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research-article

Discrete Linear Time Invariant Analysis of Digital Fluid Power Pump Flow Control

[+] Author and Article Information
Per Johansen

Fluid Power and Mechatronic Systems Department of Energy Technology Aalborg University, Denmark
pjo@et.aau.dk

Daniel Beck Roemer

Postdoctoral Researcher Fluid Power and Mechatronic Systems Department of Energy Technology Aalborg University, Denmark
dbr@et.aau.dk

Torben O. Andersen

Fluid Power and Mechatronic Systems Department of Energy Technology Aalborg University, Denmark
toa@et.aau.dk

Henrik C. Pedersen

Fluid Power and Mechatronic Systems Department of Energy Technology Aalborg University, Denmark
hcp@et.aau.dk

1Corresponding author.

ASME doi:10.1115/1.4036554 History: Received January 04, 2016; Revised March 30, 2017

Abstract

A fundamental part of a digital fluid power (DFP) pump is the actively controlled valves, whereby successful application of these pumps entail a need for control methods. The focus of the current paper is on a flow control method for a digital fluid power pump. The method separates the control task concerning timing of the valve activation and the task concerning the overall flow output control. This enables application of linear control theory in the design process of the DFP pump flow controller. The linearization method is presented in a general framework and an application with a DFP pump model exemplify the use of the method. The implementation of a discrete time linear controller and comparisons between the nonlinear model and the discrete time linear approximation shows the applicability of the control method.

Copyright (c) 2017 by ASME
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