ignition system of vehicle,importance, parts and explaination.

Ignition System

Importance of 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.

IGNITION PARTS:

BATTERY provides power for system

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. 

SWITCHING DEVICE mechanical or electronic switch that operates

Ignition coil(Pick-up coil, Crank sensor, Cam sensor).

SPARK PLUG uses high voltage from ignition coil to produce an arc

 in the combustion chamber.

IGNITION SYSTEM WIRES connect components

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.

Ignition Coil

Primary Windings are made up of several hundred turns of heavy wire wrapped around or near the secondary windings.

Secondary Windings consist of several thousand turns of very fine wire, located inside or near the secondary windings.

Distributor

•        Actuates the on/off cycle of current flow through the ignition coil

•        It distributes the coils high voltage to the plugs wires.

•        It causes the spark to occur at each plug earlier in the compression

 stroke as engine speed increases, and vice versa.

•        Changes spark timing.

•        Some distributor shafts operate the oil pump.

Distributor Cap

•        Insulated plastic cap

•        Transfers voltage from coil (wire) to Rotor.

Distributor Rotor

•        Transfers voltage from the distributor cap center terminal(coil) to distributor cap outer terminals(spark plugs).

•        Provides spark in the correct Firing Order.

•        Sometimes the firing order can be found on the intake manifold.