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es a method of turning a spark ignition engine on & rates on various supply voltages (Battery & Alternator) es high voltage arcs at the spark plug electrode. ibutes spark to each plug in correct sequence. spark so that it occurs as the piston nears the TD ion stroke. he ignition timing as engine speed, load and other
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Page 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.

Page 2: Ignition system

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.

Page 3: Ignition system

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.

Page 4: Ignition system
Page 5: Ignition system

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

Secondary Windings consist of several thousandturns of very fine wire, located inside or nearthe secondary windings.

Page 6: Ignition system

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

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

Page 7: Ignition system

•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.

Page 8: Ignition system

PARTS Distributor Cam, Breaker Points, and Condenser.

Page 9: Ignition system

Points are wired in Primary Circuit – When the points are closed, a magnetic field builds in the coil. When the points open, the field collapses and voltage is sent to one of the spark plug.

Page 10: Ignition system

Transistorized Coil Ignition (TCI) system

Page 11: Ignition system

•Trigger wheel passes by the pick-up coil.

•# of cylinders = # of teeth.

Page 13: Ignition system

•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.

Page 14: Ignition system

 

How early or late the spark plug fires in relation to the position of theengine piston.

Ignition timing must change with the changes in engine speed, load, and temperature.

Page 15: Ignition system

Timing Advance occurs when the plug fires sooner on compressionstroke (High engine speed)

Timing Retard occurs when plug fires later on compression stroke(Lower engine speed)

BASE TIMING Timing without vacuum or computer control.

Page 16: Ignition system

Distributor Centrifugal Advance•Controlled by engine speed.

•Consists of two weights and two springs.•At high speeds the weights fly out(held by the springs), rotating the cam, hence advancing the timing.

Page 17: Ignition system

Vacuum Advance

•Controlled by engine intake manifold vacuum and engine load.

•The vacuum diaphragm rotates the pickup coil against the direction of distributor shaft rotation.

Page 20: Ignition system

Distributor VS Distributor Less Ignition System

Page 21: Ignition system

•No Distributor.

•Uses multiple ignition coils.

•Camshaft position sensor is installed in place of ignition distributor.

•ECM fires two coils at the same time.

•Less moving parts.

Page 22: Ignition system

Mounted directly on the plugs (Quad-4 )

No Sparkplug wires.