Wear and carbon deposition do exist.

The short-distance car injuries mentioned on the Internet are mainly abrasions and carbon deposits. These two situations do exist. Qiao Chuanwei of North China University of Water Resources and Hydropower has a master's thesis "Study on Low Temperature Performance of Automobile Engine Lubricating Oil", which reads. 80% wear of automobile engine occurs at the moment of cold start, and the wear of engine at low temperature is 6 times of normal working temperature.

If you start cold frequently, the engine will wear out a lot. Don't warm up before every exercise, and the wear of joints and knees is really more serious. You'll cramp if you don't do it well. This is also the case.

As for carbon deposition, Wang of South China University of Technology also has a master's thesis. You might as well listen to "Experimental Study on the Mechanism and Prevention of Carbon Deposition in Intake Valve of Port Injection Gasoline Engine", which says. The engine often works in short-term operation, which is easy to produce carbon deposit.

Because the engine temperature is low, in order to ensure stable start and rapid temperature rise, the fuel injection will increase, but also because of the low temperature, the fuel injection will increase, the combustion will not be so full, and more carbon will be produced. So these two injuries do have a great impact on the engine.

It is written in many vehicle maintenance manuals, and so is the article about "bad driving conditions". Mazda 3 owner's manual, often engaged in short-distance driving, has reminders and warnings, which will have an impact on the car condition.

Does it hurt? How long does it take to turn on the battery?

Another point that everyone mentioned more was short-distance driving, and the battery was dead, which was not bad. The power consumed by the car every time it starts can be fully charged in about 2 minutes. Even if the commute distance is less than 5 kilometers, it still takes 2 minutes to get there.

It is not so exaggerated to say that cars will break down easily.

Considering the frequency, in fact, the damage is not much different. How can I put it? Although short-distance driving is harmful to the engine, it is not so big that we need to be scared. If you look closely, there are frequent and frequent words in the previous description.

Speaking human words is: quantity is harmful. This is like: arsenic, which is highly toxic when used in large quantities, can be used as medicine and can cure diseases when used in small quantities. In fact, whether you drive 5 kilometers or 50 kilometers to and from work every day, don't you start twice? Right? Everyone has gone through two cold start stages.

Only 5km people only drive at this stage; The 50km man completed the 5km situation and drove another 45km, right? So the damage to the engine at this stage of "hot car" is the same.

As long as you don't drive a particularly short distance, such as within 1km, start to drive out with a "wow" and stop immediately. Generally speaking, the problem will not be particularly big.

There are special instructions about temperature in the maintenance manual.

Another factor that has a great influence on short-distance driving is low temperature. The harsh conditions of this maintenance manual are also mentioned in particular, and many of them are written in an article with short-distance driving. For example, Honda Fit's maintenance manual can be found online.

In bad conditions, it says: drive below 8km at a time, or drive below freezing point 16km. What's this called? This is called "poor conditions", not windy and rainy. Therefore, in winter, especially friends in the north, we must pay attention to the water temperature of the car during short trips. For example, this road takes less than 2 minutes, and the water temperature hasn't come up when the car is driving, so it will cost a lot to come back 365 days a day.

What have not actually been talked about?

In addition to the influence mentioned above, there is another problem that has actually been ignored by many friends. Isn't it famous for a while before? It means "increasing oil and emulsifying oil", right? This is actually related to short driving in winter.

Ouyang Dan, technical center of Dongfeng Motor Corporation, published in Proceedings of the Annual Meeting of China Automotive Engineering Society (20 18). There is a paper on "solving the fuel dilution problem of direct injection gasoline engine", which reads.

When starting at low temperature, because of more fuel injection, the wet wall situation is relatively more serious, that is, the inner wall of the cylinder is wet and the fuel can not be completely burned, and these fuels will flow into the crankcase through the cylinder wall.

Under short-distance working conditions, the water temperature and engine oil temperature are low, and the fuel dissolved in engine oil has no time to evaporate. Long-term accumulation will lead to the problem of increased engine oil. In addition, because blowby gas enters the crankcase from the combustion chamber, the water vapor content is relatively high.

At this time, whether it is in direct contact with engine oil or through oil-gas separator, it will encounter the problem of cold condensation mixed with engine oil, and the same long-term accumulation will lead to emulsification of engine oil.

Of course, this is a very extreme situation, and normality is really unlikely to happen. Unless your mileage is really short, and then the temperature is very low, which is more serious than those mentioned in the manual just now, then you need to pay attention.

Even so, it is not insoluble. We can extend the working time of the engine by heating the car locally. As long as the temperature rises, most of the gasoline and water vapor mixed in the engine oil will still volatilize.

You have time to run more and take your friends and children shopping on weekends, right? The engine is also running at full heat, instead of always cold, and the gasoline and water in the engine oil can be well separated.

The maintenance period can be shortened appropriately.

Besides what I said just now, there is another thing to pay attention to. It is more realistic to shorten the maintenance cycle properly when driving such a short distance in a low temperature environment. This is actually written in the maintenance manual. I guess you didn't notice. For example: Mazda 3, the normal maintenance cycle is 5000km or the oil is changed once every six months, and the working condition is shortened to 2500km or changed once every three months.

Take good care of it. It's no problem to drive short distances.

Generally speaking, as long as you do a good job of maintenance and only commute normally, you won't start there often, and it's not terrible to drive short distances.