Work Machine Drive Limiting Control with Abnormality Failover
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Solution Overview
Problem
Existing work machines face reliability issues when an abnormality occurs in the electromagnetic proportional valve, leading to incorrect control of drive units and potential collisions with detection targets.
Innovation Solution
Implement a dual limiting system comprising a first limiting unit and a second limiting unit to independently control the movement of drive units, with a determination processor to assess the first limiting unit's functionality and adjust the second limiting unit accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single limiting unit is used to control drive unit movement, then the control system is simple, but the reliability decreases when the limiting unit has an abnormality
Solution Approach 1:
The control system is divided into multiple independent limiting units (first limiting unit 48 and second limiting unit 49), each capable of independently controlling drive unit movement. This segmentation ensures that if one limiting unit has an abnormality, the other can still perform safety control functions, thereby improving reliability without requiring a completely redundant complex system.
Solution Approach 2:
The determination processor performs preliminary detection of abnormalities in the first limiting unit before they can affect safety control. By continuously monitoring the operational status of the first limiting unit and detecting potential failures in advance, the system can switch to the second limiting unit proactively, ensuring continuous reliable control.
2Reliability
If the first limiting unit is used for normal operation, then the ease of operation is good, but the reliability is reduced when the first limiting unit has an abnormality
Solution Approach 1:
The determination processor continuously provides feedback on the operational status of the first limiting unit. When an abnormality is detected, the system automatically switches control to the second limiting unit, ensuring that the operator is always working with a functional control system. This feedback mechanism maintains ease of operation by preventing the operator from using a faulty limiting unit while ensuring reliability through automatic failover.
3Reliability
If no abnormality detection is implemented, then the device complexity is low, but the reliability of movement limitation is reduced
Solution Approach 1:
The first limiting unit performs self-diagnosis through the determination processor, which automatically detects abnormalities in its own operational status. This self-service capability allows the system to monitor its own health without requiring external complex monitoring systems, improving reliability through automatic abnormality detection while keeping the added complexity minimal.
Data Source
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AI summary
[Problem] A work machine control method, a work machine control program, a work machine control system, and a work machine that can improve the reliability of the movement of the work machine are provided. [Solution] The work machine control method includes actuating a first limiting unit 48, determining whether or not the first limiting unit 48 has an abnormality, and actuating a second limiting unit 49 based at least on a determination result of determining whether or not the first limiting unit 48 has an abnormality. The first limiting unit 48 limits a movement of a drive unit that drives a work machine 3. The second limiting unit 49 limits the movement of the drive unit separately from the first limiting unit 48.