Road Paver Edge Follower Timing for Precise Lane Alignment
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Solution Overview
Problem
The spatial separation between edge detection and alignment in road construction machines leads to inconsistent paving or milling results due to varying driving speeds, causing grooves or overlaps between adjacent lanes or strips.
Innovation Solution
A method where the driving speed of the road construction machine is recorded and transmitted to a control device, which calculates a time delay for alignment based on the speed and sensor position, ensuring precise alignment at the detected edge, compensating for spatial offset and maintaining consistent results across different speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the edge follower is arranged in front of the screed to detect the edge before paving, then the alignment can be initiated early, but the spatial separation between detection and alignment causes inconsistent results due to varying driving speeds
Solution Approach 1:
The edge follower detects the edge position in advance before the screed reaches it, and the control device calculates the required time delay based on driving speed. This preliminary detection combined with speed-based timing compensation allows the system to initiate alignment preparation early while compensating for the spatial offset, resolving the contradiction between early detection and precise alignment.
Solution Approach 2:
The control device dynamically adjusts the time delay for alignment based on the detected driving speed. When the driving speed changes, the time delay is recalculated to maintain proper synchronization between edge detection and screed alignment, ensuring consistent lane joining quality regardless of speed variations.
2Productivity
If the driving speed varies during operation, then productivity is improved, but the alignment between detected edge and screed position becomes inconsistent causing grooves or overlaps
Solution Approach 1:
The control device continuously receives feedback from the edge follower about edge position and from the speed sensor about driving speed. Based on this real-time feedback, the control device dynamically calculates and adjusts the time delay to maintain accurate alignment between the screed and the detected edge, ensuring consistent lane joint quality even when driving speed varies.
Solution Approach 2:
The system changes the time delay parameter dynamically based on the detected driving speed. By adjusting this temporal parameter in response to speed variations, the system maintains the correct spatial relationship between the detected edge and the screed position, preventing grooves and overlaps while allowing productivity to vary with speed.
Data Source
Figure 1~2
AI summary
Road construction machines are used for the production and removal of road surfaces. To prevent rutting during production, the road construction machine is equipped with an edge follower. However, the edge follower detects an edge before the actual installation of the road material, resulting in the alignment of the road construction machine being spatially offset from the point of edge detection. The application provides a method, a road construction machine (10), and an edge follower (19) with which the alignment of the road construction machine can be carried out in a precise and reliable manner. This is achieved by detecting the travel speed of the road construction machine for alignment purposes and transmitting this data to a control unit (20).