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  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
  14. VARIOUS INJECTION SCHEMES MPFI system Port injection Throttle Body injection D-MPFI System L-MPFI System
  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
  16. Throttle Body Injection System
  17. D-MPFI System
  18. L-MPFI System
  19. CONCLUSION  Improved fuel consumption  Better for the environment  Better performance