Dual Limiting Control for Work Machine Drive Unit Abnormalities
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Solution Overview
Problem
The reliability of work machine movement is compromised when an abnormality occurs in the electromagnetic proportional valve, leading to inadequate control of drive unit movement, especially when detecting targets, which can result in reduced safety and efficiency.
Innovation Solution
A dual limiting system is implemented, where a first limiting unit controls drive unit movement and a second limiting unit acts as a backup to ensure movement limitation even if the first unit fails, using processors to determine abnormalities and activate the second unit accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single limiting unit is used to control drive unit movement, then the device complexity is low, but the reliability of movement limitation is reduced when abnormality occurs
Solution Approach 1:
The limiting system is segmented into a first limiting unit and a second limiting unit, where the first limiting unit handles normal operation and the second limiting unit handles abnormality conditions. This segmentation allows the system to maintain high reliability through redundancy while keeping each individual unit relatively simple in structure.
Solution Approach 2:
The second limiting unit is prepared in advance as a backup mechanism. When abnormality is detected in the first limiting unit, the second limiting unit immediately activates to ensure continuous reliable limitation of drive unit movement. This prior cushioning approach ensures that reliability is maintained without requiring complex real-time decision-making during critical moments.
2Measurement precision
If the electromagnetic proportional valve is used to limit drive unit movement, then the control precision is improved, but the reliability is reduced when abnormality occurs in the valve
Solution Approach 1:
The abnormality determination unit acts as an intermediary between the first limiting unit and the second limiting unit. It monitors the status of the electromagnetic proportional valve and other components, and when abnormality is detected, it triggers the second limiting unit. This intermediary mechanism ensures that the precision control provided by the electromagnetic proportional valve is maintained during normal operation while providing a reliable backup when abnormalities occur.
3Reliability
If a dual limiting system with abnormality determination is implemented, then the reliability of movement limitation is improved, but the device complexity increases
Solution Approach 1:
The control system is segmented into distinct functional modules: the first limiting unit for normal operation, the second limiting unit for abnormality conditions, and the abnormality determination unit for monitoring. This segmentation allows each module to be independently designed and maintained with relatively simple logic, reducing the overall system complexity despite the increased reliability.
Solution Approach 2:
The abnormality determination is performed continuously in advance to detect potential failures before they affect movement limitation. By preparing the second limiting unit in advance based on predetermined conditions, the system avoids complex real-time decision-making during critical moments, thereby managing system complexity while ensuring high reliability.
Data Source
AI summary
The work machine control method includes actuating a first limiting unit, determining whether or not the first limiting unit has an abnormality, and actuating a second limiting unit based at least on a determination result of determining whether or not the first limiting unit has an abnormality. The first limiting unit limits a movement of a drive unit that drives a work machine. The second limiting unit limits the movement of the drive unit separately from the first limiting unit.