Parking Assist Distance Sensor: Description and Operation

Sensors




The PDC system of the E65/E66 uses 8 sensors in total, 4 in the front bumper and 4 in the rear.

The control unit sends a digital signal to set the ultrasonic sensor either in a combined transmit and receive mode or in a receive only mode.

Combined mode

The sensor first transmits a packet of ultrasonic impulses and then receives the echoes reflected by the obstacle within its sensing range.

On the basis of the time span between transmission and reception, the control unit calculates the distance to the obstacle.

Receive Only Mode

The sensor receives the impulses deflected by the neighboring sensors. The evaluation of these signals in the control unit improves the certainty of detection of the system.









The design of the sensor varies from that used until now in that the outer membranes are completely round instead of oval.

The advantages of this new round membrane shape are the greater detection range and lower sensitivity in wet conditions. The sensors are always painted in body color.