Patent ID: 8745979

Claim:
An exhaust aftertreatment system comprising: an exhaust conduit carrying exhaust to an aftertreatment element treating said exhaust, said conduit comprising: an L-shaped bend having a first leg and a second leg meeting at an L-shaped junction, said second leg extending axially along an axis along an axial direction and directing exhaust to said aftertreatment element, said first leg extending laterally along a lateral direction relative to said axis and directing exhaust to said second leg, a flow distributor at said L-shaped junction and re-distributing exhaust to flow from said first leg to said second leg in an evenly distributed flow pattern to flow axially along said second leg to said aftertreatment element, said flow distributor is a perforated member having a variable perforation pattern, an inlet end receiving exhaust flowing laterally thereinto, and a distal end laterally distally oppositely spaced from said inlet end, said variable perforation pattern varying from said inlet end to said distal end substantially perpendicular to said axial direction of said second leg and providing a diffuser outlet flow area which decreases as exhaust flows from said inlet end toward said distal end.