Calibration of driver assistance systems

A reproducible and defined alignment of the vehicle along the line of symmetry is essential for the adjustment of driver assistance systems. The vehicle is centered pneumatically with roller rails that are applied to the inner side of the tire. Plastic rollers prevent damage to tires and rims. Our centralizers are available in different sizes, can be installed in a pit or with a platform and are equipped with additional drive-in aids on request.

The precise determination of the body height is relevant for the calibration of various DAS systems. Both our dPP and VisiScan 3D measurement probes offer the option of determining this value in parallel with the measurement of the chassis geometry. With the dPP probe, a separate illumination unit is connected directly to the sensor housing for this purpose; no further structural measures are required. The VisiScan offers the function of wheel house edge height measurement through the integrated laser scanner factory fitted.

The use of collaborative robots enables the exact and reproducible positioning of a camera in the vehicle interior, e.g. for the calibration of the head-up display. Due to its flexible programmability, the robot can be used for almost all vehicle models. After a successful risk assessment, it can also be used without a protective housing.

The NightVision target enables the reliable directional calibration of the infrared camera in the vehicle. For this purpose a calibration target, which generates a thermal reference pattern, is used. This target is brought into a defined position in front of the centered vehicle. The NightVision camera in the vehicle can determine the correct alignment using the reference pattern of the calibration target and can be adjusted accordingly. The camera mounted on the target is used for position calibration of the target.

For the ACC calibration, a reflector positioned exactly in transverse direction and height is brought into the radar lobe of the ACC antenna and reflects the radar waves back to the sensor of the ACC. Additionally, the adjustment system can be equipped with a mechanism that tilts the reflector around the Y-axis and/or rotates it around the Z-axis. This determines the deviation of the beam direction from the driving direction and allows it to be corrected accordingly.

Doppler simulator are positioned around the vehicle, e. g. to set lane change or turning assistants. They simulate an approaching vehicle by frequency shifting. The Doppler simulators can be permanently installed on the ground or can be implemented in a traversable way (e. g. on the gantry) to allow positioning in height and side.

Calibration measurement panels enable the reliable and exact calibration of camera-based systems such as the lane keeping assistant, the 360°- or rear view camera. The targets are either permanently mounted (e.g. on the ground behind or next to the vehicle) or moved on a gantry to a defined position in relation to the centered vehicle.

VisiCon has developed its own system particularly for the adjustment of light sources in the entry level area of the vehicle. The adjustment system essentially consists of two components: The light from the light carpet is projected onto a suitable surface in a tailor-made projection box and recorded from there with a VisiCon DigiCam. The software evaluates the image and determines the deviation from the set defined target position. Based on the image analysis, the adjustment unit automatically adjusts the adjustment screw of the light module until the target position is reached. The adjustment module is also equipped with a DigiCam which detects the position of the adjustment screw.

The VisiCon software is tailored exactly to the requirements of our customers. The calibration procedure is controlled centrally in one software. On one or more monitors (directly on the plant computer or on traversing columns) different displays can be provided for the user in parallel. The connection to the superordinate hall network can be realized without problems by various interfaces. If required, our systems can be controlled via a central PLC, alternatively, operation is also possible using only a measurement PC.

The VisiHAzEl (Height, Azimut, Elevation) is an extension for the master gauge to check the correct alignment of calibration componentes for DAS systems (e. g. ACC or NightVision targets, front corner radar. A laser shines on the target to be checked, is reflected from there via a mirror and captured by the photodiode in the VisiHAzEl. In this case, an LED at the VisiHAzEl lights up. The evaluation can either be performed manually or transmitted via an interface.

The DAS calibration systems are aligned with the help of a torsion-resistant master gauge. Both setup lasers and targets are mounted on this gauge. Additional setup components for headlight or wheel alignment stands can be attached.