How an automotive electronic fan works
Automotive electronic fan is controlled by the engine coolant temperature switch, usually has two stages of speed 90°C, one low speed 95°C, two high speed. In addition, the opening of the air conditioner will also control the operation of the electronic fan (condenser temperature and refrigerant pressure control). One is the silicone oil clutch cooling fan, which depends 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 magnetic field suction principle. The main benefit is to turn on the fan only when the engine needs to be cooled, minimizing engine energy loss
The car fan is installed behind the water tank (near the engine compartment side), when it is opened, it pulls the air in from the front of the water tank, but there are also some models of the fan is installed in the front of the water tank (outside), when it is opened, it blows the air in the direction of the water tank. The fan starts or stops automatically according to the water temperature. When the speed is fast, the air pressure difference between the front and back of the vehicle is enough to play the role of the fan and maintain the water temperature to a certain extent. Therefore, the fan can not work at this time.
2. The temperature of the water tank is affected by two aspects, one is the cooling of the engine cylinder and transmission, and the other is the heat dissipation of the air conditioning condenser. 3, air conditioning condenser and water tank are two parts, close together, the front is the condenser behind the water tank. 4, air conditioning is a relatively independent system in the car. But the start of the air conditioning switch will give a signal to the electronic fan control unit J293, forcing the electronic fan to rotate. 5. The big fan is called the main fan, and the small fan is called the auxiliary fan. 6.
7, the realization of high speed and low speed is very simple, high speed does not series resistance, low speed series two resistors (adjust the size of the air volume of the air conditioning is also the original
