An efficient, power-enhanced ignition system

Rohwein, G.J.

doi:10.1109/27.602504

Cited by 27 publications

(8 citation statements)

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“…Along with the capacitor discharge, the voltage across the spark gap drops rapidly. A breakdown enhanced ignition system, for example, the peaking capacitor technique, [22][23][24] utilizes a high-voltage capacitor (\ 200 pF) to increase the pre-breakdown energy storage and thus the energy deposition rate immediately following the breakdown. The peaking capacitor not only increases the breakdown energy but also withholds a longer period for the high voltage because of the increased time constant of the capacitor discharge.…”

Section: Ignition Powermentioning

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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Section: Ignition Powermentioning

confidence: 99%

Future gasoline engine ignition: A review on advanced concepts

Zheng

2020

International Journal of Engine Research

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“…It should be noted that the increase in spark plug resistance can reduce the transient current and lower the peak power achieved during the breakdown phase. 26 To avoid this from happening, a non-resistive spark plug is used in this application, 25,26,32,33 or the embedded resistor of the spark plug should be placed upstream of the parallel capacitor. 24 Experimental setup…”

Section: High-power Spark Dischargementioning

confidence: 99%

“…Some prominent advantages include the higher energy transfer efficiency from electrical supply to the plasma channel, as well as the much higher plasma temperature. 24–33 For instance, Rohwein’s 25 research results have revealed that the energy transfer efficiency of the ignition system could increase to nearly 50% by adding a 80 pF high-voltage capacitor to the spark plug, which in turn improved the fuel economy of the vehicle and lowered the hydrocarbon emissions. Yu et al’s 26 study has demonstrated that the lean limit of ignition under quiescent conditions could be extended from 1.7 to 2.0, owing to the high peak discharge current (up to 250 A) and the enhanced transient power during the breakdown phase (around 3 MW) when a 200 pF capacitor was connected in parallel to the spark plug gap.…”

Section: Introductionmentioning

confidence: 99%

Effect of spark discharge energy scheduling on ignition under quiescent and flow conditions

Yang

Zhu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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The enhancement of the breakdown power during the spark discharge process has been proved to be beneficial for the flame kernel formation process under lean/diluted conditions. Such a strategy is realized by using a conventional transistor coil ignition system with an add-on capacitance in parallel to the spark plug gap in this paper. In practical application, the use of different ceramic material other than aluminum oxide can change the parasitic capacitance of the spark plug, achieving similar effect in terms of rescheduling the discharge energy released during the breakdown phase. Detailed research has been carried out to investigate the effect of the parallel capacitance and the cross flow velocity on the flame kernel formation and propagation process. With the increase in parallel capacitance, more spark energy is delivered during the breakdown phase, while less energy is released during the arc/glow phase. Shadowgraph images of the spark plasma reveal that the high-power spark discharge can generate a larger high-temperature area with enhanced electrically prompted turbulence under quiescent conditions, as compared with that using the conventional transistor coil ignition discharge strategy under the same condition. The breakdown enhanced turbulence of the high-power spark is proved to be beneficial for the flame kernel development, especially with the lean or exhaust gas recirculation diluted combustible mixtures, given that sufficient spark energy is available for the high-power spark strategy to successfully generate the breakdown event. The results of combustion tests under flow conditions reveal that the breakdown enhanced turbulence of the high-power spark tends to be overshadowed by the turbulence generated from the flow field, and both the increase in flow velocity and parallel capacitance contribute to the reduction in discharge duration of the arc/glow phase. Therefore, the benefits brought about by the high-power spark discharge tend to diminish with the intensification of flow velocity.

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“…Traditional method of coils development is based on experiments and experience, which has disadvantages of time and material wasting. Computer simulation technology provides developers an effective platform, which meets the requirement of optimal design [2,3] .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Ignition Energy Efficiency for Automotive Ignition Coils

Chen

Zhang

2010

2010 Asia-Pacific Power and Energy Engineering Conference

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The performance of ignition coils is an important and complicated consideration of automotive power system. How to analyze the effect of technological parameters on the ignition energy with the help of ignition coils performance simulation model is proposed in this paper. Based on electric circuit analysis and magnetic circuit analysis, the model is built to calculate ignition current, spark time and ignition energy, and predict the tendency of ignition energy with the variations of the technological parameters such as coil turns, wire diameter and the length of iron core. Experiments show that the relative errors of simulation results are less than 5%, which indicates the validity and rationality of the method.

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An efficient, power-enhanced ignition system

Cited by 27 publications

References 1 publication

Future gasoline engine ignition: A review on advanced concepts

Future gasoline engine ignition: A review on advanced concepts

Effect of spark discharge energy scheduling on ignition under quiescent and flow conditions

Analysis of Ignition Energy Efficiency for Automotive Ignition Coils

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