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Thursday, 31 May 2018 08:32

ASA Partners With Bosch for 5th, Final Webinar: Recalibrating Driver Assistance Systems

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Calibration of a steering angle sensor may be needed after airbag deployment, structural repairs or a wheel alignment. This is important because the steering angle sensor controls the lane keep assist, blind spot detection and adaptive lighting. Watson continued to discuss the use of and when calibration is needed on the following: adaptive lighting systems (after suspension or structural repairs, headlight replacement or windshield replacement), blind spot sensors (removal of the sensor, removal of the bumper cover or damage to mounting locations) and forward radar sensors (after replacement of a forward radar sensor but possibly after removal of front bumper/grille, after front structural repairs, or after removal and installation of the forward radar unit).


Utilizing multiple cameras to provide a bird’s-eye view of the vehicle, the 360 degree camera view requires calibration of all the cameras after the replacement of any of the cameras. However, some OEMs may also require calibration when a side mirror, bumper cover or door is removed. Forward-facing cameras almost always require a calibration or aiming procedure after replacement, but aiming may also be required after removal of the windshield, rearview mirror or the camera itself. 


“When vehicle repairs containing ADAS integration is done, there is a danger of misalignment, which can have a significant effect on the efficient functioning of the system,” Watson said. “If the camera or sensors are out by even a few millimeters, it can mean the difference between a vehicle avoiding a collision or not. Dynamic ADAS calibration is carried out with the use of a hand-held device plugged directly into the car. Often, the vehicle manufacturer will stipulate specific parameters for calibration of their dynamic ADAS. Static ADAS calibration is carried out in a workshop environment on a level surface. This form of calibration requires specialized equipment. Each car manufacturer requires different calibration settings for their static ADAS.”


Looking at the camera system, Watson demonstrated that the light reflecting off an object in front of a lens passes through the lens and is collected at a focal point before it passes to a charge coupled device (CCD), which then collects the light and sends it to a capacitor which, in turn, sends it to the amplifier where it is converted to voltage. The voltage is then sent to the controller for calculation. The controller will use multiple recordings over a given time period to calculate distance and identify deviation from normal conditions based on location, speed and distance using an algorithm.