US 7,567,857 B2
Control device and method for a vibratory machine
Niels Laugwitz, Koblenz (Germany)
Assigned to BOMAG GmbH, Boppard (Germany)
Filed on Feb. 25, 2005, as Appl. No. 11/64,849.
Claims priority of application No. 10 2004 009 841 (DE), filed on Feb. 29, 2004; and application No. 10 2004 015 589 (DE), filed on Mar. 30, 2004.
Prior Publication US 2005/0193843 A1, Sep. 08, 2005
Int. Cl. G06F 15/20 (2006.01)
U.S. Cl. 700—280  [701/50; 180/65.3; 68/24] 10 Claims
OG exemplary drawing
 
1. A control unit for an unbalanced mass adjusting device in a vibration generator, in particular in a soil compaction machine, having an adjusting cylinder which is hydraulically adjustable to adjust a relative position of contrarotating unbalanced masses in the vibration generator, a control valve for adjusting the adjusting cylinder so that the vibration characteristic of the vibration generator is adjusted, and a control unit for triggering the control valve according to a pulse width modulation signal to adjust the relative position of the unbalanced masses as a function of the pulse duty factor of the pulse width modulation signal, wherein the control unit is connected to the control valve to trigger the adjusting cylinder according to a first level of the pulse width modulation signal so that the relative position of the unbalanced masses is adjusted in the direction of a first defined position and to trigger the adjusting cylinder according to a second level of the pulse width modulation signal so that the relative position of the unbalanced masses is adjusted in the direction of a second defined position.