Implement Calibration Using Compaction Factor
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Solution Overview
Problem
Conventional implement position control systems face challenges in precise calibration, especially when the machine is not on a flat surface, as they require a flat surface for calibration, which is impractical in field conditions.
Innovation Solution
The system calculates a first elevation value of the implement and a second elevation value of the ground-engaging device, determines if the machine is spreading, and adjusts the second elevation value based on a compaction factor to calculate an adjusted elevation difference, allowing for calibration of the implement actuation sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calibration methods are used on uneven terrain, then calibration cannot be performed accurately, but requiring a flat surface for calibration is impractical in field conditions
Solution Approach 1:
The system changes the calibration approach by introducing a compaction factor that adjusts the relationship between implement elevation and ground-engaging device elevation. Instead of requiring flat terrain conditions, the system modifies the elevation difference calculation by applying a compaction factor (typically 0.02-0.05) when the implement is spreading material, thereby maintaining calibration accuracy across varying terrain conditions.
Solution Approach 2:
The compaction factor acts as an intermediary parameter that mediates between the implement elevation and ground-engaging device elevation measurements. This intermediary allows the system to account for material compaction effects and achieve accurate calibration without requiring the machine to be positioned on a flat surface, thus enabling field calibration.
2Measurement precision
If the machine is spreading material during calibration, then elevation measurements are inaccurate due to compaction, but ignoring compaction leads to calibration errors
Solution Approach 1:
The system introduces a compaction factor parameter that modifies the elevation difference calculation. When the implement is identified as spreading material, the compaction factor (typically 0.02-0.05) is applied to adjust the relationship between implement elevation and ground-engaging device elevation, thereby compensating for compaction effects and maintaining measurement accuracy.
Solution Approach 2:
The system uses feedback from the implement position sensor and material spread detection to determine when the implement is spreading. Based on this feedback, the system automatically applies the compaction factor to the elevation calculation, creating a closed-loop calibration process that adapts to spreading conditions without requiring manual intervention.
Data Source
AI summary
A method, system, and non-transitory computer-readable storage medium for calibrating an implement actuation sensor of a machine are disclosed. The method may include calculating a first elevation value of an implement of the machine. The method may include calculating a second elevation value of a ground-engaging device of the machine. The method may include, in response to determining that the machine is spreading, adjusting the second elevation value based on a compaction factor to determine an adjusted second elevation value. The method may further include determining a first elevation difference value based on a difference between the first elevation value and the adjusted second elevation value. The method may further include calibrating the implement actuation sensor based on the determined difference.