Position Encoder Signal Calibration for Precision Error Correction
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Solution Overview
Problem
Existing devices for determining position, length, or angle, such as encoders, suffer from inaccuracies due to systematic and random errors, sensor variations, and aging-related changes, which affect the precision of position determination.
Innovation Solution
Incorporating a correction unit that influences measurement signals during a calibration run to generate a correction table or function, compensating for deviations from an ideal curve, and applying this correction during normal operation to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction is applied to measurement signals, then position determination precision is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by performing calibration runs before normal operation to generate correction tables and functions. These corrections are pre-calculated and stored, then applied during normal measurement operations. This approach improves precision without adding complex real-time correction mechanisms, as the complex calibration work is done beforehand.
Solution Approach 2:
The patent changes parameters by introducing correction tables and correction functions that modify measurement signals based on pre-determined calibration data. Instead of fundamentally redesigning the measurement system, it adjusts the signal parameters using correction factors derived from calibration runs, thereby improving precision with minimal structural changes.
2Measurement precision
If calibration run is performed to generate correction data, then measurement accuracy is improved, but loss of time occurs
Solution Approach 1:
The calibration process is performed as a preliminary action before normal operation begins. The correction tables and functions are generated once during calibration runs, and then reused during normal measurement operations. This concentrates the time investment in a single setup phase rather than requiring continuous calibration time during operation.
Solution Approach 2:
The patent creates a copy of the ideal measurement behavior through correction tables and functions derived from calibration runs. Instead of repeatedly performing full calibration procedures, the system uses these copied correction data to maintain accuracy during normal operation, significantly reducing the time loss associated with recalibration.
Data Source
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AI summary
The present invention relates to a device, in particular for determining the position, length, or angle between two parts that are movable relative to one another. The claimed device is characterized by a correction unit designed to influence the course of measurement signals used to determine the relative position between the two parts. For this purpose, a calibration signal is generated from output signals of corresponding sensors in a calibration run. The course of this calibration signal is compared with a predetermined reference course. From this, a correction table and/or a correction function is generated. Based on this correction table and/or function, the course of the subsequently generated at least one measurement signal is then influenced in order to correct errors and/or deviations indicated by corresponding deviations.