Fundamental performance limitations for a class of electronic two-stage proportional flow valves

E. Prasetiawan, R. Zhang, A. Alleyne

Research output: Contribution to journalConference articlepeer-review

17 Scopus citations


This paper examines the dynamics of a popular type of two-stage flow control valve currently seeing increased usage in electrohydraulic systems. This particular component has the trademarked name: 'Valvistor.' While several benefits do exist, there are limitations to the closed loop performance of the valve when it is included in a valve-controlled electrohydraulic system. An attractive feature of this two-stage valve is that the pilot flow can also contribute to the total flow giving higher steady state flow efficiency. However, for dynamic performance this structure results in zeros in the open loop transfer function, which will limit the closed loop bandwidth of a flow control system. This paper presents an analytical model of this particular type of valve and derives the presence of the inherit system zeros. A model simplification is also presented which clearly illustrates the performance-limiting zeros. In addition, identification results on a testbed are presented to give the model and the analysis the necessary experimental validation.

Original languageEnglish (US)
Pages (from-to)3955-3960
Number of pages6
JournalProceedings of the American Control Conference
StatePublished - 2001
Externally publishedYes
Event2001 American Control Conference - Arlington, VA, United States
Duration: Jun 25 2001Jun 27 2001


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