Position Detecting Device Parallel Sensor Read Circuit
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Solution Overview
Problem
Existing position detecting devices using magnetic sensors suffer from poor responsiveness due to the need to sequentially read outputs from multiple sensors, leading to increased size and cost due to extensive wiring requirements.
Innovation Solution
A position detecting device employing n magnetic detectors with DA converters that convert n-bit digital signals into analog output signals, allowing the position detecting unit to rapidly identify the position of a moving body with reduced wiring and processing time, and optionally using a second AD converter for precise position specification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If outputs from multiple magnetic sensors are read sequentially, then the position can be detected, but processing time increases and responsiveness deteriorates
Solution Approach 1:
The patent combines the outputs from multiple magnetic sensors into a single parallel read operation. Instead of sequentially reading from each sensor, the system reads all sensor outputs simultaneously through a single read cycle, thereby maintaining position detection accuracy while dramatically reducing processing time and improving responsiveness.
2Loss of time
If wiring is provided to each magnetic sensor for collective reading, then responsiveness improves, but routing space increases and device size/cost increases
Solution Approach 1:
The patent implements a universal read mechanism that can read outputs from multiple magnetic sensors through a single read operation. This multi-functional approach allows the system to access all sensor data without requiring separate dedicated wiring paths for each sensor, thereby reducing routing space and device complexity while maintaining fast responsiveness.
3Measurement precision
If a large number of magnetic sensors are used for precise position detection, then measurement precision improves, but processing time increases due to sequential reading
Solution Approach 1:
The patent merges the reading operations of multiple magnetic sensors into a single parallel read cycle. By simultaneously reading from all sensors rather than sequentially processing each one, the system maintains high position detection accuracy with numerous sensors while significantly improving detection speed and productivity.
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
This approach enhances responsiveness by enabling rapid detection of a moving body's position while minimizing device size and cost, with the ability to quickly and accurately specify detailed positions and calculate movement parameters.
Implementation Method 1
Each of the number n of magnetic detectors has a magnetic sensor element configured to detect magnetism from a magnet mounted on a moving body and output an analog detection signal responsive to the magnetism
Data Source
AI summary
A number n of Hall elements of a position detecting device output analog detection signals responsive to magnetism from a magnet of a piston. A number n of AD converters carry out analog to digital conversion to convert the analog detection signals into digital detection signals. A ladder circuit receives, as an n-bit digital signal, the digital detection signals output from a number n of magnetic detectors, and performs digital to analog conversion thereof into a single analog output signal. A control IC detects an approximate position of the piston on the basis of the single analog output signal that is input thereto.