Sascha Semmler

Estimation of vehicle velocity using brake-by-wire actuators

Abstract This paper describes an approach of how to estimate the vehicle velocity using additional sensors provided by the brake-by-wire actuators. The advantage of brake-by-wire actuators - such as the electro-hydraulic (EHB) and the electro-mechanical brake (EMB) - is that the caliper pressure or the clamping force, respectively, are known. Wheel speed, vehicle acceleration, and caliper pressure or clamping force, respectively, are used to estimate the vehicle velocity using a fuzzy approach. Besides, the mass of the vehicle and the slope of the road are derived from the sensors provided. Finally, it will be shown by measurement results that the velocity of a research vehicle equipped with brake-by-wire actuators and a new ABS approach can be estimated very precisely even at very high wheel slips and different road conditions.

Simulation based development within Global Chassis Control

Global Chassis Control (GCC) from Continental Teves is a logical enlargement of the current Electronic Stability Control (ESC). GCC aims to ensure the best possible levels of active safety, ride quality and driving pleasure under the given driving conditions, using the available configuration of electronically controlled chassis subsystems. Due to the complexity of interaction between these chassis components, vehicle simulation was used for development and evaluation of the advanced control algorithms. Simulation also allows analysis of the potential of each chassis actuator in stability critical driving situations, e.g. front or rear wheel steering intervention by braking on split-μ or during double lane change maneuvers.