Horsepower with Brains: The Design of the CHIRON Free Piston Engine

Achten, Peter; Oever, Johan P. J. van den; Potma, Jeroen; Vael, Georges

doi:10.4271/2000-01-2545

Cited by 89 publications

(88 citation statements)

References 9 publications

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“…Modern free-piston engine developments are mainly of the single piston and dual piston types with power extracted through a linear load device, usually in the form of a hydraulic cylinder or a LP HP (a) Single piston hydraulic free-piston engine [2].…”

Section: Modern Free-piston Engine Developmentsmentioning

confidence: 99%

“…Examples of modern freepiston engine configurations are shown in Figure 1. Single piston hydraulic free-piston engines, similar to that illustrated in Figure 1a, were presented by Achten et al [2] and Brunner et al [4]. The hydraulic cylinder acts as both load and rebound device using an advanced control system in the hydraulic circuit, and Achten et al demonstrated how excellent engine performance can be obtained with this method.…”

Section: Intake Port Piston Coilmentioning

confidence: 99%

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Coupled dynamic–multidimensional modelling of free-piston engine combustion

Mikalsen

Roskilly

2009

Applied Energy

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Free-piston engines are under investigation by a number of research groups worldwide, as an alternative to conventional technology in applications such as electric and hydraulic power generation. The piston dynamics of the freepiston engine differ significantly from those of conventional engines, and this may influence in-cylinder gas motion, combustion and emissions formation. Due to the complex interaction between mechanics and thermodynamics, the modelling of free-piston engines is not straight-forward. This paper presents a novel approach to the modelling of free-piston engines through the introduction of solution-dependent mesh motion in an engine CFD code. The particular features of free-piston engines are discussed, and the model for engine dynamics implemented in the CFD code is described. Finally, the coupled solver is demonstrated through the modelling of a spark ignited free-piston engine generator.

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Section: Modern Free-piston Engine Developmentsmentioning

confidence: 99%

Section: Intake Port Piston Coilmentioning

confidence: 99%

Coupled dynamic–multidimensional modelling of free-piston engine combustion

Mikalsen

Roskilly

2009

Applied Energy

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“…Alternative concepts are combustion engines like free piston engines with linear alternators, which directly produce electricity without driving a conventional generator (Achten et al, 2000;Max, 2005;Pohl and Gräf, 2005).…”

Section: Improving Drivetrain Efficiencymentioning

confidence: 99%

Transport impacts on atmosphere and climate: Land transport

Uherek¹,

Halenka²,

Borken‐Kleefeld³

et al. 2010

Atmospheric Environment

311

151

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a b s t r a c tEmissions from land transport, and from road transport in particular, have significant impacts on the atmosphere and on climate change. This assessment gives an overview of past, present and future emissions from land transport, of their impacts on the atmospheric composition and air quality, on human health and climate change and on options for mitigation.In the past vehicle exhaust emission control has successfully reduced emissions of nitrogen oxides, carbon monoxide, volatile organic compounds and particulate matter. This contributed to improved air quality and reduced health impacts in industrialised countries. In developing countries however, pollutant emissions have been growing strongly, adversely affecting many populations. In addition, ozone and particulate matter change the radiative balance and hence contribute to global warming on shorter time scales. Latest knowledge on the magnitude of land transport's impact on global warming is reviewed here.In the future, road transport's emissions of these pollutants are expected to stagnate and then decrease globally. This will then help to improve the air quality notably in developing countries. On the contrary, emissions of carbon dioxide and of halocarbons from mobile air conditioners have been globally increasing and are further expected to grow. Consequently, road transport's impact on climate is gaining in importance. The expected efficiency improvements of vehicles and the introduction of biofuels will not be sufficient to offset the expected strong growth in both, passenger and freight transportation. Technical measures could offer a significant reduction potential, but strong interventions would be needed as markets do not initiate the necessary changes. Further reductions would need a resolute expansion of low-carbon fuels, a tripling of vehicle fuel efficiency and a stagnation in absolute transport volumes. Land transport will remain a key sector in climate change mitigation during the next decades.

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“…Based on the unique features of SHFPE, the pulse pause modulation was used to regulate the output flow of the engine. The indicated efficiency, the specific NO emission, and the filter soot number were sensible to the compression pressure and the start of injection which must be controlled with an accuracy of ±2% [2][3][4]. Tikkanen of Tampere University of Technology proposed a dual-piston hydraulic free-piston engine (DHFPE) and studied the characteristics of the first cycles and the motion characteristics.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pressure Build-Up Time of Compression Chamber on Improving the Operation Frequency of a Single-Piston Hydraulic Free-Piston Engine

Xie

Ren

Yang

et al. 2013

Advances in Mechanical Engineering

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A single-piston hydraulic free-piston engine with a two-cylinder four-stroke diesel engine as its driver is introduced. It takes the free-piston assembly a certain time to move after the pressure in the compression chamber starts to increase. The time difference between the pressure increasing and the piston starting to move is defined as the pressure build-up time. The characteristics of the pressure build-up time and its influence on the performance of the free-piston engine are introduced and analyzed. Based on the basic law of dynamics of the free-piston assembly, the parameters which influence the pressure build-up time are analyzed. And then improvement and optimization are proposed to shorten the pressure build-up time.

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Horsepower with Brains: The Design of the CHIRON Free Piston Engine

Cited by 89 publications

References 9 publications

Coupled dynamic–multidimensional modelling of free-piston engine combustion

Coupled dynamic–multidimensional modelling of free-piston engine combustion

Transport impacts on atmosphere and climate: Land transport

Influence of Pressure Build-Up Time of Compression Chamber on Improving the Operation Frequency of a Single-Piston Hydraulic Free-Piston Engine

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