Patent ID: 8393147
Filing Date: 2013-03-12
Classification: F01N

Abstract:
1. An aftertreatment module, comprising: a first chamber having an inlet disposed in a first surface of the first chamber; at least one catalyst substrate having an outer shell, the at least one catalyst substrate being disposed in the first chamber in a flow path through the inlet and having a flow direction from an inlet face to an outlet face in general alignment with the flow path; a second chamber having at least one outlet in general alignment with the flow direction through the inlet; and at least one noise attenuation passage fluidly connecting the first chamber with the second chamber, the at least one noise attenuation passage oriented generally orthogonal to the inlet and the at least one outlet and located outside of the outer shell, a distance from the at least one noise attenuation passage to the first surface being less than a distance from the outlet face of the at least one catalyst substrate to the first surface.