Pulse Counting Metering for Flow Direction and Low-Power Reading
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Solution Overview
Problem
Mechanical utility metering devices require manual reading, which is costly and inefficient, and existing electrical-based devices often rely on mechanical detection methods, limiting their effectiveness in accurately measuring flow and direction of utilities like gas and water.
Innovation Solution
A semiconductor-based metering system with a pulse counter architecture, incorporating detectors, counters, and a wake circuit for low power operation, and wireless communication capabilities to accurately measure and transmit utility usage data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical metering devices are used, then utility consumption can be measured, but manual reading is required which increases operational cost and reduces efficiency
Solution Approach 1:
The patent replaces mechanical detection systems with semiconductor-based electronic detection. The metering wheel with magnets interacts with reed switches to generate electrical signals that are processed by counters and controllers, eliminating the need for manual mechanical reading and enabling automated digital communication of consumption data.
Solution Approach 2:
The metering device performs self-reading through automated pulse counting and data processing. The system automatically detects wheel position changes, counts pulses, calculates consumption, and transmits data remotely without requiring utility personnel to manually read the meter, thereby improving productivity while managing complexity through integration.
2Measurement precision
If continuous operation mode is used, then accurate metering can be maintained, but power consumption increases
Solution Approach 1:
The controller operates in periodic cycles, switching between active and sleep modes. During active periods, it processes pulse counts and updates consumption data; during sleep periods, it minimizes power consumption. This periodic operation maintains measurement precision by periodically sampling the metering wheel position while significantly reducing overall power usage compared to continuous operation.
Solution Approach 2:
The pulse counting mechanism continuously tracks metering wheel position changes through the interaction of magnets and reed switches, ensuring no measurement gaps. The system maintains continuous monitoring capability while the controller intelligently manages power states, ensuring measurement continuity without requiring the entire system to remain continuously active.
3Measurement precision
If mechanical detection methods are used in electrical-based devices, then utility consumption can be measured, but accuracy in determining flow direction is limited
Solution Approach 1:
The patent uses asymmetric positioning of multiple magnets on the metering wheel relative to the reed switches. This asymmetric arrangement creates distinct pulse patterns for clockwise versus counter-clockwise rotation, enabling accurate flow direction detection. The asymmetric configuration allows the system to distinguish rotation direction based on the sequence and timing of pulse signals generated by different magnet-switch interactions.
Solution Approach 2:
The system transitions from simple rotation detection to bidirectional rotation detection by incorporating multiple detection points (multiple magnets and reed switches). This multi-dimensional approach uses the spatial arrangement and sequential activation of multiple sensors to determine not only that rotation occurs but also the direction of rotation, enhancing measurement precision without excessive complexity.
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
Enables efficient, accurate, and cost-effective metering of utility usage with reduced power consumption, allowing for remote data transmission and automatic updates, thereby reducing operational expenses and enhancing metering precision.
Implementation Method 1
a first detector to receive a first signal from a first switch configured to open and close based on position of a metering wheel associated with a flow line and a second detector to receive a second signal from a second switch configured to open and close based on the metering wheel position
Implementation Method 2
multiple counters, including a first counter to count within a first range based on a change in a state of at least one of the first and second signals in a first direction and a second counter to count within a second range based on a state change in a second direction
Implementation Method 3
a wake circuit to cause a controller to wake up when at least one of the first and second counters reaches an end of its range
Implementation Method 4
Such circuitry may include a programmable integrator to enable a level detection of the signals if a given number of samples of the corresponding signal at a given level have occurred during a sample period
Implementation Method 5
a radio circuit to couple with an antenna to wirelessly communicate metering information received from the first die
Data Source
AI summary
An apparatus can include a first detector to receive a first signal from a first switch configured to open and close based on position of a metering wheel associated with a flow line. The apparatus can further include a first counter to count within a first range based on a change in a state of the first signal. Using this information, the apparatus can determine usage and direction of, e.g., a fluid or liquid flowing along the flow line.