How does an ignition coil work?

The working principle of the ignition coil: the ignition coil works in a different way than the ordinary transformer, the ordinary transformer works continuously, while the ignition coil works intermittently, and it repeatedly carries out energy storage and discharge at different frequencies according to the different speed of the engine.

When the primary coil is connected to the power supply, a strong magnetic field is generated around it as the current increases, and the iron core stores the magnetic field energy; When the switchgear disconnects the primary coil circuit, the magnetic field of the primary coil decays rapidly, and the secondary coil induces a very high voltage. The faster the magnetic field of the primary coil disappears, the greater the current at the moment of current disconnection, and the greater the turn ratio of the two coils, the higher the voltage induced by the secondary coil.

With the development of automobile gasoline engines in the direction of high speed, high compression ratio, high power, low fuel consumption and low emissions, the traditional ignition device has not adapted to the requirements of use. The core components of the ignition device are the ignition coil and the switchgear, and the spark plug can produce a spark with sufficient energy to increase the energy of the ignition coil, which is the basic condition for the ignition device to adapt to the operation of modern engines.

The ignition coil is composed of the main coil, the secondary coil, the magnetic core, the switching triode and other auxiliary components, the main coil is charged by the battery, the secondary coil is discharged and the spark plug is ignited, and the triode is responsible for switching. The charging time is controlled by the battery voltage and engine speed to ensure that the energy of each charge is consistent, the ignition coil has two kinds: 3 wires and 4 wires, 3 wires are positive and negative for the power supply, and the switch controls the ECU instruction, and the 4 wires have an additional ignition detection line, which can detect whether the spark plug is ignited and whether there is a discharge current in the secondary coil.

To put it simply, the ignition coil is a transformer, that is, the voltage of tens of volts is raised to tens of thousands of volts, but the voltage input to the primary coil is provided by the electronic ignition.

2: The reason why the ignition coil burns out.

Mainly the aging breakdown of the insulation layer or the damage of the switching triode, the large spark plug gap will lead to the main coil load, large heating, fast aging of the insulation layer, small spark plug gap leads to large discharge current of the secondary coil, fast heating, fast aging of the insulation layer, the assembled ignition coil may have poor durability of insulating materials, large internal resistance of the coil and fast heating, and the life of the transistor will be shorter if the quality is not high.

If it is always burned out, and it burns out soon after replacement, and why?

Let's take a look at the problem of the generator first, if the power generation is too high, the load of the ignition coil is too heavy, it is easy to burn out, but if the power generation is too high, then the body electrical appliances, such as light bulbs, will often be damaged; Of course, the quality of the accessories is not ruled out, so it is best to measure the power generation first.

If the spark plug gap is too large, adjust the gap or replace the spark plug.

The quality of gasoline is not good, try to change to high-grade gasoline.

If the compression ratio of the cylinder is wrong, adjust the compression ratio.

If there is a program failure in the computer version, you can go to the repair shop and use the computer to test the car and clear the wrong information. If it doesn't work, it may be that there is a problem with your car's transmission.

The power supply voltage is unstable.

The resistance of the high voltage is abnormal, replace the high voltage line.

There is a short circuit in the secondary.

The ignition coil is overheated due to the high primary current of the ignition controller.

It does not work well when subjected to high temperature and high pressure waves.

There is a small chance that it is a problem with the coil itself, so you can try a different brand.

The ignitor manifold does not work well.

The application of the automobile ignition coil is actually the principle of electromagnetic induction transformer, and the only difference between the ignition coil and it is that the work of the transformer is continuous, while the ignition coil is intermittent, and the ignition coil will store and discharge energy repeatedly at a certain frequency according to the different working speed of the engine.

The ignition coil is sold by using broken fiber to work simply, can produce enough energy for the engine, is a kind of switching device, as long as the ignition coil of the vehicle works normally, the engine can produce a certain spark, which is a necessary condition for the operation of the vehicle engine. The ignition coil is composed of a trip computer, a sensor and an ignition actuator.

How it works

When the ignition system switchgear turns on the primary coil (low voltage), the iron core is magnetized as the current passes through the low voltage coil, resulting in a strong magnetic field around it, and the iron core stores the magnetic field energy. When the switchgear disconnects the primary coil circuit, as the magnetic field of the primary coil disappears instantly, the core is demagnetized, and the magnetic field lines rapidly shrink and cut the secondary coil (high voltage), so that the secondary coil induces a very high voltage.

Gasoline engine to high speed and high compression, high power and low fuel consumption direction to develop, the traditional use of ignition device has been not applicable, the core components of the ignition device is the ignition coil and switchgear, improve the energy of the ignition coil spark plug can produce enough sparks, this is the ignition device to adapt to the basic conditions of modern engine. Big tease.

<> to understand how the ignition coil works, let's take a look at its structure. There are two sets of coils in the usual ignition coil, the primary coil and the secondary coil. The primary coil uses thicker enameled wire, usually about 200-500 turns of enameled wire about millimeters; The secondary coil uses a thinner enameled wire, usually about 15000-25000 turns with about millimeter enameled wire.

One end of the primary coil is connected with the low-voltage power supply (+) on the vehicle, and the other end is connected with the switchgear (cut-off). One end of the secondary coil is connected with the primary coil, and the other end is connected with the output end of the high-voltage line to output high-voltage electricity.

The ignition coil can turn the low-voltage electricity on the car into a high-voltage voltage because it has the same shape as the ordinary transformer, and the primary coil has a larger number of turns than the secondary coil. However, the ignition coil works in a different way than the ordinary transformer, the working frequency of the ordinary transformer is fixed at 50Hz, also known as the power frequency transformer, and the ignition coil works in the form of hand and pulse, which can be regarded as a pulse transformer, which repeatedly carries out energy storage and discharge at different frequencies according to the different speed of the engine.