Open-loop controller

About: Open-loop controller is a research topic. Over the lifetime, 16148 publications have been published within this topic receiving 224014 citations. The topic is also known as: non-feedback controller & open-loop control law.

Integrated conveyor bed

Abstract: A conveyor system, and method of controlling the conveyor system, includes providing a conveying surface (58), at least one motor (52a) propelling the conveying surface and a plurality of lower-level controllers (106). At least one of the lower-level controllers adapted to control the at least one motor. An upper-level controller (108) is provided in communication with the plurality of lower-level controllers (106). The upper- level controller is adapted to send communications to the lower-level controllers for controlling the at least one motor (52a). A communication bus is provided that carries the communications between the upper-level controller and the lower-level controllers. The upper-level controller is adapted to automatically assign each lower-level controller a unique communication address. The unique communication address enables the upper-level controller to send messages over the communication bus (146) to individual ones of the lower-level controllers.

Anti-windup design with guaranteed regions of stability for discrete-time linear systems

Abstract: The purpose of this paper is to study the determination of stability regions for discrete-time linear systems with saturating controls through anti-windup schemes Considering that a linear dynamic output feedback has been designed to stabilize the linear discrete-time system (without saturation), a method is proposed for designing an anti-windup gain that maximizes an estimate of the basin of attraction of the closed-loop system in the presence of saturation It is shown that the closed-loop system obtained from the controller plus the anti-windup gain can be locally modelled by a linear system with a deadzone nonlinearity Then, based on the proposition of a new sector condition and quadratic Lyapunov functions, stability conditions in an LMI form are stated These conditions are then considered in a convex optimization problem in order to compute an anti-windup gain that maximizes an estimate of the basin of attraction of the closed-loop system Moreover, considering stable open-loop systems, it is shown that the conditions can be slightly modified in order to determine an anti-windup gain that ensures global stability

Robust Digital Tracking Controller Design for High-speed Positioning Systems

Abstract: In this paper, a design approach for robust digital tracking controllers for high-speed positioning is proposed. In high-speed tracking, the combination of a feedforward controller and a robust feedback controller is desirable: the robust feedback controller compensates for mechanical nonlinearities, parameter variation, and disturbances and lets the dynamic behavior of the actual feedback loop system stay close to the nominal one, which makes it possible for the feedforward controller to correctly anticipate and compensate for closed loop dynamics. The idea of disturbance observers is utilized to construct a robust feedback system, and is combined with the idea of zero phase error feedforward controllers. The overall system is demonstrated to possess excellent tracking performance by simulation and experiment.

A First Step Towards Adaptive Control for Linear Systemsin Max Algebra

Abstract: A linear system theory has been developed for discrete event systems subject to synchronization. We are interested in the just in time control of such systems in presence of a possible mismatch between the system and its model. Taking such mismatch into account in controller synthesis prevents us from using the usual open loop control structure. The approach we propose to synthesize the controller is inspired by the principle of the indirect adaptive control well known in conventional system theory. Its design leads to solve an optimal tracking problem under an equality constraint. Preliminary results about the estimation of models are presented.

Novel stepper motor controller based on FPGA hardware implementation

Abstract: This paper proposes a novel stepper motor controller based on field programable gate arrays, showing a remarkable performance. The system provides a combination between a novel algorithm and programmable logic to achieve both high speed and high precision on a compact hardware.