To improve the performance of semi-active suspension,the paper proposes an IPSO-BP algorithm as an adaptive semi-active suspension control algorithm.The IPSO algorithm improves the standard PSO algorithm to perfect the convergence rate and the capability of global convergence and is used for the BP neural network learning algorithm for adaptive semi-active suspension control.Adaptive controller has a two-unit structure neural network.One is an input controller,which adjusts the value of semi-active suspensi...