Valve Position Detection Using Motor Current Profiles
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Solution Overview
Problem
Existing valve control systems in fail-safe applications often rely on redundant sensing to prevent unsafe failures, but they can be costly and prone to errors due to the need for switches, which are susceptible to ageing and environmental conditions, making them unreliable for detecting valve positions and states accurately.
Innovation Solution
A switchless valve control system that uses a driver with a mechanical connection to the valve, a current sensor to detect current magnitude, and an analysis module to determine valve positions and states based on current profiles, eliminating the need for physical switches and enhancing robustness against environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant sensing with position switches is used to detect valve positions, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the position switch component from the valve control system. Instead of using mechanical switches to detect valve positions, the system uses current sensing to monitor the electrical current drawn by the valve motor during operation. This extraction eliminates the mechanical switching components while maintaining position detection capability through electrical measurements, thereby reducing device complexity while preserving reliability.
Solution Approach 2:
The patent replaces the mechanical position switch system with an electrical current sensing system. The mechanical switches that physically detect valve positions are substituted with electrical current sensors that monitor the electrical characteristics of the valve motor. This substitution transitions from mechanical detection to electrical measurement, reducing mechanical wear and environmental susceptibility while maintaining accurate position detection.
2Measurement precision
If position switches are used to detect valve states, then measurement precision is improved, but susceptibility to environmental factors and ageing increases
Solution Approach 1:
The patent replaces mechanical position switches with electrical current sensing. The mechanical switches that are susceptible to environmental factors like moisture, dust, and vibration are substituted with electrical current sensors that measure the current drawn by the valve motor during operation. This substitution eliminates the mechanical components that degrade over time and are vulnerable to environmental conditions, while maintaining precise valve state detection through electrical measurements.
Solution Approach 2:
The patent enables the valve motor to serve dual purposes: both actuating the valve and providing position information through its current consumption pattern. The motor's electrical characteristics during operation naturally indicate valve position and state without requiring separate sensing components. This self-service approach allows the motor to provide both mechanical work and diagnostic information, reducing the need for additional components that could fail or be affected by environmental factors.
3Reliability
If redundant sensing components are added to prevent failures, then reliability is improved, but material cost increases
Solution Approach 1:
The patent extracts and removes redundant position switch components from the system. Instead of adding multiple sensing components to achieve fail-safe operation, the system uses a single current sensing approach that monitors valve position through electrical measurements. This extraction of unnecessary mechanical components reduces material costs while maintaining fail-safe capability through intelligent electrical monitoring and analysis of current profiles.
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 system effectively detects valve positions and states without switches, reducing material costs and maintaining reliability across varying conditions, ensuring robust operation and minimizing errors due to ageing or tampering.
Implementation Method 1
a current sensor electrically connected to the driver configured to detect a magnitude of current associated with the driver
Data Source
AI summary
One implementation is a device for determining the position of a valve. The device uses a current profile including at least the magnitude of current, and an analysis module for using the current profile and the state of the valve to perform at least one action.