Nonlinear adaptive control for injection molding machines

This paper presents a nonlinear adaptive control design technique for the injection ram velocity tracking control of a molding machine based on some physical assumptions. The backstepping design procedure is employed and the acceleration signal of injection ram is not needed in the controller design. In addition, all the system parameters except the cross-sectional area of the barrel are assumed to be unknown. Asymptotical stability of the overall closed-loop system is proved via Lyapunov method. Computer simulation is also given to demonstrate the validity of the proposed controller.