Manure Removal Slide Safety Shutdown via Dynamic Current Limits
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Solution Overview
Problem
Existing safety shutdown systems for clearing and manure removal slides often result in faulty shutdowns and inadequate detection of obstacles, leading to potential injuries and damages.
Innovation Solution
The system detects the drive current of the electric drive and sets multiple current limits, adjusting them over time to differentiate between normal operation and sudden increases caused by obstacles, allowing for precise shutdown or reversal of the slide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed current limit is used for safety shutdown, then the shutdown response is simple and fast, but false shutdowns occur due to normal load variations
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed current limit to a dynamic current limit that adapts to varying operating conditions. The current limit is continuously adjusted based on the drive current from a predetermined time ago, allowing the system to accommodate normal load variations while maintaining sensitivity to actual obstacles. This resolves the contradiction by making the shutdown threshold flexible rather than static.
Solution Approach 2:
The patent implements feedback by using the drive current history to continuously update the current limit. The control unit monitors the drive current over time and uses this information to adjust the threshold for shutdown activation. This feedback mechanism allows the system to learn normal operational patterns and distinguish them from abnormal obstacle conditions, improving detection accuracy while maintaining system simplicity.
2Ease of operation
If the current limit is adjusted to avoid false shutdowns, then false shutdowns are reduced, but obstacle detection accuracy decreases
Solution Approach 1:
The patent applies partial action by using only a portion of the drive current history (a predetermined time period) to adjust the current limit, rather than considering all historical data. This selective approach allows the system to capture recent operational patterns without overcomplicating the algorithm, maintaining obstacle detection precision while reducing false shutdowns through targeted adaptation.
3Device complexity
If a simple current threshold comparison is used, then the control system is simple, but it cannot differentiate between normal load changes and obstacles
Solution Approach 1:
The patent introduces an intermediary element - the time-dependent current limit - that mediates between the simple current threshold comparison and the need for sophisticated obstacle differentiation. This intermediary adapts the threshold based on historical current data, enabling the simple control system to effectively distinguish between normal load variations and actual obstacles without requiring complex analysis algorithms.
Data Source
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AI summary
The present invention relates to a method for the safety shutdown of a clearing and/or manure removal slide and to a system for controlling a clearing and/or manure removal slide. The object of the present invention is to improve the safety shutdown in such a way that, firstly, false shutdowns are avoided and, secondly, a higher detection accuracy of obstacles, in particular soft obstacles, and especially a faster detection of such obstacles is enabled.The problem is solved by determining a first current limit at any time in a first time period after starting up by a first predetermined surcharge on the drive current that has passed by a first time period plus a second surcharge, and at any time in a second time period by the first predetermined surcharge on the drive current that has passed by a second time period, whereby the second surcharge is reduced with increasing time distance from starting up.