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Assistent 12 - Calibration



For the workshop, a camera is added into this system, which then requires calibration, if something changes it's position in relation to the vehicle. Thereby, the precise adjusting of the rolling-, pitching- and yaw-angle is very demanding. At least there are no manual adjustments to be made, the calibration is done by the system itself.

At the top, in figure 1, you can see the system set-up for calibration. The geometrical shapes on the calibration board, stand out in strong contrast to the background and help with the automated procedure. The position of the board must however, remain in the exactly determined position in front of the vehicle. Some of the tools can also be used to adjust the distance regulation.

This by the way, is different with the night vision-camera. In this case, a different calibration board is needed, because this e.g., must be able to be heated. Also, this is aligned using the customary method, eg., with a spirit-level. So, the often cited adjustment screws and the crosshairs still dominate. The final result of an, in all directions, well aligned camera, is however the same.

Let's get back to the track-assistant. As you can easily see in the above picture, a wheel-alignment station is necessary. When a calibration must be made, can be easily calculated, e.g., whenever the position of the camera has changed, through replacing the windscreen, or the suspension of the car has been lowered. Quite simply, when the relationship car/road-surface changes.

Thus, the preparation for calibration is similar to an axle-alignment. Included in this is the rim-balance compensation, at least on the rear wheels and the measuring of the vehicle height in relation to the suspension. The system helps during the adjusting of the calibration board. In addition to the work done in the workshop, the system can also, during the trip, carry out certain corrections, which of course, must be considered before a calibration is undertaken.

In the meantime, the camera is also used for the light-adaptation. It even enables infinitely variable dipping in the case of oncoming traffic and recognises situations where the respective area to be lit-up changes, e.g., at road junctions. Although it is actually, only capable of picking up black-and-white values, it can, in the meantime, also recognise colours, thus e.g., it can distinguish between a road-works and a normal road.

Together with the appropriate software, it will allow a certain amount of crossing over road-markings, more with broken- than with solid lines. Should there be only one solid line on a one lane road, then the system will prevent the vehicle from crossing this line. When warnings are given, is to a certain extent adjustable. Should they turn out to be necessary, they can, e.g., take on the more humane form of a slight fluttering in the steering. 04/13


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