15th Triennial World Congress of the International Federation of Automatic Control
  Barcelona, 21–26 July 2002 
ESTIMATION OF VEHICLE VELOCITY USING BRAKE-BY-WIRE ACTUATORS
S. Semmler, D. Fischer, R. Isermann, R. Schwarz, P. Rieth
Institute of Automatic Control
Laboratory of Control Systems and Process Automation
Darmstadt University of Techology
Landgraf-Georg-Str. 4, D-64283 Darmstadt - Germany
Phone: +49-6151-16-7404, Fax: +49-6151-16-7421
E-Mail: SSemmler@iat.tu-darmstadt.de
Continental Teves AG & Co. oHG
Guerickestr. 7, D-60488 Frankfurt am Main - Germany

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.
Keywords: antilock braking systems, brakes, fuzzy systems, vehicle, velocity measurements
Session slot T-Fr-M12: Vehicle Dynamics and Control/Area code 8b : Automotive Control