Car air conditioning, which is often used by the owner during the driving process, relieves the owner of driving fatigue and gives the insider a comfortable environment. But do you know how car air conditioning works? Let's take a look。
What do auto air conditioning do
In people's subconscious, the role of car air conditioning is cold in the summer and hot in the winter, which in essence can be attributed to four roles:
(1) refrigeration, i. E. Cold wind in the summer, air-conditioning refrigeration systems absorb the heat in the vehicle and reduce the temperature in the vehicle, and our maintenance of air-conditioning is mainly focused on the refrigeration system;
(2) heating, i. E. A warm winter, with a separate heat-making device in the passenger vehicle, while the car is mostly used to work with an engine, with cooling fluids to distribute heat inside the vehicle and raise the temperature inside the vehicle;
(3) the introduction of air conditioning and purification in the vehicle;
(4) control of the humidity of the air in the vehicle: good control of the humidity of the air in the vehicle through the mixing of cold and hot air;
In the age of manual air conditioning, it is difficult to understand the third and fourth functions。
Automobile air conditioning structure and working principles
The above picture of the ac structure and working principles of the car appears to be more complex, and i've deciphered it into four aspects: how to cool, how to make the heat, how to manipulate the air conditioning panel and how to control the windway
In order to achieve brake refrigeration, a sealing system consisting of compressors, condensers, liquid dry filters, expansion valves and evaporaters is required to fill the system with refrigerant r134a, which is driven by engines to drive the flow of refrigerant r134a. The condenser is outside the car, the refrigerant r134a is in the condenser by gas dispersing heat in liquid form, while the evaporation agent r134a is in the car by liquidation from gas to gas in the evaporation unit, absorbing heat and reducing temperature in the car。
Two fans are required for normal operation of the condensers and evaporaters: the fans in the condensers are used for heat cooling, the fans of the evaporation blades are often referred to as wind drums, air currents blowing through the evaporationers prevent evaporation on the surface and bring cold wind inside the vehicles。
Automobile air-conditioning cycle logic
(b) the passenger car has a separate heating device, while the car works mostly with an engine, using cooling fluids to distribute heat inside the car and raise the temperature inside the vehicle;
Parsat warm waterbox map
Let's see what the car air conditioning panel controls
Air-conditioning switch key operation performance diagram, now typical manual air-conditioning panel functionality design
The a/c switch is the so-called ac switch, which in essence controls the operation of the compressor. The compressor is charged with an electromagnetic-controlled clutch, and when its wires are running, the compressor collides, the compressor works, otherwise the compressor's belt wheel is empty and the compressor is not working. When you press the air conditioner switch, you hear a crack, and the compressor's electromagnetic compressor adsorption。
In the middle of the a/c switch to the compressor electromagnetic ionosphere, there are many protection switches, such as when you press the a/c switch in the winter, the compressor will not work because there is a switch to prevent cryogenic activation of the compressor; there is also a pressure switch to prevent excessive pipe pressure and automatically cut the compressor electromagnetic ionator; when you press the a/c switch, you hear the compressor adsorption and then release the suspension, and it's also because the temperature switch of the air conditioner prevents it from working。
Automobile ac compressor electromagnetic ionator coil figure
There are three switches: internal and external circulation switches, temperature adjustment switches and wind-out mode switches, which control three rollers. As shown in the figure below:
The algorithm behind the air conditioning panel
(b) internal and external circulation patterns of air: control of internal or external air sources of exhaust in vehicles; generally internal circulation patterns are used when cooling, i. E. Air is extracted from the vehicle;
Temperature regulation of air: air cooling via evaporation units in the refrigeration system, heating up through warm wind water tanks, control of the proportion of air flow through warm wind water tanks, and regulation of air temperature and humidity in vehicles;
(a) the regulation of the winding pattern: the regulation of which part of the winding: the winding to the top, or to the panel, or to the lower foot, or both;
Ac switch key operation graph
The control of these three flipboards is now electrically controlled, the switch is electrically controlled, while the early or lower-end vehicle type is controlled by pull wires, which later becomes more rigid。
Original link: www. Che. Com/list/2357. Htm
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