Working principle of automobile electronic fan
The operation of the automobile electronic fan is controlled by the engine coolant temperature switch. It usually has two-stage speed, 90 ℃ low speed and 95 ℃ high speed. In addition, when the air conditioner is turned on, it will also control the operation of the electronic fan (condenser temperature and refrigerant force control). Among them, the silicone oil clutch cooling fan can drive the fan to rotate due to the thermal expansion characteristics of silicone oil; The utility model relates to a heat dissipation fan of an electromagnetic clutch, which uses an electromagnetic field to reasonably drive the fan. The advantage of Zhufeng is that it drives the fan only when the engine needs to cool down, so as to reduce the energy loss of the engine as much as possible
The automobile fan is installed behind the water tank (can be close to the engine compartment). When it is opened, it pulls the wind in from the front of the water tank; however, there are also individual models of fans installed in front of the water tank (outside), which blow the wind in the direction of the water tank when it is opened. The fan starts or stops automatically according to the water temperature. When the vehicle speed is fast, the air pressure difference between the front and rear of the vehicle is enough to act as a fan to maintain the water temperature at a certain level. Therefore, the fan can not work at this time.
The fan only works to reduce the temperature of the water tank
The temperature of the water tank is affected by two aspects. One is the cooling air conditioner of the engine block and gearbox. The condenser and the water tank are close together. The condenser is in front and the water tank is behind. The air conditioner is a relatively independent system in the car. However, the start of the air conditioning switch will give a signal to the control unit. The large fan is called the auxiliary fan. The thermal switch transmits the signal to the electronic fan control unit 293293 to control the electronic fan to start at different speeds. The realization of high-speed and low-speed is very simple. There is no connecting resistance at high speed, and two resistors are connected in series at low speed (the same principle is used to adjust the air volume of the air conditioning).
