Operation principle of highway assist
Highway assist is a partially automated driving function for a speed range of up to 180 km/h (112 mph) on highways. It combines and fuses the radar-based longitudinal guidance of adaptive cruise control (ACC) with the video-based lateral guidance of lane keeping assist in one system.
Optionally, highway assist can be supplemented with an automatic lane change function in a speed range of 60 – 130 km/h (35 – 80 mph), which requires the driver only to indicate a desire to change lanes using the turn signal. Then the system performs the maneuver as soon as it is safe to move into the adjacent lane. This technology requires additional radar sensors to monitor the traffic to the rear and side of the vehicle. However, the driver retains full responsibility for the vehicle and must be able to take over control of the vehicle at any time.
Even more relaxed and comfortable driving – off the pedal and hands-free
The next step is highway assists that allow drivers to take their hands off the wheel. We are currently developing such hands-free systems for the Asian and U.S. markets. At present, it is only there that such systems are legally permissible.When the highway assist - hands-free is activated, the driver’s hands are allowed to be taken off the steering wheel when indicated by the system. However, the driver remains responsible for the driving task and thus also for monitoring the correct functioning of the system. A driver monitoring system is used to supervise the behavior of the driver’s eyes. If the driver appears to be distracted from his supervision task, warnings will be conducted and the function will be finally disengaged. The system includes a reliable and fast hands-on detection by using a capacitive steering wheel, which recognizes the hand when touching the wheel. This feature can be integrated into a system with and without an automatic lane change function.