DPF Soot Preloading After Regeneration for Stable PM Filtration
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Solution Overview
Problem
Diesel particulate filters (DPFs) experience reduced particulate matter reduction efficiency after regeneration due to larger pore sizes allowing soot to pass through, failing to meet stringent particulate number (PN) regulations without structural changes or improvements.
Innovation Solution
A method involving regenerative, efficiency enhancement, and normal operation modes to manage soot deposition in DPFs, using parameters like engine rpm, torque, and air-fuel ratio to stabilize efficiency, with adjustments in EGR, common rail pressure, fuel injection timing, and throttle position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diesel particulate filter is regenerated to remove all accumulated soot, then the particulate matter removal capability is restored, but the pore size becomes relatively larger allowing soot to pass through easily, which lowers particulate matter reduction efficiency and may fail to meet regulatory standards
Solution Approach 1:
The patent applies preliminary action by intentionally depositing a controlled amount of soot back into the DPF after regeneration. This pre-deposition creates a barrier layer before normal operation resumes, preventing soot from passing through the enlarged pores while maintaining filtration efficiency. The soot is deposited in advance to prepare the filter for efficient particulate matter capture.
2Reliability
If the amount of particulate matter deposited in the diesel particulate filter increases, then the particulate matter reduction efficiency increases up to a certain extent, but when it accumulates to a limit and becomes clogged, regeneration is required which causes pore size enlargement
Solution Approach 1:
The patent implements periodic action by cycling between regeneration phases (which enlarge pores) and controlled soot deposition phases (which restore filtration efficiency). This periodic alternation prevents the filter from remaining in a continuously degraded state with enlarged pores, instead rhythmically restoring its particulate matter capture capability through controlled soot accumulation followed by regeneration.
3Reliability
If structural changes or improvements are made to the diesel particulate filter to maintain efficiency after regeneration, then particulate matter reduction efficiency can be maintained, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies parameter changes by modifying the soot deposition parameter (amount and timing) rather than changing the physical structure of the DPF. By controlling the soot deposition quantity to a preset initial deposition amount after regeneration, the system maintains filtration efficiency through operational parameter adjustment instead of structural modification, thereby avoiding increased device complexity and manufacturing costs.
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
Stably maintains particulate matter reduction efficiency post-regeneration, meeting exhaust gas regulations without altering the DPF structure.
Implementation Method 1
diesel particulate filters (DPFs) are widely used to reduce particulate matter (PM) emitted from diesel engines
Implementation Method 2
it goes through a regeneration process that removes the deposited particulate matter by burning it at high temperatures
Implementation Method 3
the exhaust gas contains sufficient oxygen to internally burn the soot deposited in the diesel particulate filter (DPF)
Data Source
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AI summary
The present invention relates to a particulate matter reduction method for reducing particulate matter emitted from an internal combustion engine using a Diesel Particulate Filter (DPF), wherein the particulate matter reduction method according to an embodiment of the present invention comprises: a step of operating in a regenerative operation mode to combust and remove deposited particulate matter when particulate matter in the Diesel Particulate Filter exceeds a preset allowable deposition amount; a step of operating in an efficiency enhancement mode to forcibly increase a soot amount to deposit particulate matter up to a preset initial deposition amount in the Diesel Particulate Filter after the regenerative operation mode is terminated; and a step of stopping the forced increase of the soot amount and operating in a normal operation mode when the efficiency enhancement mode is terminated.