This report evaluates the optimization of tire workload using the minimax criterion for a range of vehicles, including conventional front-wheel steering vehicles, four-wheel steering vehicles, front-wheel independent steering vehicles and four-wheel independent steering vehicles. In optimizing the conventional steering system precisely using minimax criterion, algebraic solutions can be found for the literally optimized distribution using estimated values for vertical load and lateral forces and the reference values for total traction/breaking force and direct yaw moment. Since this basic solution works at the lower level, i.e., in the distribution of traction/breaking force, this is applicable to any isometric steering system including frontwheel active steering and four-wheel active steering vehicles. Front-wheel independent steering means vehicles whose front wheels steering actions are independently controlled. In optimization of the tire workload, the distribution of tire forces is optimized between the left and right front wheels using control conditions of the front axle lateral forces. In addition to the traction/braking forces on all wheels, the steering angles of the front two wheels are variables. A combination of the binary search method and the above algebraic solutions realizes efficient optimization and results in considerable drivability improvements. In the case of four-wheel independent steering, additional variables of rear wheel steering angles are included, and the equality constraint of lateral force acting on the rear axle is imposed to the problem, but the robust golden section search method can be used as an exterior loop for the binary search. The convergence of these algorithms is guaranteed by the convexity of each objective function that defines the distribution problem, and most of them can be implemented for practical real time optimizations.
Exact minimax optimization of tire workload for independent steering vehicles
Genaue Minimax-Optimierung der Reifenauslastung für Allradantriebsfahrzeuge
2006
6 Seiten, 2 Bilder, 7 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Exact Minimax Optimizations of Tire Workload for Independent Steering Vehicles
British Library Conference Proceedings | 2006
|British Library Conference Proceedings | 2006
|British Library Conference Proceedings | 2006
|PI Front Steering and PI Rear Steering Control with Tire Workload Analysis
British Library Conference Proceedings | 2007
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