This reference publication presents a accomplished perception into todays diesel injection platforms and digital keep an eye on. It focusses on minimizing emissions and exhaust-gas therapy. recommendations by way of Bosch within the box of diesel-injection know-how have made an important contribution to the diesel growth. demands reduce gasoline intake, decreased exhaust-gas emissions and quiet engines are making larger calls for at the engine and fuel-injection structures.
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1 Direct injection 3 1 Fig. 1 1 Multihole injector 2 ω piston recess 3 Glow plug æ UMK0315-1Y 2 Undivided combustion chamber (direct-injection engines) Direct-injection engines (Fig. 1) have a higher level of efficiency and operate more economically than indirect-injection engines. Accordingly, they are used in all types of commercial vehicles and most modern diesel cars. As the name suggests, the direct-injection process involves injecting the fuel directly into the combustion chamber, part of which is formed by the shape of the piston crown (piston crown recess, 2).
Exhaust-gas treatment systems for NOx and particulate filters use catalysts. They must run on sulfur-free fuel since sulfur poisons the active catalyst surface. Carbon-deposit index The carbon-deposit index describes a fuel’s tendency to form carbon residue on injection nozzles. The processes of carbon depositing are highly complex. Above all, components which the diesel fuel contains at the final boiling point (particularly cracking constituents) influence carbon-deposit formation (coking). Fig.
This takes place at a constant gas volume (completely and at infinite speed). The initial situation is thus restored and a new operating cycle begins. 3' qBV 2 W 4 1 TDC BDC Cylinder volume qA V æ SMM0611E TDC Top dead center BDC Bottom dead center 1 Cylinder pressure Fig. 1 1-2 Isentropic compression 2-3 Isochoric heat propagation 3-3Ј Isobaric heat propagation 3Ј-4 Isentropic expansion 4-1 Isochoric heat dissipation p-V chart of the real process To determine the work done in the real process, the pressure curve in the cylinder is measured and presented in the p-V chart (Fig.