The function of the IGNITION COIL is to turn the low-voltage electricity on the car into a high-voltage electric spark, and then ignite the mixed gas in the cylinder. It works like a lighter that you usually use. An additional resistor in the ignition coil low voltage circuit has the effect of balancing high voltage sparks. A magnetic field is generated when current is passed through the primary coil, and it takes a period of time from the start of the current to the saturation of the magnetic field (ie, to the highest extent). At low engine speeds, the magnetic field can reach saturation. When the engine is at high speed, the time is shortened, the magnetic field cannot reach saturation, the secondary voltage generated will be insufficient, and the spark will be weakened.
The principle of the ignition coil:
A typical ignition coil has two sets of coils, a primary coil and a secondary coil. The primary coil is made of a thicker enameled wire, usually about 0.5-500 mm with an enameled wire of about 0.5-1 mm; the secondary coil is made of a thin enameled wire, usually about 15,000-25,000 inches with an enameled wire of about 0.1 mm. One end of the primary coil is connected to the low voltage power supply (+) on the vehicle, and the other end is connected to the switch device (disconnector). One end of the secondary coil is coupled to the primary coil, and the other end is coupled to the output of the high voltage line to output high voltage power.
The reason why the ignition coil can turn the low voltage of the vehicle into a high voltage is because it has the same form as the ordinary transformer, and the primary coil has a larger turns ratio than the secondary coil. However, the working mode of the ignition coil is different from that of the ordinary transformer. The working frequency of the ordinary transformer is fixed 50Hz, also known as the power frequency transformer, and the ignition coil works in the form of pulse. It can be regarded as a pulse transformer, which is different according to the engine. The speed is repeatedly stored and discharged at different frequencies.
When the primary coil is powered on, a strong magnetic field is generated around the current, and the core stores the magnetic field energy; when the switching device disconnects the primary coil circuit, the magnetic field of the primary coil is rapidly attenuated, and the secondary coil is Will induce a very high voltage. The faster the magnetic field of the primary coil disappears, the larger the current at the moment of current disconnection, and the higher the turns ratio of the two coils, the higher the voltage induced by the secondary coil.
The ignition coil is divided into an open magnetic type and a closed magnetic type according to the magnetic circuit. The conventional ignition coil is an open-magnetic type, the core of which is laminated with a silicon steel sheet of about 0.3 mm, and the core is wound with a secondary and primary coil. In the closed magnetic mode, a core similar to III is used to surround the primary coil, and the outer coil is wound around the secondary coil. The magnetic lines of force form a closed magnetic circuit from the iron core. The advantage of the closed magnetic ignition coil is that the magnetic leakage is small, the energy loss is small, and the volume is small. Therefore, the electronic ignition system generally adopts a closed magnetic ignition coil.
If the ignition coil is used improperly, it will cause damage to the ignition coil. Therefore, pay attention to the following points: Prevent the ignition coil from being heated or damp; do not open the ignition switch when the engine is not running; often check, clean, tighten the line connector to avoid short circuit or Grounding; control engine performance to prevent excessive voltage; SPARK PLUGs must not be "suspended" for a long time; the moisture on the ignition coil can only be wiped dry with a cloth, and must not be baked with fire, otherwise the ignition coil will be damaged.
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