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Type of ignition systems in IC Engine

The ignition system is the most important part of the SI engine (Spark Ignition Engine). The ignition system an important system used in the Internal Combustion engine. Ignition system used to ignite air-fuel mixture at the proper time and in a well suitable manner with the wild range of engine speed.

Battery Coil Ignition System

  • The essential component of the battery ignition system is,
    • Battery 
    • Ignition switch
    • Distaibıde
    • Ignition coil with ballast resistor
    • Spark plus
  • The ignition switch provided connects and disconnects the ignition system from the berry so, the engine can be started or stopped.
  • When the ignition catch is on, the contact breaker points are closed, then the current to flow from the battery through the primary winding of the ignition back to the battery through earthing.
  • It developer o magnetic field across the primary winding of the ignition and inducer back which oppose the battery current.
  • A voltage is always induced in the secondary winding load but emf is too low to produce a spark. 
  • The resulting induced current still flows in the same direction as the battery current and it charges the condenser.
  • The flow of current is reversed when the battery voltage becomes less than the voltage across the condenser plates.

FIG: Battery Coil Ignition System


Magneto Ignition System

  • The principle of working of this system is similar to the battery coil ignition system, except that the magnetic field is primary and secondary winding introduced by rotating permanent magnet.
  • Magnet revolves around a rapid change of magnetic flux.
  • Magneto flux varies from a positive to maximum -ve and back up the rapid vibration of the magnetic field induced.
  • This rate of change of flux is not rapid enough to induce high voltage for sparking. Hence, the broker points condenser is provided into the circuit.

FIG: Magneto Ignition System
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