Particulate Filter Regeneration via Exhaust Gas Bypass and Burner
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Solution Overview
Problem
Current particulate filter regeneration systems for diesel engines fail to reliably reduce particulate emissions below EPA standards due to inefficient regeneration methods that can lead to sulfate formation and catalyst burnout, resulting in excessive untreated emissions.
Innovation Solution
A system with a logic unit and regeneration module that monitors exhaust gas variables to selectively divert a portion of exhaust gases through a bypass channel, where a burner ignites the gases to raise their temperature, effectively regenerating the particulate filter while minimizing emissions and preventing catalyst damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a catalyst bed is directly subjected to aspirated fuel and high temperatures to burn off particulates, then regeneration effectiveness is improved, but sulfate formation and catalyst burnout increase
Solution Approach 1:
The exhaust flow is segmented into two separate passages: an inner passage that routes hot exhaust through the catalyst bed for particulate oxidation, and an outer passage that bypasses the catalyst bed. This segmentation allows the catalyst to be exposed to high temperatures and fuel for effective regeneration while preventing direct exposure to aspirated fuel that would cause sulfate formation and burnout.
Solution Approach 2:
The catalyst bed acts as an intermediary element positioned between the inner and outer passages. It receives heat from the inner passage exhaust to activate particulate burning while the outer passage provides a protective cooler exhaust flow that prevents excessive temperature exposure and sulfate formation on the catalyst.
2Productivity
If excess exhaust flow is vented directly to the atmosphere during the burning cycle, then regeneration speed is improved, but untreated particulate emissions increase
Solution Approach 1:
The inner and outer exhaust passages are merged at their downstream ends, allowing the hot exhaust from the catalyst bed (which has oxidized particulates) to mix with the cooler bypass exhaust. This combined flow is then routed to the atmosphere, ensuring that particulates are treated before emission while maintaining efficient regeneration throughput.
3Productivity
If the catalyst bed is positioned between the filter and fuel supply, then regeneration efficiency is improved, but catalyst exposure to aspirated fuel causes burnout
Solution Approach 1:
The exhaust system is divided into two separate flow paths that converge downstream. The inner passage directs fuel-rich hot exhaust through the catalyst bed for efficient regeneration, while the outer passage provides a fuel-poor cooler path. This segmentation ensures the catalyst receives necessary heat and oxygen for regeneration while being protected from direct fuel contact that would cause burnout.
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 significantly reduces particulate emissions by efficiently regenerating the filter, maintaining catalyst effectiveness, and ensuring compliance with EPA standards by controlling temperature and gas flow.
Implementation Method 1
a burner ignites the gases to raise their temperature
Implementation Method 2
This temperature is sufficient to cause the carbon particulates retained in the filter to begin burning
Data Source
AI summary
An apparatus, system, and method are disclosed for particulate filter regeneration. The apparatus includes a bypass exhaust channel configured to conduct exhaust gasses away from a main exhaust channel and reintroduce the exhaust gasses into the main exhaust channel upstream from a particulate filter, a burner, and a regeneration module configured to monitor exhaust gas variables and divert a portion of the exhaust gasses through the bypass exhaust channel in response to the exhaust gas variables. The system includes a vehicle having an internal combustion engine coupled to a transmission, and the apparatus. The method includes conducting exhaust gasses away from a main exhaust channel and reintroducing the exhaust gasses into the main exhaust channel, raising the temperature of the exhaust gasses, and monitoring exhaust gas variables and selectively diverting a portion of the exhaust gasses through a bypass exhaust channel in response to the exhaust gas variables.