Influence of High Frequency Ignition on the Combustion and Emission Behaviour of Small Two-Stroke Spark Ignition Engines

Hampe, Clemens; Bertsch, Markus; Beck, Kai W.; Spicher, Ulrich; Bohne, Steffen; Rixecker, Georg

doi:10.4271/2013-32-9144

Cited by 10 publications

(4 citation statements)

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“…A passive pre-chamber consisting of a cover with holes encapsulated a smaller volume of fluid. As shown in Figure 14, the pre-cham- Several studies demonstrated that the early flame propagation had been accelerated, and the dilution limitation was extended, resulting in more stable operation, improved fuel economy, and provides further efficiency benefits [235,[256][257][258]. A less than 3% of the "coefficient of variation.…”

Section: Turbulent Jet Igniters (Tji)mentioning

confidence: 99%

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

2022

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Improving thermal efficiency and reducing carbon emissions are the permanent themes for internal combustion (IC) engines. In the past decades, various advanced strategies have been proposed to achieve higher efficiency and cleaner combustion with the increasingly stringent fuel economy and emission regulations. This article reviews the recent progress in the improvement of thermal efficiency of IC engines and provides a comprehensive summary of the latest research on thermal efficiency from aspects of thermodynamic cycles, gas exchange systems, advanced combustion strategies, and thermal and energy management. Meanwhile, the remaining challenges in different modules are also discussed. It shows that with the development of advanced technologies, it is highly positive to achieve 55% and even over 60% in effective thermal efficiency for IC engines. However, different technologies such as hybrid thermal cycles, variable intake systems, extreme condition combustion (manifesting low temperature, high pressure, and lean burning), and effective thermal and energy management are suggested to be closely integrated into the whole powertrains with highly developed electrification and intelligence.

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Section: Turbulent Jet Igniters (Tji)mentioning

confidence: 99%

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

2022

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“…The RF energy can be efficiently delivered to the discharge tips only if the system is optimally tuned, including treating the cylinder charge as a part of the electric circuit-a virtual capacitor. According to the publicized results, 51,[81][82][83][84][85][86][87][88][89][90][91][92][93] to date, the leading contenders for RF corona ignition prototyping includes the advanced corona ignition system (ACIS) by Federal Mogul and the Ecoflash corona ignition system by BorgWarner. One of the challenges of RF corona ignition is ensuring the inception of corona discharge while avoiding arc touchdown, especially in high-density conditions when a higher voltage is demanded.…”

Section: Rf Corona Ignitionmentioning

confidence: 99%

“…Extensive research on the RF corona ignition was carried out on SI engines, mainly operating at partial and light loads, where the ignition consistency is a challenging issue. [85][86][87] The results revealed that the early flame propagation was accelerated, and the dilution limits were extended, leading to more stable operations and better fuel economy. Full-range engine operations with IMEP up to 2.7 MPa equipped with RF corona ignition system was demonstrated by Wolf.…”

Section: Rf Corona Ignitionmentioning

confidence: 99%

Future gasoline engine ignition: A review on advanced concepts

Zheng

2020

International Journal of Engine Research

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To meet the future requirements of fuel economy and exhaust emissions, high-efficiency gasoline engines tend to employ diluted combustion concepts along with intensified charge motion and stratified mixtures. Securing the ignition of such mixtures over the full engine operation range is challenging, because of the lowered mixture reactivity and increased discrepancy of stoichiometry. In recent years, increasing research efforts have been spending on innovations of ignition technologies to tackle the challenges. In this paper, the directions of ignition improvement are highlighted based on the fundamental understanding of the ignition mechanisms. The working principles of the primary types of advanced ignition systems are introduced; and relevant engine and combustion vessel test results are reviewed. The ignition systems are categorized as: (1) high-energy spark ignition, (2) pulsed nanosecond discharge ignition, (3) radio-frequency plasma ignition, (4) laser-induced plasma ignition, and (5) pre-chamber ignition. The advanced ignition systems are commented, regarding the ignition effectiveness and the implementation challenges, according to the literatures and the extensive empirical work at the authors’ laboratory.

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“…To mention are the research works on: injection, mixture preparation and combustion, [1,2,3]; ignition, [4]; alternative fuels, [5] and some previous fundamental research efforts from Graz University of Technology (GUT) and AVL, [6,7,8,9].…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Particle Emissions of Modern Handheld Machines

Czerwiński

Kurzwart²,

Mayer

et al. 2014

SAE Technical Paper Series

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The progressing exhaust gas legislation for on-and off-road vehicles includes gradually the nanoparticle count limits. The invisible nanoparticles from different emission sources penetrate like a gas into the living organisms and may cause several health hazards. The present paper shows some results of a modern chain saw with & without oxidation catalyst, with Alkylate fuel and with different lube oils. The measurements focused specially on particulate emissions. Particulates were analysed by means of gravimetry (PM) and granulometry SMPS (PN). In this way the reduction potentials with application of the best materials (fuel, lube oil, ox-cat.) were indicated. It has been shown that the particle mass (PM) and the particle numbers (PN), which both consisting almost exclusively of unburned lube-oil, can attain quite high values, but can be influenced by the lube oil quality and can be considerably reduced with an oxidation catalyst.

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Influence of High Frequency Ignition on the Combustion and Emission Behaviour of Small Two-Stroke Spark Ignition Engines

Cited by 10 publications

References 0 publications

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

Future gasoline engine ignition: A review on advanced concepts

Particle Emissions of Modern Handheld Machines

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