Potential of the Miller cycle on a HSDI diesel automotive engine

Rinaldini, Carlo Alberto; Mattarelli, Enrico; Golovitchev, Valeri

doi:10.1016/j.apenergy.2013.05.056

Cited by 65 publications

(29 citation statements)

References 28 publications

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“…This provides internal cooling and a lower temperature at the end of compression is achieved, which results in lower NO x emissions [3]. In [4] a 2.8l 4 cylinder automotive diesel engine was studied and Inlet Valve Closure was varied between…”

Section: Introductionmentioning

confidence: 99%

Experimental study of NO reduction on a medium speed heavy duty diesel engine by the application of EGR (exhaust gas recirculation) and Miller timing

Verschaeren

Schaepdryver

Serruys

et al. 2014

Energy

113

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8Emission legislation that applies to engines used in shipping, rail and land 9 power generation becomes increasingly strict. E.g. IMO Tier III applicable to 10 sea-going vessels limits the NO x emission by 75% compared to IMO Tier II. 11Attaining these without sacrificing fuel consumption is a big challenge. This 12 paper reports on engine internal measures that can provide a viable alternative 13 to expensive (running costs) and bulky after-treatment. Exhaust Gas Recircu-

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Section: Introductionmentioning

confidence: 99%

Experimental study of NO reduction on a medium speed heavy duty diesel engine by the application of EGR (exhaust gas recirculation) and Miller timing

Verschaeren

Schaepdryver

Serruys

et al. 2014

Energy

113

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“…These sub-models were previously implemented by the authors in the framework of the KIVA-3V codes and they are fully described in [16][17][18]. Moreover, the customized KIVA-3V code has been already applied by authors to the analysis of some current production Diesel engines and the results of calculations was found in very good agreement with experiments, as reported in [18][19][20].…”

Section: The 3d-cfd Codementioning

confidence: 70%

Combustion analysis of a light duty diesel engine using oxygen-enriched and humidified combustion air

et al. 2019

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The present work presents the results of 3D CFD combustion simulations of a current production 4-cylinder turbocharged Diesel engine using oxygen-enriched and humidified combustion air. Enriched Air (EA) is supposed to be produced by desorption from water, exploiting the different Henry constants of N2 and O2. Simulation results show that EA permits to increase the engine thermal efficiency (up to 10%) and drastically reduces soot emissions but increases in-cylinder peak pressure and NOx emissions. Combustion air humidification helps to reduce NOx increment, without losing the advantage in terms of thermal efficiency and in soot reduction, even if NOx emissions cannot be reported to the base case values.

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“…Rinaldini et al [13] carried out an experimental and numerical study to assess the potential and the limits of Miller cycle in a four-cylinder diesel engine. A significant reduction in NOx emissions was achieved at high load with small fuel consumption penalty.…”

Section: /20/2015mentioning

confidence: 99%

Exploring the NOx Reduction Potential of Miller Cycle and EGR on a HD Diesel Engine Operating at Full Load

Guan¹,

Pedrozo²,

Zhao³

et al. 2018

SAE Technical Paper Series

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The reduction in nitrogen oxides (NOx) emissions from heavy-duty diesel engines requires the development of more advanced combustion and control technologies to minimize the total cost of ownership (TCO), which includes both the diesel fuel consumption and the aqueous urea solution used in the selective catalytic reduction (SCR) aftertreatment system. This drives an increased need for highly efficient and clean internal combustion engines. One promising combustion strategy that can curb NOx emissions with a low fuel consumption penalty is to simultaneously reduce the in-cylinder gas temperature and pressure. This can be achieved with Miller cycle and by lowering the in-cylinder oxygen concentration via exhaust gas recirculation (EGR). The combination of Miller cycle and EGR can enable a low TCO by minimizing both the diesel fuel and urea consumptions. In this work, Miller cycle with late intake valve closing (IVC) and EGR technology were investigated on a single cylinder common rail heavy-duty diesel engine at the high load operation of 24 bar net indicated mean effective pressure. The experiments were performed with a constant intake manifold pressure of 3 bar while optimizing the start of diesel injection to keep the peak in-cylinder pressure limit of 180 bar. The aqueous urea solution consumption in the SCR aftertreatment system was estimated to evaluate the effectiveness of the strategies in terms of TCO. The calculation was based on the engine-out NOx emissions and the Euro VI NOx limit. The results revealed that the use of the Miller cycle without EGR reduced NOx emissions by 35% and the net indicated efficiency by 4% when compared to the case with the baseline IVC at-178 crank angle degrees (CAD) after top dead center (ATDC). The introduction of 8%EGR decreased the levels of NOx by 54% while maintaining similar net indicated efficiency at the baseline IVC. The combination of Miller cycle with an IVC at-127 CAD ATDC and an EGR rate of 8% achieved the best trade-off between NOx and ISFC, decreasing the NOx levels by 57% and the fuel consumption by 1.6% compared to the baseline case. Soot emissions were maintained below the Euro VI limit of 0.01 g/kW h. Carbon monoxide emissions were maintained at low levels except for the combination of an IVC at-114 and an EGR rate of 8%. Unburned hydrocarbon emissions were slightly decreased with EGR and late IVCs likely due to relatively longer ignition delays and higher exhaust gas temperature. Overall, the analysis showed that the combination of Miller cycle with an IVC at-127 CAD ATDC and 8%EGR achieved the lowest total fluid consumption despite the reduction in net indicated thermal efficiency.

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Potential of the Miller cycle on a HSDI diesel automotive engine

Cited by 65 publications

References 28 publications

Experimental study of NO reduction on a medium speed heavy duty diesel engine by the application of EGR (exhaust gas recirculation) and Miller timing

Experimental study of NO reduction on a medium speed heavy duty diesel engine by the application of EGR (exhaust gas recirculation) and Miller timing

Combustion analysis of a light duty diesel engine using oxygen-enriched and humidified combustion air

Exploring the NOx Reduction Potential of Miller Cycle and EGR on a HD Diesel Engine Operating at Full Load

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