Paver Screed Density Sensor for Real-Time Asphalt Control
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Solution Overview
Problem
Current systems for measuring asphalt mat density during paving operations lack efficiency and accuracy, and are not integrated into the paving process in real time.
Innovation Solution
A paving machine equipped with a density sensor coupled to the screed, which measures asphalt mat density and sends data to a controller to automatically adjust operating parameters, such as screed down-pressure, paving machine speed, and auger height, to achieve a desired density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current density measurement systems are used, then density measurement is possible, but measurement precision and efficiency are insufficient
Solution Approach 1:
The density sensor is positioned on the screed to measure asphalt mat density immediately as it is being laid, before the paving process completes. This preliminary measurement allows for real-time feedback and adjustment, eliminating the need for post-paving density testing and improving both measurement precision and overall paving efficiency.
Solution Approach 2:
The system incorporates a controller that receives density measurements from the sensor and automatically adjusts paving machine operating parameters to maintain desired density levels. This closed-loop feedback mechanism ensures high measurement precision while improving productivity through automated control, reducing manual intervention and rework.
2Extent of automation
If density measurement is integrated into the paving process, then real-time control is achieved, but device complexity increases
Solution Approach 1:
The density sensor and controller are integrated into the existing screed and paving machine systems, allowing these components to serve multiple functions: the screed both compacts the asphalt and houses the density sensor, while the controller manages both density measurements and overall paving operations. This multi-functionality reduces device complexity despite the added automation capabilities.
Solution Approach 2:
The system is designed to be self-regulating, with the controller automatically adjusting operating parameters based on sensor feedback without requiring constant operator intervention. The paving machine essentially monitors and corrects its own performance, reducing the need for complex manual control systems and operator training.
Data Source
AI summary
A paving machine can include a frame; a screed coupled to the frame; and a density sensor coupled to the paving machine and configured to measure a density of an asphalt mat as the screed passes over the asphalt mat.