What are the detonation, detonation and deflagration?

What is engine super knocking.

Engine "super knocking", also known as low-speed premature ignition, is an abnormal combustion phenomenon unique to supercharged direct-injection gasoline engines. When the engine inhales the mixture of fuel vapor and air, in the process of compression, due to the mixture of low ignition point substances in the fuel, it will cause the gas mixture to automatically deflagrate before the ignition of the spark plug, forming a new ignition point, and the flame spreads outward at a speed several times higher than the normal combustion, so that the cylinder wall is affected and vibrates, which is called detonation. To put it simply, knocking is a manifestation of abnormal pressure in the combustion chamber caused by abnormal combustion.

A phenomenon when detonation occurs.

The engine will emit a crisp and discontinuous metal knocking sound when a slight knock occurs, while a continuous metal knocking sound will occur when the engine will have a continuous metal knocking sound during a severe and continuous knock, and the engine power will also be significantly reduced.

What are the causes of detonation?

1 The air-fuel ratio is incorrect, and the mixture is too dilute to increase the combustion temperature, thereby increasing the engine temperature.

2. The octane number of fuel is too low, the octane number is an indicator of anti-detonation, the higher the octane number, the stronger the anti-detonation, and the lower the conversely, it is easy to detonation.

3. The cleanliness of the fuel is insufficient, and some physical substances and chemical impurities contained in the fuel, including some aromatic substances, will cause spontaneous combustion and detonation during the compression process of the engine.

4. Excessive carbon deposition in the combustion chamber, due to the serious carbon deposition, the actual volume of the cylinder becomes smaller, the compression ratio increases, and at the same time, the carbon deposition in the high-temperature environment will always burn red due to the poor heat dissipation ability, so that the high-temperature compressed mixture is not only ignited by the sequential spark plug, but also randomly ignited by the high-temperature carbon deposition in the cylinder, resulting in detonation.

5. The engine temperature is too high, the engine is too hot in the environment, the inlet air temperature is too high, or the engine cooling water circulation is poor, which will cause the engine to detonate at high temperature.

6 The ignition angle is too early, so that the piston can gain power as soon as it enters the power stroke after the compression stroke is completed, it is usually ignited before the piston reaches the top dead center. Ignition too early will cause most of the oil and gas to burn when the piston is still compressing the stroke, and the unburned oil and gas will be subjected to great pressure and spontaneous combustion, resulting in detonation.

The methods to solve detonation are as follows.

1. Use fuel that conforms to the compression ratio of the engine.

2. Avoid "drag gear" driving.

3. Regularly clean the carbon deposits and fuel injectors in the oil circuit.

4. Avoid high temperatures: check the coolant water level regularly, check and change the engine oil regularly, avoid long-term intense driving, and monitor the water temperature frequently when driving in summer.

5. Appropriate selection of high-quality fuel additives. For example, fuel additives containing PNF stock solution can solve the problem of engine knocking to a certain extent.

It is an abnormal pressure in the combustion chamber caused by detonation and abnormal combustion. In a gasoline engine, when the mixture (the air and fuel are well mixed in the intake stroke) enters the combustion chamber, the piston compresses it during the compression stroke, and the spark plug ignites the high-pressure mixture, and the pressure generated by its combustion is converted into power for the engine to operate. Although the combustion of the engine can be described in a simple way, I don't know how many PhDs and masters have been created by the combustion research of the internal combustion engine alone, and even many scholars and engineers have spent their lives studying the knowledge of combustion, so it takes a lot of time to really understand the engine.

Because the combustion of the engine is very complex, it needs to be quite precise in design and control. The slightest miscontrol or disorder can cause abnormal combustion, and "detonation" is abnormal combustion. It is an abnormal pressure in the combustion chamber caused by detonation and abnormal combustion.

1. The ignition angle is too advanced:

In order for the piston to gain power as soon as it enters the power stroke after the end of compression top dead center, it is common to ignite the piston before it reaches the top dead center (because it takes some time from ignition to complete combustion). The ignition too early will make most of the oil and gas have burned when the piston is still compressing the stroke, and the unburned oil and gas will spontaneously ignite under the great pressure of Zaoling, causing detonation.

Second, the engine is overly carbonized

Excessive carbon deposition in the combustion chamber will not only increase the shrinkage ratio of the rock pie per mu (produce high pressure), but also produce high temperature hot spots on the surface of the carbon deposit, causing the engine to detonate.

3. The engine temperature is too high

If the engine is too hot, the inlet temperature is too high, or the engine cooling water is poorly circulated, which will cause the engine to detonate due to high temperature.

Fourth, the air-fuel ratio is incorrect:

Too thin the fuel-air mixing ratio will increase the combustion temperature, and the increase in combustion temperature will cause the engine temperature to rise, of course, it is easy to knock.

Detonation is the main abnormal combustion of gasoline engines, which mostly occurs when the compression ratio is high or high. When it appears, the engine produces a high-frequency metal knocking sound, so it is also called cylinder knocking.

When the detonation is slight, the engine power rises slightly, and when the power and speed are severe, the work is unstable, the engine shakes seriously, and will overheat the engine and emit black smoke.

The meaning of engine detonation is as follows: 1. The so-called detonation, simply put, is that when the mixture is still in the compression process and the spark plug has not yet jumped, the high-pressure mixture reaches the spontaneous combustion temperature and begins to burn violently. 2. Most of the detonation phenomenon occurs while increasing the compression ratio, and it is easy to produce detonation if the ignition advance angle is too large or the mixture burns too fast. Since these factors are important means of increasing engine power, knocking is an obstacle to technological progress in this area; 3. Compared with normal combustion, the degree of compression of the mixture during detonation, the combustion speed is very fast and produces high distemper and high pressure, accompanied by the combustion phenomenon.

Acre belt with strong detonation will reduce the power output of the engine. The pressure wave generated by the knock hits the top surface of the cylinder head and piston, producing a metal clattering sound and a sharp rise in the temperature of the parts in the combustion chamber.

It is the abnormal pressure in the combustion chamber caused by detonation and abnormal beam combustion.

In a gasoline engine, when the mixture (air and fuel are fully mixed) enters the combustion chamber during the intake punch pin, the piston compresses it in the compression stroke, and after the spark plug ignites the high-pressure mixture, the pressure generated by its combustion is converted into the power of the engine.

Although the combustion of an engine can be described in a few words, the combustion research of the internal combustion engine alone does not know how many PhDs and masters** have been created, and there are even many scholars and engineers who have spent a lifetime studying the knowledge of combustion, so it takes a lot of time to truly understand the engine.

Because the combustion of the engine is very complex, it needs to be designed and controlled with considerable precision. The slightest miscontrol or disorder can cause abnormal combustion, and "detonation" is abnormal combustion. It is the abnormal pressure in the combustion chamber caused by detonation and abnormal combustion.

Millions of car purchase subsidies.

Automobile engine knocking is also the meaning of knocking the cylinder, which is what we call knocking the cylinder. This is an abnormal working condition of the engine.

When the engine detolates, the engine will produce a rhythmic, slight and continuous crisp sound of "click", similar to the sound of metal knocking, especially when the throttle is wide open at high speeds, or when climbing, the sound will be louder, and the engine will also be noticeably weak. If we look at Wu Min from the loudness of his voice, we can know the severity of the detonation.

Causes of engine knocking:

1. The fire angle is too advanced: in the process of engine work, if the relevant timing is advanced or the ignition time is wrong, it will lead to the phenomenon of detonation, which is the need to check the timing of the engine!

2. Excessive carbon deposition in the engine: excessive carbon deposition in the combustion chamber of the engine will not only increase the compression ratio, but also cause high temperature hot spots on the surface of the carbon deposition, resulting in engine detonation.

3. Overheating and high temperature of the engine: poor circulation of engine cooling water, and the temperature of the intake air will be too high in the high temperature environment of the engine, which will cause the engine to detonate at high temperature.

4. The octane number of gasoline is too low: the octane number is the indicator of fuel detonation resistance, the higher the octane number, the stronger the detonation resistance. Engines with high compression ratios have higher pressure in the combustion chamber, and are prone to knocking if fuel with low knock resistance is used.

Cars are the usual means of transportation that people use when they travel. For car owners, if the car is not properly maintained or the driving mode is not right, it will lead to some problems in the car. If something goes wrong with the car at high speeds, it will be very dangerous.

Many people don't know what's going on, and they don't know what to do when the car blows up.

Automobile cylinder** refers to the high temperature of the engine, which causes the piston to expand and deform, and get stuck in the cylinder, resulting in the engine being scrapped. When the cylinder of the car is severe**, the piston cannot move due to excessive pressure, resulting in a thick flame.

Once the gasoline and gas mixture has entered the combustion chamber, the combustion process is very complex and requires fairly precise design and control. If there is a control error or disorder, it will cause abnormal combustion, and "bursting" is abnormal combustion. To put it simply, the air chamber is abnormal combustion resulting in abnormal combustion pressure.

Chain stupid. The reason for the car cylinder**.

The first is a design flaw. The cylinder burst of the car is often caused by the quality of the car. The design of the car is flawed, and the engine does not dissipate heat well, causing the engine to be heated beyond the maximum temperature it can withstand, resulting in the engine**.

The second is insufficient lubrication. As we all know, motor oil can act as a lubricating agent. If the oil quality is not good or the oil does not operate normally, the lubrication performance will be affected, and there will be problems with heat dissipation, which is also the main reason for the cylinder.

Thirdly, the engine is overloaded. Engine overuse and overload can also lead to cylinders**.

Fourth, the intake and exhaust system or ignition timing failure. Inaccurate adjustments to the engine intake and exhaust system and ignition time can also result in engine cylinders**.

What to do with car cylinders**?

Car cylinders** can cause serious damage to the engine and often require a major overhaul to restore. What should I do if I encounter a car cylinder**?

1.First make sure the engine is in a flame-out cooling state, then remove the radiator cover;

2.Open the drain plug at the bottom of the radiator to allow the coolant to flow into the drum;

3.Close the drain plug and fill the radiator with water;

4.Turn on the engine, turn on the heater control system, add cooling system cleaner, and idle the engine for 30 minutes;

5.Turn off the engine and cool for 5 minutes, drain the liquid from the radiator air;

6.Close the drain plug, add water to the radiator and let the engine run dry for 5 minutes. Then, re-inject 50 to 50 water and glycol antifreeze into the coolant mixture.

Under normal circumstances, the cylinder** will cause serious damage to the engine, and the engine will be almost scrapped. Therefore, when the owner encounters a bend to the cylinder, he should also call the 4S shop to find a professional for repair or replacement of the engine for emergency treatment.

Millions of car purchase subsidies.