Patent ID: 6981558
Filing Date: 2006-01-03
Classification: B06B,E01C,E02D

Abstract:
1. A controller for an unbalanced mass-adjusting unit in a vibration exciter, comprising: an adjusting piston which can be actuated hydraulically for the purpose of changing the relative position of unbalanced masses in the vibration exciter; a reference piston whose first side is hydraulically coupled to one side of the adjusting piston; a signal-generating device for the purpose of generating an electrical position signal in dependence upon a position of the reference piston; a control device which can be influenced by the electrical position signal and by an operating signal which is provided by an operator, wherein the control device generates a control signal in dependence upon the electrical position signal and the operating signal; and a pilot valve which is coupled to the reference piston for the purpose of controlling a supply of oil from a pressure oil source or controlling a discharge of oil to an oil return line on a second side of the reference piston, wherein the position of the pilot valve can be changed in dependence upon the control signal of the control device.