Electromagnetic Valve Pressure Normality Across Command Regions
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Solution Overview
Problem
Conventional systems for determining the normality of an electromagnetic control valve incorrectly identify the valve as normal when it is failed, due to the use of a single pressure command region for normality determination, leading to incorrect assessments.
Innovation Solution
The system sets non-overlapping pressure command regions for determining the normality of the electromagnetic control valve, with each region assessing whether the difference between the actual pressure and the pressure command point is less than a threshold value, and only determines the valve as normal if all regions affirm normality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pressure command region is used for normality determination, then the determination process is simple, but the accuracy of normality determination deteriorates when the electromagnetic control valve is failed
Solution Approach 1:
The pressure command region is divided into multiple non-overlapping sub-regions (first pressure command region, second pressure command region, etc.). Each sub-region has its own threshold value for normality determination. This segmentation allows the system to accurately detect valve failures across different pressure ranges by checking which specific sub-region the current pressure command point falls into, thereby resolving the contradiction between simplicity and accuracy.
2Measurement precision
If multiple pressure command regions are used for normality determination, then the accuracy of normality determination is improved, but the determination process becomes more complex
Solution Approach 1:
Each pressure command sub-region is assigned a specific threshold value tailored to its local characteristics. The first pressure command region has a first threshold value, the second pressure command region has a second threshold value, and so on. This local quality approach allows each sub-region to be optimized for its specific pressure range, improving overall determination accuracy while maintaining a systematic and manageable complexity through clear regional differentiation.
Data Source
AI summary
An electromagnetic control valve normality determination system includes: a hydraulic pressure source; an electromagnetic control valve structured to regulate an actual pressure of oil to a pressure command point, wherein the oil is supplied from the hydraulic pressure source; and an actual pressure sensor structured to sense the actual pressure of the oil. For determining normality of pressure regulation of the electromagnetic control valve, a normality determinator is configured to: set pressure command regions for determination about pressure regulation of the electromagnetic control valve, without overlapping among the pressure command regions; determine for each of the pressure command regions whether a difference between the actual pressure and the pressure command point in the each of the pressure command regions is less than a threshold value; and determine that the electromagnetic control valve is normal, in response to affirmation of the determination for all of the pressure command regions.