Rotating Wheel Dynamometer RWD

Measure Wheel Forces on a Passenger Car in the Morning and on a Light Truck in the Afternoon with a single RWD.

The lightweight Rotating Wheel Dynamometer (RWD) features quick installation, extremely wide frequency response and robust design. This allows the RWD to measure accurately on all road surfaces, test stands and vehicle types through light truck. Both automobile and tyre designers appreciate this powerful tool for collecting reliable road data/profiling in an efficient and time-saving manner.

The sensor system installs in place of a standard rim to measure forces acting between the road and the vehicle. It is an essential high-performance tool to optimise tyres, suspensions and vehicle dynamic control systems under actual rood conditions.

The use of piezoelectric quartz force sensors and integrated built-in electronics make the system rugged, easy to use and gives the highest possible measuring performance. Adapters for different hubs and rims make the unit very flexible for a wide variety of applicafions and measurement needs.

Additional measurement data can be gathered with the opfional Corrsys slip angle sensor. This combinafion allows the measurement of tyre slip angle combined with tyre forces (Fx, Fy, Fz) and torques (Mx, My, Mz).

Key Features
Two in one: Combined passenger car and up to light truck wheel force sensor

Fast and easy installation on the vehicle (get data within half an hour)

Best performance at lowest weight

Two ranges and zoom capabilities for maximum signal resolution

Patented triple flange design for optimal temperature compensation

±5 volts output for all 6-components

lP65 seal allows use in any weather conditions

Integrated real time coordinate transformation

Highest available frequency response (fnRWD> 1500Hz)

(The Rotating Wheel Dynamometer combined with the Corrsys slip angle sensor provides additional information about the wheel-road interaction.)

Rotating Wheel Torquemeter (RWT)

The RWT was specified and designed in close cooperation with end-users. From their suggestions and using the full advantages of quartz measurement techniques, KISTLER introduces a cutting edge product - the Rotating Wheel Torquemeter.

It is a universal sensor system, easy to use, with less than 15 minutes setup time. Obtaining reliable data within 15 minutes was one of Kistler's major goals.

All sensor specific data is downloaded and the system automatically resets for continued testing without any additional user interaction.

Signal output is available through analog channels, CAN-bus or RS-232C interface. Users can connect one of these interfaces to any standard data acquisition system.

Even at the lowest torque loads KISTLER guarantees highest resolution without compromising test driver safety. The driver can fully concentrate on his lob and drive the test vehicle as a customer would without the fear of overloaded torque sensors and broken wheels.

In addition to the torque signal, the sensor offers (on the rotating side) four inputs for K-type thermocouples (isolated or non-isolated). Signal conditioning and amplifiers are integrated in the RWT. Temperature data is also transmitted wireless to the control unit. Again this feature saves setup time, additional weight (unsprung mass) and costs. It also produces excellent signal quality.

Key features

Two independent measurement ranges

Setup in less than 15 minutes

Universal use - an investment for nearly unlimited applications

Automatic sensor identification and transmission of sensor specific data - best possible protection against improper configuration

Easy to install and easy to adapt on new vehicles - maximum return on investment

Measures lowest loads at highest resolution - no more safety risk for the test driver

Four integrated temperature channels - no additional design, no additional installations, no additional costs, minimal weight

Optimised additional unsprung mass - approximately 2.5 kg

It is possible to mount a slip-ring transmission module and fixation arm, instead of the transceiver head. This solution includes a digital angle encoder for applications where angular information is required.

Technical Data

Torque Channel ...... One

Measuring Range l ...... ±3000 Nm

Measuring Range II ...... ±300 Nm

Resolufion Range I-Il ...... 1.5 Nm

Add. unsprung mass ...... 2.5 kg

Sampling rate ...... 1000 samples/s

Temperature channels ...... 4 x K-type (isolated or non-isolated)

Output interfaces ...... CAN, RS-232C

Optional output ...... ±5 V analogue

Environmental seal ...... IP65

Operating temperature - Electronics ...... -25 to +80 °C Elements ...... -35 to +125 °C

Supply voltage CU ...... 9 to 16 VDC

The modular system consists of three main components:

The torque sensor, the transceiver head for telemetric signal transmission and the control unit located in the vehicle.


The Rotating Wheel Torquemeter is used for Vehicle Development Testing in the areas of...

Control systems for vehicle dynamics

ABS anti-lock braking and other braking effort distribution systems

Investigations of brake fade

Brake judder

Residual brake torque

Power transmission measurements

Determination of friction values

Coast down tests

Government safety tests (FMVSS 135)

These applications and more con be covered by the Kistler RWT sensor system with its unique ability to cover all ranges of torque in one unit.

(This extract is taken from the Kistler 'Vehicle Engineering News' - Oct 2000)

For more information, contact...

Kistler Instrumente AG Winterthur, Switzerland (Parent Company)
Email: Website:

Kistler Instruments Ltd. - UK
Email: Website:

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