Semi-active damper with continuous force control

US5862894A · kind A · utility

Assignee

• GEC Alsthom Transport SA · FR

Inventors

• Philippe Boichot · Le Creusot, FR
• Regis Kirat · Le Creusot, FR

Key dates

• Filing date: Jun 30, 1997
• Grant date: Jan 26, 1999
• Expiry date: Jun 30, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60G2600/1873
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

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.