Arrangement for controlled damping of pivoting movements in an articulated bus

Claim 1

Arrangement for controlled damping of pivoting movements in a vehicle with two vehicle units pivotally joined to each other, particularly an articulated bus, comprising at least two hydraulic dampers arranged between the vehicle units, a hydraulic control system hydraulically connected to the dampers, an electrical control system electrically connected to electrically operated valves in the hydraulic control system and to a number of sensors sensing various vehicle parameters, of which the vehicle speed is one parameter, the pivot angle between the vehicle units is another parameter and the direction of pivoting between the vehicle units is a third parameter, said electrical control system being arranged, via said electrically operated valves to connect in the connecting lines between the dampers in the hydraulic control system various throttles, representing various levels of throttling, in response to parameter values representing both the pivot angle and the vehicle speed said hydraulic control system further including electically operated bypass valves and said electrical control system is arranged, in response to signals indicating the direction of pivoting between the vehicle units, at least at vehicle speeds below a predetermined value, to actuate said bypass valves when the vehicle units are unfolded towards alignment with each other.