Excavator Control System Using Stored Ground Shape Data During Signal Loss
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Solution Overview
Problem
Excavation control systems in construction machines face disruptions when position information from satellites is unavailable, leading to increased operator burden as manual intervention is required to resume excavation tasks.
Innovation Solution
A work machine control system that includes a position detection device, a generation unit for creating target excavation ground shape information, and a working unit control unit that maintains excavation control by using previously acquired information when satellite position data is lost, ensuring continuous operation by limiting velocity and storing relevant data for a predetermined time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If excavation control relies on real-time satellite position data, then excavation precision is improved, but system reliability deteriorates when satellite signals are unavailable
Solution Approach 1:
The system performs preliminary actions by storing target excavation ground shape information and position information in advance before satellite signals become unavailable. When signals are lost, the control unit continues excavation control using this pre-stored data, ensuring continuous operation without requiring immediate manual intervention.
Solution Approach 2:
The control unit acts as an intermediary between the satellite position data and the excavation control system. It buffers and stores position information and target excavation ground shape information, providing a transitional mechanism that allows the system to maintain control during satellite signal outages without complete disruption.
2Measurement precision
If excavation control stops when position data is lost, then measurement precision is maintained, but productivity deteriorates due to operator intervention requirements
Solution Approach 1:
The system ensures continuity of useful action by automatically continuing excavation control using stored target excavation ground shape information when satellite position data becomes unavailable. This eliminates interruptions and maintains productive operation without requiring operator intervention to resume work after signal loss.
Solution Approach 2:
The control system provides self-service by automatically detecting satellite signal availability and switching between real-time data and stored information. The system manages its own operation continuity without external operator assistance, automatically resuming excavation control when signals are restored after a predetermined time period.
3Reliability
If the system stores target excavation ground shape information for extended periods, then reliability is improved during signal loss, but information accuracy deteriorates over time
Solution Approach 1:
The system dynamically adjusts its operation mode based on satellite signal availability. It transitions between using real-time satellite position data and stored target excavation ground shape information, with the control unit automatically switching modes to maintain both reliability and accuracy appropriate to current conditions.
Solution Approach 2:
The system implements feedback by continuously monitoring satellite signal availability and automatically switching between data sources. When signals are restored after a predetermined time period, the system receives feedback and transitions back to using real-time satellite data, ensuring information accuracy is maintained when possible.
Data Source
AI summary
A control method controlling a work machine including a working unit with a working tool, comprising: obtaining a position of the working unit based on a detected position information item of the work machine and generating a target excavation ground shape information item indicating a target shape of an excavation target of the working unit from an information item of a design face indicating the target shape; and performing an excavation control of restraining the working unit from performing an excavation beyond the target shape based on the target excavation ground shape information item and, when the target excavation ground shape information item is not able to be acquired during the excavation control, continuing the excavation control by storing the target excavation ground shape information item obtained before a time point at which the target excavation ground shape information item is not able to be acquired, for a predetermined time.