Wheel Loader Payload Measurement Angular Acceleration Compensation
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Solution Overview
Problem
Existing payload measurement systems for machines, such as wheel loaders, face inaccuracies in determining the weight of materials due to factors like friction and acceleration, which can lead to inefficiencies and increased costs from overloading or underloading transport vehicles.
Innovation Solution
A payload measurement system that includes a lift arm with a lift cylinder actuator, sensors for lift arm angle and pressure, and a controller to calculate a compensation factor for angular acceleration, allowing for accurate weight determination by adjusting the pressure differential based on lift arm angular acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If payload measurement is performed while the machine and work implement are in motion, then productivity is improved, but measurement precision deteriorates due to acceleration effects
Solution Approach 1:
The system dynamically adjusts measurement parameters by detecting acceleration and applying compensation factors to the pressure readings. The controller modifies the weight calculation based on detected acceleration parameters, allowing accurate measurements during motion by changing the computational parameters rather than requiring static conditions
Solution Approach 2:
The system uses feedback from acceleration detection to continuously adjust the weight measurement calculation. By monitoring the acceleration state and feeding this information back into the measurement algorithm with appropriate compensation factors, the system maintains measurement precision during dynamic operation
2Measurement precision
If acceleration compensation is applied to improve measurement precision, then device complexity increases
Solution Approach 1:
The system replaces complex mechanical measurement systems with electronic sensors and computational algorithms. Instead of using complex mechanical mechanisms to eliminate acceleration effects, the patent uses electronic pressure sensors combined with microprocessor-based compensation calculations to achieve the same goal with simpler overall system architecture
Solution Approach 2:
The controller acts as an intermediary between the pressure sensor and the final weight measurement. It introduces compensation factors as an intermediate computational step that corrects acceleration effects without requiring direct mechanical intervention in the measurement process
Data Source
AI summary
A payload weight of a load of material carried by an implement of a machine may be estimated taking into account angular acceleration of the payload. A lift cylinder pressure differential and a lift arm angular acceleration may be determined as the implement is raised through a weigh range. An angular acceleration compensation factor may be determined from the lift arm angular acceleration, and a compensated differential pressure may be calculated by multiplying the lift cylinder pressure differential by the angular acceleration compensation factor. The estimated payload weight may then be determined based on the compensated pressure differential and a head end cross-sectional area of the lift cylinder.