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Effect of closed-loop controlled resonance based mechanism to start free piston engine generator: Simulation and test results

Lookup NU author(s): Dr Boru Jia, Dr Guohong Tian, Dr Andrew SmallboneORCiD, Professor Tony Roskilly


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Two general methods to start the engine are investigated by the linear electric machine operating as a linear motor and identified one for a specific FPEG prototype configuration. Based on that, a novel method to start the engine by mechanical resonance is proposed. Both simulation and test results are presented, and the numerical model is successfully validated. The results show that with a fixed motor force of 110 N, within 0.5 s, the maximum in-cylinder pressure could reach 13 bar, indicating that the engine is ready for ignition. Further investigation on the engine performance with the closed-loop control strategy is carried out. The results demonstrate that it is feasible to start the FPEG with mechanical resonance with a closed-loop controlled electric linear machine that applies a proper constant motor force in the direction of the natural bouncing motion. With different starting motor force, the top dead centre (TDC) value for both cylinder is different during the first few running cycles, but the difference reduces and tends to be zero during the stable resonance state. There is not any significant difference observed on the engine frequency and piston profile during combustion process.

Publication metadata

Author(s): Jia B, Zuo Z, Feng H, Tian G, Smallbone A, Roskilly AP

Publication type: Article

Publication status: Published

Journal: Applied Energy

Year: 2016

Volume: 164

Pages: 532-539

Print publication date: 15/02/2016

Online publication date: 24/12/2015

Acceptance date: 30/11/2015

ISSN (print): 0306-2619

ISSN (electronic): 1872-9118

Publisher: Pergamon Press


DOI: 10.1016/j.apenergy.2015.11.105


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Funder referenceFunder name
51006010National Nature Science Foundation of China
B12022Programme of Introducing Talents of Discipline to Universities of China