The trend of the development of modern locomotive traction control concepts contains a better use of the friction potential of the rail-wheel contact. Titis contribution defines the idea of an observer-based traction control concept. Core of the concept is the Proportional-Integral (PI) observer. Task of this linear observer scheme is the estimation of the unknown contact force of the rail-wheel contact. The contact force highly depends on the kinematical contact situation and additionally on external physical effects like rain or temperature. By observing the contact situation by the PI-Observer the actual adhesion characteristic between rail and wheel can be determined. The complex inside into the dynamical micromechanic contact gives the base for advanced traction control concepts. To get online-estimations of the contact force in this problem field, there should not be made any assumptions about the geometry of contact. The proposed observer scheme solves the task due to its design concept. Simulations of the driven wheel contact show the efficiency of this approach. Therefore a special maneuver for the driven torque ist used to simulate the dynamical contact. Using stochastical disturbed friction-slip relations the physical effects are modelled. As a result it is possible to say that observer-based measurements of the nonlinear rail-wheel contact force are realizable.
Observer-based measurement of contact forces of the nonlinear rail-wheel contact as a base for advanced traction control
Beobachterbasierte Messung der Kontaktkräfte bei nichtlinearem Gleis-Rad-Kontakt als Grundlage für fortschrittliche Zugkraftregelung
1999
15 Seiten, 6 Bilder, 26 Quellen
Aufsatz (Konferenz)
Englisch
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