首页|THE INFLUENCE OF INJECTION PRESSURE, BOOST PRESSUREAND EGR ON EMISSIONS AND FUEL CONSUMPTION OF A HEAVYDUTYDIESEL ENGINE
THE INFLUENCE OF INJECTION PRESSURE, BOOST PRESSUREAND EGR ON EMISSIONS AND FUEL CONSUMPTION OF A HEAVYDUTYDIESEL ENGINE
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One of the great challenges in meeting future emission restrictions affectingH。D。 diesel engines is the simultaneous reduction of Nox and soot emissions， withoutworsening fuel consumption。 Among the different available strategies， the optimization of theinjection parameters， combined with the efficient management of intake air and the use ofexhaust gas recirculation (EGR)， seems to have still a huge potential of improvement。With the aim to explore the effects of injection pressure， boost pressure， and EGR on soot，Nox， and BSFC， a study was conduced in a diesel engine fitted with a common-rail injectionsystem。 The study combined performance and emissions measurements together with heatrelease law analysis。 Tests were done at high load modes from the European Steady state testCycle (ESC)， because approximately 70% of the Nox produced during the ESC emissions testis produced at high load。 The results of the studies have been ultimately evaluated by usingthe parameters object of optimisation。 These have been， mainly， Nox and soot emissions andBSFC。 Other secondary parameters have been also calculated， and have been employed in theevaluation， at least only to ensure that no excessive limits were surpassed， as in the case ofCO emissions。Results have shown that the targeted emission levels can be attained with EGR and amoderate increase of boost pressure and an important increase in injection pressure。
Diesel combustioninjectionpollutant emissions.
Desantes、J. M.、Benajes J.、Riesco、De Rudder、K.
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CMT- Motores Térmicos, Universidad Politécnica de Valencia, Spain
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