Kuuden komponentin rengas-anturi

tarkka • kestävä • nopeasti käyttövalmis

Säänkestävä rengas-anturi ajokokeisiin

Dynaamisissa koeajoissa uusi WFT-Cx rengas-anturi mittaa huipputarkasti momentit ja ajoneuvoon kohdistuvat voimat kuudessa suunnassa. Anturi on herkkä, mutta silti lujatekoinen. Suljettu rakenne suojaa anturia lialta, vedeltä ja lumelta, jolloin sitä voidaan käyttää säässä kuin säässä.

WFT-Cx anturi yhdellä silmäyksellä:

  • Mittaa voimat ja momentit pyörivästä renkaasta X-, Y-, Z-suunnissa
  • Tulos sekä ajoneuvon että renkaan koordinaatistossa
  • Häiriösietoinen ja tarkka, anturissa tehtävän digitalisoinnin ja laskennan ansiosta
  • Tarkka lämpökompensointi
  • Kestävä anturiosa joka säilyttää tarkkuutensa pitkään
  • Turvallinen rakenne, josta rengas ei irtoa anturin murtuessa

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  Data Sheets & Manuals

Uutta: Kevyempi WFT-Cxs malli pienautoille

Product Catalog

imc Product Catalog

Seven Good Reasons Why the WFT-Cx Is the Right Choice

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From compact cars to SUVs and light trucks

The 6-component Wheel Force Transducer WFT-Cx can be used on small cars with a rim diameter from 13 inches up to SUVs and small trucks with a hub diameter of up to 5.5 inches. In addition to its waterproof construction, it features shock resistance up to 100 g, thus allowing for the first time testing over "speed bumps". The cooling-optimized design combined with excellent heat conduction from the aluminum WFT sensor housing avoids excessive heat input, even in the case of full braking. For example, over 20 braking tests (acceleration to 150 km/h followed by full braking) were carried out with the WFT: the temperature of the WFT sensor housing did not exceed the 50° C limit. The entire signal processing is designed for temperature between -40° C to + 105° C. All of this results in a much broader application spectrum, which now also includes braking, comfort and tire testing with using the same WFT configuration.

Acquire load collective data from prototypes

prototypes equipped with CAEMAX WFT

In the development of new vehicles, there are often no suitable load collective data for determining the real stress on the components during operation. These must be determined by means of test drives. The WFT from imc can be used for wheel sizes from 13" and is proven by its robust, waterproof design, even during multi-day testing. The measured values are precisely temperature-compensated by means of thermosensors distributed throughout the wheel.

Fatigue testing on the test stand

component lifetime testing on the test stand with WFT

A WFT for component lifetime testing on the test stand must be durable. Especially for these applications, imc offers WFT sensor housings made of titanium or steel. If a rotating measurement is carried out on a chassis dyno or on a road test, the wired signal transmission to the control unit is simply replaced by a stator with telemetric transmission. Since all of the WFT sensor housing types have the same shadow mask, existing adapters can be used for all types.

Function trials during winter

wheel force transducers

Negative temperatures, melting water, ice and snow are a challenge for every measurement system. The WFTs imc have a wide temperature range: WFT-Cx -40° C ... +105° C. In addition, their waterproof design allows test drives to be conducted in any weather condition – even on ice, snow or meltwater. Furthermore, thanks to its robust design and impact resistance of up to 100 g, testing over rough terrain is no longer an obstacle.

Extra lighter WFT-Cxs variant

The proven 6-component WFT-Cx from imc is now also available for small cars with rims from 13 inches in size. Especially in small cars, where the weight often plays a crucial role, this task can now be met by the considerably lighter WFT-Cxs variant - and with almost the same strength. It simplifies the testing and measuring of load profiles, driving dynamics or braking in all applications where weight plays a decisive role.

 

Suitable for many different vehicle types

With the  adapter system from imc, WFTs can be mounted with minimum effort on different vehicle types. The WFT sensor housing, telemetry module and adapter can be combined as desired. This covers a wide range of wheel sizes and vehicles. A quick system set-up and convenient software functions, such as zero calibration, allow the system to be test-ready within a very short time.

Easy mounting: wheel force transducer
Easy mounting: wheel force transducer
  1. Hub adapter:
    The hub adapter connects the WFT to the vehicle. It can be used for different types of vehicles, as long as the bolt circle and the wheel offset are the same. With just a few hub adapters, an entire vehicle fleet can be covered.
  2. Rim adapter:
    As with a conventional rim, the rim adapter serves as a mount for the tire. The rim adapter is not directly specific to the vehicle, but depends on the tire. This allows it to be used on different vehicles with the same tire size.
  3. WFT sensor housing:
    The WFT sensor housing connects the hub adapter and the rim adapter to each other. These three components together form the vehicle-specific wheel. Since the calibration factors are permanently stored in the sensor, you can recombine adapters and sensor housings at any time without having to calibrate the wheel again. Thus, based on a modular design, a WFT-Cx Wheel Force Transducer can be adapted to the vehicle in a time-saving, space-saving and cost-effective manner.

Simple installation

The installation of a WFT-Cx is almost as easy as a wheel change - four WFTs can be mounted in one hour. Thanks to an uncomplicated system set-up and convenient software functions, such as the zero calibration, the system can be test-ready within a very short time.

Integrated intelligence

Thanks to digital signal processing, the 6-component WFT-Cx has considerably less strain gauges than comparable systems. Instead of a complex and fault-prone analog interconnection of strain gauge signals, digital online processing is applied with 24-bit DSP resolution. The resulting higher dynamics of measurement signals allow for tests of comfort performance as well as measurements over rough terrain.

Technical data

 WFT-CxWFT-Cxs
Material AluminumTitaniumSteel PH17-4Aluminium
Measurement principleTemperature compensated strain gauge application
Measurement ranges: ForcesFx, Fz = ±45 kNFx, Fz = ±60 kNFx, Fz = ±60 kNFx, Fz = ±25 kN
 Fy = ±25 kNFy = ±30 kNFy = ±30 kNFy = ±20 kN
Measurement ranges: Torques Mx, My, Mz = ±8,75 kNmMx, My, Mz = ±10 kNmMx, My, Mz = ±10 kNmMx, My, Mz = ±6 kNm
Protection classIP66, IP67
Sampling rate per channelup to 5 kHz
Angular resolution with 5000 increments 0.072°
Accuracy<0.2% FS
Hysteresis<0.2% FS
Crosstalk<0.2% FS
Low pass filter6-pol Butterworth filter (cut-off frequency 1200 Hz)
Weight w/o adapter (appx.)7.5 kg10.5 kg17.5 kg5,9 kg
Rim diametermin. 14" (356 mm), 13" by request
Hub diameter with adaptermax. 5.5"
Operating temperature -40° C to +105° C
Mechanical loadStress analysis according to BMW QV 36026
Shock proofmax. 100 g
RPMmax. 2300 rpm (ca. 278 km/h)
SafetyMechanical breakage protection
Dimension: outer diameter (w/o adapter)317.5 mm
Dimension: inner diameter (w/o adapter)203 mm
Dimension: height76 mm61,5 mm
Temperature drift0.005% / °C
Mounting bolts32
AdaptionCustomer-specific adaption for any vehicle possible

Accessories

WFT interface

The WFT-2-Modul for the imc CRONOSflex is used for the supply and data acquisition of WFT wheel force transducers. It is simply clicked on an imc CRONOSflex system and is automatically synchronized with all other connected sensors, field buses, GPS systems, etc.

Telemetry unit for stationary applications

telemetry unit: stationary applications
telemetry unit: stationary applications

This telemetry unit is used to transmit measured data from a fixed 6-component WFT-Cx (for example, on a test stand) to an external connection unit.

Telemetry unit for rotating applications

Telemetry unit for rotating applications
Telemetry unit for rotating applications

This telemetry unit is used to transmit measured data from a rotating 6-component WFT-Cx to an external stator unit.

Carbon torque arm

The torque arm (stator holding device) is made from carbon and has three adjustable suction cups serving to lock the rotating telemetry unit.

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