Road Paver Compaction Control via GNSS and Tamper Adjustment
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Solution Overview
Problem
Conventional road paver leveling methods result in irregularities due to varying compaction performance across different layer thicknesses, leading to uneven road surfaces after compaction by rollers, as thicker layers are compressed more than thinner layers.
Innovation Solution
A road paver equipped with a Global Navigation Satellite System (GNSS) receiver, electronic control system, and sensors to automatically control the compaction performance of the paving screed, ensuring a consistent rolling dimension by varying the compaction degree based on the roadbase's irregularities, using pre-compaction degrees stored in memory and adjusting tamper frequency, stroke, vibration, or paving speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional leveling methods are used to control layer thickness, then the road surface can be leveled, but subsequent compaction by roller causes irregularities because thicker layers have higher rolling dimension
Solution Approach 1:
The patent applies preliminary action by pre-compacting the paving material to a first compaction degree before the final roller compaction. This preliminary compaction is specifically controlled to compensate for the fact that thicker layers will be compressed more by the roller, thereby ensuring uniform final compaction across the entire road surface.
Solution Approach 2:
The patent changes the compaction parameter by varying the first compaction degree based on the target layer thickness. Thicker layers receive a higher first compaction degree while thinner layers receive a lower first compaction degree, creating a parameter adjustment that compensates for differential roller compression and ensures uniform final compaction.
2Stability of the object's composition
If the thickness of paving material is increased in depression areas to compensate for roller compression, then rolling dimension can be equalized, but the change of paving height becomes difficult to control
Solution Approach 1:
Instead of changing the layer thickness parameter, the patent changes the compaction degree parameter. By adjusting the first compaction degree based on the target layer thickness, the system achieves uniform rolling dimension without requiring complex thickness adjustments, thereby simplifying the control of paving height.
Solution Approach 2:
The patent employs feedback control where the control system receives information about the roadbase profile and target layer thickness, calculates the appropriate first compaction degree, and automatically adjusts the tamper operation accordingly. This closed-loop feedback mechanism simplifies operation compared to manual thickness adjustments.
3Ease of operation
If manual control of compaction is used, then operator flexibility is maintained, but precision and consistency of compaction degree cannot be ensured
Solution Approach 1:
The system performs self-service by automatically controlling the tamper operation based on pre-stored roadbase data and target layer thickness information. The control system independently calculates and executes the appropriate first compaction degree without requiring continuous manual intervention, thereby ensuring consistent precision while maintaining operational simplicity.
Solution Approach 2:
The patent replaces manual mechanical control with an automated control system that uses electronic sensors, processors, and actuators to control the tamper operation. This substitution of mechanical manual control with automated electronic control ensures precise and consistent compaction degrees while reducing operator workload.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures a level road surface is maintained during and after compaction, with consistent rolling dimension across all areas, allowing for precise control of layer thickness and compaction, reducing operator intervention and maintaining surface regularity.
Implementation Method 1
A road paver according to the disclosure comprises a paving screed, wherein the paving screed comprises a tamper. The road paver further comprises a Global Navigation Satellite System (GNSS) receiver
Implementation Method 2
The compaction performance of the paving screed can now be controlled in such a way that where the roadbase has a depression, i.e., where a thicker layer has to be paved, the material is paved at a higher degree of compaction
Implementation Method 3
In a practical version, the road paver has a sensor for measuring an actual layer thickness of paving material, with the control system configured to calculate a deviation of the actual layer thickness from the target layer thickness
Data Source
AI summary
A road paver comprises a paving screed, wherein the paving screed comprises a tamper, and the road paver further comprises a GNSS receiver and a material conveyor. In addition, the road paver comprises an electronic control system, which comprises a memory and a data processor, wherein digital construction data, in particular a target height profile of a road surface to be paved, a target layer thickness of paving material and, if necessary, a height profile of a roadbase are stored in the memory. The control system is configured to automatically control compaction performance of the paving screed as a function of the target layer thickness in order to pave the paving material for the respective local coordinate point of the road paver determined by the GNSS receiver.