Investigation and Comparison of Residual Gas Enhanced HCCI using Trapping (NVO HCCI) or Rebreathing of Residual Gases

Partially premixed combustion (PPC) is a combustion concept with similarities to both Diesel and Homogeneous Charge Compression Ignition (HCCI) combustion. It provides a combustion mode with better controllability than HCCI without increasing the emissions of nitrogen oxides and soot to the level of traditional Diesel engines. The model described in this paper aims to describe the main features of Diesel PPC combustion within the closed part of an engine cycle. It is a single-zone model including heat losses to the cylinder walls as well as fuel evaporation losses. The simulation framework used allows optimization problems to be formulated based on the model equations. The overarching goal of this modeling is to be able to use the model explicitly for optimization.

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“…Additional engine specifications are listed in Table II. For further details on the engine and the control and data acquisition system, see [24].…”

Section: Methodsmentioning

confidence: 99%

Single-zone Diesel PPC modeling for control

Widd

Tunestål

Åkesson

et al. 2012

2012 American Control Conference (ACC)

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“…Studies have been completed on the use of internal exhaust gas retention for gasoline PPC engines. [20][21][22] These investigators compared the rebreathing valve strategy with the use of NVO (with and without fuel injection). They found lower heat losses with the rebreathing strategy, but combustion stability was weaker.…”

Section: Examples Of Previous Workmentioning

confidence: 99%

A thermodynamic comparison of external and internal exhaust gas dilution for high-efficiency internal combustion engines

Caton

2015

International Journal of Engine Research

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The use of exhaust gases for creating dilute mixtures for internal combustion engines has been shown to play an important role for the development of high-efficiency engines. These exhaust gases may be recirculated with external piping, or they may be retained in the cylinder by altering the valve timings. A thermodynamic cycle simulation was used to determine the thermodynamic advantages and disadvantages of external and internal methods of providing the exhaust gases for an automotive engine at constant load and speed. For the external exhaust gas recirculation, four (4) levels of cooling were examined, and for the internal exhaust gas recirculation, the use of negative valve overlap and delayed exhaust valve closing were assessed. A measure of the total amount of recirculated and retained exhaust gases is the burned gas percentage. In general, the thermal efficiencies decreased for most of these methods as the burned gas percentage increased. These decreases were due to increased cylinder heat transfer (in spite of the decreases in the gas temperatures) which was due to increases in the convective heat transfer coefficient. For the highly cooled external exhaust gas recirculation configuration, a slight increase in the thermal efficiencies was obtained, but this level of cooling might not be practical.

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“…In the exhaust rebreathing strategy, the exhaust valve opens again while the intake valve is opened so that the exhaust gases flow back to the cylinder. Borgqvist et al 7 showed that a rebreathing HCCI engine can achieve higher thermal efficiency than a NVO HCCI engine. In addition, Babajimopoulos et al 8 reported that the exhaust rebreathing strategy leads to more homogeneous mixtures than the NVO strategy.…”

Section: Introductionmentioning

confidence: 99%

Control-oriented modeling of the gas exchange process in rebreathing homogeneous charge compression ignition engines

Takeshita

Yamasaki

Muto

et al. 2021

International Journal of Engine Research

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The purpose of this study is to develop a model for the gas exchange process in a rebreathing homogeneous charge compression ignition (HCCI) engine. HCCI engines are attracting significant attention due to their low emissions and high efficiency. To design the control system of an HCCI engine, it is necessary to develop a control-oriented engine model. The developed model lowers its computational load by combining two types of models. The model consists of a discrete model for the exhaust process (the first half of the gas exchange process) and a continuous model with a variable calculation step size for the rebreathing process (the latter half of the gas exchange process). Also, the constructed model maintained its prediction accuracy, as the pressure pulsation in the exhaust port was modeled, and an unsteady flow equation was used. It was confirmed that the model developed for the gas exchange process calculated in about half time of one cycle and reproduced the results of 1D engine simulation software with a maximum error of about 10% in the in-cylinder pressure, temperature, and trapped mass.

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Investigation and Comparison of Residual Gas Enhanced HCCI using Trapping (NVO HCCI) or Rebreathing of Residual Gases

Cited by 23 publications

References 23 publications

Single-zone Diesel PPC modeling for control

Single-zone Diesel PPC modeling for control

A thermodynamic comparison of external and internal exhaust gas dilution for high-efficiency internal combustion engines

Control-oriented modeling of the gas exchange process in rebreathing homogeneous charge compression ignition engines

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