Oil leakage analysis for an active anti-roll bar system of heavy vehicles

Vehicle rollover is an important road safety problem world-wide. Although rollovers are relatively rare events, they are usually deadly accidents when they occur. The roll stability loss is the main cause of rollover accidents in which heavy vehicles are involved. In order to improve the roll stability, most of modern heavy vehicles are equipped with passive anti-roll bars to reduce roll motion during cornering or riding on uneven roads. However, these may be not sufficient to overcome critical situations. The active anti-roll bar system is considered as the most common method in order to improve the roll stability of heavy vehicles. In this chapter, the authors are interested in the effects of the internal leakage inside the electronic servo-valve on the performance of the active anti-roll bar system of heavy vehicles. Hence, the main contents are summarized in the following points: The internal leakage inside the electronic servo-valve is analysed in detail and characterized by the total flow pressure coefficient. Thanks to this leakage, it is important that the active anti-roll bar system can act in a self-protection capacity when the controller fails. An H∞/LPV active anti-roll bar controller for the fully integrated model is synthesized by using the grid-based LPV approach. Here, the forward velocity is considered as the varying parameter to adapt to the different types of heavy vehicle movements. The simulation results indicate that the internal leakage inside the electronic servo-valve drastically affects the characteristics of the closed-loop system. The two main objectives (enhancing roll stability and avoiding the saturation of the actuators) are simultaneously satisfied when the total flow pressure coefficient KP is chosen in the interval. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2022.