Work Machinery Load Measuring System Posture Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional load measuring devices for work machines with front work implements face challenges in accurately detecting measuring accuracy variations due to posture changes and operation velocities, leading to decreased measurement precision and increased maintenance needs.
Innovation Solution
A load measuring system that includes posture information sensors and a controller capable of adjusting load thresholds based on the work arm tip position and operation velocity, enabling more accurate detection of measuring accuracy deterioration and prompting recalibration when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a load measuring device is continuously used after sensor deterioration, then work continuity is maintained, but measurement accuracy deteriorates
Solution Approach 1:
The system continuously monitors measurement values and compares them against threshold ranges to detect sensor deterioration. When the measurement value falls outside the acceptable range, the system automatically triggers recalibration, creating a closed-loop feedback mechanism that maintains measurement accuracy while allowing continuous operation.
Solution Approach 2:
The system performs preliminary detection of measurement degradation by monitoring whether measurement values remain within predetermined threshold ranges. This early detection allows for timely recalibration before the deterioration significantly impacts work efficiency, preventing accuracy loss while maintaining continuous operation.
2Measurement precision
If frequent recalibration is performed, then measurement accuracy is maintained, but maintenance time and expenses increase
Solution Approach 1:
The system uses feedback from continuous monitoring of measurement values to determine when recalibration is actually needed. By comparing measurement values against dynamic threshold ranges that account for sensor characteristics and operating conditions, the system performs recalibration only when necessary, avoiding unnecessary maintenance while ensuring accuracy.
Solution Approach 2:
The system dynamically adjusts recalibration timing based on real-time measurement analysis rather than using fixed schedules. The threshold ranges are adapted to current operating conditions and sensor performance, allowing the system to extend maintenance intervals when measurement accuracy remains acceptable and reduce them only when deterioration is detected.
3Measurement precision
If conventional load measuring technology is applied to front work implement machines, then measurement capability is provided, but measurement accuracy varies with posture and operation
Solution Approach 1:
The system dynamically adjusts measurement thresholds and calibration parameters based on the current posture and operating conditions of the front work implement. By making the measurement evaluation adaptive to changing mechanical configurations, the system maintains measurement accuracy across diverse operating positions rather than relying on fixed calibration values.
Solution Approach 2:
The system changes measurement parameters such as threshold ranges and calibration factors according to detected operating conditions including posture, operation velocity, and load position. This parameter adaptation compensates for the varying mechanical characteristics at different positions, ensuring consistent measurement accuracy across the full range of operational flexibility.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A load value W, which is a weight of a transportation target carried by a front work implement 12, is calculated based on a work load of a boom cylinder 16 of the front work implement 12, and on posture information which is information associated with a posture of the front work implement 12. A load threshold T used for determining whether to recalibrate a load measuring system is changed in accordance with a posture index value which is an index associated with the posture of the front work implement 12 and is obtained based on the posture information. Whether to recalibrate the load measuring system is determined based on the load value W and the load threshold T. A determination result is displayed on a display screen 30 to notify an operator of the determination result. In this manner, deterioration of measuring accuracy is more appropriately detectable regardless of variations of a posture of a front work implement of a work machine.