Work Machine Motion Restriction by Zoned Human Detection
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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 nearby.
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 work 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 travel restriction. This localized differentiation allows the work machine to maintain safety in critical zones while preserving work efficiency in less critical zones.
Solution Approach 2:
The control system dynamically adjusts the level of motion restriction based on the detection result and the specific operation being performed. When a person is detected in the first monitoring area, all motions are restricted. When detected in the second monitoring area, only travel is restricted while work operations can continue. This dynamic response optimizes both safety and productivity.
2Reliability
If the work machine restricts all motions when a person is detected, then safety is improved, but work efficiency deteriorates
Solution Approach 1:
Different monitoring areas impose different restriction levels. The second monitoring area allows work operations to continue while restricting only travel, thereby reducing work interruption time while maintaining safety through travel restriction.
Solution Approach 2:
The control system dynamically determines the appropriate restriction level based on real-time detection results and current operations. This dynamic control prevents unnecessary complete motion restrictions, reducing work interruption time while maintaining adequate safety measures.
3Reliability
If the work machine frequently enters work-disabled state, then safety is improved, but productivity deteriorates
Solution Approach 1:
The spatial differentiation of monitoring areas creates a gradient of restriction levels. By allowing work operations to continue when persons are detected in the second monitoring area (non-working area), the system reduces the frequency of complete work-disabled states while maintaining safety through travel restrictions.
Solution Approach 2:
The control system dynamically adjusts restriction levels based on detection results and operational context. This prevents unnecessary complete shutdowns and allows continuous work operations when safe, thereby improving operational productivity while maintaining safety standards.
Data Source
AI summary
A method for controlling a work machine includes executing a restriction process of restricting a motion of the work machine when a result of detection performed by a detector that detects a detection target in a monitoring area around the work machine satisfies a specific condition and a specific operation is performed on an operation device of the work machine.