US 11,772,445 B2
Construction machine, particularly road milling machine, and method for controlling the stroke position of a piston-cylinder unit of a lifting column of a construction machine
Joachim Ponstein, Boppard (DE)
Assigned to BOMAG GMBH, Boppard (DE)
Appl. No. 17/309,839
Filed by BOMAG GMBH, Boppard (DE)
PCT Filed Dec. 17, 2019, PCT No. PCT/EP2019/000342
§ 371(c)(1), (2) Date Jun. 23, 2021,
PCT Pub. No. WO2020/135921, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 10 2018 010 153.4 (DE), filed on Dec. 28, 2018.
Prior Publication US 2022/0072922 A1, Mar. 10, 2022
Int. Cl. B60G 17/015 (2006.01); E01C 23/088 (2006.01); E01C 23/12 (2006.01)
CPC B60G 17/015 (2013.01) [B60G 2202/413 (2013.01); B60G 2300/09 (2013.01); B60G 2400/252 (2013.01); B60G 2500/30 (2013.01); B60G 2800/914 (2013.01); E01C 23/088 (2013.01); E01C 23/127 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A construction machine, comprising:
a machine frame;
a traveling mechanism with front and rear traveling devices with at least one pair of front traveling devices and/or a pair of rear traveling devices, at least one pair of the front or rear traveling devices being connected to the machine frame via lifting columns each having a respective hydraulically adjustable piston-cylinder unit;
a drive device for driving the hydraulically adjustable piston-cylinder unit of the lifting columns separately from one another;
a control device configured to control the lifting adjustment of the lifting columns by the hydraulically adjustable piston-cylinder units;
wherein at least one piston-cylinder unit of a pair of the front or rear or right or left traveling devices is assigned a measuring device which is configured to measure and monitor a volume change of a volume of a reference fluid which correlates with the current lifting position of the piston-cylinder unit, and that the control device controls the actuating position of the piston- cylinder unit of the pair of traveling devices as a function of the volume change of the reference fluid determined by the measuring device; and
wherein the measuring device is arranged on a measuring piston-cylinder unit separate from the piston-cylinder unit that sets the position of the lifting column or drives its change.