Angular Measuring System Correction Factor Calculation
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Solution Overview
Problem
Existing angular measurement systems face inaccuracies due to 'gain mismatch' during calibration, particularly when it's impossible to rotate and position the axle by full 360° or >180°, leading to increased calibration time and reduced accuracy with fewer measuring points.
Innovation Solution
A method and apparatus for calculating a correction factor by measuring output values at two positions, forming an actual value from their difference, and a target value from target values at those positions, allowing for precise calculation of the correction factor even with an angular difference of less than 50°, using a sensor like a Hall sensor and a computing unit to apply this correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement over a full revolution (360°) is performed to calculate correction factor, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies partial action by measuring only at two specific positions (0° and 90°) rather than performing a full 360° revolution measurement. This partial measurement approach is sufficient to calculate the correction factor for gain mismatch, thereby reducing calibration time while maintaining adequate measurement precision.
2Loss of time
If number of measuring points is reduced to limit calibration time, then loss of time is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent measures only at two critical positions (0° and 90°) rather than using multiple measuring points across the full rotation. This minimal set of measurements is specifically chosen to calculate the correction factor without requiring extensive measurement campaigns, thus reducing time while preserving sufficient precision for the correction calculation.
3Ease of operation
If measurement is performed over angular range less than 180°, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent requires measurement over only 90° (from 0° to 90° positions) instead of the conventional >180° range. This reduced angular range simplifies the calibration operation by limiting the mechanical rotation required while still providing sufficient data to calculate the correction factor accurately.
4Device complexity
If gain mismatch is not corrected, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent changes the parameter of measurement scope from full 360° revolution to just two positions (0° and 90°). This parameter change simplifies the calibration process while enabling correction factor calculation. The correction factor itself is a parameter that compensates for gain mismatch, improving measurement precision without adding complex hardware.
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 accurate calculation of the correction factor, improving the precision of amplitude correction for angular measurements, reducing calibration time and inaccuracy, and applicable in various applications like accelerator pedals and brakes.
Implementation Method 1
In one embodiment, the sensor is a Hall sensor
Data Source
AI summary
A method for computing a correction factor (KF) for an angular measuring system (10) comprising a measurement of a first output value (W1) in a first measuring position (20) and a measurement of a second output value (W2) in a second measuring position (30). An actual value (DI) is formed from the difference between the first output value (W1) and the second output value (W2), and a target value (DS) is formed from the difference of target values (S1, S2) in the first measuring position (20) and in the second measuring position (30). The correction factor (KF) is computed from the ratio of the target value (DS) to the actual value (DI).