Methods and systems for an engine emission control system

摘要

Systems and methods are provided for a layered emission control device coupled to an exhaust manifold. Various formulations may be incorporated in a plurality of layers of the device to enable various emission control functions to be grouped within spatial constraints. For example, a first layer may include a first, oxidizing catalyst, a second layer may include a HC trap, and a third layer may include a second, different oxidizing catalyst, the second layer positioned between the first and third layers. The layers may be organized to reduce functional interference and improve functional synergy between the various emission control functions.

主权项

1. A system, comprising:
a vehicle engine exhaust; and a layered emission control system coupled to a vehicle engine exhaust manifold, comprising a first, upper layer including a first, oxidizing catalyst, a second, intermediate layer including a HC trap for trapping exhaust HCs, and a third, lower layer including a second, different oxidizing catalyst, wherein the second layer is positioned between the first and third layers.