Ignition System Intro Flashcards
3 things needed for an engine to start?
Fuel, Air, and Ignition
Units of electricity
Voltage- push of electrons
Amperage- the movement of electrons
Resistance- property of a conductor to restrict electron flow
Purpose of ignition systems
Provide a large instantaneous voltage to push a small amperage across a spark plugs air gap causing ignition of the fuel/air mixture.
Types of ignition systems
Battery, Magneto, Full Authority Digital Engine Control (FADEC), and High Energy Capacitor Typr
Battery ignition system
Similar to vehicles and rarely used on a/c. A battery or generator serves as the source of energy.
Magneto Ignition System
Uses a permanent magnet as the source of energy. The magneto develops high voltage by electromagnetic induction forcing a spark to jump across the spark plug air gap in each cylinder. Two types: high and low tension
Components of the ignition system
Magnet, Coil, Distributor, Ignition Harness, and spark plugs.
FADEC
Provides optimum engine efficiency for a given flight condition. It’s a solid-state ignition system consisting of a digital computer, called an electronic engine controller (EEC) or engine control unit (ECU), and its related accessories that control all aspects of aircraft engine performance.
High Energy Capacitor Type
Has two independent ignition units operating from a DC electrical power source: the aircraft battery, 115 AC, or permanent magnet generator. The generator is turned directly by the engine through the accessory gear box and produces power any time the engine is turning.
Faradays Law
Any change in the magnetic environment of a conductor will cause a voltage (EMF) to be “induced” in the conductor. No matter how the change is produced, the voltage will be generated.
