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suraj-gupta
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Contents
a. Introduction
b. Objectives
c. Injector
d. Functioning
e. Injection schemes
f. Advantages
g. Disadvantages
h. Conclusion
i. Bibliography
Introduction
Fuel injectionatomizes the fuel by pumping it through a small nozzle under high pressure
Objectives
Power output
Fuel efficiency
Emissions performance
Acceptable to alternative fuels
Reliability
Drivability and smooth operation
Initial cost
Maintenance cost
Engine tuning
Injector
Electromechanical device
Controlled by ECM
How long it stays open determined
by:
Engine temp
Engine load
Throttle position
O2 sensor voltage
Functioning
1. Leak off
2. Pressure adjusting shim
3. Pressure spring
4. Injector body
5. High pressure fuel supply
6. Pressure pin
7. Needle valve
8. nozzle retaining nut
9. Nozzle
Various Injection Schemes
Single Point Injection (SPI)
Continuous InjectionCentral Port Injection (CPI)
Multi Point Injection (MPI)
Direct Injection
Injection
Injects Fuel at throttle
body
Fuel Pressure-10-15 psi
It was used in 1980s
Flows at all times
Mainly used in aircraft engine
Tubes with Poppet valves
are used Batch fire
Injects into intake ports
40-60 psi
Sequential Batched
Injection
Advantages
It requires little regular maintenance.
Very good atomization of fuel by injection nozzle. The engine's overall power
output improves.
It eliminates the risk of carburettor icing.
Disadvantages
It requires several peripheralcomponents which leads increasedbasic cost.
Technology is morecomplex.
Definite tuning required for every engine and itscomponent.
conclusion
Here I conclude my speech stating that proper functioning offuel injector should be ensured for proper functioning of engine.
Though there are some disadvantages , Fuel Injection System areused extensively these days.
Bibliography
• A course in internal combustion engine by M.L. Mathurand R.P. Sharma.
• Internal combustion engine by V. Ganesan.
• Internal combustion engine fundamentals by J.B. Heywood.
• http://www.wikipedia.org
• http:// www.sae.org
• http:// www.ecollege.com
• http:// www.engineeringexplained.com
• http://www.brighthubengineering.com
• http://www.howstuffworks.com