Bucket Load Weight Calibration Using Unloading Conditions
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Solution Overview
Problem
Existing construction machines face errors in load weight measurement due to factors like type exchanges of working apparatuses, usage accumulation, and temperature changes, leading to increased work time as users need to perform periodic calibration.
Innovation Solution
A method where the construction machine automatically calibrates the load weight measurement system during construction work by determining the bucket unloading condition, calculating a new link parameter using sensor output values, and updating the previous link parameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration is performed periodically to maintain measurement accuracy, then measurement precision is improved, but loss of time increases due to additional calibration work
Solution Approach 1:
The construction machine performs calibration automatically using its own sensors and control system during normal operation. The control unit detects bucket unloading conditions and automatically calculates updated link parameters without requiring external calibration equipment or manual intervention, making the system self-calibrating
Solution Approach 2:
The system performs calibration in advance by detecting bucket unloading conditions that occur naturally during construction work. By using these natural transition points as calibration opportunities, the system prepares updated parameters before they are needed for subsequent measurements, eliminating the need for separate calibration sessions
2Measurement precision
If manual calibration work is required, then measurement precision is maintained, but ease of operation deteriorates due to additional manual tasks
Solution Approach 1:
The control unit automatically detects bucket unloading conditions using sensor data and performs calibration calculations without operator intervention. The system monitors sensor outputs, determines when calibration is needed, executes the calibration algorithm, and updates parameters automatically, transforming a complex manual task into an autonomous self-service function
Solution Approach 2:
The patent replaces manual mechanical calibration operations with an automated electronic control system. Instead of physically adjusting calibration components, the system uses sensors to detect operational states and a control unit to calculate and update link parameters electronically, substituting mechanical manual adjustment with automated electronic control
Data Source
AI summary
In a method of measuring weight of a load in a construction machine, weight of a load loaded in a bucket is measured while performing a construction work using a working apparatus of the construction machine. Whether or not a bucket unloading condition is satisfied is determined at any point in time during the construction work. A link parameter is calculated using output values collected from sensors attached to the construction machine when the bucket unloading is satisfied. A difference between the calculated link parameter (hereinafter, referred to as a new link parameter) and a link parameter that has been used to measure the weight of the load (hereinafter, referred to as a previous link parameter) is compared, to update the previous link parameter with the new link parameter.