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MULTI POINT FUEL INJECTION SYSTEM ppt.pptx
1. Multi Point Fuel Injection System
Sanoj Kumar
Thermal Engg.
2236010
2. INTRODUCTION
MPFI- a technology used in petrol engines
Uses a small computer to control the car’s engine
In MPFI engine one fuel –injector is installed near each
cylinder ,that is why it is called multi point fuel
injection.
Before MPFI system, there was a technology called
“Carburetor”
3. The computer in the MPFI system decides what
amount of fuel to inject
System also learns from the drivers driving habits
MPFI system makes engine fuel efficient
4. OBJECTIVES
power output
fuel efficiency
emissions performance
ability to accommodate alternative fuels
reliability
drivability and smooth operation
initial cost
maintenance cost
diagnostic capability
range of environmental operation
Engine tuning
5. HISTORY AND
DEVELOPMENT
Herbert Akroyd Stuart developed the first system
The first use of direct gasoline injection was on
the Hesselman engine invented by Swedish
engineer Jonas Hesselman in 1925
One of the first commercial gasoline injection
systems -a mechanical system developed by Bosch
and introduced in 1952 on the Goliath GP700 and
Gutbrod Superior 600
6. Mechanical fuel injection systems
Goliath GP700 Carrera 3.0
Chevrolet introduced a mechanical fuel injection
option, made by General Motors' Rochester Products
division, for its 283 V8 engine in 1956
7. Electronic fuel injection
systems
First commercial EFI system was Electrojector-
developed by the Bendix Corporation
EFI system in the Rambler was a far more-
advanced setup
than the mechanical
types.
Rambler Rebel
8. 1958 Chrysler 300D, Dodge D500, Plymouth Fury,
and DeSoto Adventurer-the first series-production
cars equipped with an EFI system.
D-Jetronic was first used on the VW 1600TL/E in
1967
VW 1600TL/E 1958 Chrysler 300D
9. SUPERSESSION OF
CARBURETORS
Extensive carburetor
modifications and complexities
were needed to approach
stoichiometric engine operation
3 primary types of toxic
emissions from an IC engine:
CO, unburnt HC, and NOx
10. Fuel injection systems have significantly evolved
since mid 1980s.
Current systems provide an accurate, reliable and
cost-effective method of metering fuel and with clean
exhaust emissions-replaced carburetors in the
marketplace
The carburetor remains in use in developing countries
11. Exhaust air or oxygen sensor
Engine temperature sensor
Air flow sensor
Throttle position sensor
Manifold pressure sensor
Camshaft position sensor
Knock sensor
BASIC FUNCTIONS
12. FUNDAMENTALS OF
FUEL INJECTION
MPFI Systems can either be:
• Sequential
• Simultaneous
• Group
These techniques result in better ‘power balance’
amongst the cylinders, higher output from each
one of them, along with faster throttle response
13. 'Sequential' is the best from the above
considerations of power balance/output
“Sefi’’-Sequential Electronic Fuel Injection -
technically is the best of the above variants of
MPFI
The ‘on-board’ ECU primarily controls the
Ignition Timing and quantity of fuel to be
injected
15. Port Injection
The injector is
placed on the side
of the intake
manifold near the
intake port
Every cylinder is
provided with an
injector in its intake
manifold
