EFI Engine working procedure 


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Automotive EFI Engine working procedure 

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EFI Engine working procedure 

  1. 1. Describe Automotive EFI Engine working procedure
  2. 2. Presented By Nur-E-Alam Siddike ID:- 10307050 Program: BSME 2
  3. 3. Aim of EFI Engine  Get Maximum efficiency of engine power Ensure 100% fuel burn Reducing fuel cost Reducing air pollution
  4. 4. How EFI Works? • There are three sub-systems in EFI the fuel delivery system air induction system the electronic control system 4
  5. 5. Fuel Delivery System This system consist of the: fuel tank, fuel pump, fuel filter, fuel delivery pipe, fuel injector, fuel pressure regulator, and fuel return pipe. 5
  6. 6. The Air Induction System This system consist of the: air cleaner, AIR FLOW METER throttle valve, air intake chamber, intake manifold runner, and intake valve. 6
  7. 7. Electronic Control System This system consist of the: Electronic Control Unit (ECU), Various engine SENSORS, Fuel injector assemblies, and related wiring The ECU determines precisely how much fuel needs to be delivered by the injector based on the engine SENSORS output. Injector is turned On for the precise amount of time to deliver proper air/fuel ratio to the engine. 7
  8. 8. Electronic Control Unit Uses electrical data from the sensors to control the operation of the fuel injectors. Electronic Control Module (ECU or ECM)- “Brain” of the electronic fuel injection.
  9. 9. Various engine Sensor Air flow meter Throttle positioning sensor
  10. 10. Various engine Sensor Manifold Absolute Pressure Sensor (MAP)
  11. 11. Various engine Sensor Knock sensor Oxygen sensor
  12. 12. Various engine Sensor Coolant temp sensor Air temp sensor
  13. 13. Various engine Sensor Cam shaft sensor Crank shaft sensor
  14. 14. Basic Operation of ECU System  Air enters the engine and then measured by the AIR FLOW METER,  As the air flows into cylinder, fuel is mixed into the air by injector,  ECU pulses the injector On and OFF. When it is ON just enough spraying of fuel occurs, to ensure ideal air /fuel ratio 14.7:1(14.7 parts of air to 1 part of fuel by mass) The ECU Control delivers precise amount of fuel to the engine,  The injection quantity depend on variables such as:  coolant temperature  engine speed (rpm)  throttle angle,  exhaust oxygen content. 14
  15. 15. Eletorinc Fuel Injection System
  16. 16. Advantages Improved Atomization Better fuel flow Smoother idle Increased engine power Improved fuel economy Lower emissions Better cold weather drivability Simpler
  17. 17. Recommendation  A better Knowledge and skills to install all of the necessary sensors and wiring.  Check for better performance.  Adjust all the circuit and sensor with the ECU carefully.  Before launce EFI system must test ECU with the help of computer or testing devices.  Should provide EFI profile and duration of it that how long it work.  Error must be checked & evacuated for precision of engine. Wednesday, February 26, 2014 17
  18. 18. Conclusion The EFI increases the performance of the engine. The EFI system is more economical and produces greater power Air pollution reducer and smoother drivability than any other system. So we should use Electronic Fuel Injection system (EFI) in every internal Combustion Engine. 18
  19. 19. Bibliography 1. YAHOO.ANSWER.COM 2. GOOGLE.COM