Emission reduction through internal and low-pressure loop exhaust gas recirculation configuration with negative valve overlap and late intake valve closing strategy in a compression ignition engine

Kim, Jaeheun; Bae, Choongsik

doi:10.1177/1468087417692680

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…The application of more conventional techniques can be supported by pressure diagrams analysis. In [7], internal and low pressure EGR were compared to the high pressure loop in a single cylinder diesel engine, using pressure and ROHR curves to assess the influence of intake valve closing strategies. Among the different results, it was shown that a proper combination of valve overlap, internal and low pressure EGR allowed to decrease pumping losses and fuel consumption, without affecting heat release and emission levels referring to the activation of standard high pressure EGR circuit.…”

Section: Introductionmentioning

confidence: 99%

A Study on Combustion Parameters in an Automotive Turbocharged Diesel Engine

Zamboni

2018

Energies

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A wide experimental database on indicated pressure diagrams measured on a turbocharged diesel engine, equipped with high and low pressure exhaust gas recirculation (EGR) circuits and a variable nozzle turbine (VNT), was processed to evaluate a large set of combustion parameters. Available data were referred to different tests in three part load operating conditions, focused on High Pressure EGR trade-off and the development of integrated control strategies for EGR and turbocharging systems aiming at NOX and fuel consumption reduction. According to their definition, combustion parameters were derived from pressure diagrams, its first derivative and heat release curves. Their calculation allowed enlarging the information content of measured in-cylinder pressure diagrams. Several linear correlations were then defined, linking engine operating, energy and environmental quantities to combustion parameters, useful for the analysis and modeling of in-cylinder processes and engine behavior. The influence of testing conditions on these relationships was also analyzed, referring to the investigated operating modes and the adoption of open and closed loop scheme for VNT management. Finally, general correlations were defined, linking NOX and soot emissions to selected quantities.

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Section: Introductionmentioning

confidence: 99%

A Study on Combustion Parameters in an Automotive Turbocharged Diesel Engine

Zamboni

2018

Energies

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“…In Reference [10], internal and low-pressure recirculation were compared to the HP loop in a single cylinder diesel engine. Pressure and heat release curves allowed to evaluate the influence of intake valve closing strategies.…”

Section: Analysis Of Indicated Pressure Diagrams In Recent Literaturementioning

confidence: 99%

Influence of Fuel Injection, Turbocharging and EGR Systems Control on Combustion Parameters in an Automotive Diesel Engine

Zamboni

2019

Applied Sciences

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Indicated pressure diagrams were measured during experimental campaigns on the control of fuel injection, turbocharging and hybrid exhaust gas recirculation systems in an automotive downsized diesel engine. Three-part load operating conditions were selected for four test sets, where strategies aimed at the reduction of NOX emissions and fuel consumption, limiting penalties in soot emissions and combustion noise were applied to the selected systems. Processing of in-cylinder pressure signal, its first derivative and curves of the rate of heat release allowed us to evaluate seven parameters related to the combustion centre and duration, maximum values of pressure, heat release and its first derivative, heat released in the premixed phase and a combustion noise indicator. Relationships between these quantities and engine operating, energy and environmental parameters were then obtained by referring to the four test sets. In the paper, the most significant links are presented and discussed, aiming at a better understanding of the influence of control variables on the combustion process and the effects on engine behaviour. The proposed methodology proved to be a consistent tool for this analysis, useful for supporting the application of alternative fuels or advanced combustion modes.

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“…24 Extreme LIVC profiles and elevated boost pressures were utilized in the present work to experimentally push the boundaries of the typical IVC operating range seen in the literature. 25,26 The experiments were conducted in the following three stages: First, the effect of high boost pressures on engine emissions and fuel conversion efficiency is analyzed when using conventional intake valve closing timing (CIVC). Second, the effect of extreme Miller strategies on the combustion process is analyzed at constant composition.…”

Section: Introductionmentioning

confidence: 99%

Extreme Miller cycle with high intake boost for improved efficiency and emissions in heavy-duty diesel engines

Garcia

Triantopoulos

Trzaska

et al. 2021

International Journal of Engine Research

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This study experimentally investigates the impact of extreme Miller cycle strategies paired with high intake manifold pressures on the combustion process, emissions, and thermal efficiency of heavy-duty diesel engines. Well-controlled experiments isolating the effect of Miller cycle strategies on the combustion process were conducted at constant engine speed and load (1160 rpm, 1.76 MPa net IMEP) on a single cylinder research engine equipped with a fully-flexible hydraulic valve train system. Late intake valve closing (LIVC) timing strategies were compared to a conventional intake valve profile under either constant cylinder composition, constant engine-out NOx emission, or constant overall turbocharger efficiency ([Formula: see text]) to investigate the operating constraints that favor Miller cycle operation over the baseline strategy. Utilizing high boost with conventional intake valve closing timing resulted in improved fuel consumption at the expense of sharp increases in peak cylinder pressures, engine-out NOx emissions, and reduced exhaust temperatures. Miller cycle without EGR at constant [Formula: see text] demonstrated LIVC strategies effectively reduce engine-out NOx emissions by up to 35%. However, Miller cycle associated with very aggressive LIVC timings led to fuel consumption penalties due to increased pumping work and exhaust enthalpy. LIVC strategies allowed for increased charge dilution at the baseline NOx constraint of 3.2 g/kWh, resulting in significant fuel consumption benefits over the baseline case without compromising exhaust temperatures or peak cylinder pressures. As Miller cycle implementation was shown to affect the boundary conditions dictating [Formula: see text], the LIVC and conventional IVC cases were studied at an equivalent [Formula: see text] point representative of high boost operation. With high boost, LIVC yielded reduced NOx emissions, reduced peak cylinder pressures, and elevated exhaust temperatures compared to the conventional IVC case without compromising fuel consumption.

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Emission reduction through internal and low-pressure loop exhaust gas recirculation configuration with negative valve overlap and late intake valve closing strategy in a compression ignition engine

Cited by 9 publications

References 24 publications

A Study on Combustion Parameters in an Automotive Turbocharged Diesel Engine

A Study on Combustion Parameters in an Automotive Turbocharged Diesel Engine

Influence of Fuel Injection, Turbocharging and EGR Systems Control on Combustion Parameters in an Automotive Diesel Engine

Extreme Miller cycle with high intake boost for improved efficiency and emissions in heavy-duty diesel engines

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