Sensitivity Analysis of Partially Premixed Combustion (PPC) for Control Purposes

Yin, Lianhao; Ingesson, Gabriel; Shamun, Sam; Tunestål, Per; Johansson, Bengt

doi:10.4271/2015-01-0884

Cited by 19 publications

(13 citation statements)

References 12 publications

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“…The definition of combustion controllability ( ) is given in Eq. 5[31], which is the derivative of CA50 ( ) with respect to a change in injection timing ( ) and it can be used as an indicator to evaluate whether a low reactivity fuel can be practically implemented [13,31].…”

Section: Test Methodsmentioning

confidence: 99%

“…Secondly, the pressure rise rate is high at medium and high loads [9,11,12]; Therefore, the gasoline PPC load range has been shown to be limited [3]. Thirdly, the combustion process is very sensitive to the boundary conditions, such as intake temperature, start of injection (SOI), EGR and so on [13]. Lastly, higher injection pressure of gasoline cannot be obtained by the commercial common rail high pressure injection system at the moment due to the lower viscosity of gasoline; therefore, the injection and combustion can hardly be separated at high load, which results in higher soot emission [5,14].To solve these challenges in gasoline PPC, gasoline fuel property optimizations by blending some high cetane number fuel and oxygenated fuel are widely investigated as potential methods to achieve PPC operation in practical engine.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on partially premixed combustion fueled with gasoline and PODE blends in a multi-cylinder heavy-duty diesel engine

Liu

Shang

Wang

et al. 2017

Fuel

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Gasoline partially premixed combustion (PPC) has been reported as an advancing concept for high efficient and clean combustion, while there still remains some obstacles. In this study, polyoxymethylene dimethyl ethers (PODE), which has superior properties of high oxygen content, high cetane number and no CC bond, is employed as an additive to optimize the properties of gasoline and solve the problems faced in gasoline PPC. The effects of gasoline/PODE blends with PODE volume blending ratio of 0, 10% and 20% on combustion and emission have been investigated from low to high loads in a multi-cylinder heavy-duty diesel engine. The experimental results show that the soot emission can be maximally reduced by 79% and 94% at high load when fueling PODE 10 and PODE20, respectively. The NOx-soot trade off relationship can be dramatically improved without penalty of fuel economy by fueling gasoline/PODE blends. The raw NOx and soot emissions can meet Euro V standards at high load and Euro VI standards at medium load by fueling both PODE10 and PODE20. Furthermore, the pressure rise rate can be maximally reduced by 24% and 47% when fueling PODE10 and PODE20. At medium load, the combustion controllability and sensitivity can be improved by gasoline/PODE blends. At low load, the COV IMEP can be reduced to 2.7% by fueling PODE20 which means a stable combustion can be obtained. Furthermore, the combustion efficiency can be dramatically improved from 85.1% to 99.6% by fueling PODE20, which leads to lower HC and CO emissions. Overall, PODE shows great advantage in solving the obstacles faced in gasoline PPC.

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Section: Test Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on partially premixed combustion fueled with gasoline and PODE blends in a multi-cylinder heavy-duty diesel engine

Liu

Shang

Wang

et al. 2017

Fuel

View full text Add to dashboard Cite

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“…[2][3][4][5][6] Control of premixing is necessary to implement PPC combustion strategies particularly in transient mode and to improve the emission formation over the full load range. [5][6][7] The amount of premixing can be controlled in various ways, for instance by tuning the injection timing.…”

Section: Introductionmentioning

confidence: 99%

Combustion stratification study of partially premixed combustion using Fourier transform analysis of OH* chemiluminescence images

Najafabadi

Somers

Johansson

et al. 2017

International Journal of Engine Research

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A relatively high level of stratification (qualitatively: lack of homogeneity) is one of the main advantages of partially premixed combustion over the homogeneous charge compression ignition concept. Stratification can smooth the heat release rate and improve the controllability of combustion. In order to compare stratification levels of different partially premixed combustion strategies or other combustion concepts, an objective and meaningful definition of ''stratification level'' is required. Such a definition is currently lacking; qualitative/quantitative definitions in the literature cannot properly distinguish various levels of stratification. The main purpose of this study is to objectively define combustion stratification (not to be confused with fuel stratification) based on high-speed OH* chemiluminescence imaging, which is assumed to provide spatial information regarding heat release. Stratification essentially being equivalent to spatial structure, we base our definition on two-dimensional Fourier transforms of photographs of OH* chemiluminescence. A light-duty optical diesel engine has been used to perform the OH* bandpass imaging on. Four experimental points are evaluated, with injection timings in the homogeneous regime as well as in the stratified partially premixed combustion regime. Two-dimensional Fourier transforms translate these chemiluminescence images into a range of spatial frequencies. The frequency information is used to define combustion stratification, using a novel normalization procedure. The results indicate that this new definition, based on Fourier analysis of OH* bandpass images, overcomes the drawbacks of previous definitions used in the literature and is a promising method to compare the level of combustion stratification between different experiments.

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“…Advanced combustion modes like homogeneous charge compression ignition (HCCI) (Strandh et al, 2004;Blom et al, 2008;Bengtsson et al, 2007a) and partially premixed combustion (PPC) are sensitive to inlet conditions (Yin et al, 2015). HCCI combustion is driven by chemical kinetics, the ignition is controlled by the temperature, pressure and composition at the end of the compression stroke, the intake temperature can be adjusted to achieve the desired ignition timing (Sjöberg and Dec, 2004;Bengtsson et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Partially premixed combustion multi-cylinder engine cycle-to-cycle-oriented temperature estimation and control

Yin

Ingesson

Tunestål

et al. 2017

IJPT

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Advanced combustion concepts like partially premixed combustion (PPC) are sensitive to inlet gas conditions especially inlet temperature. To estimate the combustion parameters like ignition delay on a cycle-to-cycle basis, both complementary filter and extended Kalman filter were designed to estimate the inlet temperature, and the ignition delay was calculated with properly estimated temperature. A two valve fast thermal management system was used to control the inlet temperature, and a PI controller with the lambda tuning method was used. The estimation and control algorithm were verified on a six-cylinder heavy duty engine.

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Sensitivity Analysis of Partially Premixed Combustion (PPC) for Control Purposes

Cited by 19 publications

References 12 publications

Investigation on partially premixed combustion fueled with gasoline and PODE blends in a multi-cylinder heavy-duty diesel engine

Investigation on partially premixed combustion fueled with gasoline and PODE blends in a multi-cylinder heavy-duty diesel engine

Combustion stratification study of partially premixed combustion using Fourier transform analysis of OH* chemiluminescence images

Partially premixed combustion multi-cylinder engine cycle-to-cycle-oriented temperature estimation and control

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