Abstract:
A motor vehicle exhaust line includes a hot pipe, and a cold pipe for exhaust gases. A mechanical decoupling element connects a downstream end of the hot pipe to an upstream end of the cold pipe. The exhaust line also includes a nitrogen oxide treatment device and an injector intended to reinject a reagent into, or to produce a reagent in the exhaust line upstream of the nitrogen oxide treatment device. The exhaust line includes a mixer intended to mix the exhaust gases and the reagent injected or produced by the injector. The mixer is positioned upstream of the nitrogen oxide treatment device. The nitrogen oxide treatment device is disposed in the cold pipe downstream of the mechanical decoupling element. The injector and the mixer form an assembly connected directly to the mechanical decoupling element.
Abstract:
The exhaust line for a heat engine comprises, between an exhaust inlet and an exhaust outlet, a nitrogen oxide trap which is fitted on a filtering portion. It comprises, between the nitrogen oxide trap and the exhaust inlet, a branching portion which is capable of branching the exhaust gases away from the nitrogen oxide trap and switching means for the exhaust gases in order to cause them to flow through the filtering portion or branching portion.
Abstract:
An exhaust line includes a duct having an injection segment with an inner channel defined by a side wall. The exhaust gas flow includes exhaust gas central streams in a central area of the inner channel and exhaust gas peripheral streams in the vicinity of the side wall. A reagent injector injects a reagent in an injection direction. The duct (3) is conformed so that the exhaust gas central streams flow substantially parallel to the central line of the inner channel. The exhaust line includes an element that imparts, to at least some peripheral streams, a rotary movement through the inner channel; and about a rotation axis that is slightly inclined relative to the injection direction.
Abstract:
The invention relates to an exhaust component in a gas exhaust line for gases produced by the combustion of a fuel in a heat engine. In the gas flow direction, there is a first connection to an upstream pipe carrying gases from the engine. There is also a first exhaust tube and a second exhaust tube, these two tubes being parallel and being connected to the first connection. There is a second connection to a downstream gas discharge pipe, connected to the parallel exhaust tubes. The component is characterized in that, firstly the first tube has a depolluting component, and the second tube has a silencer. The second connection is a three-way valve.
Abstract:
An exhaust line includes: a duct (3) including an injection segment (7) with an inner channel defined by a side wall, the exhaust gas flow including exhaust gas central streams in a central area of the inner channel (17) and exhaust gas peripheral streams in the vicinity of the side wall; a reagent injector (5) capable of injecting a reagent in an injection direction (F1). The duct (3) is conformed so that the exhaust gas central streams flow substantially parallel to the central line (L1) of the inner channel, the exhaust line (1) including an element (31) for imparting to at least some peripheral streams a rotary movement, through the inner channel, about a rotation axis that is slightly inclined relative to the injection direction (F1).
Abstract:
An exhaust line connected to the engine of an automobile, includes: a manifold (5) including at least one exhaust gas circulation channel (16) having an exhaust gas outlet (19), the manifold (5) including an outlet flange (13) through which the exhaust gas outlet (19) extends; a downstream apparatus (7) having an exhaust gas inlet (27) connected to the exhaust gas outlet (19) of the manifold (5), the downstream apparatus (7) being rigidly connected to the outlet flange (13) of the manifold (5). The engine (3) includes an engine block and a cylinder head (15), and the exhaust line (1) includes attachment elements (33) for attaching the outlet flange (13) of the manifold (5) directly to the engine block or the cylinder head (15).
Abstract:
A motor vehicle exhaust pipe includes: an outer metal tube; at least one inner tube made from an inorganic matrix composite material and disposed inside the outer metal tube, each inner tube being arranged longitudinally and having a pre-determined longitudinal length and a gap being provided between each inner tube and the outer tube; and elements for maintaining each inner tube in position in relation to the outer tube. The elements for maintaining each inner tube in position in relation to the outer tube include at least one retaining element disposed in the gap between the inner tube and the outer tube, each retaining element exerting a minimum pressure of between 10−4 MPa and 10−1 MPa on the inner tube. All of the elements used to maintain one inner tube in position have a cumulative longitudinal length equal to less than half of the longitudinal length of the inner tube.
Abstract:
A motor vehicle exhaust line silencer includes: an upper shell (2) having a substantially flat upper end wall (16); and a lower shell (4) having a substantially flat lower end wall (24) parallel to the upper end wall (16), the upper and lower shells (2, 4) delimiting between them an internal volume (6) of the silencer (1). The silencer (1) includes at least an internal partition wall (12) substantially parallel to the upper (16) and lower (24) end walls and arranged in the internal volume (6), the upper (16) and lower (24) end walls having respective reliefs (48, 50, 52) projecting into the internal volume (6) and cooperating to immobilise the internal partition wall (12).
Abstract:
A device for removing pollutants from exhaust gases of a combustion engine, includes a longitudinal outer casing (23) defining a passage through which the exhaust gases flow, and first and second pollution-removal members (18, 20) mounted in series in the passage. The device includes a holding sleeve (38) holding the first pollution-removal member (18) in place and interposed between the first pollution-removal member (18) and the outer casing (23) and running longitudinally at least over most of the length of the first pollution-removal member (18), the holding sleeve (38) being guided in the external casing (23) and forming, between the first and second pollution-removal members (18, 20) a longitudinal thrust surface (40) against which the first pollution-removal member (18) bears.
Abstract:
The invention relates to an exhaust line (10) for a heat engine, comprising a nitrogen oxide trap (28) which is installed on a filter section (24) between an exhaust inlet (12) and an exhaust outlet (14). The invention also comprises: a bypass section (26) which is disposed between the nitrogen oxide trap (28) and the exhaust inlet (12) in order to divert the exhaust gas away from the nitrogen oxide trap (28), and exhaust gas switching means (32, 24) which enable the gases to flow through the filter section (24) or the bypass section (26).