DE102008046907A1 - Measurement results detection and transmission device for wheel set of rail-vehicle, has stator electronic circuit comprising receiver connected with universal serial bus, which is coupled with data detection and analysis unit - Google Patents

Abstract

The device has sensors (19) i.e. resistance strain gauges, for detecting forces developed during driving. A rotor electronic circuit (11) is inductively connected with a receiver of a stator electronic circuit (24) by a remote controlled scanning clock and a data coupler. The receiver is connected with a universal serial bus (USB)(31) or an Ethernetinterface, and with an external rotation angle transmitter by a rotation angle converter. The USBor the Ethernetinterface is coupled with a data detection and analysis unit.

Description

The The invention relates to a device for detection and transmission of measurement results on a wheelset of a rail vehicle, wherein on the wheel discs and possibly the wheelset at a distance different Radial sensors, in particular strain gauges, for detection arranged by occurring during driving forces are.

A measuring wheel set is known which makes it possible to determine the horizontal forces between wheel and rail independently of the wheel attachment point for rail vehicles ( DE 42 18 929 C1 ). For this purpose, sensors (strain gauges) are arranged per wheel disc on at least two measuring radii, these sensors being interconnected in bridge circuits. Preferably eight sensors are arranged per radius, with four sensors on the inside of the wheel and four sensors on the outside of the wheel.

From the DE 10 2005 051 493 B3 is another set of measuring wheels known, in addition to the above sensors eight further sensors are mounted on the wheel disc, which are applied in each case 45 ° offset from the previous sensors and are summarized in two more Wheatstone measuring bridges. Depending on the requirements or design of the wheel set, sensors are applied to the wheel disc on at least one and up to four radii, which are assigned to two different coordinate systems. Two linearly independent equations are used per radius for determining the forces.

at both o. g. Meßradsätzen is the output cable over a transverse bore in the center of the hollow-bored axle and then on the front side over a digital bridge of light (Telemetry with amplification, digitization, filtering) from rotating to standing system. By the Cross hole, the wheelset is no longer durable and must be in certain Mileage intervals through an ultrasound examination Cracks are examined. He is also after the trial runs no longer applicable for regular traffic and must be replaced become. For the customer (vehicle manufacturer or operator) the disadvantage arises that for a short period of time Testing of vehicles valuable wheelsets permanently be bound.

Also known is a transmission device for the wireless transmission of at least one measured value, such as pressure, temperature, imbalance, etc. associated signals from motor vehicle wheels to a relatively fixed warning signal device via at least two inductively or capacitively coupled coupling elements, one of which is attached to the relevant vehicle and circularly coaxial with the wheel axis, while the other coupling element is arranged on the relatively stationary vehicle part ( DE 1 946 627 ). The coupling elements or the respective vehicle wheel are housed in a ring of electrically and magnetically non-conductive, but weather-resistant material, such as rubber or plastic, which is arranged on the vehicle laterally outside or with a small distance to the rim edge and with the rim and / or Tire cover is connected. The device should only be used on a motor vehicle and not on a rail vehicle.

A method and an arrangement for determining the flattening of the wheels on rail vehicles is known (US Pat. DD 88 958 ), wherein a circuit comprises a first wheel to be examined and a part of a first rail such that the contact point between the peripheral surface of the wheel and the rail forms part of the circuit and the current interruption due to a flattening of the wheel is evaluated as an indication of this flatness , An interruption of the circuit as a result of a Radabflachung can be determined that the voltage drop is determined at a part of the impedance or by inductive determination of the current in the circuit. The device and method can not be used on a measuring wheel set of a rail vehicle.

In front The development of rotational telemetry has been made by slip ring transformers used. These are still found today in some measuring wheel set manufacturers and operators application. The transmission path from the wheelset to the Meßradsatzrechner but is carried out analogously and thus prone to failure. In addition, the Schleifringübertragertechnik prone to failure and maintenance-intensive.

More modern Systems work with a radio-based transmission of Signals from the rotating wheelset to the stationary receiver. This non-contact transmission requires per Wheels a transmission frequency, which in the rate of several wheelsets and transformers to confusion can lead. The radio transmitter works completely self-sufficient and is therefore powered by a battery with energy. this leads to to a frequent and multiple battery replacement, which in particular Under the vehicle problematic perform without a pit is. The quality and reliability of such Systems are therefore suitable for use in measuring wheel sets the Deutsche Bahn AG unsuitable.

The invention has for its object to develop a measuring system that requires no fixed wiring through holes in the axle, is completely self-sufficient energy and a si clocked scanning of all sensors - preferably angle-dependent, but also time-dependent, allows.

• – der Empfänger über eine Datenschnittstelle sowie
• – ein externer Drehwinkelgeber über einen Drehwinkelkonverter in einem Winkeltakt

mit einem Mux-USB- oder ethernet-Interface verbunden ist, welches über einen USB oder ethernet mit einer Datenerfassung- und Analyseeinheit gekoppelt ist.This has been achieved according to the invention in that a rotor electronics arranged at different - preferably 12 - rotating measuring points is inductively connected via a remote controlled sampling clock by means of inductive energy and data coupler with a permanently installed receiver of a designed as an RF generator stator electronics, said

• - The receiver via a data interface as well
• - An external rotary encoder via a rotary angle converter in an angular cycle

connected to a Mux USB or ethernet interface, which is coupled via a USB or ethernet to a data acquisition and analysis unit.

The Measuring signals become inductive between rotating and stationary Transfer system part. This will be a ring on the rotating Wheel set and a receiver housing, for example attached to the wheelset bearing housing, ie a non-rotating component. From the receiver housing, the power becomes inductive Transfer to the wheelset and the measuring equipment located there electrically supplied. The voltages generated at the wheel set become also inductive to the receiver in the receiver housing and Wired from there for further processing in the car body transferred. The real challenge here is the connection the system wheel set / axle box is because the system Both must be mountable, as well as high demands on the Cultivation of the receiver provides a clean transmission to ensure the energy in the wheelset. The air gap between the receiver housing and the rotating one Ring may only be a few millimeters. Except that needs the entire transmission electronics (analog / digital conversion, Reinforcement, anti-aliasing filtering) vibration resistant be applied in the ring.

Of the Angle clock is released to a sampling of the measuring point in one Dialer grid set. This has to date hitherto Scanning in the millisecond range has the advantage that no error-prone Interpolation by fitted equations that dependency the (Wheatstone) bridge voltage from the angle of rotation of the Describe cycling done.

Further advantages of the invention:

• - It can work on all holes on the wheelset, the only because of the Meßradsatztechnik so far required to be waived
• - The wheelset is after the experiments reusable for regular operation by the rotor ring is dismantled
• - By the induction of the for the measuring system Required energy, may apply to the attachment of batteries as an energy source to be waived (cost reduction)
• - It can be a high accuracy of the measured data transmission be performed at 16-bit level
• - The effort to calibrate the wheelsets and software creation is due to the angle-based sampling considerably reduced.
• - Uncertainty components due to the interpolation the fit equation will be minimized.

The Invention will be based on an embodiment be explained in more detail.

there demonstrate:

1 - The block diagram of the measuring device

2 - The rotor ring and the stator in longitudinal section

3 - The rotor ring in cross section

1 shows the block diagram of the device. In the stator electronics 24 will be the settings for zero point 28 , Reinforcement 29 and calibration 30 made by the HF generator 25 the high-frequency voltage that goes to the rotor electronics 11 is transmitted. About keyboard 32 and display 33 the information can be integrated into the system and checked. The wireless inductive transmission becomes energy 21 as well as parameters for remote calibration 22 and measuring range setting 23 transfer. In the rotor electronics 11 become zero point and gain setting 16 and 17 the amplifier 15 as well as the calibration of the measuring points 18 performed. From the high-frequency voltage is through power supply 12 the supply voltage for the sensors 19 generated. The measuring signals are according to their amplification 15 converted by the A / D converter, modulator / demodulator for inductive transmission and after inductive transmission in the stator electronics 24 through the modulator / demodulator, D / A converter 26 again converted to an analog output voltage in the amplifier 35 is amplified and then as a measurement signal 34 can be tapped.

2 shows the rotor ring 1 and the stator antenna 2 in cross section. The rotor ring 2 consists of two half-shells 3 and 4 together, over a bracing device 5 be connected to each other. Between the rotor ring 1 and the stator antenna 2 is the 2 to 5 mm wide air gap 6 at orderly. The rotor ring 1 is on the axle 7 attached. The stator antenna 2 has the cable socket 8th and the attachment 9 on.

3 shows the rotor ring 1 with its half-shells 3 and 4 and the tensioning devices 5 as well as the sensor signal amplifier 10 in cross section.

1

rotor ring

2

Stator

3

upper half shell

4

lower half shell

5

tensioning device

6

air gap

7

axle

8th

cable socket

9

attachment

10

Sensor signal amplifier

11

rotor electronics

12

power supply

13

A / D Converter, modulator / demodulator

14

logic

15

programmable amplifier

16

12bit Zero adjustment

17

12bit gain adjustment

18

calibration

19

sensor voltage

20

Ground

21

power supply

22

remote calibration

23

Span Adjustment

24

stator electronics

25

HF generator

26

Modulator / demodulator, D / A converter

27

Logic μP

28

zero

29

reinforcement

30

calibration

31

USB

32

keyboard

33

display

34

measuring signal

35

Amplifier, filter

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4218929 C1 [0002]
• - DE 102005051493 B3 [0003]
• - DE 1946627 [0005]
• - DD 88958 [0006]

Claims (5)

Device for detecting and transmitting Measurement results on a wheelset of a rail vehicle, wherein on the wheel discs and possibly the wheelset shaft at a distance of different radii Measuring sensors, in particular strain gauges, for detection arranged by occurring during driving forces are, characterized in that one rotating at different Measuring points arranged rotor electronics via a remote-controlled Sampling clock by means of inductive energy and data coupler with a Permanently installed receiver designed as an HF generator Stator electronics is inductively connected, wherein - of the Receiver via a data interface as well - one external rotary encoder via a rotary angle converter in an angle clock with a mux USB or ethernet interface which is connected via a USB or ethernet with a data acquisition and analysis unit is coupled. Device according to claim 1, characterized in that that the angular clock on a sampling of the measuring point in a free selectable grid is set. Device according to claim 1, characterized in that that the stator electronics has a stator antenna, which with a Receiver antenna equipped and a high-frequency generator is connected and high-frequency energy flow into the rotor antenna couples. Device according to claim 1, characterized in that that the rotor electronics have a preferably two-part rotor ring constructed as an induction loop (rotor antenna) and is mounted on the measuring wheel set shaft or wheel wheel. Apparatus according to claim 1 and 4, characterized in that the rotor ring has a sensor signal amplifier which is separate for all (Wheatstone) full bridges at the wheelset the amplification and digitization of the bridge voltage in at least 16 bit resolution and 14 bit accuracy.