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In medium and heavy duty engines for vehicles heavier than 3.5 tons(GVW), an implementation of lean burn technology is very important to lower thermal load and enhance fuel economy. To meet EURO-5 emission regulations, the optimized emission characteristics are also important design factors. In this work, with lean burn technology, a swirl enhancing valve was used in the intake port to improve combustion. Also, the injection position was varied to see its effect on stratification of air fuel mixture, which thus may enhance lean burn characteristics. This work concludes that, when the fuel was injected toward tumble port, the COV became flat over the wider range of ignition timing and the exhaust temperature was lowered. And, with tumble port injection, the torque was slightly increased and there exist conditions where NOx was reduced at the same level of torque compared with the baseline case.

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UCI(KEPA) : I410-ECN-0101-2009-556-015697741