Driver Assistance Systems - Audi A8 2019 Service Training

Driver assistance systems

Adaptive cruise assist
Introduction
Adaptive cruise assist is a new driver assist system which is
offered for the first time in the Audi A8 as optional equip-
ment. It combines three formerly independent systems -
adaptive cruise control, Audi active lane assist with "early"
corrective steering point and traffic jam assist - in a single
driver assist system.
Adaptive cruise control (ACC)
With adaptive cruise assist, a combined longitudinal and
lateral control assistance function is available for the first
time at speeds ranging from 0 to 155.3 mph (0 to 250
km/h). "Longitudinal control" involves accelerating and
braking the vehicle, while "lateral control" involves steering
the vehicle. However, the driver must keep his hands on the
steering wheel.
With adaptive cruise assist, both longitudinal and lateral
control functions are available to the driver. However, the
driver can also deactivate the lateral control function so
that only the longitudinal control function stays active. The
vehicle behaves in much the same way as previously when
driving with ACC. The longitudinal control function in the
2019 A8 is largely identical to the 4th generation ACC
system used in the 2017 Audi Q7 and in the 2018 Audi A4/
A5. With adaptive cruise assist, it is not possible to deacti-
vate the longitudinal control function while the lateral
control function is active.
Reference
For further information about adaptive cruise assist, refer to eSelf-Study Program
Assistance Systems.
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System configuration in the 2017 Q7 and 2018 A4
Audi active lane assist
"early" corrective steering point
Adaptive cruise assist
System configuration in the 2019 A8
With the introduction of adaptive cruise assist, active
lateral control of the vehicle is available at all speeds up to
155.3 mph (250 km/h). In the Audi Q7 or the Audi A4/A5,
lateral control is the task of Audi active lane assist at
65 kph or higher. At speeds of less than 60 kph, it is the
task of traffic jam assist if a traffic jam situation has been
detected by the system. Lateral control may be interrupted
for several seconds at the transition from active lateral
control by Audi active lane assist to active lateral control by
traffic jam assist, and vice versa. This interruption does not
apply to adaptive cruise assist, where lateral control is
provided continuously.
Because adaptive cruise assist is a driver assistance system,
the driver is still fully responsible for operating the vehicle.
The driver's hands must stay on the steering wheel. The
system assists the driver, but does not relieve the driver of
responsibility. Adaptive Drive Assist reduces the driver's
workload and makes for more comfortable driving.
Traffic jam assist
990393, The 2019 Audi A8 Driver
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