Multivariable frequency domain analysis for automotive vehicle ride control

This paper describes the use of a decoupling technique to address automotive ride control. A full nonlinear vehicle model was developed, which was validated against experimental data. The resultant multivariable ride control problem was linearised, and then decoupled in the frequency domain using dyadic expansion. Diagonalisation was achieved for the range of primary ride frequencies. The resulting decoupled system consisted of three single input single output (SISO) systems, one for each of the sprung mass modes (bounce, pitch and roll). A velocity feedback controller was implemented for each sprung mass mode loop. This control strategy was then evaluated using a nonlinear simulation