Work Machine Clearance Control for Fewer Unnecessary Stops
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Solution Overview
Problem
Existing work machines, such as hydraulic excavators, frequently stop unnecessarily when attempting to avoid obstacles, leading to reduced efficiency due to the need for clearance, even when there is no actual risk of contact.
Innovation Solution
A work machine equipped with a control unit that calculates and executes control commands to stop or decelerate based on both the movement range and the position of obstacles, allowing for earlier and more precise control to avoid collisions while minimizing unnecessary stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the work machine performs stop control with clearance from approaching objects, then the possibility of contacting obstacles is reduced, but the frequency of unnecessary stops increases and work efficiency decreases
Solution Approach 1:
The patent changes the control parameter from a fixed angle interval threshold to a dynamic threshold based on turning angular velocity and moment of inertia. This allows the stop control to be more precise and adaptive, reducing unnecessary stops while maintaining safety clearance from obstacles
Solution Approach 2:
The patent introduces dynamic adjustment of the angle interval threshold based on real-time operating conditions (turning angular velocity and moment of inertia). This dynamic approach allows the system to adapt the safety margin according to the actual movement characteristics, preventing excessive stopping while ensuring safety
2Reliability
If the work machine stops frequently to avoid potential contact with obstacles, then safety is improved, but work efficiency deteriorates
Solution Approach 1:
The patent modifies the control parameters dynamically based on turning angular velocity and moment of inertia, allowing the system to maintain appropriate safety clearances without excessive stopping. This parameter adaptation reduces unnecessary time loss while preserving safety
Solution Approach 2:
The patent calculates and sets the angle interval threshold in advance based on the turning characteristics (angular velocity and moment of inertia) before the stopping decision is made. This preliminary calculation enables more accurate prediction of potential contact risks, reducing unnecessary stops and time loss
Data Source
AI summary
Provided is a work machine that can suppress decrease in work efficiency while reducing the possibility of contacting a worker or a dump truck, etc. A movement range is set in advance so as to avoid entry of a worker or a dump truck, etc. into the set movement range. The work machine performs stop control with clearance for an obstacle having entered the movement range, but performs stop control with relatively small clearance (minimum clearance) for a movement range. Thus, the work machine can reduce the frequency of stopping a body or a work implement and suppress decrease in work efficiency. Since the work machine controls the body or the work implement to stop with clearance when the worker or the dump truck, etc. enters the movement range of the work machine, the work machine can reduce the possibility of contacting the worker or the dump truck, etc.