Self-Calibrating Wheel Revolution Counter for Drift Compensation
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Solution Overview
Problem
Mechanical counters used for gas, water, or electricity distribution face challenges in reducing electrical consumption and maintaining high precision due to mechanical drifts caused by vibrations, wear, aging, and temperature variations, which affect the accuracy of revolution counting.
Innovation Solution
A self-calibration method for the counting device that dynamically adjusts the detection intervals of the inductive circuits based on the signals from both detection devices, allowing for incremental revolution counting without dedicated energy-consuming operations or special components, thereby maintaining drift below acceptable thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection intervals are fixed, then the device structure is simple, but mechanical drifts cause counting inaccuracies over time
Solution Approach 1:
The patent implements dynamic detection intervals that automatically adjust based on the detected signal characteristics. The counting device transitions from fixed intervals to variable intervals that adapt to mechanical drifts, vibrations, and wear phenomena, thereby maintaining high counting accuracy without requiring complex external calibration systems
Solution Approach 2:
The detection device performs self-calibration by using its own detection signals to automatically adjust its detection parameters. The system monitors its own performance and modifies its detection intervals based on detected drift patterns, eliminating the need for external calibration equipment or manual intervention
2Measurement precision
If dedicated calibration operations are implemented, then counting precision is maintained, but electrical consumption increases
Solution Approach 1:
The patent implements continuous self-calibration that occurs during normal counting operations rather than requiring separate calibration phases. The detection device continuously monitors its own performance and makes real-time adjustments, ensuring that calibration is an ongoing process integrated into the main function, thereby maintaining accuracy without additional energy-consuming calibration operations
Solution Approach 2:
The patent merges the calibration function with the counting function by using the same detection devices and signal processing circuits for both purposes. The system simultaneously performs revolution counting and self-calibration using identical hardware resources, eliminating the need for separate calibration operations and their associated energy consumption
3Adaptability or versatility
If the detection intervals are adjusted dynamically, then precision is maintained under varying conditions, but the control system becomes more complex
Solution Approach 1:
The patent implements a feedback mechanism where the detection device monitors its own output signals and uses this information to automatically adjust its detection intervals. The system compares detected signal characteristics against reference values and modifies its operation accordingly, creating a closed-loop control system that adapts to mechanical drifts, vibrations, and environmental changes while maintaining relatively simple control logic
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 self-calibration method effectively reduces electrical consumption and enhances precision, ensuring accurate counting of revolutions over extended periods with minimal energy usage and reduced mechanical drift.
Implementation Method 1
a first detection device comprising a first inductive circuit and a second detection device comprising a second inductive circuit
Data Source
Figure 1
Figure 2~5
Figure 6
AI summary
A method for self-calibrating a counting device (5) for the revolutions of a wheel (6) equipped with an off-center target (7) whose trajectory is opposite a portion of which a first detection device and a second detection device are mounted to provide a detection signal representative of the presence or absence of the target. A counting unit is adapted to produce a definite signal of the presence of the target (7) when the detection signal is within a first interval, to produce a definite signal of the absence of the target (7) when the detection signal is within a second interval, and to produce an indefinite signal when the detection signal is within a third interval.The process includes a self-calibration step in which, when the counting unit produces an indeterminate signal, the width of the first and/or second interval is modified according to the last signal determined for this detection device, the detection signal of the other detection device and the last signal determined for the other detection device.