Integrated Controls of Lateral Vehicle DynamicsSUMMARY A study is presented dealing with the synergism coming from the integration of such controlled systems which are designed for improving the dynamic khanour of road vehicles. A modified 114 car model is derived which allows suspension, toque and steering control to be applied to a low order vehicle model. A number of investigaiiong based either on complex vehicle models or on ground test$ show that impawt synergistic etTec4s can be c&ained from the integration of suspension, toque and steering controls. The .stmight nvlning on kegular raads may take advantage h m the cadperation of active suspension and four-wheel-steering systems. The brakmg under )I-split conditions can be improved with a pmper control of ABS and rear w h d steering. The driveability of a car entering a curve with c m surfaoe conditions could be substantially enhanced thanks to the combined exploitation of ABS and additional four wheel steering.

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Dipl.-Ing. Volker Alberti ist Fachreferent in der Fahrwerkentwicklung der Volkswagen AG. Arbeitsfeld: Fahrdynamik. Adresse: Volkswagen AG, Abteilung 1710 EFM, D-38436 Wolfsburg, Tel. (05361) 925384. Dipl.-Ing. Eckhard Babbel ist Fachreferent in der Forschung der Volkswagen AG. Arbeitsfeld: Fahrdynamik. Adresse: Volkswagen AG, Abteilung 1777 K-EFFA, D-38436 Wolfsburg, Tel. (05361) 922751. Dipl.-Ing. Stefan A. Drumm ist Entwicklungsingenieur in der Zukunftsentwicklung bei ITT Automotive Europe GmbH. Arbeitsfeld: Systemkonzeption, Simulation. Adresse: ITT Automotive Europe GmbH, Postfach 900120, D-60441 Frankfurt am Main, Tel. (069) 7603-3067. h Die Fahrsicherheit von Kraftfahrzeugen wird durch Erweiterung des Antiblockiersystems (ABS) zu einer Fahrstabilitätsregelung deutlich verbessert. Hierzu werden zusätzliche hydraulische Ventile und Sensoren zur Erfassung der Fahrdynamik benötigt. Die Regelung vergleicht den Fahrzustand mit dem Fahrerwunsch und korrigiert kritische Kursabweichungen durch dosiertes Anbremsen einzelner Räder. Der erreichte Sicherheitsgewinn wird durch Fahrversuche auf glatter Fahrbahn nachgewiesen. Driving stability control by active braking of the individual wheelsThe active driving safety of vehicles can be significantly improved by extending the anti-lock braking system (ABS) into a driving stability control system. For this purpose additional hydraulic valves and sensors to measure the vehicle dynamics are needed. The system compares the driving condition with driver input and corrects course deviations in critical situations. This is achieved through modulated braking of the individual wheels. The potential for improved active safety is demonstrated with the help of driving tests on slippery roads.