4/16/2021 0 Comments Fuel Injection System Ppt
The time lag between fuel injection and induction into the cylinder may cause misfire and significant increase in UBHC.Author tried to review gasoline direct injection (GDI) a new technology in the gasoline engine with the objective to motivate the researchers to work with this field.This paper reviews the benefits of direct injection in the gasoline engine in terms of fuel consumption and emission.The effect of stratified and homogeneous mode on the performance parameter along with combustion system (wall guided spray guided and air guided), its extend feasibility and complexity in the individual and combine mode of operation is reviewed in detail.
The review comes up with the need of optimization in mixture formation to reduce in-cylinder wall wetting, increase combustion stability, and extend up to which charge cooling occurs and feasibility of stratified mode operation in GDI engine. Author tried to review gasoline direct injection (GDI) a new technology in the gasoline e ngine with the objective to motivate the researchers to work with this field. This paper reviews the benefits of direct in jection in the gasoline engine in terms of fuel consumption and emission. The review comes up with the need of op timization in mixture formation to reduce in-cylinder wall wetting, increase combustion stability, and extend up to which charge cooling occurs and feasibility of stratified mode operation in GDI engine. Optical diagnostic and CFD are the tools wh ich can help in optimizing this complex system 2016 The Authors.Publis hed by Elsevier Ltd. Peer-review under responsibility ofthe organizing committee of ICAER 2015. The fuel conversion efficiency is the function of mixture form ation process i) internal ii) external iii) internal plus external. Peer-review under responsibility of the organizing committee of ICAER 2015. External mixture formation allows larger time for the mixture preparation hence it is independent of phase tr ansformation within cylinder, leads towards good fluid dynamic condition, simple and better contro l 1, 3, 14 in spite of these advantages Throttling and liquid fuel film formation in the inlet port and charge loss during valve overlap are still disadvantages of the PFI engine, even PFI engine is at its development peak. GDI engine does not have these limitations and during part load condition operates in unthrottled manner which significantly improves specific fuel consumption and emissions and permits for the leaner combustion. Char ge cooling occurs in early injecti on (homogeneous condition) benefits in terms of higher compression ratio, lower octane requirement and improvement in specific fuel consumption up to 30. Direct injection methods: T here are two ways of direct injection 1) direct injection of liquid fuel a nd 2) direct injection of premixture injection. Direct injection of liquid fuel: it is a high pressure fuel injec tion system in which liquid fuel is directly injected into the engine cylinder. The fuel injection pressure should be suffici ently higher than cylinder pressure in the range of 4Mpa- 15Mpa which is sufficient to produce well atomize spray. Direct injec tion of air fuel premixture: It is a low pressure injection system in which mixture is formed outside the cylinder by injecting fuel (Pressure range 0.6 Mpa) in the part of air (Pressure 0.55 MPa). The premixture is transforme d into combustion chamber by mechanical valve with mechanical cont rol or by solenoid with electronic c ontrol. Novel approaches towards GDI from PFI Mixture formation strategies make difference between PFI and GDI engine. In PFI engine fuel injected on the back of inlet valve when the valve is in closed position. Li quid film formation on the back of the inlet valve and fuel wall wetting in the intake port are the major problems in the PFI engine which Results in the disadvantages like metering error, fuel delivery delay.
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