SearchPublisher and Institutes
You are here: Home :: Area NEM :: Engineering :: Automation
Franz Fuchshumer, Wolfgang Kemmetmüller, Andreas Kugi
Nonlinear Control of Variable-displacement Self-supplied Axial Piston Pumps
Keywords: self-supplied axial piston pump, hydraulics, Nonlinear control, adaptive backstepping, switched systems
This contribution is concerned with the model-based nonlinear control of a variable-displacement, self-supplied axial piston pump for the application in plastic injection moulding machines. Due to the self-supply mechanism the mathematical model of the pump turns out to be a switched system depending on the direction of movement of the swash plate. The demands on the closed-loop performance with respect to dynamics and stationary accuracy on the assumption of unknown loads are basically derived from the injection process of plastic injection moulding machines. The control concept being derived consists of an inversion-based feedforward controller, an adaptive backstepping controller for the stabilization of the trajectory error system and an estimator for the unknown load. The controller and the estimator design are performed for each subsystem of the overall switched system separately. The stability of the overall closed-loop system can be proven in a systematic way by utilizing the theory of multiple Lyapunov functions. Experimental results on a test-stand show an excellent performance of the closed-loop system for all test scenarios.
at – Automatisierungstechnik, Oldenbourg Wissenschaftsverlag
Print ISSN: 0178-2312
Volume: 55, 02/2007
Pages: 58 - 68