Four Stroke Engine Operation

Slides:

Advertisements

Similar presentations

Engine Operating Principles

Advertisements

Four Stroke Gas Engines

ME240/107S: Engine Dissection

How Many Small Engines do you have at home? Do you understand how they work and what makes them run? This presentation is from Virginia Tech and has not.

 A cylinders displacement is the volume of the cylinder when the piston is at BDC.  It is the sum of the displacement of each cylinder.  It is.

5 Principles of Engine Operation, Two- and Four-Stroke Engines.

During the intake or admission stroke, the piston moves downward as a charge of combustible fuel and air is admitted into the cylinder through the open.

HOW THE ENGINE WORKS RK.

Four Stroke Cycle Engine

Diesel Engines TRF 210. History of Diesel Engines 1890 Dr Rudolf Diesel had a theory that any fuel could be ignited by the heat caused by high pressure.

SMALL ENGINES ENGINE OPERATION FOR A FOUR STROKE ENGINE.

Internal Combustion Engines – The Diesel

Automotive Industry Career Opportunities The automotive industry is expected to be one of the top growing career fields. Employment is expected to grow.

By Ryan Saucier. Introduction to Engine Cycles For an engine to operate, a series of events must occur in sequence:

OTTO CYCLE Objective: Explain what is the Otto cycle, how it works and application By: Jonathan Tang.

4 Stroke engine Stroke is defined as the movement of the piston from the 'bottom dead center' (BDC) to the 'top dead center' (TDC) or the other way round,

Two Stroke Cycle Engine

Systems of the Engine.

Two and Four Cycle Engines

Diesel Engine The only difference between diesel engine and a four-stroke gasoline engine is: No sparkplug on Diesel engine. Has a higher compression ratio.

Two Stroke Engine Operation Automotive Technology 1 Mr. Wasacz.

Internal Combustion Engines – The Diesel References Required Principles of Naval Engineering – (pP ) Optional Introduction to Naval Engineering.

Combustion Chamber Combustion chamber is the space enclosed between the piston head and cylinder head when the piston is at top dead center position. Depending.

Bike Basics. What will we see today? A typical spec sheet Engine – What is it? Types of Engines – Two Stroke – Four Stroke – Wankel/Rotary Displacement.

Introduction Diesel Engine.

BRIGGS & STRATTON 4-Cycle Theory.

Gasoline Engines Operation Energy and Power Energy is used to produce power. Chemical energy is converted to heat energy by burning fuel at a controlled.

Engine Cycles Engine Cycles Engine Cycles. Introduction to Engine Cycles For an engine to operate, a series of events must occur in a “specific sequence”

Basic Engine Operation & Construction

G.K.BHARAD INSTITUTE OF ENGINEERING Group :03 G.K.BHARAD INSTITUTE OF ENGINEERING Subject : Element Of Mechanical Engineering Subject Code : Topic.

Two-Cycle and Four-Cycle Engines

JAY DUDHELA Roll Num. - T13EC017 Enr. Num

1 Four Stroke Engines How does a canon work?. 2 Engine Operation Gasoline & diesel engines convert chemical energy into mechanical energy.

Supreme Power Engine Basics The four cycle engine.

ENGINE DESIGN AND OPERATION. ENGINE CLASSIFICATIONS n VALVE ARRANGEMENT n CAMSHAFT LOCATION n IGNITION TYPE n CYLINDER ARRANGEMENT n NUMBER OF CYLINDERS.

Four Stroke Cycle Engine Fundamentals.

The piston descends from the top of the cylinder to the bottom of the cylinder, reducing the pressure inside the cylinder. A mixture of fuel and air,

52 RCACS Ground School Engines PO 407 EO 1 “Basic Construction and Four Stroke Cycle”

Automotive Industry Career Opportunities The automotive industry is expected to be one of the top growing career fields. Employment is expected to grow.

Four Stroke Gas Engines The four strokes of a internal combustion engine are: Intake Compression Power Exhaust Each cycle requires two revolutions of the.

1 Four Stroke Engines How does a canon work?. 2 Engine Operation Gasoline & diesel engines convert chemical energy into mechanical energy.

Lecture 2. Top Dead Center (TDC): Position of the piston when it stops at the extreme point away from the crankshaft. – Top because this position is at.

Part 1.  A cylinders displacement is the volume of the cylinder when the piston is at BDC.  It is the sum of the displacement of each cylinder. 

Objectives Explain the basic function of an internal combustion engine. Describe the five events required for internal combustion engine operation. Describe.

The Small Internal Combustion Engine. Objectives Identify the operating principles of the internal combustion engine. Identify the operating characteristics.

STEP ONE: INTAKE Air and fuel enter the small engine through the carburetor. The carburetor to supply a mixture of air and fuel for proper combustion.

The Heart of the Automobile

5 Principles of Engine Operation, Two- and Four-Stroke Engines.

HOW THE ENGINE WORKS RK.

Automotive Technology

Small Engine Principles of Operation Test

Thermodynamics, Lesson 4-4: The Air Standard Diesel Cycle

Unit - 2 INTERNAL COMBUSTION ENGINES.

Internal Combustion Engines – The Diesel

Engine Cycles This presentation will explore: Engine Operation

How Many Small Engines do you have at home?

POWER GENERATION External And Internal Combustion Engines.

Diesel Automotive Engines

Four Stroke Compression Ignition (CI) Engine

Introduction to Engine Parts, Operation and Function

Engine Design and Classification

Engine Operation Four-Stroke Cycle.

Understanding Principles of Operation of Internal Combustion Engines

The Otto Cycle By: Vijai Sookrah

Energy Conversion Engines take heat energy and convert it into mechanical energy. Motors take electrical energy and convert it into mechanical energy.

Four Stroke Engines How does a canon work?.

The four-stroke engine

Presentation transcript:

Four Stroke Engine Operation Automotive Technology 1 Mr. Wasacz

Objectives The student will be able to describe the four stroke engine operation The student will be able to explain the purpose of each stroke The student will be able to explain the concept of valve timing The student will be able to identify TDC and BDC

What is Stroke? Stroke is the movement of a piston from one end of the cylinder to the other Per stroke, the piston either moves towards the crankshaft, or away from it Basically it’s the distance between TDC and BDC Each stroke is identified by the job it performs

Stroke

Four Stroke Engine (Otto Cycle Engine) In a four Stroke engine, 4 strokes are needed in order to complete one operating cycle The crankshaft requires 2 revolutions to complete one operation cycle The strokes are as follows Intake Compression Power (ignition) Exhaust

Intake Stroke The piston travels from TDC to BDC This movement causes the creation of a partial vacuum. This vacuum draws in the air fuel mixture into the cylinder The larger the bore and stroke, the more air that can be drawn in

Intake Stroke Valve Timing During intake, the intake valve must open at the correct moment to permit the entry of air and fuel Must close at the proper time for correct compression The shape must be streamlined to increase the flow of gases into the combustion chamber

Intake Stroke

Compression Stroke The piston moves from BDC to TDC Both valves must be closed As the piston moves upwards, the air fuel mixture is compressed into a smaller space

Why do we need Compression? When you compress atoms of air and fuel, heat is created Fuel almost reaches a flash point, making combustion practically instantaneous the entire mixture In addition to this, upon combustion, the atoms want to spread out from each other, creating more power pushing down on the piston

Compression Stroke

Power Stroke Piston moves from TDC to BDC Triggered by an electrical spark that jumps the gap of the electrodes of the spark plug Spark is timed to ignite on the compression stroke right before the piston reaches TDC (Done to ensure even burning and pressure on the piston) Air / Fuel is ignited, pushing down on the piston

Power Stroke The amount of power produced is directly related to the compression ratio Compression ratio is the proportionate difference between the volume of the cylinder from BDC to TDC If the compression ratio is to high, fuel may reach flash point and spontaneously combust

Power Stroke

Exhaust Stroke The piston Moves from BDC to TDC Exhaust Valve Opens, allowing the escaping of air As the piston moves up, it pushes out the exhaust gasses The Removal of gasses is called scavenging

Exhaust Stroke Valve The valve must also be streamlined to provide for easy air flow Exhaust gasses are extremely hot! The valve needs to withstand this heat Heat is transferred from the stem to the valve guides When the valve is closed, heat from the head is transferred to the valve seat

Exhaust Stroke