Audi active lane assistInnovative driver assistance system

“Audi active lane assist” is an evolutionary version of Audi lane assistAudi lane assistThe lane departure warning system Audi lane assist helps the driver to stay in lane, thus preventing accidents.Audi lane assist  and does not simply warn the driver before they move out of their current lane, but also actively helps them to stay in lane subject to the system limits. Directionally specific steering prompts provide the driver with a direct indication of the right response that is needed in a given situation. This makes driving on motorways and fast roads much more agreeable.

Audi Electronics Venture GmbH was mainly involved in the development of the hands-on algorithm and in the redefinition of the intervention point based on objects identified in the adjacent lane. Audi Electronics Venture GmbH helped to define the requirements and adopted a model-based software development approach for a seamless transition from prototype to tested, freely applicable software over short development cycles.

The basis for Audi active lane assist is integrated control units and systems. The mono video camera in the interior mirror detects up to eight lane markings of various types (e.g. broken and continuous) and colours (yellow or white), thus permitting high system availability, for example including through road works. This information is then processed in the control algorithm on the image processing control unit. The system determines the vehicle’s current trajectory and also whether assistance is needed. To that end, criteria such as the vehicle’s predicted movement relative to the lane and the driver’s current steering intention are evaluated. If necessary, targeted steering assistance is initiated and a controlled steering torque that intuitively assists the driver is generated by the electromechanical steering.

Depending on the Audi MMI setting, Audi active lane assist cuts in shortly before the vehicle leaves its lane or permanently assists the driver by continually providing steering prompts. When the driver follows these steering prompts, they are guided back towards the centre of the lane. If the system identifies that the driver deliberately wants to leave the lane, e.g. by operating the turn indicator or by deliberately turning the steering, it does not intervene. This makes sure it only provides assistance when necessary. Keeping the vehicle in its lane remains the driver's responsibility throughout. If the system identifies that the driver has taken their hands off the steering wheel, the system shuts down.

Audi lane assist
Audi lane assist helps the driver to stay in lane and warns them via vibrations of the steering wheel if the vehicle departs from a lane that the system has identified. The optics used are designed to have a range of up to 60 metres. Various databases containing a wide variety of driving situations have been used as references for optimizing the system. A special stress test database was applied in examining particularly challenging situations such as driving through road works or on snow-covered roads. To allow the driver to adjust the intensity and timing of steering-wheel vibration to their individual driving requirements, the steering wheel’s vibration can be adjusted over three stages for the driver (Audi lane assist, Audi Glossary).

Audi Electronics Venture GmbH was involved in the development of the warning algorithm that determines whether and when the driver is given a warning. Audi Electronics Venture GmbH helped to define the requirements and adopted a model-based software development approach for a seamless transition from prototype to tested, freely applicable software over short development cycles.

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