Position/Displacement Transducer Switching Across Encoder Transition Regions
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Solution Overview
Problem
Existing incremental encoders face challenges in managing transition regions of discontinuity in periodicity, leading to count loss and imprecision due to the use of reference markers and complex adjustment systems, which increase installation and operational costs.
Innovation Solution
A position/displacement transducer apparatus using a pair of encoders along a measurement path with a transition region, where the controller switches from one encoder to another based on signal errors to manage the transition, eliminating the need for additional components and ensuring continuous position/displacement measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference markers and complex adjustment systems are used to manage transition regions, then measurement precision is improved, but device complexity increases and installation costs rise
Solution Approach 1:
The patent extracts and eliminates the transition region discontinuity from the measurement path by using overlapping encoder reading windows. The controller identifies when a reading window encompasses a transition region and excludes those measurements, thereby removing the harmful discontinuity effect without adding reference markers or adjustment systems.
Solution Approach 2:
The controller continuously monitors encoder signals for errors indicating transition region presence. When error signals are detected, the controller adjusts the measurement strategy by selecting alternative reading windows or excluding affected data, providing real-time feedback-based correction without additional hardware components.
2Reliability
If multiple encoders with switching control are used to manage transition regions, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the measurement path into multiple segments defined by different reading windows with different lengths. Each reading window is optimized for specific path conditions, and the controller segments the measurement process by selecting appropriate windows based on detected transition regions, thereby improving reliability through diversified measurement approaches.
Solution Approach 2:
The controller dynamically adjusts the reading window selection and length based on real-time detection of transition regions. The system transitions between different measurement strategies automatically, using longer reading windows when transition regions are detected and shorter windows during normal operation, providing adaptive reliability without permanent complexity.
3Measurement precision
If transition regions are managed with additional components, then measurement precision is maintained, but ease of manufacture deteriorates
Solution Approach 1:
The encoder system performs self-diagnosis by monitoring its own output signals for errors indicating transition region presence. The controller automatically identifies and compensates for transition regions using the existing encoder outputs, enabling the system to service itself without external reference markers, alignment tools, or additional calibration components.
Solution Approach 2:
The existing encoder outputs serve multiple functions: normal position measurement and transition region detection. The same encoder signals used for primary measurement also provide error indicators that trigger adaptive measurement strategies, eliminating the need for separate reference markers or dedicated transition detection hardware.
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 solution provides efficient and precise position/displacement measurement across transition regions without additional components, reducing errors and costs, and enabling self-installation and adaptation to changes in the measurement path.
Implementation Method 1
one or more sensors suitable for detecting the physical quantity transduce its periodic change into one or more periodic electric signals
Implementation Method 2
typically of the Hall effect or magneto-resistive type
Implementation Method 3
typically of the Hall effect or magneto-resistive type
Data Source
AI summary
A position/displacement transducer apparatus includes encoders arranged along a measurement path along which a position/displacement encoding periodic array is arranged, having contiguous elements with alternate dual characteristics. There is at least one transition region of discontinuity in periodicity of the periodic array and/or unreadable, the periodic array subject to a mutual motion with respect to encoders along the measurement path, defining the ends of a reading window having a greater length than the estimated maximum size of the transition region so they are not simultaneously involved by the transition region during mutual motion. A controller emits a transduced position/displacement on the basis of signals from encoders and switches from use of one encoder to use of the other to manage the presence of the transition region. The controller switches from default use temporarily to use of the upstream encoder while the downstream encoder is at the transition region.