Importance

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Abstract

An exhaust system for an internal combustion engine, the system having a particulate trap for trapping particulate emissions. A catalyst is incorporated and exposed to the exhaust gas flow to promote burning off the trap particulate material. The catalyst is incorporated as a solid material insert which is fitted in the exhaust gas system upstream of the particulate trap so that the hot exhaust gases pass over the insert on their way to the trap. In passing over the insert, the hot exhaust gases cause catalytic material to be vaporized from the surface of the insert and to be carried along in a gas stream towards the trap where they assist in promoting burning of the particulates. The solid material is comprised of catalytic substance and other materials which are effective to determine the overall thermal conductivity of the body, the other materials may be selected from the group consisting of ceramic, sintered metallic material having porosity to promote a low thermoconductivity, or nonmetallic high temperature organic thermosetting resin.

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First Claim