Patent ID: 9732687
Date: 2017-08-15
CPC Classifications: B01D,F01N,F02D,Y02C

Claim:
1. A method comprising: supplying a combustion source with air and fuel at an air to fuel mass ratio that can be selectively varied to produce a lean mixture of air and fuel, in which the air to fuel mass ratio is above stoichiometry, and a rich mixture of air and fuel, in which the air to fuel mass ratio is at or below stoichiometry, the combustion source being coupled to an exhaust aftertreatment system that comprises a NO combusting the lean mixture of air and fuel at the combustion source to produce an oxygen-rich exhaust flow that comprises nitrogen oxide gases (NO passing the oxygen-rich exhaust flow through the exhaust aftertreatment to (1) oxidize NO to NO combusting the rich mixture of air and fuel at the combustion source to produce an oxygen-depleted exhaust flow; and passing the oxygen-depleted exhaust flow through the exhaust aftertreatment system to (1) release NO