DE10105832A1 - weighing sensor - Google Patents

Abstract

The invention relates to a weight sensor and a weighing method for the static and dynamic weighing of vehicles or the wheel and axle loads thereof, with a sensor housing, comprising a base plate and a cover, with a measuring arrangement enclosed in a sealed manner as intermediate layer between the above. Said novel weight sensor (1) and the novel weighing method involve a measuring arrangement (6), comprising a measuring field of modular construction, fitted with extension measuring strips, which can be interrogated either individually or by field in a directed manner. The sensor field is thus both mechanically and electronically of modular construction.

Description

The invention relates to a weighing sensor, in particular for static and dynamic weighing of vehicles or their Wheel and axle loads, with a sensor housing that a Bo denplatte and a cover, the interposition of a Measuring arrangement are connected to one another in a moisture-tight manner, includes.

Such a weighing sensor is for example from the WO 97/17597 known. It is a cradle plate that is clamped in a frame, the one tensioned weighing plate acts on a piezo sensor that un below the weighing plate in the on a frame, the cradle plate and a bottom plate enclosed housing inside is embedded in a pressure-transmitting medium.

Such weighing arrangements are used for example for stati and dynamic recording of road loads Vehicles used. In particular, it is about the costly traffic infrastructure of the streets in front of Ober damage to the area, such as that caused by overloading ne axles caused by heavy goods vehicles, too preserve. Developing an accurate and at the same time  against the aggressive loads of road traffic largely insensitive weighing technology stands together with an effort to ensure a fairer allocation of the to Maintenance of transport infrastructure required Costs and expenses depending on the claim to reach the road surface.

Basically, a distinction must be made between static, legal-for-trade and dynamic, if necessary limited, legal-for-trade weighing systems. Static weighing systems can be used in particular for control purposes to protect entire sections of the route against the use of overloaded vehicles. In addition, dynamic Wiegean were known, which were either incorporated directly into the Fahrbahnbe or mobile applied to the road. The following weighing techniques have become known in recent years:

• - Weighing plates
• - Piezo sensors or capacitive stripe sensors
• - Achsplattformwagen

The weighing plates measure the deflection of a weighing plate tensensors by the wheelbase force with one of the cradles plate associated sensor network, either made of piezo measuring elements or strain gauges. The support of the Weighing plates are preferably made on 2 edges or 4 supports gerpunkten.

Piezo sensors or capacitive stripe sensors work either with the piezo effect or with the detection of Changes in capacity due to the force arise from the crossing of a vehicle.  

The calibration platform scales work with so-called force measurement cans or shear force transducers within a bridge kenwaage are integrated.

The weighing plates are both used to carry out dynami suitable as well as static measurements and offer the advantage that the entire tire contact area is covered can be. These are robust measured values takers in the road surface using an ent speaking mounting frame can be installed. It has however, it has been shown that the long-term stability of such Weighing plates are not satisfactory. On the one hand is the qua lity of the measurement result depends essentially on the quality of the Installation of the above-mentioned installation frame in the street and the dependent clamping of the weighing plate in the street dependent. It should be noted that the cradle plate like a spring in the road surface is installed and accordingly the road surface as sol Chen loads and also the clamping of the weighing plate is temperature dependent. The sensor is sensitive Wear of both the sensor and the surrounding road ßenbelags.

So-called piezo sensors mostly consist of a piezo cable that is inserted into a metal rail and into the it is shed. With one of these in the street lay integrated sensor it is not possible to complete Tire contact area. The signal must do this be integrated when rolling over the tire. The sensor is also heavily dependent on the quality of the roads surface and shows a significant discontinuity along of the sensor. The advantages of the piezo sensor are its easy manufacture.  

You therefore have a significant cost advantage over the other measuring systems mentioned. The measurement accuracy of the Axle load measurement is, however, quite imprecise. Beyond that from the life of such sensors is limited. Finally, road bumps affect how Ruts the measurement.

Capacitive stripe sensors are of their size and type the installation after ver with a piezo sensor similar, the measuring principle on the detection of La shifts in the passage of vehicles rests. However, the quality of the measurement also depends here considerably from the installation in the street as well as the circumstances of the Vehicle crossing from.

The structures with metal plate mentioned above on load cells or shear force gauges, including capacitors tive mats and sensors with glass fibers play in the how technology only plays a subordinate role.

The invention is therefore based on the object of a how to create a sensor with an acceptable production cost most dynamic as well as static measurement enables and moreover has calibration capability and with a Accuracy is provided that meets the demands of an over monitoring of road traffic in both dynamic and in static operation is sufficient.

The task according to the invention is achieved by a weighing sensor the characteristics of the main claim and the subordinate Process claim resolved. Advantageous embodiments of the Invention result from the subclaims.  

The fact that in a generic weighing sensor Measuring arrangement is provided, the at least one module carrier with measuring arms to absorb shear forces summarizes, with the measuring cantilever in such a way with strain gauges are equipped that those introduced via the measuring boom Horizontal forces are detected, becomes a robust measuring system used, which also offers the highest accuracy.

The evaluation of the shear initiated during the crossing Forces from horizontal forces have clear advantages compared to the pure weight measurement, the considerable mistake Influences in dynamic measurement due to braking accelerating or accelerating. In addition, he The modular structure permits the adaptation of the measuring arrangement to the respective application in an optimal way. So can be done by simply increasing the number of module carriers Weighing sensor can be enlarged in its weighing area.

In addition, the measuring arrangement according to the invention has a extremely flat structure, which can be easily integrated into the Road surface can be integrated without the roads covering exposed to considerable impairments is. In addition, the module carriers are in the weighing sensor itself supported so that the anchoring of the weighing sensor in the Road surface has no influence on the measurement result. The fla Che construction significantly reduces the installation costs at.

The module carriers are rod-shaped with laterally projecting ones Measuring arms designed so that in the area of the measuring cantilever results in a Y cross-section. This profile the module carrier is ideally suited when crossing initiated shear forces.  

The module carriers are at least within the weighing sensor partially included in grooves and therefore simple but we against dynamic influences due to the stress secured by braking or accelerating. The ent speaking structure is easy to manufacture and in addition, very clearly. The difference to the aforementioned weighing plates requires the fiction, Weighing sensor no separate mounting frame, because the measuring modules do not have to be preloaded or clamped. In this respect, the measurement result is also not in the aforementioned Depending on the installation circumstances of the weighing sensor. Rather, the weighing result of the installation differs The weighing sensor is not significantly different from that not installed Weighing sensor. The advantages in terms of calibration and Ka calibration of an insensitive sensor On the hand.

The dispensable due to the changed measurement principle construction frame enables the installation of the weighing sensor in such a way the road surface that the cover flat with the roads surface closes and the bottom plate is full in the street is stored. This can completely any drainage measures, such as often necessary in connection with weighing plates, who does not the. Furthermore, it is a road surface gentle installation.

The weighing sensor can either be used as a strip sensor or as Matrix sensor by appropriate arrangement of the module carriers being constructed.

The matrix sensor is ideally constructed so that a complete tire flap, either of a single  or a double tire or even a complete axle wide can be included.

The module carriers are each with a measuring board and a Microcontroller. The fact that the evaluation nik publicly connected to the module carrier as such unnecessary cabling is avoided.

In the sense of a construction that is as robust as possible, this is essential che part of the evaluation electronics in the form of integrated Circuits, so-called ASICs, built, which every Y- Module and each strain gauge are assigned. The Structure of the evaluation circuit as an integrated circuit is robust against environmental influences, closes almost every one Manipulation of the measurement result and allowed In addition, simple repair by simply replacing the integrated circuits.

In the sense of a further simplification of the circuit structure the strain gauge circuitry assigned to each Y module combined into a single Y module. This results in considerable savings in terms of wiring as well the bridge extension resistor integrated in the circuit stands. The Y module Asic according to the invention provides a Basic module for operation in connection with four expansion measuring strips that can also be used in other areas.

In order to further simplify the structure of the how several DMS-ASICs, preferably four, are sensed from, on a single board with a common Mi krocontroller combined into a Y-module ASIC. today Powerful microcontrollers can handle the complete signal processing of the combined DMS-ASIC's  take. By reducing the number of microcontrollers a further reduction in the wiring effort as well an increase in signal processing speed enough. After in particular the wiring of such Measuring circuits is susceptible to interference, this also achieved greater robustness of the weighing sensor.

In an ideal configuration, the Y-module ASIC's Units assigned to a Y module carrier with the sem combined into a functional unit and with a common Y module processor connected. This Y module processors are then connected to a main processor that is responsible for the entire weighing sensor is responsible via an ent speaking BUS system connected. With such an out Each Y module carrier is therefore self-sufficient Functional unit trained. This enables a cradle to be weighed sor be built up in a simple manner that the required number of Y module carrier functional units in the Weighing sensor used, interconnected via a BUS and with a corresponding common signal processing is provided. This modular construction corresponds to the modern one Manufacturing ideal of a modular principle that always same elements ultimately for the desired user case can be put together.

The weighing sensor is in a further embodiment of the Erfin with a temperature sensor and / or at least one Induction loop to record the direction of travel or Vehicle presence and / or ambient temperature in data connection. The consideration of temperature influences increases the accuracy of the weighing. The detection of a Vehicle presence allows the weighing sensor to be used as needed switch on and off or depending on the vehicle speed  between different operating modes, so for example a static or dynamic measurement with different accuracy requirements divorce. As a result, the signal processing effort and thus the energy requirement of the weighing sensor for each Can be adjusted in an optimal way.

The object of the invention is also by a Ver drive solved, in which of the measuring arrangement described Data delivered read, saved, processed Tet and be passed on, the reading, Abspei Saving and processing the data at least essentially by means of a sensor unit, each of which is common with module carriers equipped with strain gauges are a functional unit of the weighing sensor and then the digitized data via a BUS to one Pass on the main sensor.

The method according to the invention thus sees a module or Array-wise processing of the measurement data before then preprocessed accordingly to the main processor Further processing will be forwarded.

This method is particularly suitable in combination used with the weighing sensor described above be because the force transmission into each sensor the time in connection with the position of the respective sensor is detected. This results in a vehicle crossing a pressure distribution rollover profile, as in the previous Integral acquisition of such measured quantities so far not he could be fathered. So the result is a pressure curve the crossing recorded according to space and time. This is what it is about  are measured and not interpolated histories won on or integration.

A pressure distribution profile can be used for static measurements be determined. This information is especially for Tire manufacturers valuable. The new weighing process therefore leads in connection with the new weighing sensor to measurement results of previously unknown quality and quality say power.

In the method according to the invention, there are advantageously three operating modes:

• - static
• - static and dynamic
• - dynamically

distinguished. In static weighing operation, every wheel measured individually and one after the other. The static-dynamic Weighing operation concerns a slow vehicle crossing in Range from 0 to 20 kilometers per hour. The dynamic how The process takes place with sensors in the street area be integrated and covers a speed range from 0 to 160 kilometers per hour. For all three companies one in connection with the aforementioned cradle is sufficient sensor a static calibration because of the in the road surface built-in sensor no significant deviations against over the factory-supplied sensor.

The distinction between the different operations arten makes it possible to assign the signal processing effort to the to optimally adapt each task.  

The measurement data of any unloaded sensors will be summarizes, but can reduce the signal processing walls selected with advantage before further processing become. This optimizes the processor and memory worked.

However, the unloaded sensors will at least become yours Position after detected so as to gain a measurand that the tire contour corresponds and / or due to special circumstances the crossing or uprising. So can for example, whether a vehicle tire is only recognized partially stands on the weighing sensor.

In a further embodiment, by means of before and / or after switched induction loops a possible vehicle prep recognized and thereby the data processing process off and / or on. This avoids that nonsensical data, for example zero data and processed in an energy-intensive manner.

In an alternative embodiment, a vehicle presence also with the front and / or rear in the direction of travel Sensors of the weighing sensor are recognized and as a result of this Detection of the data processing process off and / or on be switched. The procedure is otherwise analogous to that Operation in connection with upstream and / or downstream Induktionsmeßschleifen.

In a further advantageous embodiment, between measuring Different modes of a normal measurement and a detailed measurement the. In normal operation, the tires are pulled order measured values integrally compressed and put together in this way saved. Only in the case of a detailed measurement  specified or adjustable conditions the data of the individual sensors are saved and transmitted for further processing.

Even with static or static-dynamic weighing the measured values of the individual sensors become mean values in tegrated and stored and processed in this way.

The method according to the invention can be accurate be improved in that temperature data, calibration tables or active calibration processes and a correction any zero drift in the process be tested.

For control and test purposes, the measured values are not in manipulable way with a time and / or location stamp provided and saved.

These timestamps can lie next to each other when arranged gender weighing sensors are used to measure their results if necessary to synchronize. Such axis widths can and / or axle loads are correctly determined.

The invention is described below with reference to the drawing illustrated embodiments explained in more detail. It shows gene:

Fig. 1 position a weighing sensor in a perspective Dar,

Fig. 2 shows a detail of the weighing sensor in perspektivi shear exploded view,

Fig. 3 is a wiring of a strain gauge measuring point,

Fig. 4 shows the wiring of a Y module with four strain gauges in a block diagram and

Fig. 5 shows a circuit structure of a weighing sensor overall in a schematic block diagram representation.

The weighing sensor 1 shown in Fig. 1 consists wesentli surfaces of a base plate 2, which is connected via retaining strips 3 with a cover 4. In the case of the cover 4, it is in the present example a stainless steel plate which is screwed to the base plate 2 for side fastening flanges 5 . Instead of a screw connection, the base plate could also be welded moisture-tight to the cover 4 . The design of the cover 4 as a stainless steel plate represents effective corrosion protection.

The serving as cover 4 stainless steel plate has a U-shaped profile, so that according to the exploded view in Fig. 2 between the base plate 2 and the cover 4, a space for receiving a measuring arrangement 6 is gebil det. The measuring arrangement 6 essentially comprises so-called Y-module supports 7 , which are partially embedded in anchoring grooves 10 of the base plate 2 . The Y module carrier 7 has a rod-shaped basic profile with the measuring arms 11 projecting laterally. The designation of the Y module carrier 7 essentially comes from a Y-shaped cross section in the area of the measuring boom 11 . The measuring arms 11 are equipped on both sides with strain gauges in a manner known per se, which are not shown in FIG. 2. Two on the same basic profile oppositely arranged side measuring boom 11 are referred to as Y module 12 , which consists essentially of two lateral Messaus layers, each equipped with two strain gauges.

The weighing sensor 1 shown in FIGS . 1 and 2 represents a matrix sensor in the sense of the invention. However, measuring arrangements are also conceivable which consist only of a single Y module carrier 7 or of Y module carriers 7 arranged in series. As a result, a strip sensor can also be formed as part of the invention.

The dimensions of the matrix sensor are designed such that a complete tire contact, that is to say the surface of a single or multiple tire, can be completely accommodated on the matrix sensor. In this case, when standing on or when crossing through the thin stainless steel cover 4 , weight forces are transmitted which lead to torsion of the lateral measuring boom 11 and thus to the formation of horizontal forces which streak an electrical signal of the strain gauges attached to the measuring boom 11 , the is proportional to the deflection of the measuring boom 11 .

The wiring of the strain gauge 13 is shown in Fig. 3. According to FIG. 3, each strain gauge 13 is assigned an ASIC (application-specific integrated circuit). Each strain gauge 13 is connected in connection with a bridge resistor 14 , an ohmic voltage divider 15 and a clocked supply voltage 16 , which is operated via the voltage divider 15 , switched. The bridge resistor 14 , the voltage divider 15 and the voltage supply 16 are arranged on Meßplati ne, which is assigned to each Y-module carrier 7 . The measuring board is each equipped with a number of strain gauges 13 corresponding to the number of strain gauges Asics 17 . The strain gauge 13 is arranged directly in the area of the measuring board of the associated ASICs 17 , so that the wiring effort is minimized. The assigned to each strain gauge 13 strain gauge ASIC comprises an amplifier 20 , an analog / digital converter 21 , an electronic filter 22 , a memory element 23 , a processor 24 which controls the analog digital conversion, the electronic filter element and the memory element 23 and a bus interface digit 25 controls for forwarding the digitized preprocessed measured values.

An improved version of the measuring electronics of the weighing sensor 1 is shown in Fig. 4. The strain gauges 13 belonging to a Y module 12 are connected to a common strain gauge Asic 17 '. The advantage of this common wiring is in particular the saving of some electronic components or software modules that can otherwise be implemented multiple times.

As shown in Fig. 4, the strain gage can strip 13 of a Y-module 12 with a common Prozes sor 24 ', a single electronic filter element 22', a single memory 23 'as well as with a common bus-stop 25' are supplied. Only the amplifiers 20 'and the analog / digital converter 21 must be provided separately for each strain gauge 13 . The BUS interface 24 'should, however, be operable in a multi-channel operation, so that the results of a single strain gauge 13 can be specifically queried. The sensor unit assigned to a Y module 12 is referred to hereinafter as the Y module sensor unit 26 .

All, a Y-module carrier 7 assigned Y-Sensorein units 26 can be angeord net on a single measuring board 27 and thus with a common voltage supply 16 'and a common voltage divider 15 ' operated. The measuring board 27 is so long stretches arranged on the Y-module carrier that the strain gauges 13 are each arranged in the immediate vicinity of their corre sponding strain gauges Asics. Here, the wiring effort for connecting the strain gauges 13 is minimized. The Y sensor units 26 are connected to a Y module processor 28 via a data bus. The Y module carrier 7 form in conjunction with the measuring board 27 a completed functional unit, which are connected via a suitable BUS interface, preferably an RS 485 parallel interface 30, to a main processor 31 of the weighing sensor 1 . In addition, it is shown in an enlarged view how the BUS interfaces 25 of the Y module sensor units 26 are in data connection with the respective Y module processor 28 .

The main processor 31 can be connected to other sensor units, such as induction loops or temperature sensors, in a manner not shown.

Thus, the modular structure of a matrix is above described in mechanical and electronic terms ben.

The high accuracy of the measuring arrangement results from the electronic and mechanical independence of the individual measuring points from environmental influences, as well as from their number and dimension, which can be precisely adapted to the respective requirement. The amount of data generated can be adapted to the individual case as required by switching on and off each required or not required sensor. Finally, the accuracies can also be adapted to the desired need by using different clocking and evaluation methods. As a result, the storage and energy requirements of the weighing sensor 1 can be precisely coordinated.

Finite element calculation methods have proven that the accuracy of the measuring arrangement described above clearly exceeds the previously known standards and, moreover, that the weighing sensor 1 can be calibrated.

LIST OF REFERENCE NUMBERS

1

weighing sensor

2

baseplate

3

retaining strips

4

cover

5

mounting flange

6

measuring arrangement

7

Y-module carrier

10

anchoring

11

Meßausleger

12

Y module

13

strain

14

bridge resistance

15

voltage divider

16

power supply

17

Strain gauges ASIC

18

Y-module ASIC

20

amplifier

21

ADC

22

Electronic filter element

23

Storage

24

processor

25

BUS interface

26

Y-module sensor unit

27

measuring board

28

Y-module processor

30

RS-485 bus interface

31

main processor

Claims (24)

1. Weighing sensor, in particular for static and dynamic weighing rule of vehicles or their Rad- and Achsla most, with a sensor housing, comprising a base plate ( 2 ) and a cover ( 4 ), with the interposition of a measuring arrangement ( 6 ) moisture-proof are connected to each other, characterized in that the measuring arrangement ( 6 ) comprises at least one module carrier ( 7 ) with measuring arms ( 11 ) for absorbing shear forces, the measuring arms ( 11 ) being equipped with strain gauges ( 13 ) in such a way that the over the measuring arm ( 11 ) initiated horizontal forces are detected. 2. Weighing sensor according to claim 1, characterized in that the module carriers ( 7 ) are each rod-shaped with laterally projecting measuring arms ( 11 ) in such a way that the cross section of the module carriers ( 7 ) in the region of the measuring arms ( 11 ) is essentially Y-shaped and this area each represents a Y module ( 12 ). 3. Weighing sensor according to claim 2, characterized in that the base plate ( 2 ) of the weighing sensor ( 1 ) has one or more anchoring grooves ( 10 ) for receiving the rod-shaped lower part of the module carrier profile when the module carrier ( 7 ) is installed as intended. 4. Weighing sensor according to one of the preceding claims, characterized in that the weighing sensor can be integrated into the road surface in such a way that the cover ( 4 ) closes flat with the road surface when the installation is as intended and the base plate lies snugly on a road base. 5. Weighing sensor according to one of the preceding claims, characterized in that the measuring arrangement ( 6 ) for forming a strip sensor has one or more module carriers arranged in series ( 7 ) or the measuring arrangement for forming a matrix sensor has a plurality of module carriers ( 7 ) arranged in parallel. 6. Weighing sensor according to one of claims 1 to 4, characterized characterized in that the weighing sensor as an area sensor is designed such that the dimensions of the cradle sensors at least to record a complete Tire or multiple tire flats or an entire Sufficient axis width. 7. Weighing sensor according to one of the preceding claims, characterized in that each module carrier is connected to a measuring board ( 27 ) and a module processor ( 28 ). 8. Weighing sensor according to claim 7, characterized in that a Y module ( 12 ) comprises four strain gauge ASIC's ( 17 ), each strain gauge ASIC ( 17 ) being assigned a strain gauge ( 13 ) and each strain gauge ASIC ( 17th ) has an AD converter ( 21 ), an electronic filter element ( 22 ), a memory element ( 23 ), a processor ( 24 ) and a BUS interface ( 25 ) and each DMS-ASIC ( 17 ) on the measuring board ( 27 ) of the corresponding Y module ( 12 ) is arranged. 9. Weighing sensor according to claim 8, characterized in that all, preferably four, a Y module ( 12 ) associated DMS-ASIC's ( 17 ) are combined to form a Y-module ASIC ( 18 ). 10. Weighing sensor according to claim 9, characterized in that several preferably four Y-module ASICs ( 18 ) with a common amplifier ( 20 '), a common processor ( 24 '), a common filter element ( 22 ') and a common memory element ( 23 ') and a single BUS interface ( 25 ), which is preferably designed for multi-channel operation, are combined to form a Y-module sensor unit ( 26 , 26 '). 11. Weighing sensor according to claim 10, characterized in that all of a Y-module carrier ( 7 ) associated Y-module sensor units ( 26 ) on the common measuring board ( 27 ) with a common Y-module processor ( 28 ), a common Voltage dividers ( 15 ') and a common power supply ( 16 ') are combined into a single functional unit, which are connected via a bus interface ( 30 ) to a main processor ( 31 ), which is preferably connected to other functional units. 12. Weighing sensor according to one of the preceding claims, characterized in that the main processor ( 31 ) is additionally data-connected to at least one temperature sensor and / or at least one induction loop, which are arranged in the direction of travel in front of and / or behind the weighing sensor ( 1 ) , 13. Weighing method, in particular for static and dynamic weighing of vehicles or their wheel and axle loads, in which the data supplied by a measuring arrangement ( 6 ) is read, stored, processed and passed on, the reading, storing and processing the data takes place at least essentially by means of a module sensor unit ( 26 ) which, in conjunction with further sensor units ( 26 '), is assigned to a module carrier which is combined with strain gauges ( 13 ) to form a functional unit, where the digitize within this functional unit th data via a BUS to a main processor ( 31 ) for further processing. 14. Weighing method according to claim 13, characterized in that that the force acting on each sensor is about the time in connection with a location information of the sensor concerned and another signal processing is fed.   15. Weighing method according to claim 13 or 14, characterized in that the weighing method between three types of operation

• - static
• - static-dynamic
• - dynamic

different. 16. Weighing method according to one of claims 13 to 15, there characterized in that in the weighing process not loaded sensors or sensor units or Sensor unit arrays captured and processed by processing can be excluded. 17. Weighing method according to claim 16, characterized in that that in addition to evaluating the loaded sensors, the tire size is recorded in such a way that the Location of the loaded and not loaded sensors recorded and fed to a further evaluation. 18. Weighing method according to one of the preceding claims 13 to 17, characterized in that by means of and / or redesigned induction loops a drive presence and thus the data processing tion process is turned off and / or on. 19. Weighing method according to one of the preceding claims 13 to 17, characterized in that by means of the Direction of travel front and / or rear sensors one Vehicle presence is recognized and dependent on this detection of the weighing data processing process off and / or on.   20. Weighing method according to one of the preceding claims 13 to 19, characterized in that between little at least two measurement modes of a normal measurement and a De a distinction is made between, with the normal measurement integrally the measured values assigned to a tire be summarized and saved and at a De tail measurement recorded the data of the individual sensors, ge saved and passed on. 21. Weighing method according to one of the preceding claims 13 to 20, characterized in that the static and the static-dynamic weighing the measured values Mean values are integrally summarized and only these with tel values are processed further. 22. Weighing method according to one of claims 13 to 21, there characterized in that by means of measured data, especially the temperature, and / or stored data ten, especially calibration tables, and / or acti ver calibration processes, especially the setting a zero point drift, a correction of the determined Measured values are carried out. 23. Weighing method according to one of the preceding claims 13 to 22, characterized in that the stored Measured values each with a digital time and / or Place stamps, its setting in each case is not accessible.   24. Weighing method according to claim 23, characterized in that that the measured values are next to each other in the direction of travel ordered weighing sensors to match any Checked timestamp and results with the same Timestamp To determine an axis width and / or Axle load can be summarized.