What does an electronic fan do for a car? What is the reason why the radiator electronic fan keeps turning?
1, improve the air flow rate through the radiator core, enhance the effect of heat dissipation, accelerate the cooling of water. 2. Help the engine to dissipate heat and ensure that the engine is in the best working condition. The role of the automobile electronic fan is to heat the engine, to help the engine cooling temperature, the electronic fan is controlled by the engine coolant temperature switch, usually there are two levels of speed 90°C, a low speed 95°C, two high speed. In addition, the opening of the air conditioner also controls the operation of the electronic fan (condenser temperature and refrigerant pressure control). Automotive electronic fan is controlled by the engine coolant temperature switch, usually has two stages of speed 90°C, low speed 95°C, two high-speed. In addition, the opening of the air conditioner also controls the operation of the electronic fan (condenser temperature and refrigerant pressure control). One is the silicone oil clutch cooling fan, which relies on the thermal expansion characteristics of silicone oil to drive the fan to rotate; The utility model relates to an electromagnetic clutch cooling fan, which is driven by the principle of magnetic field absorption. The main benefit is to drive the fan only when the engine needs to cool down, minimizing the energy loss of the engine.
Fan layout in the engine compartment The car fan is installed behind the water tank (near the engine compartment side), and pulls the wind from the front of the water tank when opened; However, there are also individual models of fans installed in the front (outside) of the water tank, and the wind is blown in the direction of the water tank when it is opened. The start of the fan is automatically opened or stopped according to the water temperature, when the speed is fast, due to the air pressure difference between the front and back of the vehicle, it is enough to play the role of the fan and maintain the water temperature at a certain degree, so the fan can not work at this time.
The electric fan works only to reduce the temperature of the tank. The temperature of the water tank is affected by two aspects, one is the cooling of the engine cylinder block and gearbox, and the other is the heat dissipation of the air conditioning condenser.
The air conditioner condenser and the water tank are two parts, close together, the front is the condenser and the back is the water tank. The large fan is called the main fan, and the small fan is called the auxiliary fan. The signal is transmitted by the thermal switch to the electronic fan control unit J293, which controls the electronic fan to start at different speeds. The realization of high speed and low speed is very simple, high speed does not series resistance, and low speed series two resistors (adjusting the size of the air output of the air conditioner is also this principle).
What is the reason why the radiator electronic fan keeps turning? Such a situation may be affected by the damage of the engine's water temperature sensor, and a new water temperature sensor needs to be replaced after such a situation. The radiator tank of the car engine is basically behind the electronic fan, which can speed up the speed of the air through the water tank, which can improve the heat dissipation efficiency.
If the electronic fan is started when it should not be started, it will affect the normal operation of the engine.
As a matter of course, this problem must be repaired immediately.
The engine used by the car is basically water-cooled, and such an engine relies on the continuous circulation of antifreeze to dissipate heat.
The antifreeze has two circulation paths in the engine, one is a large cycle, and the other is a small cycle.
When the engine is just started, the antifreeze is implemented in small circulation, this time the antifreeze will not be cooled by the cooling water tank, which is conducive to the engine quickly heating up.
After the engine reaches the normal working temperature, the antifreeze will implement a large cycle, and the antifreeze will dissipate heat through the cooling water tank, so that the engine can be maintained within a reasonable working temperature range.
The use of antifreeze for a long time will cause the freezing point to rise and the boiling point to fall, which will affect the operation of the engine, and of course the antifreeze needs to be replaced regularly.
It is recommended that small partners regularly replace the antifreeze when using the car at ordinary times, and the old antifreeze in the cooling system should be cleaned when replacing the antifreeze.
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