Advanced driver assistance systems would benefit from accurate information on tyre operating states. An optical tyre sensor was developed in the EC project APOLLO, and it has been further developed in the FRICTI@N project. Many steps forward have been taken and the optical tyre sensor can at the moment deliver tyre forces for the CAN bus in real time. Real-time capable algorithms are presented, which are tested on several cars and a truck. The tyre sensor signal waveforms are compared to the FEM simulations and force estimations are compared to the test rig measurements. Some results concerning optical tyre sensor behaviour in aquaplaning are also presented. The optical tyre sensor can very accurately estimate tyre forces if the tyre inflation pressure is known. In the previous results the inflation pressure was always the same as during calibration measurement in the test rig. The inflation pressure increases enough in normal driving to introduce a bias to the tyre force estimate. However, if there is ever a tyre force sensor based on carcass movements in production, the direct TPMS will certainly be standard equipment at that time. The longitudinal movement signal has been found to carry most of the information. It reveals the contact length and the longitudinal forces. Vertical movement signal (intensity) is disturbed by LED alignment, temperature etc. The lateral tyre force can be accurately estimated from the lateral movement signal. It makes it possible to estimate the vehicle slip angle accurately and rapidly, because the tyre force is acting on the chassis in advance before accelerations and rotational velocities are generated.
Tyre sensing approach for friction estimation in FRICTI@N project
Reifensensorik zur Reibwertschätzung
2008
11 Seiten, 11 Bilder, 10 Quellen
Conference paper
Storage medium
English
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