Automotive EFI Engine working procedure 

1. Describe Automotive EFI
Engine working procedure

2. Presented By
Nur-E-Alam Siddike
ID:- 10307050
Program: BSME
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3. Aim of EFI Engine
 Get Maximum efficiency of engine power
Ensure 100% fuel burn
Reducing fuel cost
Reducing air pollution

4. How EFI Works?
• There are three sub-systems in EFI
the fuel delivery system
air induction system
the electronic control system
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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.
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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.
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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.
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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. Various engine Sensor
Air flow meter
Throttle positioning sensor

10. Various engine Sensor
Manifold Absolute Pressure Sensor (MAP)

11. Various engine Sensor
Knock sensor
Oxygen sensor

12. Various engine Sensor
Coolant temp sensor
Air temp sensor

13. Various engine Sensor
Cam shaft sensor
Crank shaft sensor

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.
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15. Eletorinc Fuel Injection System

16. Advantages
Improved Atomization
Better fuel flow
Smoother idle
Increased engine power
Improved fuel economy
Lower emissions
Better cold weather drivability
Simpler

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
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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.
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19. Bibliography
1. YAHOO.ANSWER.COM
2. GOOGLE.COM