Patent ID: 7243488

Claim:
A system for controlling temperature in a diesel particulate filter in an exhaust gas stream of a diesel engine during regeneration thereof by combustion of soot collected therein, said engine exhaust stream including oxygen, the system comprising: a) a fuel source for providing fuel to said exhaust gas stream ahead of said diesel particulates filter; and b) an air source for providing air to said exhaust stream ahead of said diesel particulates filter, wherein said exhaust gas stream upon leaving said diesel engine has a residual oxygen content greater than about 6%, wherein said fuel and said oxygen in said exhaust stream are combusted to reduce said residual oxygen content in said exhaust gas passing through said diesel particulate filter; and wherein said air from said air source is selectively passed through said diesel particulates filter to cool the combustion of soot in said diesel particulates filter when the diesel engine is in an idle mode or a low-demand mode.