Energy-saving control of an unstable valve with a MR brake

Oinghui Yuan, Perry Y. Li

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


In fluid power systems, excessive heat often causes solenoid failure. Heat, as well as useful power of a solenoid, is associated with the current. In this paper, we attempt to alleviate the requirement for the solenoid power, thus reducing the heat generation accordingly. The method we utilize to change the solenoid power requirement is based on unstable valves, which take advantage of fluid induced forces to achieve open loop instability. Previous studies have shown that for unstable valves, the electromagnetic actuator needs to absorb the power generated by the flow forces. Using the dual-solenoid actuator alone as a brake does not imply heat reduction. In this paper, we propose a new type of actuator in which a dual-solenoid actuator is mounted in series with a Magneto-Rheological(MR) brake. A nonlinear sliding mode optimal controller is then developed to achieve position tracking and energy-saving. Simulation verifies that using the proposed actuator and control law, heat generated in the unstable valves can be reduced significantly.

Original languageEnglish (US)
Article numberFrB12.4
Pages (from-to)4375-4380
Number of pages6
JournalProceedings of the American Control Conference
StatePublished - Sep 1 2005
Event2005 American Control Conference, ACC - Portland, OR, United States
Duration: Jun 8 2005Jun 10 2005


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