Solenoid Diagnosis Using Multi-Stage Current Verification
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Solution Overview
Problem
Existing solenoid control systems lack precision in determining solenoid normality, as they do not guarantee normal operation with higher current values necessary for driving the solenoid valve, potentially leading to unpredictable brake fluid flow and user experience issues.
Innovation Solution
A solenoid control apparatus and diagnosis method that determine solenoid normality by using multiple instruction duty ratios to verify current values, first ensuring the solenoid is not driven and then driven, thereby improving precision and avoiding premature brake fluid flow variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a small current value is used to determine solenoid normality, then the solenoid valve is not driven and the diagnosis is simple, but the precision of solenoid normality determination is insufficient
Solution Approach 1:
The diagnosis process is segmented into multiple stages: initial diagnosis with small current, provisional normality determination, and final normality determination with larger current. This segmentation allows the system to balance between simplicity and precision by dividing the determination process into manageable steps with increasing current values.
Solution Approach 2:
The system performs preliminary diagnosis actions using small current values first to quickly identify obviously abnormal solenoids, then proceeds to more comprehensive testing with larger current values only when needed. This preliminary action approach reduces unnecessary complexity while maintaining determination precision.
2Reliability
If a larger current value is used to drive the solenoid valve for diagnosis, then the solenoid functionality is thoroughly verified, but brake fluid flow varies and causes user experience issues
Solution Approach 1:
The system performs preliminary verification with small current values to check basic solenoid functionality before proceeding to operational current values. This preliminary check ensures that obviously defective solenoids are identified without causing brake fluid flow variations, while still allowing thorough verification when necessary.
Solution Approach 2:
The diagnosis current value is dynamically adjusted based on the diagnosis stage and solenoid response. The system starts with small current values and progressively increases to operational current values only when lower currents indicate normal solenoid operation, thereby minimizing brake fluid flow variations while ensuring thorough verification.
3Measurement precision
If multiple current values are used to determine solenoid normality, then the precision of determination is improved, but the diagnosis time increases
Solution Approach 1:
The system performs preliminary assessment using small current values first to quickly identify abnormal solenoids. Only solenoids that pass the preliminary check proceed to additional verification with larger current values, thereby reducing the average diagnosis time while maintaining high precision for both normal and abnormal cases.
Solution Approach 2:
The diagnosis process is segmented into conditional stages where not all solenoids undergo the complete multi-current verification sequence. The segmentation allows the system to achieve high precision determination while minimizing unnecessary testing time for solenoids that fail early checks or clearly pass initial assessment.
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
Enhances the precision of solenoid normality determination, ensuring stable brake fluid flow and user experience by confirming solenoid functionality with both low and high current values, and provides visual warnings for abnormal states.
Implementation Method 1
a solenoid used to drive a solenoid valve that controls a flow of a brake fluid
Data Source
AI summary
A solenoid is determined abnormal if a current flowing therethrough at a certain duty ratio falls within an abnormal range. After the abnormal determination, a first duty ratio is used to cause a current to flow through the solenoid at such a current value within a first range as to not drive the solenoid valve. The solenoid is determined provisionally normal if the current at the first duty ratio falls within the first range. After the provisionally normal determination, a second duty ratio is used to cause a current to flow through the solenoid at such a current value within a second range including a current value range greater than the first range as to drive the solenoid valve. The solenoid is determined normal if the current at the second duty ratio falls within the second range.