A Combustion Concept for Future Heavy-Duty Diesel Engines

摘要: The Diesel engine has been intensively developed by manufacturers and researchers since 1892, when it was invented. However, the direction of its development shifted in recent years. Environmental issues are becoming increasingly important our society, prompting more efforts to be put into making engines cleaner. Ways which this can achieved include use exhaust filters or catalysts, improvements combustion system. Manufacturers are being obliged emissions legislation make strenuous develop cleaner engines. In order create a mode diesel that reduces both NOx PM good fuel distribution an appropriate gaseous mixture is needed; promoted long ignition delay injection strategies. temperature (both terms and local maxima) also strong effect on emissions. local gas during altered changing equivalence ratio charge gas composition. work presented thesis focused new concepts aimed at reducing nitric oxide particulate matter (PM) emissions, while keeping consumption low. In studies underlying thesis, experiments, including optical measurements, were performed single-cylinder research with geometry based Volvo Powertrain D12C heavy-duty Chalmers University Technology. Several hardware modifications made engine. A low compression piston used lowers cylinder thus lengthens between start ignition. common rail system gives flexibility in terms timing, injector nozzle chosen, eight orifices small diameter, together high pressure, provides break-up evaporation. Multiple injections combined EGR pressures have potential reduce engine-out without increasing consumption. very large applying multiple levels, impossible state global optimum reached, hence there will endless scope for further development. way realize two-regime concept proposed; lean rich regime - PPDC (Partly Premixed Diffusion Combustion). By using one can exploit advantages HCCI conventional diffusion controlled combustion. non-igniting premix main controls