Exhaust gas cleaning component with deflection surface, method for production thereof and motor vehicle having the component

1. A method for producing an exhaust gas cleaning component, the method comprising the following steps:

a) providing a carrier structure having an inflow side, an outflow side, a predefined through-flow direction, a return flow region disposed concentrically around the carrier structure and a deflection surface disposed opposite the outflow side;

b) subjecting the carrier structure to an exhaust gas flow from the inflow side to the outflow side in the predefined through-flow direction, and directing the flow to impinge obliquely, at least partially, on the inflow side of the carrier structure at an angle relative to the predefined through-flow direction;

c) determining a distribution of flow velocities on the outflow side of the carrier structure; and

d) configuring a shape of the deflection surface with at least one backpressure element in dependence on the distribution of the flow velocities on the outflow side:

to homogenize the distribution of the flow velocities,

to deflect the exhaust gas to the concentric return flow region, and

to provide a distance between the deflection surface and the outflow side of less than 30 mm in regions of elevated flow velocity.

2. The method according to claim 1 , which further comprises configuring the shape of the deflection surface zonally to be substantially mirror-inverted relative to a shape of the distribution of the flow velocities, in step d).

3. An exhaust gas cleaning component, comprising:

a carrier structure having an inflow side, an outflow side, a predefined through-flow direction, a return flow region disposed concentrically around said carrier structure and a deflection surface disposed opposite said outflow side and configured to deflect the exhaust gas to said concentric return flow region;

said deflection surface configured to cause an exhaust gas flow passing through the exhaust gas cleaning component, with said deflection surface disposed therein, to have a uniformity index greater than 0.8;

said deflection surface having at least one off-center multiple dent and said deflection surface disposed at a distance from said outflow side of less than 30 mm in the vicinity of said at least one dent; and

an inflow conduit having a main direction, said main direction and said predefined through-flow direction being disposed at an oblique angle relative to one another.

4. A motor vehicle, comprising:

an internal combustion engine; and

an exhaust system for cleaning exhaust gases of said internal combustion engine;

said exhaust system having an exhaust gas cleaning component according to claim 3 .

5. A motor vehicle, comprising:

an internal combustion engine; and

an exhaust system for cleaning exhaust gases of said internal combustion engine;

said exhaust system having an exhaust gas cleaning component produced according to claim 1 .

6. The method according to claim 1 , wherein the homogenized distribution of flow velocities has a uniformity index greater than 0.8.

7. The method according to claim 6 , wherein the uniformity index is determined by the following steps:

i) determining local flow velocities at a multiplicity of measuring points distributed uniformly over a cross-sectional area parallel to the outflow side of the exhaust gas cleaning component;

ii) calculating a mean flow velocity from the local flow velocities;

iii) calculating local non-uniformity indexes by standardization of deviations of the local flow velocities from the mean flow velocity;

iv) calculating a global non-uniformity index from the local non-uniformity indexes; and

v) calculating the uniformity index as a reversion of the global non-uniformity index.

8. The exhaust gas cleaning component according to claim 3 , wherein said uniformity index is determined by:

i) determining local flow velocities at a multiplicity of measuring points distributed uniformly over a cross-sectional area parallel to said outflow side of the exhaust gas cleaning component;

ii) calculating a mean flow velocity from said local flow velocities;

iii) calculating local non-uniformity indexes by standardization of deviations of said local flow velocities from said mean flow velocity;

iv) calculating a global non-uniformity index from said local non-uniformity indexes; and

v) calculating said uniformity index as a reversion of said global non-uniformity index.