Absolute Angle Detection Using Gray Code and Optical Substitution
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Solution Overview
Problem
Existing absolute angle detecting devices for automobiles face deviations in digital code switching due to mechanical speed reduction mechanisms, leading to incorrect detection of rotating angles, especially with higher speed reduction ratios.
Innovation Solution
The device employs a combination of Gray code strings for angle detection and sector identification, with specific code patterns on multiple rotary disks connected via reduction gear mechanisms, ensuring correct angle detection within a predetermined deviation range and allowing for error checking and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a mechanical speed reduction mechanism (such as a train of gears) is used to expand the detecting angle area, then the rotating angle of the multi-rotation body can be detected over a wider range, but the deviation amount increases due to backlash, leading to incorrect detection
Solution Approach 1:
The patent replaces the mechanical speed reduction mechanism with an optical system. A rotary disk with code patterns rotates directly with the multi-rotation body, and optical detecting elements read the code patterns to determine position. This eliminates mechanical backlash while maintaining the ability to detect over a wide angle range through direct optical coupling.
Solution Approach 2:
The patent uses code patterns (such as Gray code) on the rotary disk that encode position information. The detecting elements read these optical copies of position data rather than relying on mechanical transmission, allowing accurate angle detection without mechanical error accumulation.
2Adaptability or versatility
If the speed reduction ratio is increased to expand the detecting angle area, then the rotation range can be covered, but the deviation amount α becomes larger, causing incorrect sector identification
Solution Approach 1:
The patent eliminates the mechanical speed reduction mechanism entirely, using a rotary disk that rotates directly with the multi-rotation body. Optical detecting elements read code patterns on the disk to determine both sector and angle information, achieving wide rotation range coverage without the reliability issues of mechanical transmission.
Solution Approach 2:
The patent uses multiple code pattern rows on the rotary disk, including a first code pattern row for sector identification and a second code pattern row for angle detection. This multi-dimensional coding approach allows simultaneous determination of sector and precise angle without mechanical reduction.
Data Source
AI summary
An absolute angle detecting device is provided. The absolute angle detecting device is composed of a first detecting element group that outputs a Gray code string for angle detection that detects a rotating angle in one sector of the multi-rotation body at required resolution, a second detecting element group and a third detecting element group that outputs a first and a second Gray code strings for sector identification. A rotating angle within one rotation (360 degrees) is detected by the Gray code for angle detection while setting one rotation of the multi-rotation body to one sector.