China Naming Network - Eight-character Q&A - What are the hazards of traffic jams?

What are the hazards of traffic jams?

Due to the increase of private cars, the traffic pressure in the morning and evening rush hours and holidays is very great, and traffic jams are commonplace. What are the hazards of traffic jams?

What are the hazards of traffic jams?

1. Increase fuel consumption

When the engine speed is very low, the intake vortex becomes weak, resulting in poor fuel atomization and incomplete fuel combustion. In addition, when the engine speed is very low, the air leakage of the valve and piston ring will increase. In addition, the contact time between the combustion gas in the cylinder and the cylinder wall increases, which increases the heat loss, thus increasing the fuel consumption of the engine. For gasoline engines, because the intake airflow is weak at idle speed, it is difficult for carburetor to blow away the oil mist, so the mixture is required to be rich, which will also increase fuel consumption.

2. Increase carbon deposition

Driving at low speed for a long time will produce carbon deposits in traffic jams. The reason is that the engine speed is low, or the air intake is small, and low flow will produce carbon deposition in the throttle and idle motor.

3. Increase cylinder knock

When the engine is idling, the temperature and pressure in the cylinder are relatively low, which prolongs the preparation time of fuel ignition. At this time, the tightness of the cylinder is reduced, and it is easy to knock on the cylinder, shortening the service life of the engine.

4. Increase gearbox damage

When parking in traffic jam, the speed changes constantly, and the gearbox changes gears frequently, so the degree of wear is naturally higher. The hydraulic torque converter of AT gearbox works for a long time, which leads to high oil temperature and damages the gearbox. When the dual-clutch gearbox is in traffic jam, the clutch will always be in a semi-clutch state, which will automatically protect itself from overheating for a long time, and even cause power output interruption.

5. Increase the wear and tear of parts.

As we know, the congested road conditions make the vehicle in a stop-and-go state, and the air circulation in the empty engine is not smooth, which makes the fuel burn insufficiently. However, under the action of high temperature and oxygen, the fuel with incomplete combustion is easy to form colloid, which will adhere to the surface of parts to form sludge, which will lead to abnormal phenomena such as poor engine operation, difficult start, unstable idle speed and poor acceleration. At the same time, the lubricating oil itself cannot flow and lubricate fully. In addition, when the temperature of the coolant drops below 60℃, the combustion products in the cylinder may react with water to generate acid, thus aggravating the corrosion degree of the cylinder.

6. Increase the risk of frost resistance.

In cold winter, if the engine is idling for a long time, it is easy to cause the radiator or sewer pipe to freeze, prevent the coolant from entering the radiator, and even cause abnormal "boiling" phenomenon.

7. Increase sewage discharge.

When idling, due to incomplete combustion in the cylinder, the exhaust gas contains a lot of harmful and toxic components such as hydrocarbons, carbon monoxide and nitrogen oxides. These harmful and toxic components enter the atmosphere and pollute the ecological environment. If drivers inhale these exhaust gases for a long time, they may suffer from various diseases.

The result of long-term traffic jams.

Long-term traffic jams have very serious consequences for engine wear. If the cylinder wall or piston ring of the engine is worn, it will first affect the cylinder pressure drop of the engine and make the fuel-air mixture in the combustion chamber burn insufficiently. Secondly, because the gap between the cylinder wall and the piston increases, the piston ring can't scrape off the excess lubricating oil and stays in the combustion chamber to burn in vain. Thirdly, the high-temperature gas in the combustion chamber will rush into the cylinder through this gap, and the high temperature and high pressure will accelerate the oxidation and acidification of engine oil, which will lead to the deterioration of engine oil performance and corrosion of the cylinder surface. In the long run, it will accelerate the aging of the engine and reduce the overall performance of the car.

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