Concentric Bypass Passage for Gasoline Particulate Filter
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Solution Overview
Problem
Existing gasoline particulate filter (GPF) systems face challenges with increased exhaust backpressure due to accumulated ash, which reduces engine torque and fuel economy, and previous bypass systems complicate component access and packaging.
Innovation Solution
A central bypass passage through the GPF with a converging cone and peripheral passages allows adjustable exhaust flow, reducing packaging size and facilitating valve access for maintenance, while controlling the valve position based on engine conditions to manage ash accumulation and regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bypass passage is located adjacent and parallel to the GPF enclosure, then the valve can control exhaust flow around the GPF, but the system diameter and packaging space increase
Solution Approach 1:
The bypass passage is positioned concentrically within the GPF enclosure, with the GPF surrounding the bypass passage. This nested arrangement allows the bypass system to utilize the internal space of the GPF housing rather than requiring additional external space, thereby reducing overall packaging volume while maintaining exhaust flow control capability
Solution Approach 2:
The bypass passage transitions from a parallel external arrangement to a concentric internal arrangement, changing the spatial dimensionality from radial to axial positioning. This dimensional reconfiguration allows the bypass system to integrate within the existing GPF footprint without increasing external dimensions
2Adaptability or versatility
If the valve is situated at the mouth of the annular passage within the GPF enclosure, then the bypass system can control exhaust flow, but access for repair and replacement becomes difficult
Solution Approach 1:
The valve is extracted from its traditional position at the mouth of the annular passage within the GPF enclosure and repositioned to an external location on the GPF housing. This extraction allows the valve to remain functionally integrated with the bypass system while being accessible from the exterior for maintenance and replacement operations
Solution Approach 2:
The bypass passage serves as an intermediary conduit that connects the externally positioned valve to the internal exhaust flow path. This intermediary structure allows the valve to control exhaust flow without requiring direct access to the internal passage mouth, enabling external valve positioning while maintaining functional connectivity
3Volume of stationary object
If the bypass system is integrated within the GPF enclosure, then packaging space is reduced, but heat accumulation increases posing durability challenges
Solution Approach 1:
The GPF housing is designed with differentiated thermal properties in different regions: the outer housing provides structural containment and heat shielding, while the internal bypass passage allows hot exhaust gases to flow through a dedicated channel that is thermally isolated from sensitive components. This local quality differentiation manages heat distribution to prevent accumulation while maintaining compact integration
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 configuration reduces exhaust backpressure, improves engine performance, and extends the life of the GPF by efficiently managing particulate matter and allowing easier valve maintenance.
Implementation Method 1
a converging cone forming a portion of the exhaust passage and arranged upstream of and connecting to the first portion
Implementation Method 2
controlling the valve position based on engine conditions to manage ash accumulation and regeneration
Implementation Method 3
the purpose of the filter is to filter soot particles, the soot particles consisting of solid carbon often with adsorbed hydrocarbons, out of exhaust gas flowing through the filter
Implementation Method 4
This configuration reduces exhaust backpressure, improves engine performance
Data Source
AI summary
Methods and systems are provided for an emission control device for an engine system including a gasoline particulate filter (GPF) and bypass passage for the GPF. In one example, the system may include a converging cone to direct exhaust flow through a central bypass passage, housing a valve, which originates upstream of the GPF and eventually passes through the center of it (thereby bypassing the GPF). In another example exhaust flow may travel through outer passages, coupled between the converging cone and GPF and spaced around the central bypass passage, to travel to the GPF.