How to Determine the Distance of a Parking Sensor?
2 Answers
You can judge the distance by the sound emitted by the parking sensor. Here are the relevant details: 1. The alarm from the parking sensor is a beeping sound at a certain frequency, and the frequency increases as the obstacle gets closer. 2. Since the settings of parking sensors vary across different car models, there is no one-size-fits-all answer. It can only be figured out through experience over time. 3. However, one thing is the same for all car models: when the beeping sound becomes increasingly rapid and eventually turns into a continuous tone, it indicates that the reversing distance has almost reached its limit. Parking Sensor Principle: 1. A parking sensor generally consists of three parts: an ultrasonic sensor, a controller, and a buzzer. 2. During operation, the ultrasonic sensor emits ultrasonic waves. When these waves hit an obstacle, they reflect back and are received by the ultrasonic sensor again. The controller then calculates the actual distance of the obstacle based on the time it takes for the ultrasonic waves to be emitted and received. Finally, the buzzer emits a rapid alarm sound to alert the driver to the obstacle's distance.
I've driven many car models, and the judgment of the parking radar mainly relies on changes in sound frequency. Generally, after the radar is turned on, it emits intermittent beeps. If the sound is very slow, such as one or two beeps per second, it means there is still some distance behind, usually about one to two meters, which is quite safe. When the sound speeds up and becomes rapid, it indicates that the obstacle is within half a meter, and you need to carefully control the throttle. When the beeping becomes continuous or screams like an alarm, it means the distance is extremely close, possibly within 0.3 meters, and you must stop immediately to avoid a collision. Additionally, the position of the sensors is crucial. If they are blocked by mud or the signal is weak on rainy days, the distance may not be accurate. I usually clean them before reversing. It's advisable to combine the parking radar with the rearview camera or mirrors for confirmation, not relying solely on the radar, especially when there are low objects by the roadside—drive slowly.
