Road Milling Machine Sensing for Accurate Worked Volume
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing self-propelled construction machines, such as road milling machines, face inaccuracies in determining the volume of material worked due to the distance between the profile sensor and the working device not accounting for relative movements and changing inclinations during operation.
Innovation Solution
A second sensor device measures the distance between the ground surface and the working device, allowing the ground pavement profile data to be referenced accurately, thereby correcting for longitudinal and transverse inclinations and ensuring precise determination of the worked volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the profile sensor device measures ground profile data at a location in front of the working device, then profile data can be collected, but the distance between measurement location and working location causes deviations when the machine exhibits longitudinal inclination or changes inclination during movement
Solution Approach 1:
The second sensor device acts as an intermediary that bridges the spatial gap between the profile measurement location and the working device location. By measuring the actual distance at the working location and using this intermediate value to reference the profile data, the system accurately associates profile measurements with their corresponding working depths despite the spatial separation.
Solution Approach 2:
The profile sensor device performs preliminary measurement of the ground surface before the working device reaches the same location. This preliminary action allows advance detection of profile characteristics, and the second sensor device ensures this preliminary data is correctly correlated with the actual working conditions when the working device arrives at the measurement location.
Data Source
AI summary
In a self-propelled construction machine comprising a working device (e.g. milling drum) and a profile sensor device arranged in front of the milling drum as seen in the direction of travel, the following features are achieved: the profile sensor device measures ground pavement profile data in at least one first location, wherein at least one second sensor device is provided which, after the construction machine has traversed a section corresponding to the distance between the milling drum and the profile sensor device, measures or otherwise determines, in at least one point associated with the first location, at least one distance value between the ground surface and the milling drum, wherein a machine control system correlates the determined distance value for the at least one point with a corresponding at least one point associated with the measured ground profile data.