fuel delivery system

CHAPTER 1:FUEL DELIVERY

SYSTEM

CARBURETOR SYSTEM

FUEL INJECTION SYSTEM

PETROL FUEL SYSTEM

DIESEL FUEL SYSTEM

FUEL INJECTION SYSTEM

FUEL DELIVERY SYSTEM

INTRODUCTION

1.1 PETROL FUEL SYSTEM

CARBURETOR SYSTEM

BERNOULLI’S PRINCIPLE

V P

COMPONENTS FUNCTIONChoke valve To enrich the mixture during cold

startThrottle valve Control the amount of air to be

pulled into the combustion chamberFloat valve Control the amount of fuel contain

inside the float chamberFloat chamber Act as the reservoir of the fuelJet Control the correct amount of fuel at

the venturi especially while idling

Idling system – supplies air-fuel mixture during closed throttle operation

Operation of Carburetor System

Float bowl in the carburetor is supplied with fuel from fuel tank by fuel pump

Air passes through venturi and causes fuel to pushes out from jet

As throttle valve opens more air passes through venturi

ELECTRONIC FUEL INJECTION

COMPONENTS

EFI SYSTEMS

EFI COMPONENTS FUNCTIONManifold Absolute Pressure (MAP sensor)

Reads atmospheric pressure

Coolant Temperature (CTS sensor)

Report engine coolant temperature

Oxygen sensor (02 sensor) Measure the amount of oxygen in the exhaust gas

Engine Speed Sensor Measure how fast the engine crankshaft turningThrottle Position (TPS Sensor) Reports the position of the throttle valveElectronic Control Module (ECM)/Electronic Control Unit (ECU)

Receive data from all the sensors and calculate how much fuel to inject

Injectors Control the amount of fuel to be injected

Operation of EFI SystemECM continuously receives all data from the

sensor

ECM check the data and compare with the data stored in look-up table in its memory

ECM decides when to open the injectors and for how long

COMPRESSION POWER EXHAUSTINTAKE

A)

B)

SI ENGINE

CI ENGINE

STATE THE DIFFERENCES??

WHICH ONE CI ENGINE AND SI ENGINE??

Description

SI Engine CI Engine

Fuel Gasoline, a highly volatile fuel. Self-ignition temperature is high.

Diesel oil, a non-volatile fuel. Self-ignition temperature is comparatively low.

Introduction of fuel

A gaseous mixture of fuel and air is introduced during the suction stroke. A carburetor is necessary to provide the mixture.

Fuel is injected directly into the combustion chamber at high pressure at the end of the compression stroke. A fuel pump and injector are necessary.

Load control

Throttle valve controls the quantity of mixture introduced.

The quantity of fuel is regulated in the pump. Air quantity is not controlled.

Ignition Requires an ignition system with spark plug in the combustion chamber.

Self-ignition occurs due to high temperature of air because of the high compression.

Compression ratio

6 to 10. Upper limit is fixed by antiknock quality of the fuel.

16 to 20. Upper limit is limited by weight increase of the engine.

1.2 DIESEL FUEL SYSTEM

Injector Nozzle

Diesel Fuel Filter

Rotary-Distributor

Inline-Plunger Injection

TYPES OF DIESEL FUEL

PUMPS

Inline Fuel Injection Pump

Disassemble Inline fuel injection pump Actual position Inline fuel injection pump

Effective stroke-amount fuel injected

• to control the fuel to the exact stroke

Distributor Fuel Injection Pump

Actual position Distributor fuel injection pump

Sectioned view Distributor fuel injection pump

DIESEL PISTON