Abstract: A filter abnormality determination system includes: a PM sensor configured to introduce a part of exhaust gas flowing in the exhaust gas passage on the downstream side of a filter into a sensor body and to correlate a sensor output with an amount of particulate matter accumulated on a sensor element in the sensor body; an abnormality determining unit configured to perform filter abnormality determination on the basis of the output of the PM sensor; a determination timing determining unit configured to determine a timing at which the abnormality determining unit performs the abnormality determination on the basis of an estimated amount of particulate matter accumulated on the sensor element; and a determination performing adjusting unit configured to adjust the performing timing determined by the determination timing determining unit depending on a variation of an exhaust gas flow rate per unit time in the exhaust gas passage in which the PM sensor is disposed.

Abstract: An exhaust gas treatment device includes a housing having a wall. The wall of the housing defines an interior chamber. A substrate is supported by the housing within the interior chamber of the housing. The substrate extends along a longitudinal axis. The substrate includes a flow through structure that allows the flow of exhaust gas to flow through the substrate. The substrate includes a catalytic composition disposed thereon for reacting with the flow of exhaust gas. The substrate includes a cavity, extending along a cavity axis, which is transverse to the longitudinal axis of the substrate. A sensor is attached to the housing. The sensor includes a probe that at least partially extends into the cavity of the substrate, for sensing a gaseous component in the flow of exhaust gas. The cavity mixes the flow of exhaust gas and directs the exhaust gas toward the probe of the sensor.

Abstract: A deterioration diagnosis apparatus for an exhaust gas purification apparatus according to the invention performs an induction process when an internal combustion engine is operating at a lean air-fuel ratio, measures the air-fuel ratio of the exhaust gas flowing into the SCR catalyst and the air-fuel ratio of the exhaust gas flowing out of the SCR catalyst by the air-fuel ratio sensor during the period through which the induction process is performed, and diagnoses deterioration of the SCR catalyst based on the difference between the air-fuel ratios thus measured. The diagnosis apparatus adjusts the quantity of reducing agent supplied to a hydrogen production catalyst during the period through which the induction process is performed, taking account of the degree of deterioration of the hydrogen production catalyst.

Abstract: An exhaust aftertreatment system including a selective catalytic reduction device (SCR), a NOx sensor and a reductant injection system is described. A method for controlling the reductant injection system to inject reductant into the exhaust gas feedstream upstream relative to the SCR includes monitoring engine operation, and determining an initial reductant dosing rate responsive to the engine operation. A dosing perturbation is induced in the reductant dosing rate. The exhaust gas feedstream is monitored via the NOx sensor, and a reductant dosing correction term is determined based upon the monitoring. A final dosing rate for controlling the reductant injection system is determined based upon the initial reductant dosing rate, the dosing perturbation, and the reductant dosing correction term.

Abstract: Various methods and systems are provided for a variable geometry ported shroud for a turbocharger. In one example, a compressor system includes a compressor housing defining an air inlet, a shroud, and a bypass passage, a compressor wheel housed in the compressor housing and surrounded by the shroud, only a single port passing through the shroud and fluidically coupled to the bypass passage, and a ring configured to move axially to adjust a restriction of the port.

Abstract: A variable turbine geometry turbine turbocharger (1) includes vanes (30) configured to control flow of exhaust gas to a turbine wheel (12), and an adjustment ring (40) connected to each vane (30) that controls the angular orientation of all the vanes (30) in unison. The adjustment ring (40) is supported on the bearing housing (16) and is supported on, and piloted relative to, an axially extending nose portion (17) of the bearing housing (16) by surface features (60) formed along an inner edge (43) of the adjustment ring (40).

Abstract: A method and a control device for raising and/or lowering an exhaust gas temperature of a combustion engine having an exhaust gas aftertreatment device arranged in an exhaust line sets the exhaust gas temperature for the exhaust gas aftertreatment using an electric-motor mode and/or a generator mode of an electrified exhaust turbocharger.

Abstract: A dosing control system for an exhaust system of an engine includes: a tank containing a reductant solution having urea; an injector operable to inject the reductant solution into an exhaust flow upstream of an SCR apparatus; first and second NOx sensors disposed to sense NOx emissions in the exhaust flow upstream and downstream, respectively, of the SCR apparatus; and a control module. The control module is disposed in signal communication with the first and second NOx sensors and in operable communication with the injector, the control module being operable to set an original dosing level and decrease a dosing of the reductant solution injected by the injector based on a determination from signals received from the first and second NOx sensors that a reduction in a conversion efficiency of the SCR apparatus below a defined level of conversion efficiency has occurred.

Abstract: A system and method are disclosed for desulfating an oxidation catalyst in an aftertreatment system of a multifuel internal combustion engine. The oxidation catalyst can be desulfated in response to one or more desulfation triggering events. The desulfation process includes providing hydrocarbons from one or all of the multiple fuel sources to an upstream oxidation catalyst. The hydrocarbons react with the exhaust gas within the upstream oxidation catalyst to deplete oxygen in the exhaust flow to thereby reduce the desulfation temperature of the oxidation catalyst while elevating a temperature of the exhaust gas to a desulfation temperature range.

Abstract: In a multiple cylinder supercharged engine, when reduced cylinder operation is executed, a throttle, which is located downstream of a compressor driven by a turbine provided in an exhaust passage, through which exhaust gas of a cylinder group flows, is operated to a fully closed state, wherein the reduced cylinder operation is applied to the cylinder group. A fuel injection amount of at least one cylinder included in the cylinder group is made smaller than a fuel injection amount of a cylinder included in another cylinder group, and this at least one cylinder is operated, in order to increase rotational speed of the compressor, so that a value of pressure of an upstream side of the throttle is controlled to a value, which is equal to or larger than a value of pressure of a downstream side of the throttle.

Abstract: An internal combustion engine includes: plural cylinders, a first exhaust gas turbocharger having a high-pressure turbine and a high-pressure compressor, a second exhaust gas turbocharger having a low-pressure turbine and a low-pressure compressor, and an SCR catalytic converter positioned between the high-pressure turbine and the low-pressure turbine, via which exhaust gas leaving the high-pressure turbine is conducted upstream of the low-pressure turbine. The low-pressure compressor is assigned a power take-in, via which the low-pressure compressor can be driven when as a consequence of a relatively large exhaust gas temperature drop at the SCR catalytic converter via the low-pressure turbine an adequate amount of energy required to supply the cylinders of the internal combustion engine with a desired quantity of charge air can no longer be provided.

Abstract: A deterioration diagnosis apparatus for an exhaust gas purification apparatus according to the invention performs an induction process when an internal combustion engine is operating at a lean air-fuel ratio, measures the air-fuel ratio of the exhaust gas flowing into the SCR catalyst and the air-fuel ratio of the exhaust gas flowing out of the SCR catalyst by the air-fuel ratio sensor during the period through which the induction process is performed, and diagnoses deterioration of the SCR catalyst based on the difference between the air-fuel ratios thus measured. The diagnosis apparatus adjusts the quantity of reducing agent supplied to a hydrogen production catalyst during the period through which the induction process is performed, taking account of the degree of deterioration of the hydrogen production catalyst.

Abstract: An internal combustion engine includes an upstream side exhaust purification catalyst and a downstream side exhaust purification catalyst. The control device includes a storage amount estimating device which estimates the oxygen storage amount of the downstream side exhaust purification catalyst, and can execute fuel cut control which cuts the feed of fuel to the combustion chamber during operation of the internal combustion engine when the engine speed is the lowest reference speed or more. The control device lowers the lowest reference speed when the storage amount estimated by the storage amount estimating device has become a given limit storage amount or less, compared with when it is larger than the limit storage amount. As a result, a control device can effectively keep the oxygen storage amount of the downstream side exhaust purification catalyst from decreasing to zero.

Abstract: An apparatus and a method of purifying exhaust gas are provided. The apparatus for purifying exhaust gas may include: an exhaust pipe connected to an exhaust manifold of an engine; a catalytic converter mounted on the exhaust pipe and including a hydrocarbon trap and a three-way catalyst; an exhaust gas recirculation (EGR) pipe connecting downstream of the catalytic converter to an intake manifold of the engine; an EGR valve mounted on the EGR pipe; a first oxygen sensor mounted on the exhaust pipe downstream of the catalytic converter; a second oxygen sensor mounted on the exhaust pipe upstream of the catalytic converter; and a controller controlling an operation of the EGR valve.

Abstract: Turbo or super charged intake tract diverter valve system, upstream of a throttle valve, includes a closure means (10) for a diversion aperture (4.1) in the intake tract (3) to vent pressurized gases within to a bypass path or atmosphere; the closure means having a transfer aperture (12) facilitating a net force due to a pressure differential on its opposite sides of the closure means (10) so as to close or keep closed the diversion aperture (4.1). When gas pressure on opposite sides of the closure means is equal, and when an upstream side (10.1) of the closure means (10) has a pressure greater than a downstream side (5.1), then it will open the diversion aperture (4.1). An actuation means opens a control aperture (6) to create the necessary pressure differential on the closure means (10) to thereby cause same to open the diversion aperture (4.1).

Abstract: A turbo-compounding system may include a first turbine, a turbocharger, a bypass passageway and a valve. The first turbine may include an inlet in fluid communication with an exhaust manifold and an outlet in fluid communication with a fluid passageway. The first turbine may be drivingly coupled to an engine. The turbocharger includes a first compressor and a second turbine. The first compressor receives an intake fluid at a first pressure and discharges the intake fluid at a second pressure. The second turbine may drive the first compressor and receive exhaust gas from the fluid passageway downstream of the outlet of the first turbine. The bypass passageway may include a first end fluidly coupled with the engine exhaust manifold and a second end fluidly coupled with the fluid passageway downstream from the first turbine and upstream of the second turbine. The valve controls fluid-flow through the bypass passageway.

Abstract: An exhaust purification system of an internal combustion engine having an upstream side catalyst a downstream side catalyst, a downstream side air-fuel ratio sensor provided between the upstream side catalyst and the downstream side catalyst, and a control device able to control an air-fuel ratio of exhaust gas flowing into the upstream side catalyst as air-fuel ratio control.

Abstract: A method for injecting a reductant into an exhaust gas of a power system. The method includes oscillating injections of the reductant between a higher reductant injection rate and a lower reductant injection rate. The higher injection rate is high enough to result in storage of a decomposed form of the reductant on a selective catalytic reduction on-filter (“SCR+F”), and the lower injection rate being low enough to result in depletion of the decomposed form of the reductant on the SCR+F. The SCR+F includes a diesel particular filter and a selective catalytic reduction catalyst applied thereto.

Abstract: An exhaust gas line section, through which an exhaust gas can flow, includes a flow guiding structure, a feed unit configured to supply a liquid additive to the exhaust gas, and a permeable impingement structure, the flow guiding structure, the feed unit, and the permeable impingement structure being positioned one behind the other in the flow direction. The feed unit and the flow guiding structure are arranged and configured such that an impingement region of the liquid additive on the impingement structure overlaps the center of gravity of a flow distribution of the exhaust gas flowing through the impingement structure.

Abstract: The present disclosure relates to a twin scroll turbocharger device for an internal combustion engine having at least one combustion chamber. The turbocharger device comprises a turbine portion comprising a turbine wheel; a first turbine scroll and a second turbine scroll; and a first turbine scroll valve for allowing control of a flow of exhaust gas through the first turbine scroll. The turbocharger device also comprises a compressor portion comprising a compressor inlet; a compressor outlet; and a compressor wheel for pressurizing air received from the compressor inlet and providing pressurized air to the at least one combustion chamber via the compressor outlet. The turbocharger device further comprises a container for storing pressurized gas; a container conduit fluid flow connecting the container and the turbine portion for controllably providing pressurized air from the container to a first container inlet located between the first turbine scroll valve and the turbine wheel.