The first step toward a braking system "by wire" is Electro-Hydraulic Braking System (EHB). The paper describes a method to evaluate through virtual experimentation the actual improvement in vehicle behavior, from the point of view of both handling and comfort, including also pedal feeling. The first step consisted in modeling the hydraulic unit, comprehensive of sensors. Then was conceived a control logic devoted to medium-low intensity braking maneuvers, without ABS intervention, to determine an optimal braking force distribution and pedal feeling depending on the maneuver. A failsafe strategy, complete of on-board diagnosis, to prevent dangerous system behavior in the eventuality of a component failure was carried out and tested. Finally, EHB wheel pressure sensors were used to improve both ABS performance, increasing the adherence estimation, and Vehicle Dynamics Control (VDC) performance, through a more precise actuation. New ABS/VDC control strategies integrated with EHB were conceived and some of the main results obtained are presented.
Solution: Braking System
