Operation principle of the parking aid
Just like bats, sensors send out ultrasound signals and pick up their echo. The system uses the time difference between these two signals to calculate the distance between the vehicle and obstacle, which it can do from up to 2.5 meters away. Depending on the type of car and system, it either sounds an alarm or combines an alarm with a visual warning signal to the driver. The alarm-only version indicates the distance with a progressive tone alert, which increases in frequency the closer the car gets to an obstacle, finally becoming continuous.
Optical-acoustic systems start by visually indicating the vehicle's proximity to an obstacle using LED displays or an on-screen image, and accompany this with an alarm when the car gets too close (approximately 30 centimeters or less).
Depending on vehicle manufacturer, model and requirements, the system consists of two up to 12 ultrasonic sensors, which monitor the close-up area in front of and/or behind the vehicle. The ultrasonic sensors, painted in the vehicle’s color, can be integrated inconspicuously into the bumper.