Motion control of a hydraulic free-piston engine

Ke Li, Ali Sadighi, Zongxuan Sun

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

15 Scopus citations


Free-piston engine (FPE), as an alternative of the conventional internal combustion engine, has a high potential in terms of energy saving given its wide range of potential applications and high efficiency. One of the technical barriers that prevents the wide spread of this technology is the lack of precise piston motion control. This paper presents a novel strategy on the motion control of a hydraulic FPE. A robust repetitive controller is designed and implemented to form a virtual crankshaft that would provide a precise and stable engine operation. Based on the controller, a hardware-in-the-loop (HIL) environment that integrates the combustion chamber dynamics with the hydraulic system is developed to further validate the proposed control design. The experimental data of engine motoring tests with virtual crankshaft control demonstrates the effectiveness of the proposed approach.

Original languageEnglish (US)
Title of host publication2012 American Control Conference, ACC 2012
Number of pages6
StatePublished - Nov 26 2012
Event2012 American Control Conference, ACC 2012 - Montreal, QC, Canada
Duration: Jun 27 2012Jun 29 2012

Publication series

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


Other2012 American Control Conference, ACC 2012
CityMontreal, QC


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