Construction Machine Load Measurement Validation via Wheel Speed Differential
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Solution Overview
Problem
Existing load measuring apparatuses for construction machines, such as dump trucks, face challenges in accurately measuring loads when traveling on curvilinear routes due to loss of left-right balance and the inability to differentiate between rectilinear and curvilinear movements, leading to inaccurate weight measurements.
Innovation Solution
A load measuring apparatus that includes processing units for acquiring cylinder pressure signals, rear-wheel speed detectors, a speed difference detector, and a final loading-weight confirmation unit that outputs the computed loading weight only when specific conditions are met, such as stable vehicle chassis speed, minimal loading weight fluctuation, and low rear-wheel differential speed, ensuring accurate measurements by making the weight value ineffective during curvilinear travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If load measurement is performed during normal loaded-traveling conditions, then measurement timing is improved and data management results are better, but measurement accuracy deteriorates when traveling on curvilinear routes due to loss of left-right balance
Solution Approach 1:
The patent changes the parameter used for measurement validation by comparing rear-wheel speed differences between left and right wheels. When the speed difference exceeds a threshold, the system identifies curvilinear travel and invalidates the measurement, thus maintaining accuracy while allowing measurements during normal travel conditions
Solution Approach 2:
The system continuously monitors rear-wheel speed differences and uses this feedback to determine whether to accept or invalidate load measurements. This feedback mechanism enables real-time quality control of measurement data based on vehicle travel conditions
2Speed
If the construction machine travels on a curvilinear route, then mobility is maintained, but load measurement becomes inaccurate due to loss of left-right balance
Solution Approach 1:
The patent introduces a new parameter - rear-wheel speed difference - as a criterion for validating load measurements. By monitoring this parameter, the system can distinguish between rectilinear and curvilinear travel, accepting measurements only when the speed difference is within acceptable thresholds, thus maintaining measurement accuracy while preserving vehicle mobility
3Reliability
If load measurement is performed during reverse travel for unloading, then measurement conditions are improved by avoiding impacts, but measurement timing is delayed and curvilinear route issues still occur
Solution Approach 1:
The patent changes from requiring specific travel phases (reverse travel) for measurement to using continuous monitoring with validation based on rear-wheel speed differences. This allows measurements to be taken during any travel phase including forward loaded travel, as long as the validation parameters are satisfied, thus improving timing while maintaining reliability
Data Source
AI summary
A load measuring device for a construction machine includes a processing unit for acquiring signals indicative of cylinder pressure of front and rear suspension cylinders via pressure sensors and computing a weight value of a load put on a dump body of the construction machine. When the construction machine is traveling on a curvilinear route, the construction machine makes the output of the weight value ineffective. In particular, when the differential speed value between the rear wheels, received from a speed difference detector, is below a preset value, the arithmetic unit outputs a loading weight W computed by the processing unit, as final loading weight, and so that when the differential speed exceeds the preset value, the arithmetic unit makes ineffective the computed loading weight W as the final loading weight output.