The control theory about the control system of the metal pushing belt CVT is introduced
the basic composed elements are analysed
the mathematical model of the system is established
apply the robust theory based on the Riccati state-feedback equation to the electro-hydraulic control system of the metal pushing belt CVT controlled by ratio valve
the robust controller is designed and the simulation is analysed. The result indicates that the system stability and control precision can be improved
the control system has a much stronger anti ?jamming ability and tracking performance by robust control
the control system behaves a much stronger robustness