Parking Assist System

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How Does The Parking Assist System Work?

The Parking Assist System consists of a ultrasonic radar ECU, a buzzer and several (usually 4) ultrasonic parking sensor installed on the rear bumper. If a backup camera is fitted, an image of the area behind the vehicle is displayed on the navigation screen.

The ultrasonic radar system uses ultrasonic signals, controlled by the microcomputer in the ultrasonic radar host, and then compares the signal return time to calculate the obstacle distance during the process of transmitting and receiving signals from the probe, and then the alarm will emit different alarm sounds. Distance to obstacle = time difference between sending and receiving × speed of sound/2.

When the vehicle is in reverse gear, the ultrasonic radar ECU uses ultrasonic sensors to monitor the area around the rear bumper. If an object is detected in the monitored area, the audible alarm device in the instrument assembly will issue an audible warning. The system can detect relatively hard solid obstacles as well as objects such as barbed wire and fences.

Diagram of Parking Assist System

When the parking assist system works, the ceramic piece vibrates after the microprocessor issues a command, resonates with the aluminum alloy shell to form ultrasonic waves, and emits it to the surrounding. Sound waves around and behind are not needed, and sound-absorbing materials must be added to reduce these disturbances. After the ultrasonic wave is launched, it will form an echo when it encounters an obstacle, and the echo is received by the same aluminum alloy shell and ceramic plate in the form of vibration.