Rotation Detection Device Analog Digital Signal Selection
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Solution Overview
Problem
Existing rotation detection devices experience delays in calculating angle information due to digital calculations and communication processes.
Innovation Solution
A rotation detection device comprising a rotation angle sensor with at least three sensor elements and a control unit that calculates absolute angles using both analog and digital rotation angle information, allowing for reduced calculation delays by preferentially using analog signals when normal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signals are used for rotation angle detection and calculation, then reliability and noise immunity are improved, but calculation delay increases
Solution Approach 1:
The patent segments the rotation angle detection system into two parallel signal paths: one processing digital signals for high reliability and another processing analog signals for low delay. The control unit selectively uses analog signals when delay is the concern and digital signals when reliability is the concern, resolving the contradiction by dividing the detection function into multiple independent channels with different characteristics.
2Loss of time
If analog signals are used for rotation angle detection, then calculation delay is reduced, but noise immunity deteriorates
Solution Approach 1:
The patent introduces an abnormality determination mechanism as an intermediary that monitors both analog and digital signals. When the analog signal is determined to be abnormal (noisy), the system automatically switches to using the digital signal, thus protecting against noise while still allowing analog signals to be used during normal conditions for reduced delay.
3Measurement precision
If only digital signal processing is implemented, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent implements a dynamic signal selection mechanism where the control unit adaptively chooses between analog and digital signals based on the current operational requirements. When high precision is needed, digital signals are used; when fast response is prioritized, analog signals are used. This dynamic adaptation resolves the contradiction between precision and speed.
Data Source
AI summary
A rotation angle sensor has at least three detection elements for detecting a change in a physical quantity corresponding to a rotation position of a detection target, outputs rotation number information of the detection target corresponding to a detection value of at least one of the detection elements, and outputs rotation angle information of the detection target corresponding to the detection values of each of the detection elements as at least one analog signal and at least one digital signal. A control unit has an absolute angle calculation part and an abnormality determination part. The absolute angle calculation part outputs to a control calculation portion an absolute angle calculated using either the analog rotation angle, which is a rotation angle based on an analog signal, or the digital rotation angle, which is a rotation angle based on a digital signal, that is determined to be normal.