Vehicle density and velocity estimation on highways for on-ramp metering control
| Autor: | Luis Alvarez-Icaza, Oscar A. Rosas-Jaimes |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Lyapunov function
Applied Mathematics Mechanical Engineering Aerospace Engineering Estimator Ocean Engineering Traffic flow Stability (probability) symbols.namesake Control and Systems Engineering Control theory Convergence (routing) symbols Convex combination Metering mode Electrical and Electronic Engineering Cell Transmission Model Mathematics |
| Zdroj: | Nonlinear Dynamics. 49:555-566 |
| ISSN: | 1573-269X 0924-090X |
| DOI: | 10.1007/s11071-006-9114-0 |
| Popis: | A scheme for vehicle density and velocity estimation in a stretch of highway based on a modified cell transmission model [C. F. Daganzo, Transportation Research, Part B, 28B(4),269–287, 1994. Elsevier is presented. The scheme is intended for use with on-ramp metering control algorithms, providing local knowledge of densities and velocities that is helpful to improve on-ramp metering control performance. Estimation of density is obtained by nonlinear estimators, while velocity estimation is obtained by gradient algorithms. There is one density–velocity estimator for free traffic flow and other for congested traffic flow. Both estimator schemes work in parallel. The final estimation of density and velocity results from a convex combination of the predictions of the two estimators. This combination depends on occupancy or density measurements at the boundaries of the stretch and is produced by a fuzzy inference system. Stability and convergence of the density and velocity estimation scheme is proved by Lyapunov based techniques. Simulation results comparing measured and estimated traffic data are presented. They confirm good performance of the estimators. |
| Databáze: | OpenAIRE |
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