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Pyun, Sung Hyun
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Development of a Unique Plasma Burner System for Emission Reduction During Cold Start of Diesel Engines

Korea Institute of Machinery & Materials-Sung Hyun Pyun, Dae Hoon Lee, Kwan Tae Kim
Published 2014-04-01 by SAE International in United States
Plasma burner of a new concept is suggested, developed and characterized as a unique SCR catalyst warm-up technology. This study shows a promising potential of using a plasma burner for rapid warm-up performance, minimizing fuel consumption and maximizing flame stability regardless of the temperature, oxygen concentration and flow velocity of exhaust gas in diesel engines. Since the oxygen and fuel source of the plasma burner are separated from the exhaust gas line, the performance of the plasma burner can be used regardless of engine conditions, such as engine speed and oxygen concentration.This study shows that the plasma burner can be used as an effective and promising tool for clean and energy efficient NOx and HC aftertreatment system for diesel engines.
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Crank-angle-resolved Measurements of Air-fuel Ratio, Temperature, and Liquid Fuel Droplet Scattering in a Direct-injection Gasoline Engine

Nissan Motor Co., Ltd.-Kevin R. Sholes, Kiyotaka Shouji, Tomohiro Chaya
Stanford University-Jay B. Jeffries, Jason M. Porter, Sung Hyun Pyun, Ronald K. Hanson
Published 2010-10-25 by SAE International in United States
Simultaneous crank-angle-resolved measurements of gasoline vapor concentration, gas temperature, and liquid fuel droplet scattering were made with three-color infrared absorption in a direct-injection spark-ignition engine with premium gasoline. The infrared light was coupled into and out of the cylinder using fiber optics incorporated into a modified spark plug, allowing measurement at a location adjacent to the spark plug electrode. Two mid-infrared (mid-IR) laser wavelengths were simultaneously produced by difference-frequency-generation in periodically poled lithium niobate (PPLN) using one signal and two pump lasers operating in the near-infrared (near-IR). A portion of the near-IR signal laser residual provided a simultaneous third, non-resonant, wavelength for liquid droplet detection. This non-resonant signal was used to subtract the influence of droplet scattering from the resonant mid-IR signals to obtain vapor absorption signals in the presence of droplet extinction.The sensor was applied to a direct-injection engine in both early-injection homogeneous charge and late-injection stratified charge operation. For the early-injection cases, liquid droplets were detected only during a brief period of the intake stroke just after start of injection. Late in theā€¦
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