Milling Depth Control Using Dynamic Sensor Switching
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Solution Overview
Problem
The measurement of milling depth in construction machines, particularly road milling machines or surface miners, is not sufficiently precise in all operating situations.
Innovation Solution
A second milling operation is detected by a control device, which then uses measurements from a third measuring device instead of the first and/or second measuring device to determine the milling depth, especially when the milling drum is positioned on an as yet non-milled milling cut next to a previously milled cut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If first and second measuring devices are used to determine milling depth, then the measurement system is simple, but measurement precision deteriorates when the milling drum is positioned on a non-milled milling cut next to a previously milled cut
Solution Approach 1:
The control device dynamically selects which measuring devices to use based on the detected milling operation type. In a first milling operation, the first and second measuring devices are used. When a second milling operation is detected (milling drum positioned on a non-milled milling cut next to a previously milled cut), the control device switches to using only the third measuring device, optimizing measurement precision for each specific operating condition.
Solution Approach 2:
The patent introduces a third measuring device specifically positioned to measure the distance between the machine frame and the ground pavement at a location where the milling drum is positioned on a non-milled milling cut. This local addition of measurement capability ensures high measurement precision in the specific problematic situation without requiring all measuring devices to be equally complex.
2Measurement precision
If multiple measuring devices are used to cover all operating situations, then measurement precision improves, but device complexity increases
Solution Approach 1:
The control device implements dynamic selection logic that activates different subsets of measuring devices based on the detected milling operation type. This dynamic approach ensures high measurement precision across all operating situations while avoiding the constant use of all three measuring devices, thereby managing system complexity effectively.
Solution Approach 2:
The third measuring device serves multiple functions: it provides accurate measurement in second milling operations, can supplement measurements in first milling operations, and helps detect transitions between different milling operation types. This multi-functionality reduces the need for specialized devices for each specific measurement scenario.
Data Source
AI summary
In a self-propelled construction machine (1), in particular road milling machine or surface miner, for working a ground pavement, comprising a milling drum (10), which is mounted in a machine frame, wherein a milling cut develops during milling of the ground pavement with the milling drum (10), wherein the milling drum (10) comprises a first and a second end side, at least a first measuring device, which is arranged next to the first end side of the milling drum (10) and measures the distance of the machine frame relative to the ground pavement next to the first end side of the milling drum (10), at least a second measuring device, which is arranged next to the second end side of the milling drum (10) and measures the distance of the machine frame relative to the ground pavement next to the second end side of the milling drum (10), and a control device (40) for controlling the milling depth, wherein, in a first milling operation, the control device (40) determines the milling depth by means of measurements performed by the first and the second measuring device, it is provided for the following features to be achieved: a second milling operation is detectable by means of the control device (40), in which the milling drum (10) is positioned on an as yet non-milled milling cut that is arranged next to a previously milled milling cut, wherein the control device (40), as soon as the second milling operation is detected, uses measurements performed by at least a third measuring device in lieu of the first and/or the second measuring device for determining the milling depth.