What exactly are the functions of internal circulation and external circulation of automobiles? How to use it correctly, the right way is here.

Many car owners, after driving for half a year, still don't know how to use internal circulation and external circulation. It's actually very simple, okay? Go on road trip, when the weather is cold, warm air will be turned on to keep warm. When the weather is hot, we will turn on the air conditioner to cool down. I believe many drivers know how to use these operations. One of the main functions of adjusting the air flow and temperature in the car is internal circulation and external circulation. Many novice friends are often confused by the complex function buttons on the air-conditioning panel, and they are even more unclear when to use the inner loop. When to use the outer ring? Today, I will give you a detailed explanation.

The working principle of external circulation is to use the fan to suck the outside air into the car and blow the inside air out of the car through the fan. External circulation is mainly used when the air in the car is turbid and needs ventilation. In addition, the function of defogging the windshield in rainy days is realized through external circulation.

The reason for internal circulation is very simple, that is, to prevent the outside air from entering the car, to prevent the inside air from being replaced by the outside air, and to prevent the inside air from being replaced. When heating in winter and cooling in summer need to promote the air circulation in the car, when the air outside is not good, the internal circulation can be turned on.

Simply put:

Internal circulation: blocking dirty gas

External circulation: supplement fresh air

Internal and external circulation sign

The logo is also very simple and easy to understand. The arrow from the outside to the inside indicates the external circulation, and air enters the car from the outside. The circulation in the arrow indicates that the air circulates in the car. Maybe the signs of different models are slightly different, but they are basically the same!

Internal circulation can keep warm, warm in winter and cool in summer. So generally speaking, whether it is warm air or cold air, we start the internal circulation first. However, with the continuous internal circulation, although the temperature inside the car drops, the sulfur dioxide exhaled by people inside the car will increase. Therefore, it is best to switch to external circulation and change the air every 1 hour.

Open high speed, open internal circulation or external circulation?

Step 1: circulate outside to make the temperature inside the car reach a comfortable temperature. This process basically takes half an hour.

Step 2: Circulate ventilation outside to keep fresh air into the car, so that the air inside the car has enough oxygen content.

Open internal circulation or external circulation when parking?

External circulation can not only suck the fresh air outside the car into the car, but also prevent the window glass from fogging. This function is especially useful when parking.

Turn on the air conditioner to reduce the temperature inside the car. Don't cycle outside at this time. You can turn on the external circulation every once in a while and get some fresh air. In summer, people always complain that the cooling effect is not good. In fact, it was accidentally set to the external circulation state, and the hot air outside the car continued to flow into the car, and of course the temperature would not drop. So if you want a good cooling effect, you must set it to the internal circulation state; If the temperature is not too hot, it can be adjusted with a little air conditioner to make people more comfortable under the dual effects of air conditioner and breeze.

In addition, if you are driving in the city, you should try to use internal circulation in traffic jams during rush hours, especially in tunnels. When the car starts to run at a normal constant speed, it should be turned on to the external circulation state. In addition, when encountering dusty road sections, don't forget to close the external circulation to block the external airflow while closing the window. Usually, it is best to set the parking in the internal circulation state, because in the external circulation state, the dust blown by the wind can easily enter the car, which increases the dust in the car.

Usually, when we get on the bus, whether it is winter or summer, we usually prefer the internal circulation mode, so that both cooling and heating effects will be more obvious.

But there will be a problem that fresh air outside can't get into the car. After a long time, the carbon dioxide exhaled by the people in the car will increase, and the people in the car will feel the air stuffy. At this time, it is necessary to switch to the external circulation mode to supplement the fresh air in the car. In general, it is recommended to replace it every hour or so.

In the state of internal circulation, the airflow channels inside and outside the car are closed, and there is no airflow circulation without turning on the fan. When turning on the fan, the inhaled airflow only comes from the car, forming airflow circulation inside the car. The main purpose of internal circulation is to prevent external dust and harmful gases from entering the car in time and effectively, for example, when driving through smoke, dust, odor areas or dense and compact vehicles, to prevent harmful tail gas discharged by the preceding car. Another function is to keep warm.

The ventilation mode of external circulation is more scientific, that is, there is an air inlet under the front wiper and an air outlet at the rear, that is, when we are driving at high speed, the wind comes in from the front of the car and then is discharged from the rear. This inlet and outlet are all along the pressure of wind resistance, so it has little effect on fuel consumption and can even reduce wind resistance.

When driving on ordinary roads, the timing of starting the external circulation is mainly determined according to the air condition outside the car. If you encounter traffic jams, serious air pollution outside and dusty roads, then you should choose internal circulation to prevent the inflow of polluted air outside. However, on the road with good road conditions, such as high-speed driving, if you feel stuffy inside the car, don't open the window to open the external circulation.

Many friends will say that it is more convenient to open the window directly. In fact, it is not safe to open the window when driving, because the wind noise is very loud and the fuel consumption is increased. If you accidentally break a stone, it is easy to hurt people. In addition, the degree of opening the window is not easy to grasp. You know, opening the window takes away the air and temperature inside the car. It is recommended to circulate outside.

Using the external circulation, you can breathe the fresh air outside the car and drive at high speed. After a long time, you feel that the air in the car is turbid, people are uncomfortable, and you can't open the window. You should use external circulation to bring in the breeze. It is too hot to send warm air in winter, so you can turn off the fan, turn on the external circulation, keep the temperature inside the car, and feel more comfortable with fresh air.

The external circulation state is that the air outside the car is sucked into the car by the fan, that is to say, the air duct outside the car and the air duct inside the car are circulating, and the wind generated by the fan comes from outside the car. Even if the fan is not turned on, there is still airflow sucked into the car to supplement the fresh air inside. Sometimes it feels windy when the fan is turned off, because the owner has set up an external circulation. When driving in the city and encountering traffic jams, the car will be full of tail gas smell, which is caused by the use of external circulation.

After buying a new car, like a newly renovated house, try to keep the exchange of air inside and outside the car as much as possible, so that the harmful gases inside the car can be volatilized and released as soon as possible.

When turning on the air conditioner heater, use the air communication mode inside and outside the car, and try to avoid using the self-circulation mode inside the car for a long time.

We should have the consciousness of choosing roads with relatively good air quality, just like choosing low-pollution green food, and try to drive on open and ventilated routes.

To fully understand when to use the inner loop and when to use the outer loop, we need to simulate several scenes in life.

Scene 1: It was 38 degrees and 7 degrees in Beijing. When I came out of the mall, I found that the steering wheel was very hot, so I opened the window and external circulation to exhaust all the stuffy air in the car, and then turned on the air conditioner and internal circulation, and the temperature inside the car dropped rapidly.

At this time, you must not make a mistake. In summer, the car is exposed to the sun, and the car is very stuffy. Open the window and circulate outside, which can effectively discharge the sultry air out of the car. It is better to turn on the air conditioner and internal circulation at this time.

Scene 2: It's another sunny weekend. My family of four drove out to go on road trip, and the air in the suburbs of the city was fresh. At this time, we opened the external circulation and breathed fresh air.

At this time, the external circulation is turned on because the air outside is fresh and we can breathe better air, so why should we prevent him from entering the car? At the same time, if the internal circulation is turned on for too long, the concentration of carbon dioxide in the car will rise, so people will feel sleepy and affect driving safety.

Wrong usage:

1 Turn on the external circulation of air conditioner in case of traffic congestion. As we all know, the air quality in cities is generally poor. Opening the external circulation in congested sections will let a lot of exhaust gas into the cab, and we will smell the exhaust gas of cars, which is harmful to our health!

Especially in winter, we turn on the air conditioner as soon as we get on the bus. As soon as we get on the bus, the engine temperature is low in winter and the air conditioner is turned on instantly. Because the water temperature did not come up, the engine speed increased, and the optimal mixing ratio could not be reached, and the engine was prone to carbon deposition. At the same time, under such loose temperature conditions, the water temperature rises slowly and the temperature inside the car cannot be raised!

Correct use:

1 Turn on the internal circulation of the air conditioner in case of urban congestion to prevent the tail gas from entering!

In summer, the fastest way to cool down is to open the door and open and close the door several times, which can effectively and quickly reduce the temperature by several degrees. According to the relevant investigation, this method can reduce the temperature by at least 5 degrees, and then use internal circulation after three minutes, because the temperature inside the car is generally higher than that outside in summer, and opening the window when driving can speed up the air circulation. When using the air conditioner, it can not only save fuel, but also reduce the temperature quickly.

In the process of high-speed driving in winter, we all realize that opening the window will also have a certain impact on the speed and fuel consumption, so the best way is to turn on the external circulation of the air conditioner within a certain period of time. If you use the internal circulation of air conditioner for a long time, the fresh air in the room will cause dizziness and other phenomena, which is very dangerous to remind everyone to use the internal circulation with caution!

We sometimes feel sleepy when driving at high speed, not only because we drive for a long time, but also because the air flow in our car is not well regulated, which leads to too much carbon dioxide, too high temperature and sultry heat in the car, which makes us feel sleepy and dangerous.

One of the main functions of adjusting the air flow and temperature in the car is internal circulation and external circulation. Many novice friends are often confused by the complex function buttons on the air-conditioning panel, and they are even more unclear when to use the inner loop. When to use the outer ring? Today, I will give you a detailed explanation.

Internal circulation and external circulation are two independent buttons on the air conditioning control panel, which is also easy to understand. Internal circulation is to circulate the air in the car when it is closed. This icon is a circular arrow in a closed car. External circulation is to let the air outside the car flow into the car. The icon is a convertible with an air arrow pointing inward.