Passivity based nonlinear suspension active control

By taking the nonlinear stiffness characteristics of spring into consideration, a novel suspension active control algorithm is presented in this paper for a kind of suspension systems described by quarter vehicle model. On the basis of Interconnection and Damping Assignment Passivity-based Control theory, active suspension nonlinear controller is obtained and the partial differential equations has solution, for the sake of analyzing the characteristics of the suspension system and selecting appropriate desired interconnection matrix, damping matrix and energy function. The controller can be simplified by choosing suitable form of design parameters, and the number of design parameters which are required to be set, are reduced as a result. The simulations of hitting large bump and on E-level ground illustrate that the proposed active controller has good performance.