Accelerometer Valve Position Feedback With Wireless Calibration Simplicity
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Solution Overview
Problem
Magnet sensor systems used in process control systems for valve position feedback are sensitive to temperature changes, require complex calibration, and have limited mounting flexibility, leading to accuracy issues and increased costs due to the need for multiple calibration steps and varied sensor sizes for different control devices.
Innovation Solution
Implementing an accelerometer-based position sensor that directly measures the position of a valve actuator, providing a wireless feedback signal that is less sensitive to temperature changes and requires only a single calibration, allowing for greater flexibility in mounting and reducing manufacturing and installation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnet sensor systems are used for valve position feedback, then position measurement is achieved, but temperature sensitivity and calibration complexity increase
Solution Approach 1:
The patent replaces magnet sensor systems with accelerometer-based sensing. Accelerometers use mechanical proof masses and capacitive sensing elements to detect position through acceleration measurements, eliminating the magnetic field dependency and associated temperature sensitivity and calibration issues of magnet sensors.
Solution Approach 2:
The patent changes the sensing parameter from magnetic field detection to acceleration-based position detection. By measuring acceleration and integrating to obtain position, the system achieves temperature-insensitive operation with simplified calibration requirements, as accelerometers have inherent mechanical reference frames.
2Measurement precision
If magnet sensor systems are used for valve position feedback, then position measurement is achieved, but mounting flexibility is limited
Solution Approach 1:
The patent makes the position feedback device universally applicable to different valve types and mounting configurations. The accelerometer-based sensor can be mounted on various actuator types (pneumatic, hydraulic, electric) and valve styles (globe, butterfly, ball) without requiring specific magnetic mounting surfaces or orientations, providing genuine multi-functionality across process control applications.
3Measurement precision
If multiple calibrated sensor types are used for different control devices, then measurement accuracy is maintained, but equipment and installation costs increase
Solution Approach 1:
The patent segments the position feedback function from the specific actuator or valve type, creating a universal accelerometer-based sensor that can be applied across multiple device categories. This single sensor design replaces the need for multiple specialized magnet sensor variants, reducing manufacturing complexity and installation costs while maintaining measurement accuracy through the accelerometer's inherent mechanical reference system.
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 accelerometer position sensor maintains accuracy across varying temperatures without additional compensation, simplifies calibration, and can serve multiple control devices with a single type, reducing equipment and installation costs while enhancing installation ease and network efficiency.
Implementation Method 1
an accelerometer that is coupled to the process control device and that generates a signal indicative of a position of the actuator
Data Source
AI summary
An accelerometer wireless position transducer or sensor is physically coupled to a control device in a process control system and includes an accelerometer that generates a signal based on a position of the control device or its actuator. The transducer converts the accelerometer signal into a wireless signal that includes a value indicative of the actuator position, and causes the wireless position feedback signal to be transmitted over a wireless channel to a valve controller, e.g., by using a short-range wireless protocol. The controller controls the valve based on the value included in the wireless signal. In some configurations, the feedback signal is received at a device paired with the transducer, and the paired device transmits the feedback signal to the controller. The paired device may be paired with multiple transducers and/or sensors, and may transmit various feedback signals to multiple recipient controllers and other devices.