Work Machine Motion Restriction by Detection Zone and Operator Input
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Solution Overview
Problem
Work machines frequently enter a work-disabled state when a person is detected around them, leading to decreased work efficiency in environments where workers operate near the machines.
Innovation Solution
A work machine control method that restricts motion when a detection target is present in the monitoring area and a specific operation is performed on the operation device, using a restriction processor to control the machine's motion based on detection results and operation inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the work machine enters a work-disabled state when a person is detected around the work machine, then safety is improved, but work efficiency deteriorates
Solution Approach 1:
The monitoring area is divided into multiple regions (first monitoring area and second monitoring area) with different restriction levels. The first monitoring area triggers motion restriction, while the second monitoring area triggers only operation restriction. This local differentiation allows the system to maintain safety near the machine while permitting broader operational flexibility, thus improving work efficiency without compromising safety.
Solution Approach 2:
The control system dynamically adjusts the type of restriction applied based on the detection result and current operation state. When a detection target is in the first monitoring area, motion is restricted; when in the second monitoring area, only the specific operation is restricted. This dynamic response prevents unnecessary complete work disablement, allowing the machine to continue other operations and improving overall work efficiency.
2Reliability
If the work machine restricts motion whenever a detection target is present, then safety is improved, but work efficiency deteriorates
Solution Approach 1:
Instead of completely restricting all motions when a detection target is present, the system applies partial restrictions only to specific operations or specific motion directions that pose safety risks. This allows other non-critical operations to continue, reducing work interruption time while maintaining necessary safety protections.
Solution Approach 2:
The system dynamically determines the appropriate level of restriction based on the detection target's position and the current operation. By adjusting the restriction level in real-time, the system minimizes unnecessary work interruptions while maintaining safety, thus reducing loss of time.
3Reliability
If the work machine enters work-disabled state frequently, then safety is improved, but productivity deteriorates
Solution Approach 1:
The monitoring area is segmented into zones with different safety requirements. The first monitoring area (closer to the machine) triggers motion restriction, while the second monitoring area (farther away) triggers only operation restriction. This local differentiation reduces the frequency of complete work disablement, allowing continuous operation in safer zones and improving productivity.
Solution Approach 2:
The control system dynamically adjusts the restriction level based on real-time detection results and operation states. By applying the minimum necessary restriction rather than defaulting to complete work disablement, the system maintains productivity while ensuring safety.
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, each of which easily improves work efficiency, are provided. [Solution] A method for controlling a work machine 3 includes executing a restriction process of restricting a motion of the work machine 3 when a result of detection performed by a detector 13 that detects a detection target in a monitoring area around the work machine 3 satisfies a specific condition and a specific operation is performed on an operation device 5 of the work machine 3.