Rotation Detector Abnormality Estimation for Steering Systems
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Solution Overview
Problem
Existing rotation detection devices face challenges in maintaining the calculation of rotation information when abnormalities occur in the number of rotations detected, which can lead to disruptions in controlling drive targets, potentially causing vehicle control systems to stop.
Innovation Solution
The implementation of a rotation detection device that continues to calculate rotation information by using an estimation of the rotation number based on the rotation angle, even when an abnormality is detected, and outputs this calculated information to prevent disruptions in the control of motors, thereby ensuring continuous vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the calculation of rotation information is stopped when an abnormality in the number of rotations is detected, then the reliability of rotation information is improved, but the productivity of the control system deteriorates
Solution Approach 1:
The patent introduces an estimation value as an intermediary to bridge the gap between abnormal detection data and the control system. When the number of rotations is detected as abnormal, the system calculates an estimation value based on the rotation angle and other available data, using this estimation as a mediator to maintain control system operation without directly using the abnormal detection value
Solution Approach 2:
The system dynamically changes the parameter used for control based on the validity of detection data. When the number of rotations is normal, it uses the detected rotation information; when abnormal, it switches to using an estimation value derived from rotation angle and other parameters, thus adapting the input parameter to maintain system productivity
2Productivity
If the calculation of rotation information continues when an abnormality in the number of rotations is detected, then the productivity of the control system is improved, but the reliability of rotation information deteriorates
Solution Approach 1:
The patent extracts only the valid components from the detection data for calculation. When the number of rotations is abnormal, the system excludes this unreliable parameter from the rotation information calculation and instead uses only the rotation angle and other reliable parameters to generate the estimation value, thus maintaining reliability while continuing operation
Solution Approach 2:
The system creates a copy or alternative representation of the rotation information through estimation. Instead of directly using the abnormal detection value, it generates an estimation value that copies the essential functional information needed for control while being derived from reliable parameters, thus maintaining both productivity and reliability
Data Source
AI summary
A rotation detector has a first controller that monitors abnormality of a rotation number calculated by a rotation number calculator based on the calculated rotation number and a preset rotation angle. The first controller in a first system is configured to output rotation information calculated by a second controller in a second system upon having determination that the rotation number of the first system has abnormality, for a continuation of the rotation information calculation.