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Optimization of Injection Parameters on An Idi Diesel Engine for the Reduction of Exhaust Emissions
Published June 21, 1995 by Societe des Ingenieurs de l'Automobile in France
Improvement and optimization of fuel injection systems is a necessary step towards the reduction of emissions and fuel consumption of IDI diesel engines. This optimization work can be done with the knowledge of relations existing between injection parameters (injection rate, injection pressure) and combustion and pollutant emissions measured on the engine. In this paper we present an exhaustive characterization of a large number of injection systems on the engine test bed (1.9 I NA IDI), and on the injection test bench. From the results we obtained, we were able to extract some characteristic parameters for emissions and fuel consumption, based on the apparent heat release (combustion phasing in the cycle, combustion velocity), on the fuel spray trajectory in the prechamber (spray impact and recirculation), and on the injection rate and injection pressure. The different parameters and their respective effects are detailed for each pollutant and for the brake specific fuel consumption.