Cummins Emission Solutions Inc.

Cummins Inc.

Shirish S Punde

Rayomand Dabhoiwala

James Nicholas Reynolds

Michael Haas

Michael J Ruth

Arvind V Harinath

Changsheng C Su

Krishna Pradeep Chilumukuru

Bryon D Staebler

Neal W Wallace

Rohan A Siddhanthi

James Zokoe, Jr

Aravindh K Kanakamedala

An aftertreatment system for treating exhaust gas includes: an exhaust conduit configured to receive the exhaust gas; a preheating oxidation catalyst disposed in the exhaust conduit; a primary oxidation catalyst disposed in the exhaust conduit downstream of the preheating oxidation catalyst; a selective catalytic reduction system disposed in the exhaust conduit downstream of the primary oxidation catalyst; and a controller configured to: determine a temperature of the exhaust gas at an inlet of the selective catalytic reduction system, and in response to the temperature of the exhaust gas at the inlet of the selective catalytic reduction system being below a threshold temperature, cause hydrocarbons to be provided to the preheating oxidation catalyst or to the exhaust conduit at a location upstream of the preheating oxidation catalyst. The preheating oxidation catalyst catalyzes combustion of the hydrocarbons so as to increase the temperature of the exhaust gas to above the threshold temperature.

Aftertreatment system including preheating oxidation catalyst

An aftertreatment system includes a particulate filter configured to receive exhaust gas from an engine and a controller that measures an actual pressure drop across the particulate filter, determines an expected total ash accumulation rate in the particulate filter based on a current duty cycle of the engine, determines an expected pressure drop across the particulate filter based on the expected total ash accumulation rate, compares the expected pressure drop with the actual pressure drop, and determines whether an oil consumption rate in the engine is abnormal based on the comparison.

Engine health and oil consumption rate diagnostic using back pressure

A system includes: an engine; and an aftertreatment system for treating exhaust gas produced by the engine, the aftertreatment system including: an exhaust conduit configured to receive the exhaust gas and hydrocarbons from the engine; a preheating oxidation catalyst; a primary oxidation catalyst disposed downstream of the preheating oxidation catalyst; a selective catalytic reduction system disposed in the exhaust conduit downstream of the primary oxidation catalyst. The aftertreatment system includes: a controller configured to: determine a temperature of the exhaust gas at an inlet of the selective catalytic reduction system, and in response to the temperature of the exhaust gas at the inlet of the selective catalytic reduction system being below a threshold temperature, cause the engine to provide the hydrocarbons to the exhaust conduit. The preheating oxidation catalyst is configured to catalyze combustion of the hydrocarbons so as to increase the temperature of the exhaust gas to above the threshold temperature.

Aftertreatment system including preheating oxidation and catalyst

An aftertreatment system for treating an exhaust gas comprises an exhaust conduit, a preheating oxidation catalyst, a primary oxidation catalyst disposed downstream of the preheating oxidation catalyst, and a selective catalytic reduction system disposed in the exhaust conduit downstream of the primary oxidation catalyst. A controller is configured to determine a temperature of an exhaust gas at an inlet of the selective catalytic reduction system. In response to the temperature being below a threshold temperature, the controller generates a hydrocarbon insertion signal configured to cause hydrocarbons to be inserted into or upstream of the preheating oxidation catalyst so as to increase a temperature of the exhaust gas to above the threshold temperature.

An exhaust gas aftertreatment system for an internal combustion engine includes an inlet conduit, a reductant decomposition chamber, a first selective catalytic reduction (SCR) catalyst member, a second SCR catalyst member, a mixing chamber, a particulate filter, a reductant delivery system, and a hydrocarbon delivery system. The inlet conduit is configured to receive exhaust gas from the internal combustion engine. The reductant decomposition chamber is fluidly coupled to the inlet conduit and configured to receive the exhaust gas from the inlet conduit. The first SCR catalyst member is fluidly coupled to the reductant decomposition chamber and configured to receive the exhaust gas from the reductant decomposition chamber. The second SCR catalyst member is fluidly coupled to the first SCR catalyst member and is configured to receive the exhaust gas from the first SCR catalyst member.

Exhaust gas aftertreatment system with a selective catalytic reduction catalyst member upstream of a particulate filter

An oxidation catalyst may include hydrocarbon storage material. One implementation relates to a diesel oxidation catalyst that includes a catalyst having a front zone and a rear zone and a gradient of hydrocarbon storage material on the catalyst extending from the front zone to the rear zone. The gradient of hydrocarbon storage material, may comprise a linear gradient, a step gradient, a parabolic gradient, a logarithmic gradient, or other forms thereof.

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Columbus, IN, United States of America

Shirish S Punde