Integrated stability control of active aerodynamics and active rear-wheel steering for high-speed vehicle

At present, the research on improving vehicle handling stability, ride comfort, and driving safety mainly focuses on chassis system control, and rarely considers vehicle active aerodynamic control based on aerodynamic characteristics. Therefore, this paper takes the high-speed vehicle with adjustable tail as the research object, and the integrated stability control of active aerodynamics and active rear-wheel steering has been proposed. First, a linear two-degree-of-freedom (2-DOF) vehicle dynamic reference model was established, and the linear quadratic regulator (LQR) active rear-wheel steering controller was designed. Second, the principle of angle of attack distribution for active aerodynamic system was developed, an active aerodynamic Sliding Mode control (SMC) system was designed, which can automatically adjust the angle of attack of the rear wing, according to the vehicle status. Finally, the integrated stability control of active aerodynamics and active rear-wheel steering was realized. In the CarSim and Matlab/Simulink environment, the response characteristics of the integrated control to vehicle handling stability and safety were analyzed. The results show that the integrated stability control can effectively enhance the handling stability, ride comfort, safety, and road tracking ability of the high-speed vehicle, thus reducing the occurrence of vehicle runaway, rollover, and other dangerous situations.