Experimental Investigations for Meeting Standards of Diesel Engine Visible Emissions

Abstract

The paper presents research work done on a turbocharged direct injection diesel engine for the meeting of visible emissions according to ECE 24 Regulation. The engine 392-L4 DT was tested on the dynamometric bench being measured specific performances on total speed characteristics (power, torque, specific fuel consumption, charge air pressure and exhaust gas temperature) and visible emissions - in terms of smoke number (Ns) expressed in Hartridge smoke units (HSU). Several experimental settings were done in order to reduce smoke emissions, especially at lower speeds, by variation of the injector nozzle hole diameter and variation of turbocharger configurations.