Land Rover Discovery: Proximity Cameras

Proximity Camera Coverage Zones

1. Front Proximity Camera
2. Right Proximity Camera
3. Rear Proximity Camera
4. Left Proximity Camera

The proximity camera system has four cameras that are located in the following:

• One camera located in the front bumper.
• One camera in each of the door mirror assemblies.
• One camera in the tailgate.

The proximity camera system uses Video Graphics Array (VGA) resolution cameras, that are permanently powered whenever the ignition is 'on'. Each camera provides an image covering a zone approximately 130º wide by 112º deep and is capable of capturing approximately thirty frames per second.

The cameras employ high-quality digital High Dynamic Range (HDR) imaging, which is set of techniques that allow a greater range of luminance between light and dark areas of an image scene. This allows HDR to more accurately represent the varying intensity levels found in the image scenes that can range from direct sunlight to deep shadows.

Camera Mounting

To reduce the cost of accident repair, the mounting of the front bumper cameras feature a 'snap free' bracket. On impact, the bracket will release the camera preventing damage to the camera itself. Depending on the severity of the accident it may also be possible to reuse the brackets as they are manufactured from a memory type plastic.

he positioning accuracy of all the cameras is crucial for the successful operation of the proximity camera system. The camera housings are manufactured using metal to maintain a structural stability in high-ambient temperatures. Without this stability a loss of image focus would be a possibility, therefore care must be taken when mounting the cameras in ensuring they sit correctly into their locations. Secure mounting of the cameras provides an initial 'build up' tolerance accurate to 2 mm. In the event of camera replacement, a calibration routine must be performed.

PARKING AID SYSTEM - OPERATION

The parking aid system is activated when:

• Reverse (R) gear is selected directly form Park (P).
• Drive (D) gear is subsequently selected, and the vehicle speed is less than 16 km/h (10 mph).
• Drive (D) gear is selected directly from Park (P) and the Parking aid switch is operated. The front and side sensors are activated only. The sensors will remain active until the vehicle speed is less than 16 km/h (10 mph)
• Parking aid switch is operated for 3 seconds, and the vehicle's speed decreases to less than 10 km/h (6 mph), or Reverse (R) gear is selected.

AUDIBLE WARNINGS

The Parking Aid Control Module (PACM) processes the distance readings from the ultrasonic parking aid sensors to determine if there are any objects within the detection areas. If there are no objects no audible warning will be emitted. If an object is detected, repeated audible warnings are emitted via the audio system speakers. The time delay between the audible warnings decreases as the distance between the detected object and the vehicle decreases until eventually a continuous tone is emitted from the audio system speakers.

DISTANCE CALCULATION FOR AUDIBLE WARNINGS

Parking Aid Control Module (PACM)Detection Calculation

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