(1-01) Evaluation of the Potential of Passenger Car Common Rail Injection by Simultaneous Application of In-Cylinder Fuel and Flame Detection((DE-1)Diesel Engine Combustion 1-Combustion and Emission Control)
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概要
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Current emission legislation forces the automotive industry to significantly reduce the exhaust gas emissions of passenger cars. Especially the contributions of soot and nitrogen oxide of diesel engines will be the main problems in the future. Here, exhaust gas aftertreatment systems could be a possible solution but since modern injection systems-like common rail-deliver more degrees of freedom referring to the injection process, also the exhaust gas reduction by optimisation of the combustion process has a high potential. In this study, a passenger car common rail system applied to an optically accessible one-cylinder transparent engine (AUDI V6 TDI) was investigated by simultaneously detecting spray and flame propagation. When using a pre-injection, the following main injection ignites almost without any ignition delay. Therefore a spatial coexistence of liquid phase and flame can be observed over a large part of the engine cycle. The lack of oxygen in the areas where the flame can be detected enlarges the danger of higher soot formation because the quality of fuel evaporation and mixture formation is reduced. The comparison of a conventional common rail injector to a piezo-driven injector at identical rail pressures showed advantages for the piezo-driven system. The fuel intake is much faster but the tendency to develop a wall film is not higher. The reasons for this can be found in stronger wave structures of the injected fuel which is an assumption for better air entrainment and vaporisation of the fuel. Careful dimensioning of those systems might completely avoid a wall film in the combustion bowl.
- 2001-07-01
著者
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Fettes C.
Department of Technical Thermodynamics University of Erlangen-Nurnberg
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Heimgartner C.
Department of Technical Thermodynamics University of Erlangen-Nurnberg
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Leipertz A.
Department of Technical Thermodynamics University of Erlangen-Nurnberg