The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 19, 1996
Filed:
Dec. 14, 1993
Hartmut Geiger, Garbsen, DE;
Reinhard Gocz, Seelze, DE;
Uwe Lentz, Neustadt, DE;
Johann Lucas, Hannover, DE;
Dieter Zimpel, Neustadt, DE;
Wabco Standard GmbH, Hannover, DE;
Abstract
A pressure fluid operated ride leveler which adjusts the actual level of a vehicle body relative to a vehicle axle to a desired level, includes a pressure fluid source and a pressure fluid sink, pressure fluid chambers which support the vehicle body, and a pressure fluid conduit connecting the pressure fluid chambers to either the pressure fluid source or the pressure fluid sink. First and second controllable valve mechanisms are disposed in the pressure fluid conduit. The second valve mechanism is, e.g., a controllable throttling valve, capable of reducing the diameter of the pressure fluid conduit. Both the first and second valve mechanisms are actuated by a control unit. The control unit actuates the first valve mechanism to connect the chambers to the pressure fluid source or the pressure fluid sink based on the difference between the actual level of the vehicle body and the desired level. When the difference between the actual level and the desired level becomes less than a predetermined value, the control unit actuates the second valve mechanism, thereby reducing the diameter of the pressure fluid conduit and slowing down the delivery or withdrawal of pressure fluid. In this way, overshoot of the desired level is avoided and the number of adjustment steps is reduced.