Ignition coil
With the development of automobile gasoline engine to the direction of high speed, high compression ratio, high power, low fuel consumption and low emission, the traditional ignition device has been unable to meet the requirements of use. The core components of the ignition device are the ignition coil and the switching device, improve the energy of the ignition coil, the spark plug can produce enough energy spark, which is the basic condition of the ignition device to adapt to the operation of modern engines.
There are usually two sets of coils inside the ignition coil, the primary coil and the secondary coil. The primary coil uses a thicker enamelled wire, usually about 0.5-1 mm enamelled wire around 200-500 turns; The secondary coil uses a thinner enamelled wire, usually about 0.1 mm enamelled wire around 15000-25000 turns. 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 switching device (breaker). 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.
The reason why the ignition coil can turn the low voltage into high voltage on the car is that it has the same form as the ordinary transformer, and the primary coil has a larger turn ratio than the secondary coil. But the ignition coil working mode is different from the ordinary transformer, the ordinary transformer working frequency is fixed 50Hz, also known as power frequency transformer, and the ignition coil is in the form of pulse work, can be regarded as a pulse transformer, it according to the different speed of the engine at different frequencies of repeated energy storage and discharge.
When the primary coil is powered on, a strong magnetic field is generated around it as the current increases, and the magnetic field energy is stored in the iron core. When the switching device disconnects the primary coil circuit, the magnetic field of the primary coil decays rapidly, and the secondary coil senses a 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.
Under normal circumstances, the life of the ignition coil depends on the use of the environment and vehicle use, and generally needs to be replaced after 2-3 years or 30,000 to 50,000 kilometers.
Ignition coil is an important part of the automotive engine ignition system, its main role is to convert the low-voltage power supply of the vehicle into high-voltage electricity to ignite the mixed gas in the cylinder and promote the engine operation.
However, if it is found that the engine is difficult to start, acceleration is unstable, and fuel consumption is increased, it is necessary to check whether the ignition coil needs to be replaced in time. In addition, the replacement of the ignition coil also needs to be carried out by professional technicians to ensure that the replaced ignition coil can work normally and avoid other failures caused by improper operation.
Structure of ignition coil. The ignition coil is divided into two parts: primary coil and secondary coil. The primary coil is made of thick enamelled wire, with one end connected to the positive terminal of the low-voltage power supply on the vehicle and the other end connected to the switching device (circuit breaker).
The secondary coil is made of fine enamelled wire, one end is connected to the primary coil, and the other end is connected to the output end of the high-voltage wire to output high-voltage electricity. Ignition coil according to the magnetic circuit can be divided into open magnetic type and closed magnetic type two. The traditional ignition coil is open-magnetic, its core is made of 0.3mm silicon steel sheet, secondary and primary coils are wound on the iron core; Enclosed is the primary coil with an iron core, the secondary coil is wrapped around the outside, and the magnetic field line is composed of the iron core to form a closed magnetic circuit.
Ignition coil replacement precautions. The replacement of the ignition coil needs to be carried out by a professional technician, because improper replacement may lead to other failures. Before replacing the ignition coil, disconnect the vehicle from the power supply, remove the ignition coil, and check whether other components are damaged or aged, such as spark plugs, ignition coil coils, and ignition coil modules.
If other components are found to be faulty, they should also be replaced. After replacing the ignition coil, it is necessary to conduct system debugging to ensure the normal start and operation of the engine, and avoid abnormal situations such as start-up difficulties, acceleration instability, and increased fuel consumption.
The role of the ignition coil. The main role of the ignition coil is to convert low-voltage power to high-voltage electricity to ignite the gas mixture in the cylinder and push the engine to operate. The working principle of the ignition coil is to use the principle of electromagnetic induction to convert the low-voltage power supply of the vehicle into high-voltage electricity, so that the spark plug generates sparks and ignites the mixed gas.
Therefore, the performance and quality of the ignition coil are crucial to the normal operation of the engine. If the ignition coil fails, it will lead to difficulties in starting the engine, unstable acceleration, increased fuel consumption and other problems, seriously affecting the safety and comfort of the vehicle.
In short, the ignition coil is an important part of the automotive engine ignition system and needs to be checked and replaced regularly to ensure that the engine is working properly. When replacing the ignition coil, professional technicians are required to pay attention to check whether there are problems with other related components, and to debug the system to avoid other failures. At the same time, we should also understand the working principle and structure of the ignition coil in order to better maintain and maintain our car.
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