What is the function of the car ignition coil
The main role of the automotive ignition coil is to convert the low voltage provided by the vehicle battery into a high voltage to generate an electric spark that ignites the fuel mixture in the engine cylinder . Specifically, the ignition coil works through the principle of electromagnetic induction, converting low-voltage electricity into high-voltage electricity, ensuring the normal operation and smooth combustion of the engine .
Working principle
The ignition coil works like a transformer, but has its own uniqueness. It is mainly composed of primary coil, secondary coil and iron core. When the primary coil is powered on, the increase in current creates a strong magnetic field around it, and the iron core stores the magnetic field energy. 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 ratio of turns between the two coils, the higher the voltage induced by the secondary coil .
Fault performance and impact
If the ignition coil is faulty, it will cause the spark plug to fail to ignite normally, which will affect the normal operation of the engine. The specific performance includes the vehicle cannot start normally, the idle speed is unstable, the acceleration is poor, and the fault light is on. In addition, the ignition coil is broken will also lead to engine vibration, weak acceleration, high-grade do not go up the symptoms .
Maintenance and maintenance advice
Since the ignition coil plays a vital role in the work of the car engine, its maintenance and maintenance are also very important. Avoid exposing the ignition coil to high temperatures to avoid mechanical and electrical damage. If the ignition coil is found to be faulty, it should be replaced in time to ensure the normal operation of the engine .
When the ignition coil of an automobile is damaged, the following steps should be taken to repair and replace :
Check the voltage and resistance : First, turn the ignition switch to ON, remove the wiring harness connector of the ignition coil, and use a multimeter to check whether there is about 12V voltage between pin No. 3 on the connector and the ground cable. If there is no voltage, check the related lines. At the same time, check whether there is a short circuit or open circuit between pin No. 1 and pin No. 5 of the ECU and pin No. 2 of the ECU. In addition, measure whether the primary coil resistance of the sensor is about 0.9Ω and the secondary coil resistance is about 14.5kΩ. If these values are not met, consider replacing the ignition coil.
Detection waveform : The oscilloscope is used to detect whether the secondary ignition waveform of the high voltage line of the ignition system is in a normal state. If the waveform is abnormal, the ignition coil may need to be replaced.
Replace the ignition coil : When replacing the ignition coil, be sure to choose the coil that matches the model, and do not mistakenly think that all the coils of the same voltage are universal. In addition, daily preventive measures are also very important, such as regular inspection, cleaning and tightening of line connections to avoid short circuits or grounding problems; Adjust engine performance to prevent excessive voltage; And avoid exposing the ignition coil to excessive heat or humidity.
Causes of ignition coil damage may include :
Aging : The ignition coil will gradually age during use, resulting in reduced performance.
overheat : working at high temperature for a long time may cause damage to the ignition coil.
humid environment : humidity may cause corrosion of internal components of the ignition coil, affecting its normal operation.
Circuit problems : A short circuit or open circuit may also cause damage to the ignition coil.
Preventive measures : Check the status of the ignition coil regularly, keep its working environment dry, avoid overheating, and regularly clean and tighten the line connection to extend its service life.
If you want to know more, keep reading the other articles on this site!
Please call us if you need such products.
Zhuo Meng Shanghai Auto Co., Ltd. is committed to selling MG&750 auto parts welcome to buy.
