Rotation Detection Device With Three Detectors For Failure Diagnosis
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Solution Overview
Problem
Existing rotation detecting devices with two detection sensors cannot determine if the operation part is rotating correctly or if a failure has occurred, especially when one sensor fails, as they rely on patterns of light-receiving signals which are ambiguous in such scenarios.
Innovation Solution
A rotation detecting device with a first, second, and third detector, each outputting a rotation detection signal with specific phase differences, and a controller to analyze these signals to determine the rotation state and detect failures in any of the detectors, ensuring accurate detection of rotation direction and amount, and identifying sensor failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two detection sensors are used to detect rotation direction and amount, then the device complexity is reduced, but the reliability of failure detection deteriorates
Solution Approach 1:
The patent assigns different functional roles to different detectors: the first and second detectors work together for normal rotation detection, while the third detector serves as a dedicated failure detection sensor. This local differentiation of function allows the system to maintain simplicity while improving reliability through specialized failure detection capability.
Solution Approach 2:
The system performs preliminary failure detection by continuously monitoring the relationship between signals from multiple detectors before actual failure occurs. The controller checks whether signal patterns match expected rotation patterns, enabling early detection of sensor failures before they affect rotation detection accuracy.
2Device complexity
If two detection sensors are used to detect rotation, then the device complexity is reduced, but the measurement precision of rotation state deteriorates
Solution Approach 1:
The system uses feedback from multiple detectors to verify rotation state measurements. The controller compares signals from the first, second, and third detectors to determine if they are consistent with each other and with the expected rotation pattern, thereby improving measurement precision through cross-validation.
Solution Approach 2:
The patent employs three detectors instead of the minimum two required for rotation detection. This excessive action provides redundant measurement data that can be used to verify rotation state accuracy and detect failures, thereby improving measurement precision without significantly increasing device complexity.
3Reliability
If three detectors are used to enable failure detection, then the reliability of failure detection is improved, but the device complexity increases
Solution Approach 1:
The third detector serves multiple functions: it acts as an additional rotation detection sensor during normal operation and as a dedicated failure detection sensor when anomalies occur. This multi-functionality allows the system to improve reliability without proportionally increasing device complexity, as the same hardware component adapts its role based on operational needs.
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
The device effectively determines the rotation state and detects failures in sensors, enhancing system safety by providing clear failure signals and preventing operational errors.
Implementation Method 1
a light-emitting part configured to generate light and two light-receiving parts configured to receive light from the light-emitting part and generate light-receiving signals
Data Source
AI summary
A rotation detecting device includes a rotation operation part configured to be rotationally operated, a first detector configured to detect a rotation of the rotation operation part and output a first rotation detection signal, a second detector configured to output a second rotation detection signal, with a predetermined phase difference with respect to the first rotation detection signal, a third detector configured to output a third rotation detection signal, with each of a predetermined phase difference with respect to the first rotation detection signal of the first detector and a phase difference with respect to the second rotation detection signal of the second detector, and a controller configured to, based on the first rotation detection signal, the second rotation detection signal, and the third rotation detection signal, perform detection of a failure of the first detector, the second detector, or the third detector.