Multi Point Fuel Injection System
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MULTI POINT FUEL INJECTION SYSTEM
INTRODUCTION MPFI- a technology used in petrol engines Uses a small computer to control the cars 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
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
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
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
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
Electronic fuel injection systems First commercial EFI system was Electrojector-
developed by the Bendix Corporation EFI system in the Rambler was a far moreadvanced setup than the mechanical types.
Rambler Rebel
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
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
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
BASIC FUNCTIONS Exhaust air or oxygen sensor Engine temperature sensor Air flow sensor Throttle position sensor Manifold pressure sensor Camshaft position sensor
Knock sensor
FUNDAMENTALS OF FUEL INJECTION
MPFI Systems can either be: Sequential Simultaneous GroupThese techniques result in better power balance amongst the cylinders, higher output from each one of them, along with faster throttle response
'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
VARIOUS INJECTION SCHEMESMPFI system
Port injection
Throttle Body injection
D-MPFI System
L-MPFI System
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
Throttle Body Injection System
D-MPFI System
L-MPFI System
CONCLUSION Improved fuel consumption Better for the environment Better performance