Control of an antilock brake system for aircraft and land vehicles is based upon estimates of the torque applied to braking wheels by means of a sliding mode observer. The observer yields a highly accurate estimate of torque that is robust for the entire operating range of the brakes, and provides an input to a relatively simple control system that regulates applied torque from either an electro-hydraulic or electromechanical actuator. Excellent braking performance for a regional jet transport is demonstrated in this paper via hardware-in-the-loop simulation. In conclusion, it has been shown via simulation (including hardware-in-the-loop simulation) that an ABS based upon a sliding mode observer estimate of differential torque combined with a suitable limit cycle controller is technically feasible. The system requires only a measurement of braked wheel angular speed and requires no a priori knowledge of friction characteristics of the tire and runway/road. A simple compensating controller operating with a measurement of wheel fore-aft acceleration effectively suppresses gear walk yielding a highly effective ABS for aircraft. A similarly effective ABS for land vehicles is potentially available using the concept of the present method.
A sliding mode observer based ABS for aircraft and land vehicles
Antiblockiersystem für Luft- und Landfahrzeuge auf der Basis eines Gleitbeobachters
2003
8 Seiten, 13 Bilder, 5 Quellen
Conference paper
English
A Sliding Mode Observer Based ABS for Aircraft and Land Vehicles
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