Engine PM Filter Regeneration Diagnosis Using Differential Pressure Change
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Solution Overview
Problem
Existing methods for determining abnormalities in the regeneration function of internal combustion engine filters are prone to errors due to variations in filter tolerance and aging, leading to incorrect determinations.
Innovation Solution
A control device for internal combustion engines that includes a filter differential pressure acquisition unit, a pre-post regeneration differential pressure difference acquisition unit, and a PM regeneration function determination unit, which uses pre- and post-regeneration differential pressure differences to accurately assess the regeneration function, corrected for volume flow rate and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure difference between upstream and downstream sides of the filter is used to determine abnormality in regeneration function, then the determination can be made, but the determination may be erroneous due to variations in tolerance during manufacture or aging of the filter
Solution Approach 1:
The patent changes the parameter used for abnormality determination from absolute pressure difference values to the change in pressure difference (ΔΔP) before and after regeneration. This transforms the measurement approach to account for manufacturing tolerances and aging effects, as the focus shifts from the absolute value to the dynamic change during the regeneration process.
Solution Approach 2:
The system uses feedback by measuring the pressure difference before regeneration, performing regeneration, then measuring again after regeneration. The abnormality is determined based on whether the pressure difference changed significantly during regeneration, creating a feedback loop that validates the regeneration process effectiveness while compensating for initial variations.
2Productivity
If the filter is subjected to high temperature during regeneration process, then the trapped PM is regenerated, but the filter may be damaged or melted
Solution Approach 1:
The control device uses feedback control to monitor the pressure difference during regeneration and adjust the regeneration process accordingly. When the pressure difference indicates complete regeneration or potential filter damage, the system automatically terminates or adjusts the regeneration process, preventing excessive temperature exposure while ensuring complete PM removal.
Solution Approach 2:
The regeneration process is made dynamic rather than static, with the temperature and duration adjusted in real-time based on pressure difference measurements. This allows the system to optimize regeneration efficiency while preventing filter damage by adapting the process parameters continuously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately determines the functionality of the PM regeneration process, avoiding erroneous determinations caused by filter aging or manufacturing tolerances.
Implementation Method 1
a filter provided in an exhaust passage of the internal combustion engine to trap particulate matter (PM) in an exhaust gas
Implementation Method 2
The filter is exposed to a high temperature during the regeneration process
Implementation Method 3
The filter is exposed to a high temperature during the regeneration process
Data Source
AI summary
A control device for an internal combustion engine includes a filter for collecting PM in an exhaust pipe connected to an engine body, and a PM regeneration function for regenerating the filter for collecting PM. The control device of the internal combustion engine includes a filter differential pressure acquisition unit that acquires a filter differential pressure, a pre-regeneration filter differential pressure acquired by the filter differential pressure acquisition unit prior to regeneration of the filter, a pre-post regeneration differential pressure difference acquisition unit that acquires a pre-regeneration differential pressure difference that is a difference between a post-regeneration filter differential pressure acquired by the filter differential pressure acquisition unit after regeneration of the filter, and a PM generation function determination unit that performs an anomaly determination of PM regeneration function when the acquired pre-regeneration differential pressure difference is equal to or less than a preset threshold.