Exhaust gas system
AssigneeFriedrich Boysen GmbH & Co. KG
InventorMichael Mueller
Life of this patent
Estimating the term…
Abstract
An exhaust gas system for combustion engines is provided having at least one exhaust gas duct, in particular an exhaust pipe, and having an exhaust gas treatment device such as an oxidation catalyst, an SCR catalyst or a diesel particulate filter downstream of the exhaust gas duct, wherein, to improve the efficiency of downstream gas treatment devices, at least one secondary flow duct, in particular a secondary flow pipe, is provided in the exhaust gas duct with a cross-section reduced with respect to the exhaust gas duct which imparts coerced guidance of some of the exhaust gas flow differing from the actual exhaust gas flow.
Claims19
An exhaust gas system for combustion engines having at least one exhaust gas duct, in particular an exhaust pipe, and having an exhaust gas treatment device downstream of the exhaust gas duct, wherein at least one secondary flow duct, in particular a secondary flow pipe, is provided in and completely arranged within the exhaust gas duct with a cross-section reduced with respect to the exhaust gas duct, wherein the secondary flow duct imparts coerced guidance of some of the exhaust gas flow differing from an actual exhaust gas flow so that a flow direction of the exhaust flow through the secondary flow duct differs from a main exhaust gas flow direction of the actual exhaust gas flow surrounding the secondary flow duct, and
- wherein the secondary flow duct is made and arranged such that a part exhaust gas flow is guided radially inwardly to the central region of the exhaust gas duct.
An exhaust system for combustion engines having at least one exhaust gas duct, in particular an exhaust pipe, and having an exhaust gas treatment device downstream of the exhaust gas pipe, wherein at least one secondary flow duct, in particular a secondary flow pipe, is provided in and completely arranged within the exhaust gas duct with a cross-section reduced with respect to the exhaust gas duct, wherein the secondary flow duct imparts coerced guidance of some of the exhaust gas flow differing from an actual exhaust gas flow so that a flow direction of the exhaust gas flow through the secondary flow pipe differs from a main exhaust gas flow direction of the actual exhaust gas flow surrounding the secondary flow duct, and
- wherein a plurality of secondary flow ducts are arranged distributed evenly over the cross-section of the exhaust gas duct.
An exhaust system for combustion engines having at least one exhaust gas duct, in particular an exhaust pipe, and having an exhaust gas treatment device downstream of the exhaust gas pipe, wherein at least one secondary flow duct, in particular a secondary flow pipe, is provided in and completely arranged within the exhaust gas duct with a cross-section reduced with respect to the exhaust gas duct, wherein the secondary flow duct imparts coerced guidance of some of the exhaust gas flow differing from an actual exhaust gas flow so that a flow direction of the exhaust gas flow through the secondary flow pipe differs from a main exhaust gas flow direction of the actual exhaust gas flow surrounding the secondary flow duct, and
- wherein a plurality of secondary flow ducts are arranged distributed unevenly over the cross-section of the exhaust gas duct.
An exhaust system for combustion engines having at least one exhaust gas duct, in particular an exhaust pipe, and having an exhaust gas treatment device downstream of the exhaust gas pipe, wherein at least one secondary flow duct, in particular a secondary flow pipe, is provided in and completely arranged within the exhaust gas duct with a cross-section reduced with respect to the exhaust gas duct, wherein the secondary flow duct imparts coerced guidance of some of the exhaust gas flow differing from an actual exhaust gas flow so that a flow direction of the exhaust gas flow through the secondary flow pipe differs from a main exhaust gas flow direction of the actual exhaust gas flow surrounding the secondary flow duct, and wherein the outlet end of the at least one secondary flow duct is inclined toward the main exhaust gas flow direction.
Dependencies are inferred from the claim text.