Rotational Angle Detector Initialization via Directional Error Averaging
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Solution Overview
Problem
Conventional rotational angle detectors for vehicles suffer from detection errors due to backlash between the drive gear and driven gears, leading to increased computation load and complexity in correcting these errors, especially when considering directional biases.
Innovation Solution
A method and device for initializing a rotational angle detector that calculates and stores correction data by measuring forward and reverse direction errors, allowing for accurate rotational angle determination by averaging these errors and applying them as offset values to detected angles, thereby reducing computation load and error consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction data is generated for each rotational angle to compensate backlash errors, then measurement precision is improved, but device complexity and computation load increase significantly
Solution Approach 1:
The patent performs preliminary actions by measuring backlash errors in forward and reverse directions during an initialization phase, then stores the averaged correction values in a lookup table. This preliminary correction data generation allows the system to avoid complex real-time computations during actual operation, resolving the contradiction between precision and complexity.
Solution Approach 2:
The patent segments the correction process by creating separate correction values for forward and reverse rotational directions, then averaging them to create a unified correction lookup table. This segmentation allows the system to handle directional biases separately while simplifying the overall correction mechanism through pre-computed averaged values.
2Measurement precision
If comprehensive correction data is stored for all rotational angles and directions, then measurement precision is improved, but computation load increases
Solution Approach 1:
The system performs all necessary error measurements and corrections during an initialization phase, pre-computing and storing correction values in a lookup table. During actual operation, the system simply retrieves pre-computed correction values rather than performing complex real-time calculations, significantly improving computation efficiency while maintaining precision.
Solution Approach 2:
The patent measures and stores correction data for specific critical points (forward and reverse directions at 0° rotational angle) rather than requiring comprehensive correction data for all possible rotational angles and directions. This partial measurement approach, combined with the lookup table method, provides sufficient correction accuracy while dramatically reducing computation requirements.
3Measurement precision
If directional bias in backlash errors is considered, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the error correction by separately measuring and correcting for forward and reverse rotational directions. By averaging the correction values from both directions, the system handles directional biases systematically while maintaining a relatively simple correction mechanism through the lookup table approach.
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
This approach minimizes detection errors and simplifies the initialization process by equally allocating error correction across directional rotations, enhancing the accuracy and efficiency of rotational angle detection for vehicle stability systems.
Implementation Method 1
A magnet is arranged on each driven gear to rotate integrally with the driven gear. The rotational angle detector has a controller that determines the rotational angles of the two driven gears with the corresponding magnetic sensors
Data Source
AI summary
A method for initializing a rotational angle detector detecting rotational angles of two driven gears mated with a drive gear, rotated integrally with a detection subject, and obtaining rotational angle of the detection subject from the detected rotational angles. The method includes obtaining a first error and second error in each rotational angle of the driven gears when the drive gear is rotated in forward and rearward directions, obtaining an average value of the first and second errors, obtaining a difference between the average value and a theoretical rotational angle for the two driven gears when the rotational angle of the drive gear is 0°, and storing the difference as correction data added to each actual rotational angle of the two driven gears when obtaining the rotational angle of the detection subject.