Hall Sensor Position Detection Without Signal Linearization
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Solution Overview
Problem
Existing position determination methods using Hall sensors in position measuring systems are hindered by the need for linearization of measurement signals, limited measurement ranges, and sensitivity to ambient influences like temperature and aging, leading to inaccurate and complex calculations.
Innovation Solution
A method involving a position detection device with one or multiple Hall sensors that measures signals in different directions, using pre-determined position intensity data to directly determine the position of a signal generator without linearization, incorporating ambient and aging factors, and utilizing artificial intelligence for precise position estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If linearization methods (sigmoid function, arctangent function) are applied to Hall sensor measurement signals, then measurement precision is improved, but device complexity and calculation time increase
Solution Approach 1:
The patent pre-calculates and stores position intensity data for multiple predetermined positions during system setup or calibration. This lookup table approach eliminates the need for complex real-time linearization calculations, reducing computational complexity while maintaining measurement precision through direct comparison of current signals with stored reference data
Solution Approach 2:
The patent creates a digital copy of the magnetic field intensity characteristics at predetermined positions and stores this data for reference. Instead of performing complex mathematical transformations on measurement signals, the system compares current signals against these stored copies, simplifying the evaluation process while preserving accuracy
2Length of stationary object
If multiple Hall sensors are arranged successively to extend measurement range, then measurement range is improved, but device complexity and sensor quantity increase
Solution Approach 1:
The patent enables a single Hall sensor to perform multiple measurement tasks by utilizing position intensity data from multiple predetermined positions. The same sensor can determine positions across an extended range by comparing signals against the comprehensive lookup table, eliminating the need for multiple physically arranged sensors
Solution Approach 2:
The patent extends the measurement capability from spatial arrangement of multiple sensors to the dimensional expansion of stored position intensity data. By organizing reference data for multiple predetermined positions in a lookup structure, the system achieves extended measurement range through data dimensionality rather than physical sensor multiplication
3Reliability
If Hall sensors are used for contact-free measurement, then reliability is improved, but measurement precision deteriorates due to ambient influences and aging
Solution Approach 1:
The patent incorporates ambient temperature detection and uses this feedback to select appropriate position intensity data from the lookup table that corresponds to the detected temperature conditions. This temperature-compensated approach maintains measurement precision despite ambient thermal influences on the Hall sensor characteristics
Solution Approach 2:
The patent accounts for aging and environmental effects by pre-calculating position intensity data under various conditions and storing multiple sets of reference data. The system adapts to changing sensor characteristics over time by selecting the most appropriate reference data set, maintaining precision despite parameter drift
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
Enables fast and accurate position determination with reduced sensor requirements, expanded measurement range, and robustness against environmental variations, enhancing precision and efficiency.
Implementation Method 1
Hall sensors are often used for determining a position. These measure a magnetic field of a signal generator that is moved past them.
Data Source
AI summary
A method for detecting a position of a signal generator in a position measuring system which includes exactly one single Hall sensor with at least two subsensors, a set of position intensity data being provided for a plurality of predetermined positions. A current measurement signal is detected for each measuring direction at the singular Hall sensor for a current position of the signal generator, and the current position of the signal generator is determined from the position intensity data and all current measurement signals. The position intensity data for the position measuring system may be stored in a control unit.