DESCRIPTION
The parking assistance system provides the driver with information, whilst reversing, on the distance from any objects behind the vehicle which could be out of their field of vision.
The information of the presence/distance of an obstacle is transmitted to the driver by means of acoustic warnings whose frequency depends on the distance of the vehicle from the obstacle.
A dedicated screen is displayed on the instrument panel when the rear sensors are activated during a parking manoeuvre. The concerned sectors light up in proximity of obstacles. There are 8 sectors in total.
An electronic control unit activates and controls the operation of the sensors located in the rear bumper, processes the signals received and operates the buzzer in the instrument panel.
The system is activated with reverse gear engaged: in these conditions, the control unit energises the transducers and sends them a signal request, receiving the response signals.
The reversing light activation signal is acquired by the engine control unit and sent via the CAN to the Body Computer which forwards it via the CAN to the parking sensor control unit.
The sensors use ultrasound technology and act as intelligent transmitters/receivers with triangulation technology. They allow improved detection in critical situations or in the presence of small obstacles. The impulses emitted are reflected by any obstacles; the transducer receives an echo which is converted into a digital signal and sent to the electronic control unit.
The signalling of the distance of the obstacle is achieved through intermittent impulse sound signals: the frequency of this signal increases gradually as the bumper approaches an obstacle: when the distance calculated drops below 30 cm, the sound becomes high pitched and constant; the acoustic signal stops when the distance of the obstacle increases.
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The distance measurement only takes place when the system is activated, whilst only the control unit is operational in the inactive state. |
The control unit is equipped with a self-diagnosis function: when switched on the control unit carries out an initial test on the sensors which are then continuously subject to fault diagnosis during the operation of the system. A fault in only one sensor inhibits the operation of the entire system: in this case the system excludes itself and sends a fault message, the failure status is signalled to the instrument panel which switches on the special warning light and sends a suitable acoustic signal.
For more details:
See descriptions 5580H PARKING OBSTACLE DETECTION DEVICE
The system is supplied by an ignition-operated circuit protected by a specific fuse in the junction unit under the dashboard.