The active air intake grille is part of the vehicle's thermal management system. It is located at the head of the vehicle and integrated with the grille on the front bumper. When the vehicle is cold started, the front air intake grille will be closed to allow the engine to quickly heat up, allowing the vehicle's engine to reach operating temperature as quickly as possible. When the vehicle temperature is too high, the front air intake grille will actively open to allow the engine to dissipate heat as quickly as possible. When the vehicle is driving at high speed, the air intake grille will automatically close to reduce the vehicle's wind resistance and improve fuel economy. Generally speaking, the active air intake grille has two functions, one is to perform thermal management (warming up and heat dissipation), and the other is to reduce wind resistance.

　　working principle

　　Active air intake grilles are generally composed of servo motors, ECUs, water temperature sensors and air intake grilles and other major components. When the vehicle is running at low temperature, due to the lower temperature in the cylinder, the atomization effect of the fuel injected from the fuel injector becomes worse, which results in high cold vehicle fuel consumption and low fuel economy. In order to avoid such a thing from happening, the ECU will receive and analyze the water temperature data, and then send the analysis results in the form of instructions to the servo motor that controls the closing of the active air intake grille. After the air intake grille is closed, the cold air outside the car cannot hit the radiator for cooling, and the engine can reach operating temperature in a short time, thereby improving the vehicle's fuel economy. The same is true in reverse. When the vehicle temperature is too high, the ECU will control the servo motor to open the air intake grille, allowing the cold air from the outside to hit the radiator for forced heat dissipation, thereby achieving the purpose of cooling the engine.

　　When a vehicle is traveling at high speed, air will hit the head of the vehicle and flow from the roof, sides and chassis in several directions. In order to effectively reduce wind resistance, car companies will basically use technologies such as streamlined bodies and hidden door handles, and will also add large-area flat guards to the chassis. However, the wind impact area on the front of the vehicle is still very large. In order to solve this problem, engineers designed an active air intake grille. When it is closed, the air can be diverted from the upper, lower and both sides of the air intake grille, which can be easily Reduce wind resistance to a large extent and improve vehicle fuel economy.

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