Patent ID: 7392652

Claim:
Apparatus comprising: a particulate trap for removing matter from exhaust streams; a diesel engine connected to discharge a primary exhaust stream into the particulate trap; an auxiliary diesel engine operating from a common fuel as the diesel engine connected to discharge a secondary exhaust stream into the particulate trap; engine sensors for the diesel engine and the auxiliary diesel engine; means for determining occasions of excess buildup of particulate matter in the particulate trap; and a controller responsive to an indication generated by the means for determining of excessive build up of matter in the particulate trap for initiating concurrent operation of the diesel engine and auxiliary diesel engine and further responsive to the engine sensors for varying inputs of fuel and air into the diesel engine and the auxiliary diesel engine during concurrent operation including setting the ratio of fuel and air in stoichiometric balance for normal engine operation for both the diesel and the auxiliary diesel engine and further including setting the fuel and air ratio for the auxiliary diesel engine out of stoichiometric balance to introduce a combustion by-product fuel and sufficient thermal energy into the secondary exhaust stream to initiate combustion in the particulate trap while concurrently keeping the relative inputs of fuel and air into the diesel engine at a ratio maintaining a sufficient quantity of oxygen in the primary exhaust stream into the particulate trap to support initiation of combustion for regeneration of the particulate trap.