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Investigation of a Two-Valve Electronically Controlled Unit Injector on a Euro Iv Heavy-Duty Diesel Engine Using Design of Experiment Methods
Published November 26, 2002 by Institution of Mechanical Engineers in United Kingdom
Event: Fuel Injection Systems
This paper reports the results of a test program on a heavy-duty, single-cylinder diesel engine equipped with cooled exhaust gas recirculation (EGR) and a two-valve electronically controlled unit injector (EUI).
The test data were modeled using a stochastic process modelling technique (SPM). Optimized settings were identified for two scenarios: lowest fuel consumption, and lowest particulate emissions.
The ability of the two-valve EUI to increase nozzle opening pressure greatly improved particulate emissions at Euro IV NOx levels and beyond. Pilot and post injections were shown to have some benefit below Euro IV NOx levels.