Acoustic volume in hot-end of exhaust systems
a technology of exhaust system and hot-end, which is applied in the direction of mechanical equipment, machines/engines, instruments, etc., can solve the problems of short exhaust system, insufficient volume and/or length to achieve the desired tailpipe noise level, and insufficient area required for such volum
Inactive Publication Date: 2020-06-04
FAURECIA EMISSIONS CONTROL TECH GERMANY
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Problems solved by technology
Short exhaust systems, such as those encountered with hybrid vehicles or rear engine vehicles for example, often have insufficient volume and / or length to achieve a desired tailpipe noise level in combination with acceptable back pressure levels.
One traditional solution to attenuate such frequencies is to provide more internal volume; however, due to tight packaging constraints, the area required for such volume is not available.
Another solution to attenuate these lower frequencies is to use valves; however, valves drive a higher back pressure at lower revolutions-per-minute, which is not desirable.
Method used
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[0028]FIG. 1 shows a schematic representation of a vehicle exhaust system 10 as a long pipe that conducts hot exhaust gases generated by an engine 12 through various exhaust components to reduce emission and control noise as known. The various exhaust components can include one or more of the following: pipes, filters, valves, catalysts, mufflers etc. The exhaust system 10 includes a hot end 14 that is located immediately downstream of the engine 12 and a cold end 16 that is downstream of the hot end 14. The long pipe is considered closed at an engine end 18 and open at an opposite end 20 where, after passing though the various exhaust components, the engine exhaust gas exits the exhaust system 10 to atmosphere.
[0029]Exhaust components at the hot end 14 can include, for example, exhaust gas treatment elements such as a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), a gasoline particulate filter (GPF), and a selective catalytic reduction (SCR) catalyst that are u...
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A vehicle exhaust system includes a component housing defining an internal cavity, a first exhaust gas treatment element positioned within the internal cavity, a second exhaust gas treatment element positioned within the internal cavity and axially spaced from the first exhaust gas treatment element by a gap, and a resonator volume in communication with the internal cavity.
Description
BACKGROUND OF THE INVENTION[0001]An exhaust system conducts hot exhaust gases generated by an engine through various exhaust components to reduce emissions, improve fuel economy, and control noise. Short exhaust systems, such as those encountered with hybrid vehicles or rear engine vehicles for example, often have insufficient volume and / or length to achieve a desired tailpipe noise level in combination with acceptable back pressure levels. Further, as gasoline particulate filter (GPF) technology emerges into the market, corresponding increases in exhaust system back pressure will need to be offset in order to avoid adverse effects on fuel economy or performance.[0002]In addition to addressing issues raised by the introduction of GPF technology, other emerging powertrain technologies are requiring the industry to provide even more stringent noise reduction. The frequencies that need to be attenuated are being pushed to lower and lower frequencies not previously having to have been a...
Claims
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IPC IPC(8): F01N1/02F01N3/28F01N3/033G10K11/172
CPCF01N2230/04G10K11/172F01N3/2885F01N3/0335F01N1/023F01N2230/02F01N1/00F01N3/021F01N3/28F01N13/00F01N3/08F01N1/02F01N1/089F01N2490/00F01N13/0097Y02A50/20Y02T10/12F01N13/1805
Inventor LAGIER, JEANEGAN, JAMESLARBI, DJAFARGONZALEZ, MARIONBLANCO-SOTELO, FREDERIC
Owner FAURECIA EMISSIONS CONTROL TECH GERMANY