Lubricant Dilution Detection with Temperature-Based Pressure Thresholds
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Solution Overview
Problem
Current methods for detecting lubricant dilution in lubrication systems are inadequate and prone to false diagnoses, failing to accurately identify dilution and often misdiagnosing its presence.
Innovation Solution
A lubricant dilution detection system that includes a controller with sensors for pressure and temperature, utilizing a low idle condition to determine a variable lubricant pressure threshold based on temperature, and outputs an indication of dilution when the sensed pressure falls below this threshold, thereby reducing false positives and negatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods are used to detect lubricant dilution, then detection capability is provided, but false diagnoses occur and detection accuracy deteriorates
Solution Approach 1:
The patent changes the operating parameters for detection by specifically selecting low idle conditions (engine speed between 500-1000 RPM) as the detection window, and dynamically adjusting the pressure threshold based on temperature. This parameter change approach resolves the contradiction by finding optimal detection conditions that minimize false diagnoses while maintaining detection sensitivity.
Solution Approach 2:
The patent implements dynamic threshold adjustment based on temperature compensation. The pressure threshold is not fixed but varies with lubricant temperature, allowing the system to adapt to changing operating conditions. This dynamic approach improves both detection accuracy and reliability by preventing false positives that would occur with static thresholds.
2Measurement precision
If a fixed pressure threshold is used for dilution detection, then the detection method is simple, but detection accuracy deteriorates under varying temperature conditions
Solution Approach 1:
The patent introduces temperature as a compensating parameter to adjust the pressure threshold. By establishing a relationship between temperature and threshold values (through calibration data or lookup tables), the system achieves accurate detection across varying temperatures without requiring complex real-time calculations, thus balancing precision and complexity.
Solution Approach 2:
The patent performs preliminary calibration to establish the relationship between temperature and pressure threshold values before actual operation. This preliminary action creates a reference database or calculation model that simplifies real-time detection, avoiding the need for complex on-the-fly computations while maintaining high detection accuracy.
3Measurement precision
If detection is performed under various operating conditions, then detection coverage is improved, but false diagnoses increase due to pressure regulator valve interference
Solution Approach 1:
The patent applies local quality by selecting a specific operating condition window (low idle with pressure regulator valve closed) for detection rather than attempting to detect under all conditions. This localized approach ensures that detections are made only when the system state guarantees accurate readings, thereby maintaining high reliability while providing sufficient detection coverage for practical purposes.
Solution Approach 2:
The patent prevents false diagnoses by anticipating and avoiding the problematic condition where the pressure regulator valve is open. By proactively selecting detection conditions where the valve is closed, the system eliminates the source of false positives before they can occur, rather than attempting to correct or compensate for them afterward.
Data Source
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AI summary
Systems (100) and methods (300) for lubricant dilution detection are disclosed. A method (300) for detecting lubricant dilution for a lubrication system (14) includes detecting a low idle condition (420). The method (300) includes receiving sensed values indicative of lubricant pressure and lubricant temperature during the low idle condition (420). The method (300) also includes determining a lubricant pressure threshold (415) based on the sensed value indicative of lubricant temperature. The method (300) further includes determining lubricant dilution based on the sensed value indicative of lubricant pressure and the determined lubricant pressure threshold (415) during the low idle condition (420). In accordance with a determination that there is lubricant dilution, the method (300) includes outputting an indication of the lubricant dilution.