Digital image correlation techniques for measuring tyre-road interface parameters : Part 2 - Longitudinal tyre slip ratio measurement

摘要

Measurement of tyre longitudinal slip-ratio is often estimated from three independent measurements devices namely wheel rotationspeed, vehicle speed and tyre rolling radius. This produces an expensive measurement system to indirectly determine the slip-ratio. Thispaper presents a method by which the slip-ratio is determined from a video camera using digital image correlation techniques. Thecamera, mounted in such a way that the contact patch region is captured, enables the system to measure the tyre tread speed and groundspeed at the contact patch. The slip-ratio is then determined from these two measurements.