A comprehensive analysis of multiple injection strategies for improving diesel combustion process under cold-start conditions

Park, Hyunwook; Bae, Choongsik; Changhyun, Ha

doi:10.1016/j.fuel.2019.115762

Cited by 34 publications

(16 citation statements)

References 28 publications

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“…Furthermore, the following problems occur during the warm‐up phase and the high level of emission production 38‐42 : Cold intake manifold and cylinder walls cause improper conditions for the vaporization of the fuel. (less significant in contemporary fuel‐injected engines) Cold lubricant is more viscous, which causes more loss as a result of friction. Due to a lower fraction of fuel being vaporized, more fuel is being fed to the engine.…”

Section: Introductionmentioning

confidence: 99%

Energy and environmental enhancement of power generation units by means of zero‐flow coolant strategy

et al. 2021

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Summary Warm‐up period is considered as the most critical phase in the operation of any device that converts the energy of a fuel into heat, electricity, and other products, including power generation units since the system efficiency and environmental pollution levels are much worse than the normal operation in that phase. Considering this point, in this study, applying the zero‐flow coolant strategy to reduce the warm‐up period is suggested for power generation units and it is investigated in details. An internal combustion engine is selected as the case‐study and implementation of the method to enhance the performance of that from both energy and environmental aspects are studied comprehensively. As the results show, for the investigated engine, which has a capacity of 1.8 L, implementation of the method leads to 17% decrease in the warm‐up period. It is accompanied by 9.32% and 2.23% improvement in the amount of unburned hydrocarbon emission and fuel consumption. Moreover, based on the conducted discussion, despite other available methods to enhance systems that consume fuel, the method is so practical that it could be employed simply in an energy system without imposing a huge cost, which is taken into account as a significant advantage.

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Section: Introductionmentioning

confidence: 99%

Energy and environmental enhancement of power generation units by means of zero‐flow coolant strategy

et al. 2021

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“…Environmental pollution brings serious ecological problems (Matsuzawa et al 2001;Baumard et al 1998), and automobile exhaust pollution is one of the sources of serious environmental pollution, so it is urgent to reduce automobile emissions (Zhang et al 2021;Sun et al 2021;Lichtfouse et al 1997). Many countries have formulated strict emission standards to improve environmental quality (Qian et al 2019a(Qian et al , 2019bPark et al 2019). At present, some ways to reduce emission pollution, such as improving fuel, combustion mode and adding post-processor have been proposed (Zhong et al 2018(Zhong et al , 2016.…”

Section: Introductionmentioning

confidence: 99%

NO catalytic performance analysis of gasoline engine tapered variable cell density carrier catalytic converter

Zuo

Yang

Zhang

et al. 2021

Environ Sci Pollut Res

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Improving the flow field uniformity of catalytic converter can promote the catalytic conversion of NO to NO2. Firstly, the physical and mathematical models of improved catalytic converter are established, and its accuracy is verified by experiments. Then, the NO catalytic performance of standard and improved catalytic converters is compared, and the influences of structural parameters on its performance are investigated. The results showed that: (1) The gas uniformity, pressure drop and NO conversion rate of the improved catalytic converter are increased by 0.0643, 6.78% and 7.0% respectively. (2) As the cell density combination is 700 cpsi/600 cpsi, NO conversion rate reaches the highest, 73.7%, and the gas uniformity is 0.9821. (3) When the tapered height is 20 mm, NO conversion rate reaches the highest, 72.4%, the gas uniformity is 0.9744. (4) When the high cell density radius is 20 mm, NO conversion rate reaches the highest, 72.1%, the gas uniformity is 0.9783. (5) When the tapered end face radius is 20 mm, NO conversion rate reaches the highest, 72.0%, the gas uniformity is 0.9784. The results will provide a very important reference value for improving NO catalytic and reducing vehicle emission.

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Section: Introductionmentioning

confidence: 99%

“…6,24 Also, low ambient temperature leads to enhance incomplete combustion. 6,25,26 Fuel consumption also increases with the lower combustion efficiency and higher mechanical losses. 6 The reduction of cold start emissions in CI engines has become an increasingly important issue, because the fuel consumption and exhaust gas emissions associated with cold-start conditions are higher than those associated with warmed engine conditions.…”

Section: Introductionmentioning

confidence: 99%

“…3,4 Nowadays, CI engines have to face challenges including improved thermal efficiency and real driving emissions. 5,6 In fact, important efforts have been made in the recent years to improve the combustion, emissions, and performance of CI engine, mainly in warmed conditions. [7][8][9][10] Engines are mostly used under transient conditions and only a small proportion of daily driving schedules involve steady-state operation.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of temperature and altitude effects on the Global Energy Balance during WLTC

Payri

Martín

Arnau

et al. 2021

International Journal of Engine Research

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In this work, the Global Energy Balance (GEB) of a 1.6 L compression ignition engine is analyzed during WLTC using a combination of experimental measurements and simulations, by means of a Virtual Engine. The energy split considers all the relevant energy terms at two starting temperatures (20°C and 7°C) and two altitudes (0 and 1000 m). It is shown that reducing ambient temperature from 20°C to −7°C decreases brake efficiency by 1% and increases fuel consumption by 4%, mainly because of the higher friction due to the higher oil viscosity, while the effect of increasing altitude 1000 m decreases brake efficiency by 0.8% and increases fuel consumption by 2.5% in the WLTC mainly due to the change in pumping. In addition, GEB shows that ambient temperature is affecting exhaust enthalpy by 4.5%, heat rejection to coolant by 2%, and heat accumulated in the block by 2.5%, while altitude does not show any remarkable variations other than pumping and break power.

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A comprehensive analysis of multiple injection strategies for improving diesel combustion process under cold-start conditions

Cited by 34 publications

References 28 publications

Energy and environmental enhancement of power generation units by means of zero‐flow coolant strategy

Energy and environmental enhancement of power generation units by means of zero‐flow coolant strategy

NO catalytic performance analysis of gasoline engine tapered variable cell density carrier catalytic converter

Analysis of temperature and altitude effects on the Global Energy Balance during WLTC

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