Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test results
The operation process of free-piston engine generator (FPEG) can be divided into starting process and power generation process, and each of them faces severe challenges especially for the opposed-piston FPEG. As the first part of the investigation, this paper focuses the starting process of opposed...
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doaj-b3e5e810bfb5471dad83b3e2509333112021-08-14T04:31:07ZengElsevierEnergy Reports2352-48472021-11-01749774987Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test resultsLimin Wu0Huihua Feng1Ziwei Zhang2Zhifeng Tang3Boru Jia4Xiaodong Yan5School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaCorresponding author.; School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, ChinaThe operation process of free-piston engine generator (FPEG) can be divided into starting process and power generation process, and each of them faces severe challenges especially for the opposed-piston FPEG. As the first part of the investigation, this paper focuses the starting process of opposed piston FPEG. Two novel general methods to start the opposed-piston FPEG are investigated by the linear electric machine operating as linear motor. Both simulation and test results are presented, and the numerical model is successfully validated. The test results show that the maximum in-cylinder pressure of the engine cylinder is 11.85bar, indicating that the engine is ready for ignition, and the synchronization error of opposed-piston fluctuates within ± 2 mm with the limitation of the synchronization mechanism Further investigations on the opposed-piston scheme performance with the displacement master–slave control strategy and current master–slave control strategy are carried out. The results demonstrate that both control strategies are feasible to start the opposed-piston FPEG. More importantly, the current master–slave control strategy has faster response to external interference and therefore the piston synchronization error is smaller. And the smaller motor force of the current master–slave control strategy makes the peak in-cylinder pressure reach the target value. Further research shows that the mass of moving parts, constant motor force and the synchronization mechanism are crucial factors for such schematic prototype during starting process.http://www.sciencedirect.com/science/article/pii/S2352484721005977Opposed-piston free-piston engine generatorStarting processControl strategyPhysical modelingTest results |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Limin Wu Huihua Feng Ziwei Zhang Zhifeng Tang Boru Jia Xiaodong Yan |
spellingShingle |
Limin Wu Huihua Feng Ziwei Zhang Zhifeng Tang Boru Jia Xiaodong Yan Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test results Energy Reports Opposed-piston free-piston engine generator Starting process Control strategy Physical modeling Test results |
author_facet |
Limin Wu Huihua Feng Ziwei Zhang Zhifeng Tang Boru Jia Xiaodong Yan |
author_sort |
Limin Wu |
title |
Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test results |
title_short |
Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test results |
title_full |
Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test results |
title_fullStr |
Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test results |
title_full_unstemmed |
Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test results |
title_sort |
research on starting process and control strategy of opposed-piston free-piston engine generator _ simulation and test results |
publisher |
Elsevier |
series |
Energy Reports |
issn |
2352-4847 |
publishDate |
2021-11-01 |
description |
The operation process of free-piston engine generator (FPEG) can be divided into starting process and power generation process, and each of them faces severe challenges especially for the opposed-piston FPEG. As the first part of the investigation, this paper focuses the starting process of opposed piston FPEG. Two novel general methods to start the opposed-piston FPEG are investigated by the linear electric machine operating as linear motor. Both simulation and test results are presented, and the numerical model is successfully validated. The test results show that the maximum in-cylinder pressure of the engine cylinder is 11.85bar, indicating that the engine is ready for ignition, and the synchronization error of opposed-piston fluctuates within ± 2 mm with the limitation of the synchronization mechanism Further investigations on the opposed-piston scheme performance with the displacement master–slave control strategy and current master–slave control strategy are carried out. The results demonstrate that both control strategies are feasible to start the opposed-piston FPEG. More importantly, the current master–slave control strategy has faster response to external interference and therefore the piston synchronization error is smaller. And the smaller motor force of the current master–slave control strategy makes the peak in-cylinder pressure reach the target value. Further research shows that the mass of moving parts, constant motor force and the synchronization mechanism are crucial factors for such schematic prototype during starting process. |
topic |
Opposed-piston free-piston engine generator Starting process Control strategy Physical modeling Test results |
url |
http://www.sciencedirect.com/science/article/pii/S2352484721005977 |
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