This paper presents a Unified Chassis Control (UCC) strategy to improve vehicle lateral stability and maneuverability. Direct Yaw Moment Control (DYC) and Dynamic Ride Control (DRC) are used for lateral and roll stability, respectively. The DYC based on a 2-D bicycle model is designed by sliding mode control considering tire cornering stiffness uncertainties. In the case of conventional Electronic Stability Control (ESC), the desired yaw moment is generated by differential braking. Unintended deceleration of the vehicle due to the differential braking for the yaw stability control is a negative effect of the conventional ESC. To solve this problem, an optimum integration of active front steering (AFS) and ESC is proposed. The integrated optimum control law is designed by Karush-Kuhn-Tucker (KKT) condition. A sliding control-based roll controller has been presented. For the improved performance of the lateral stability control system, the damping forces at the four corners have been controlled to minimize roll angle by the Continuous Damping Control (CDC)system. Signals such as steering wheel angle, wheel speeds, yaw rate, longitudinal velocity, longitudinal and lateral vehicle accelerations, unsprung mass vertical accelerations, body vertical accelerations, engine and turbine RPMs are available and already exist on vehicles equipped with an ESC and CDC. Roll angle and roll rate, tireroad friction and vertical load can be estimated using the estimators proposed by many previous researchers. Estimators (longitudinal/lateral tire forces) have been designed in this study.
Development of a unified chassis control system for vehicle stability and maneuverability
2008
6 Seiten, 8 Bilder, 9 Quellen
Aufsatz (Konferenz)
Englisch
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