Engine Abnormality Detection via Atmospheric Pressure Adaptation
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Solution Overview
Problem
Existing abnormality determination methods for internal combustion engines face accuracy degradation due to wide detection regions, leading to false negatives when atmospheric pressure changes, especially when the engine operates outside the restricted detection region at lower pressures.
Innovation Solution
A control unit determines engine abnormalities based on atmospheric pressure values and operation states, including output shaft revolution speed and load, with specific preset regions for accurate abnormality detection, ensuring accurate determination even when atmospheric pressure decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection region is restricted to improve abnormality detection accuracy, then false positives are reduced, but the frequency of operation outside the detection region increases when atmospheric pressure decreases
Solution Approach 1:
The detection region is made dynamic by adjusting its boundaries based on atmospheric pressure conditions. When atmospheric pressure decreases, the detection region is expanded to include higher revolution speeds and lower loads, ensuring continuous abnormality detection capability across varying operational conditions while maintaining detection accuracy through pressure-based adaptation
Solution Approach 2:
The detection region parameters (revolution speed thresholds and load thresholds) are changed according to atmospheric pressure values. The control unit stores multiple detection regions corresponding to different atmospheric pressure conditions and selects the appropriate region based on current pressure measurements, thereby adapting the detection criteria to environmental conditions
2Adaptability or versatility
If the detection region is expanded to cover more operation states, then abnormality detection coverage is improved, but abnormality determination accuracy degrades due to false positives
Solution Approach 1:
The operational space is segmented into multiple detection regions, each corresponding to specific atmospheric pressure conditions. Instead of using a single universal detection region, the system divides the operation space into pressure-specific zones, allowing accurate detection within each segment while avoiding false positives that would occur in a unified oversized region
3Power
If atmospheric pressure decreases and the engine operates at higher revolution speeds to ensure negative pressure in the intake pipe, then engine performance is maintained, but the operation state moves outside the preset detection region
Solution Approach 1:
The system performs preliminary action by pre-defining multiple detection regions corresponding to different atmospheric pressure conditions before operation. When atmospheric pressure decreases, the control unit proactively switches to the appropriate detection region that accounts for higher revolution speeds, ensuring abnormality detection readiness before the operational shift occurs
Data Source
AI summary
A vehicle including an internal combustion engine provided with a plurality of cylinders, and a control unit that determines that an abnormality of the internal combustion engine has occurred when an atmospheric pressure has a first value and an operation state represented by at least one of an output shaft revolution speed and a load of the internal combustion engine is within a preset region and determines that an abnormality of the internal combustion engine has occurred when the atmospheric pressure has a second value that is lower than the first value and the operation state is outside the region.