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CN-122016024-A - Inter-axle interference error deduction calibration method for portable axle load instrument

CN122016024ACN 122016024 ACN122016024 ACN 122016024ACN-122016024-A

Abstract

The invention relates to the field of measurement and test, and particularly discloses a method for deducting and calibrating an inter-axle interference error of a portable axle weight instrument, which comprises the following steps of S1, acquiring basic information and completing matching verification of equipment and vehicle information; the method comprises the steps of S2, controlling a vehicle to be calibrated to sequentially pass through a portable axle weight instrument and a field reference weighing instrument, synchronously collecting multivariable data, S3, establishing an inter-axle interference coefficient dynamic model based on the collected multivariable data, calculating dynamic interference coefficients corresponding to all axles, S4, calculating inter-axle interference error values according to all axle weighing data and the dynamic interference coefficients, deducting the inter-axle interference error values to obtain calibrated axle weight data, S5, comparing and verifying the calibrated axle weight data with corresponding axle weight data of the field reference weighing instrument, and outputting a calibration result. The method solves the defects of low precision and poor adaptability of the existing calibration method, realizes accurate deduction of inter-axle interference under multivariable coupling, improves the calibration precision and efficiency, and adapts to different vehicle types, road surfaces and environments.

Inventors

  • Zu Shaohu

Assignees

  • 青海省计量检定测试院

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. The method for deducting and calibrating the inter-axle interference error of the portable axle weight instrument is characterized by comprising the following steps of: S1, acquiring basic parameters of a portable axle weight instrument, on-site reference weighing instrument parameters and axle set basic information of a vehicle to be calibrated, and completing matching verification of equipment and vehicle information; s2, controlling a vehicle to be calibrated to sequentially pass through the portable axle weight instrument and the on-site reference weighing instrument, and synchronously acquiring multivariable data, wherein the multivariable data comprises weighing data of each axle, the passing speed of the vehicle, the distance between axles and the gradient of a road surface; S3, establishing an inter-axis interference coefficient dynamic model based on the collected multivariable data, and calculating dynamic interference coefficients corresponding to all axes; S4, calculating an inter-axis interference error value according to the weighing data of each axis and the dynamic interference coefficient, completing interference error deduction and obtaining calibrated axis weight data; S5, comparing and verifying the corrected axle weight data with corresponding axle weight data of the on-site reference weighing apparatus, and outputting a correction result.
  2. 2. The method for deducting and calibrating the interference errors between shafts of the portable axle load instrument according to claim 1 is characterized in that in S1, the basic parameters of the portable axle load instrument comprise a measuring range, a sensor model and an inherent error correction parameter, the on-site reference weighing instrument parameter comprises a maximum weighing, verification precision grade and an effective weighing area range, the basic information of the vehicle axle set comprises an axle number, an axle type and a preset axle distance range, and the matching verification of the equipment and the vehicle information comprises the step of confirming that the measuring range of the portable axle load instrument is matched with the axle load of the vehicle and the precision grade of the reference weighing instrument meets the calibration requirement.
  3. 3. The method for calibrating inter-axle interference error deduction of a portable axle load instrument according to claim 1, wherein in S1, the method further comprises an axle set type identification step, wherein the image identification unit is used for distinguishing a steering axle, a driving axle and a trailer axle, and different axle sets correspond to different interference coefficient calibration intervals, namely, the steering axle corresponds to The coefficient is the lower limit of the calibration range, the driving shaft is the upper limit of the calibration range, and the trailer shaft is the middle value of the calibration range.
  4. 4. The method for calibrating the inter-axle interference error subtraction of the portable axle weight instrument according to claim 1, wherein in S2, the specific steps of synchronously collecting the multivariate data are as follows: S211, setting speed acquisition units at two ends of a weighing area of the portable axle weight instrument and the on-site reference weighing instrument, acquiring the instantaneous speed V of a vehicle when the vehicle passes through, and taking the average value of the speeds of the two passes as the final passing speed; S212, recording the time stamp of each axle of the vehicle passing through two devices through an axle position identification unit, and calculating the actual axle distance L by combining the final passing speed; s213, collecting road surface gradient of weighing area by using gradient sensor The acquisition precision is reserved to ; S214, synchronously recording weighing data of each shaft of portable axle weight instrument And weighing data of each shaft of the reference weighing machine Wherein For the number of axes to be referred to, , Is the total axle number of the vehicle.
  5. 5. The method for calibrating the inter-axle interference error subtraction of the portable axle weight instrument according to claim 1, wherein in S2, for the dynamic weighing scene, the specific steps of synchronously collecting the sensor original signal of the portable axle weight instrument and separating the front axle residual interference signal and the rear axle payload signal through fourier transform are as follows: S221, carrying out Fourier transform on an original signal of the sensor to obtain a signal frequency spectrum; s222, setting the interference signal frequency threshold When the frequency of the signal When the signal is judged to be the residual interference signal of the front axle, Determining a rear axle payload signal; S223, recording the amplitude A of the interference signal when Preset amplitude threshold And triggering an additional interference correction flow.
  6. 6. The method for calibrating the inter-axis interference error subtraction of a portable axle weight instrument according to claim 1, wherein in S3, the calculation formula of the dynamic model of the inter-axis interference coefficient is: ; In the formula, Is the first The dynamic interference coefficient of the shaft, Is the first Shaft and the first Distance between axes, when In the time-course of which the first and second contact surfaces, , For the vehicle passing speed, For the gradient of the road surface, For the fitting coefficient calibrated through experiments, the calibration range is 、 、 、 。
  7. 7. The method for calibrating the inter-axle interference error subtraction of the portable axle weight instrument according to claim 1, wherein in S3, the step of establishing the dynamic model of the inter-axle interference coefficient further comprises the step of compensating the environmental parameter, and the method comprises the steps of introducing the temperature T and the humidity H to correct the interference coefficient, wherein the formula of the corrected dynamic interference coefficient is as follows: ; In the formula, Is at the standard temperature of the water-based paint, Is a standard humidity level of the water in the water, For the environmental correction factor(s), , 。
  8. 8. The method for calibrating the inter-axle interference error subtraction of a portable axle weight instrument according to claim 1, wherein in S4, the specific steps of calculating and subtracting the inter-axle interference error value are as follows: S41, calculating the first Inter-axis interference error value of axis The calculation formula is as follows: ; s42, subtracting the interference error to obtain calibrated axle weight data W 1i ', wherein the calculation formula is as follows: ; s43, when When it is needed to superimpose the first Shaft pair first And correcting the residual interference of the shaft, wherein the correction formula is as follows: ; where 0.3 is the residual interference attenuation coefficient.
  9. 9. The method for calibrating the inter-axle interference error subtraction of the portable axle weight instrument according to claim 1, wherein in S5, the specific steps of comparing and verifying are as follows: s51, calculating the relative error of the axle weight data after calibration and the axle weight data of the reference weighing apparatus The calculation formula is as follows: ; S52, setting a qualified threshold value And not more than 0.3% when all shafts are When the calibration is qualified, and when the calibration is present Returning to S3 to re-optimize the interference coefficient dynamic model; S53, outputting a calibration report containing the original data of each axis, the interference error value, the calibrated data and the relative error.
  10. 10. The method for calibrating inter-axle interference error deduction of a portable axle weight instrument according to claim 9, wherein in S53, the method further comprises a step of tracing calibration data, wherein after the equipment information, the vehicle parameters, the multivariate acquisition data, the interference coefficients and the calibration results are sorted according to time stamps, encryption processing is performed, a blockchain hash value is generated and uploaded to a tracing platform, and an encryption formula of the tracing data is as follows: ; Wherein SHA-256 is an encryption algorithm, the equipment number is a unique identification code of a portable axle weight instrument, and the vehicle VIN code is a unique identification code of a vehicle to be calibrated.

Description

Inter-axle interference error deduction calibration method for portable axle load instrument Technical Field The invention relates to the technical field of measurement and test, in particular to a method for deducting and calibrating inter-axle interference errors of a portable axle weight instrument. Background The portable axle weight instrument is widely applied to the mechanical metering scenes such as highway overrun flow detection, logistics park vehicle weighing, engineering vehicle load checking and the like by virtue of the advantages of strong portability and high detection efficiency, and the weighing precision is directly related to the accuracy and fairness of metering verification results. In the actual multi-axle vehicle weighing process, when adjacent axles sequentially pass through the weighing plate, the front axle load can cause micro deformation or vibration of the weighing plate, and the residual deformation and vibration can interfere rear axle weighing data to form an inter-axle interference error, and the error becomes a core factor for restricting the improvement of the metering precision of the portable axle weight instrument. In order to subtract the inter-axis interference error, the calibration method adopted in the prior art mainly comprises an empirical coefficient method, a single-axis calibration method, a static interference elimination method and a direct difference calibration method. The method for calibrating the vehicle by the single axis has the advantages that the error correction is carried out by adopting a fixed interference coefficient, the vehicle with different axial spacing, speed and road surface conditions cannot be adapted, the universality is poor, the calibration is completed by adopting a single axis calibration method through loading of single axis weights, the interference effect generated by multi-axis linkage is completely ignored, the calibration logic is disjointed from the actual use scene, the static interference elimination method requires the vehicle to be statically weighed, the static interference elimination method is only suitable for static scenes, the calibration requirement of dynamic weighing cannot be met, the calibration efficiency is extremely low, the total interference error is averagely distributed to each axis by adopting a direct difference value calibration method, the interference degree difference of different axes is not distinguished, and the calibration precision is difficult to ensure. In addition, the influence of environmental parameters such as temperature, humidity and the like on the interference coefficient is not generally considered in the existing calibration method, meanwhile, under a dynamic weighing scene, the front axle residual interference signal and the rear axle effective load signal acquired by the sensor are easy to overlap, accurate separation cannot be realized, and the reliability of a calibration result is further reduced. In summary, the existing method for calibrating the inter-axle interference error deduction of the portable axle weight instrument has the problems of fixed interference coefficient, poor scene adaptability, weak dynamic signal separation capability, low calibration precision and the like, and the method for calibrating the portable axle weight instrument is needed to dynamically match on-site multivariable parameters, adapt to dynamic weighing scenes and accurately deduct the inter-axle interference error so as to realize on-site rapid and accurate calibration of the portable axle weight instrument. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a method for deducting and calibrating the inter-axle interference error of a portable axle weight instrument, which solves the problems of fixed interference coefficient, poor scene suitability, weak dynamic signal separation capability, low calibration precision and the like in the existing calibration method and improves the calibration precision and efficiency. In order to achieve the above objective, the present invention provides a method for calibrating inter-axle interference error subtraction of a portable axle weight instrument, comprising: S1, acquiring basic parameters of a portable axle weight instrument, on-site reference weighing instrument parameters and axle set basic information of a vehicle to be calibrated, and completing matching verification of equipment and vehicle information; s2, controlling a vehicle to be calibrated to sequentially pass through the portable axle weight instrument and the on-site reference weighing instrument, and synchronously acquiring multivariable data, wherein the multivariable data comprises weighing data of each axle, the passing speed of the vehicle, the distance between axles and the gradient of a road surface; S3, establishing an inter-axis interference coefficient dynamic model based on the collected multivariable data, and calculating dynamic