Absolute Position Detection Across Counter Rollover Interruptions
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Solution Overview
Problem
Existing position detection devices face challenges in accurately detecting the absolute position of a detection target that has moved beyond the upper limit value of the detector, particularly during wide-range movements or interruptions in detection processing.
Innovation Solution
A position detection device comprising a detector that outputs a count value, an extended data storage unit for storing integrated values during rollover, a position calculation unit that adds the count value and integrated value to determine absolute position, and a confirmation processing unit that verifies the appropriateness of extended data based on count sections, ensuring accurate position detection even beyond the detector's range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the detector count value range is used as the detection range, then the device structure is simple, but the detection range is limited and cannot detect positions beyond the upper limit value
Solution Approach 1:
The patent extends the one-dimensional count value range by introducing a second dimension: the isolation number representing the number of rollovers. This allows the system to detect positions beyond the detector's inherent range by combining the count value (within one cycle) with the isolation number (number of cycles), effectively creating an extended position space without requiring a physically larger detector.
Solution Approach 2:
The system performs preliminary actions by storing the origin position data before detection begins, and by pre-establishing the relationship between count values and their corresponding isolation numbers. This preliminary setup enables the system to accurately calculate absolute positions even when the detection target moves beyond the detector's normal range, as the reference framework is already in place.
2Measurement precision
If the count value simply returns to zero after exceeding the upper limit value, then the detector operation is simple, but accurate position detection beyond the upper limit value becomes impossible
Solution Approach 1:
The system implements feedback by continuously monitoring the count value and detecting when rollover occurs. Each time the count value transitions from the upper limit back to zero, the isolation number is incremented. This feedback mechanism preserves position information that would otherwise be lost, allowing the system to track the detection target's position accurately even after multiple cycles beyond the detector's nominal range.
Solution Approach 2:
The isolation number acts as an intermediary that bridges the gap between the detector's limited count value range and the实际需要 of wide-range position detection. By introducing this intermediate variable that counts the number of rollovers, the system can reconstruct the absolute position by combining the current count value with the accumulated isolation number, thereby preventing information loss.
3Reliability
If position detection processing is interrupted and the detection target moves to a position exceeding the detection range, then the detector can physically detect the position, but accurate position calculation becomes difficult
Solution Approach 1:
The system employs self-service by using the detector's own count value and the stored origin position data to automatically calculate the absolute position, even after interruptions. The confirmation processing unit self-corrects potential errors by verifying whether the calculated position is appropriate based on the isolation number and count section information, eliminating the need for external intervention or complex additional hardware.
Solution Approach 2:
The system performs preliminary actions by storing the origin position data and establishing the count section divisions before detection begins. This preliminary setup enables rapid and accurate position calculation after interruptions, as the reference framework and calculation methodology are already in place, reducing the complexity of post-interruption position reconstruction.
4Length of moving object
If extended data is stored to track rollover values, then position detection beyond the upper limit becomes possible, but data storage requirements and computational load increase
Solution Approach 1:
The patent segments the position detection function into two independent parts: the count value (stored in the detector's register) and the isolation number (stored in the extended data storage unit). This segmentation allows the system to extend the detection range by adding only the minimal necessary data (the isolation number) rather than storing complete position information, thereby minimizing data volume while achieving the extended range capability.
Data Source
AI summary
A position detection device according to the present disclosure includes: a detector which outputs a count value corresponding to a position of a detection target, and repeating values from zero until an upper limit value; an extended data storage unit which stores extended data corresponding to an integrated value of change amount in the count value by the rollover; a position calculation unit which calculates an absolute position of the detection target by adding the count value outputted by the detector and the integrated value indicated by the extended data; a section storage unit which, among count sections defined by dividing the range of the count value into at least three, stores the count section in which the count value received from the detector is included; and a confirmation processing unit which confirmation appropriateness of the extended data, based on an isolation number between the count section stored by the section storage unit during position detection processing start, and the count section in which the count value is included after position detection processing start.