MULTI POINT
FUEL
INJECTION
SYSTEM
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Multi point fuel injection system, Assignments of Automobile Engineering
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MULTI POINT
FUEL
INJECTION
SYSTEM
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”
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
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
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
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
Exhaust air or oxygen sensor (^) Engine temperature sensor Air flow sensor (^) Throttle position sensor Manifold pressure sensor (^) Camshaft position sensor Knock sensor
BASIC FUNCTIONS
'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 SCHEMES MPFI system Port injection Throttle Body injection L-MPFI System D-MPFI System
Throttle Body Injection System
D-MPFI System
CONCLUSION Improved fuel consumption (^) Better for the environment Better performance