Identifying Tire Pressure Variation by Nonlinear Estimation of Longitudinal Stiffness and Effective Radius
- Delivery
- Available on this site
- Format
- Price
- Non-members (tax incl.)：￥1,100 Members (tax incl.)：￥880
- Publication code
- 20024628
- Paper/Info type
- AVEC
- Pages
- 899-906(Total 8 p)
- Date of publication
- Sep 2002
- Publisher
- Others, Unknown
- Language
- English
- Event
- AVEC '02
Detailed Information
| Category(E) | Tire II |
|---|---|
| Author(E) | 1) C.R.Carlson J.C.Gerdes |
| Abstract(J) | ニュートン第二法則及びエネルギ法に基づく線形方程式にて推定したタイヤ前後剛性と有効半径推定値は計測ノイズに過敏である事をシミュレーションにて証明した． これらを非線形領域まで拡張した理論を実車試験データに適用すると， タイヤ内圧と前後剛性には反比例の関係が存在し， タイヤ内圧はタイヤ特性検討時の重要な要因であると判明した． Translation |
| Abstract(E) | Previous work estimates longitudinal stiRness and wheel eRective radius using a linear least squares esti-mator and GPS as an absolute velocity sensor. This paper extends this work by reformulating the problem with an energy interpretation and demonstrates that both linear formulations are sensitive to small values of measurement noise with a simulation study. It then proposes two nonlinear estimation schemes which appear to be unbiased when subjected to observed levels of measurement noise in truth simulations. These nonlin-ear schemes are then applied to real test vehicle data and predict that as tire pressure decreases by ≫ 10%, longitudinal stiRness increases by ≫ 10%. This apparent sensitivity suggests that any force-slip analysis must carefully control tire pressure before any conclusions about tire properties can be made. It also suggests that a longitudinal stiRness estimate may be used to predict tire in°ation pressure. |
