1. Third Generation Fuel Induction Systems for S.I. Engines
P M V Subbarao
Professor
Mechanical Engineering Department
Artificial Injection of Right and Metered amount of Fuel at Right Location…...

2. Need for Fuel Injection in SI Engine
One of the main factors to achieve near complete combustion and better engine performance is the generation of a homogenous mixture of air and fuel in the cylinder.
The most possibly fuel should be evaporated in the ports and mixed with the inlet air.
The less possibly fuel as a liquid layer should be formed at the port and the cylinder walls
The better solution is injection of fuel even in in the inlet port of gasoline (SI) vehicles using MPFI system.

3. Artificial Induction of Fuel
The fuel-induction systems for current (high percentage) spark-ignition engines inject the fuel.
There are both mechanical and electronically controlled injection systems.
Better volumetric efficiency
More uniform fuel distribution
More rapid response to changes in loading conditions
More precise control of the equivalence ratio.

4. Overview of Electronic Fuel Injection System

5. Anatomy of EFI
Solenoid Magnet

6. Force on the Rod Final Magnetic Energy of the field
Initial Magnetic Energy of the field
Change in energy

7. Standard Gasoline Injectors

8. The route to Reach the Goal
It is also important to know the time and condition with which the fuel should be sprayed in the port.
The process of forming mixture in gasoline fuel injection vehicles is initiated with;
the spray of fuel from injector and
accompanied with the process of mass and momentum transmission.
It is essential to recognize the structure and spray pattern.

9. The story of Mixture Formation & Fuel Spray

10. Gasoline Fuel Sprays in Port

11. Port Fuel Injection System

12. Control of Wall Wetting in Port Injection

13. Spray Formation
Spray formation is explained as Breakup Mechanism, described as:
Stretching of fuel ligament into sheets or streams.
Appearance of ripples and protuberances.
Formation of small ligaments or holes in sheets.
Collapse of ligaments or holes in sheets.
Further breakup due to vibration of droplets.
Agglomeration or shedding from large drops.