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New concepts to avoid unwanted pollutants from d.i. diesel engines in passenger cars

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Heitland H. , Rinne G.

tom Vol. 10, No. 1-2

25-31

The self ignition process in Diesel engines with direct injection takes place simultaneously with the disintegration of the injected fuel together with the evaporation of the spray s and the droplets. With shorter ignition delays it is possible to improve the combustion process and reach higher efficiencies of the engine. Also a partly homogeneous combustion could be established in order to reach less formation of soot and NOX. One way to create this favourable combustion process is to work with a ring piston, which allows to achieve two different compression ratios: a higher one in the ring area for self ignition of the Diesel spray and a lower one for the homogenous combustion in the central main chamber. Another way is a double injection into the main chamber, one for ignition, the other for combustion of the major fuel, which must be injected at the beginning of the compression phase. The first concept uses the common rail injector, the last one the VW unit injector. Both concepts need no particle filter or oxi-catfor the fulfilment of emission regulations.