Describe the Function of Electronic Ignition Systems

Electricity plays a vital role in ignition systems.

Mechanical, point-type ignitions were commonplace in the early 1900s. The electronic ignition system became the normal parameter for starting a vehicle during the energy crisis of the 1970s.

Identification

Electronic ignition systems are made up of a primary and secondary circuit. The primary supports the initial start-up of the ignition switch, battery and primary coil windings. The secondary circuit supports the electronic control module, distributor cap, ignition coil and spark plugs.

Function

Turning the ignition key causes the battery to send current past the ignition switch; this energizes the primary coil windings. An armature within the coil assembly builds up power, and essentially transforms the low voltage into high voltage. This high voltage is distributed through the distributor cap and electronic control module. The voltage proceeds to the spark plugs for firing.

Significance

Electronic ignition systems allow fuel mixtures to be ignited with a stronger sparkplug flash. This results in less exhaust emissions and better mileage.

References

• Pro Car Care: Ignition System