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Energies 2017, 10(1), 47; doi:10.3390/en10010047

Effects of a Dual-Loop Exhaust Gas Recirculation System and Variable Nozzle Turbine Control on the Operating Parameters of an Automotive Diesel Engine

Internal Combustion Engines Group (ICEG), Department of Mechanical, Energy, Management and Transportation Engineering (DIME), University of Genoa, via Montallegro 1, 16145 Genoa, Italy
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Academic Editor: George Kosmadakis
Received: 23 September 2016 / Revised: 3 November 2016 / Accepted: 21 December 2016 / Published: 4 January 2017
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Abstract

Reduction of NOX emissions and fuel consumption are the main topics in engine development, forcing the adoption of complex techniques and components, whose interactions have to be clearly understood for proper and reliable operations and management of the whole system. The investigation presented in this paper aimed at the development of integrated control strategies of turbocharging, high pressure (HP) and low pressure (LP) exhaust gas recirculation (EGR) systems for better NOX emissions and fuel consumption, while analyzing their reciprocal influence and the resulting variations of engine quantities. The study was based on an extended experimental program in three part load engine operating conditions. In the paper a comparison of the behavior of the main engine sub-systems (intake and exhaust circuits, turbocharger turbine and compressor, HP and LP EGR loops) in a wide range of operating modes is presented and discussed, considering open and closed loop approaches for variable nozzle turbine (VNT) control, and showing how these affect engine performance and emissions. The potential of significant decrease in NOX emissions through the integration of HP and LP EGR was confirmed, while a proper VNT management allowed for improved fuel consumption level, if an open loop control scheme is followed. At higher engine speed and load, further actions have to be applied to compensate for observed soot emissions increase. View Full-Text
Keywords: diesel engine; exhaust gas recirculation (EGR); low pressure (LP) EGR circuit; proportion of high pressure (HP) and LP EGR; variable nozzle turbine (VNT); pollutant emissions; fuel consumption; NOX-soot trade-off diesel engine; exhaust gas recirculation (EGR); low pressure (LP) EGR circuit; proportion of high pressure (HP) and LP EGR; variable nozzle turbine (VNT); pollutant emissions; fuel consumption; NOX-soot trade-off
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zamboni, G.; Moggia, S.; Capobianco, M. Effects of a Dual-Loop Exhaust Gas Recirculation System and Variable Nozzle Turbine Control on the Operating Parameters of an Automotive Diesel Engine. Energies 2017, 10, 47.

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