Vehicle exhaust gas treatment apparatus

摘要

A vehicle exhaust gas treatment apparatus includes a DPF with SCR coating. An inlet piping fluidly communicates with the DPF and is positioned generally parallel to the DPF. An outlet pipe fluidly communicates with the DPF and is positioned generally parallel to the DPF. The apparatus is arranged such that exhaust gas flows through the inlet pipe in a first direction from a first inlet pipe end to a second inlet pipe end. The exhaust gas flows through the DPF in a second direction, generally parallel to and opposite to the first direction. The gas flows through the outlet pipe generally in the first direction from a first outlet pipe end to a second outlet pipe end.

主权项

1. A vehicle exhaust gas treatment apparatus including:
a diesel particulate filter (DPF) with a selective catalytic reduction (SCR) coating, the DPF defining a first longitudinal axis; an inlet pipe in fluid communication with the DPF and being positioned generally parallel to the DPF, the inlet pipe comprising a single inlet pipe defining a second longitudinal axis; an inlet configured to receive exhaust gases from an upstream exhaust component and direct the exhaust gases into the single inlet pipe via an inlet transition pipe portion fluidly connecting the inlet to the inlet pipe, wherein the inlet and inlet pipe are non-coaxial; an outlet pipe in fluid communication with the DPF and being positioned generally parallel to the DPF, the outlet pipe defining a third longitudinal axis, and wherein at least one of the second and third longitudinal axes is non-coaxial with the first longitudinal axis, and wherein exhaust gas flows through the inlet pipe in a first direction from a first inlet pipe end to a second inlet pipe end, flows through the DPF in a second direction, generally parallel to and opposite to the first direction, and then flows through the outlet pipe generally in the first direction from a first outlet pipe end to a second outlet pipe end; and an outlet configured to receive exhaust gas from the outlet pipe via an outlet transition pipe portion that is spaced from the inlet transition pipe portion, and wherein the inlet transition pipe portion and outlet transition pipe portion are arranged such that exhaust gas cannot flow directly from the inlet to the outlet without passing through the DPF.