Idle Operation with Low Intake Valve Lift in a Port Fuel Injected Engine

Clenci, Adrian; Bîzîiac, Adrian; Podevin, Pierre; Descombes, Georges; Deligant, Michaël; Niculescu, Rodica Mariana

doi:10.3390/en6062874

Cited by 12 publications

(14 citation statements)

References 18 publications

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“…It determines the interaction between incoming air flow and the fuel jets, as well as the actual space available for spray penetration, given by the position of the piston. Even though liquid velocity is high, air motion plays a significant role in this process, which also needs to be considered in view of ever wider application of variable valves actuation [13,14]. This is also important bearing in mind that injection needs to be advanced during boosted operation at high engine speed [15] in order to maintain the aforementioned compromise between intake air velocity and available spray penetration length [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fuel Injection Strategy on the Carbonaceous Structure Formation and Nanoparticle Emission in a DISI Engine Fuelled with Butanol

et al. 2017

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Within the context of ever wider expansion of direct injection in spark ignition engines, this investigation was aimed at improved understanding of the correlation between fuel injection strategy and emission of nanoparticles. Measurements performed on a wall guided engine allowed identifying the mechanisms involved in the formation of carbonaceous structures during combustion and their evolution in the exhaust line. In-cylinder pressure was recorded in combination with cycle-resolved flame imaging, gaseous emissions and particle size distribution. This complete characterization was performed at three injection phasing settings, with butanol and commercial gasoline. Optical accessibility from below the combustion chamber allowed visualization of diffusive flames induced by fuel deposits; these localized phenomena were correlated to observed changes in engine performance and pollutant species. With gasoline fueling, minor modifications were observed with respect to combustion parameters, when varying the start of injection. The alcohol, on the other hand, featured marked sensitivity to the fuel delivery strategy. Even though the start of injection was varied in a relatively narrow crank angle range during the intake stroke, significant differences were recorded, especially in the values of particle emissions. This was correlated to the fuel jet-wall interactions; the analysis of diffusive flames, their location and size confirmed the importance of liquid film formation in direct injection engines, especially at medium and high load.

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Section: Introductionmentioning

confidence: 99%

Effect of Fuel Injection Strategy on the Carbonaceous Structure Formation and Nanoparticle Emission in a DISI Engine Fuelled with Butanol

et al. 2017

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“…Our studies revealed that the ability to control maximum intake valve lift does indeed offer the ability to control intake air mass, but also has the added benefit that it improves the fuel-air mixing process thanks to an increased turbulence, caused by the increased intake flow velocity. This is particularly important at idle and low part loads when low maximum lifts are to be used for improving the fuel economy or for achieving the required power [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Influence of Masks Flow on Intake Valve of Gas and Oil Fuel Engine Based Simulation

Semin

Satriawansyah²,

Cahyono

et al. 2018

IJMEIR

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Turbulent flow in the combustion chamber affects the combustion process which also affects the engine performance. The turbulent flow intensity can increase the duration of combustion, but too much turbulent turbulent flow leads to a tap. In addition, turbulent flow also contributes to the gas-water mixing process. There are two types of turbulent flow that occur inside the machine, which is a current vortex and a falling current. The current whirl is better known as the swirl flow and the falling current is better known as the tumble flow. The fluid flow in the combustion chamber can be adjusted by optimizing the engine components and developing the engine design. A review has been made of the vortex and Tumble flow on a luminous spark machine and its effect on turbulence and fire propagation. From several journals available to create tumble and swirl streams in the combustion chamber, they use modifications to the intake valve by adding vin to create a swirl stream and adding a mask to create a tumble stream. to know the experiment was successful or not, first modeling and then perform simulation using CFD Ansys Fluent. for the variables choose 3mask, 4mask, and 5mask (for addition of mask) which later dilih air flow formed by the addition of mask.

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“…Changes in the in-cylinder flow field are created by changes in the shape of manifold, valve timing, and type of valve motion. Strategies for optimizing inlet and exhaust valve timings and some of developments in the application of VVT to diesel or gasoline engines can be obtained in some researches [2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, negative work decreased by increasing the valve lift. Adrian Clenci et al [5] studied experimentally the effect of low-lift idle operation in a PFI engine on fuel consumption and cyclic variability. They showed that fuel economy and cyclic dispersion improves by using the low-intake valve lift.…”

Section: Introductionmentioning

confidence: 99%

Reduction of pollutant emissions by developing a variable valve timing system in a direct injection diesel engine using computational fluid dynamics modeling

Ashkezari

Nezhad

Farahat

2016

Env Prog and Sustain Energy

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In this work, the fluid flow in a direct injection compression ignition engine and its effects on performance and pollutant emissions are studied by using computational fluid dynamics simulation through developing of variable valve timing system by combination of the optimum valve lifting and late inlet valve closing (LIVC) strategies. For this purpose, an improved version of ECFM‐3Z combustion model coupled with advanced models for NOx and soot formation was used to predict and simulate the combustion characteristics. First, the calculated in‐cylinder pressure, heat‐release rate, soot, and NOx were compared with experimental data and good agreement was obtained. To improve the performance and reduce the emission, various angles of LIVC and different types of valve lifting were compared with those of engine basic mode, and then optimum inlet valve closing (IVC) angle and optimum valve lift were determined. Results showed that in constant opening duration of the inlet valve, the volumetric efficiency increases by increasing the valve lift. In addition, the 25% increase of valve lift relative to basic mode along with optimized IVC angle of 70° crack angle after bottom dead center improves volumetric efficiency and brake power, and reduces considerably soot, NOx, and brake‐specific fuel consumption, while CO emission is increased slightly. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1430–1440, 2016

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Idle Operation with Low Intake Valve Lift in a Port Fuel Injected Engine

Cited by 12 publications

References 18 publications

Effect of Fuel Injection Strategy on the Carbonaceous Structure Formation and Nanoparticle Emission in a DISI Engine Fuelled with Butanol

Effect of Fuel Injection Strategy on the Carbonaceous Structure Formation and Nanoparticle Emission in a DISI Engine Fuelled with Butanol

Analysis of Influence of Masks Flow on Intake Valve of Gas and Oil Fuel Engine Based Simulation

Reduction of pollutant emissions by developing a variable valve timing system in a direct injection diesel engine using computational fluid dynamics modeling

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