Principles of spark plug technology
How does a spark plug work? This article will take you to take a closer look, and interested partners can pay attention to it and take you to the mystery of automotive technology.
The spark plug is an important component of the ignition of the gasoline engine, also known as the fire nozzle, its function is to discharge the pulse high-voltage electricity sent by the high-voltage wire, penetrate the air between the two electrodes of the spark plug, and generate an electric spark to ignite the combustible mixed gas in the cylinder.
First, when a spark plug produces a spark, it requires between 15 and 21,000 volts, whereas there is only one 12-volt battery on the car. So what about getting such a large voltage from **? The key point is the ignition coil, which converts 12 volts into a very high voltage.
There is an iron core in the middle of the coil, just like this type of coil. The primary coil first winds 200 to 300 turns around the core, and at first the battery supplied only 12 volts to the primary coil. There are two functions to amplify the voltage, the first is to connect the capacitor and the contact circuit breaker together to amplify the voltage of the primary coil from 12 volts to 300 volts. The second is that there is a secondary coil in the middle of the primary coil, and the number of turns of the secondary coil is 21,000 turns, which is to amplify the voltage again.
In this way, the ignition coil raises the voltage from 12 volts in the battery to 21,000 volts and transmits this voltage to a spark plug placed on the top of the cylinder, which has a center in the middle and an electrode made of nickel or platinum, through which the voltage flows through which 21,000 volts flow.
Around the electrode there is also an insulator made of alumina ceramic, which can withstand high pressures and temperatures. When a spark is generated by the spark plug, the combustible mixture burns inside the cylinder, causing **. The compressed gas produces a reciprocating inertia force on the piston, and the downward movement of the piston exerts a force on the crankshaft, and the crankshaft begins to rotate. This force also acts on the spark plug when ** occurs in the cylinder. In order to prevent gas leakage inside the cylinder, the insulator must have the characteristics to withstand high pressures and temperatures. The insulator is surrounded by a grounding electrode made of iron. There are threads around the grounding electrode that are used to fasten the spark plug above the cylinder.
There is a small gap between the central electrode and the ground electrode, because the central electrode is positive. The grounding electrode is the negative electrode, the grounding electrode is in contact with the cylinder, the cylinder is in contact with the engine, and the engine is in contact with the body. This eliminates the need for separate wiring for the negative pole. Because the body itself acts as a negative wire, there is a high voltage in the spark plug, and if the negative wire is brought close, this voltage does not need to be touched, and sparks will be generated at a distance.
Hot Spot Engine Plan So when the mixture of air and fuel in the cylinder is compressed upwards, power is supplied to the spark plug, and once the power is supplied, a huge spark is generated, and this spark instantly ignites the combustible mixture, and at the same time the power supply is stopped. This cycle creates an electric spark, which is how the spark plug works.
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