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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. A simple scheme for suppressing gear walk (aircraft application) is presented.

This paper presents a method of trailer yaw stabilization for a tractor-trailer by automatic differential braking of trailer rear wheels. It is implemented as part of an ABS based upon a sliding mode observer (SMO). The trailer rear wheel brakes are alternately applied according to a control law derived from measurements of trailer yaw (relative to the tractor axis). The SMO provides an additional control function that prevents wheel lock. Brakes are applied in response to a control signal that is generated from measurements of trailer yaw. The SMO-based ABS regulates braking to prevent wheel lock and to simultaneously optimize yaw control.