Hydraulic Excavator Control for Communication Fault Operation Limits
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Solution Overview
Problem
Existing control systems for work machines excessively limit operations due to communication faults, leading to unnecessary decreases in work efficiency when the work machine is performing normal functions or autonomous operations.
Innovation Solution
A work machine equipped with a controller that differentiates between cooperative and non-cooperative work scenarios, applying stronger operation limitations during cooperative work to minimize excessive stopping or deceleration, thereby maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the work machine stops or decelerates in response to communication faults, then safety is improved, but work efficiency deteriorates due to excessive control
Solution Approach 1:
The control system dynamically adjusts the degree of operation limitation based on the work mode. When autonomous work is detected, the system applies stronger limitation (stop or decelerate), whereas during manual operation with normal work functions, it applies weaker limitation, allowing continued operation. This dynamic adjustment resolves the contradiction by adapting the safety response to the actual operational context.
Solution Approach 2:
The system changes the control parameter (degree of operation limitation) based on the detected work mode. By identifying whether the work machine is performing autonomous work or manual operation, the controller adjusts the limitation level accordingly, allowing work to continue during manual operation while stopping during autonomous work, thus balancing safety and efficiency.
2Reliability
If operation limitation is applied during communication faults, then contact prevention is improved, but work continuity deteriorates due to unnecessary stopping
Solution Approach 1:
The system dynamically determines whether to limit operation based on the work mode detected during communication faults. When autonomous work is detected, operation is limited to prevent contact; when manual operation with normal functions is detected, operation continues. This dynamic decision-making maintains work continuity during non-critical faults while ensuring contact prevention when necessary.
Solution Approach 2:
The control response is differentiated based on the local condition of the work mode. Instead of applying uniform limitation across all communication faults, the system applies different levels of limitation depending on whether autonomous work or manual operation is detected, allowing work continuity in safe conditions while ensuring contact prevention when needed.
Data Source
AI summary
A hydraulic excavator for performing cooperative work with another hydraulic excavator or a worker includes: a driving device that makes the hydraulic excavator operate; a cooperative function device that shares information about the hydraulic excavator with an inside and an outside of the hydraulic excavator; and a controller that controls the driving device that makes the hydraulic excavator operate, the controller, when there is an abnormality in the cooperative function device, controlling the driving device so as to limit operation of the hydraulic excavator, and when the hydraulic excavator is performing the cooperative work, controlling the driving device so as to make a degree of limitation on the operation of the hydraulic excavator stronger than when the hydraulic excavator is not performing the cooperative work. It is thereby possible to suppress an unnecessary decrease in work efficiency by suppressing an excessive operation limitation on the hydraulic excavator.