Ignition system

Presented by

Asheem Kumar Palo

Centurion University, INDIA

INTRODUCTIONIgnition systems are mainly of two types;

I. Spark ignition system

II. Compression ignition system

An ignition system obeys laws of conservation of energy. Hence it can be treated as a balance of energy between;

i. That provided by an external source

ii. That released by chemical reaction

iii. That dissipated to the surroundings as thermal energy

REQUIREMENTS OF AN IGNITION SYSTEM

It should provide a good spark between theelectrodes of the plugs at the correct timing

It should function efficiently over the entire range ofengine speed.

It should be light, effective & reliable in service.

It should be compact and easy to maintain.

It should be cheap and convenient to handle.

TYPES OF IGNITION SYSTEMS

The ignition systems are classified dependingupon how the primary energy for operating thecircuit is made available as:

I. Battery Ignition System

II. Magneto ignition system

Battery Ignition System

Components of Battery Ignition System

o Battery

o Ignition switch

o Ballast resistor

o Contact breaker

o Capacitor

o Distributor

o Ignition Coil

o Spark Plug

Operation of Battery Ignition System

cam

switch

ballast Ignitiondistributor

Sparkplug

cylinder

pri

ma

ry

Magneto Ignition System

distributor

coil

cam

condenser

Spark plug

Secondary winding

Primary winding

Rotating magnetTwo poles shown

Contact breaker

Ignition switch

1

2

3

4

Modern Ignition Systems

I. Capacitive discharge ignition system(CDI system)

II. Transistorized coil ignition system(TCI system)

Capacitive discharge ignition system(CDI system)

Transistorized coil ignition system(TCI system)

Advantages

Reduced ignition system maintenance

Reduced wear of the components

Increased reliability

Extended spark plug life

Improved ignition of lean mixture