Influences on the Formation of Deposits on Injection Nozzles in Direct-Injection Diesel Engines

Striving towards a robust design of direct-injection diesel combustion processes poses a major challenge for longterm reliability of engine performance. The long range reduction of power is a result predominantly forced by deposits in the nozzle orifice. In the scope of the FVV research project “Coking”, No. 14567 N, the Institute of Combustion Engines in Aachen (VKA) of RWTH Aachen University (Germany) determined important parameters accelerating or decelerating the formation of nozzle fouling. The objectives of a 6.3-l truck engine were the realization and detailed characterization of measures to impede or even inhibit nozzle coking.