Integrated Sensor Carrier With Dual-Loop Screed Height Control
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Solution Overview
Problem
Existing road construction machines face high installation effort and theft risks due to the use of multiple sensor heads for distance measurement, and conventional height leveling systems fail to accurately maintain screed height due to delayed compensation.
Innovation Solution
A measuring system with a carrier that integrates multiple sensor heads, forming a mechanical and electrical connection, and a controller with dual control loops for screed adjustment, using first and second control loops to individually address disturbances at the screed and tow point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensor heads are used for distance measurement, then measurement precision is improved, but device complexity and installation effort increase
Solution Approach 1:
The patent combines multiple sensor heads (at least three) into a single integrated measuring system mounted on the screed. The sensor heads are physically and functionally merged to measure distances at multiple points simultaneously, reducing installation complexity while maintaining measurement precision through coordinated operation of the combined sensors.
Solution Approach 2:
The measuring system divides the measurement function into multiple sensor heads positioned at different locations on the screed. Each sensor head measures distance at a specific point, and the results are segmented and processed individually before being combined to determine overall screed position and orientation, improving measurement precision without requiring a single complex sensor.
2Measurement precision
If multiple sensor heads are mounted on the screed, then measurement precision is improved, but theft risk increases
Solution Approach 1:
The patent merges multiple sensor heads into a single integrated assembly that is mounted directly on the screed as one unit. This combined structure is more difficult to steal individually compared to separate sensor heads, and the integrated design makes the entire assembly a less attractive theft target while maintaining the measurement precision benefits of multiple sensors.
3Device complexity
If conventional height leveling systems are used, then device complexity is reduced, but screed height control precision deteriorates due to delayed compensation
Solution Approach 1:
The patent implements a feedback control system where the measuring system continuously monitors distances from multiple sensor heads to the ground or reference surface, and this measurement data is fed back to automatically adjust screed height. The system calculates the actual screed position and orientation based on real-time sensor data and makes immediate compensations, eliminating the delayed response of conventional systems while maintaining manageable device complexity through automated control algorithms.
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
Reduces assembly time and theft risk while ensuring precise screed height control by simultaneously measuring and adjusting the tow point based on multiple sensor values, compensating for various disturbances effectively.
Implementation Method 1
The road finishing machine includes three ultrasonic sensors 5a, 5b, 5c attached to a holder 5h. The three ultrasonic sensors 5a, 5b, 5c are used to scan a reference surface
Data Source
AI summary
The invention relates to a measuring system for a construction machine having a carrier including several portions, a measuring system for a construction machine including a calculation unit determining a regression line as well as a controller having two control loops.