Abstract: A system, method, and software for determining an amount of reductant to be supplied to a NOx adsorber during a regeneration event is disclosed. A reductant calculation module is executable by an electronic control unit for calculating a quantity of reductant delivered which is required to periodically regenerate the adsorber by accumulating the reductant fuel delivered as a function of a total fuel quantity being supplied to the internal combustion engine by a fuel system and subtracting an amount of fuel required to achieve a stoichiometric air to fuel ratio at an inlet of the adsorber.

Abstract: A system, method, and software that rapidly heats a diesel oxidation catalyst unit to an effective operating temperature at engine startup is disclosed. Upon ignition of an engine an electronic control unit is operable to lower a fresh air flow target value to a reduced fresh air flow target value as well as lower a valve opening limit of an exhaust gas recirculation valve to a reduced valve opening limit. The electronic control unit monitors a temperature value of a flow of exhaust entering the diesel oxidation catalyst unit until the temperature value reaches a first predetermined threshold value. After reaching the first predetermined threshold value, the electronic control unit causes the fuel system to set post-injection fueling to a predetermined post-injection fueling value until the temperature value of the flow of exhaust entering the diesel oxidation catalyst unit reaches a second predetermined threshold value.

Abstract: A system and method are provided for controlling regeneration of exhaust gas aftertreatment components coupled to an internal combustion engine. For example, the particulate load of a particulate filter is monitored and a road speed of the vehicle is determined. If the particulate load is greater than a particulate load threshold and the road speed is greater than a road speed threshold, regeneration of the particulate filter is initiated. As another example, the sulfur oxide load (SOx) of a NOx catalyst is also monitored, and if the SOx load is greater than a SOx threshold while the particulate filter is being regenerated, regeneration of the particulate filter is terminated and SOx regeneration of the NOx catalyst is initiated.

Abstract: A NOx adsorber catalyst may comprise a housing defining an inlet configured to receive exhaust gas produced by an internal combustion engine, an outlet and a chamber between the inlet and the outlet. A NOx adsorber element may be positioned in the chamber adjacent to the inlet. The NOx adsorber element may be configured to trap NOx in the exhaust gas during lean fuel operation of the engine, and to release the trapped NOx and reduce the released NOx to nitrogen during rich fuel operation of the engine. A hydrocarbon trap may be positioned in the chamber between the NOx adsorber element and the outlet. The hydrocarbon trap may be configured to trap hydrocarbons that travel through the NOx adsorber element during the rich fuel operation of the engine. The trapped hydrocarbons may be oxidized by oxygen present in the exhaust gas during lean fuel operation following rich fuel operation.

Abstract: A NOx adsorber catalyst may comprise a housing defining an inlet configured to receive exhaust gas produced by an internal combustion engine, an outlet and a chamber between the inlet and the outlet. A NOx adsorber element may be positioned in the chamber adjacent to the inlet. The NOx adsorber element may be configured to trap NOx in the exhaust gas during lean fuel operation of the engine, and to release the trapped NOx and reduce the released NOx to nitrogen during rich fuel operation of the engine. A hydrocarbon trap may be positioned in the chamber between the NOx adsorber element and the outlet. The hydrocarbon trap may be configured to trap hydrocarbons that travel through the NOx adsorber element during the rich fuel operation of the engine. The trapped hydrocarbons may be oxidized by oxygen present in the exhaust gas during lean fuel operation following rich fuel operation.

Abstract: A system and method are provided for controlling regeneration of exhaust gas aftertreatment components coupled to an internal combustion engine. For example, the particulate load of a particulate filter is monitored and a road speed of the vehicle is determined. If the particulate load is greater than a particulate load threshold and the road speed is greater than a road speed threshold, regeneration of the particulate filter is initiated. As another example, the sulfur oxide load (SOx) of a NOx catalyst is also monitored, and if the SOx load is greater than a SOx threshold while the particulate filter is being regenerated, regeneration of the particulate filter is terminated and SOx regeneration of the NOx catalyst is initiated.

Abstract: A system, method, and software for determining an amount of reductant to be supplied to a NOx adsorber during a regeneration event is disclosed. A reductant calculation module is executable by an electronic control unit for calculating a quantity of reductant delivered which is required to periodically regenerate the adsorber by accumulating the reductant fuel delivered as a function of a total fuel quantity being supplied to the internal combustion engine by a fuel system and subtracting an amount of fuel required to achieve a stoichiometric air to fuel ratio at an inlet of the adsorber.

Abstract: A system, method, and software that rapidly heats a diesel oxidation catalyst unit to an effective operating temperature at engine startup is disclosed. Upon ignition of an engine an electronic control unit is operable to lower a fresh air flow target value to a reduced fresh air flow target value as well as lower a valve opening limit of an exhaust gas recirculation valve to a reduced valve opening limit. The electronic control unit monitors a temperature value of a flow of exhaust entering the diesel oxidation catalyst unit until the temperature value reaches a first predetermined threshold value. After reaching the first predetermined threshold value, the electronic control unit causes the fuel system to set post-injection fueling to a predetermined post-injection fueling value until the temperature value of the flow of exhaust entering the diesel oxidation catalyst unit reaches a second predetermined threshold value.