Coordinated control of a semi-active suspension system and an electronic stability program on a finite-state basis

Abstract

Considering the different effective working areas corresponding to respective functions of semi-active suspension systems (SASS) and electronic stability program (ESP) subsystems, the coordinated control of SASS and ESP based on the basis of finite-state is proposed to enhance the vehicle comprehensive performance. On the basis of the parallel connection between the SASS and ESP, an upper coordination controller on the finite-state basis is then combined in series with the SASS and ESP systems. The upper coordination controller identifies the vehicle's main driving conditions and make the strategy amendments to the bottom automotive semi-active suspension and electronic stability program. A SASS with PID control is presented along with an ESP with logic threshold control containing a variable slip rate and direct yaw moment control (DYC). Simulation results demonstrate that the coordinated control of the SASS and ESP on a finite-state basis can effectively improve the vehicle ride comfort and handling stability under multiple conditions.