Passification of an electrohydraulic two-stage pressure control servo-valve

Kailash Krishnaswamy, Perry Y Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations


Passive systems have the beneficial property that their interconnections with other passive systems result in necessarily stable systems. This virtue of passive systems can be exploited with hydraulic systems to build powerful machines that are safe and human friendly. A difficulty in applying the passivity concept to electrohydraulic systems is that they are not intrinsically passive. In a previous paper, passification techniques were developed to render single-stage directional control valves as passive two-port devices with a supply rate related to the power input at the hydraulic port. In this paper, we extend the passification technique to two stage pressure control servo-valves. The passified two-stage valve avoids the flow rate and bandwidth limitations that exist for single-stage valves.

Original languageEnglish (US)
Title of host publicationProceedings of the American Control Conference
Number of pages6
StatePublished - Sep 6 2002
Event2002 American Control COnference - Anchorage, AK, United States
Duration: May 8 2002May 10 2002

Publication series

NameProceedings of the American Control Conference
ISSN (Print)0743-1619


Other2002 American Control COnference
Country/TerritoryUnited States
CityAnchorage, AK


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