Exhaust system for a lean-burn ic engine
AssigneeJohnson Matthey Pubic Limited Company
InventorMartyn Twigg
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Abstract
An exhaust system for a lean-burn internal combustion engine comprises a filter (30, 36) for particulate matter and means (24) for generating an oxidant more active than molecular oxygen for combusting particulate matter disposed on the filter (30, 36), wherein the filter (30, 36) comprises a mass of elongate flat, narrow strip metal.
Claims21
An exhaust system for a lean-burn internal combustion engine comprising a soot filter packed with a mass of elongate, flat, narrow strip metal and a catalyst located upstream of the filter for oxidising NO to NO2 for combusting soot collected on the filter in NO2, wherein the catalyst is supported on a metal substrate of the type used in the filter having a lower packing density, to permit passage of soot particles.
Dependencies are inferred from the claim text.