Abstract: An exhaust system is provided for a diesel engine, including an exhaust passage adapted to be attached to the diesel engine. A diesel oxidation catalyst is provided in the exhaust passage along with a selective catalyst reduction device disposed downstream from the diesel oxidation catalyst. A diesel exhaust fluid mixing system includes a diesel exhaust fluid injection nozzle and a mixing device defining a single inlet opening and a single outlet opening connected to one another by a partial spiral flow passage. The diesel exhaust fluid injection nozzle injects diesel exhaust fluid directly into the inlet opening of the partial spiral flow passage.

Abstract: In one exemplary embodiment of the invention, a method of regenerating an exhaust gas particulate filter in a vehicle having an internal combustion engine is provided. The method includes determining a soot accumulation in the particulate filter, determining a soot humidity and temperature correction factor, and adjusting, using the soot humidity and temperature correction factor, the soot accumulation to determine a corrected soot accumulation in the particulate filter. The method further includes performing a regeneration of the particulate filter when at least one of the following occurs: the corrected soot accumulation reaches a predetermined threshold, and the corrected soot accumulation indicates a contorted soot mass to flow resistance relationship.

Abstract: A mixer for an exhaust gas treatment system includes a support body that defines a mixing chamber. A plurality of first blades is arranged in a row, and is disposed along a transverse axis. Each of the first blades extends from an upstream edge, toward a first lateral edge surface of the mixing chamber, to a downstream edge, at a first row angle relative to the transverse axis. A plurality of second blades is arranged in a row, and is disposed along the transverse axis. Each of the second blades extends from an upstream edge, toward a second lateral edge surface of the mixing chamber, to a downstream edge, at a second row angle relative to the transverse axis. The first row angle is less than the second row angle. The row of the first blades is axially spaced from the row of the second blades.

Abstract: In one aspect, a swirl can mixer assembly for mixing a fluid with exhaust gas exhausted from an internal combustion engine is provided. The assembly includes an inlet portion including an injection area configured to receive a fluid injector for dispensing the fluid into the exhaust gas for mixing with the exhaust gas in the mixing assembly to produce an exhaust gas/fluid mixture, an outlet portion, and an extended mixing conduit fluidly coupled between the inlet portion and the outlet portion. The extended mixing conduit is curved about at least a portion of a circumference of the outlet portion to induce a swirl in the exhaust gas/fluid mixture such that the exhaust gas/fluid mixture enters the outlet portion tangentially thereto.

Abstract: A system and method is provided for enhancing the performance of an SCR device, particularly by routinely reducing the amount of reductant deposits accumulated in an exhaust gas system, when the reductant is injected at a reduced temperature. The system may include an engine, an exhaust gas system, an SCR device, an injection device, and a controller configured to execute the present method. The controller may be configured to select an initial injection rate and an initial injection temperature for the reductant; estimate the amount of accumulated reductant deposits present within the exhaust gas system; compare the amount of accumulated reductant deposits to a threshold amount of reductant deposits allowable in the exhaust gas system; and initiate a reductant deposit burn-off mode when the amount of accumulated reductant deposits is greater than the threshold amount of reductant deposits allowable in the exhaust gas system.

Abstract: In one exemplary embodiment of the invention, a method of regenerating an exhaust gas particulate filter in a vehicle having an internal combustion engine is provided. The method includes determining a soot accumulation in the particulate filter, determining a soot humidity and temperature correction factor, and adjusting, using the soot humidity and temperature correction factor, the soot accumulation to determine a corrected soot accumulation in the particulate filter. The method further includes performing a regeneration of the particulate filter when at least one of the following occurs: the corrected soot accumulation reaches a predetermined threshold, and the corrected soot accumulation indicates a contorted soot mass to flow resistance relationship.

Abstract: A method is disclosed of providing a fuel efficient regeneration of an exhaust after-treatment (AT) system that includes a lean oxides of nitrogen (NOX) trap (LNT) and a selective catalytic reduction filter (SCRF) positioned downstream of the LNT. The method includes regulating a selectable position valve. The valve permits a first gas flow portion to pass through the LNT and diverts a remaining second portion of exhaust gas flow from a first passage connecting an engine and the AT system to a second exhaust passage to thereby bypass the LNT. The method also includes regulating a first device to inject fuel into the first portion of the exhaust gas flow. The injection of fuel in to the first portion of the exhaust gas flow provides fuel efficient regeneration of the LNT and promotes NOX conversion and ammonia (NH3) formation in the LNT. A system employing the method is also disclosed.

Abstract: A method for estimating the amount of soot accumulated in a particulate filter of a vehicle exhaust gas system is provided. The system may include an engine, an exhaust gas system, having a particulate filter, and a controller configured to execute the present method. The controller may be configured to evaluate an instantaneous volumetric flow rate of an exhaust gas flowing through the exhaust gas system; monitor an exhaust gas pressure drop across the particulate filter; determine a drive state of the vehicle based on the instantaneous volumetric flow rate of exhaust gas and the exhaust gas pressure drop; and execute one of a first control action when the drive state is a steady-state drive state and a second control action when the drive state is a transient-state drive state.

Abstract: A system and method is provided for enhancing the performance of an SCR device, particularly by routinely reducing the amount of reductant deposits accumulated in an exhaust gas system, when the reductant is injected at a reduced temperature. The system may include an engine, an exhaust gas system, an SCR device, an injection device, and a controller configured to execute the present method. The controller may be configured to select an initial injection rate and an initial injection temperature for the reductant; estimate the amount of accumulated reductant deposits present within the exhaust gas system; compare the amount of accumulated reductant deposits to a threshold amount of reductant deposits allowable in the exhaust gas system; and initiate a reductant deposit burn-off mode when the amount of accumulated reductant deposits is greater than the threshold amount of reductant deposits allowable in the exhaust gas system.

Abstract: An exhaust gas treatment system to treat exhaust gas includes a particulate filter, a second temperature sensor and a control module. The particulate filter includes a PF substrate configured to trap particulate matter contained in the exhaust gas. The second temperature sensor is configured to output an outlet temperature signal indicating an outlet temperature at the outlet of the particulate filter. The control module is in electrical communication with the second temperature sensor to receive the outlet temperature signal. The control module determines a maximum substrate temperature of the PF substrate based on the outlet temperature. The control module is further configured to determine whether the particulate filter includes an active washcoat disposed thereon based on the maximum substrate temperature.

Abstract: A method and control apparatus is disclosed for operating an internal combustion engine equipped with an after-treatment system including a catalyst. The control is configured to: perform a DeNOx regeneration event; monitor a parameter (1up) representative of an air-to-fuel ratio upstream of the catalyst and a parameter (1down) representative of an air-to-fuel ratio downstream of the catalyst; and perform a dedicated operating phase of the internal combustion engine to achieve an increase of the NOx emissions, if the value of the parameter (1down) representative of an air-to-fuel ratio downstream of the catalyst is lower than the value of the parameter (1up) representative of an air-to-fuel ratio upstream of the catalyst.

Abstract: An exhaust gas treatment system for a diesel engine is disclosed. The exhaust gas treatment system includes a hydrocarbon selective catalytic reduction catalyst (HC-SCR) in fluid communication with a diesel engine to receive an exhaust gas flow therefrom. The system also includes a two-way catalyst in fluid communication with the HC-SCR to receive the exhaust gas flow therefrom, the two-way catalyst comprising a urea selective catalytic reduction catalyst and a diesel particulate filter (DPF).

Abstract: An assembly for mixing liquid within a gas flow includes a hollow conduit that is configured for containing a flow of gas and liquid droplets. The assembly also includes multiple spaced blades and an impingement element. Each of the blades is operatively connected to and extends from the impingement element and is connected to an inner wall of the conduit. The impingement element is upstream of the blades in the flow of gas. The impingement element and the blades are configured to create a preferred distribution of the liquid droplets within the gas flow downstream of the blades within the conduit.

Abstract: An exhaust gas treatment system includes a SCR device and a DOC converter disposed upstream of the SCR device. A DEF dosing system includes an injector disposed upstream of the DOC converter for injecting ammonia reductant into the flow of exhaust gas upstream of the DOC converter. The DOC converter includes a corrugated metallic substrate having an ammonia-neutral oxidation catalyst compound that is operable to oxidize hydrocarbons and carbon monoxide in the flow of exhaust gas, while not reacting with the ammonia reductant in the flow of exhaust gas. The ammonia-neutral oxidation catalyst compound allows the ammonia reductant in the flow of exhaust gas to pass through the DOC converter, for reaction with a selective catalytic reduction composition in the SCR device.

Abstract: An exhaust gas treatment system for an internal combustion engine comprises an exhaust gas conduit in fluid communication with the internal combustion engine to conduct the exhaust gas between a plurality of exhaust treatment devices. A hydrocarbon injector in fluid communication with the exhaust gas delivers hydrocarbon thereto. A selective catalyst reduction device is disposed downstream of the hydrocarbon injector and is configured to receive and mix the hydrocarbon and exhaust gas and to reduce components of NOx therein. An oxidation catalyst device is disposed in fluid communication with the exhaust gas conduit downstream of the selective catalyst reduction device and is configured to oxidize exhaust gas and hydrocarbon mixture to raise the temperature of the exhaust gas. A particulate filter assembly is located downstream of the oxidation catalyst device for receipt of the heated exhaust gas, and combustion of carbon and particulates collected in the exhaust gas filter.

Abstract: An exhaust gas treatment system for a diesel engine is disclosed. The exhaust gas treatment system includes a lean NOX trap (LNT) in fluid communication with a diesel engine to receive an exhaust gas flow therefrom. The system also includes a two-way catalyst in fluid communication with the LNT to receive the exhaust gas flow therefrom, the two-way catalyst comprising a urea selective catalytic reduction catalyst and a diesel particulate filter (DPF).

Abstract: The present invention provides an exhaust cooler mounted to a tailpipe for receiving exhaust gas. The exhaust cooler includes a jet pump connectable to the tailpipe and a nozzle connectable to the tailpipe. The nozzle defines a nozzle opening between the tailpipe and the jet pump for communicating the exhaust gas from the tailpipe to the jet pump. A first throttle member is included that is moveable between a closed position and an open position, the open position defining a first opening between the tailpipe and the jet pump for communicating the exhaust gas from the tailpipe to the jet pump.

Abstract: The present invention is directed towards methods and systems for treatment of exhaust gas from an engine. In one embodiment, an exhaust gas treatment system for a diesel engine includes a four-way catalyst in fluid communication with a diesel engine to receive an exhaust gas flow therefrom, the four-way catalyst comprising a lean nitrogen oxides (NOX) trap and a diesel particulate filter (DPF). The system also includes a urea selective catalytic reduction (U-SCR) catalyst in fluid communication with the four-way catalyst to receive the exhaust gas flow therefrom.

Abstract: The present invention is directed towards methods and systems for treatment of exhaust gas from an engine. In one embodiment, an exhaust gas treatment system for a diesel engine is provided. The system includes a urea selective catalytic reduction (U-SCR) catalyst in fluid communication with a diesel engine to receive an exhaust gas flow therefrom. The system also includes a four-way catalyst in fluid communication with the U-SCR catalyst to receive the exhaust gas flow therefrom, the four-way catalyst comprising a lean nitrogen oxide (NOX) trap (LNT) and diesel particulate filter (DPF).

Abstract: An exhaust gas treatment system for an internal combustion engine is provided and includes an exhaust gas conduit, a hydrocarbon supply, a particulate filter (“PF”), at least one sensor, a first temperature sensor, a second temperature sensor, and a control module. The PF is in fluid communication with the exhaust gas conduit and has a filter structure for removal of particulates in the exhaust gas. The filter structure has an innermost region and an outermost region. The PF is selectively regenerated during operation of the internal combustion engine. The PF has a stratified temperature structure that causes the particulates trapped at the innermost region of the PF burn off before the particulates trapped in the outermost region of the PF during regeneration. The control module has a memory with an infinite stage temperature control curve stored thereon.