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Potential of reactivity controlled compression ignition (RCCI) combustion coupled with variable valve timing (VVT) strategy for meeting Euro 6 emission regulations and high fuel efficiency in a heavy-duty diesel engine

Xu, Guangfu; Jia, Ming; Li, Yaopeng LU ; Chang, Yachao and Wang, Tianyou (2018) In Energy Conversion and Management 171. p.683-698
Abstract

As an effective strategy to control the combustion of advanced combustion modes, the application of variable valve timing (VVT) in reactivity controlled compression ignition (RCCI) combustion was investigated in this study. By coupling KIVA-3V code with genetic algorithm, the combustion of a heavy-duty engine with RCCI combustion combined with VVT strategy was optimized under a wide load range. At each load, six operating parameters including premix ratio (PR), intake valve closing (IVC) timing, start of injection, exhaust gas recirculation rate, intake pressure, and intake temperature were optimized to realize low-emission and high-efficiency combustion. The optimization results indicate that, at low load, high PR coupled with either... (More)

As an effective strategy to control the combustion of advanced combustion modes, the application of variable valve timing (VVT) in reactivity controlled compression ignition (RCCI) combustion was investigated in this study. By coupling KIVA-3V code with genetic algorithm, the combustion of a heavy-duty engine with RCCI combustion combined with VVT strategy was optimized under a wide load range. At each load, six operating parameters including premix ratio (PR), intake valve closing (IVC) timing, start of injection, exhaust gas recirculation rate, intake pressure, and intake temperature were optimized to realize low-emission and high-efficiency combustion. The optimization results indicate that, at low load, high PR coupled with either late IVC or base IVC can be utilized for the realization of high thermal efficiency. At mid load, the base IVC strategy is integrated with high PR, while the late IVC strategy is coupled with low PR. At high load, only the strategy with late IVC and low PR can be used. The strategy with higher PR and earlier IVC timing exhibits better engine performance on thermal efficiency and soot emissions, while the strategy with lower premix ratio and later IVC timing is superior in ringing intensity. By optimizing the RCCI combustion with the VVT strategy, the Euro 6 NOx limit can be met while maintaining ultra-low soot emissions at low and mid load. However, at least one aftertreatment device is required to further eliminate the NOx or soot emissions at high load. Under the whole load conditions, satisfactory fuel consumption can be obtained.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Euro 6 emission regulations, Fuel consumption, Reactivity controlled compression ignition (RCCI), Variable valve timing (VVT), Wide load range
in
Energy Conversion and Management
volume
171
pages
16 pages
publisher
Elsevier
external identifiers
  • scopus:85048520166
ISSN
0196-8904
DOI
10.1016/j.enconman.2018.06.034
language
English
LU publication?
yes
id
3eecf403-9227-48e0-9306-cc5f10369646
date added to LUP
2018-06-27 16:10:31
date last changed
2019-08-18 04:49:49
@article{3eecf403-9227-48e0-9306-cc5f10369646,
  abstract     = {<p>As an effective strategy to control the combustion of advanced combustion modes, the application of variable valve timing (VVT) in reactivity controlled compression ignition (RCCI) combustion was investigated in this study. By coupling KIVA-3V code with genetic algorithm, the combustion of a heavy-duty engine with RCCI combustion combined with VVT strategy was optimized under a wide load range. At each load, six operating parameters including premix ratio (PR), intake valve closing (IVC) timing, start of injection, exhaust gas recirculation rate, intake pressure, and intake temperature were optimized to realize low-emission and high-efficiency combustion. The optimization results indicate that, at low load, high PR coupled with either late IVC or base IVC can be utilized for the realization of high thermal efficiency. At mid load, the base IVC strategy is integrated with high PR, while the late IVC strategy is coupled with low PR. At high load, only the strategy with late IVC and low PR can be used. The strategy with higher PR and earlier IVC timing exhibits better engine performance on thermal efficiency and soot emissions, while the strategy with lower premix ratio and later IVC timing is superior in ringing intensity. By optimizing the RCCI combustion with the VVT strategy, the Euro 6 NO<sub>x</sub> limit can be met while maintaining ultra-low soot emissions at low and mid load. However, at least one aftertreatment device is required to further eliminate the NO<sub>x</sub> or soot emissions at high load. Under the whole load conditions, satisfactory fuel consumption can be obtained.</p>},
  author       = {Xu, Guangfu and Jia, Ming and Li, Yaopeng and Chang, Yachao and Wang, Tianyou},
  issn         = {0196-8904},
  keyword      = {Euro 6 emission regulations,Fuel consumption,Reactivity controlled compression ignition (RCCI),Variable valve timing (VVT),Wide load range},
  language     = {eng},
  month        = {09},
  pages        = {683--698},
  publisher    = {Elsevier},
  series       = {Energy Conversion and Management},
  title        = {Potential of reactivity controlled compression ignition (RCCI) combustion coupled with variable valve timing (VVT) strategy for meeting Euro 6 emission regulations and high fuel efficiency in a heavy-duty diesel engine},
  url          = {http://dx.doi.org/10.1016/j.enconman.2018.06.034},
  volume       = {171},
  year         = {2018},
}