Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel Injection

Takeda, Yoshinaka; Nakagome, Keiichi; Niimura, Keiichi

doi:10.4271/961163

Cited by 276 publications

(53 citation statements)

References 6 publications

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“…The current and emerging after-treatment technologies give encouraging results, but their cost and complexity threaten the competitiveness of the Diesel engine package. Conversely, over the past decade, research in Diesel homogeneous charge combustion has highlighted an alternative approach for significant engine out reductions of nitrogen oxides (NOx) and Particulate Matter (PM) emissions [1][2][3][4][5][6][7][8][9]. Importantly, it demonstrates the capability of simultaneously reducing NOx and PM emissions, thus potentially offering an extended use of Diesel engines without, or with greatly reduced, after-treatment requirements.…”

Section: Introductionmentioning

confidence: 99%

The effect of compression ratio on exhaust emissions from a PCCI diesel engine

Laguitton¹,

Crua²,

Cowell³

et al. 2007

Energy Conversion and Management

117

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A description of the development of a single cylinder test facility is presented, being based on a production 4-cylinder DI Diesel engine and designed to allow study of the emissions characteristics over a very wide range of operating conditions. The objective was to establish how engine out NO x emissions can be reduced to the estimated levels required by the next emissions target "Euro 6" and thus be able to apply the findings to the original 4-cylinder engine and minimise the requirement for currently immature NOx after treatment. It has been proposed that further reduction in compression ratio beyond current levels would be beneficial to engine out emissions and specific power, and could be facilitated by developments in cold start technology. The results of a study using this single cylinder facility to evaluate the effect of reducing compression ratio from 18.4 to 16.0 are presented. It was found that, although there was a small CO and HC penalty, either reducing the compression ratio or retarding the injection timing greatly reduced NOx and soot emissions when both premixed and diffusion-combustion phases were present. This effect was less significant when the combustion was solely premixed.

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Section: Introductionmentioning

confidence: 99%

The effect of compression ratio on exhaust emissions from a PCCI diesel engine

Laguitton¹,

Crua²,

Cowell³

et al. 2007

Energy Conversion and Management

117

View full text Add to dashboard Cite

show abstract

“…HCCI or PCCI premixed combustion concepts with diesel fuel confirmed how the combustion of a sufficiently premixed cylinder charge is effective for reducing simultaneously NOX and soot emissions [2][3][4][5]. However, the operating region of this strategy is restricted to low loads due to the strong propensity of auto-igniting the high cetane fuel along the compression stroke [6].…”

Section: Introductionmentioning

confidence: 99%

Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

2014

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Partially Premixed Combustion (PPC) of fuels in the gasoline octane range has proven to combine low NOX and soot emissions with high indicated efficiencies, while still retaining control over combustion phasing with the injection event. Previous research performed in four-stroke engines, has shown how the operating region where gasoline PPC concept can be successfully implemented is largely linked to the octane number of the fuel, making difficult to cover the entire load range with a fixed fuel.In this framework, 2-stroke engines arise as a promising solution to extend the load range of gasoline PPC concept, since it intrinsically provides equivalent torque response with only half the IMEP required in a 4-stroke cycle. Moreover, 2-stroke architecture provides high flexibility on the air management parameters to substantially control the cylinder conditions and affect the combustion environment, allowing proper combustion control even in low load conditions. An experimental investigation has been performed to evaluate the potential of the PPC concept for pollutant control, using a commercial gasoline with Research Octane Number of 95 in a newly-designed 2-stroke poppet valves automotive diesel engine. The experimental results confirm how it is possible to achieve stable gasoline PPC combustion at a low speed medium load point (1200 rpm, 5 bar IMEP); with good combustion stability (σIMEP below 3%), high combustion efficiency (over 98%), and low NOX and zero soot levels; thanks to the wide control of the cylinder gas temperature provided by the air management settings. Nevertheless, in agreement to the results reported in the literature, the indicated cycle efficiency attained at this low load operating condition is lower than the obtained in conventional diesel combustion conditions. Therefore, a dedicated optimization process of the engine hardware and engine settings is required to fully exploit the benefits of gasoline PPC concept in the investigated 2-stroke engine architecture.

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“…Compression-Ignition Homogeneous Charge CIHC [9], Premixed Lean Diesel Combustion PREDIC [10], Premixed Charge Compression Ignition PCCI [11], Activated Radical Combustion AR [12], Controlled Auto-Ignition CAI [13,14,15], Stratification Charged Compression Ignition SCCI [14,16], Homogeneous charge Intelligent Multiple Injection Combustion System HIMICS [17], Uniform Bulky Combustion System UNIBUS [18], or Modulated Kinetics MK [19]. Nevertheless, the worldwide accepted expression, which was formed by Thring [20], is HCCI.…”

Section: Introductionmentioning

confidence: 99%

Emission Characteristics for a HCCI Diesel Engine with EGR Using Split Injection Methodology

Lee¹,

Jung²,

Lee³

2017

Preprint

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Currently, for the serious air pollution and global warming effect caused by the substance released from the present vehicle, it is expected that the regulatory requirements for the emission will become more stringent. A new concept of the combustion technology that can reduce the NOx and PM related to combustion is urgently needed. To cope with such social demands, many developed countries are efforts to develop the environment friendly vehicle engine at the national lever in order to satisfy with strengthening emission control. As a main combustion technology among new combustion technology for the new generation engine, the homogenous charge compression engine (HCCI) is expanding its application range by employing multiple combustion mode, catalyst, direct fuel injection and partially premixed combustion.In this paper, a multi-injection method in order to apply the HCCI combustion method without mainly altering engine specifications and practicality by referring to the results of the HCCI engine was investigated. Applied with forced charging, exhaust gas recirculation (EGR) and compression ratio change, it was evaluated to the possibility of securing optimum fuel economy and emission reduction in the IMEP 0.8 MPa range.

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Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel Injection

Cited by 276 publications

References 6 publications

The effect of compression ratio on exhaust emissions from a PCCI diesel engine

The effect of compression ratio on exhaust emissions from a PCCI diesel engine

Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

Emission Characteristics for a HCCI Diesel Engine with EGR Using Split Injection Methodology

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