from the main coil、Secondary coils、magnetic core、Switching triode and other auxiliary original composition，The main coil is charged by the battery，Substation coil discharge spark plug ignition，The triode is responsible for switch。Charging time is controlled by battery voltage and engine speed control、Make sure that each charging energy is consistent，The ignition coil has 3 lines and 4 lines，3 lines are positive power supply、negative、Switching control (ECU instruction)，4 lines have an additional ignition detection line，Can detect whether the spark plug ignition (whether there is a discharge current in the secondary coil)。 Say simple，ignition coil is a transformer，That is to raise dozens of volts to tens of thousands of volts，It's just that the voltage of the entering primary coil is provided by an electronic ignition。
2. Reasons for burning the ignition coil
The reason for burning the ignition coil is the main reason is the aging layer of the insulating layer or the switching of the triode damage，Spark plug gaps will cause the main coil load to be large、Hot、Essential layer aging fast，Small spark plug gaps lead to large secondary discharge current、Hot、Essential layer aging fast，The assembled ignition coil may have poor durability for insulation materials、Internal resistance of the coil、The quality of the third -level tube is not high. The life span will be shorter。 If it is always burned out，I will burn out soon after replacement，What is the reason for this，The following summarizes: 1. First look at the problem of the generator，If the power generation is too high，If the load of the ignition coil is too heavy, it is easy to burn bad，But if it is really high power generation，So body appliances，For example, bulb, etc.，It will often be damaged; of course, it does not seabet iorule out the quality problem of accessories，So it is best to test the power generation。2. The spark plug space is too large，Adjust the gap or replace the spark plug; 3. Poor gasoline quality，Try the gasoline with a high label; 4. The cylinder compression ratio is not right，Adjust the compression ratio; 5. Program failure in the computer board，You can check the car at the repair plant with a computer，Just remove the error information。If not,，It may be that your car drives have problems。6. Unstable power supply voltage; 7. The resistance of the high -voltage line is abnormal，Replace the high -voltage line; 8. There is a short circuit in the secondary level;，High -pressure waves have problems with problems.，You can try to change the brand; 12. Fire integrated block work; The ignition coil itself is a transformer，This is like a transformer in domestic appliances，When the voltage changes within the specified range，Is it not burn the transformer，Usually the burning transformer appears when the transformer load is overweight, this is the case，So when solving this problem。
3, detection method
Casthaft position sensor (CKP) and camshaft position sensor (CMP) detection normal，But there is no high pressure fire，Usually a ignition coil component power supply wire disconnection。 (1) Test with high impedance multimeter and light emitting diode:，First unplug the 4 -channel ignition coil junior winding plug，Use high impedance universal meter to detect 3 to 4 holes，The voltage should not be less than 11 V。Then at 1 respectively、4 holes and 3、4 holes connect to the light -emitting diode，When the engine starts, the light glowing diodes are not shiny，Explain that there is no low -pressure signal，Should check the low voltage circuit。Power transistor failure will affect the ignition control signal，The power transistor is the ignition control signal amplifier，Disted ignition switch，Connect the emitted diode between the battery positive electrode and the power transistor terminal A，Start the engine，Make it 10s，If the glowing diodes are not bright，Should be replaced with a power transistor。 (2) Resistance value test: The high and low resistance value of the ignition coil is directly related to the good or bad of the ignition performance，If there is no fire or a spark weakness，Keep checking the primary winding、A resistance value of the secondary winding，Unplug the high -voltage line of each cylinder，During 20 ° C, measure 1、Between 4 cylinders，3、The resistance value between 4 cylinders。If the resistance value explains normal within the scope of the manufacturer's regulations，If the resistance value is too low, the internal short circuit is explained;。If the measurement value is not in line with the manufacturer's regulations, it must be replaced。 (3) The main feature of the ignition coil is to be damaged is that the ignition coil is heated、Spicy。 (4) Traditional car inspection ignition coil failure is mainly to see high -pressure jumping fire，Under the premise of normal low -voltage circuits，There is no failure such as the ignition coil，It should be a strong blue spark when jumping fire。The ignition coil of electronic fuel injection is mainly to measure the impedance of the primary and secondary winding and use the light -emitting diode to test the circuit。 (5) If you find that a cylinder spark plug is not fire or poor work，It can remove the cylinder high -voltage division，Connect a new spark plug，jump fire at 8mm at the outer distance of the cylinder，As normal，Explain the fault in the original spark plug。 Suddenly there is no fire or spark weakness during driving，You can use an infrared temperature measuring meter or touch to determine whether the ignition coil or the ignition module produces internal short circuit or disconnect failure。When judging the fault，You can also restart，Whether it can be started，You can measure the temperature of the ignition coil shell for judgment。 ① Overheating of ignition coil: The surface temperature of the ignition coil is greater than 95 ° C，Explain short circuit inside the ignition coil，Must be replaced。 ② Strifice coil is too cold: the surface temperature and ambient temperature of the ignition coil at seabet mythe time of launch，Explain the internal interruption of the ignition coil，Must be replaced。 ③ The ignition module is overheating: the ignition module temperature is higher than 100 ℃，Explain short circuit inside the ignition module，Must be replaced。 ④ The ignition module is too cold: the ignition module and the ambient temperature of the ignition module are equal when starting，Explain internal disconnection of the ignition module，Must be replaced。(Photo derives from the Internet，If you involve the copyright, please contact delete)
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