Compaction Path Overlap Control for Irregular Worksite Coverage
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Solution Overview
Problem
Existing path planning systems for compaction machines fail to efficiently compact irregularly shaped areas without leaving gaps or overcompacting, leading to inefficient work outcomes.
Innovation Solution
A control system for construction machines that generates an edge-to-edge work plan with variable path overlap and vibration management, using sensors and a controller to adjust path width and vibration based on work parameters and surface characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fixed path overlap distance is used, then path planning is simple, but compaction coverage is incomplete or has overcompacted areas
Solution Approach 1:
The patent applies dynamics by making the path overlap distance variable rather than fixed. The system dynamically adjusts the overlap distance between paths based on the machine's position relative to the worksite boundaries and the shape of the worksite area. This allows the compaction machine to maintain precise edge-to-edge coverage throughout the entire worksite, adapting the overlap parameter in real-time to match the changing spatial requirements of irregularly shaped areas.
Solution Approach 2:
The patent implements parameter changes by modifying the overlap distance parameter along the path. The system changes the overlap distance parameter dynamically based on the machine's location and the worksite geometry, ensuring optimal compaction coverage. This parameter adjustment allows the system to transition from simple fixed-overlap planning to complex adaptive planning that handles irregular worksite shapes effectively.
2Reliability
If path overlap is increased to ensure complete coverage, then compaction coverage is improved, but vibration application becomes excessive and causes overcompaction
Solution Approach 1:
The patent applies local quality by differentiating the vibration application based on the local position within the worksite. The system identifies areas with high path overlap (such as central regions of irregular worksites) and reduces or eliminates vibration in those specific locations. This localized adjustment ensures that edge-to-edge compaction is achieved without causing overcompaction through excessive vibration in already-overlapped areas.
Solution Approach 2:
The system implements periodic action by controlling vibration application based on the machine's position along the path. Vibration is applied periodically - activated in certain path sections where single-pass coverage is needed, and deactivated in overlap sections where multiple passes provide sufficient coverage. This periodic on/off vibration pattern prevents continuous vibration from causing overcompaction while maintaining reliable coverage where needed.
3Productivity
If vibration is applied throughout the entire path, then compaction effectiveness is maximized, but energy consumption increases and causes overcompaction in overlap areas
Solution Approach 1:
The patent applies partial action by providing vibration only where and when it is needed for effective compaction. Instead of continuous vibration throughout the entire path, the system provides vibration partially - specifically in non-overlap sections where single-pass compaction is required. In overlap sections, vibration is reduced or eliminated because the cumulative effect of multiple passes provides sufficient compaction without requiring additional vibration energy.
Data Source
AI summary
A control system for a construction machine is disclosed. The control system may comprise a controller configured to: receive work parameters associated with working of the worksite surface by a surface-working member; generate an edge-to-edge work plan of the worksite surface, the edge-to-edge work plan comprising a plurality of paths each having a center-line-of-travel, wherein one of the plurality of paths includes a first outer edge defined by a first boundary side and another includes a second outer edge defined by a second boundary side; and activate the construction machine to traverse the center-line-of travel of each of the plurality of paths. The plurality of paths may comprise a first path and a second path that includes a second path overlap-section that overlaps the first path, wherein a width of the second path overlap-section varies along a length of the second path.