Abstract
The conflict of objectives in vertical suspension control could be significantly eased by adjusting the settings of stiffness and damping according to the actual driving state. With an adaptive reference model based control emulating a passive suspension with time-varying stiffness and damping coefficient this can be realized using an active or hybrid suspension system. The concept offers huge benefits in comfort for smooth and uncritical excitations. However, in safety critical situations the possibilities for a safety-oriented setting are limited to the dynamic wheel load Pareto-optimal configuration reachable of passive suspensions. Using road profile information, gained by vertically sampling the road underneath the vehicle, a wheel load optimal disturbance compensation can be derived and is applied to a semi-active and hybrid suspension system. Applying this transparent feedforward control law in combination with a reference model based control, dynamic wheel load deviations can be significantly reduced while additionally reducing chassis accelerations.
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