Electrodynamic Valve Diagnosis Using Coil Induction Signals
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Solution Overview
Problem
Miniaturized valves with electrodynamic actuators face challenges in space-saving design and magnetic force generation, and lack effective diagnostic capabilities due to limited sensor compatibility with small stroke movements.
Innovation Solution
A method for diagnosing electrodynamic actuators by measuring and evaluating electrical variables such as current and voltage over time, allowing for the determination of induction-dependent valve variables without external sensors, using a diagnosis module integrated into the electric circuit of the coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the valve is miniaturized to save space, then the space requirement is reduced, but the magnetic force generation capability deteriorates
Solution Approach 1:
The patent changes the actuation principle from electromagnetic to electrodynamic, fundamentally altering the physical parameters of force generation. The electrodynamic actuator uses a moving coil in a magnetic field to generate force through electromagnetic induction, achieving higher force density in miniaturized configurations compared to traditional electromagnetic actuators with stationary coils
Solution Approach 2:
The patent replaces the traditional electromagnetic actuator mechanism with an electrodynamic actuator mechanism. This substitution enables effective force generation in miniaturized valves by using a moving coil that experiences electromagnetic force when current flows through it in the presence of a magnetic field from permanent magnets
2Reliability
If sensors are added to monitor valve state, then diagnostic capability is improved, but device complexity increases
Solution Approach 1:
The electrodynamic actuator serves dual purposes: it actuates the valve and simultaneously provides diagnostic information through its electrical characteristics. By monitoring current, voltage, and impedance of the moving coil, the system self-diagnoses valve state (open, closed, stuck, clogged) without requiring external sensors, thus improving reliability while avoiding increased complexity
Solution Approach 2:
The electrodynamic actuator is designed to perform multiple functions: primary valve actuation and secondary diagnostic monitoring. The same electrical components (coil, power supply, control circuit) used for actuation also provide measurement capabilities for detecting valve position and diagnosing faults, eliminating the need for separate sensor systems
3Measurement precision
If conventional sensors are used to detect stroke, then measurement capability is provided, but they fail to reliably detect small stroke movements in electrodynamic actuators
Solution Approach 1:
The patent replaces mechanical/optical sensor-based stroke detection with electrical parameter-based detection. By measuring changes in current, voltage, and impedance of the moving coil, the system accurately detects valve stroke and position without the limitations of conventional sensors when dealing with small stroke movements in miniaturized electrodynamic actuators
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 direct diagnosis of valve states, including movement and potential issues like sticking or clogging, without additional sensors, providing a cost-effective and simple diagnostic function for miniaturized electrodynamic actuators.
Implementation Method 1
an armature made of a magnetic material is moved by a magnetic field generated by a coil
Implementation Method 2
evaluating the time course of the electrical variable to determine at least one induction-dependent valve variable
Data Source
AI summary
A method of diagnosing a valve is described, which has an electrodynamic actuator, which includes a magnet arrangement for generating a magnetic field and a control element which is movable relative to the magnet arrangement and is coupled to a movably arranged coil. At least one electrical variable of the electrodynamic actuator is measured over a measurement period to detect a time course of the electrical variable. The time course of the electrical variable is evaluated over an evaluation period to determine at least one induction-dependent valve variable which is assigned to the motion profile of the electrodynamic actuator. A diagnosis module and a valve are furthermore described.