GT Car's CG Height Control on a Rough Road by using Series Active Variable Geometry Suspension

This paper addresses the vehicle's CG (center of gravity) height control enhancement for the new road vehicle Series Active Variable Geometry Suspension (SAVGS) concept using the PID control technique. Thus, the study utilizes a nonlinear full-car model that represents accurately the dynamics and geometry of a high-performance car with the new double-wishbone active suspension concept. The proposed controller is installed on the nonlinear full-car model, and its performance is examined by the parameters, CG Height and Pitch. In this study, PID is tuned by a Genetic Algorithm and thus a robust control system is designed. Finally, the system's robustness is examined through four different simulation configurations such as different speeds and different road conditions. The vehicle is supposed to be moving with 20 km/h and 100 km/h horizontal speed and also it is going through Road Classes types C and D. Figures show that this suspension system successfully controls vehicle CG height around a desirable height (0.5m) and does not make harmful impacts on vehicle pitch angle.