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2 Lateral Dynamics (Driving Stability)
2.1 Demands on Vehicle Behavior
Like at all vehicles which are not track-bound, the driver of the motor vehicle has to
manage not only the control of driving speed, but also driving direction.
Determination of driving direction by the control activity of the driver contains three
cybernetic tasks (Fig. 2.1 -1):
Fig. 2.1 -1 Cybernetic tasks of the driver in the guidance of a motor vehicle
a) selection of route b) definition of desired course c) compliance with desired course
1) From all provided routes, a particular route based on criteria such as time need
or distance has to be selected.
2) Within the selected route the desired course has to be defined, whereby
information continuously monitored during driving (traffic in the same direction as well
as oncoming traffic, signalling systems, routing of the road) is evaluated.
3) The vehicle has to be navigated on the previously defined desired course by its
control elements.
Man undertakes function of a control device in terms of driving stability by the last
Automotive Engineering || ; Vertical and Lateral Dynamics of Vehicle
of these three functions. The vehicle represents the control travel. So the interactions
between driver action and vehicle response can be understood as operations in a
closed control loop ( Fig.2.1-2).
control device
desired course
dnvsr
actual course
additional
information
(e g sight obscuration)
controlled variable
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