Title: On-board estimation of dynamic tyre forces from optically measured tyre carcass deflections

Authors: Ari Tuononen

Addresses: Laboratory of Automotive Engineering, Helsinki University of Technology, P.O. Box 4300, FI-02015 TKK, Finland

Abstract: Active safety systems would benefit from accurate information on tyre forces. A special sensor module has been developed for research purposes to study real-time tyre force estimation from tyre carcass displacements. The forces can be measured in vertical, lateral and longitudinal directions. The sensor measures tyre carcass movement with respect to the rim and transmits the data wirelessly to the chassis. The raw data is analysed and tyre force information is available on a CAN-bus. The sensor is calibrated in a tyre test rig and proving ground measurement results are presented. The lateral and longitudinal force estimates are accurate when compared with the vehicle accelerations, but the vertical force is difficult to estimate during heavy braking manoeuvres.

Keywords: active safety systems; vehicle safety; intelligent tyres; optical tyre sensors; tyre deformation; friction estimation; advanced driver assistance; optical position detection; dynamic tyre forces; tyre carcass deflections; force estimation; wireless communications; CAN bus; vehicle acceleration; heavy braking.

DOI: 10.1504/IJHVS.2009.027139

International Journal of Heavy Vehicle Systems, 2009 Vol.16 No.3, pp.362 - 378

Published online: 15 Jul 2009 *

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