Driving System Abnormality Detection for Intake Air Pressure Sensors
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Solution Overview
Problem
Existing driving systems face challenges in accurately determining abnormalities in detection value differences between atmospheric and intake air pressure sensors, particularly during engine stop conditions, leading to potential undetected issues before engine restart.
Innovation Solution
A driving system with an abnormality potential estimation module, an abnormality determination module, and an unusual state duration identification module, which estimate and determine abnormalities based on prolonged detection value differences in isobaric conditions, ensuring identification before engine restart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine stop time is extended to ensure accurate abnormality determination, then the reliability of abnormality detection is improved, but the loss of time for system availability increases
Solution Approach 1:
The system performs preliminary abnormality potential estimation during the engine stop period before restart occurs. By evaluating detection value differences and determining abnormality status in advance, the system ensures reliable detection without requiring extended stop times, thus resolving the contradiction between detection reliability and time loss.
2Measurement precision
If the abnormality determination threshold is set to require longer duration of unusual states, then the false positive rate is reduced, but the response time to detect actual abnormalities increases
Solution Approach 1:
The abnormality detection process is segmented into two distinct stages: (1) abnormality potential estimation that identifies candidates with detection value differences exceeding thresholds, and (2) abnormality determination that confirms actual abnormalities after sustained duration. This segmentation allows early identification of potential issues while maintaining strict confirmation criteria, thus improving both response time and accuracy.
3Measurement precision
If the system continuously monitors detection value differences with strict abnormality criteria, then the measurement precision of abnormality detection is improved, but the device complexity increases
Solution Approach 1:
The system utilizes existing sensors (intake air pressure sensor and atmospheric pressure sensor) and their detection values to perform self-diagnosis. By computing detection value differences and applying predetermined thresholds, the system achieves precise abnormality detection without requiring additional specialized hardware, thus maintaining simplicity while improving measurement precision.
Data Source
AI summary
A driving system, vehicle, and control method in which a difference between the detection value of an intake air pressure sensor and an atmospheric pressure sensor is computed as a detection value difference in the engine stop condition. An estimate of a potential for an abnormality of the detection value difference is determined, or the abnormality of the detection value difference is determined according to the duration time of an unusual state having the detection value difference of greater than a preset reference value. In an ignition-on state, when a delayed activation is requested, it is identified whether the abnormality in the detection value difference is to be determined. The delayed activation is requested in response to confirmation of a potential abnormality condition where there is a potential for an abnormality in the detection value difference but the abnormality in the detection value difference is not determined.