Solenoid Valve Current-Signal Detection for Opening State Estimation
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Solution Overview
Problem
Current automatic medical analysis apparatuses lack sensors to detect solenoid valve abnormalities, leading to potential sample wastage due to undetected valve failures, and existing methods are inadequate for solenoid valves with small driving current waveforms and varying factors affecting the waveform.
Innovation Solution
A solenoid valve abnormality detection device that extracts feature data from the driving current pattern, corrects for temperature effects, and uses an estimation model to accurately determine the solenoid valve's opening state based on driving current information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is added to detect solenoid valve abnormalities, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The solenoid valve itself serves as the detection target by monitoring its own driving current characteristics. The system uses the existing driving current signal to detect abnormalities without requiring external sensors, making the solenoid valve self-diagnostic through electrical characteristic analysis
Solution Approach 2:
The patent replaces mechanical/physical sensors (position sensors, vibration sensors) with electrical signal analysis. By analyzing the driving current waveform characteristics, the system substitutes complex mechanical detection systems with simpler electrical measurement and processing
2Measurement precision
If a sensor is provided for each solenoid valve, then detection precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent creates a universal detection method that works for all solenoid valves in the system. A single detection apparatus can monitor multiple solenoid valves by analyzing their respective driving current characteristics, making the detection system multi-functional without requiring individual sensors for each valve
3Device complexity
If driving current information is used for small solenoid valves, then device complexity is reduced, but measurement precision deteriorates due to small waveform and superimposed factors
Solution Approach 1:
The patent extracts specific feature quantities from the driving current waveform that are characteristic of solenoid valve opening/closing states. By identifying and isolating these key features (such as current rise time, peak current, waveform shape characteristics), the system separates the useful diagnostic information from the noisy background signal
Solution Approach 2:
The patent transforms the raw driving current signal into meaningful diagnostic parameters by analyzing waveform characteristics. It changes the representation from time-domain current values to feature-based parameters (such as rate of change, amplitude ratios, temporal patterns) that enhance detectability and reduce the impact of superimposed factors
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 accurate estimation of solenoid valve states, minimizing sample wastage and facilitating timely maintenance by detecting abnormalities through feature data analysis and temperature correction.
Implementation Method 1
a driving current pattern which is associated with solenoid valve opening of the solenoid valve and which is detected by a current sensor
Data Source
AI summary
The present invention accurately estimates the opening state of a solenoid valve using a feature amount based on driving current information of the solenoid valve. A solenoid valve abnormality detection device, which uses a driving current pattern associated with valve opening of a solenoid valve and detected by a current sensor to detect an abnormality of the solenoid valve, comprises: a feature amount extraction unit that determines a feature amount of a driving current pattern associated with valve opening of the solenoid valve within a predetermined detection period; a feature amount correction unit that estimates the valve temperature of the solenoid valve; and an opening state estimation unit that estimates the opening state of the solenoid valve using the feature amount value corrected by the feature amount correction unit.