Abstract: As the trends of electrification, connectivity, sharing, and intelligence in automobiles require X-by-wire chassis to become more intelligent and agile, the active camber and toe suspension system(ACTS) enhances vehicle maneuverability and stability through active wheel alignment adjustments. Current controllable suspension systems often use serial design approaches, where mechanical and control designs proceed step-by-step, making it difficult to obtain the global optimal solution of the system and fully exploit the potential of suspension mechanics and control. In this case, a system-level co-design optimization method is proposed for ACTS(SCOD-ACTS) to obtain a comprehensive optimal solution of mechanics and control for coordinated operation of multiple actuators in ACTS. During the design phase, the SCOD-ACTS parallelly and collaboratively optimizes the mechanical and control subsystems of ACTS, solving electromechanical system compatibility problems and improving ACTS vehicle dynamics performance; In the mechanical subsystem, a multivariate regression model characterizing the variable kinematics of both camber and toe is established, enabling comprehensive optimization of actuator displacements and kinematic characteristics to resolve multi-actuator coordination challenges; In the control subsystem, phase-plane vehicle state monitoring and active camber-toe coordination controllers are developed, with vehicle phase-plane self-stability boundaries and controller parameters being optimized to determine intervention timing and actuation strategies.. Simulation results show that under double-lane-change conditions at 108 km/h with road adhesion coefficient 0.85, the proposed SCOD-ACTS reduces peak yaw rate by 37.3% and peak sideslip angle by 49.3%, improving vehicle handling stability under extreme operating conditions.

Key words: active camber, active toe, system design, co-design optimization, coordinated control