Compact Exhaust Silencer with External Evacuation Duct
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Solution Overview
Problem
Existing exhaust line silencers for combustion engines are difficult to compact while maintaining acoustic performance, especially in hybrid vehicles where additional components are integrated, and their sizing affects engine operation and noise reflection.
Innovation Solution
A compact silencer design with three volumes and strategically positioned evacuation ducts outside the casing, allowing for flexible sizing and orientation, which maintains acoustic performance and mechanical consistency without additional mechanical means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the exhaust line is shortened and compacted to accommodate additional components in hybrid vehicles, then the silencer becomes more compact and can be positioned under the body, but the acoustic performance deteriorates and engine operation is affected
Solution Approach 1:
The evacuation duct is positioned outside the silencer casing envelope, utilizing the external space around the silencer rather than internal volume. This dimensional reorganization allows the silencer to maintain compact dimensions while preserving acoustic performance by keeping the evacuation path separate from the acoustic treatment volumes.
Solution Approach 2:
The silencer is divided into distinct functional volumes (upstream, intermediate, downstream) with the evacuation duct serving as a separate external component. This segmentation allows each volume to be optimized for its specific function while the overall assembly maintains a compact footprint suitable for hybrid vehicle integration.
2Length of stationary object
If the exhaust line is shortened to position the evacuation pipe under the body in front of the rear axle, then the exhaust line becomes more compact, but the acoustic reflection performance deteriorates
Solution Approach 1:
The evacuation duct is routed externally around the silencer casing rather than through its internal volume. This external positioning maintains the integrity of the internal acoustic volumes and their reflection surfaces, preserving acoustic performance while achieving the required compact length for hybrid vehicle integration.
3Object-generated harmful factors
If the silencer volumes are increased to maintain acoustic performance, then the silencer becomes less compact, but additional mechanical means are required to maintain envelope positioning
Solution Approach 1:
By positioning the evacuation duct outside the silencer casing, the internal volumes can be maximized for acoustic performance without increasing the overall external dimensions. This eliminates the need for additional mechanical positioning means while maintaining both acoustic effectiveness and compactness.
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 achieves improved acoustic performance and compactness, allowing the silencer to be integrated under vehicle tunnels, accommodating other components while ensuring efficient exhaust gas circulation and noise reduction.
Implementation Method 1
maintain the same type of acoustic reflection for the silencer
Implementation Method 2
The silencer comprises one or more casing(s) which delimit(s) three volumes, called upstream, intermediate and downstream, arranged successively and traversed by a plurality of ducts
Data Source
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AI summary
The invention relates to a muffler (S) intended to be mounted in an exhaust line (L) of a heat engine (M), said muffler comprising one or more shells defining three volumes (1a, 1b, 2), referred to as upstream (1a), intermediate (1b) and downstream (2), arranged in succession and passed through by a plurality of pipes including: a supply pipe (10) for feeding the exhaust gases from the engine (M) into the intermediate volume (1b) via the upstream volume (1a); a so-called forward path pipe (12) for bringing the exhaust gases from the intermediate volume (1b) into the downstream volume (2); a so-called return path pipe (13) for feeding the exhaust gases from the downstream volume (2) into the upstream volume (1a) via the intermediate volume (1b); and a discharge pipe (14, 14') provided predominantly outside the shell(s) and leading out of the upstream volume (1a).