Analyze from the automobile air-conditioning compressor why turn on the A/C switch, the vehicle will charge oil

Analyze from the automobile air-conditioning compressor why turn on the A/C switch, the vehicle will charge oil.

Why do some vehicles charge gas when they turn on the A/C switch? We can analyze it from the car compressor. Automobile air conditioning refrigeration relies on the "gas", "liquid" and "gaseous" form of the refrigerant. The current R134A refrigerant used in vehicles can boil and evaporate in an environment of minus 26 degrees Celsius, that is to say, the evaporation of this substance The temperature is extremely low, and it will be gaseous in a normal pressure and normal temperature environment. Therefore, the car air-conditioning system stores this substance in the pipeline. When the car needs cold air, only the A/C switch needs to be turned on. This button controls the air-conditioning compressor to be energized or de-energized; the electromagnetic clutch of the compressor is energized after it is turned on.And then combined with the pulley driven by the engine, the pulley will drive the compressor to start movement.

The engine and the compressor are combined through a belt. The engine crankshaft is the power output shaft. The rotation of the crankshaft drives the compressor pulley to rotate to provide torque (power) for the compressor. After the compressor generates power, it drives the gaseous refrigerant in the pipeline to flow. After cooling and dehydration, the refrigerant will become a liquid and sent to the evaporator after reaching the expansion valve. The evaporation will absorb heat, and the evaporation of the refrigerant will reduce the temperature of the evaporator. After the evaporator cools down, the blower blows high-temperature hot air through the low-temperature evaporator to cool down, and then it is sent into the car as cold air; because the water vapor in the hot air will condense into water when it is cold, the search evaporator will have It is normal for water to flow from the front of the vehicle when the air conditioner is used in the drainage hole.

In the operating principle of the above-mentioned formal automobile air conditioning system, the function of the compressor is to provide "pushing force" for the flow of refrigerant; and the compressor itself has no power system, and the engine drives the compressor to run naturally to lose the power of the engine. The power required for compressor operation is often about 2.5kw, which is equivalent to about 3.5PS (commonly known as horsepower) of metric horsepower; the horsepower output when the engine is idling is only about 10PS, and the power occupied by 3.5PS after the compressor is turned on will cause idling. The generated power cannot drive the crankshaft to operate normally-the engine will stall. In order to prevent the engine from stalling, the ECU must also output about 13.5PS of horsepower when the engine is idling. The only way to increase is to increase the speed to increase the air intake and fuel injection, which is to increase the fuel consumption compensation power. This is to use the cold air conditioner to turn on A /C The reason why the vehicle will charge for fuel.