An improved EGR system concept for diesel engines towards fuel neutral emissions

Ivaldi, D.; Lisbona, M. G.; Tonetti, Marco

doi:10.1504/ijvd.2006.009673

Cited by 10 publications

(2 citation statements)

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“…In gasoline engines, EGR can also reduce knock occurrence at high load, thus limiting mixture enrichment and improving fuel consumption. In recent years, further developments were considered, starting from the adoption of low pressure (LP) circuit [3,4], as an alternative or coupled to the conventional high pressure (HP) loop [5][6][7]. Other aspects are related to the integration of EGR circuits with the main engine sub-assemblies, such as fuel injection equipment [8,9] and turbocharging systems [10], either in a single-stage configuration fitted with variable nozzle turbine (VNT) [11] or according to two-stage concepts [12].…”

Section: Introductionmentioning

confidence: 99%

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

2017

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Reduction of NO X 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 NO X 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 NO X 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.

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Section: Introductionmentioning

confidence: 99%

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

2017

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“…Both effects impact negatively the engine efficiency and emissions, especially if Low Temperature Combustion (LTC) concepts are applied [2]. LPEGR takes the exhaust gas downstream of the after-treatment system and drives it to the compressor inlet [3]. While the HPEGR routing has been traditionally preferred because of compressor wheel reliability, the widespread use of Diesel Particulate Filters (DPF) in current engines allows the use of LPEGR configuration [4].…”

Section: Introductionmentioning

confidence: 99%

Switching strategy between HP (high pressure)- and LPEGR (low pressure exhaust gas recirculation) systems for reduced fuel consumption and emissions

Luján

Guardiola

Plá

et al. 2015

Energy

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ElsevierLujan Martinez, JM.; Guardiola García, C.; Pla Moreno, B.; Reig, A. (2015). Switching strategy between HP (high pressure)-and LPEGR (low pressure exhaust gas recirculation) systems for reduced fuel consumption and emissions. Energy. 90:1790Energy. 90: -1798Energy. 90: . doi:10.1016Energy. 90: /j.energy.2015 Switching strategy between HP-and LPEGR systems for reduced fuel consumption and emissions AbstractExhaust gas recirculation (EGR) plays a major role in current Diesel internal combustion engines as a cost-effective solution to reduce NO x emissions. EGR systems will suffer a significant evolution with the introduction of NO x after-treatment and the proliferation of more complex EGR architectures such as low pressure EGR or dual EGR. In this paper the combination of high pressure EGR (HPEGR) with low pressure EGR (LPEGR) is presented as a method to minimise fuel consumption with reduced NO x emissions. Particularly, the paper proposes to switch between HPEGR and LPEGR architectures depending on the engine operating conditions in order to exploit the potential of both systems. In this sense, given a driving cycle, in the case at hand the NEDC, the proposed strategy seeks the EGR layout to use at each instant of the cycle to minimise the fuel consumption such that NO x emissions are kept below a certain limit. The experimental results obtained show that combining both EGR systems sequentially along the NEDC allows to reduce noticeably the NO x emissions of the HPEGR system with a small impact on the fuel consumption.

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Modeling of Particle Size Distribution at the Exhaust of Internal Combustion Engines

Scafati

Lavorgna

Mancaruso

et al. 2017

SpringerBriefs in Applied Sciences and Technology

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An improved EGR system concept for diesel engines towards fuel neutral emissions

Cited by 10 publications

References 0 publications

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

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

Switching strategy between HP (high pressure)- and LPEGR (low pressure exhaust gas recirculation) systems for reduced fuel consumption and emissions

Modeling of Particle Size Distribution at the Exhaust of Internal Combustion Engines

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