US 12,264,442 B2
Levelling system for a road construction machine
David Shelstad, Peachtree City, GA (US)
Assigned to MOBA Mobile Automation AG, Limburg (DE)
Filed by MOBA Mobile Automation AG, Limburg (DE)
Filed on Mar. 1, 2022, as Appl. No. 17/683,953.
Application 17/683,953 is a continuation of application No. PCT/EP2020/075731, filed on Sep. 15, 2020.
Claims priority of application No. 19198712 (EP), filed on Sep. 20, 2019.
Prior Publication US 2022/0220676 A1, Jul. 14, 2022
Int. Cl. E01C 19/48 (2006.01); E01C 23/088 (2006.01); E01C 23/12 (2006.01)
CPC E01C 19/4873 (2013.01) [E01C 23/088 (2013.01); E01C 23/127 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A road construction machine, especially a paving machine or a milling machine, comprising a levelling system, the road construction machine comprising a chassis and a tool, the levelling system comprising:
a first height sensor arrangement coupled to a first side of the tool or to a first side of the chassis of the machine and configured to determine a first distance information as first actual value for a distance to an underground or to an applied layer in reference to a reference point belonging to the first side of the tool or to the first side of the chassis; and
a second height sensor arrangement coupled to the second side of the tool or to a second side of the chassis and configured to determine a second distance information serving as second actual value for a distance to the underground or to the applied layer in reference to the reference point belonging to the second side of the tool or to the second side of the chassis; and
a first controller comprising a first independent controller loop configured to control a height position of the first side of the tool or of the machine chassis based on the first actual value for said distance to the underground or to the applied layer and a first setpoint set point for the height position of the first side of the tool or of the chassis; and
a second controller comprising a second independent controller loop independent from the first independent controller loop and configured to control a height position of the second side of the tool or of the chassis based on the second actual value for said distance to the underground or to the applied layer and a second setpoint set point for the height position of the second side of the tool or of the chassis; and
an additional sensor coupled to the tool or the chassis and configured to determine an actual reference value for either the first or the second side of the tool or either the first or the second side of the chassis-, the actual reference value describing a height position of either the first or the second side of the tool or either the first or the second side of the chassis;
wherein the first controller is configured to adapt the respective first set point based on the actual reference value of the additional sensor for a set point adaption and the second controllers are controller is configured to adapt the respective setpoint set point based on the actual reference value of the additional sensor for the set point adaption, wherein the setpoint set point adaption performed by the first or the second controller takes place only either on the first side or the second side of the tool or of the chassis.