Flux observer for spool displacement sensing in self-sensing push-pull solenoids

Perry Y Li, Qinghui Yuan

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

3 Scopus citations

Abstract

Spool position feedback in an electrohydraulic valve typically requires a spool displacement sensing device such as a LVDT. Self-sensing is the methodology to obtain spool displacement information directly from the solenoid spool actuators, thus obviating the additional cost and footprint of a LVDT or another displacement sensing device. A self-sensing scheme that uses only the measurement of electrical signals to the pair of push-pull solenoids was first proposed in [1]. It uses the position dependence of electrical inductance in the solenoids to infer the spool displacement. The scheme in [1] relies on a flux observer and several infinite dimensional filters that require explicit resets, and is prone to singularity. The present paper proposes a modified scheme in which the flux observer (and hence the self-sensing) problem is cast in a linear time varying system setting so that standard linear observer design techniques can be brought to bear.

Original languageEnglish (US)
Title of host publicationProceedings of the 6th International Conference on Fluid Power Transmission and Control, ICFP 2005
EditorsYongxiang Lu, Qingfeng Wang, Li Wei
PublisherInernational Academic Publishers
Pages772-776
Number of pages5
ISBN (Electronic)7506274027, 9787506274029
StatePublished - Jan 1 2005
Event6th International Conference on Fluid Power Transmission and Control, ICFP 2005 - Hangzhou, China
Duration: Apr 5 2005Apr 8 2005

Publication series

NameProceedings of the 6th International Conference on Fluid Power Transmission and Control, ICFP 2005

Other

Other6th International Conference on Fluid Power Transmission and Control, ICFP 2005
CountryChina
CityHangzhou
Period4/5/054/8/05

Keywords

  • Electrohydraulic valves
  • Observer
  • Push-pull solenoids
  • Self-sensing
  • Spool displacement feedback

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