Presentationon

Working of a four wheeler(4 stroke diesel Engine)In partial fulfillment of the subject

Elements of Mechanical Engineering

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Car Components.

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What is Engine?

• Engine is a Prime Mover which converts Natural Source(fuel) in to mechanical energy.

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Basic classification of Engines.

On the Basis of…• Stroke: Two-stroke/Four -stroke• Fuel used: Diesel/Petrol• Cylinder position: Horizontal/Vertical.• Ignition of Fuel: Compression ignition/ Spark Ignition

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Basic Parts of the Diesel Engine

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

• Cylinder head• Intake valve• Exhaust valve• Camshaft• Timing gears• Spark plug

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Piston

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

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Connecting Rod

• Connects the piston and piston pin to the crankshaft.

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Crankshaft

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

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Intake and Exhaust Valves

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

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Four Stroke Cycle

• Intake• Compression • Power• Exhaust

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Intake Stroke

• Intake valve opens.• Piston moves down

TDC(Top Dead Center) to BDC(Bottom Dead Center)

• A vacuum is created in the cylinder.

• Atmospheric pressure pushes the air into the cylinder.

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Compression Stroke

• Both valves close.• Piston moves from

BDC to TDC.• Air is compressed.• At the end fuel is

dropped by fuel injector.

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Power Stroke

• Both valves remain closed.

• Due to high Temperature Fuel combustion takes place.

• Piston moves down from TDC to BDC

• Heat is converted to mechanical energy.

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Exhaust Stroke

• Exhaust valve opens.• Piston move from BDC

to TDC.• Exhaust gases are

pushed out polluting the atmosphere.

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Diesel Animation

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Advantages• Better fuel economy and longer engine life. • For a fairly long time usage, the equation

works great in a big diesel tractor-trailer rig that is running 400 miles every day, but it is not nearly so beneficial in a passenger car.

• Lower Fuel cost compared to Gasoline Engine.

• Diesels are more reliable. Because they don’t need high-voltage ignition systems, diesel engines never fail for lack of a spark. 

Reference.

• www.howstuffworks.com• en.wikipedia.org

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Thank You

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