Position Sensor Calibration for Drift in Mobile Working Machines
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Solution Overview
Problem
Current methods for calibrating location/position sensors on mobile working machines require high application effort and time, especially during online calibration, and are prone to inaccuracies due to sensor slippage and aging effects.
Innovation Solution
A method that selects multiple positions on the equipment component, determines the distance between these positions, and calculates calibration parameters from sensor signals to compensate for sensor changes and aging effects, allowing for precise online calibration without additional sensors or complex factory calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position sensors are calibrated using external reference signals (GPS, spirit level) offline, then calibration accuracy can be achieved, but significant application effort and time are required
Solution Approach 1:
The system performs self-calibration using its own position sensor readings at multiple equipment positions. The calibration parameters are determined automatically by comparing sensor signals with predetermined distances between positions, eliminating the need for external reference signals and manual calibration procedures.
Solution Approach 2:
The system pre-determines the distances between multiple equipment positions before calibration. This preliminary action enables the calibration process to proceed automatically by comparing predetermined distances with actual sensor measurements, reducing both time and effort required.
2Loss of time
If position sensors are calibrated online during commissioning and operation, then application effort and time are reduced, but calibration accuracy and reliability are compromised due to sensor slippage and aging effects
Solution Approach 1:
The system performs periodic calibration at multiple equipment positions during normal operation. By repeatedly measuring positions and updating calibration parameters, the system maintains accuracy over time and compensates for sensor drift and aging effects that occur during continuous use.
Solution Approach 2:
The system uses feedback from position sensor readings at multiple positions to continuously refine calibration parameters. The measured positions are compared with predetermined distances, and calibration parameters are adjusted based on the differences, ensuring ongoing accuracy despite sensor degradation.
3Device complexity
If position sensors are calibrated at a single reference position, then the calibration process is simple, but it cannot compensate for changes in sensor position, pulley slippage, or aging effects
Solution Approach 1:
The calibration process is divided into multiple measurement segments at different equipment positions. Instead of a single reference point, the system collects position data from multiple segments (positions), each contributing to the overall calibration parameter determination, thereby improving accuracy while maintaining manageable complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces commissioning time, eliminates installation inaccuracies, and automatically corrects for sensor drift and aging, enhancing the reliability and precision of sensor calibration throughout the equipment's service life.
Implementation Method 1
a position sensor with which the position of a component of the equipment of a mobile working machine can be detected
Data Source
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AI summary
The invention relates to a method for calibrating a position sensor with which the position of a component of the equipment of a mobile working machine can be detected, comprising the following method steps: - selection of at least two positions of the equipment component and predetermination of the distance between the at least two positions; - detection of the at least two positions of the equipment component independently of the position sensor; - determination of calibration parameters for the position sensor from the signals emitted by the position sensor in the at least two positions of the equipment component and the predetermined distance between the at least two positions.