Development of Free Piston Engine Linear Generator System Part 1 - Investigation of Fundamental Characteristics

Kosaka, Hirofumi; Akita, Tomoyuki; Moriya, Kyoji; Goto, Shigeaki; Hotta, Yoshihiro; Umeno, Takatoshi; Nakakita, Kiyomi

doi:10.4271/2014-01-1203

Cited by 145 publications

(93 citation statements)

References 16 publications

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“…The first one is trajectory tracking control, which means the piston motion is controlled to follow along with a specified reference trajectory [12][13][14][15][16][17]. The second one is specifying a reference current profile to generate an appropriate electromagnetic force for stable operation [5,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…In order to avoid collisions between the piston and the cylinder head, a motion control was presented through giving a desired trajectory that was very similar to the sinusoidal signal. Kosaka and Moriya also presented a trajectory tracking control to operate the piston motion [12,16]. However, in their studies, an inappropriate reference trajectory could have a negative effect on the output power and the system efficiency [13].…”

Section: Introductionmentioning

confidence: 99%

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A Free-Piston Linear Generator Control Strategy for Improving Output Power

Zhang

Chen

et al. 2018

Energies

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This paper presents a control strategy to improve the output power for a single-cylinder two-stroke free-piston linear generator (FPLG). The comprehensive simulation model of this FPLG is established and the operation principle is introduced. The factors that affect the output power are analyzed theoretically. The characteristics of the piston motion are studied. Considering the different features of the piston motion respectively in acceleration and deceleration phases, a ladder-like electromagnetic force control strategy is proposed. According to the status of the linear electric machine, the reference profile of the electromagnetic force is divided into four ladder-like stages during one motion cycle. The piston motions, especially the dead center errors, are controlled by regulating the profile of the electromagnetic force. The feasibility and advantage of the proposed control strategy are verified through comparison analyses with two conventional control strategies via MatLab/Simulink. The results state that the proposed control strategy can improve the output power by around 7-10% with the same fuel cycle mass.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Free-Piston Linear Generator Control Strategy for Improving Output Power

Zhang

Chen

et al. 2018

Energies

View full text Add to dashboard Cite

show abstract

“…The configurations of the FPLG prototypes can be generally classified into single-cylinder, dual-piston and the opposed-piston types [4], which have been widely studied by many groups worldwide [6][7][8][9][10][11][12][13]. The development status of these prototypes indicates that the single-cylinder FPLG has advantages of a simple structure and easy system control, and thereby is intensively studied [14,15].…”

Section: Introductionmentioning

confidence: 99%

Hybrid System Modeling and Full Cycle Operation Analysis of a Two-Stroke Free-Piston Linear Generator

et al. 2017

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Free-piston linear generators (FPLGs) have attractive application prospects for hybrid electric vehicles (HEVs) owing to their high-efficiency, low-emissions and multi-fuel flexibility. In order to achieve long-term stable operation, the hybrid system design and full-cycle operation strategy are essential factors that should be considered. A 25 kW FPLG consisting of an internal combustion engine (ICE), a linear electric machine (LEM) and a gas spring (GS) is designed. To improve the power density and generating efficiency, the LEM is assembled with two modular flat-type double-sided PM LEM units, which sandwich a common moving-magnet plate supported by a middle keel beam and bilateral slide guide rails to enhance the stiffness of the moving plate. For the convenience of operation processes analysis, the coupling hybrid system is modeled mathematically and a full cycle simulation model is established. Top-level systemic control strategies including the starting, stable operating, fault recovering and stopping strategies are analyzed and discussed. The analysis results validate that the system can run stably and robustly with the proposed full cycle operation strategy. The effective electric output power can reach 26.36 kW with an overall system efficiency of 36.32%.

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“…Furthermore, an FPEG system freely changes the stroke and compression ratio. Therefore, the thermal efficiency rises when compare with a conventional engine (5) . As mentioned above, an FPEG system is expected to exhibit higher efficiency when a) Correspondence to: Yuichiro Yamanaka.…”

Section: Introductionmentioning

confidence: 99%

Design of a Linear Synchronous Generator and Examination of the Driving Range for a Free-Piston Engine Linear Generator System

et al. 2018

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A free-piston engine linear generator (FPEG) system is a linear generator, which generates electricity when a free piston reciprocates the combustion thrust produced by internal combustion. It is expected that this system can be applied to hybrid vehicles. In an FPEG system, the high combustion energy is instantly added to a free piston. Nevertheless, it is difficult for a linear synchronous generator (LSG) to convert combustion energy into electric energy by using the output of the LSG given the limit of the inverter capacity. Hence, it is necessary for an LSG to convert combustion energy into electric energy while distributing the combustion energy in one stroke. Moreover, if an LSG is driven at high velocity and high thrust within the limit of an inverter capacity, then the LSG converts the high combustion energy into electric energy. In this study, we propose a configuration of an LSG with a typical output of 10 kW and a generation efficiency of 97% for an FPEG, and we evaluate its static thrust and magnetic flux density distribution using finite element method (FEM) analysis. Moreover, we examine the driving range of the LSG for an FPEG system.

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Development of Free Piston Engine Linear Generator System Part 1 - Investigation of Fundamental Characteristics

Cited by 145 publications

References 16 publications

A Free-Piston Linear Generator Control Strategy for Improving Output Power

A Free-Piston Linear Generator Control Strategy for Improving Output Power

Hybrid System Modeling and Full Cycle Operation Analysis of a Two-Stroke Free-Piston Linear Generator

Design of a Linear Synchronous Generator and Examination of the Driving Range for a Free-Piston Engine Linear Generator System

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