The document discusses fuel injection systems, including their objectives of improving power output, fuel efficiency, and emissions performance. It describes the main components of a fuel injector like the injector body and nozzle. Various injection schemes are covered such as single point injection, continuous injection, and direct injection. The advantages of fuel injection systems are better atomization and fuel control, while the disadvantages include higher costs and need for tuning. In conclusion, proper functioning of fuel injectors is important for engine performance.

1. Fuel Injection System
SurajKumar Gupta
(1204240054)

2. Contents
a. Introduction
b. Objectives
c. Injector
d. Functioning
e. Injection schemes
f. Advantages
g. Disadvantages
h. Conclusion
i. Bibliography

3. Introduction
Fuel injection
atomizes the fuel by
pumping it through a
small nozzle under high
pressure

4. Objectives
Power output
Fuel efficiency
Emissions performance
Acceptable to alternative fuels
Reliability
Drivability and smooth operation
Initial cost
Maintenance cost
Engine tuning

5. Injector
Electromechanic
al device
Controlled by
ECM
How long it stays
open determined
by:
Engine
temp
Engine
load
Throttle
position
O2 sensor
voltage

6. 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

7. Injectorsin operation

8. VariousInjectionSchemes
Single Point Injection (SPI)
Continuous Injection
Central Port Injection (CPI)
Multi Point Injection (MPI)
Direct Injection

9. 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

10. Tubes with
Poppet valves
are used Batch fire
Injects into
intake ports
40-60
psi
Sequential
Batched
Injection

11. Fuel is Injected into
the combustion
chamber
26000 psi
Injection

12. 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.

13. Disadvantages
It requires several peripheral
components which leads increased
basic cost.
Technology is more
complex.
Definite tuning required for every engine and its
component.

14. conclusion
Here I conclude my speech stating that proper functioning of
fuelinjector should be ensured for proper functioningof engine.
Though there are some disadvantages , Fuel Injection System are
used extensively thesedays.

15. Bibliography
• A course in internal combustion engine by M.L. Mathur
and 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