ignition systems of i c engine

1. Ignition System
•Provides a method of turning a spark ignition engine on & off.
•Operates on various supply voltages (Battery & Alternator)
•Produces high voltage arcs at the spark plug electrode.
•Distributes spark to each plug in correct sequence.
•Times the spark so that it occurs as the piston nears the TDC on the
compression stroke.
•Varies the ignition timing as engine speed, load and other conditions
change.

2. Battery Ignition system Parts
BATTERY provides power for system.
i.e. electrical energy for ignition.
IGNITION SWITCH allows driver to turn
ignition on and off.
IGNITION COIL changes battery voltage to
30,000V during normal operation and has a potential
to produce up to 60,000V.
BALLAST RESISTOR is provided in series with the
primary windings to regulate the primary current.

3. Ignition Parts
CONTACT BRAKER is a mechanical device for making
& braking the primary circuit of ignition coil.
DISTRIBUTOR The function of the distributor is to
distribute the ignition surges to the individual spark plugs
in the correct sequence.
SPARK PLUG uses high voltage from ignition
coil to produce an arc
in the combustion chamber.
IGNITION SYSTEM WIRES connect components.

4. Battery Ignition Circuits
PRIMARY CIRCUIT
•Includes all the components
working on low voltage
(Battery, Alternator).
SECONDARY CIRCUIT
•Consists of wires and points
between coil out-put and the
spark plug ground.

5. WORKING OF SYSTEM