INTRODUCTION AUTOMOBILE ENGINEERING

ME14 606 -ME14 606 - AUTOMOBILE ENGINEERINGAUTOMOBILE ENGINEERING
Module -1Module -1
Sukesh O.P.Sukesh O.P.
Asst. Professor - MEAsst. Professor - ME
Jyothi Engineering CollegeJyothi Engineering College
April 11, 2017 ME14 606 /SOP& ARA/APME/JECC 1

ME14 606 AE
Objectives
•1 To develop understanding about various
automobile components and systems
•2 To impart concepts modern automotive
controls and safety features

MODULE I – Course Plan
• Introduction – classification of automobiles- automobile
terminology. Modern energy systems for automotive application
-Electric vehicles – hybrid vehicles – LPG and CNG fueled vehicles –
hydrogen fueled vehicles.(basics only)
• Chassis and body – body parts, functions, types, material and
construction. Engines - component details and materials for
cylinder head, cylinder block, piston, piston rings , connecting rod,
crank shaft, valve actuating mechanism, VVT(Variable Valve
Timing).
• Modern Fuel systems: Working and advantages of: Petrol injection
– MPFI (Multi Point Fuel Injection), GDI (Gasoline Direct Injection),
High pressure pump &Injectors, Diesel Injection- CRDI (Common
Rail Direct Injection), Electronic Diesel Control (EDC).

What is an ‘Automobile’??
• A vehicle producing power within itself for its propulsion is known
as a Self propelled vehicle.
• Eg. Moped, Scooter, motorcycle, Car, jeep, truck, tractor, ships,
aircrafts, rocket etc.
• A self propelled vehicle used for transportation of goods &
passengers on the ground is called an Automobile.
• Different from Aeronautical vehicles (planes, helicopters, rockets) &
marine vehicles (ships, boats, submarines)

History of Automobiles
Captain Nicholas Joseph Cugnot – French Army – built the first self
propelled vehicle in 1768-70

First Automobile
Cugnot Steam Trolley, Steam Engine powered, 1768

Karl Benz
Inventor of the first gasoline powered automobile, 1886

Benz Patent Motorwagen – 1886 – first production car powered
by an IC Engine – 954 cc, 2/3 hp or 0.5 kW at 250 rpm

Flocken Elektrowagen – 1888 – World’s first electric carApril 11, 2017 ME14 606 /SOP& ARA/APME/JECC 10

Henry Ford, American Industrialist – Ford Motor Company – founder
of the first affordable Motorcar

COMPONENTS OF AN AUTOMOBILECOMPONENTS OF AN AUTOMOBILE
1. The Basic structure
2. The Engine
3. The Transmission system
4. The Auxiliaries
5. The Controls
6. The Superstructure

1.1. The Basic Structure:The Basic Structure:
It consists of the frame, the suspension system, axles, wheels
and tyres.
1.1. The Engine:The Engine:
It provides the motive power for all various functions which
the vehicle or any part of it, may be required to perform. The
engine for automotive use is IC type.

ENGINE

3.3. The Transmission System:The Transmission System:
It consists of a Clutch, a gear box giving four, five or even
more different ratios of torque output to torque input, a
propeller shaft to transmit the torque output from the gear box
to the rear axle and a differential gear to distribute the final
torque equally between the driving wheels.

Transmission System

4.4. The Auxiliaries:The Auxiliaries:
The Electrical systems.
5.5. The Controls:The Controls:
They consists of steering systems and brakes
6.6. The Super Structure:The Super Structure:
In those cases where frameless construction is not
adopted there must be super structure i.e, the body.

Engine SystemsEngine Systems
1. Cooling System
2. Fuel System
3. Lubrication System
4. Ignition System
5. Electrical System

Basic Engine Terminology
1. Bore: The inside diameter of the cylinder is called bore
2. Stroke: The linear distance along the cylinder axis between two
limiting position s is called stroke.
3. Top Dead Center ( T.D.C.) : The top most position of the piston
towards cover end side of the cylinder is called T.D.C.
4. Bottom dead Center ( B.D.C.) : The lowest position of the piston
towards the crank end side of the cylinder is called B.D.C.
5. Clearance Volume : The volume contained in the cylinder above
the top of the piston , when the piston is at top dead center , is
called the clearance volume.
6. Swept Volume: The volume swept through by the piston in moving
between T.D.C. and B.D.C, is called swept volume or piston
displacement.

Basic Engine Terminology
7. Compression Ratio: It is the ratio of Total
cylinder volume to clearance volume
Comp. Ratio
6:1 to 10:1 for Petrol engines
15:1 to 25:1 for Diesel engines
Comp. Temp.
250*C for S.I.
600*C for C.I.
Comp. Pressure
1 MPa for S.I.
3.5 MPa for C.I.

Classification Of Automobiles
1.1. Based on PurposeBased on Purpose
1. Passenger Vehicles – Car, Bus, Motorcycle
2. Goods Vehicles – Lorry, truck, Pick up
1.1. Based on CapacityBased on Capacity
1. Heavy Motor Vehicle (HMV) – large trucks, Buses, Tractor
2. Light Motor Vehicle (LMV) – Cars, Jeep, Motor cycles
3. Medium Vehicle – Small trucks, Minibus, Tempo

Classification Of AutomobilesClassification Of Automobiles
3. Based on Fuel Source3. Based on Fuel Source
1. Petrol Engine 2. Diesel Engine
3. Gas Vehicles 4. Solar Vehicles
5. Hydrogen Vehicles 6. Electric Vehicles
7. Steam Engine vehicles
8. Hybrid Vehicles
9. Hybrid Electric Vehicles
4.4. Based on Type of TransmissionBased on Type of Transmission
1. Automatic transmission vehicles – mostly American
2. Conventional transmission vehicles – Most Indian Vehicles
3. Semi - Automatic transmission vehicles – mostly British

5. Based on Make5. Based on Make
1. MARUTI SUZUKI 2. HINDUSTAN MOTORS
3. TATA MOTORS 4. MAHINDRA & MAHINDRA
5. TVS MOTORS 6. HERO MOTOCORP
7. ASHOK LEYLAND8. EICHER MOTORS
9. FORCE MOTORS 10. BAJAJ AUTO LTD
11. ROYAL ENFIELD
12.VOLVO, VOLKSWAGEN, MERC BENZ, BMW,
CATERPILLAR, BENTLEY, AUDI etc.

6. With respect to the drive6. With respect to the drive
1. Left Hand Drive 2. Right Hand Drive
3. Fluid Drive 4. Front Wheel Drive
5. Rear Wheel Drive 6. All Wheel Drive (AWD or 4WD)
7.7. With respect to the SuspensionWith respect to the Suspension
1. Conventional – Leaf Spring
2. Independent – Coil, Torsion bar, MacPherson Strut

8. With respect to the Type of Engine8. With respect to the Type of Engine
1. Reciprocating – Piston Engines
2. Rotary – Wankel Engine, Gas turbine
9. With respect to the body & doors9. With respect to the body & doors
1. Sedan
2. Hatchback
3. Station Wagon
4. Convertible
5. Sports utility vehicle
6. Multi Utility Vehicle (MUV or MPV)
7. Delivery Vans etc

1010. Based on no. of wheels. Based on no. of wheels
1. Two wheeler
2. Three wheeler
3. Four
4. Six

Indian Automakers

European Automakers

Japanese Automakers

American Automakers

Italian Automakers

French Automakers

Swedish Automakers

German Automakers

Rank of Manufacturer’s by production (2013)
1. TOYOTA – JAPAN 6. NISSAN – JAPAN
2. GENERAL MOTORS – USA 7. FIAT CHRYSLER –
ITALY
3. VOLKSWAGEN – GERMANY 8. HONDA – JAPAN
4. HYUNDAI – SOUTH KOREA 9. SUZUKI – JAPAN
5. FORD – USA 10. RENAULT - FRANCE

This is a list of the 10 largest
manufacturers by production in 2015
Rank Group Country Vehicles
1 Toyota Japan 10,083,831
2 Volkswagen Germany 9,872,424
3 Hyundai South Korea 7,988,479
4 General Motors United States 7,485,587
5 Ford United States 6,396,369
6 Nissan Japan 5,170,074
7 Fiat Chrysler Automobiles Italy/ United States 4,865,233
8 Honda Japan 4,543,838
9 Suzuki Japan 3,034,081
10 Renault France 3,032,652

The Transmission systemThe Transmission system
General layout of transmission system of an automobile

Functions of transmission systemFunctions of transmission system
1. To disconnect the engine from the road wheels when required.
2. To connect the engine to the driving wheels without shock
3. To vary the leverage between the engine and driving wheels.
4. To reduce the engine speed permanently in a fixed ratio
5. To turn the drive through a right angle.
6. To make provision such that the driving wheels may rotate at
different speeds while taking turns.

Various components of transmission
system
1) Engine
2) Clutch
3) Gearbox
4) Universal joints
5) Differential
6) Wheels
7) Front and rear axles

.
 ClutchClutch : Its purpose is to enable the driver to disconnect the
drive from the road wheels instantaneously and to engage
drive from the engine to the road wheels gradually while
moving the vehicle from rest.
 GearboxGearbox : The gear box or the transmission provides the
necessary leverage variation between the engine and road
wheels.
 DifferentialDifferential : While taking turns, the driving wheels must at
different speeds. This is done with the help of differential.

Engines

Engine & Engine componentsEngine & Engine components

Engine & Engine componentsEngine & Engine components
1. Cylinder Block 2. Cylinder head
3. Crankcase 4. piston
5. Piston rings 6. Piston pin
7. Connecting rod 8. Crank shaft
9. Flywheel
10. Valves and valves mechanism
11. Rocker arm 12. Camshaft
13. Accessories: Air cleaner, oil filter, automatic chokes,
automatic heat controls.
other parts: Spark plug, ignition devices, carburetor

Engine componentsEngine components
1.1. Cylinder blockCylinder block
It consists of three parts.
 The cylinder in which the pistons slide up and down.
 The passages for the flow of cooling water.
 The bottom of the block supports the crankshaft, oil sump and
camshaft.
• Various engine accessories & clutch housing are bolted to it.
The Cylinder block is usually made from grey cast iron. Sometimes
its made with addition of nickel or chromium, Aluminium and
Compacted Graphite Iron(CGI) – heavy duty alloy.

Engine components :Engine components : 1.Cylinder block1.Cylinder block
Cylinder block and crankcase form a single casting
(monoblock). It gives a rigid structure and extra strength.
The Cylinder block may also have a separate crankcase
for the crankshaft.(Individual block)
Advantages of Monoblock
No water leakage, more rigid
Size is reduced, easy water circulation
Advantages of Individual block
Easy for repairing, less replacement costApril 11, 2017 ME14 606 /SOP& ARA/APME/JECC 47

Cylinder Block (Monoblock)

2. Cylinder Head2. Cylinder Head
The top of the cylinder is covered by a separate cast piece known as
the cylinder head. It is bolted to the cylinder block.
It is usually made of grey iron or Aluminium alloy. Aluminium has the
advantage of light in weight and high heat conductivity.
A flat piece of gasket is placed is placed between the cylinder head
and block to retain compression in the cylinder and to provide a gas
and water tight seal.
Gasket made of Copper-asbestos-Copper.
•Camshafts, rockers & valves may be carried on the cylinder head.
•Water passages may also be provided to cool the valves, the head and
the spark plugs.

3.Piston3.Piston
Piston helps to convert the chemical energy obtained by
the combustion of fuel into useful mechanical power.
The purpose of the piston is to provide a means of
conveying the expansion of the gases to the crankshaft through
the connecting rod.
It is provided with piston rings to provide a good seal
between the cylinder wall and piston. It has to withstand very
high temperatures of combustion.

PistonPiston
Materials Used
Aluminium alloys, Cast
steel,
Cast Iron or Chrome Nickel

Engine components :Engine components : PistonPiston
Head or Crown: top of the piston
Ring grooves
Skirt: parts below the ring grooves
Lands: the portion that separates the grooves.
The piston must posses the following qualitiesThe piston must posses the following qualities
Rigidity to withstand high pressure.
Lightness to reduce weight and inertial forces.
Good heat conductivity to reduce the risk of detonation
Silence in operationApril 11, 2017 ME14 606 /SOP& ARA/APME/JECC 54

4.Piston rings4.Piston rings
Fine grained alloy cast iron used for the piston rings.
Cast Iron plated with Chromium, Cadmium or Tin.
Functions:Functions:
 Prevent the escape of burnt gases from the combustion
chamber past the piston (Crank case blow by).
 Prevent the leakage of oil into the combustion space.
Heat from the piston is transmitted to the cylinder via piston
rings.

Piston Rings

a.a. Compression rings:Compression rings:
o Prevents the blow by or escape of burnt gases to the crank case.
o 2 or 3 compression rings are fitted into the top grooves.
o A gap is formed in the ring to impart the property of radial
expansion and compression.
o This gap is necessary for assembly and renewal of ring
o Made from Cast Iron plated with Chromium, Cadmium and Tin.

Compression Ring

b. Oil Control rings:b. Oil Control rings:
oThese rings scrap off excessive oil from the cylinder wall and
return it to the oil sump.
oThe oil control ring is fitted into the lower groove of the piston.
oOil control grooves has a series of slots. These slots transfer the
excess oil through the holes in the piston groove to the inside of
the piston and to the sump
oMade from steel, outer edges of the rings chromium plated

5.Connecting rod5.Connecting rod
The connecting rod usually has I-beam cross-section.
Small end is connected to the piston pin and big end to the crank pin
The function of the connecting rod is to convert linear motion of the
piston into rotary motion of the crankshaft.
The connecting rod carries the power thrust from piston to the crank
pin. So it must be strong, rigid and as light as possible.
Always made from steel forgings, in few cases Aluminium alloy is
used.

5. Connecting rod5. Connecting rod
• Cross section is an “H” or “I”
• Types include :
a) Plain Rod
b) Fork and blade rod
c) Master and articulated

a) Plain Roda) Plain Rod
o Used on inline and opposed engines
o Small bushing at piston pin end is pressed in place and reamed to
final dimensions
o Large end of rod includes a cap, bolts, nuts, and plain bearing
inserts
o Rods are numbered as to cylinder and for cap-to-rod alignment

b) Fork and Blade Connecting Rodb) Fork and Blade Connecting Rod
• Used on “V” type engines
• One rod inside another allows cylinders to be aligned and to
share a common location on the crankshaft

Fork and Blade Type C Rod

c) Master and Articulating Rodc) Master and Articulating Rod
o Used on radial engines
o Uses “knuckle pins” to retain articulated rods to master

6. Crank shaft6. Crank shaft
It is the 1st
part in the power transmission.
The reciprocating motion of the piston is converted into rotary
motion of the crankshaft with the help of connecting rod.
It consists of crankpins, webs, balancing weights and main
journals.
Big end of connecting rod is connected to the crankpin of the
crankshaft.
The crank shaft is supported by the main bearings on the main
journals.
Made of Casting or forging of heat treated alloy steel.

Crankshaft

Engine components :Engine components : 6.Crank shaft6.Crank shaft

Valve Actuating MechanismsValve Actuating Mechanisms
 To admit the air-fuel mixture in the engine cylinder and to
force the exhaust gases out at correct timings, some control
system is necessary, which is provided by the valves.
 The engine valves may be broadly divided into 3 main
categories:
1. Poppet valve
2. Sleeve valve
3. Rotary valve
A most common type of valve used at present is poppet valve.

Valves
• Usually made of Austenitic Stainless Steel which is a corrosion &
heat resisting material.
• Race engines use Beryllium-Copper alloy seats with Titanium
valves (21-4N) – 40% lighter than Steel.

Poppet ValvePoppet Valve
• The valves are operated by cams mounted on a camshaft.
• According to the location of the valves,
the valve mechanisms are
a. Straight poppet valve mechanism
b. Overhead poppet valve mechanism
c. Overhead camshaft mechanism

.
• The valve mechanism to operate
the valve when it is in the
engine block(as in L,T and F-
head).
a. Straight (or side) poppet valvea. Straight (or side) poppet valve
mechanismmechanism

b. Overhead poppet valve mechanismb. Overhead poppet valve mechanism
• The valve mechanism to operate the
valve when it is in the cylinder head( as in
I and F head design).
• It requires two additional moving parts-
the push rod and the rocker arm. As the
cam rotates, it lifts the valve tappet.
• It actuates the push rod and thereby the
rocker arm end pushes the valve stem to
open the valve.
c

Overhead Poppet Valve Mechanism

c. Overhead camshaft mechanismc. Overhead camshaft mechanism
• In this type, the camshaft is
mounted above the valve in the
cylinder head.
• The cam on the cam shaft operates
the valve directly. A small clearance
is provided in between the cam and
valve cap.
• The clearance is adjusted by
providing small shims in the bottom
of the cap.
c

SOHC & DOHC

Variable Valve Timing (VVT)

Variable Valve Timing (VVT)
• Variable Valve Timing (VVT) is the process of
altering the timing of a valve lift event, and is
often used to improve performance, fuel
economy or emissions. It is increasingly being
used in combination with variable valve
lift systems.

• 1. Phase changing systems:1. Phase changing systems: With a single
camshaft, all the valve events for both intake
and exhaust valves are shifted by the same
amount, whereas if separate camshafts are
used for intake and exhaust valves, such a
phase changing system can change the valves
events can be changed independently for the
intake and the exhaust valves.

2. Profile switching systems:2. Profile switching systems: these can change
independently the valve-event timing and the
valve lift. There are two camshafts with separate
cam profiles. The system enables the valve
operation to be switched between these
camshafts at a particular engine speed.
-High power output
-Low emission level

3. Variable event-timing systems:3. Variable event-timing systems: can change
both the phase and duration of valve events and
can be optimized for different engines speed
and load conditions due to which it is obtain:
I.Increase in full-load torque.
II.Reduction in part-load emissions.
III.Fuel economy e.g. decrease of exhaust
emissions.

4. Variable lift systems:4. Variable lift systems: the main adv. Of such
systems is reducing the pumping losses due to
convectional throttle.
5. Electronic valve actuation systems:5. Electronic valve actuation systems: due to
their precise control, these have the maximum
potential for optimizing the valve events.
Besides, all the valve events including the lift csn
be directly controlled.

Automobile Chassis
• Chassis – French term used to denote the main structure of a vehicle
• It’s the backbone of the vehicle – made of steel.
• All moving parts are fitted to it.
• To give it extra strength it is provided with bolted, riveted or welded
cross pieces.
• All major units required to propel the vehicle, direct its motion,
stop it as well as permit to run smoothly over varying road surface
is known as chassis.

Automobile Chassis
• The power unit is connected with the transmission.
• The structural frame fitted to the axles through the suspension
system carries the power train.
• For an automobile to propel safely on the road, the engine, the
transmission system, suspension, steering & brakes are included to
the basic frame. These units combined together – Chassis.
• The body or Cabin is jointed to the cabin by means of bolts & nuts
or by welding.

Chassis Components
• Frame
• Front Suspension
• Steering Mechanism
• Wheels, Tyres and axles – rear & front springs & shock absorbers
• Engine, Clutch & Gearbox
• Propeller shaft
• Radiator
• Differential, half shaft & universal joint
• Brakes & Braking system
• Fuel tanks, pipes & connecting fuel lines.
• Battery & electrical system
• Silencer
• Car Body
• Car Body accessories like lights, radio, wiper, mirrors etc.

• Fast pick up
• Strength & Safety
• Durability
• Dependability
• Ease of control
• Quietness
• Speed
• Power accessibility
• Low centre of gravity
• Simplicity of lubrication
• Economy of operation.
Desired qualities of a Chassis

body

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