WO2021251809A4 - Dynamic weighing system operating at high speed designed to measure the static load of the axles and the overall weight of a road transportation vehicle - Google Patents
Dynamic weighing system operating at high speed designed to measure the static load of the axles and the overall weight of a road transportation vehicle Download PDFInfo
- Publication number
- WO2021251809A4 WO2021251809A4 PCT/MA2021/000009 MA2021000009W WO2021251809A4 WO 2021251809 A4 WO2021251809 A4 WO 2021251809A4 MA 2021000009 W MA2021000009 W MA 2021000009W WO 2021251809 A4 WO2021251809 A4 WO 2021251809A4
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- WO
- WIPO (PCT)
- Prior art keywords
- axle
- signal
- weighing system
- vehicle
- analog signal
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/022—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing wheeled or rolling bodies in motion
- G01G19/024—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing wheeled or rolling bodies in motion using electrical weight-sensitive devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention relates to a dynamic weighing system operating at high speed that can measure, under normal traffic conditions, the static load of the axles and the overall weight of the road transportation vehicle (5). This system is made up of a grid of piezoelectric sensors (1), with an optimal number of ten sensors, buried transversely in the traffic lane of the roadway, where the distance between the sensors is non-uniform and defined according to the Tchebychev formula. This grid of piezoelectric sensors (1) makes it possible to reconstruct the analog signal of the load of the axle of the vehicle (5) on the basis of the voltages generated by the sensors, the values of which are proportional to the immediate forces applied by the wheels of the axle of the vehicle to the surface of the road (6). This analog signal comprises a continuous component (static load of the axle) and a variable component (dynamic loads generated by the wheel-road interaction). The sensor grid (1) is coupled with an analog filter comprising two circuit boards. The first circuit board, which performs conditioning of the signal produced by the piezoelectric sensor, processes the signal from the sensors, which is characterized by a signal-to-noise ratio that is too low, in order to increase the readability and usability of said signal. The second circuit board, which is dedicated to processing the analog signal and measuring the static load of the axle of the vehicle (5), removes, by means of a high-pass filter, the continuous component of the analog signal reconstructed from the static load of the axle and then defines the points of the filtered signal that have a null variable component. At these points, the value of the voltage measured on the reconstructed analog signal of the axle is only the voltage of the static load of the axle. By introducing the calibrating coefficient, the value of the measured voltage relative to the load of the axle is transformed into a value in weight units.
Claims
1. Système de pesage dynamique en marche à haute vitesse, est caractérisé en ce qu'il comprend : a) Grille de 10 capteurs piézoélectriques (1) enfouis dans la chaussée. Chaque capteur génère un signal analogique apériodique, sous forme de tension, en réponse à la pression exercée par l'essieu du véhicule sur ledit capteur ; b) Microprosseceur (10) recevant l'algorithme de reconstruction du signal analogique de la charge à l'essieu sur la base des données émanant de la grille de capteurs piézoélectriques ; c) Circuit d'amplification (A2, POT, R8), qui varie l'amplitude du signal analogique de la charge à l'essieu à l'aide du potentiomètre POT ; d) Circuit électronique (C3, R9) qui rejette la composante continue du signal analogique de la charge à l'essieu ; e) Comparateur (A3, RIO) couplé avec le circuit (C3, R9) réalisant un signal carré d'amplitude minimum de 5 volts. 1. Dynamic weighing system in motion at high speed, is characterized in that it comprises: a) Grid of 10 piezoelectric sensors (1) buried in the roadway. Each sensor generates an aperiodic analog signal, in the form of a voltage, in response to the pressure exerted by the axle of the vehicle on said sensor; b) Microprocessor (10) receiving the reconstruction algorithm of the analog signal of the axle load on the basis of the data emanating from the grid of piezoelectric sensors; c) Amplification circuit (A2, POT, R8), which varies the amplitude of the analog axle load signal using the POT potentiometer; d) Electronic circuit (C3, R9) which rejects the DC component of the axle load analog signal; e) Comparator (A3, RIO) coupled with the circuit (C3, R9) producing a square signal with a minimum amplitude of 5 volts.
2. Système de pesage dynamique en marche à haute vitesse, selon la revendication 1, caractérisé en ce que l'opération de mesurage de la charge statique de l'essieu et du poids global du véhicule (5) s'effectue à travers la reconstruction du signal analogique de la charge à l'essieu du véhicule (5). Le signal analogique reconstruit suit la forme de l'équation suivante :
2. High-speed in-motion weighing system, according to claim 1, characterized in that the operation of measuring the static load of the axle and the overall weight of the vehicle (5) is carried out through the reconstruction of the vehicle's axle load analogue signal (5). The reconstructed analog signal follows the form of the following equation:
Avec F est le polynôme de Lagrange au plus de degré n qui passe sur les points ( tk,Vk ) (3). tk est le temps de passage de l'essieu du véhicule du véhicule (5) sur le capteur d'ordre k et le est la tension générée par le capteur d'ordre k suite à la force instantanée exercée par l'essieu du véhicule sur ce capteur. With F is the Lagrange polynomial at most of degree n which passes over the points ( tk,Vk ) (3). tk is the passage time of the vehicle axle of the vehicle (5) on the k-order sensor and le is the voltage generated by the k-order sensor as a result of the instantaneous force exerted by the vehicle axle on this sensor.
3. Système de pesage dynamique en marche à haute vitesse, selon la revendication 1, caractérisé en ce que la grille de capteurs piézoélectriques (1) contient au moins dix capteurs piézoélectriques, arrangés transversalement par rapport à l'axe de la chaussée du véhicule (6), selon un pas non uniforme. La position de chaque capteur, suivant l'axe des abscisses, est définie par la formule ci-après :
3. High-speed dynamic on-the-fly weighing system, according to claim 1, characterized in that the piezoelectric sensor grid (1) contains at least ten piezoelectric sensors, arranged transversely with respect to the axis of the roadway of the vehicle ( 6), in a non-uniform pitch. The position of each sensor, along the abscissa axis, is defined by the formula below:
Avec : With :
- (n+1) est le nombre de capteurs piézoélectriques - (n+1) is the number of piezoelectric sensors
- a et b sont les abscisses de deux points A et B délimitant la grille de capteurs piézoélectriques (1) selon l'axe des abscisses (parallèle à l'axe longitudinal de la chaussée (8). - a and b are the abscissae of two points A and B delimiting the grid of piezoelectric sensors (1) along the axis of the abscissae (parallel to the longitudinal axis of the roadway (8).
4. Système de pesage dynamique en marche à haute vitesse, selon les revendications 1 et 3, caractérisé en ce que la longueur de la grille de capteurs piézoélectriques (1) est d'au moins 1.90 mètres de longueur. Cette distance est nécessaire pour circonscrire le signal analogique de l'essieu du véhicule dans une bande limitée réalisant la précision de l'algorithme de la reconstruction du signal analogique de la charge à l'essieu. 4. High-speed dynamic on-the-fly weighing system, according to claims 1 and 3, characterized in that the length of the grid of piezoelectric sensors (1) is at least 1.90 meters in length. This distance is necessary to circumscribe the analog signal of the axle of the vehicle in a limited band realizing the accuracy of the algorithm of the reconstruction of the analog signal of the axle load.
5. Système de pesage dynamique en marche à haute vitesse, selon les revendications 1 et 2, caractérisé en ce que le circuit électronique (C3, R9) est un dispositif qui fait passer uniquement la composante variable du signal et rejette la composante continue dont la fréquence est inférieur à 0.16Hz ; 5. High-speed dynamic on-the-fly weighing system, according to claims 1 and 2, characterized in that the electronic circuit (C3, R9) is a device which passes only the variable component of the signal and rejects the DC component whose frequency is less than 0.16Hz;
6. Système de pesage dynamique en marche à haute vitesse, selon les revendications 1, 2 et 5, caractérisé en ce que le dispositif de Zéro Crossing detector comprend un amplificateur opérationnel type comparateur A3, alimenté avec une seule source d'alimentation minimum de +5 volts, réalise à sa sortie les mesures de temps pour lesquels les charges dynamiques, comprises dans le signal analogique de la charge à l'essieu, s'annulent ;
21 6. High-speed dynamic on-the-fly weighing system, according to claims 1, 2 and 5, characterized in that the Zero Crossing detector device comprises an operational amplifier of the comparator type A3, supplied with a single minimum power source of + 5 volts, performs at its output the time measurements for which the dynamic loads, included in the analog signal of the axle load, cancel each other out; 21
7. Système de pesage dynamique en marche à haute vitesse, selon les revendications 1-2, 5-6, caractérisé en ce que le signal apériodique produit par le circuit électronique (C3, R9) est rendu par le comparateur A3 un signal carré. Les points de projection des côtés montant et descendant du signal carré avec l'axe des abscisses coïncident avec les points d'intersection du signal apériodique produit par le circuit électronique (C3, R9) avec l'axe des abscisses ; 7. High-speed dynamic in-motion weighing system, according to claims 1-2, 5-6, characterized in that the aperiodic signal produced by the electronic circuit (C3, R9) is rendered by the comparator A3 a square signal. The projection points of the rising and falling sides of the square signal with the abscissa axis coincide with the points of intersection of the aperiodic signal produced by the electronic circuit (C3, R9) with the abscissa axis;
8. Système de pesage dynamique en marche à haute vitesse, selon les revendications 1, 3 et 4, caractérisé en ce que le Microprosseceur (10) reçoit les couples (to,vo), (ti,vi), . ,(t9,vg) sur ses entrées analogiques et produit le signal analogique de la charge à l'essieu à l'aide de l'algorithme du polynôme de Lagrange- Tchebychev; 8. High-speed in-motion dynamic weighing system, according to claims 1, 3 and 4, characterized in that the Microprocessor (10) receives the pairs (to, vo), (ti, vi), . ,(t 9 ,vg) on its analog inputs and produces the analog axle load signal using the Lagrange-Chebyshev polynomial algorithm;
9. Système de pesage dynamique en marche à haute vitesse, selon les revendications 1, 3 et 4, caractérisé en ce que le circuit émetteur-suiveur formé de (Tl, C2, R4) transforme le signal analogique apériodique en un signal déterministe, sous forme d'impulsions dont la valeur maximale varie proportionnellement avec la force instantanée appliquée par la roue sur le capteur piézoélectrique ; 9. High-speed dynamic on-the-fly weighing system, according to claims 1, 3 and 4, characterized in that the emitter-follower circuit formed by (T1, C2, R4) transforms the aperiodic analog signal into a deterministic signal, under form of pulses whose maximum value varies proportionally with the instantaneous force applied by the wheel to the piezoelectric sensor;
10. Système de pesage dynamique en marche à haute vitesse, selon les revendications 1 à 9, caractérisé en ce que le Microprosseceur (10) reçoit le programme qui mesure les temps t, pour lesquelles les charges dynamiques s'annulent et procède ensuite à la mesure la charge statique de l'essieu correspondant aux temps ti.
10. High-speed dynamic in-motion weighing system, according to claims 1 to 9, characterized in that the Microprocessor (10) receives the program which measures the times t, for which the dynamic loads cancel each other out and then proceeds to the measures the static axle load corresponding to times ti.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MA50051 | 2020-06-12 | ||
| MA50051A MA50051B1 (en) | 2020-06-12 | 2020-06-12 | High-speed in-motion weighing system intended for measuring the static axle load and the overall weight of road transport vehicles. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2021251809A1 WO2021251809A1 (en) | 2021-12-16 |
| WO2021251809A4 true WO2021251809A4 (en) | 2022-01-13 |
Family
ID=76943065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/MA2021/000009 WO2021251809A1 (en) | 2020-06-12 | 2021-06-11 | Dynamic weighing system operating at high speed designed to measure the static load of the axles and the overall weight of a road transportation vehicle |
Country Status (2)
| Country | Link |
|---|---|
| MA (1) | MA50051B1 (en) |
| WO (1) | WO2021251809A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114919593B (en) * | 2022-07-23 | 2022-10-14 | 天津所托瑞安汽车科技有限公司 | Vehicle load estimation method, apparatus and storage medium |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH689599A5 (en) * | 1993-11-23 | 1999-06-30 | Kk Holding Ag | Transducer arrangement for installation in carriageways for the purpose of detecting the weights and / or the driving dynamic reactions of vehicle wheels. |
| EP0997713A1 (en) * | 1998-10-29 | 2000-05-03 | K.K. Holding AG | Traffic monitoring systems |
| FR2978563B1 (en) * | 2011-07-29 | 2014-03-21 | Yzatec | SENSOR FOR PASSING ROAD VEHICLES WITH INDEPENDENT JUXTAPOSES PIEZOELECTRIC SENSORS |
-
2020
- 2020-06-12 MA MA50051A patent/MA50051B1/en unknown
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2021
- 2021-06-11 WO PCT/MA2021/000009 patent/WO2021251809A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021251809A1 (en) | 2021-12-16 |
| MA50051A1 (en) | 2021-12-31 |
| MA50051B1 (en) | 2022-03-31 |
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