Experimental Evaluation of a Prototype Free Piston Engine - Linear Alternator (FPLA) System

Johnson, Terry A.; Leick, Michael T.; Moses, R.W.

doi:10.4271/2016-01-0677

Cited by 40 publications

(20 citation statements)

References 18 publications

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“…They also concluded that the opposed-piston architecture enables uniflow scavenging without the need for a valvetrain. 25,26 Dual-piston FPE. The dual-piston FPE architecture is based on a single piston with two crowns oscillating between two opposite combustion chambers.…”

Section: The Architecture Of Fpesmentioning

confidence: 99%

“…They concluded that system efficiency could be optimized and power output could be increased if the system is operated at the nominal frequency of the alternator. 25,26 Goldsborough et al combined 1D modeling with detailed chemical kinetics to simulate the HCCI combustion process of an FPLA fueled by natural gas and gasoline. They showed the necessity to control inlet temperature and pressure such that CA50 was set around TDC and peak pressures were acceptable.…”

Section: Ltcmentioning

confidence: 99%

“…They also concluded that the opposed-piston architecture enables uniflow scavenging without the need for a valvetrain. 25,26…”

Section: Introductionmentioning

confidence: 99%

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Advanced combustion free-piston engines: A comprehensive review

Zhou

Sofianopoulos

Lawler

et al. 2018

International Journal of Engine Research

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A reciprocating engine without a crank-slider mechanism is called a free-piston engine. If the piston is directly connected to a linear alternator, it is called a free-piston linear alternator. Free-piston engines and free-piston linear alternators have the potential to offer solutions for future hybrid electric vehicles and stationary power generation, by enabling direct conversion of mechanical energy to electricity. They benefit from reduced friction losses compared to conventional engines and can have variable compression ratio, which enables combustion control and optimization. Their widespread application has been limited by the necessity for high-speed control strategies. However, their operating characteristics can provide high efficiency, especially when used with low temperature combustion strategies. Low temperature combustion combines the high thermal efficiency of diesel engines, with the low soot emissions of spark-ignition engines, and low NO x emissions because of low burned gas temperatures. This article provides a comprehensive review of free-piston engine technology, with a focus on advanced combustion processes and their potential for use in future powertrain systems.

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Section: The Architecture Of Fpesmentioning

confidence: 99%

Section: Ltcmentioning

confidence: 99%

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Advanced combustion free-piston engines: A comprehensive review

Zhou

Sofianopoulos

Lawler

et al. 2018

International Journal of Engine Research

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“…Sandia National Laboratory has designed an opposedpiston FPEG [7]. The prototype is mainly composed of a central combustion chamber, two LEMs and two air springs, and operates in one-way scavenging two-stroke mode.…”

Section: Introductionmentioning

confidence: 99%

Compression Ratio Control of an Opposed-Piston Free-Piston Engine Generator Based on Artificial Neural Networks

Liu

2020

IEEE Access

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Opposed-piston free-piston engine generator (FPEG), as an energy conversion device, has attracted the attention of researchers with its advantages of variable compression ratio (CR) and good dynamic balance performance. At the same time, the variable compression ratio poses a challenge to the stable operation of the engine. The controller needs to overcome the interference caused by the combustion variations to the piston movement, so that the compression ratio of the engine remains stable. This paper proposes an opposed-piston synchronous motion control strategy based on master-slave position following and a compression ratio control strategy based on artificial neural networks. A test prototype and simulation model were established, and the model was verified by the prototype. The performance of the control strategy was studied through simulation analysis. The results showed that the engine achieved stable operation and the compression ratio was well controlled. Compared with the reported control strategies in the literature, the artificial neural network algorithm applied in free-piston engine generator system shows better control accuracy and good response characteristics.

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“…The mechanical frequency of the free piston engine is lies usually in the range of 30 Hz [13][14][15][16][17][18]. By assuming that the power delivered to the electric motor side is constant, the pulsating term goes to the DC link and it has to be absorbed by the capacitor.…”

Section: Output Power Conditions Of a Free Piston Linear Generatormentioning

confidence: 99%

Design considerations of a linear generator for a range extender application

Seo

Riemer

Appunn

et al. 2015

Archives of Electrical Engineering

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Abstract:The free piston linear generator is a new range extender concept for the application in a full electric vehicle. The free piston engine driven linear generators can achieve high efficiency at part and full load which is suitable for the range extender application. This paper presents requirements for designing a linear generator deduced from a basic analysis of a free piston linear generator.

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Experimental Evaluation of a Prototype Free Piston Engine - Linear Alternator (FPLA) System

Cited by 40 publications

References 18 publications

Advanced combustion free-piston engines: A comprehensive review

Advanced combustion free-piston engines: A comprehensive review

Compression Ratio Control of an Opposed-Piston Free-Piston Engine Generator Based on Artificial Neural Networks

Design considerations of a linear generator for a range extender application

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