Multi Point Fuel Injection System(MPFI)

By,

Satha Siva Pandian . M

2nd year Mechanical Engineering

Introduction

• To Supply a proper Ratio of Gasoline and Air to

Cylinder.

•Without usage of Carburetor to mixing the Fuel and

air In SI Engine.

• Varied the Piston speed using Advanced sensors

(ECU).

Classification of MPFI

By the Placing of the injector it is further classified into two types.

I. Port Injection system .

II. Throttle Injection system

Port Type system

The Injector is Placed in the Intake Manifold near the intake Port .

The Injector Sprays Gasoline into the Air inside the manifold .

Fuel & Air mix in Uniform manner And this mixture Entered into

Cylinder .

Another design of Port Type system

Throttle Injection system

This is similar to carburetor Body with throttle valve

controlling the amount of Air entering intake manifold .

The sensor is used to control the fuel mixing level.

Type Of Injection System

Sketch of MPFI

8 &12 Cylinder MPFI

Engine Control Unit (ECU)

In General ECU in turn is controlled by the Data Input From the set of sensors Located all over the engine & its Auxiliaries.

ECU primarily controls Ignition Timing & Quality of Fuel to be injected.

ECU gives various commands to the Engine Fuel intake system & Spark ignition system , To deliver an Over all Satisfactory Performance of the engine From start to Shut down including Emission Control .

MPFI

Advantages of MPFI

I. Without using of carburetor the product cost is Low.

II. Engine Efficiency is High.

III.Low Maintenance.

IV.High Power to Engine.

V.No extra Heating While Warm up. Etc,.

Disadvantage Of MPFI

1. Hood Height of the Car is High.2. Manifold Heat control System OR Valve is Required.3. Intake Manifold control only air not Fuel .

Throttle fuel injection system

Thank You!