Intake Pressure Sensor Abnormality Detection via Throttle Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing abnormality detection techniques for intake pressure sensors in internal combustion engines face errors when the throttle opening is close to full close or full open positions, leading to inaccurate determination of sensor failures due to small pulsation widths, especially when sensors are shared across multiple cylinders.
Innovation Solution
An abnormality detection device comprising an intake pressure sensor, a throttle opening sensor, and a determination unit that compares intake pressure results across different throttle openings to accurately determine sensor abnormalities, improving detection accuracy by considering both the change amount in one cycle and pressure differences between throttle positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only the pulsation of intake pressure is used as a reference for abnormality detection, then the detection method is simple, but detection accuracy deteriorates in regions where throttle opening is close to full close or full open positions due to small pulsation width
Solution Approach 1:
The patent transitions from one-dimensional pulsation width analysis to two-dimensional analysis by incorporating throttle opening position as an additional dimension. The determination unit compares intake pressure across different throttle opening regions, enabling accurate abnormality detection even when pulsation width is small by considering the pressure relationship across multiple operating points.
2Quantity of substance
If intake pressure sensor is shared across multiple cylinders to reduce cost, then device cost is reduced, but detection accuracy deteriorates due to averaged pressure signals reducing pulsation characteristics
Solution Approach 1:
The patent performs preliminary comparison of intake pressure across different throttle opening regions before making abnormality determination. By establishing the pressure relationship at multiple operating points in advance, the system can detect abnormalities even when using a shared sensor, as the comparison reveals deviations from expected pressure patterns that would be obscured in single-point measurements.
Data Source
AI summary
An abnormality detection device includes: an intake pressure sensor configured to detect an intake pressure of an internal combustion engine; an opening sensor configured to detect a throttle opening of the internal combustion engine; and a determination unit configured to determine, based on detection results of the intake pressure sensor and the opening sensor, whether the intake pressure sensor is abnormal. The determination unit determines, based on a result of intake pressure comparison between different throttle openings, whether the intake pressure sensor is abnormal.