Position Sensor Evaluation Unit Multi-Table Correction
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Solution Overview
Problem
Conventional devices for determining relative position, length, or angle suffer from systematic errors due to various factors, limiting their accuracy despite the use of correction tables.
Innovation Solution
The evaluation unit has access to multiple correction tables, each containing different correction values for sensors, allowing for comprehensive correction of various error sources, and enabling a more precise determination of relative position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single correction value is used for each sensor, then the device complexity is reduced, but the measurement precision deteriorates due to inability to account for multiple error sources
Solution Approach 1:
The correction table is segmented into multiple correction values for each sensor, where each correction value corresponds to a specific error source or operating condition. This segmentation allows the system to address multiple error sources independently rather than using a single aggregated correction value, thereby improving measurement precision while maintaining manageable complexity through structured organization.
Solution Approach 2:
Different correction values are applied locally to each sensor based on specific error sources or operating conditions. Each sensor receives tailored correction values that address its particular characteristics and error patterns, rather than applying a uniform correction across all sensors. This local quality approach enhances the precision of relative position determination by accounting for sensor-specific variations.
2Measurement precision
If multiple correction values are assigned to each sensor, then the measurement precision is improved, but the device complexity increases due to managing multiple correction tables
Solution Approach 1:
The correction table structure is designed to be universal and multi-functional, where a single correction table can serve multiple purposes by containing correction values for different error sources and operating conditions. This universal structure allows the system to handle various correction scenarios without requiring separate management mechanisms for each correction type, thereby reducing the overall complexity despite the presence of multiple correction values.
Solution Approach 2:
Multiple correction values are pre-calculated and stored in the correction table before actual measurement operations. This preliminary action allows the system to have all necessary correction data readily available, eliminating the need for complex real-time calculations during measurement. The pre-organized correction values simplify the measurement process and reduce operational complexity.
3Measurement precision
If comprehensive correction values are applied, then the measurement precision is enhanced, but the calculation time increases due to processing multiple correction values
Solution Approach 1:
Correction values are pre-calculated and stored in the correction table during system setup or calibration phases. This preliminary action eliminates the need for complex real-time calculations during actual measurements. When performing relative position determination, the system simply retrieves and applies the pre-computed correction values, significantly reducing calculation time while maintaining high measurement precision.
Solution Approach 2:
The correction calculation process is extracted from the real-time measurement process. Correction values are computed separately in advance and stored for later use. This extraction separates the computationally intensive correction calculation from the time-sensitive measurement operation, allowing the system to achieve both high precision and fast response times by performing corrections offline or during idle periods.
Data Source
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AI summary
A device for determining position, length, or angle, comprising a first (14) and a second part (18) which are movable relative to one another. A coding (12) comprising a plurality of consecutive code sections (22-0 to 22-9) of the first type and of the second type is attached to the first part. A readout device (16) for detecting the coding is attached to the second part, wherein the readout device comprises a plurality of sensors (20-1 to 20-8), each of which is designed to detect the code sections and output a corresponding measured value. The device further comprises an evaluation unit (24) which is designed to identify transitions between contiguous regions of code sections of the first type and contiguous regions of code sections of the second type based on said measured values, and to determine a relative position between the first and second parts based on these transitions.The evaluation unit has access to at least one correction table in which at least two different correction values are assigned to each of the sensors of the readout device. The evaluation unit is configured to consider at least some of these correction values when determining the relative position between the first and second parts. Furthermore, a corresponding method for determining position, length, or angle is described.