What is the purpose of the rotating knob in the middle of the wiper?
3 Answers
The function of this knob varies depending on the vehicle model. It is generally used to control the frequency of the wiper's operation. For specific functions, please refer to the car's user manual. Below is some related information about wipers: 1. Definition: Wipers, also known as windshield wipers, are generally categorized into vacuum wipers, electric wipers, and wipers with electronic control units. 2. Function: Wipers can remove dust and water droplets from the windshield. They usually have three settings: low speed, high speed, and intermittent, which help improve the driver's visibility and enhance driving safety.
I often use the central rotary knob of the wiper while driving to adjust the wiping speed according to the intensity of the rain, making it more suited to actual needs. During light rain, I set it to a slow intermittent mode to prevent the wiper from moving too fast, reducing wear and minimizing annoying noise. In heavy rain or storms, I increase the speed to ensure the windshield is quickly cleared, maintaining an unobstructed view. If accidentally set to an inappropriate speed, driving becomes uncomfortable—for example, heavy rain at low speed makes it hard to see the road. This knob is typically connected to the vehicle's electrical system, controlling the wiping frequency by adjusting resistance values. A simple wipe during routine maintenance can extend its lifespan. In short, flexible adjustment enhances driving comfort and safety, especially useful during long trips.
The rotating function in the center of the wiper controls the frequency of intermittent wiping. Based on my own car experience, it allows users to customize the speed according to different weather conditions. Set it to slow speed during light drizzles, where the wiper moves every few seconds; adjust it faster for moderate rain; and set it to rapid intermittent mode during heavy downpours. If the rain intensity changes quickly, easily switch settings by rotating the knob to avoid manually toggling the switch repeatedly. Many modern cars also integrate sensors, allowing the knob to adjust sensitivity accordingly. Regularly check if the knob rotates smoothly—if it gets stuck or malfunctions, it may cause erratic wiper movement or failure, requiring contact cleaning. Proper usage not only enhances driving comfort but also extends the lifespan of the wiper blades and motor.
