Compact Vehicle Pollution Control System with Flat Housing
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Solution Overview
Problem
Existing depollution systems for vehicles, particularly all-terrain vehicles with four-wheel drive, face installation challenges due to their bulky design, which prevents the use of cylindrical pollution control systems on exhaust lines because of radial size constraints imposed by transmission return modules.
Innovation Solution
A compact depollution system with an elongated box housing an oxidation catalyst and particulate filter, featuring a flat surface that reduces the cross-section, allowing easier installation while maintaining pollution control functionality, and manufactured in one piece without welding, allowing for progressive transition zones to minimize flow disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a cylindrical pollution control system is used, then the depollution function is maintained, but the radial size is too large to fit next to the transmission return module
Solution Approach 1:
The housing is designed with an asymmetric cross-section featuring a flat surface instead of a fully cylindrical symmetric shape. This asymmetric design reduces the radial dimension in the direction toward the transmission return module, enabling installation in the constrained space while preserving the internal volume required for depollution functionality.
Solution Approach 2:
The invention compensates for the reduced radial size by extending the housing in the longitudinal dimension. The elongated shape with a flat surface allows the system to maintain adequate internal volume for the catalyst and filter by increasing length rather than radial depth, thus fitting into the available space next to the return module.
2Ease of operation
If the housing cross-section is reduced with a flat surface, then the radial size is reduced for better installability, but the internal volume is reduced affecting depollution function
Solution Approach 1:
The housing adopts an elongated configuration that compensates for the volume reduction caused by the flat cross-section. By increasing the length of the housing in the longitudinal direction, the internal volume is restored to sufficient levels while maintaining the reduced radial profile needed for installation next to the transmission return module.
3Ease of manufacture
If the box is made in one piece with a flat surface, then manufacturing is simplified, but the transition zone may disrupt exhaust gas flow
Solution Approach 1:
The transition zone between the flat and curved portions of the housing is designed with progressive curvature rather than a sharp angle. This localized geometric modification in the transition region allows smooth exhaust gas flow while maintaining the overall flat-surfaced elongated shape that enables simplified one-piece manufacturing and reduced radial size.
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
Enables the installation of a compact pollution control system in reduced spaces next to bulky components while preserving the original pollution control function, with enhanced manufacturing simplicity and minimal volume loss compensation.
Implementation Method 1
a second coaxial cylindrical monolith to the first and substantially of the same diameter as the latter, and performing the function of oxidation catalyst
Implementation Method 2
a first cylindrical ceramic monolith impregnated with precious metals and ensuring the function of filtering the soot particles emitted by the engine
Data Source
Figure 1~3B
Figure 4A~5
AI summary
The invention relates to a pollution control system (100) for a vehicle powertrain, comprising a housing (2, 102) intended to be mounted on the exhaust line of a vehicle internal combustion engine, said housing (2, 102) containing an oxidation catalyst (3) and a particulate filter (4, 104). The main characteristic of a pollution control system (100) according to the invention is that the housing (102) is elongated and has a flat section (120) adapted to reduce the cross-section of said housing (102), and in that said flat section (120) extends at least partially along said housing (102).