Engineering Transactions, 55, 2, pp. 155–180, 2007

Improvement of Handling by Means of Active Suspension Control

T. R. ORI
Institut National Polytechnique Houphouët Boigny

M. N. ICHCHOU
Ecole Centrale Lyon

P. GBAHA
Institut National Polytechnique Houphouët Boigny

L. JEZEQUEL
Ecole Centrale Lyon

Brake systems have become increasingly complex. They must not only slow down or stop
a vehicle under extreme conditions within short distances, but also reduce the effort exerted
by the driver. This phenomenon is difficult to approach because it depends on the vehicle’s
architecture. This is why, in this paper, the first part will give the basis for modelling of the
complete vehicle including the frame and the tires, in a 3D format. A 2D control law model will
be synthesized to obtain the best performances for road behaviour. This control law is based
on the theory of Linear Quadratic control (LQ). It is also extended to cover the 3D vehicle
model. The last part gives the numerical simulation results which demonstrate the effectiveness
of this law for vehicle performances.
Keywords: active suspensions, optimal control, brakes, vehicle dynamics, angular dynamics, comfort
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