Experimental and Computational Analysis of Different EGR Systems for a Common Rail Passenger Car Diesel Engine

Millo, Federico; Ferraro, Carlo Vincenzo; Bernardi, Marco; Barbero, S.; Pasero, P.

doi:10.4271/2009-01-0672

Cited by 17 publications

(5 citation statements)

References 8 publications

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“…In the LP loop the increased EGR flow resulting from the opening of the LP EGR valve must pass through the compressor and the intercooler before reaching the intake manifold, whereas the HP EGR valve is located directly at the entrance of the intake manifold. This confirms results shown in [7] and [12]. Figure 7.…”

Section: Egr Valve Step Changes Involving a Single Egr Loopsupporting

confidence: 90%

“…That study showed a delay in the change of EGR fraction with the addition of LP EGR due to the increased loop volume. Millo et al [12] also used GT Power to conduct step changes of EGR fraction with both the HP and LP EGR valves. In addition to the delay in the change of EGR fraction with LP EGR seen by Reifarth and Angstrom, Millo's simulation showed that the LP EGR loop reached the final EGR target more quickly during an increasing-step change in EGR fraction, illustrating a difference in the relationship between EGR rate and the turbocharger behavior for the two loops.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Transient Response and Turbocharger Coupling for High and Low Pressure EGR Systems

Heuwetter¹,

Glewen²,

Foster³

et al. 2014

SAE Int. J. Engines

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The transient response of an engine with both High Pressure (HP) and Low Pressure (LP) EGR loops was compared by conducting step changes in EGR fraction at a constant engine speed and load. The HP EGR loop performance was shown to be closely linked to turbocharger performance, whereas the LP EGR loop was relatively independent of turbocharger performance and vice versa. The same experiment was repeated with the variable geometry turbine vanes completely open to reduce turbocharger action and achieve similar EGR rate changes with the HP and LP EGR loops. Under these conditions, the increased loop volume of the LP EGR loop prolonged the response of intake O2 concentration following the change in air-fuel ratio. The prolonged change of intake O2 concentration caused emissions to require more time to reach steady state as well. Strong coupling between the HP EGR loop and turbochargers was again observed using a hybrid EGR strategy. The potential benefit of the HP EGR loop's smaller volume and shorter residence time was largely negated by the simultaneous use of the larger LP EGR loop. Under these conditions, the intake charge oxygen concentration responded more quickly to actuation of the LP EGR valve than the HP EGR valve.

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Section: Egr Valve Step Changes Involving a Single Egr Loopsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Transient Response and Turbocharger Coupling for High and Low Pressure EGR Systems

Heuwetter¹,

Glewen²,

Foster³

et al. 2014

SAE Int. J. Engines

View full text Add to dashboard Cite

show abstract

“…The environmental impact and energy demand of road vehicles have recently become more significant, justifying the great effort to develop technological solutions to limit pollutant emissions while reducing engine fuel consumption, according to the requirements of the recent European Commission Regulation on the carbon dioxide emissions for new registered passenger cars [1]. The goal of CO 2 reduction contributed (especially in Europe) to an increasing market share of automotive diesel engines thanks to the introduction of several technologies, such as fuel direct injection, turbocharging systems fitted with advanced control devices [2,3], electronically controlled fuel injection systems and new exhaust system layout [4][5][6], with particular reference to after-treatment devices. On the other side, the need to reduce CO 2 emissions to enhance fuel economy in automotive spark ignition engine led car manufacturers to introduce different advanced technologies to be jointly adopted [7,8].…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis on the performance of a turbocharger compressor in the unstable operating region and close to the surge limit

Marelli

Carraro

Marmorato

et al. 2014

Experimental Thermal and Fluid Science

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“…Other advanced engine technologies often cause, or even require, increased EBP. For example, EGR in diesel engines is frequently driven by elevating the EBP or by throttling the intake [24,25]. LTC requires very high EGR rates, significantly increasing the required EBP.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Exhaust Back Pressure on Conventional and Low-Temperature Diesel Combustion

Cong

Garner

McTaggart-Cowan

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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Modern diesel engines are seeing increasing system and after-treatment complexity which can lead to significant increases in the exhaust back pressure (EBP). This increases the amount of trapped residuals, raising the charge temperature but reducing the oxygen concentration. In this work, these effects of the EBP on diesel engine performance and emissions under conventional and low-temperature diesel combustion (LTC) regimes were investigated. Increasing the EBP resulted in higher pumping work for both combustion modes. While for conventional diesel combustion the effect of the EBP on combustion and emissions were not significant, for LTC the higher back pressures influenced the combustion and emissions formation processes. At low-load conditions, the increase in the charge temperature advanced combustion; at intermediate-load conditions, the reduction in the oxygen concentration delayed it. Smoke emissions were significantly reduced by a higher back pressure at intermediate-load conditions.

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Experimental and Computational Analysis of Different EGR Systems for a Common Rail Passenger Car Diesel Engine

Cited by 17 publications

References 8 publications

Experimental Investigation of Transient Response and Turbocharger Coupling for High and Low Pressure EGR Systems

Experimental Investigation of Transient Response and Turbocharger Coupling for High and Low Pressure EGR Systems

Experimental analysis on the performance of a turbocharger compressor in the unstable operating region and close to the surge limit

The Effects of Exhaust Back Pressure on Conventional and Low-Temperature Diesel Combustion

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