Abnormality Diagnosis Device for Internal Combustion Engine Blowby Gas Passage
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Solution Overview
Problem
The accuracy of abnormality diagnosis in internal combustion engines, particularly in the blowby gas passage, is compromised due to the behavior of pressure fluctuations.
Innovation Solution
An abnormality diagnosis device for internal combustion engines that sets a reference value for pressure based on the engine's state when no peak is present, and uses peak pressure as a reference when peaks occur, accumulating differences to generate a cumulative value for diagnosing passage abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed reference value is used for pressure-based abnormality diagnosis, then the diagnosis method is simple, but the diagnosis accuracy deteriorates due to pressure fluctuations
Solution Approach 1:
The reference value is changed from a fixed constant to a dynamic value that adapts to pressure peaks. The setting unit dynamically adjusts the reference value based on detected pressure peaks, allowing the diagnosis system to adapt to varying pressure conditions while maintaining diagnostic accuracy.
Solution Approach 2:
The reference value parameter is changed from a static fixed value to a variable that changes based on pressure peak detection. When a pressure peak is detected, the reference value is updated to match the peak value, thereby adapting the diagnostic threshold to current operating conditions.
2Measurement precision
If the reference value is dynamically adjusted based on pressure peaks, then the diagnosis accuracy improves, but the system complexity increases
Solution Approach 1:
The system performs self-adjustment by automatically detecting pressure peaks and updating the reference value without external intervention. The setting unit monitors pressure fluctuations and autonomously modifies the reference value, reducing the need for manual calibration or complex external control systems.
Solution Approach 2:
The system implements feedback by continuously monitoring pressure values and using detected peaks to adjust the reference value. This closed-loop approach ensures that the reference value remains aligned with actual pressure conditions, improving diagnostic accuracy while using a relatively simple feedback mechanism.
3Quantity of substance
If accumulation starts from the first point in time when no peak is present, then more cumulative data is obtained, but the diagnosis may be affected by irrelevant pressure variations before the peak
Solution Approach 1:
The system performs preliminary identification of pressure peaks before starting the accumulation process. By detecting and marking pressure peaks in advance, the system ensures that accumulation begins at an appropriate reference point, filtering out irrelevant pre-peak pressure variations while capturing meaningful diagnostic data.
Data Source
AI summary
A setting unit which is connected to an intake passage and defines a reference value for a pressure in a passage through which gas flows, an accumulating unit which integrates a difference between the reference value and the pressure from a point in time when the pressure falls below the reference value and acquires an cumulative value, and a diagnosis unit which diagnoses an abnormality of the passage based on the cumulative value, wherein when there is no peak in the pressure, the setting unit sets the reference value based on a state of the internal combustion engine, and when there is a peak in the pressure, the setting unit sets the peak as the reference value in the abnormality diagnosis device.