Rotation Angle Detection Device Extended Domain Correction
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Solution Overview
Problem
Existing rotation angle detection devices face challenges in accurately correcting the rotation angle of driven gears beyond 360 degrees, leading to reduced detection precision due to electrical and mechanical errors, as they rely on correction angles calculated within a 0 to 360-degree domain without considering deviations in extended angle domains.
Innovation Solution
A rotation angle detection device that includes a correction-object driven gear with a sensor and an electronic control unit, which computes and corrects the driven-side rotation angle by averaging deviations over multiple rotations, considering both 0 to 360-degree and extended angle domains to provide more accurate corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If correction angle is stored based on 0 to 360 degree domain only, then device complexity is reduced, but measurement precision deteriorates in extended angle domains
Solution Approach 1:
The correction angle data is segmented by angle domain (0-360 degrees vs. extended domains). The system stores first correction angles for the basic 0-360 degree domain and second correction angles for extended domains exceeding 360 degrees. This segmentation allows the system to maintain simple storage for basic operations while providing high-precision correction for extended rotations, resolving the contradiction between device complexity and measurement precision.
2Measurement precision
If correction angle is averaged over multiple rotations, then measurement precision is improved, but loss of time increases due to data collection period
Solution Approach 1:
The system performs preliminary averaging of correction angles during an initial data collection period, storing the averaged values in memory. Once the averaged correction angles are stored, no additional data collection time is required during normal operation. This preliminary action resolves the contradiction by front-loading the time investment, allowing fast real-time correction without ongoing time loss.
3Measurement precision
If correction angle is updated frequently, then measurement precision is maintained, but device complexity increases due to update management
Solution Approach 1:
The system implements periodic updating of correction angles at predetermined intervals rather than continuous updates. The electronic control unit determines whether to update correction angles based on elapsed time or rotation count thresholds. This periodic approach maintains measurement precision by regularly refreshing correction data while reducing device complexity by eliminating the need for continuous update monitoring and management.
Data Source
AI summary
A rotation angle detection device includes a correction-object driven gear that is a driven gear meshing with a main driving gear, a first sensor that is configured to generate an electrical signal based on rotation of the correction-object driven gear, and an electronic control unit that computes a driven-side rotation angle based on the electrical signal. The electronic control unit is configured to store a correction angle used to correct the driven-side rotation angle when computing the driven-side rotation angle. The correction angle is a predetermined deviation in a predetermined angle domain obtained as an average value in which deviations of the number equal to the integer and corresponding to a same relative rotation angle is averaged, so as to be deviation in an angle domain of 0 to 360 degrees.