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1. BY:
MR.SHUBHAM.S.SORATE

2. INTRODUCTION
Transition of Fuel Supply System
Carburetor Port Injection
(MPFI)
Direct Injection
(GDI)

3. ADVANTAGES OF FUEL INJECTION OVER CARBURETOR
☼ Fuel injection has no choke, but sprays atomized fuel directly into the
engine.
☼ Electronic fuel injection also integrates more easily with computerized
engine control systems.
☼ Multi port fuel injection delivers a more evenly distributed mixture of
air and fuel to each of the engine's cylinders.
☼ Sequential fuel injection improves power and reduces emissions.

4. Petrol injection system
Gasoline direct injection
(GDI)
Indirect injection
( manifold injection)
Single point injection Multi point fuel injection
(MPFI)
Throttle injection Port injection
Throttle injection Port injection
TYPES OF PETROL INJECTION
SYSTEM

5.  In indirect fuel is injected into the air stream before
entering the combustion chamber.
 And in direct injection system fuel is injected directly
inside the combustion chamber.
Fuel injector
Indirect injection Direct injection
Combustion
Chamber
Inlet valve

6. Single Point Injection system
 The earliest & simplest type of fuel injection, single
point simply replaces the carburetor with one or two
fuel injector nozzles in the throttle body, which is the
throat of the engine’s air intake manifold.
 Single point injection system meters fuel better than a
carburetor and is less expensive and easier to service.

7. Throttle Injection
 The indirect injection can be classified as single point
injection and multi point fuel injection.
 The single point injection also called Throttle
injection in which fuel is injected at one place in
throttle body, and the mixture supply to different
cylinders as shown in fig…

9. Port injection
 In case of Port injection also called multi point
fuel injection, air sucks through throttle body, and
fuel is injected near inlet valve of every cylinder as
shown in fig….

11. Multi Point Fuel Injection System
(MPFI)
 MPFI system is widely used in petrol engine in place of
carburetor.
 Purpose of MPFI is supply proper A/F ratio to each
cylinder of engine.
 Fuel tank > Pump > High pressure petrol > Distributor
> Fuel injector > Cylinder
 Now a days MPFI system control by Electric Control
Module (ECM).
 Ecm receives signal from different sensors.
 ECM receives signal and send to the solanoid operated
fuel injector to meter and inject right amount of fuel at
right time.

12. There are different type of sensors in MPFI system.
1. Inlet manifold pressure sensor
2. Air flow sensor
3. Engine speed sensor
4. Throttle position sensor
5. Coolant temperature sensor
6. Inlet air temperature sensor
7. Knock sensor
8. Exhaust gas sensor

13. Direct injection (GDI)
 These systems inject the fuel directly into the combustion
chamber, either during the intake stroke or during the
compression stroke.
 There are two basic type of GDI, either injection of gasoline
alone, or a duel injection of gasoline and air together.
 Injection of fuel alone is usually done during the
compression stroke and is somewhat similar to fuel
injection in CI engine. Because of the very short time
available for vaporization and mixing with air, very fine
droplets of fuel are required, as are high turbulence and
bulk mass motion within the combustion chamber

14.  Injector pressure must be higher than that require for
port injection.
 This is because of the higher pressure into which the
fuel is being injected, and because of the requirement
for finer droplets of fuel.
 Pressure required for fuel injection is above 40 to 65
bar.
 Modern gasoline engine may utilized Direct injection
using electric control.

15. Working of fuel injection in si engine

16. 3.350Fuel Pressure (MPa)
Port InjectionIn-Cylinder Direct InjectionFuel System
StandardUpright StraightIntake Port
Flat top PistonCurved Top PistonCombustion Chamber
10.512.0Compression Ratio
Intake: 2, Exhaust: 2Number of Valves
IL-4Number of Cylinders
1834Displacement
81.0 x 89.0Bore x Stroke (mm)
Conventional MPFIGDIITEM
COMPARISON

17. Fuel injection in two wheelers
1.It uses advanced sensors and actuators
to calculate and deliver the optimum
amount of fuel to the engine –
enhancing both performance and
mileage.
2. more responsive leading to quick
initial pickup and delivering smooth
passing acceleration.
3. It achieves a 14% improvement* in
fuel economy.
4. its intake/exhaust valve layout is
designed to best match the
hemispherical combustion chamber. In
combination with the optimized intake
and exhaust port shapes, this design
increases combustion speed and helps
achieve excellent combustion
efficiency. The new engine further
improves fuel efficiency and the feeling
of acceleration while retaining the
excellent performance qualities of the
current FZ engine.

18. Advantages of Direct Injection
 Bettor vaporization
 Higher volumetric efficiency
 Easy cold starting
 Lower exhaust emission
 Higher efficiency and better mileage

19. Conclusion
 From this conclude that the fuel injection system is
more efficient than the conventional mpfi and diesel
engines
 It improves the engine efficiency
 More convenient to use than the diesel engine
 It gives better performance than the diesel engine.
 Lower exhaust emission

20. References
 [1]Kedzia, R., Okoński, A.,
 „Układy paliwowe systemów wtryskowych silników z zapłonem iskrowym”, Poradnik
Serwisowy Nr 1/2002, Instalator Polski, Warsaw 2002, Poland
 [2]Kochersberger, K., Hyde, K. W., Emsen, R., Parker, R. G.„An Evaluation of the 1910
Wright Vertical Four Aircraft Engine”, AIAA-2001-3387, American Institute of
Aero‐nautics and Astronautics, Reston 2001, United States of America
 [3]Mason, F. K„Messerschmitt Bf-109B,C,D,E in Luftwaffe & Foreign Service”, Aircam
Aviation Series No. 39 (Vol.1), Osprey Publishing Limited, ISBN 0-85045-152-3 Berk‐shire
1973, United Kingdom
 [4]Kowalewicz, A.Tworzenie mieszanki i spalanie w silnikach o zapłonie iskrowym”, Wy‐
 dawnictwa Komunikacji i Łączności, ISBN 83-206-0399-4, Warsaw 1984, Poland
 [5]Cygnar, M., Sendyka, B., “Determination of the Total Efficiency of Direct Injection SI
En‐
 gine Working on Stratified Charge”,Wydawnictwo Państwowej Wyższej Szkoły
Zawo‐dowej w Nowym Sączu, ISBN 978-83-60822-46-3, Nowy Sącz 2008, Poland
 [6] „GDI – Gasoline Direct Injection. Nowy silnik benzynowy. Podstawowe informacje
tech‐niczne”, Technical information, Mitsubishi Motors, MMC Car Poland Co. Ltd.,
War‐saw 1998, Poland