Comprehensive investigation on ballistic injection characteristics of GDI injector: A particular focus on injection pressure and fuel effects

Moon, Seoksu; Atac, Omer Faruk; Bae, Gyuhan; Park, Jeong Hwan

doi:10.1016/j.fuel.2022.127039

Cited by 5 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is important to underline that, for the injectors under study, the range at which the injected fuel mass experiences low repeatability (i.e. the ballistic operation range), changes depending on the injection pressure, as highlighted in Figure 4 and reported in Moon et al 23 In particular, the higher the pressure, the higher the minimum ET at which the injector does not operate in the ballistic region. For the highest tested injection pressure, fixed at 750 bar in this work, the transition from the ballistic operation takes place at almost 700 ms.…”

Section: Injector Hydraulic Characterizationmentioning

confidence: 82%

Section: Experimental Activitymentioning

confidence: 93%

“…In particular, the higher the injection pressure, the narrower is the hydraulic overlapping phase, since the needle experiences a greater closing force provided directly by the rail pressure. 19,23 The DT at which the maximum value of fuel injected can be found is the one at which the proximity of the current profiles leads to the maximum duration of needle opening (at 700 bar for example, as clearly visible in Figure 8, for very small dwell times, e.g. 50 μs, the partial overlap of the current profiles leads to a reduction of the injected mass from the peak value, approximately located at 200 μs).…”

Section: Experimental Activitymentioning

confidence: 99%

See 2 more Smart Citations

Experimental characterization of the injected mass variation in a high-pressure GDI injector operating with a multiple injection strategy

Viscione,

Brancaleoni,

Silvagni

et al. 2023

International Journal of Engine Research

View full text Add to dashboard Cite

Increasingly stringent limits to pollutants released by Internal Combustion Engines pushed the automotive research to develop technologies to reduce fuel consumption and emissions. Higher injection pressures are beneficial to accelerate the atomization phase, reducing the particulate matter and unburned hydrocarbon emissions. However, the spray protrusion inside the combustion chamber is enhanced and, consequently, the generation of a thick wall film, which tends to increase the latter emissions. Thus, multiple-injection strategies might be beneficial for both the atomization rate and the spray penetration, owing to a stratified charge inside the chamber. This paper investigates the effect of the adoption of multiple-injection strategies on the behaviour of a GDI injector operating in high injection pressure conditions. The resulting injected mass is influenced by electrical phenomena on the excitation circuit, which mainly depend on the relative time between the end of the first injection and the start of the following. Hence, the total amount of fuel injected with the multiple-injection pattern will differ from its nominal value. In this work, a specific experimental layout was developed to characterize the behaviour of the injector in different operating conditions and quantify the deviation between actual and nominal injected mass. The impact of the magnetized coils on the overall injected mass has been captured referring to the modification of the shape of the driving current profile with respect to the nominal one. Then, a correlation which considers the electric charge variation on the coils has been implemented to model the phenomenon and, consequently, to counterbalance the electro-magnetic effect on the injected mass. The resulting strategy successfully allowed to reduce the difference between the actual and target fuel mass from up to 30% to almost 5%, owing to its implementation on the injection control system to automatically correct the injection commands and compensate the fuel mass deviations.

show abstract

Section: Injector Hydraulic Characterizationmentioning

confidence: 82%

Section: Experimental Activitymentioning

confidence: 93%