Journal of Auto-vehicle Safety Association ISSN:2005-9396(Print) 자동차안전학회지

This study proposes an active body control system model that supplies the required hydraulic pressure only during active roll control to reduce the high energy consumption associated with conventional active suspension systems. To this end, a commercially available electro-hydraulic actuator was modeled, and a control algorithm was constructed by combining roll-angle estimation and rollover index calculations. Co-simulation results using CarSim and Simulink demonstrated that the vehicle equipped with the proposed active suspension system reduced the rollover index by more than 70% compared with the passive suspension system and maintained the roll angle within 5 degrees under emergency driving conditions, confirming its rollover prevention capability. Furthermore, the actuator requirement analysis showed that the maximum simulated cylinder pressure was 82.5 bar under the 0.5 g condition. This value was rounded upward to define a peak operating-pressure requirement of 85 bar, corresponding to a required operating load of approximately 664.6 kgf when a conservative nominal piston area of 7.9 cm² was used. A design pressure rating of at least 100 bar was recommended, providing a 17.6% pressure margin above the 85-bar operating requirement. These results provide design guidelines for the motor, actuator, and overall system configuration of future electro-hydraulic active suspension systems.