Gas-Permeable Adsorption Unit for Intake Noise and Hydrocarbon Management
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Solution Overview
Problem
Internal combustion engines experience reduced adsorption capability over time due to combustion residue settlement, leading to increased emissions and noise pollution, especially after shutdown, as existing adsorption units fail to efficiently regenerate and manage hydrocarbons.
Innovation Solution
An adsorption unit with a bypass chamber and gas-permeable adsorption medium, where combustion gas flows through a bypass line to uniformly desorb hydrocarbons from the adsorption element, combining efficient emission reduction with noise muffling by utilizing underpressure and a conical flow guiding section to minimize pressure losses and turbulences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adsorption element with solid adsorption medium is used, then hydrocarbons can be adsorbed during engine shutdown, but combustion residues settle in the radial outer area over time causing loading increase and adsorption capability decrease
Solution Approach 1:
The patent uses a gas-permeable adsorption medium with porous structure instead of solid adsorption material. The porous structure allows combustion gas to flow through the entire volume of the adsorption medium from outside to inside, preventing combustion residue settlement and maintaining uniform adsorption capability throughout the service life.
Solution Approach 2:
The patent utilizes the pneumatic flow of combustion gas through the bypass line and through the gas-permeable adsorption medium to achieve automatic regeneration. The gas flow carries desorbed hydrocarbons away and prevents combustion residue accumulation, maintaining adsorption reliability over time.
2Reliability
If the adsorption element is regenerated by flowing combustion gas through it during operation, then adsorption capability is restored, but pressure losses and turbulences increase
Solution Approach 1:
The patent introduces a bypass line as an intermediary flow path that guides combustion gas through the adsorption medium in a controlled manner. This intermediary structure enables regeneration while minimizing direct interference with the main flow, reducing pressure losses and turbulences.
Solution Approach 2:
The patent changes the physical state and flow parameters of combustion gas by guiding it through the bypass line and through the porous adsorption medium. This parameter change allows for efficient desorption and regeneration while maintaining acceptable pressure loss characteristics.
3Ease of manufacture
If the adsorption unit structure is simplified, then manufacturing cost is reduced, but noise muffling capability is insufficient
Solution Approach 1:
The patent designs the adsorption element to serve multiple functions simultaneously: it acts as both an adsorption medium for hydrocarbon capture and a sound-absorbing element for noise muffling. The gas-permeable porous structure provides both adsorption capability and acoustic attenuation, eliminating the need for separate components.
Solution Approach 2:
The patent merges the adsorption function and sound absorption function into a single integrated adsorption element. The porous adsorption medium structure simultaneously captures hydrocarbons and attenuates noise, simplifying the overall unit structure and reducing manufacturing complexity.
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
The solution ensures permanent and uniform reduction of emissions and noise pollution by automatically regenerating the adsorption unit, maintaining optimal desorption efficiency with minimal pressure loss and space requirements, integrating sound absorption and adsorption functions.
Implementation Method 1
the adsorption medium is gas-permeable
Implementation Method 2
an adsorption unit arranged in an intake conduit of the intake manifold for adsorption of hydrocarbons
Implementation Method 3
an absorption muffler of an intake manifold for combustion gas of an internal combustion engine, in particular of a motor vehicle, for muffling intake noise during intake of the combustion gas
Data Source
AI summary
An adsorption unit for combustion gas of an internal combustion engine has an adsorption housing having a chamber section with an inner wall. An adsorption element disposed in the adsorption housing is made of a gas-permeable adsorption medium that is formed to a hollow body and encloses an interior of the adsorption element. The hollow body has opposed open ends. A main flow passage extends through the hollow body and the combustion gas flows in main flow direction through the hollow body. The adsorption element has an exterior circumferential side facing away from the interior and delimiting together with the inner wall of the chamber section a bypass chamber surrounding the absorption element outwardly. In the main flow direction, the bypass chamber has a downstream end that is closed off and an upstream end that has at least one bypass opening that communicates with the main flow passage.