Paving Screed Height Control for Surface Smoothness
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Solution Overview
Problem
Current paving technologies face challenges in achieving smoothness of paving surfaces due to limitations in pre-paving surface preparation and machine controllability, leading to irregularities that are difficult to compensate for, and existing smoothness measurement tools like profilographs are expensive and unwieldy.
Innovation Solution
A method and system that utilize screed control data to adjust the height of a paving machine's screed in real-time, using sensors and an electronic control unit to determine and improve the smoothness of the paving material by varying the thickness of the material deposited, thereby attenuating irregularities in the surface profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional profilographs are used to measure smoothness, then measurement accuracy is achieved, but equipment cost and complexity increase
Solution Approach 1:
The patent uses screed control data (a copy of the actual paving process parameters) to determine smoothness values, replacing the need for physical profilograph measurements. This data copying approach allows smoothness assessment without expensive measurement equipment.
Solution Approach 2:
The patent substitutes mechanical profilograph measurements with an electronic control system that processes screed position data to calculate smoothness values, eliminating the need for physical measurement devices during the paving process.
2Manufacturing precision
If pre-paving surface preparation is increased to improve smoothness, then surface smoothness improves, but preparation time and cost increase
Solution Approach 1:
The patent performs preliminary actions by adjusting screed height before the paving machine deposits material, based on predicted smoothness values from historical data. This proactive approach prevents irregularities rather than requiring extensive post-preparation corrections.
Solution Approach 2:
The patent uses feedback from historical paving data and predicted smoothness values to automatically adjust screed height in real-time, replacing the need for time-consuming manual surface preparation and allowing continuous paving operations.
3Manufacturing precision
If screed height is varied to compensate for surface irregularities, then smoothness improves, but control complexity increases
Solution Approach 1:
The patent implements self-service control where the paving system automatically adjusts screed height based on predicted smoothness values derived from historical data patterns, eliminating the need for complex manual control systems and expert intervention.
Solution Approach 2:
The patent changes the control parameter from manual screed height adjustment to automated adjustment based on predicted smoothness values, using historical data patterns to determine optimal screed positions without requiring complex real-time analysis systems.
Data Source
AI summary
A paving system includes a machine having a frame with a plurality of ground-engaging elements coupled with the frame, and a height adjustable screed coupled with the frame. The paving system may also include a paving control system having a receiver configured to receive screed control data indicative of a position of the height adjustable screed relative to a reference position. The paving control system may further include a computer readable memory storing a control algorithm, which may include a smoothness estimating algorithm and a screed adjusting algorithm. An electronic control unit is coupled with the computer readable memory and is configured via the control algorithm to determine a smoothness value for a region of a mat of material which corresponds with an irregular pattern of screed position, in response to screed control data received via the receiver.