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- Products -> Wheel force transducer (WFT) for Passenger Cars
The measuring wheel system ROLS4w has been designed to acquire operating loads as well as to carry out vehicle dynamics tests on passenger cars. It was developed especially under the aspect of easy mounting and handling. A key component here is our innovative stator which is on the inner side of the wheel and particulary easy to install. An optimized version of our proven ROLSmc wheel electronics is used for data acquisition. Due to the co-rotating wheel electronics no external calculation unit is needed for signal acquisition, calibration and transformation. All control functions (angular offset, configuration, etc.) as well as the data output are conducted via the CAN-FD interface.
In addition to the wheel forces and moments, the specially developed twoaxis accelerometer in the wheel center acquires the x- and z-accelerations.
All wheel loads are detected in a one-piece measuring element ring consisting of 5 strain gauge-based three component measuring points. Each measuring point is calibrated individually and separately. The complete force flow is introduced from tire and rim ring, via the sensor ring to the wheel hub. Wheel electronics and the innovative stator are located inside the wheel hub.
The 15 bridge signals from the strain gauge measuring points are each amplified and digitally processed individually by the co-rotating electronics with an integrated high performance DSP. In this procedure wheel forces and wheel moments are calculated, by means of calibration information and wheel geometry. Via FPGA-based, capacitive, rotational angle detection, the measured values are transformed into the non-rotating coordinate system. Output of the computed data with 16/24/32 bit resolution takes place via a CAN-FD interface.