Exhaust Gas System Parallel Lines Adsorber Leakage
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Solution Overview
Problem
Existing exhaust gas systems face challenges in reducing leakage flow through adsorbers when the exhaust gas adjusting means is opened, and they are not cost-effective in using ceramic carriers due to design complexity and embedding requirements.
Innovation Solution
The exhaust gas system features parallel exhaust gas lines with a gas-permeable element upstream of the adsorber, eliminating the need for an aperture plate and reducing leakage flow by controlling the exhaust gas flow resistance, allowing for the use of ceramic carriers by simplifying their mounting and reducing design complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the exhaust gas adjusting means is opened to guide exhaust gas through the main line, then the adsorber can be bypassed and system response time is improved, but leakage flow through the adsorber increases reducing efficiency
Solution Approach 1:
A gas-permeable element is introduced as an intermediary component between the exhaust gas flow and the adsorber. This element allows controlled passage of exhaust gas while preventing unwanted leakage flow through the adsorber when the adjusting means is opened, thus resolving the contradiction between fast response time and leakage prevention
2Reliability
If ceramic carriers are used in the adsorber, then adsorption performance is improved, but manufacturing complexity and cost increase due to embedding requirements
Solution Approach 1:
The complex embedding structure required for ceramic carriers is eliminated by extracting the ceramic carrier from its traditional enclosed position and placing it in a configuration where it can function without complex embedding, thus maintaining adsorption performance while simplifying manufacturing
3Manufacturing precision
If an aperture plate is used to control exhaust gas flow, then flow distribution is improved, but device complexity increases
Solution Approach 1:
The gas-permeable element serves as an intermediary flow control component that replaces the aperture plate. It achieves flow distribution control through its permeable properties rather than requiring precise mechanical aperture structures, thus maintaining flow distribution while reducing device 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
This design effectively reduces leakage flow and enables the use of ceramic carriers, optimizing exhaust gas flow and emissions reduction while simplifying the system's design and reducing costs.
Implementation Method 1
situated upstream from the adsorber is an exhaust gas flow-conducting, gas-permeable element which separates the auxiliary line (and thus the inlet area of the adsorber) from the remaining exhaust gas-conducting areas of the exhaust gas system
Implementation Method 2
an adsorber for reversible sorption of unburnt hydrocarbons (HC) and/or nitrogen oxides (NOx)
Data Source
AI summary
The invention relates to an exhaust gas system (10) for an internal combustion engine (12), having an exhaust gas path which includes at least in sections two parallel exhaust gas lines (34, 36), namely a main line (34) and an auxiliary line (36), an adsorber (46) for reversible sorption of unburnt hydrocarbons (HC) and/or nitrogen oxides (NOx) being situated in the auxiliary line (36); having an adjusting means (48) for selectively guiding an exhaust gas flow into the main line (34) and/or into the auxiliary line (36) and having a main catalytic converter (44) situated downstream from the parallel exhaust gas lines (33, 36). An exhaust gas flow-conducting, gas-permeable element (58) is provided upstream from the adsorber (46), which separates the auxiliary line (36) from the remaining exhaust gas flow-conducting areas. In addition, the adsorber (46) may also be equipped with a particle filtering function and/or a catalytic function.