Work Machine Control for Power Supply Circuit Fault Limiting
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Solution Overview
Problem
Existing work machines do not adequately enhance safety when abnormalities occur in power supply circuits outside the controller.
Innovation Solution
A work machine with a controller that outputs commands to limit the operation of working equipment when an abnormality is detected in the power supply circuit connecting the controller and solenoid valves, including controlling the power source to reduce engine rotation speed and hydraulic pump discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller only monitors abnormalities inside itself, then the control system remains simple, but safety is insufficient when power supply circuit abnormalities occur outside the controller
Solution Approach 1:
The controller monitors voltage signals from the power supply circuit to detect abnormalities. When a voltage threshold is exceeded indicating a power supply fault, the controller activates notification devices and limits machine operation, providing feedback-based safety control without requiring complex additional hardware
Solution Approach 2:
The controller uses its existing processing capabilities to monitor power supply voltage and execute safety protocols. The system leverages the controller's own computational resources to perform abnormality detection and response, avoiding the need for separate dedicated monitoring hardware
2Reliability
If the controller limits operation when power supply abnormalities are detected, then safety is enhanced, but machine productivity decreases
Solution Approach 1:
The controller applies partial action by limiting only specific operations that pose safety risks during power supply abnormalities, rather than completely shutting down the machine. This allows non-critical functions to continue operating while preventing dangerous operations
Solution Approach 2:
The control system dynamically adjusts machine operation based on the detected abnormality level. The controller can modify operational parameters in real-time to maintain safe operation while preserving as much productivity as possible under the abnormal conditions
Data Source
AI summary
A work machine having working equipment includes a power source that outputs a driving force for operating the working equipment, a controller, and a solenoid valve controlled by the controller. When it is determined that an abnormality has occurred in the power supply circuit connecting the controller and the solenoid valve, the controller outputs a command for controlling the power source so as to limit an operation of the working equipment.