Elumalai Polytechnic College

Topic: Gasoline Direct Injection

ANANDA BABU PSEENU VASAN M

Department of Automobile Engineering

Gasoline Direct Injection

G D IEngine Technology

Contents

IntroductionTimeline of Fuel supply systemMain Component of GdiElectronic Fuel InjectorMultipoint Fuel InjectorGasoline Direct InjectorWorking and Burning Mode AchievementsConculsion

INTRODUCTION At a time of even greater demand on automotive

manufactures to further improve, ◦ fuel efficiency , ◦ Performance and ◦ emission standards

Gasoline direct injection (GDI) engine technology to improve Engine efficiency without making a major shift away from conventional IC technology

But, for larger vehicles, port fuel injection was still not a 100 % success. This was due to its large engine size, and improper combustions.

So, the birth of the Gasoline Direct Injection (GDI) took place

Timeline of Fuel Supply System

Carburetor Port Injection(MPFI)

Direct Injection(GDI)

MAIN COMPONENTS OF GASOLINE INJECTION

1. Engine Control Unit 4. Fuel Injector2. Sensors3. High pressure Fuel Pump

Engine Control Unit (ECU) ECU is a HEART of The Engine .Ecu is computer that controls all of the electronic Components on the engine.Working of Ecu

• Control of fuel mixture• Control of ignition timing• Control of idle speed• Control of variable valve timing• Electronic valve control

Sensors In order to provide the correct amount of fuel for every operating condition, the ECU has to monitor a huge number of input sensors. •Acceleration pedal sensor•Airflow sensor•Hi pressure pump sensor•CrankAngle sensor•GDI

Injector

A fuel injector is nothing but an electronically controlled valve.

When the injector is energized, an electromagnet moves a plunger that opens the valve, allowing the pressurized fuel to squirt out through a tiny nozzle.

It is controlled by the ECU.

ELECTRONIC FUEL INJECTION

1. Multipoint Fuel Injection 2.Gasonline Direct Injector

VS

MULTI POINT FUEL INJECTION SYSTEM

Have a separate fuel injector for each cylinder . Have better cylinder to cylinder distribution. Eliminate the need to preheat the intake manifold

Gasoline Direct Injection

•GDI is a process where a mixture of fuel and air is sent into the engine through a highly pressurized.•The injector is connected along with the intake valve, exhaust valve and the spark plug•The injector, injects the mixture according to the speed of the engine. The intake valve is used for only air.•More air means more combustion. •Compression ratio is high as 12.5:1 at its peak value,

Working GDI

Acceleration Pedal ECU

Air flow Sensor

HI Pressure Fuel pump GDI

SP

IC Engine

GDI Burning mode  1. Ultra-lean burn mode: At lower speeds, the mixture is injected at the end of the compression stroke for lowest heat losses. This is when the compression ratio in the cylinders is maximum 2. Stochiometric mode: This is the conventional method of injection during the intake stroke for optimum combustion and minimum waste gases during moderate city driving conditions. 3. Full Power mode: Fuel is injected in the intake stroke at a higher .This is done at high speeds or high load conditions like climbing a hill.

Requirement of GDI Engine

The Upright Straight Intake Port. The Curved-top Piston. The High Pressure Fuel Pump. The High Pressure Swirl Injector.

• Vehicle Acceleration Engine

Performance

ACHIEVEMENTS

MPFI

GDI

0 2 4 6 8 10 12 14

Vehicle Fuel Consumption Fuel Consumption During Idling

Emission Control

CONCLUSION

Provides improved torque 5-10%Up to 5% more power

Reduction of CO2 production by nearly 20 percent. Fulfills future emissions requirements.97% NOx reduction is achieved.Improve the brake specific fuel consumption. Reduced fuel consumption 15-20%

Thank you