What is the relationship between the size of the spark and the cylinder pressure of the spark ignite

The first few are inaccurate. I understand that the size of the spark in the main text of the building should refer to the voltage at the time of ignition. A large voltage is commonly known as a large spark.

The ignition voltage of the spark plug is directly determined by the ignition coil. The coil voltage is determined by the signal of the ECU.

Generally speaking, when the pressure in the cylinder is high, the ECU will increase the ignition voltage of the ignition coil, so that the ignition voltage of the spark plug is large. Vice versa.

Therefore, the spark plug ignition spark size (ignition voltage) is directly proportional to the pressure in the cylinder.

The end of the compression stroke of the four-stroke internal combustion engine and the beginning of the power stroke are the moment when the spark plug is ignited, so the spark plug ignition when the cylinder pressure is maximum, and the size of the spark should be related to the voltage of the circuit.

The greater the pressure, the smaller the spark.

Voice coil motors and linear motors have been applied to the ignition device of spark machines.

Spark discharge is actually the process of ionizing the air between the positive and negative electrodes of the spark plug, and the main influencing factors are the density and temperature of the air in the cylinder, especially the density. The higher the cylinder pressure, the denser the air and the higher the temperature.

Regarding the ionization of air, the degree of ionization and the density of air are not linear, and neither the density of air nor the density of air near vacuum is conducive to the ionization of gas molecules. In the case of high air density, the ions formed by electrons or free electrons attached to the gas molecules accelerate in the electric field, because the gap between the gas molecules is very small, the intermolecular collisions are frequent, and the ions cannot accelerate enough kinetic energy to collide with other molecules to ionize. In the case of a near vacuum, although the charged electrons or ions can be accelerated to sufficient kinetic energy in the electric field, the probability of collision with gas molecules is greatly reduced, which is also not conducive to the ionization of the gas medium.

At normal pressure, the degree of ionization of air gradually increases as the density of the air decreases. The relationship between air ionization and temperature is manifested in the fact that the higher the temperature, the easier it is for gas molecules to be broken down by ionization.

According to the above analysis, the higher the compression pressure of the cylinder or the lower the temperature at the end of compression, the higher the ignition voltage.

The ignition performance of the spark plug directly affects the performance of the automobile engine, if the ignition performance of the cremation plug is not good, not only will it not be easy to start, the driving will feel weak, the oil and gas combustion is incomplete, the fuel consumption is high, and a large amount of exhaust gas is generated, which seriously pollutes the environment, and will seriously affect the service life of the engine.

The surface of the spark plug that works normally in use, with a clean porcelain core that is white or light brown, or has a very thin layer of brown powdery carbon deposits on the porcelain core; The electrode is intact and gray, and there is no ablation on the surface; The front end of the thread body is dry, and the surface is brown or maroon-red.

Answer: The higher the calorific value, the faster the heat dissipation, the lower the temperature of the spark plug, the ignition head produces carbon deposits, causing power run, and the spark plug cannot jump out of the fire;

If the calorific value is too low and the heat dissipation is insufficient, the temperature of the spark plug will be too high, which will lead to deflagration, etc., which will easily cause the ceramic of the spark plug head to be burned and the electrode to be dissolved.

Answer: After the spark plug has been used for a period of time, it may be a little difficult to disassemble one or more spark plugs, so it will be easier to disassemble it after the engine has cooled down sufficiently. If the spark plug is too tight, you can also use kerosene or loosening agent to drop on the spark plug washer and thread, rotate the spark plug smoothly and vigorously until the spark plug is loose, and blow off the dirt around the spark plug before removing the spark plug, so that after the spark plug is screwed out, the dirt falls into the combustion chamber, and the sleeve can not be tilted, otherwise it is easy to damage the spark plug insulator.

1. Pay attention to aligning the thread. In particular, the spark plug hole is deep, and special tools are required, and if the resistance is greater when screwing in, it is necessary to avoid blind force, so as not to mess up the thread and cause damage.

2. When tightening the spark plug, the torque should be in line with the technical specifications, and the torque should not be too loose or too tight, so as not to leak air or damage the spark plug and spark plug hole.

3. When installing the sub-cylinder line, it should be firmly connected to prevent false connection.

1. Check whether the gap between the flower plugs meets the requirements.

2. Check the spark plug skirt for pollution and carbon deposits.

3. Check whether the side electrode is damaged and whether the central electrode is leaking.

4. Check whether the spark plug insulator is cracked or damaged.

5. Check whether there is loose air leakage between the core of the insulator and the shell.

6. Check whether the spark plug sealing gasket is leaking.

7. Carry out the flashover test.

Voice coil motors and linear motors have been applied to the ignition device of spark machines.

The spark plug dissipates heat quickly! The higher the calorific value of NGK, the faster the heat will be dissipated. Denso's the opposite.

First, the compression ratio is an important parameter to measure the performance index of the automobile engine, generally speaking, the larger the compression ratio, the higher the gasoline grade required. On the contrary, it will cause problems such as cylinder knocking, intensified engine vibration, uneven driving, etc., which will also damage the engine performance and shorten the service life.

Second, the concept of compression ratio:

1. The ratio of the maximum volume of the cylinder at the bottom dead center to the minimum volume of the cylinder at the top dead center is the compression ratio.

2. Suppose a cylinder, the bore is 84mm, the stroke is 90mm, the piston area is about to take into account the gap, the actual value should be smaller), the displacement is, if the top combustion chamber volume is known, then the compression ratio can be obtained as 10:1, the same conversion, if the compression ratio is 12, then the top combustion chamber volume is.

Second, the reason for setting the compression ratio.

Because the increase in pressure can make the density of the gas larger, the distance between the molecules will be smaller, so that the fuel molecules and oxygen molecules will be closer together, and the combustion rate will be faster; Temperature allows gas molecules to move faster, making it easier for fuel and oxygen molecules to interact with each other, which makes gas mixtures easier to ignite. Moreover, the smaller combustion space can complete the combustion faster, and the faster combustion process also improves the performance.

Independent ignition, English for coil-on-plug, referred to as Chinese literal translation as "coil on the spark plug", the coil is directly installed on the spark plug, that is, a cylinder an independent coil, commonly known as "independent ignition".

Principle: The working principle of COP is basically the same as that of other ignition systems. Each coil has a low impedance that allows the primary voltage to be up to 40,000 volts to cause the spark plug to spark.

The real difference between COP and other ignition systems is that each COP coil is mounted directly on the spark plug and the voltage goes directly to the spark plug electrodes, rather than through a distributor or a high-voltage ignition wire. This connection method allows the spark to be as strong as possible and increases the reliability of the ignition system.

The use of separate coils for each spark plug means that the coils take longer between ignition. Increasing the "coil flux" time (the time when the coil voltage builds up the coil magnetic field) increases the voltage output of the coil at high rotational speed (rpm); A lack of fire is most likely to occur at high rpm.

The main thing is:

1 Fuel oil, such as lead, manganese-containing metals, and water.

2. The spark plug itself is electrocuted down, resulting in leakage of high-voltage electricity, leakage of the cylinder line, insufficient ignition of the ignition coil 3, and finally the incorrect timing of the valve affects the ignition time.

The main and most common is the breakdown voltage. It's not as complicated as it says upstairs.

Excluding other factors, --- ignition effect in 4 words.

In terms of ignition effect, it is better and more fuel-efficient.