New Combustion Concept for Ultra-Clean and High-Efficiency Small DI Diesel Engines

Kimura, Shuji; Aoki, Osamu; Ogawa, Hiroshi; Muranaka, Shigeo; Enomoto, Yoshiteru

doi:10.4271/1999-01-3681

Cited by 461 publications

(161 citation statements)

References 3 publications

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“…Compared to HCCI, PCCI offers lower NOx and soot reductions, but it does not exhibit the higher HC, CO, noise emissions, and the very tight requirements for homogeneity and leanness. PCCI is a single-stage combustion process closer to the premixed phase of conventional Diesel combustion, than the low and high temperature oxidations seen with HCCI [11]. PCCI is an approach generally more adapted to Diesel-fuelled applications as it does not rely on early injection timings when the piston is low in the cylinder and is therefore less prone to wall wetting with the inevitable high increases in HC and CO emissions.…”

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

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“…Sunyoup Lee *1) ․Jae Hoon Chang 1) ․Yonggyu Lee 1) ․Seungmook Oh 1) ․Yongrae Kim 1) ․Duksang Kim Table 1 과 같다. …”

Section: Effect Of Intake Pressure On Emissions and Performance In Lounclassified

Effect of Intake Pressure on Emissions and Performance in Low Temperature Combustion Operation of a Diesel Engine

Lee¹,

Chang²,

Lee³

et al. 2012

Transactions of the Korean Society of Automotive Engineers

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: One of the effective ways to reduce both NOx and PM at the same time in a diesel CI engine is to operate the engine in low temperature combustion (LTC) regimes. In general, two strategies are used to realize the LTC operation-dilution controlled LTC and late injection LTC -and in this study, the former approach was used. In the dilution controlled regime, LTC is achieved by supplying a large amount of EGR to the cylinder. The significant EGR gas increases the heat capacity of in-cylinder charge mixture while decreasing oxygen concentration of the charge, activating low temperature oxidation reaction and lowering PM and NOx emissions. However, use of high EGR levels also deteriorates combustion efficiency and engine power output. Therefore, it is widely considered to use increased intake pressure as a way to resolve this issue. In this study, the effects of intake pressure variations on performance and emission characteristics of a single cylinder diesel engine operated in LTC regimes were examined. LTC operation was achieved in less than 8% O2 concentration and thus a simultaneous reduction of both PM and NOx emission was confirmed. As intake pressure increased, combustion efficiency was improved so that THC and CO emissions were decreased. A shift of the peak Soot location was also observed to lower O2 concentration while NOx levels were kept nearly zero. In addition, an elevation of intake pressure enhanced engine power output as well as indicated thermal efficiency in LTC regimes. All these results suggested that LTC operation range can be extended and emissions can be further reduced by adjusting intake pressure.

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“…This strategy was implemented by Nissan under the name of Modulated Kinetics (MK) [8,9] and also by Lund University [10]. In both cases, simultaneous reductions in NOX and soot emissions were observed for medium-to-high load points.…”

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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New Combustion Concept for Ultra-Clean and High-Efficiency Small DI Diesel Engines

Cited by 461 publications

References 3 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

Effect of Intake Pressure on Emissions and Performance in Low Temperature Combustion Operation of a Diesel Engine

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

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