Work Machine Area Restriction Using Design-Based Coordinates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing area restriction control systems for work machines, such as hydraulic excavators, face challenges in maintaining accurate area restrictions during movement, leading to potential deviations from set areas, especially when real-time adjustments are needed for construction site passageways or worker safety zones.
Innovation Solution
A controller is configured to set work areas and entry-prohibited areas based on design data representing the final intended shape of construction targets, preventing the vehicle body from deviating from the set areas by overwriting existing work areas with entry-prohibited areas when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If area restriction control is performed based on coordinates relative to the vehicle body, then the control system is simple to implement, but the restricted area displaces from the intended area when the vehicle moves
Solution Approach 1:
The patent introduces a coordinate conversion function as an intermediary between the vehicle body coordinate system and the work area coordinate system. This mediator converts coordinates from vehicle-relative to absolute space coordinates, ensuring that the restricted area remains fixed in the intended location even when the vehicle moves. The coordinate conversion acts as a bridge that resolves the conflict between simple vehicle-relative control and accurate absolute area restriction.
2Ease of operation
If the work area is set based on vehicle body coordinates, then setting the area is straightforward, but the area restriction cannot adapt when the vehicle travels to different locations
Solution Approach 1:
The patent implements dynamic area restriction by making the restricted area coordinates dependent on the vehicle's current position. Instead of using fixed vehicle body coordinates, the system continuously updates the absolute coordinates of the work area based on real-time vehicle location data. This dynamic adjustment allows the area restriction to adapt automatically as the vehicle moves to different locations while maintaining the same relative positioning logic.
3Reliability
If map data is used to reset turning angles according to vehicle position, then entry-prohibited areas can be maintained, but the system cannot handle real-time setting of temporary passageways or worker zones
Solution Approach 1:
The patent creates a universal area setting system that can handle both pre-defined map data areas and real-time temporary areas through the same coordinate conversion mechanism. The system accepts area definitions in various formats (map data coordinates, relative coordinates, absolute coordinates) and converts them all to the unified absolute coordinate system for consistent restriction control. This multi-functional capability allows the same system to reliably manage both permanent entry-prohibited areas and temporary worker zones.
Data Source
AI summary
Provided is a work machine including a controller configured to perform area restriction control for preventing a vehicle body from deviating from a work area set in a construction area. In this work machine, it is possible to easily set an area for which operation of the work machine is to be restricted in an actual space to a desired position, and to avoid displacement of the area for which the work machine is to be actually controlled from the set area. The work machine includes a controller configured to perform area restriction control for restricting operation of a vehicle body so as to prevent the vehicle body from deviating from a work area set in a construction area. The controller sets at least a part of the work area based on design data representing a final intended shape of a construction target in the construction area.