Gec Alsthom Transport Sa

Alstom Holdings

Philippe Boichot

Regis Kirat

Fabienne Bondon

Device for damping the transverse and hunting movements of a vehicle, and vehicle provided with such a device

The present invention relates to a semi-active damper controlled by a control circuit including a direct control loop made up of an inverse model of the damper. The inverse model of the damper determines an ideal value for an electrical current i.sub.th for controlling a compression controlled-restriction valve and an expansion controlled-restriction valve on the basis of a measured value for a relative speed y between the two ends of the damper and on the basis of a force reference value Fc. The semi-active damper of the invention is applicable as a transverse secondary suspension for a passenger rail vehicle.

Semi-active suspension system with control circuit having a direct

A semi-active damper is controlled by a control circuit which includes a direct main feedback loop, as well as a secondary force feedback loop. The direct main feedback loop includes an inverse model of the damper to be controlled. In the inverse model, an equivalent speed y.sub.e is determined, for use in controlling the damper, based on the measured relative speed y of the ends of the damper. The equivalent speed y.sub.e is used for the purpose of compensating for the fact that a hydraulic fluid used in the damper is not an absolutely incompressible fluid.

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Le Creusot, France

Philippe Boichot