Full vehicle ABS braking using the SWIFT rigid ring tyre model
conference paper
In recent years, at the Delft University of Technology and TNO Automotive and in conjuction with an industrial consortium, a pragmatic tyre model has been developed going by the name SWIFT, which is geared to the analysis of tyre oscillations and its effects on vehicle behaviour. The SWIFt tyre model has been designed to cover in-plane, out-of-plane and combined higher order dynamic tyre performance. It can be regarded as an extension of the Magic Formula pragmatic tyre model, up to a range of at least 50 HZ. This paper describes the application of the SWIFT tyre model to full vehicle ABS braking. First, the model is used to derive the single tyre response to road undulations and brake torque step input, both being very much of relevance to ABS braking. This includes a survey of the sensitivity of the dynamic tyre parameters regarding the first, rigid belt, eigenfrequencies and the relative damping. Next, the response of a quater vehicle to similar input is discussed with specific emphasis on the added value of the dynamic characteristics of the SWIFt model in comparision to steady state and transient tyre models. Finally, full vehicle ABS controlled braking on an even road is considered for various road friction values and vehicle speed.
Topics
TNO Identifier
362312
Source title
Mechatronics 2000, First IFAC Conference on Mechatronic Systems, 18-20 September, Darmstad, Germany
Files
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