Post on 20-Aug-2015
Describe Automotive EFI Engine working procedure
2
Presented By
Nur-E-Alam Siddike
ID:- 10307050
Program: BSME
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 EFIthe fuel delivery systemair induction systemthe electronic control system
5
Fuel Delivery SystemThis system consist of the:
fuel tank,fuel pump,fuel filter,fuel delivery pipe,fuel injector,fuel pressure regulator, andfuel return pipe.
6
The Air Induction System
This system consist of the:air cleaner,AIR FLOW METERthrottle valve,air intake chamber,intake manifold runner, andintake valve.
7
Electronic Control System
This system consist of the:Electronic Control Unit (ECU),Various engine SENSORS,Fuel injector assemblies, and related wiringThe 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.
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.
Various engine Sensor
Air flow meterThrottle positioning sensor
Various engine Sensor
Manifold Absolute Pressure Sensor (MAP)
Various engine Sensor
Oxygen sensorKnock sensor
Various engine Sensor
Air temp sensor Coolant temp sensor
Various engine Sensor
Cam shaft sensor Crank shaft sensor
14
Basic Operation of ECU SystemAir 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.
Eletorinc Fuel Injection System
AdvantagesImproved Atomization Better fuel flow Smoother idle Increased engine powerImproved fuel economyLower emissions Better cold weather drivability Simpler
Tuesday, April 18, 2023 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.
18
ConclusionThe EFI increases the performance of the
engine.The EFI system is more economical and
produces greater powerAir pollution reducer and smoother drivability
than any other system.So we should use Electronic Fuel Injection
system (EFI) in every internal Combustion Engine.
Bibliography
1. YAHOO.ANSWER.COM2. GOOGLE.COM