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High pressure fuel injection systems, such as common rail (CR) systems and electronically-controlled unit injector (EUI) systems, have been widely applied to modern heavy duty diesel engines. They are shown to be very effective for achieving high power density with high fuel efficiency and low exhaust gas emissions. However, the increased peak combustion pressure gives additional structural stress and thermal load to engine structure. Thus, proper material selection and thermal analysis of engine components are essential in order to meet the durability requirements of heavy-duty diesel engines adopting a high pressure injection system. In this paper, thermal analysis of a 12.9 ℓ diesel engine with an EUI system was studied. Temperatures were measured on a cylinder head, a piston and a cylinder liner. A specially designed linkage system was used to measure the piston temperatures. A radio-tracer technique was also used to verify the rotation of piston rings.

Nowadays the use of clean fuel on vehicles is actively studied to prevent air pollution in cities. Because of this social need, KIA has developed various vehicles that use alternative fuels[1,2,3,4]. In this study the development of a CNG (Compressed Natural Gas) vehicle that was converted from a 2.0 ℓ Sportage, multi-purpose vehicle, is described. The development of its engine, the conversion of the vehicle, its EMS (Engine Management System), and the reduction of its emissions are discussed.