Excavator Stability Display and Motion Restriction for Tip Prevention
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Solution Overview
Problem
General-purpose excavators face challenges in controlling unstable states that lead to tipping, particularly due to varying working patterns and environments, which existing technologies are not adequately equipped to handle.
Innovation Solution
An excavator system that includes a controller and sensors to monitor the stability of the machine, providing real-time feedback to the operator through a display screen, and adjusting the movement of the excavator to prevent tipping by restricting movement when instability is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If general-purpose excavators operate in various working patterns and environments, then versatility and adaptability are improved, but stability control and tipping prevention become more difficult
Solution Approach 1:
The excavator implements dynamic stability control by continuously monitoring operating conditions through sensors (accelerometers, gyroscopes, load sensors) and adjusting operational parameters in real-time. The controller dynamically modifies boom movement speed, arm movement speed, and bucket operation based on detected stability conditions, allowing the system to adapt to varying working patterns while maintaining stability control.
Solution Approach 2:
The system employs multiple feedback mechanisms including stability state detection through sensors, real-time monitoring of operating conditions (load weight, ground conditions, weather), and operator feedback via display devices showing stability information and warnings. This closed-loop feedback enables continuous adjustment of operational parameters to maintain stability across diverse working conditions.
2Reliability
If real-time stability monitoring and control systems are added to excavators, then stability control is improved, but device complexity increases
Solution Approach 1:
The control system integrates multiple functions into a single comprehensive stability control apparatus that combines stability state detection, operating condition monitoring, and operational parameter adjustment. The controller serves multiple purposes: detecting stability through sensor data, analyzing operating conditions, determining appropriate control actions, and executing adjustments to boom, arm, and bucket operations, thereby reducing overall system complexity through functional integration.
Solution Approach 2:
The stability control system operates autonomously by automatically detecting stability conditions through sensors, determining appropriate control actions, and adjusting operational parameters without requiring constant operator intervention. The system self-regulates by processing sensor data and automatically modifying boom movement speed, arm movement speed, and bucket operation based on detected stability states, reducing the complexity burden on the operator.
3Reliability
If movement restrictions are imposed to prevent tipping, then stability is improved, but productivity decreases
Solution Approach 1:
The system applies movement restrictions selectively rather than universally. When stability issues are detected, the controller imposes restrictions only on specific operations (boom movement, arm movement, or bucket operation) and only to the extent necessary to prevent tipping. The control apparatus adjusts the degree of restriction based on the severity of the stability condition, allowing partial operation continuation when safe, thereby minimizing productivity impact while maintaining tipping prevention.
Solution Approach 2:
The stability control system takes preliminary action by detecting potential instability conditions before tipping occurs and preemptively adjusting operational parameters. By monitoring stability state continuously and anticipating dangerous conditions, the system prevents tipping by modifying operations in advance rather than reacting after instability develops, allowing smoother transitions and reducing the need for abrupt movement restrictions that would impact productivity.
Data Source
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AI summary
An excavator or the like that can control an unstable state that leads to tipping or the like in accordance with various work patterns, work environments, etc., is provided. An excavator (the shovel 100) according to an embodiment of the present invention includes the lower traveling structure 1, the upper swing structure 3 swingably mounted on the lower traveling structure 1, the attachment attached to the upper swing structure 3, and the display device 40. The display device 40 is configured to display a first range and a second range lower in stability degree than the first range in the working range of the attachment such that the first range and the second range are distinguishable, in view of at least one of a load at the distal end of the attachment, the tilt state of the shovel 100, and the swing angle of the upper swing structure 3 relative to the lower traveling structure 1.