Abstract: Example methods and systems for treating exhaust from an internal combustion engine may generally determine a catalytic converter in an exhaust system is at least partially deactivated by detecting an elevated exhaust temperature and a lean-burn operating condition. In response, a deactivation level of the catalytic converter may be determined, which may be compared with a threshold deactivation level. A magnitude of a temporary rich-fuel operating condition as a response may be determined based upon the comparison. The catalytic converter may be reactivated with the temporary rich-fuel operating condition.

Abstract: Example methods and systems for treating exhaust from an internal combustion engine may generally determine a catalytic converter in an exhaust system is at least partially deactivated by detecting an elevated exhaust temperature and a lean-burn operating condition. In response, a deactivation level of the catalytic converter may be determined, which may be compared with a threshold deactivation level. A magnitude of a temporary rich-fuel operating condition as a response may be determined based upon the comparison. The catalytic converter may be reactivated with the temporary rich-fuel operating condition.

Abstract: An aftertreatment system includes a first pipe section in fluid communication with an exhaust manifold on an internal combustion engine. A first aftertreatment device includes a housing and a porous substrate having substrate walls defining a plurality of flow channels including first channels obstructed at a first end of the substrate and second channels obstructed at a second end of the substrate opposite the first end. The first and second channels are interleaved and internal pore surfaces in the porous substrate form a plurality of internal pores. A passive NOx adsorption catalyst is deposited on the substrate walls and internal pore surfaces such that the mean porosity of the porous substrate is not greater than a particulate matter secondary grain size. A second aftertreatment device having an inlet is in fluid communication with the outlet of the first aftertreatment device.

Abstract: A method of controlling a particulate filter of an internal combustion engine is disclosed. A regeneration cycle of the particulate filter is initiated. During the regeneration, a value of an exhaust gas temperature at an outlet of the particulate filter is determined and a value of a residual soot quantity stored into the particulate filter is estimated on the basis of the measured value of the exhaust gas temperature at the outlet of the particulate filter. The regeneration cycle may be started and stopped based on the estimated residual soot quantity.

Abstract: An exhaust system directs flow of an exhaust gas from an internal combustion engine. The exhaust system includes an exhaust pipe, a first exhaust treatment device configured to introduce a first substance into the exhaust pipe and a second exhaust treatment device configured to introduce a second substance into the exhaust pipe. A switch is operably connected to the first and second exhaust treatment devices and is positionable in a first position and a second position. An injector is operably connected to the switch and the exhaust pipe. With the switch in the first position, the injector is configured to inject the first substance into the exhaust pipe. With the switch in the second position, the injector is configured to inject the second substance into the exhaust pipe.

Abstract: Exhaust gas systems and method for controlling the same are provided. Systems include a hydrolysis catalyst device (HCD) in fluid communication with an exhaust gas conduit, a turbocharger turbine disposed downstream from the HCD and in fluid communication therewith via the conduit, a selective catalytic reduction device (SCR) disposed downstream from the turbine and in fluid communication therewith via the conduit; and a reductant injector configured to inject reductant into the conduit upstream from the HCD. The HCD can comprise TiO2, V2O5, A12O3, and SiO2. Methods can include injecting reductant upstream from turbine, such as while the SCR is below a NOx light-off temperature and/or a reductant decomposition temperature. The system can further include a second reductant injector configured to inject reductant into the conduit at a second injection location downstream from the turbine and upstream from the SCR, and the method can include injecting reductant via the second injector.

Abstract: A method and apparatus for cleaning up a particulate filter of an internal combustion engine is provided. The internal combustion engine is operated to regenerate the particulate filter measuring. During the regeneration, a value of an engine speed is determined. A temperature of the particulate filter is controlled, if the measured value of the engine speed is smaller than or equal to a predetermined threshold value thereof. The particulate filter temperature is controlled by boosting the internal combustion engine and supplying the internal combustion engine with an amount of recirculated exhaust gases.

Abstract: Methods for evaluating a soot quantity accumulated in a selective catalytic reduction wash-coated particulate filter (SCRF) of an exhaust gas treatment system are provided, and include injecting reductant proximate the SCRF, determining one or more mapping values, computing a correction value of a soot quantity using a map correlating the one or more mapping values, detecting an apparent soot burning operating temperature, and correcting an estimated value of the soot quantity using the correction value in order to obtain an evaluated value of the soot quantity. The one or more mapping values can include a reductant injection quantity value, a NOx quantity value, a temperature value, and a mass flow value of an exhaust gas. The apparent soot burning operating temperature can comprise a temperature at which a ?P across the SCRF improperly implies an actual soot burning. Further provided are apparatuses for performing the disclosed methods.

Abstract: A method of operating a fuel injector of an internal combustion engine having a reciprocating piston includes performing a multi after-injection pattern having at least one pair of consecutive injection pulses both starting after a top dead center of the piston and separated by a dwell time shorter than 200 as.

Abstract: An exhaust system directs flow of an exhaust gas from an internal combustion engine. The exhaust system includes an exhaust pipe, a first exhaust treatment device configured to introduce a first substance into the exhaust pipe and a second exhaust treatment device configured to introduce a second substance into the exhaust pipe. A switch is operably connected to the first and second exhaust treatment devices and is positionable in a first position and a second position. An injector is operably connected to the switch and the exhaust pipe. With the switch in the first position, the injector is configured to inject the first substance into the exhaust pipe. With the switch in the second position, the injector is configured to inject the second substance into the exhaust pipe.

Abstract: An exhaust system for an internal combustion engine for a vehicle includes a turbine positioned in an exhaust stream from the internal combustion engine, a first diesel oxidation catalyst positioned upstream of the turbine within the exhaust stream, and a bypass for selectively bypassing the exhaust stream around the diesel oxidation catalyst to the turbine.

Abstract: An exhaust system for an internal combustion engine for a vehicle includes a turbine positioned in an exhaust stream from the internal combustion engine, a first diesel oxidation catalyst positioned upstream of the turbine within the exhaust stream, and a bypass for selectively bypassing the exhaust stream around the diesel oxidation catalyst to the turbine.

Abstract: A method is disclosed for evaluating a soot quantity accumulated in a Selective Catalytic Reduction wash-coated particulate filter of an internal combustion engine. The internal combustion engine is equipped with an exhaust gas aftertreatment system including an urea injector. Using a map correlating a urea quantity value, a NOx quantity value, a temperature value and a mass flow value to a correction value of a soot quantity is used to correct an estimated value of the soot quantity in order to obtain an evaluated value of the soot quantity.

Abstract: Methods for evaluating a soot quantity accumulated in a selective catalytic reduction wash-coated particulate filter (SCRF) of an exhaust gas treatment system are provided, and include injecting reductant proximate the SCRF, determining one or more mapping values, computing a correction value of a soot quantity using a map correlating the one or more mapping values, detecting an apparent soot burning operating temperature, and correcting an estimated value of the soot quantity using the correction value in order to obtain an evaluated value of the soot quantity. The one or more mapping values can include a reductant injection quantity value, a NOx quantity value, a temperature value, and a mass flow value of an exhaust gas. The apparent soot burning operating temperature can comprise a temperature at which a ?P across the SCRF improperly implies an actual soot burning. Further provided are apparatuses for performing the disclosed methods.

Abstract: A method of operating a fuel injector of an internal combustion engine having a reciprocating piston includes performing a multi after-injection pattern having at least one pair of consecutive injection pulses both starting after a top dead center of the piston and separated by a dwell time shorter than 200 as.

Abstract: A method and apparatus for cleaning up a particulate filter of an internal combustion engine is provided. The internal combustion engine is operated to regenerate the particulate filter measuring. During the regeneration, a value of an engine speed is determined. A temperature of the particulate filter is controlled, if the measured value of the engine speed is smaller than or equal to a predetermined threshold value thereof. The particulate filter temperature is controlled by boosting the internal combustion engine and supplying the internal combustion engine with an amount of recirculated exhaust gases.

Abstract: A method of controlling a particulate filter of an internal combustion engine is disclosed. A regeneration cycle of the particulate filter is initiated. During the regeneration, a value of an exhaust gas temperature at an outlet of the particulate filter is determined and a value of a residual soot quantity stored into the particulate filter is estimated on the basis of the measured value of the exhaust gas temperature at the outlet of the particulate filter. The regeneration cycle may be started and stopped based on the estimated residual soot quantity.

Abstract: A method is disclosed for evaluating a soot quantity accumulated in a Selective Catalytic Reduction wash-coated particulate filter of an internal combustion engine. The internal combustion engine is equipped with an exhaust gas aftertreatment system including an urea injector. Using a map correlating a urea quantity value, a NOx quantity value, a temperature value and a mass flow value to a correction value of a soot quantity is used to correct an estimated value of the soot quantity in order to obtain an evaluated value of the soot quantity.