Energy efficiency impact of EGR on organizing clean combustion in diesel engines

Divekar, Prasad; Chen, Xiang; Tjong, Jimi; Zheng, Ming

doi:10.1016/j.enconman.2016.01.042

Cited by 48 publications

(19 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Tadano et al [29] showed reductions up to 93% in NOX using SCR systems in a diesel engine. EGR systems are also very effective in reducing NOX emissions [32][33], but increases smoke emissions, which can be reduced by ethanol addition to the fuel [33][34][35].…”

Section: Fig 11 Variation Of Specific Oxides Of Nitrogen Emissions Wimentioning

confidence: 99%

Combustion, performance and emissions of a diesel power generator with direct injection of B7 and port injection of ethanol

Oliveira

Morais

Valente

et al. 2016

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

This work investigates a diesel engine operating with diesel oil containing 7% biodiesel (B7) and hydrous ethanol with concentrations varying from 5% to 30%. The experiments were conducted in a 49 kW diesel power generator, equipped with an electronic ethanol injection unit installed in the intake manifold and without any modifications in the diesel oil injection system. The results showed a decrease of in-cylinder pressure and net heat release rate with the use of ethanol at low loads and an increase at high loads, in comparison with B7. Increasing ethanol injection caused increased ignition delay and decreased combustion duration. Fuel conversion efficiency was raised up to 13% with the use of ethanol. The use of 30% ethanol in the fuel caused a reduction of carbon dioxide (CO2) emissions up to 12% and nitric oxide (NO) up to 53%. Carbon monoxide (CO), total hydrocarbons (THC) and oxides of nitrogen (NOX) emissions increased with ethanol addition. The replacement of 20% of diesel fuel by ethanol showed the lowest penalties on NOX emissions.

show abstract

Section: Fig 11 Variation Of Specific Oxides Of Nitrogen Emissions Wimentioning

confidence: 99%

Combustion, performance and emissions of a diesel power generator with direct injection of B7 and port injection of ethanol

Oliveira

Morais

Valente

et al. 2016

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…The use of EGR is limited by increased PM emissions and reduced engine thermal efficiency, which causes a NO X /PM trade-off [9,[14][15][16][22][23][24]. He et al [8] explain that the use of high EGR rates is possible with the delay of diesel injection, reducing engine efficiency losses, but with increasing soot emissions.…”

Section: Introductionmentioning

confidence: 99%

“…The application of this technique to spark ignition and compression ignition engines has been studied with regard to its effects on engine performance, inlet air temperature control, combustion control and dual-fuel operation [4][5][6][7][8][9][10][11][12]. The possibility of reducing NO x emissions with the use of EGR rate results from thermal, chemical and dilution effects [8,9,[13][14][15][16]. In the thermal effect, the high specific heat of exhaust carbon dioxide (CO 2 ) and water (H 2 O), compared to oxygen (O 2 ) and nitrogen (N 2 ) in the intake air, reduces combustion temperature.…”

Section: Introductionmentioning

confidence: 99%

Effects of EGR rate on performance and emissions of a diesel power generator fueled by B7

Serio

Oliveira

Sodré

2017

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…Figure 10 shows the set-point maps generated for the PID control. As discussed and suggested by both Arnold et al (10) and Diverak et al (34), due to the negative impact of the EGR gas on the performance and stability of the engine, EGR valve should only be opened within a restricted area of the set-points map. In this study, the EGR valve opens only when the following conditions are met, 1.…”

Section: Results and Discussion 51 Proposed Control Scheme Comparedmentioning

confidence: 99%

A novel fuzzy logic variable geometry turbocharger and exhaust gas recirculation control scheme for optimizing the performance and emissions of a diesel engine

Cheng

Dimitriou

Wang

et al. 2018

International Journal of Engine Research

View full text Add to dashboard Cite

Variable geometry turbocharger and exhaust gas recirculation valves are widely installed on diesel engines to allow optimized control of intake air mass flow and exhaust gas recirculation ratio. The positions of variable geometry turbocharger vanes and exhaust gas recirculation valve are predominantly regulated by dual-loop proportional–integral–derivative controllers to achieve predefined set-points of intake air pressure and exhaust gas recirculation mass flow. The set-points are determined by extensive mapping of the intake air pressure and exhaust gas recirculation mass flow against various engine speeds and loads concerning engine performance and emissions. However, due to the inherent nonlinearities of diesel engines and the strong interferences between variable geometry turbocharger and exhaust gas recirculation, an extensive map of gains for the P, I, and D terms of the proportional–integral–derivative controllers is required to achieve desired control performance. The present simulation study proposes a novel fuzzy logic control scheme to determine appropriate positions of variable geometry turbocharger vanes and exhaust gas recirculation valve in real-time. Once determined, the actual positions of the vanes and valve are regulated by two local proportional–integral–derivative controllers. The fuzzy logic control rules are derived based on an understanding of the interactions among the variable geometry turbocharger, exhaust gas recirculation, and diesel engine. The results obtained from an experimentally validated one-dimensional transient diesel engine model showed that the proposed fuzzy logic control scheme is capable of efficiently optimizing variable geometry turbocharger and exhaust gas recirculation positions under transient engine operating conditions in real-time. Compared to the baseline proportional–integral–derivative controllers approach, both engine’s efficiency and total turbo efficiency have been improved by the proposed fuzzy logic control scheme while NOx and soot emissions have been significantly reduced by 34% and 82%, respectively.

show abstract

Energy efficiency impact of EGR on organizing clean combustion in diesel engines

Cited by 48 publications

References 41 publications

Combustion, performance and emissions of a diesel power generator with direct injection of B7 and port injection of ethanol

Combustion, performance and emissions of a diesel power generator with direct injection of B7 and port injection of ethanol

Effects of EGR rate on performance and emissions of a diesel power generator fueled by B7

A novel fuzzy logic variable geometry turbocharger and exhaust gas recirculation control scheme for optimizing the performance and emissions of a diesel engine

Contact Info

Product

Resources

About