater than 50km/h 0 The error of the indication value is calculated according to the formula (4) by the method of the combination of the two,
in the formula δv i : when the i test point is the i test point, the indicating value error of the non-contact speedometer 9 to be calibrated is i=3, 4, 5 and 6;
d: the following is carried out according to the step c, wherein the speed indication errors of the test points are 10km/h, 30km/h, 60km/h, 90km/h, 120km/h and 180km/h, and the corresponding serial numbers are i=1, 2, 3, 4, 5 and 6:
d1, when the test point is 10km/h, i.e. v b =10 km/h, repeat step c; according to the formula (3), when i is equal to 1, calculating the error Deltav of the velocity indication 1 Then the error Deltav of the speed indication value is calculated 1 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.1km/h, thereby obtaining a calibration result;
d2, when the test point is 30km/h, i.e. v b =30 km/h, repeat step c; according to the formula (3), when i is equal to 2, calculating the error Deltav of the velocity indication 2 Then the error Deltav of the speed indication value is calculated 2 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.1km/h, thereby obtaining a calibration result;
d3, when the test point is 60km/h, i.e. v b =60 km/h, repeat step c; according to the formula (4), when i is equal to 3, calculating the error Deltav of the velocity indication 3 Then the error Deltav of the speed indication value is calculated 3 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 90km/h, i.e. v b =90 km/h, repeat step c; according to the formula (4), when i is equal to 4, calculating the speed indication error Deltav 4 Then the error Deltav of the speed indication value is calculated 4 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 120km/h, i.e. v b =120 km/h, repeat step c; according to the formula (4), when i is equal to 5, calculating the error Deltav of the velocity indication 5 Then the error Deltav of the speed indication value is calculated 5 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 180km/h, i.e. v b =180 km/h, repeat step c; according to the formula (4), when i is equal to 6, calculating the speed indication error Deltav 6 Then the error Deltav of the speed indication value is calculated 6 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
e: and d, tabulating and outputting the calibration result under each test point in the step d.
The working principle of the invention is described below with reference to the accompanying drawings:
the device inputs corresponding test parameters (such as speed) on a computer upper computer according to test requirements, processes and outputs data instructions to a frequency converter through a controller, controls motor output through the frequency converter, and is directly connected with a test roller through a coupler.
Wherein, the length of the roller is 300mm, the 150mm knurling treatment meets the detection of the sliding time, and the 150mm excircle turning treatment meets the detection of a non-contact speedometer. A cast aluminum cylinder with a diameter of 360mm and a width of 300mm has an inertia of about 0.2 kg.m2. The basic calculation formula J=m2 of the parameters and the inertia of the roller, the larger the inertia of the roller is, the more difficult the motor is to control, and the worse the control precision is, considering the increase of the radius of the roller, the inertia increase proportion is more than square; the smaller the diameter of the roller is, the worse the accuracy of the calibration result of the non-contact speedometer is, the synchronous rotating speed of the two-pole motor is 3000r/min, the diameter of the roller is 360mm, and the requirement of the test speed of 200km/h is met.
In the aspect of motor type selection, the embodiment adopts that the motor drives the roller to stably run and mainly overcomes the friction resistance moment of the bearing: m=μfd/2. Taking the bearing mass into consideration, the mu value is 0.01, the bearing load mainly comes from the test roller, and the total mass of the test roller and the roller shaft is not more than 20kg.
The inner diameter of the bearing is 35mm,
1) Maximum moment of resistance:
M＝μFd/2
＝0.01×200×0.035/2
＝0.035Nm,
the output torque of the relative motor is small and can be ignored.
2) Load inertia:
the load mainly comprises a cast aluminum roller, a roller shaft and a coupler.
Inertia of the cast aluminum roller:
J1＝0.2kgm2
drum shaft inertia:
J2≤0.001kgm2
coupling inertia:
J3＝0.0011kgm2
total inertia of load
J0＝J1+J2+J3
＝0.2+0.001+0.0011
＝0.2021kgm2
3) Angular acceleration of motor start rotor:
ε＝T/(J0+JM)
＝18.112/0.2021
＝85.03rad/s2
t is motor output torque, J0 is load inertia, JM is motor rotor inertia 3) starting time:
t＝ωmax/ε
＝308.64/85.03
＝3.63s
ωmax is the maximum angular velocity of the drum (200 km/h corresponds to an angular velocity of 308.64 rad/s)
As the maximum linear speed of 200km/h corresponds to the maximum rotating speed of the roller to 2947.3r/min and exceeds the rated rotating speed 2900r/min of the motor, the motor is in a constant power control stage after exceeding, and the output torque of the motor is reduced along with the rising of the rotating speed, the angular acceleration of the rotor is also reduced along with the falling of the output torque of the motor, and the acceleration time is increased, so that the time required by the motor to drive the roller to the maximum rotating speed is more than 3.63s.
In summary, the motor power rating is selected to be 5.5kw and the rated rotational speed 2900r/min.
Frequency converter selection
The rated power of the motor is 5.5kw, the motor is matched with a corresponding power frequency converter, the control mode of FOC+PG (closed loop vector control) of the frequency converter is realized by matching with the feedback of a rotary encoder, the frequency control output precision can reach 0.01%, and the test requirement is met.
Encoder selection
The acquisition precision of the encoder can reach 1/2000=0.05%, and the detection requirement is met.
Control accuracy analysis:
reel manufacturing errors: k1 =0.2/360=0.056%
The frequency converter controls output precision: k2 =0.01%
Acquisition precision of rotary encoder: k3 =1/2000=0.05%
To sum up, the error is accumulated: k=k1+k2+k3=0.116% < 0.2%, satisfying the test requirements.
Before the test starts, to the time of sliding detector, should fix its speed sampler on the rack through magnetic force support, wherein, magnetic force support locates on the casing, the test window is by, magnetic force support includes rear end open-ended mounting box, spacing screw has been seted up at the top of mounting box, the cooperation is equipped with the spacer pin, through screwing up the spacer pin, utilize the spacer pin to contradict with the speed sampler's mutual pressure effect, thereby the fixed time of sliding detector that waits to calibrate makes the rotation wheel of speed sampler and the reliable contact of cylinder annular knurl face, no relative slip and beat.
After the equipment is fixed, the upper computer sets the testing parameters of the calibrating device with the equipment controller in the electric cabinet in a TCP/IP mode, the frequency converter controls the motor to rotate according to the set testing parameters, the motor drives the roller and the encoder to rotate, and the controller corrects the motor by collecting the output signals of the encoder, so that the accuracy of the rotating speed of the motor is ensured.
The specific operation is as follows:
b: setting the initial rotation speed v of the motor through the upper computer 0 The controller sends information to the frequency converter, the frequency converter controls the motor to operate, and meanwhile, the rotary encoder monitors the real-time rotating speed of the test roller and feeds back the real-time rotating speed to the frequency converter and the controller to correct the rotating speed of the motor in real time, so that the motor outputs a constant initial rotating speed v 0 The unit is km/h; recording a speed value vn displayed by a sliding time detector to be calibrated, wherein the unit is km/h;
c: repeating the step B for three times, and respectively recording the speed values v1, v2 and v3 displayed by the sliding time detector to be calibrated, wherein the unit is km/h; and calculating the speed measurement error of each time by using the formula (1), wherein the formula (1) is as follows:
the calculation result is as follows: Δv1, Δv2, Δv3;
d: comparing Deltav 1, deltav 2 and Deltav 3 in the step C, and taking the maximum value as an error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result; wherein, the maximum allowable error is: when the initial rotation speed v 0 When the maximum allowable error is 0.1 km/h-20 km/h, the maximum allowable error is +/-0.04 km/h; when the initial rotation speed v 0 When the maximum allowable error is 20km/h to 130km/h, the maximum allowable error is +/-0.2 percent km/h;
e: speed measurement error calibration with test points of 30km/h, 5km/h, 20km/h, 50km/h and 100km/h is performed below:
(1) When the test point is 30km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at 30km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(2) When the test point is 5km/h, i.e. v 0 Repeating step B three times, recording the initial speed v of the slide time detector to be calibrated 0 The speed values v1, v2, v3 displayed at 5km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(3) When the test point is 20km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at =20km/h, and then the speed measurement errors Δv1, Δv2, Δv3 are calculated according to formula (1), respectively, taking the maximum value as the error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(4) When the test point is 50km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at=50 km/h, and then the speed measurement errors Δv1, Δv2, Δv3 are calculated according to formula (1), respectively, taking the maximum value as the error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(5) When the test point is 100km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at 100km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
f: and E, tabulating and outputting the calibration result under each test point in the step E.
When calibrating a non-contact speedometer, comprising the steps of:
a: fixing the non-contact speedometer to be calibrated above the reflecting surface of the upper test roller by using a mounting bracket, and performing preheating treatment;
b: setting the sliding time detector, the calibrating device for the non-contact speedometer and the non-contact speedometer to be calibrated in a detection state, and setting the initial rotating speed v of the motor through an upper computer 0 The controller sends information to the frequency converter, the frequency converter controls the motor to operate, meanwhile, the real-time rotating speed of the test roller is monitored through the rotary encoder and fed back to the frequency converter and the controller, the rotating speed of the motor is corrected in real time, and the motor outputs a constant initial rotating speed v 0 The method comprises the steps of carrying out a first treatment on the surface of the Then, the motor rotating speed is gradually regulated to 180km/h, whether the display of the non-contact speedometer to be calibrated is normal or not is observed, and the testing range of the non-contact speedometer to be calibrated is detected; if the non-contact speedometer to be calibrated is displayed normally, performing the next step; if the non-contact speedometer to be calibrated is displayed abnormally, there are various possibilities that the non-contact speedometer to be calibrated is damaged or is improperly operated in the calibration process, so that multiple adjustments are performed to judge the result;
c: speed indication error calibration:
c1, the motor outputs a constant test rotating speed v through the step b b And reads the speed indication v of the non-contact speedometer to be calibrated i Repeating for three times to obtain three speed indication values v i1 、v i2 、v i3 The method comprises the steps of carrying out a first treatment on the surface of the And calculate the average value of three speed indication values
c2, calculating an indication error:
when testing the rotating speed v b When the maximum allowable error Deltav is not more than 50km/h 0 The error of the indication value is calculated according to the formula (3) by the method of the combination of the two,
wherein Deltav i : when the i test point is the ith test point, indicating value errors of the non-contact speedometer to be calibrated are i=1 and 2;
when testing the rotating speed v b When the maximum allowable error Deltav is greater than 50km/h 0 The error of the indication value is calculated according to the formula (4) by the method of the combination of the two,
in the formula δv i : when the i test point is the ith test point, indicating value errors of the non-contact speedometer to be calibrated are i=3, 4, 5 and 6;
d: the following is carried out according to the step c, wherein the speed indication errors of the test points are 10km/h, 30km/h, 60km/h, 90km/h, 120km/h and 180km/h, and the corresponding serial numbers are i=1, 2, 3, 4, 5 and 6:
d1, when the test point is 10km/h, i.e. v b =10 km/h, repeat step c; according to the formula (3), when i is equal to 1, calculating the error Deltav of the velocity indication 1 Then the error Deltav of the speed indication value is calculated 1 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.1km/h, thereby obtaining a calibration result;
d2, when the test point is 30km/h, i.e. v b =30 km/h, repeat step c; according to the formula (3), when i is equal to 2, calculating the error Deltav of the velocity indication 2 Then the error Deltav of the speed indication value is calculated 2 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.1km/h, thereby obtaining a calibration result;
d3, when the test point is 60km/h, i.e. v b =60 km/h, repeat step c; according to the formula (4), when i is equal to 3, calculating the error Deltav of the velocity indication 3 Then the error Deltav of the speed indication value is calculated 3 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 90km/h, i.e. v b =90 km/h, repeat step c; according to the formula (4), when i is equal to 4, calculating the speed indication error Deltav 4 Then the error Deltav of the speed indication value is calculated 4 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 120km/h, i.e. v b ＝1Repeating the step c for 20 km/h; according to the formula (4), when i is equal to 5, calculating the error Deltav of the velocity indication 5 Then the error Deltav of the speed indication value is calculated 5 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 180km/h, i.e. v b =180 km/h, repeat step c; according to the formula (4), when i is equal to 6, calculating the speed indication error Deltav 6 Then the error Deltav of the speed indication value is calculated 6 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
e: performing distance indication error calibration with test points of 25m and 100 m:
e1: when the calibration distance is 25m, the rotating speed of the motor is set to be 30km/h, after the speed is stable, the synchronous metering distance between the test roller and the speedometer is ensured, and the distance indication value of the motor and the speedometer is read; repeating the measurement for 3 times, and recording;
when the distance is not more than 30m, calculating a distance indication error according to formula (5),
wherein Δs j ＝s j -s Aj (6)
In the formula (5) and the formula (6), Δs: distance indication error of the non-contact speedometer to be calibrated;
Δs j : when the j-th measurement is carried out, the distance indication error of the non-contact speedometer is to be calibrated;
s j : when the j-th measurement is carried out, the distance indication value of the non-contact speedometer to be calibrated;
s Aj when the j-th measurement is carried out, the distance of the motor is displayed;
e2: when the calibration distance is 100m, the rotating speed of the motor is set to be 100km/h, after the speed is stable, the synchronous metering distance between the test roller and the speedometer is ensured, and the distance indication value of the motor and the speedometer is read; repeating the measurement for 3 times, and recording;
When the distance is greater than 30m, calculating a distance indication error according to a formula (7);
wherein->
δs in the formula (7) and the formula (8): distance indication error of the non-contact speedometer to be calibrated;
δs j : when the j-th measurement is carried out, the distance indicating value error of the non-contact speedometer to be calibrated is j=1, 2 and 3;
s j : when the j-th measurement is carried out, the distance indication value of the non-contact speedometer to be calibrated;
s Aj when the j-th measurement is carried out, the distance of the motor is displayed;
in summary, according to the formula (5) and the formula (7), the distance indication errors of which the test points are 25m and 100m are obtained;
f: and d, tabulating and outputting the calibration result under each test point in the steps d and e.
Through the steps, the device can complete the whole speed value calibration of the sliding time detector; calibrating the speed and the distance of the non-contact speedometer; the structure is simple, and the after-sale maintenance and the daily maintenance are convenient; the convenient software control system has accurate test and short detection time; the functions are comprehensive, the operation is simple and easy to learn, the system is simple to upgrade, and the maintenance is easy; and the circuit design is overvoltage-proof, phase failure-proof and interference-proof.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present invention.
Claims (6)
1. A slide time detector and calibrating device for non-contact speedometer, characterized in that: the device comprises a base, a shell and a checking detection mechanism, wherein the checking detection mechanism is arranged on the base and in the shell and comprises a frequency converter, a motor, a test roller, an encoder and a controller, the control end of the controller is connected with the controlled end of the frequency converter, the control end of the frequency converter is connected with the controlled end of the motor, the output shaft of the motor is connected with the central shaft of the test roller through a coupling, the encoder and the central shaft of the test roller synchronously run, the central shaft of the test roller is horizontally arranged, and the signal output end of the encoder is respectively connected with the feedback receiving end of the frequency converter and the feedback receiving end of the controller; the encoder is used for monitoring the real-time rotating speed of the test roller, and the encoder realizes closed-loop control of the frequency converter on the motor;
the base comprises a bottom frame and a plurality of keels arranged on the frame, the checking and detecting mechanism is fixed on the keels, and the output shaft of the motor and the central shaft of the test roller are arranged on the same horizontal shaft;
the magnetic seat is arranged on the shell and beside the test window and comprises an installation box with an opening at the rear end, a limit screw hole is arranged on the installation box, and a limit pin is cooperatively arranged on the installation box and used for fixing the sliding time detector to be calibrated;
The mounting bracket comprises a portal frame and a mounting seat, the mounting seat is fixed on an upper beam of the portal frame, the mounting seat is arranged above a reflecting surface of the wall of the portal frame, and the non-contact speedometer is arranged in the mounting seat;
the shell is provided with a test window, the test window is arranged corresponding to the wall of the test roller, and the outer circular surface of the wall is formed by splicing knurling and reflecting surfaces left and right; the sliding time detector to be calibrated is arranged above the test window through the magnetic support, and is in close contact with the knurled surface of the cylinder wall without relative sliding; the non-contact speedometer to be calibrated is arranged above the test window through the mounting bracket, and a probe of the non-contact speedometer to be calibrated faces the reflecting surface of the cylinder wall;
the controller is also connected with an external upper computer.
2. The slide time detector and calibration device for a noncontact speedometer according to claim 1, wherein: the test roller comprises a cylinder wall, a central shaft and balance discs, wherein 2-4 balance discs are radially arranged between the central shaft and the cylinder wall, and 2-4 balance discs are uniformly arranged along the axial direction at intervals.
3. The slide time detector and calibration device for a noncontact speedometer according to claim 2, wherein: and a plurality of through holes are uniformly distributed on each balance disc.
4. The slide time detector and calibration device for a noncontact speedometer according to claim 1, wherein: the encoder adopts a rotary encoder.
5. A method for calibrating a taxitime detector based on the calibration device for a non-contact speedometer and a taxitime detector according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
a: fixing the sliding time detector to be calibrated on the shell by utilizing the magnetic seat, so that the rotating wheel of the contact type speed sampler of the sliding time detector to be calibrated is in contact with the knurled surface of the test roller, and no relative sliding or jumping exists;
b: setting the initial rotation speed v of the motor through the upper computer 0 The controller sends information to the frequency converter, the frequency converter controls the motor to operate, and meanwhile, the rotary encoder monitors the real-time rotating speed of the test roller and feeds back the real-time rotating speed to the frequency converter and the controller to correct the rotating speed of the motor in real time, so that the motor outputs a constant initial rotating speed v 0 The unit is km/h; recording a speed value vn displayed by a sliding time detector to be calibrated, wherein the unit is km/h;
c: repeating the step B for three times, and respectively recording the speed values v1, v2 and v3 displayed by the sliding time detector to be calibrated, wherein the unit is km/h; and calculating the speed measurement error of each time by using the formula (1), wherein the formula (1) is as follows:
The calculation result is as follows: Δv1, Δv2, Δv3;
d: comparing Deltav 1, deltav 2 and Deltav 3 in the step C, and taking the maximum value as an error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result; wherein, the maximum allowable error is: when the initial rotation speed v 0 When the maximum allowable error is 0.1 km/h-20 km/h, the maximum allowable error is +/-0.04 km/h; when the initial rotation speed v 0 When the maximum allowable error is 20 km/h-130 km/h, the maximum allowable error is +/-0.2 km/h;
e: speed measurement error calibration with test points of 30km/h, 5km/h, 20km/h, 50km/h and 100km/h is performed below:
(1) When the test point is 30km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at 30km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(2) When the test point is 5km/h, i.e. v 0 Repeating step B three times, recording the initial speed v of the slide time detector to be calibrated 0 The speed values v1, v2, v3 displayed at 5km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(3) When the test point is 20km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at =20km/h, and then the speed measurement errors Δv1, Δv2, Δv3 are calculated according to formula (1), respectively, taking the maximum value as the error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(4) When the test point is 50km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at=50 km/h, and then the speed measurement errors Δv1, Δv2, Δv3 are calculated according to formula (1), respectively, taking the maximum value as the error calibration value; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
(5) When the test point is 100km/h, i.e. v 0 Step B is repeated three times, and the initial velocity v of the taxiing time detector to be calibrated is recorded respectively 0 The speed values v1, v2, v3 displayed at 100km/h are calculated according to formula (1), and the maximum values are taken as error calibration values; comparing the error calibration value with the maximum allowable error to obtain a calibration result;
F: and E, tabulating and outputting the calibration result under each test point in the step E.
6. A method for calibrating a non-contact speedometer based on the slide time detector and the calibration device for a non-contact speedometer according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
a: fixing the non-contact speedometer to be calibrated above the reflecting surface of the upper test roller by using a mounting bracket, and performing preheating treatment;
b: setting the sliding time detector, the calibrating device for the non-contact speedometer and the non-contact speedometer to be calibrated in a detection state, and setting the initial rotating speed v of the motor through an upper computer 0 The controller sends information to the frequency converter, the frequency converter controls the motor to operate, meanwhile, the real-time rotating speed of the test roller is monitored through the rotary encoder and fed back to the frequency converter and the controller, the rotating speed of the motor is corrected in real time, and the motor outputs a constant initial rotating speed v 0 The method comprises the steps of carrying out a first treatment on the surface of the Then, the motor rotating speed is gradually regulated to 180km/h, whether the display of the non-contact speedometer to be calibrated is normal or not is observed, and the testing range of the non-contact speedometer to be calibrated is detected; if the non-contact speedometer to be calibrated is displayed normally, performing the next step;
c: speed indication error calibration:
c1, the motor outputs a constant test rotating speed v through the step b b And reads the speed indication v of the non-contact speedometer to be calibrated i Repeating for three times to obtain three speed indication values v i1 、v i2 、v i3 The method comprises the steps of carrying out a first treatment on the surface of the And obtaining the average value v of three speed indication values i ；
c2, calculating an indication error:
when testing the rotating speed v b When the maximum allowable error Deltav is not more than 50km/h 0 The error of the indication value is calculated according to the formula (3) by the method of the combination of the two,
wherein Deltav i : when the i test point is the ith test point, indicating value errors of the non-contact speedometer to be calibrated are i=1 and 2;
when testing the rotating speed v b When the maximum allowable error Deltav is greater than 50km/h 0 The error of the indication value is calculated according to the formula (4) by the method of the combination of the two,
in the formula δv i : when the i test point is the ith test point, indicating value errors of the non-contact speedometer to be calibrated are i=3, 4, 5 and 6;
d: the following is carried out according to the step c, wherein the speed indication errors of the test points are 10km/h, 30km/h, 60km/h, 90km/h, 120km/h and 180km/h, and the corresponding serial numbers are i=1, 2, 3, 4, 5 and 6:
d1, when the test point is 10km/h, i.e. v b =10 km/h, repeat step c; according to the formula (3), when i is equal to 1, calculating the error Deltav of the velocity indication 1 Then the error Deltav of the speed indication value is calculated 1 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.1km/h, thereby obtaining a calibration result;
d2, when the test point is 30km/h, i.e. v b =30 km/h, repeat step c; according to the formula (3), when i is equal to 2, calculating the error Deltav of the velocity indication 2 Then the error Deltav of the speed indication value is calculated 2 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.1km/h, thereby obtaining a calibration result;
d3, when the test point is 60km/h, i.e. v b =60 km/h, repeat step c; according to the formula (4), when i is equal to 3, calculating the error Deltav of the velocity indication 3 Then the error Deltav of the speed indication value is calculated 3 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 90km/h, i.e. v b =90 km/h, repeat step c; according to the formula (4), when i is equal to 4, calculating the speed indication error Deltav 4 Then the error Deltav of the speed indication value is calculated 4 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 120km/h, i.e. v b =120 km/h, repeat step c; according to the formula (4), when i is equal to 5, calculating the error Deltav of the velocity indication 5 Then the error Deltav of the speed indication value is calculated 5 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
d3, when the test point is 180km/h, i.e. v b =180 km/h, repeat step c; according to the formula (4), when i is equal to 6, calculating the speed indication error Deltav 6 Then the error Deltav of the speed indication value is calculated 6 And the maximum allowable error Deltav 0 Compared with the ratio of = ±0.2km/h, thereby obtaining a calibration result;
e: performing distance indication error calibration with test points of 25m and 100 m:
e1: when the calibration distance is 25m, the rotating speed of the motor is set to be 30km/h, after the speed is stable, the synchronous metering distance between the test roller and the speedometer is ensured, and the distance indication value of the motor and the speedometer is read; repeating the measurement for 3 times, and recording;
when the distance is not more than 30m, calculating a distance indication error according to formula (5),
wherein Δs j ＝s j -s Aj (6)
In the formula (5) and the formula (6), Δs: distance indication error of the non-contact speedometer to be calibrated;
Δs j : when the j-th measurement is carried out, the distance indication error of the non-contact speedometer is to be calibrated;
s j : when the j-th measurement is carried out, the distance indication value of the non-contact speedometer to be calibrated;
s Aj when the j-th measurement is carried out, the distance of the motor is displayed;
e2: when the calibration distance is 100m, the rotating speed of the motor is set to be 100km/h, after the speed is stable, the synchronous metering distance between the test roller and the speedometer is ensured, and the distance indication value of the motor and the speedometer is read; repeating the measurement for 3 times, and recording;
When the distance is greater than 30m, calculating a distance indication error according to a formula (7);
wherein->
δs in the formula (7) and the formula (8): distance indication error of the non-contact speedometer to be calibrated;
δs j : when the j-th measurement is carried out, the distance indicating value error of the non-contact speedometer to be calibrated is j=1, 2 and 3;
s j : when the j-th measurement is carried out, the distance indication value of the non-contact speedometer to be calibrated;
s Aj when the j-th measurement is carried out, the distance of the motor is displayed;
in summary, according to the formula (5) and the formula (7), the distance indication errors of which the test points are 25m and 100m are obtained;
f: and d, tabulating and outputting the calibration result under each test point in the steps d and e.
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