Post on 18-Jan-2015
description
transcript
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