WO2012010943A1 - Système et procédé pour peser des véhicules en mouvement - Google Patents

Système et procédé pour peser des véhicules en mouvement Download PDF

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Publication number
WO2012010943A1
WO2012010943A1 PCT/IB2011/001657 IB2011001657W WO2012010943A1 WO 2012010943 A1 WO2012010943 A1 WO 2012010943A1 IB 2011001657 W IB2011001657 W IB 2011001657W WO 2012010943 A1 WO2012010943 A1 WO 2012010943A1
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WO
WIPO (PCT)
Prior art keywords
platform
measuring unit
wheel
output signal
measurement
Prior art date
Application number
PCT/IB2011/001657
Other languages
English (en)
Inventor
Michael Trakhimovich
Original Assignee
Shekel Scales (2008) Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shekel Scales (2008) Ltd. filed Critical Shekel Scales (2008) Ltd.
Publication of WO2012010943A1 publication Critical patent/WO2012010943A1/fr
Priority to US13/741,409 priority Critical patent/US20130220709A1/en

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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

Definitions

  • the present invention relates to weighing systems and, more particularly, to weighing apparatus, systems and methods for weighing vehicles in motion.
  • WIM Weigh-in-motion
  • WIM truck traffic is monitored without alerting truck drivers.
  • Truck operators may go to considerable lengths to avoid a weigh station for various reasons. This avoidance reduces the amount of data available to regulatory authorities as to truck traffic and also places heavy trucks on roads not designed for such traffic.
  • a WIM system may typically include a base anchored in concrete beneath the surface of the roadway, a weighing platform preferably disposed in a substantially level fashion with respect to the surface of the roadway, and load cells, mounted between the platform and the base, adapted to provide a signal indicating the load applied by the wheel contacting the platform.
  • the present inventor has recognized a need for improved methods, apparatus, and systems for weighing vehicles in motion, and the subject matter of the present disclosure and claims is aimed at fulfilling this need.
  • a weigh-in- motion system for accurately determining a weight of a moving vehicle on a roadway by measurement of vertical forces compensated by horizontal forces applied by a wheel of the vehicle to a weighing platform, the system including: (a) a base adapted to be anchored to a roadbed of the roadway; (b) a weighing platform mounted on the base and adapted to receive the wheel of the moving vehicle along a longitudinal axis of the platform, the platform having a length of at least 0.5 meters along the axis; (c) at least one load cell disposed between the base and the platform, and adapted to provide vertical load signals indicating vertical loads applied by the wheel on the platform; (d) a longitudinal differentiation mechanism, mechanically associated with the platform and the base, the longitudinal differentiation mechanism including: (i) a mechanical resistance-measuring unit adapted to provide a resistance to a relative horizontal movement between the base and the platform, the movement generally along the longitudinal axis, to differentiate horizontal forces produced by the wheel acting on the platform
  • a method of accurately determining a weight of a moving vehicle on a roadway by measurement of vertical forces compensated by horizontal forces applied by a wheel of a vehicle to a weighing platform including the steps of: (a) providing a system including: (i) a base anchored to a roadbed of the roadway; (ii) a weighing platform mounted on the base and adapted to receive the wheel of the moving vehicle along a longitudinal axis of the platform, the platform having a length of at least 0.5 meters along the axis; (iii) at least one load cell disposed between the base and the platform, and adapted to provide load signals indicating loads applied by the wheel on the platform; (iv) a longitudinal differentiation mechanism, mechanically associated with the platform and the base, the longitudinal differentiation mechanism including: (A) a mechanical unit adapted to provide a resistance to a relative horizontal movement between the base and the platform, the movement generally along the longitudinal axis, to differentiate horizontal forces produced by the wheel acting on the platform,
  • the at least one load cell includes at least two load cells, at least three load cells, or at least four load cells.
  • the measurement of the parameter is a plurality of measurements over a period in which the wheel is disposed on the platform.
  • At least one of the measuring unit and the processing unit is further configured to exclude from the compensation for error in the vertical load signals, at least one of an initial data spike and a final data spike in the output signal.
  • At least one of the measuring unit and the processing unit is further configured to exclude from the compensation for error in the vertical load signals, both an initial data spike and a final data spike in the output signal.
  • the measurement of the parameter is a plurality of measurements over a particular time interval
  • at least one of the measuring unit and the processing unit is further configured to exclude, from the compensation for error in the vertical load signals, the output signal produced during at least one of an initial period and a final period of the interval, or during both an initial period and a final period of the interval.
  • the measurement of the parameter is a plurality of measurements over a particular time interval
  • the processing unit is further configured to define a measurement window based on at least one pre-determined rule, and to solely utilize the output signal produced during the measurement window, in effecting the compensation for error in the vertical load signals.
  • the system further includes a restoration mechanism, mechanically associated with the platform, the restoration mechanism adapted to repeatably restore the platform to a particular position.
  • the system further includes a restoration mechanism, mechanically associated with the platform, the restoration mechanism adapted to repeatably and reversibly restore the platform to a particular position, within 0.5 seconds, within 0.3 seconds, or within 0.15 seconds.
  • the mechanical unit includes a spring, disposed to extend and contract in a plane parallel with respect to a weighing surface of the weighing platform.
  • the mechanical unit includes a hydraulic arm disposed and adapted to provide the resistance to the relative horizontal movement.
  • the mechanical unit includes a pneumatic arm disposed and adapted to provide the resistance to the relative horizontal movement.
  • the mechanical unit includes a spring disposed and adapted to provide the resistance to the relative horizontal movement.
  • the measuring unit is adapted to measure a change in length associated with the relative horizontal movement.
  • the measuring unit includes an extensometer.
  • the extensometer includes a mechanical extensometer.
  • the mechanical extensometer includes an electrical transducer.
  • the electrical transducer includes a strain-gauge device.
  • the electrical transducer includes a linear variable differential transformer sensor.
  • the mechanical unit includes a spring adapted to provide the measurable resistance to the relative horizontal movement.
  • the load cell includes a mechanical strain gauge.
  • system further includes the roadway and the roadbed.
  • a top weighing surface of the platform forms a part of a top surface of the roadway.
  • the platform is angularly positioned away from a normal position with respect to a longitudinal direction of the roadway.
  • the platform is angularly installed in the roadway whereby an angle of rotation a, with respect to the normal position, equals at least 5°, at least 6°, at least 7°, or at least 8°.
  • the angle of rotation a equals at most 25°, at most 20°, at most 18°, or at most 15° degrees.
  • a shape of the platform is a non-rectangular parallelogram.
  • the restoration mechanism includes a rocker.
  • the rocker has a conical body.
  • At least a portion of the secondary restoration mechanism is disposed around the rocker.
  • the secondary restoration mechanism includes a pre-stressed membrane disposed around the rocker.
  • the at least one load cell includes at most eight load cells, at most six load cells, or at most five load cells.
  • the at least one load cell is adapted to be calibrated by a static load.
  • the measuring unit is adapted to be calibrated by a static load.
  • FIG. 1 is a simplified, schematic view of a WIM system according to a first aspect of the present invention
  • Figure 2a is a logical flow diagram according to one aspect of the method of the present invention.
  • Figure 2b is a logical flow diagram according to another aspect of the inventive method.
  • FIG. 3 is a simplified, schematic view of a WIM system according to an embodiment of the present invention.
  • Figure 4 is a schematic exemplary exploded view of a weighing module according to an embodiment of the present invention.
  • Figure 5 is a perspective view of a flexure attached between top and bottom elements of the weighing module
  • Figure 5a shows a horizontal displacement of the flexure of Figure 5
  • Figure 5b shows a vertical displacement of the flexure of Figure 5
  • Figure 6 is a schematic exemplary embodiment of a rocker mechanism of the present invention.
  • Figure 7 is a top, schematic view of a weighing platform according to an embodiment of the present invention.
  • Figure 8 is a plot of vertical and horizontal forces as a function of time, for a wheel rolling on to, and off of, an apparatus of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • FIG. 1 is a simplified, schematic view of a WIM system 100 according to the present invention.
  • WIM system 100 includes a base 110 adapted to attach or anchor to a roadbed, a weighing platform 120 mounted on the base and adapted to receive wheels of moving vehicles such as motor vehicle wheel 50 along a longitudinal axis X of the platform, and at least one load cell 130 disposed between the base and the platform, and adapted to provide load signals indicating loads applied by the wheels on the platform.
  • WIM system 100 also includes a longitudinal differentiation mechanism 150, mechanically associated with the platform and the base.
  • This mechanism may include a mechanical resistance unit (element or assembly) 152 adapted to provide a measurable resistance to a relative horizontal movement between the base and the platform, the movement generally along longitudinal axis X, to differentiate horizontal forces produced by the wheels acting on the platform, and a measuring unit 154, associated with the mechanical unit, and adapted to make a measurement of a parameter associated with the resistance and to produce an output signal relating to the measurement.
  • a mechanical resistance unit element or assembly
  • a measuring unit 154 associated with the mechanical unit, and adapted to make a measurement of a parameter associated with the resistance and to produce an output signal relating to the measurement.
  • Mechanical resistance unit (element or assembly) 152 may include a spring such as a cylindrical or spiral spring, a hydraulic arm a pneumatic arm, or other mechanical resistance unit adapted to measurably resist the relative horizontal movement between the base and the platform.
  • a spring such as a cylindrical or spiral spring
  • measurable resistance a resistance that is repeatable in a manner that enables meaningful measurement of the resistance, so as to enable analysis of the resistance.
  • Measuring unit 154 may include an extensometer.
  • An extensometer is an instrument for measuring changes in length that are caused by application of force. Various types of extensometers are known. Changes in length may be measured directly by some types of devices, such as clip-on extensometers, or indirectly by non- contact or video extensometers.
  • Mechanical or contact-type extensometers may use electrical transducers such as linear variable differential transformer (LVDT) sensors or strain-gauge devices (and sometimes combinations of the two) to generate an electrical signal proportional to change in length or strain.
  • An extensometer system may also incorporate electronics for amplification of small signals.
  • WIM system 100 also includes a processing unit or processor 180, such as a central processing unit (CPU).
  • processor 180 may be configured to receive the load signals from the at least one load cell and the output signal from the measuring unit, and to produce a weight indication based on the load signals and the output signal from the measuring unit.
  • WIM system 100 is preferably equipped with a restoration mechanism such as restoration mechanism 140, which serves to restore a position of weighing platform 120 with respect to base 110, in preparation for another wheel rolling on to weighing platform 120.
  • restoration mechanism 140 includes cupped surfaces on the top and on the bottom of load cell 130.
  • a wheel such as motor vehicle wheel 50 is enabled to roll along a longitudinal axis of platform 120 to produce a dynamic vertical load as well as longitudinal horizontal forces exerted on platform 120 (step 1).
  • the vertical load acts upon at least one load cell such as load cell 130, which produces dynamic vertical load signals corresponding to, or associated with, the vertical load (step 2).
  • WIM system 100 may also measure a parameter (step 3) associated with these horizontal forces, and produce an output signal based on, or related to, this measured parameter (step 4).
  • a processing unit such as processor 180 processes the vertical load signals along with the output signal from step 4 to produce a WIM weight indication.
  • a restoration mechanism such as restoration mechanism 140, which serves to restore a position of weighing platform 120 with respect to base 110, may be activated (step 6) in preparation for another wheel rolling on to weighing platform 120.
  • a WIM system such as WIM system 100 is provided.
  • a wheel such as motor vehicle wheel 50 is enabled to rotate along a longitudinal axis of platform 120 to produce a dynamic vertical load and load signals corresponding thereto, and to produce a relative horizontal movement between base 110 and platform 120 (step 2).
  • the vertical load acts upon at least one load cell such as load cell 130, which produces load signals corresponding to the vertical load.
  • WIM system 100 includes a longitudinal differentiation mechanism, such as longitudinal differentiation mechanism 150 described hereinabove.
  • a mechanical unit (element or assembly) thereof, such as mechanical unit 152, provides a measurable resistance to the relative horizontal movement between base 110 and platform 120, generally along longitudinal axis X of platform 120, to longitudinally differentiate horizontal forces produced by wheel 50 acting on platform 120 (step 3).
  • a measuring unit associated with mechanical unit 152, such as measuring unit 154, makes a measurement of a parameter associated with this measurable resistance and produces an output signal relating to this measurement (steps 4, 5).
  • step 6 a processing unit such as processor 180 processes the vertical load signals along with the output signal from step 4 to produce a WIM weight indication.
  • a restoration mechanism such as restoration mechanism 140, which serves to restore a position of weighing platform 120 with respect to base 110, may be activated (step 7) in preparation for another wheel rolling on to weighing platform 120.
  • the term "extensometer” refers to an instrument for measuring a longitudinal displacement or extension caused by an application of force.
  • Mechanical resistance unit (element or assembly) 152 may include a spring or other resistance units that, at least ideally, approach the behavior delineated by Hooke's law. In the ideal case, the extension produced is directly proportional to the load:
  • F is the restoring force exerted by the material
  • k is the spring constant (in units of force per unit length).
  • FIG 3 is a simplified, schematic view of a WIM system 800 according to the present invention.
  • WIM system 800 includes a base 310 for anchoring to a roadbed 60, a weighing platform 320 adapted to receive wheels of moving vehicles such as motor vehicle wheel 50 along a longitudinal axis X of the platform, and at least one weighing module 305 disposed between the base and the platform, and adapted to provide load signals indicating loads applied by the wheels on the platform.
  • Weighing module 305 may include a longitudinal differentiation mechanism such as longitudinal differentiation mechanism 150 described hereinabove.
  • WIM system 800 may be adapted to simultaneously receive both wheels (or all wheels) of a single vehicle axle.
  • the weighing system may include two or more separate parallel weighing platforms 320 installed in roadway 60, each adapted to receive a single wheel 50 (or in the case of double wheels ⁇ a double wheel on a single side) of a vehicle axle.
  • the weighing platforms prefferably be of sufficient length so as to fully support motor vehicle wheel 50. This is in sharp contrast to various strips or cables of the prior art, which receive— at most— a fraction of the weight exerted by wheel 50, the remainder of the weight being supported by the roadway itself.
  • the weighing platform of the present information may typically have a length of at least 0.50 meters, at least 0.60 meters, at least 0.70 meters, at least 0.80 meters, or at least 0.90 meters.
  • the weighing platform of the present information may typically have a length of at most 2.50 meters, at most 2.30 meters, at most 2.20 meters, at most 2.00 meters, or at most 1.90 meters.
  • the schematic, exemplary embodiment of a weighing module 200 includes a top element 210 adapted to attach to weighing platform 320 (shown in Figure 3), a bottom element 220 adapted to attach to a base 310 (such as shown in Figure 3), at least one load cell such as load cells 230, which may be attached to top element 210, a measuring unit 240 adapted to measure horizontal displacement or forces of top element 210 with respect to bottom element 220, and a processor 250 that may be adapted to receive signals from load cells 230 and from measuring unit 240.
  • Weighing module 200 may further include an overload protector 500, adapted to protect weighing module 200 against excess horizontal forces, a restoration mechanism including rocker mechanism 400 for each load cell 230, and a flexure 300 connecting between top element 210 and bottom element 220. Flexure 300 may serve as part of the restoration mechanism.
  • the horizontal measurement obtained by measuring unit 240 may be used to correct the vertical load cell measurement obtained by load cells 230.
  • Processor 250 may process the received signals, correct for horizontal displacement, and determine the weight of wheel 50 on weighing platform 120.
  • Figure 5 is a schematic diagram of flexure 300 attached between top element 210 and bottom element 220.
  • flexure 300 may be designed to achieve double bending, whereby vertical movements are resisted. Flexure 300 may be further adapted to resist horizontal movement in directions other than parallel to the longitudinal axis of weighing platform 120.
  • Figure 5a shows a horizontal displacement of flexure 300.
  • Figure 5b shows a vertical displacement of flexure 300.
  • the preloading of flexure 300 is typically below 50%, more typically between 10-40%, between 10-30%), or between 10-25%> of platform weight capacity.
  • Some aspects of the restoration mechanism will be described in greater detail hereinbelow.
  • excessive horizontal forces may be stopped by at least one overload protector 500, which is typically attached to bottom element 220 and which may fit inside an opening or recess 510 in top element 210. Vehicles that brake suddenly while approaching the weighing platform may exert excessive horizontal forces on the WIM system, which may break system parts or cause inaccurate weight readings.
  • protector 500 blocks the horizontal forces exerted by top element 210.
  • a restoration mechanism including rocker mechanism 400 may be advantageously disposed between load cell 230 and bottom element 220.
  • FIG 6 is a schematic exemplary embodiment of rocker mechanism 400.
  • a rocker 430 which may be generally conical, may include a rocker head 420 and a spherical base 460.
  • Rocker head 420 may be adapted to fit into a depression 410 on a bottom side of load cell 230.
  • Spherical base 460 of rocker 430 may sit in a spherical or rounded receiving base 470 attached to bottom element 220.
  • Rocker head 420 and spherical base 460 are designed to act, together with flexure 300 (shown in Figure 5 and described hereinabove), as a restoration mechanism.
  • a secondary restoration mechanism may include a pre-stressed membrane 440 adapted to fit over conical body of rocker 430.
  • Membrane 440 is attached to receiving base 470 to prevent vertical displacement in rocker 430.
  • Membrane 440 behaves like a spring in the horizontal direction due to grooves like exemplary groove 450, which gives membrane 440 spring-like properties and measurable displacement in the horizontal direction.
  • Membrane 440 returns rocker mechanism 400 whereby top element 210 and bottom element 220 may vertically realign in their initial position, faster and with more precision than conventional sphere or rocker mechanisms.
  • wheels rolling onto weighing platform may produce sudden horizontal forces, thereby increasing the noise component of both the horizontal and vertical displacement measurements. This noise component causes inaccurate load calculations of the partial vehicle load on the wheel.
  • One solution is to lengthen weighing platform, but this significantly raises the cost of the system, both in parts and installation. Moreover, the natural frequency is lowered, thereby increasing oscillation and reducing weighing precision. Also, the length of the platform may be limited to a length allowing the wheel or wheels of a single axle to be disposed on the platform at any given time.
  • the weighing platform such as weighing platform 120 may advantageously be installed in roadway 60 whereby an angle of rotation a (with respect to a direction perpendicular to roadway 60) preferably equals at least 6°, at least 7°, or at least 8°, and preferably equals less than 25°, less than 20°, less than 18°, or less than 15° degrees. Under these conditions, wheel 50 may alight gradually on to, and off of, weighing platform 120. As a result, noise related to force measurements in the horizontal direction is greatly reduced, thereby increasing accuracy in measurements and subsequent load calculations.
  • existing WIM axle-weighing systems may be characterized by low accuracy (+/- 15-20%) compounded by a finite (non-unity) probability (typically 80%-95%) of achieving that accuracy.
  • a finite (non-unity) probability typically 80%-95%) of achieving that accuracy.
  • the inventive method may determine that a particular weight measurement is within 7% of the true (static) value, with a certainty approaching 100% (as opposed to the 80%-95% achieved in various prior-art technologies).
  • the inventive method may be used to determine, with the same 80%-95% certainty achieved by prior-art technologies, that a particular weight measurement is within only 2% of the true value.
  • a horizontal behavior measuring system could be retrofitted to various existing, prior-art WIM systems, in order to improve the certainty of the weight measurements, and/or to identify particular weight measurements having a particularly high or pre-determined accuracy.
  • Figure 8 is a plot of the vertical force signal F, and the horizontal force signal
  • the load cells begin to receive a portion of the load of the wheel.
  • the load on the load cells substantially plateaus.
  • the load cells receive a decreasing portion of the load of the wheel, until the wheel is completely supported by the roadway.
  • the vertical force signal F is not constant.
  • the average value may be appreciably different from the static (real) weight exerted by the wheel.
  • the processor processes the vertical load signal along with the horizontal force signal to produce a WIM weight indication.
  • the WIM weight indication may be an average weight indication, e.g., taken over a period of time in which the load on the vertical load cells has substantially plateaued.
  • the processor processes the horizontal force signal and may identify at least one time period containing a spike (or other disturbance-related phenomenon).
  • the processor is further adapted to exclude the disturbed time period(s) from a sampling time window W, which is illustratively shown in Figure 8.
  • the vertical force signal F may then be processed solely within sampling time window W.
  • mechanical resistance-measuring unit is meant to include a mechanical resistance-measuring element or a mechanical resistance-measuring assembly.
  • horizontal movement and the like is meant to refer to a movement that is horizontal with respect to the weighing surface of the weighing platform.
  • the term "adapted to be calibrated by a static load” and the like, with respect to a load cell, is meant to exclude piezoelectric elements and other elements that require dynamic calibration, or which calibrate poorly under static load conditions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention concerne un système et un procédé pour peser un véhicule en mouvement sur une route. Le système comporte: (a) une base d'ancrage à la plateforme; (b) une plateforme de pesage montée sur la base et destinée à recevoir la roue du véhicule le long d'un axe longitudinal de la plateforme, celle-ci ayant une longueur d'au moins 0,5 mètre le long de l'axe; (c) une cellule de charge placée entre la base et la plateforme, et destinée à fournir des signaux de charge verticale indiquant les les charges verticales appliquées par la roue sur la plateforme; (d) un mécanisme de différenciation longitudinale, associé mécaniquement à la plateforme et à la base, qui comporte: une unité de mesure de résistance mécanique destinée à fournir une résistance à un mouvement horizontal relatif entre la base et la plateforme, le mouvement se faisant généralement le long de l'axe longitudinal, pour différencier les forces horizontales produites par la roue agissant sur la plateforme, et une unité de mesure, associée à l'unité de mesure de résistance, et destinée à effectuer une mesure d'un paramètre associé à la résistance au mouvement horizontal relatif, et à produire un signal de sortie se rapportant à la mesure; et (e) une unité de traitement destinée à: (i) recevoir les signaux de charge verticale de la cellule de charge, et le signal de sortie de l'unité de mesure, et (ii) mesurer un poids de la roue sur la plateforme par apport d'une compensation d'erreur dans les signaux de charge verticale avec le signal de sortie de l'unité de mesure, pour produire un signal de poids corrigé.
PCT/IB2011/001657 2010-07-17 2011-07-17 Système et procédé pour peser des véhicules en mouvement WO2012010943A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/741,409 US20130220709A1 (en) 2011-07-17 2013-01-15 System and method for weighing vehicles in motion

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US36532310P 2010-07-17 2010-07-17
US61/365,323 2010-07-17

Related Child Applications (1)

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US13/741,409 Continuation-In-Part US20130220709A1 (en) 2011-07-17 2013-01-15 System and method for weighing vehicles in motion

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103323085A (zh) * 2012-03-22 2013-09-25 北京盘天科技发展有限公司 一种车辆动态称重装置

Citations (6)

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Publication number Priority date Publication date Assignee Title
US1831198A (en) * 1928-04-09 1931-11-10 Paul A Sandberg Brake-testing apparatus
US2868535A (en) * 1955-12-21 1959-01-13 Baldwin Lima Hamilton Corp Motion load weighing system
US3871491A (en) * 1973-12-13 1975-03-18 Yamato Scale Co Ltd Axle load meter
FR2275759A1 (fr) * 1974-06-18 1976-01-16 Trayvou Sa Perfectionnements aux ponts-bascules
US4957178A (en) 1989-08-22 1990-09-18 Toledo Scale Corporation Weigh-in-motion scale
US6481298B1 (en) * 2000-11-13 2002-11-19 The University Of Tennessee Research Corporation Vehicle brake testing system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1831198A (en) * 1928-04-09 1931-11-10 Paul A Sandberg Brake-testing apparatus
US2868535A (en) * 1955-12-21 1959-01-13 Baldwin Lima Hamilton Corp Motion load weighing system
US3871491A (en) * 1973-12-13 1975-03-18 Yamato Scale Co Ltd Axle load meter
FR2275759A1 (fr) * 1974-06-18 1976-01-16 Trayvou Sa Perfectionnements aux ponts-bascules
US4957178A (en) 1989-08-22 1990-09-18 Toledo Scale Corporation Weigh-in-motion scale
US6481298B1 (en) * 2000-11-13 2002-11-19 The University Of Tennessee Research Corporation Vehicle brake testing system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103323085A (zh) * 2012-03-22 2013-09-25 北京盘天科技发展有限公司 一种车辆动态称重装置
CN103323085B (zh) * 2012-03-22 2015-09-02 北京盘天科技发展有限公司 一种车辆动态称重装置

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