Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature

Akihama, Kazuhiro; Takatori, Yoshiki; Inagaki, Kenji; Sasaki, Shinya; Dean, Anthony M.

doi:10.4271/2001-01-0655

Cited by 742 publications

(346 citation statements)

References 12 publications

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“…Combustion design in ĭ-T phase space with regions of soot, NO x and the desirable path [79] In order to obtain smokeless rich diesel combustion, it is necessary to use a large amount of cooled EGR. Since, by lowering the combustion temperature with the use of EGR, it is possible to control smoke and NO x at a significantly low level not only under stoichiometric optimal condition but also in a rich fuel condition.…”

Section: Figure 28mentioning

confidence: 99%

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Investigation of Cluster-Nozzle Concepts for Direct Injection Diesel Engines

Won

Peters

2009

Atomiz Spr

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Section: Figure 28mentioning

confidence: 99%

“…Some of the remaining fuel components which have low boiling temperatures are emitted as HC. And the other remaining components which have higher boiling temperatures form part of SOF (Soluble Organic Fraction) [79].…”

Section: Figure 28mentioning

confidence: 99%

Investigation of Cluster-Nozzle Concepts for Direct Injection Diesel Engines

Won

Peters

2009

Atomiz Spr

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“…Longer fuel air mixing progress and lower combustion temperatures due to high EGR are beneficial for simultaneously reducing NO x and smoke [12,13], However, considerable penalties of these technologies still exist in the current situation, such as the deterioration of combustion stability and engine performance due to low oxygen in the Energies 2017, 10, 1888 2 of 13 engine cylinder, and more cooling loss of high EGR [14][15][16][17]. Fortunately, the penalties caused by high EGR can be solved by in-cylinder EGR stratification, which modulate the combustion temperature and oxygen distribution to reduce NO x and smoke emissions that are formed under high temperature and a poor oxygen environment [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Numeric Investigation of Gas Distribution in the Intake Manifold and Intake Ports of a Multi-Cylinder Diesel Engine Refined for Exhaust Gas Stratification

Shen

Cui

et al. 2017

Energies

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Abstract:In-cylinder exhaust gas recirculation (EGR) stratification, generally achieved by supplying EGR asymmetrically into intake ports on a four-valve diesel engine, is sensitive to trapped exhaust gas in the intake manifold and intake ports that is caused by the continuous supply of EGR during the valve-close periods of the intake valves. The subject of this study is to evaluate the distribution of trapped exhaust gas in the diesel intake system using commercial Star-CD software (version 4.22.018). Numeric simulations of the intake flow of fresh air and recycled exhaust in the diesel intake system were initialized following previous experiments that were conducted on a reformed six-cylinder diesel engine by supplying CO 2 instead of EGR to the tangential intake port alone to establish CO 2 stratification in the first cylinder. The distributions of the intake CO 2 in the intake manifold and intake ports under the conditions of 1330 r/min and 50% load with different mass flow rates of CO 2 are discussed. This indicates that CO 2 supplied to one intake port alone would escape to another intake port, which not only weakens the CO 2 stratification by diminishing the mass fraction disparity of the CO 2 between the two intake ports of cylinder 1, but also influences the total mass of CO 2 in the cylinder. There is 4% CO 2 by mass fraction in the intake port without CO 2 supply under the condition that the CO 2 mass flow rate is 5 kg/h during the intake process, and 10% CO 2 under the condition of 50 kg/h.

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“…Although significant improvements have been made over the past years, there are still many challenges to address in order to meet the future emissions regulations. The introduction of sophisticated alternative combustion modes such as homogeneous charge compression ignition (HCCI) and low temperature combustion (LTC) a offer a great potential to reduce the engine emissions levels (see Akihama et al [2001] Alriksson and Denbrantt [2006] Ryan and Matheaus [2003]). However, these new modes require different fueling strategies and in-cylinder conditions, thus creating the need for more complex, reliable and precise control systems and technologies.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Air Fraction and Low-Pressure EGR Mass Flow Rate Estimation for Diesel Engines

Castillo

Witrant

Talon

et al. 2013

IFAC Proceedings Volumes

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This paper describes a low-pressure exhaust gas recirculation (LP-EGR) mass flow rate estimation method and a robust air mass fraction observer for a Diesel engine with dualloop EGR system. Both observers operate simultaneously eliminating the need for pressure measurement upstream the LP-EGR valve. A sliding mode observer is designed to estimate the LP-EGR mass flow rate using the standard sensors available in commercial Diesel engines. A robust linear parameter varying Kalman filter is designed for the air mass fraction estimation. The convergence and robustness of the observers are ensured by means of Lyapunov stability and a linear matrix inequality (LMI) framework for the sliding mode observer and robust Kalman filter, respectively. The observers are validated with a Motor Vehicle Emission Group (NMVEG) cycle using an engine model validated on an experimental benchmark as a reference.

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Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature

Cited by 742 publications

References 12 publications

Investigation of Cluster-Nozzle Concepts for Direct Injection Diesel Engines

Investigation of Cluster-Nozzle Concepts for Direct Injection Diesel Engines

Numeric Investigation of Gas Distribution in the Intake Manifold and Intake Ports of a Multi-Cylinder Diesel Engine Refined for Exhaust Gas Stratification

Simultaneous Air Fraction and Low-Pressure EGR Mass Flow Rate Estimation for Diesel Engines

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