Abstract: In an exhaust gas purification system for an internal combustion engine provided with a particulate filter and an SCR catalyst arranged downstream of the particulate filter, the present invention is intended to decrease an amount of NOx discharged into the atmosphere in a suitable manner.

Abstract: An exhaust gas purification device includes a diesel particulate filter (DPF) that traps particulate matter (PM), an exhaust gas temperature sensor that detects temperature of an exhaust gas, an electrostatic capacity detection unit that detects an electrostatic capacity of the DPF, an accumulated-amount estimation unit that estimates an amount of PM accumulated in the DPF on the basis of the electrostatic capacity, and a filter regeneration unit that can perform forced regeneration. On the basis of an accumulated-amount threshold that is lower than an upper PM accumulation limit, and a temperature threshold at which the accumulated PM can still be burned and removed even if an amount of fuel supply is reduced, the filter regeneration unit performs the forced regeneration if the amount of accumulated PM has reached the accumulated-amount threshold and the exhaust gas temperature reaches the temperature threshold.

Abstract: Provided is a NOx reducing device which is capable of effectively protecting a NOx controller against heat and water, while suppressing an increase in cost of a construction machine and deterioration in assemblability of the NOx controller. The NOx reducing device comprises a device body, a tail pipe provided at an outlet end portion of the device body, a NOx controller, and a mount table supporting the device body. The mount table comprises a top plate and a leg supporting the top plate. The device body and the tail pipe are provided on an upper side of the top plate. The NOx controller is provided with respect to a lower surface of the top plate in such a manner that the NOx controller is entirely covered from thereabove by the top plate.

Abstract: Various systems and methods are described for detecting ammonia slip. In one example method, an exhaust system with two NOx sensors uses transient responses of the NOx sensors to allocate tailpipe NOx sensor output to NOx and NH3 levels therein. An ammonia slip detection counter with gains is included that determines a probability of NOx and NH3 based on the measured sensor activities that are further processed by a controller to adjust one or more parameters based on the allocation and changes of sensor output.

Abstract: A process for desulfation of a NOx adsorber in a diesel internal combustion engine exhaust system is disclosed, which comprises: determining an amount of post fuel (Q2) required to reach a relatively rich target exhaust air fuel ratio (AFRrich) on the basis of a measured air flow; determining a heating-contributing fuel value (?Q2) required to reach or maintain a target desulfation temperature in said NOx adsorber by way of an exothermal reaction; calculating a target air flow (Airtgt) corresponding to the air flow required for a substantially stoichiometric combustion of a torque-contributing main fuel quantity (Q1) together with said heating-contributing fuel value (?Q2); and causing the engine to inject said post fuel amount (Q2) and said main fuel quantity (Q1) while controlling the air flow to meet said target air flow (Airtgt).

Abstract: An amount of NOx discharged from an internal combustion engine at the time of reducing the NOx stored in an NOx storage reduction catalyst is decreased.

Abstract: A mixer configuration for mixing an additive with an exhaust gas stream includes at least one overflow surface which is disposed in a mixing section of an exhaust pipe. The exhaust pipe has a cross section and a main flow direction of the exhaust gas stream. The at least one overflow surface is disposed centrally in the mixing section, is directed along the main flow direction of the exhaust gas stream and has a multiplicity of closed depressions. The mixer configuration permits an excellent mixture of the exhaust gas stream with an additive, without generating a high flow resistance in the process. A motor vehicle having a mixer configuration is also provided.

Abstract: In a control apparatus for an internal combustion engine in which an SCR catalyst is arranged in an exhaust passage, a dummy determination processing to determine whether the selective catalytic reduction catalyst is mounted at a location is carried out, based on a temperature difference between a temperature of exhaust gas flowing into the location where the selective catalytic reduction catalyst is to be arranged and a temperature of exhaust gas flowing out of the location, after starting of the internal combustion engine, wherein when a period of time for the temperature of the selective catalytic reduction catalyst to become equal to or less than a fixed temperature is equal to or more than a predetermined period of time, the dummy determination processing is carried out, whereas when the period of time is less than the predetermined period of time, the dummy determination processing is not carried out.

Abstract: A metering arrangement (3, 30) is proposed for a liquid exhaust-gas aftertreatment medium for the aftertreatment of the exhaust gas of an internal combustion engine which has an exhaust-gas system, in particular for a urea/water solution, having a delivery pump (7) and a metering module (13), wherein the delivery pump (7) is connected to a suction line (23) for sucking the exhaust-gas aftertreatment medium out of a tank (1), wherein the delivery pump (7) and the metering module (13) are connected to one another via a pressure line (25), and the exhaust-gas aftertreatment medium can be fed via the metering module (13) to the exhaust-gas system, wherein a recirculation pump (8) is arranged parallel to the delivery pump (7), wherein the recirculation pump (8) is connected on the suction side to the metering module (13). Furthermore, a corresponding method for metering is proposed.

Abstract: An after-treatment apparatus for exhaust gas in a combustion chamber includes a discharge device with an electrode exposed to the combustion chamber and installed in at least one of members constituting the combustion chamber, an antenna installed in at least one of the members constituting the combustion chamber so as to radiate electromagnetic waves into the combustion chamber, an electromagnetic wave transmission line installed in at least one of the members constituting the combustion chamber and with one end connected to the antenna and the other end covered with an insulator or dielectric and extending to a portion, in at least one of the members constituting the combustion chamber, distant from the combustion chamber, and an electromagnetic wave generator for feeding electromagnetic waves to the electromagnetic wave transmission line.

Abstract: An exhaust-gas heat exchanger for an exhaust system for cooling an exhaust-gas flow, having an inner pipe and an outer pipe, wherein the two pipes are indirectly or directly welded to one another in sealing fashion at the inlet side, a jacket pipe is arranged around the outside of the outer pipe and an annular gap for coolant is arranged between the outer pipe and the jacket pipe, and the inner pipe has an axial flow cross section (A2) at the end as viewed in the flow direction (S) and has a perforation (P2), which forms a radial flow cross section, in a direction at right angles to a flow direction (S). Between the inner pipe and the outer pipe there is formed an exhaust-gas duct for the exhaust-gas flow, wherein an intermediate pipe which is mounted in displaceable and/or rotatable fashion on the inner pipe is provided with a perforation (P4) by which the axial flow cross section (A2) of the inner pipe can be at least partially closed off.

Abstract: An object of the invention is to suppress deposition of ash in a wall-flow particulate filter while curtailing drops in a trapping rate of PM. To attain the above object, the invention provides a wall-flow particulate filter delimited by porous partition walls having pores of a size that allows ash and ash aggregates to pass therethrough. In the filter, a coat layer having pores smaller than the pores of the partition walls is provided, at a region of the partition walls, from an upstream end thereof up to a position before a downstream end thereof.

Abstract: The exhaust gas purification apparatus 100 according to the present invention is provided with an exhaust gas purification catalyst 40, an upstream O2 sensor 14, a downstream O2 sensor 15, and a control section 30 that executes main F/B control and sub-F/B control. This exhaust gas purification apparatus 100 contains, on a support in a prescribed region 45 from a catalyst-outlet-side end 43a at the downstream side of an exhaust gas purification catalyst 40, an OSC material having a pyrochlore structure and an OSC material having an oxygen storage rate that is faster than that of the OSC material having a pyrochlore structure.

Abstract: A vehicle that includes an engine, an exhaust system, and a controller, and a method are disclosed herein. The exhaust system includes a passage for directing the exhaust gas stream from the engine through the series of exhaust after-treatment devices, including a selective-catalytic reduction device and a diesel particulate filter (DPF). The exhaust after-treatment devices are employed to reduce various exhaust emissions of the engine. The exhaust system, may however, prematurely return failing emissions results due to the amount of contaminants that have flowed through the exhaust system since the last regeneration even of the particulate filter. Therefore, the controller may, via the present method, alter the threshold of the SCR efficiency diagnostic due to contaminants accumulated on the DPF and selectively enable or disable the diagnostic based on a set of recorded instructions, to improve the robustness of the SCR efficiency diagnostic and prevent inaccurate failing emissions results.

Abstract: Provided is an apparatus which is capable of excellently mixing exhaust gas discharged from an engine with exhaust air to thereby improve lowering of temperature of the exhaust gas and suppression of noise. The apparatus comprises: a duct provided beneath an engine and having an upper edge surrounding an exhaust air inlet; an exhaust-gas pipe having an intra-duct portion extend inside the duct in a direction approximately perpendicular to a flow direction of the exhaust air; and an exhaust-gas-pipe cover provided just above the intra-duct portion to protect the intra-duct portion from oil which can drop down from above.

Abstract: A water jacketed exhaust component includes an exhaust pipe having a radially inwardly tapered tail end, a water jacket disposed in surrounding relation with the exhaust pipe, and a generally V-shaped spray ring. The spray ring includes a first and second set of apertures that create diverging streams of cooling water. A first set of apertures creates an annularly disposed series of streams that are directed downstream and radially inward. These streams are generally directed toward the outer surface of the exhaust pipe structure which extends downstream of the spray ring. A second set of apertures creates an annularly disposed series of streams that are directed downstream and radially outward. These streams are generally directed toward the inner surface of the water jacket structure extending downstream of the spray ring.

Abstract: Embodiments for heating a vehicle cabin are disclosed. In one example, a method for an engine comprises pumping coolant from a coolant reservoir to an exhaust component and then to a heater core, the coolant heated by the exhaust component, and during engine warm-up conditions, adjusting a flow rate of coolant into a heater core to maximize heat transfer to a vehicle cabin.

Abstract: An exhaust gas purification device has: a catalyst to purify exhaust gas by reduction of nitrogen oxide included in the exhaust gas discharged from a combustion chamber of the engine, which catalyst has a purification efficiency of the nitrogen oxide varying depending on a temperature of the catalyst; a supply means capable of supplying a reduction agent for the reduction of the nitrogen oxide to the exhaust gas guided to the catalyst; and a control means having a configuration capable of controlling the temperature of the catalyst depending on an operating condition of the engine. The device has a configuration to prohibit controlling the temperature of the catalyst when a condition of being incapable of supplying the reduction agent in an amount corresponding to the temperature of the catalyst is satisfied, even if the temperature of the catalyst needs to be controlled.

Abstract: A control device of a diesel engine is provided. The device includes an engine body having a cylinder, a fuel injection valve for injecting fuel into the cylinder, a valve timing control module for changing opening and closing timings of at least an intake valve or an exhaust valve, an oxidation catalyst arranged within an exhaust passage for purifying HC discharged from the cylinder, and a DPF arranged downstream of the oxidation catalyst for capturing soot within exhaust gas. The device also includes a DPF regenerating module for supplying, when a predetermined DPF regeneration condition is satisfied, HC to the oxidation catalyst to regenerate the DPF by heat generated from an oxidation reaction of HC, and a fuel cutting module for stopping, when the diesel engine is in a deceleration state, a main injection of the fuel that is performed on a compression stroke of the cylinder.

Abstract: The present invention relates to an exhaust gas treatment device (4) and an exhaust system (1) having such an exhaust gas treatment device (4), wherein the exhaust system (1) has at least one exhaust-gas-conducting exhaust gas feed line (2, 3), which is attached to an inlet region (16) of the exhaust gas treatment device (4). Improved mixing of the exhaust gas and a space-saving configuration result if the exhaust gas treatment device (4) has at least one inlet (12, 13) which is open towards the inlet region (16) and if a mixing element (15) is provided, which connects the inlet region (16) to a through-flow region (17) by means of input openings (22, 23), wherein at least one first input opening (22) faces a first side (18) of the inlet region (16) and at least one second input opening (23) faces a second side (19) of the inlet region (16).