Articulated Machine Control Delaying Activation for Safe Alignment
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Solution Overview
Problem
Articulated machines like motor graders face issues with automatic articulation control being disengaged at high speeds, leading to undesirable articulated positions and sudden changes in articulation angle when reactivated, which can cause safety hazards and operator distraction.
Innovation Solution
A method that uses an electronic controller to identify incompatible operating conditions, prevent automatic articulation control from starting, and allow limited operation to correct undesired articulation angles before disabling it, ensuring safe and efficient operation by activating the automatic articulation control only when conditions are compatible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic articulation systems are used to improve efficiency and reduce manual labor, then productivity increases, but the risk of catastrophic failure increases due to lack of human oversight
Solution Approach 1:
The system continuously monitors articulation parameters (position, velocity, acceleration, torque) and compares them against predefined safe operating envelopes. When parameters approach unsafe thresholds, the system automatically provides feedback to reduce power or shut down, preventing catastrophic failures while maintaining automated operation
Solution Approach 2:
The control system proactively identifies and prevents unsafe articulation conditions before they can cause damage. By establishing predetermined safe operating limits and monitoring for approach to these limits, the system takes preliminary action to prevent catastrophic failure modes before they occur
2Adaptability or versatility
If complex articulation movements are performed to increase operational capability, then versatility improves, but the likelihood of entering unsafe articulation zones increases
Solution Approach 1:
The system applies different safety monitoring strategies to different articulation joints and movement types. Each joint has its own predetermined safe operating envelope tailored to its specific mechanical constraints, allowing complex versatile movements while maintaining appropriate safety boundaries for each local component
Solution Approach 2:
The safe operating envelopes are dynamically adjusted based on real-time articulation state, load conditions, and joint position. This allows the system to permit more aggressive movements when safe while preventing entry into unsafe zones, enabling versatility without compromising safety
3Power
If power is increased to improve articulation speed and force, then productivity increases, but the potential damage from unsafe articulation conditions increases
Solution Approach 1:
The system prepares safety mechanisms in advance by pre-programming safe operating envelopes and shutdown procedures for each articulation joint. Before unsafe conditions can cause damage, the system has already established protective boundaries and response protocols, cushioning against potential harm from high-power articulation movements
Data Source
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AI summary
Activation of an automatic articulation control function in an articulated machine (10) is delayed until error conditions are cleared or a steering angle to alignment angle mismatch is corrected. A controller (102) monitors a selector (110) setting indicating a desire to activate the automatic articulation control function. The controller (102) also evaluates whether conditions such as low ground speed, loss of signal from needed sensors, or articulation misalignment are present. If so, the conditions are monitored and when corrected, the automatic articulation control function is activated. An indicator (204, 206) may be set to inform an operator that the automatic articulation control function is pending activation.