Hanyang University · Engineering
Professor Kihyung Lee's research lab specializes in advanced internal combustion engine technologies, focusing on low-emission and high-efficiency combustion systems. Key research directions include two-stage and controlled autoignition (CAI/HCCI) combustion, high-pressure fuel injection systems, and spray dynamics in direct-injection engines. The lab investigates fundamental spray characteristics, such as droplet size, velocity, and impingement behavior on hot surfaces, to optimize combustion and reduce NOx and soot emissions. The work also addresses real-world driving cycle impacts on fuel efficiency and emissions, particularly under WLTP conditions.
Figures are computed from collected data and may differ slightly.
The aim of this study was to confirm the effects of two-stage combustion on the combustion and NOx reduction characteristics of a four cylinder direct injection diesel engine. In order to analyze the combustion and emission characteristics, various injection parameters, such as injection quantity, injection timing and injection pressure were used under constant engine speed and engine load. In addition, the experimental results of two-stage combustion are compared to the single injection when in
Higher speeds, faster acceleration and longer duration need a more realistic driving cycle. As a result, a new test procedure that reflects real-world driving conditions has been applied since 2017, and the previous development environment optimized for NEDC has also changed. In this study, several factors and technologies relating to fuel consumption, such as vehicle weight, tire rolling resistance, drag of aerodynamic, stop–start, and 48 V mild hybrid system, are evaluated as per the new world
Homogeneous charge compression ignition (HCCI) combustion provides extremely low levels of pollutant emissions, and thus is an attractive alternative for future IC engines. In order to achieve a uniform mixture distribution within the engine cylinder, the characteristics of the fuel spray play an important role in the HCCI engine concept. It is well known that high-pressure common rail injection systems, mainly used in diesel engines, achieve poor mixture formation because of the possibility of
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