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In practice, high quality control for mechatronic systems is often achieved by augmenting classical control architectures like PID controllers with numerous tailored nonlinear characteristic parameter curves and cascades. This complexity can be significantly reduced by utilizing advanced model predictive controllers (MPC). Furthermore, desired objectives like minimum control error and effort can be...
In this contribution the control of a hydraulic pressure relief valve is discussed. Due to strong nonlinearities of the valve and the influence of a varying oil flow advanced control strategies are mandatory if advanced closed-loop performance is demanded. On the one hand, classical PI-like control structures can be applied to achieve the desired closed-loop performance. However, for this the controller...
This publication discusses the topic of sliding mode control and its practical application to position control of a hydraulic directional valve. The main issue relies on the design of an adaptive sliding function, to achieve optimal closed loop performance. For this, a Lyapunov-based stability proof for a second order sliding mode controller is presented. To obtain adaption functionality, it is extended...
This paper discusses the problem of position control of a directional valve in absence of a plant model. Due to strong nonlinearities of the system, advanced control strategies are mandatory if ideal closed-loop performance is recommended. Oftentimes, strategies based on complex PID-control structures using nonlinear gains for different controller branches, containing many highly correlated parameters...
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