Yan Yan Summer，Driving is very convenient and cool，But when driving in the urban area，The taste of the car is often filled with the taste of the car，Even in an empty place or on high -speed roads，Sometimes I feel dizzy and chest tightly。Why is this? The reason，It is the riders during the driving process，It is not caused by internal and external circulation。

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What is an internal cycle?

outer cycle: supplement fresh air

outer circulation status is to use the fan to pump the air from the car to the inside of the car，seabet appThat is to say, the airway outside the car and the inside of the car is circulating，The wind from the fan comes from outside the car，Even if the fan is not opened，Vehicle still has airflow inhaling in the car，Fresh air in the car。

Sometimes I feel that it is still windy when the fan is turned off，It is because the owner has set an external circulation。When driving in the city, when you encounter a congestion in the city，The inside of the car will be full of tail odor，This is caused by the use of external circulation。

Inner cycle: blocking the dirty air

Inner circulation status is to close the air flow channel inside and outside the car，Without the ventilator, there will be no air circulation，The airflow inhaled during the ventilator is only from the car，Form an air flow cycle inside the vehicle。

Inner loop mainly prevent external dust and harmful gases in the car in a timely and effective manner，For example, through smoke during driving、Dust、When the odor area or the vehicle is dense and compact,，Stop the harmful tail gas from the front car。Another role is insulation。

Under what circumstances is used?

Under what circumstances uses internal circulation?

In the case where the external air quality allows，Recommended external circulation，Because there is no reason to refuse fresh air。

1)、High -speed driving，After a long time, I feel that the air in the car is turbid，People are uncomfortable，Can't open the window，seabet myYou should use the external circulation to hit the breeze;

2)、It feels too hot when sending warm wind，Turn off the fan，Open the outer cycle，Keep both the temperature in the car，There are fresh air，I feel more comfortable。

The following situations are recommended to use internal circulation.

1)、Internal circulation when traffic jams，It can prevent tail gas from entering the car;

2)、If the air conditioner is turned on to quickly reduce/increase the temperature in the car，It is recommended to open an internal cycle at this time，Open the time to open the outer cycle，Replace some fresh air;

3)、Usually parking is also set to inner circulation status，Due to the external circulation state，The dust from the wind is easy to enter the car，increase the dust in the car;

4)、When turning on the air conditioner in summer or warm air in winter，In order to keep the temperature in the car, use internal circulation，But from time to time, you should drive the outside loop to change the air in the car。

Of course，Different car owners use environment、The usage will be different，Learn the core meaning of the internal and external circulation，You can use it flexibly!