Valve Position Sensor Calibration Using Magnetometer and Gyroscope
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In large processing plants, especially in the oil and gas industry, determining the position of valves beyond those with cabled connections is challenging due to the high cost of cabled monitoring equipment, making it impractical for widespread use, and existing methods are inefficient and prone to errors in complex systems.
Innovation Solution
A low-cost valve position sensor system using a magnetometer and processing unit to estimate valve position wirelessly, which is calibrated using geomagnetic field data and optionally gyroscope data, allowing for remote monitoring without cabling and reducing maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cabled monitoring equipment is used to determine valve positions, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex cabled mechanical monitoring systems with a wireless sensor system consisting of a magnetometer, gyroscope, and transmitter. The magnetometer detects magnetic field changes caused by valve position changes, while the gyroscope provides orientation data, and the transmitter wirelessly communicates position information to external receivers, eliminating the need for physical cabling while maintaining measurement precision
Solution Approach 2:
The patent changes the measurement parameter from direct mechanical position sensing to magnetic field sensing. By using a magnetometer to detect changes in the magnetic field caused by the movement of magnetic components on the valve, the system converts mechanical position changes into magnetic field variations, which are then processed to determine valve position
2Reliability
If cabled monitoring equipment is deployed across the system, then reliability of valve position data is improved, but loss of time for installation and maintenance increases
Solution Approach 1:
The wireless sensor system eliminates the need for physical cabling installation and maintenance. The sensor unit attaches to the valve using non-invasive mounting methods, and data is transmitted wirelessly, dramatically reducing both installation time and ongoing maintenance requirements while maintaining continuous monitoring capability
Solution Approach 2:
The sensor system operates autonomously once installed, with the magnetometer continuously detecting magnetic field changes, the processing unit automatically calculating valve position from the sensor data, and the transmitter actively communicating position information without requiring manual intervention or maintenance
3Ease of manufacture
If low-cost wireless sensors are used, then ease of manufacture and deployment is improved, but measurement precision may deteriorate
Solution Approach 1:
The patent combines multiple sensing technologies (magnetometer and gyroscope) into a single integrated sensor unit. The magnetometer detects magnetic field changes while the gyroscope measures orientation, and both data streams are processed together to calculate accurate valve position, compensating for individual sensor limitations and improving overall measurement precision
Solution Approach 2:
The system continuously monitors magnetic field changes and gyroscope orientation data, processes this feedback information through the processing unit to calculate valve position, and transmits the results wirelessly. This closed-loop feedback mechanism ensures continuous accurate measurement and allows for real-time correction of any drift or errors
4Ease of operation
If wireless battery-powered sensors are deployed, then ease of operation and scalability is improved, but use of energy increases
Solution Approach 1:
The transmitter operates in periodic intervals rather than continuously, transmitting valve position data at predetermined time intervals or when position changes exceed a threshold. This periodic transmission mode significantly reduces energy consumption compared to continuous transmission while maintaining effective monitoring capability
Solution Approach 2:
The system dynamically adjusts transmission parameters based on valve position stability. When the valve remains stationary, transmission frequency is reduced or suspended to conserve battery energy. When position changes are detected, the system increases transmission activity to report the new state, optimizing the balance between monitoring effectiveness and energy consumption
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 reliable, cost-effective, and energy-efficient monitoring of valve positions across a system, providing comprehensive data on valve operation and maintenance needs, with reduced installation and maintenance costs, and improved accuracy over long periods.
Implementation Method 1
one or more micro sensors, the one or more micro sensors including a magnetometer; a processing unit configured to receive data from the magnetometer and compare the received magnetometer data with predetermined calibration data to provide an estimate of the valve position
Implementation Method 2
The use of magnetometer data to determine position provides a reliable means to determine the position of the valve, which requires no additional components, being able to function based on the surrounding magnetic field, such as the local geomagnetic field
Data Source
AI summary
A valve position sensor is described. The valve position sensor includes a sensor housing for placement on a moving component of a valve. A print circuit board assembly is disposed within the housing. The print circuit board assembly includes one or more micro sensors that includes a magnetometer and a gyroscope. A processing unit performs a calibration routine that associates magnetometer data received from the magnetometer with valve position data received from the gyroscope. The processing unit receives data from the magnetometer and compares the received magnetometer data with the calibration data to determine valve position data relating to an estimate of the valve position. A transmitter wirelessly transmits event data including valve position data to an external receiver.