Exhaust Purification System Differential Pressure Correction
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Solution Overview
Problem
Existing exhaust purification systems for internal combustion engines face challenges in accurately detecting the deposition amount of particulate matters in diesel particulate filters (DPFs), leading to inefficient filter regeneration and potential clogging.
Innovation Solution
The system includes a differential pressure detection device and a control device that detects the operation state of the internal combustion engine. The control device executes filter regeneration processing based on the detected differential pressure, applying correction factors to accurately estimate the particulate matter deposition amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter regeneration processing is performed frequently to remove particulate matters, then the filter clogging is prevented, but the fuel consumption increases
Solution Approach 1:
The system continuously monitors the differential pressure across the filter and uses this feedback to determine when regeneration is actually needed. The control device compares the measured differential pressure against reference values to detect deviations caused by micropore deposition, and only triggers regeneration when necessary, avoiding both over-regeneration (wasting fuel) and under-regeneration (causing clogging).
Solution Approach 2:
The patent replaces direct measurement of particulate matter deposition with an indirect measurement method using differential pressure sensing. By measuring the pressure difference across the filter and analyzing deviations from reference characteristics, the system can infer deposition amounts without mechanically accessing or directly measuring the particulate matters themselves.
2Use of energy by moving object
If filter regeneration processing is performed infrequently to save fuel, then the fuel efficiency is improved, but the filter may become clogged
Solution Approach 1:
The continuous monitoring of differential pressure provides real-time feedback on filter deposition status. The control device analyzes deviations from reference differential pressure characteristics to detect when micropore deposition has reached critical levels, ensuring regeneration is triggered at the optimal moment to prevent clogging while minimizing unnecessary fuel consumption.
Solution Approach 2:
The system uses differential pressure measurement and characteristic comparison to indirectly assess filter deposition state, replacing the need for direct particulate matter measurement. This allows for accurate, continuous monitoring that can reliably predict when regeneration is needed, balancing fuel efficiency with clogging prevention.
3Measurement precision
If differential pressure type estimation method is used to detect particulate matter deposition, then the measurement precision is improved, but the deviation from reference differential pressure occurs due to micropore deposition
Solution Approach 1:
The patent introduces reference differential pressure characteristics as an intermediary standard for comparison. By establishing reference characteristics that represent normal filter behavior and comparing actual measurements against these references, the system can detect deviations caused by micropore deposition and distinguish them from normal operational variations, thereby maintaining measurement precision while accounting for deposition effects.
Solution Approach 2:
The system monitors changes in differential pressure parameters over time and compares them against reference parameter characteristics. By detecting parameter deviations (changes in differential pressure behavior patterns) rather than relying on absolute values, the system can accurately assess deposition amounts even when micropore deposition causes shifts in the differential pressure characteristics.
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
This approach improves the estimation accuracy of particulate matter deposition, allowing for optimal filter regeneration frequency, reducing fuel consumption, and preventing filter clogging.
Implementation Method 1
a differential pressure detection device that detects a differential pressure across the filter, the differential pressure being a pressure difference of the exhaust gas between an inflow side and an outflow side of the filter
Implementation Method 2
fuel is added to the exhaust gas, and the fuel is reacted with an oxidation catalyst disposed on the upstream side of the filter to raise the temperature of the exhaust gas
Implementation Method 3
The filter has a wall provided with a large number of micropores that do not allow the particulate matters to pass therethrough, and the exhaust gas is passed through the micropores of the wall so that the particulate matters are collected
Implementation Method 4
filter regeneration processing of burning and removing the particulate matters deposited in the filter is periodically performed
Implementation Method 5
the particulate matters deposited in the filter is burned and removed
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An exhaust purification system (2) for an internal combustion engine (10) includes a filter (43) collecting a particulate matter in an exhaust gas, a differential pressure detection device (35) detecting a differential pressure across the filter, and a control device (50). The control device (50) executes filter regeneration processing of burning and removing the particulate matter deposited in the filter (43) when determining that the particulate matter exceeding a predetermined amount deposits in the filter (43) and a predetermined condition is satisfied, obtains, based on an operation state, an increase side correction amount by which the differential pressure across the filter is corrected to an increase side, obtains a corrected differential pressure in which the differential pressure across the filter is corrected using the increase side correction amount, and determines that the particulate matter exceeding the predetermined amount deposits in the filter (43) when the corrected differential pressure exceeds a predetermined threshold set in accordance with the predetermined amount.