Variable Vehicle Dynamics Design-Objective Design Methods
The goal of this thesis has been to study the behaviour
of the closed loop driver-vehicle-environment in simulation and to
find parameters of the synthetic vehicle model, which minimise
certain optimisation criteria. A method of optimising parameters
using genetic algorithms has been implemented and has proven to
work well. Two different driving strategies have been tried in the
optimisation of an ISO lane-change manoeuvre. The first approach
has simulated a beginner driver and his or her behaviour. The
second approach simulates an experienced driver and also the
possibility of driver adaption to different vehicle types. The
implemented driver model has shown to be sufficient to describe
the driver´s behaviour during lateral manoeuvres. A parameter set
which minimises the lateral acceleration response on steering
wheel angle has proven to be the optimum. This includes a small
steering wheel ratio, and a small but positive under steer
gradient. The driver has demonstrated the ability to adapt to
different vehicles, and therefore different parameter sets,
describing the driver, should be used for different problems.
Magnus Oscarsson
2003
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