Hybrid control strategies in ABS

Abstract

The ABS control problem is described, with a discussion on relevant h ybrid control aspects. Next, we comment o n conventional ABS design methods and present some new ideas and results on model-based ABS control design that relies on elements of hybrid control.

Wheel slip control in ABS brakes using gain scheduled constrained LQR

“…The contribution of the present work is a study of a model-based design of ABS controllers, see also [2], [3]. We consider electromechanical actuators [4] rather than hydraulic actuators, which allow continuous adjustment of the clamping force.…”

Synthesis of a Model-Based Tire Slip Controller

“…This might imply different reference values for the slip of each wheel. In [Johansen et al, 2001] there are presented two model based, hybrid approaches. These controllers have been tested on the same vehicle as the one used in this thesis.…”

“…The other approach presented in [Johansen et al, 2001] is a constrained LQ controller. In order to make it applicable for such fast processes, it does not rely on real-time optimization, but it evaluates the explicit solution to a suboptimal LQ problem.…”

“…In these tests the HPI controller had the best deceleration in comparison to the approaches in [Johansen et al, 2001]. The braking distance for the HPI controller, from an initial velocity of 30 m/s was between 36 − 41 meters, outperforming in this sense the controllers in [Johansen et al, 2001] and the production ABS.…”

“…The braking distance for the HPI controller, from an initial velocity of 30 m/s was between 36 − 41 meters, outperforming in this sense the controllers in [Johansen et al, 2001] and the production ABS.…”