2021 Levin button functions include Vehicle Stability Control, Air Recirculation, Parking Radar, and Auto Hold. Here are the detailed introductions: Introduction to Vehicle Stability Control: Vehicle Stability Control is a new active safety system for vehicles, which is an extension of the functions of the Anti-lock Braking System (ABS) and Traction Control System (TCS). It adds a yaw rate sensor, lateral acceleration sensor, and steering wheel angle sensor when the vehicle is steering. The ECU controls the driving and braking forces of the front, rear, left, and right wheels to ensure the lateral stability of the vehicle. Introduction to Air Recirculation: The external circulation mode uses a fan to draw air from outside the vehicle into the cabin, meaning the air passage between the outside and inside is open. The air blown by the fan comes from outside the vehicle. Even if the fan is turned off, air will still flow into the cabin while driving, providing fresh air. Sometimes, you may feel air coming in even when the fan is off, which is because the external circulation mode is set. When driving in congested urban areas, the cabin may fill with exhaust fumes due to the use of external circulation. The internal circulation mode closes the air passage between the inside and outside of the vehicle. If the fan is off, there is no air circulation; if the fan is on, the air blown in comes only from inside the cabin, creating internal air circulation. The internal circulation mode mainly prevents external dust and harmful gases from entering the cabin, such as when driving through smoke, dust, or areas with strong odors, or when driving closely behind other vehicles, blocking harmful exhaust fumes. Another function is to maintain cabin temperature. Introduction to Parking Radar: Parking Radar is a safety assist device for reversing or parking, generally divided into front and rear radars. The function of front and rear parking radars is to detect obstacles in front of or behind the vehicle when parking or turning around, providing the driver with necessary information such as distance, direction, and area of the obstacles, while also sounding an alarm when approaching an obstacle. Introduction to Auto Hold: Auto Hold, also known as AUTO-HOLD, refers to an automatic braking function. After activating this function, for example, when stopping at a traffic light, it is equivalent to not needing to pull the handbrake, simplifying the operation by avoiding the use of the handbrake or electronic handbrake. For automatic transmission models, it also eliminates the need to frequently switch between D to N or D to P.
