济南沃尔沃维修价格 历城区沃尔沃维修保养

1、 What is external circulation and what is internal circulation?
1、外循环：补充新鲜空气
1. External circulation: Supplement fresh air
外循环状态是利用风机将车外的空气抽吸到车内，也就是说车外与车内的气道是流通的，风扇打出的风来自车外，即使不开风机，车辆行驶中仍然有气流吸入到车内，补充车内的新鲜空气。有时觉得关了风扇还是有风，就是因为车主设置了外循环。在城里行车遇到拥堵的情形时，车内会充满尾气味，这就是由于使用外循环造成的。
The external circulation state is to use the fan to suck the air outside the vehicle into the vehicle, that is to say, the air passages outside the vehicle and inside the vehicle are in circulation, and the wind from the fan comes from outside the vehicle. Even if the fan is not turned on, the air flow is still sucked into the vehicle during driving to supplement the fresh air in the vehicle. Sometimes I think there is still wind when the fan is turned off, because the owner has set up external circulation. In the case of traffic congestion in the city, the car will be full of tail smell, which is caused by the use of external circulation.
2、内循环：阻隔污浊空气
2. Internal circulation: blocking dirty air
内循环状态是关闭了车内外的气流通道，不开风机就没有气流循环，开风机时吸入的气流也仅来自车内，形成车辆内部的气流循环。内循环主要是及时有效地阻止外部的灰尘和有害气体进入车内，比如行使中通过烟雾、扬尘、异味区域或车辆密集紧凑行驶时，阻挡前车排出的有害尾气。另外一个作用就是保温。

The internal circulation state is that the air flow channels inside and outside the vehicle are closed, and there is no air circulation without turning on the fan. When turning on the fan, the air inhaled only comes from the vehicle, forming the air circulation inside the vehicle. Internal circulation is mainly to timely and effectively prevent external dust and harmful gases from entering the vehicle, such as the harmful exhaust emitted by the front vehicle when driving through the smoke, dust and odor area or when the vehicle is dense and compact. Another function is to keep warm.

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