Automobile knowledge sharing-the structure and type of ignition coil by Asiautos Auto Parts(CHINA CAR Aftermarket Parts Expert)

Edited by Asiautos Auto Part

The ignition coil is a key component in the ignition system of an automobile engine. Its main function is to convert low-voltage electricity into high-voltage electricity to ignite the spark plug, thereby realizing the ignition process.

1. Basic composition :

• Iron core : It is made of stacked silicon steel sheets, the sheets are separated by insulating materials, and the outer layer is covered with an insulating sleeve to enhance the magnetic flux.

  

• Winding :

• Additional components : including bakelite covers, porcelain cups, insulating paper, asphalt or transformer oil, etc., used to enhance insulation and prevent moisture intrusion.

2. Special design :

• Open magnetic circuit ignition coil : uses a cylindrical iron core, has low conversion efficiency, but has a simple structure and is suitable for traditional ignition systems.

• Closed magnetic circuit ignition coil : The iron core is in the shape of a "mouth" or a "sun", the magnetic lines of force are closed, the energy conversion efficiency is high, the size is small, the weight is light, and it is suitable for modern high-energy contactless ignition systems.

1. Classification by magnetic circuit structure :

• Open magnetic circuit ignition coil : suitable for traditional contact ignition system, with simple structure and low cost, but large magnetic leakage and low efficiency.

  

• Closed magnetic circuit ignition coil : suitable for modern electronically controlled ignition systems, with the advantages of high energy conversion efficiency, small size and light weight.

Classification by working method :

• Independent ignition mode : Each cylinder is equipped with an ignition coil, which is suitable for multi-cylinder engines and can improve ignition efficiency and engine performance.

• Simultaneous ignition mode : multiple cylinders share one ignition coil, which is suitable for engines with few cylinders, but the ignition efficiency is low.

1. Classification by cooling method :

• Oil-immersed ignition coil : cooled by oil, suitable for traditional ignition systems, but with large magnetic leakage and low efficiency.

• Dry ignition coil : air cooling, better heat dissipation performance and higher conversion efficiency.

2. Classification by connection method :

• Three-terminal type : An additional resistor is installed on the housing to improve ignition performance.

• Two-terminal type : no additional resistance, simple structure.