IC Engines Introduction

1. Syllabus2. Definition of engine3. Types of engines4. Engine parts5. SI engines – two & Four stroke6. Working principle7. Animation of engine cycle8. Air fuel ratio requirements9. Design of carburetor10. Fuel jet size and venturi size11. Stages of combustion12. Normal and abnormal combustion13. Factors affecting knock14. Combustion chambers15. Introduction to thermodynamic analysis of

SI engine combustion process

Contents

ME2041 Advanced IC Engines

UNIT - I SPARK IGNITION ENGINES

Air-fuel ratio requirements, Design of carburetor –fuel jet size and venture size, Stages of combustion-normal and abnormal combustion, Factors affecting knock, Combustion chambers, Introduction to thermodynamic analysis of SI Engine combustion process.

Engine

……is a device which transfer one form of energy into another form

Internal Combustion Engine

….is a device which produces mechanical power from chemical energy contained in the fuel

ENGINE CLASSIFICATIONS

1. Type of Ignition

2. Engine Cycle

3. Valve Location

4. Basic Design

5. Position and Number of Cylinders

6. Air Intake Process

7. Method of Fuel Input

8. Fuel Used

9. Application

10.Type of cooling


1.Type of Ignition

Spark Ignition (SI)

Compression Ignition (CI)

2. Engine Cycle

Two Stroke

Four Stroke


3. Valve Location

Valves in Head (Over Head Valve)

Valves in Block (Flat Head)

One Valve in Head (intake) & one in

Block)


4. Basic Design

Reciprocating

Rotary


5. Position & Number of cylinders

Single Cylinder

In-Line

V Engine

Opposed cylinder

engine

W engine

Opposed piston

engine

Radial engine


6. Air Intake Process

Naturally Aspirated

Supercharged

Turbocharged

Crankcase

compressed


7. Method of Fuel Input for SI engines

Carbureted

Throttle Body

Injection

Multi Port Injection

Gasoline Direct

Injection


8. Fuel Used

Gasoline

Diesel

Gas (CNG, LPG,

Methane)

Alcohol

Dual Fuel

Gasohol


9. Application

Automobile, Truck,

Bus

Locomotive

Stationary

Marine

Aircraft

Portable


10. Type of cooling

Air Cooled (natural aircooled, Forced air

cooled)

Liquid cooled (water cooled, oil cooled)

Gas cooled (helium)


• Cylinder block• Piston• Piston rings• Piston pin• Connecting rod• Crankshaft

• Cylinder head

• Intake valve• Exhaust

valve• Camshaft• Timing gears• Spark plug

ENGINE PARTS

Cylinder Block

• Basic frame of gasoline engine.

• Contains the cylinder.

Piston

• A sliding plug that harnesses the force of the burning gases in the cylinder.

Piston Rings

• The rings seal the compression gases above the piston keep the oil below the piston rings.

Piston Pins

• Also known as the wrist pin/gudgeon pin, it connects the piston to the small end of the connecting rod.

• It transfers the force and allows the rod to swing back and forth.

Connecting Rod

• Connects the piston and piston pin to the crankshaft.

Crankshaft

• Along the piston pin and connecting rod it converts the up and down motion (reciprocating) of the engine to spinning (rotary) motion.

Flywheel

• Carries the inertia when there is no power stroke.

Cylinder Head

• Forms the top of the combustion chamber.• Contains the valves, the passageways for

the fuel mixture to move in and out of the engine.

Intake and Exhaust Valves

• Doorway that lets the gases in and out of the engine.

Camshaft

• Through the use of an eccentric the cam lobes push the valves open.

• The valve springs close them.

Timing Gears

• These gears drive the camshaft from the crankshaft.

Spark Plug

• Electric match used to begin the combustion process of burning air and gasoline to create heat.

Engine Related Terms

• TDC (top dead center)• BDC (bottom dead

center)• Stroke• Bore• Revolution• Compression Ratio• Displacement • Cycle

Spark Ignition Engines - Two Stroke

Spark Ignition Engines - Four Stroke

Working Principle - Two Stroke

Working Principle - Two Stroke

Working Principle - Four Stroke

Working Principle - Four Stroke

Engine Working - Two Stroke

Engine Working - Four Stroke

IC Engines Introduction

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