Abstract: A mixing device includes: an elbow pipe attached to an outlet pipe of a filter device, the elbow pipe changing a flow direction of an exhaust gas flowing from the filter device; a straight pipe connected to a downstream side of the elbow pipe, the straight pipe extending in a direction intersecting an axial line of the outlet pipe; an injector attached to the elbow pipe and injecting a reductant aqueous solution inside the elbow pipe toward the straight pipe; and a mixing pipe disposed in the elbow pipe to serve as a cover for the reductant aqueous solution, the mixing pipe being provided with openings on a circumferential wall thereof. A plurality of large openings are provided on a circumferential wall of the mixing pipe near the injector and a plurality of small openings are provided on a circumferential wall of the mixing pipe near the straight pipe.

Abstract: A vehicle and a method of determining a reductant storage capacity set point of a selective catalytic reduction filter (SCRF) of an exhaust treatment system of a vehicle are disclosed. The method includes determining a storage estimate of a reductant inside the SCRF and determining a particulate estimate in the SCRF representative of an amount of particulate matter collected inside the SCRF. The method also includes determining a particulate correction factor from the particulate estimate and calculating, via a controller, a set point value of the reductant in the SCRF by computing together the particulate correction factor and the storage estimate to determine the reductant storage capacity set point of the SCRF.

Abstract: A process which solves the problem of supplying NO2 in accordance with requirements by means of temperature control of the precatalyst which is decoupled from the operating state of the engine. In an associated apparatus, a precatalyst which contains at least one oxidation component and whose temperature can be controlled independently of the operating state of the engine and an active SCR stage comprising an SCR catalyst with upstream metering facility for a reducing agent from an external source are arranged in series. A particle filter can be arranged between precatalyst and metering facility. The precatalyst preferably additionally contains a nitrogen oxide storage material.

Abstract: A method is provided for determining the amount of ammonia which is stored in a storage container by a chemical bond to a solid storage medium, in particular a salt of an earth alkaline metal or the like, and which can be released by supplying heat in order to be supplied to a catalytic exhaust gas purification device of an internal-combustion engine. The storage medium functions as a dielectric of an electric capacitor and the stored amount of ammonia is inferred from the capacity of this capacitor. One wall of the housing of the storage container functions as a first electrode of the capacitor, and, within the storage container, at least one additional electrode is arranged such that at least a partial amount of the storage medium forms the dielectric. The storage container may have an essentially cylindrical shape. Several cylindrical electrodes can be arranged in a coaxial manner.

Abstract: A device for providing a reducing agent for an exhaust gas system includes a system heating unit for heating a reducing agent and at least one heat conduction element transmitting heat from the system heating unit to at least one of the following components: a tank, a delivery line, a filter, a pump, a valve or a sensor. A thermal heating method using a heat pipe and a motor vehicle having the device are also provided.

Abstract: In an exhaust gas purification apparatus or other apparatuses that are supplied with ammonia generated from a urea aqueous solution and causes selective reduction and purification of nitride oxides, a shot peening treatment is applied to a welded portion of its exhaust pipe which is made of a ferritic stainless steel plate and through which exhaust gas containing ammonia and hydrogen passes. By shot peening the welded portion of the exhaust pipe, a tensile residual stress in the welded portion of the exhaust pipe can be replaced with a compressive residual stress, and further the diameter of metal crystal grains in the welded portion can be reduced. In this way, the durability of the exhaust pipe can be improved.

Abstract: A work vehicle includes a vehicle body, a guiding pipe, a first heating section, and a second heating section. The vehicle body has a partition wall that partitions a space in an inner section into a first region and a second region. The guiding pipe is configured to guide a reducing agent. The guiding pipe has a first pipe section and a second pipe section. The first pipe section is positioned inside the first region. The second pipe section is positioned in the second region. The first heating section heats the first pipe section. The second heating section heats the second pipe section and adjusts the temperature independently from the first heating section.

Abstract: The present invention relates to a dosing valve and to a dosing device (15) for introducing a liquid medium into an exhaust-gas stream of an internal combustion engine (1) of a motor vehicle. The dosing device (15) has a pump (23) for delivering the liquid medium. The medium is injected into the exhaust-gas stream by means of a dosing valve (13) which can be controlled by way of an electromagnet (65). The dosing device (13) comprises a housing (33) with a stepped bore (34, 34.1, 34.2, 34.3, 34.4), wherein a pump sleeve (47) is guided sealingly in one portion (34.4) of the stepped bore (34). A hollow-bored piston (49) is guided sealingly in a central bore (48) of the pump sleeve (47). In a low-pressure chamber (61), an armature (69) is fastened to the piston (49), and furthermore a magnet sleeve (67) is fastened to the housing (33).

Abstract: A method for assessing NO2 generation efficiency in a diesel engine after-treatment (AT) system having a diesel oxidation catalyst (DOC) downstream of the engine generating the NO2 and a selective catalytic reduction (SCR) catalyst downstream of the DOC converting NOX with the aid of the NO2. Engine exhaust gas flow is passed into the AT system and a reductant is injected into the gas flow between the DOC and the SCR catalyst. SCR inlet gas flow temperature is monitored during transient engine operation and DOC inlet and SCR catalyst outlet NOX concentrations are detected when the SCR catalyst inlet gas flow temperature is in a predetermined range. SCR catalyst NOX conversion efficiency is determined using the detected DOC inlet and SCR catalyst outlet concentrations of NOX. Additionally, whether the NO2 generation efficiency is at or above threshold efficiency is assessed by comparing the determined and threshold NOX conversion efficiencies.

Abstract: The invention relates to an exhaust control device of an engine (10) comprising a catalyst (45) in an exhaust passage (40). In this invention, the active element transforms as a solid solution in the carrier when a catalyst temperature is higher than or equal to a predetermined solid solution temperature and an atmosphere in the catalyst is an oxidation atmosphere and the active element precipitates from the carrier when the catalyst temperature is higher than or equal to a predetermined precipitation temperature and the atmosphere in the catalyst is a reduction atmosphere.

Abstract: An exhaust system for a machine is disclosed. The exhaust system may have a diffuser configured to receive exhaust from an engine. The exhaust system may further have a plurality of dosers associated with the diffuser and configured to inject fuel into the diffuser. The exhaust system may also have a controller configured to selectively control an amount of fuel injected by each of the plurality of dosers based on a velocity of the exhaust adjacent to each doser. In addition, the exhaust system may have an after-treatment component fluidly connected downstream of the diffuser and configured to heat the exhaust by oxidizing the injected fuel.

Abstract: An exhaust gas post treatment system for an internal combustion engine, including an intake device for taking hydrocarbons into an exhaust gas pipe carrying the exhaust process gas from the internal combustion engine and a treatment device through which exhaust process gas flows downstream of the intake location and which increases the exhaust process gas temperature by oxidation of the hydrocarbons taken in. An exhaust gas post treatment system and a method for operating the same, in that the treatment device has catalytically coated components, the hydrocarbons are at least partly evaporated in the intake device and are modified chemically by cracking reactions and/or by partial oxidation, and the proportion of platinum, at least in a subregion of the catalytic coating of the components, is less than 50% of the overall mass of all the catalytically active substances in this sub region of the coating.

Abstract: An exhaust gas emission control system for a diesel engine, having an oxidation catalyst (DOC) (7) and a diesel particulate filter (DPF) (9) in an exhaust passage, wherein a late post-injection control unit (62), which injects fuel into a combustion chamber at a timing not contributing to combustion in DPF regeneration control, feedback controls a late post-injection amount such that a regeneration amount of soot regenerated by the DPF (9) becomes a target soot regeneration amount per unit time.

Abstract: Provided is an ammonia injection device (10) installed at an exhaust gas duct through which an exhaust gas generated in a gas turbine flows, and configured to inject ammonia into the exhaust gas at an upstream side of a denitration catalyst configured to perform denitration processing in a flowing direction of the exhaust gas, the device including a plurality of ammonia injection pipes (11) disposed in parallel each other in a surface which traverses the exhaust gas duct. A plurality of nozzle pipes (12) configured to eject the ammonia from the ammonia injection pipes in an arrangement direction of the plurality of ammonia injection pipes are installed at the ammonia injection pipe in a longitudinal direction of the ammonia injection pipes. Diffuser panels (13) extending toward a downstream side in a flowing direction of the exhaust gas at both sides in a longitudinal direction of the ammonia injection pipes with respect to the nozzle pipes are formed at the nozzle pipes.

Abstract: A container for a tank for storing a liquid additive includes a housing having a heater and at least one drivable apparatus for promoting convection in the housing. A motor vehicle includes a tank for storing a liquid additive and an exhaust gas system having a metering or adding device for the liquid additive. A container is inserted into the tank wall and a plurality of functional components is provided in the container for conveying the liquid additive from the tank through the container to the metering or adding device.

Abstract: An exhaust system for treating an exhaust gas from an internal combustion engine is disclosed. The system comprises a modified lean NOx trap (LNT), a urea injection system, and an ammonia-selective catalytic reduction (NH3-SCR) catalyst. The modified LNT comprises platinum, palladium, barium, and a ceria-containing material, and has a platinum:palladium molar ratio of at least 3:1. The modified LNT stores NOx at temperatures below about 200° C. and releases the stored NOx at temperatures above about 200° C. The urea injection system injects urea at temperatures above about 180° C.

Abstract: A pump assembly (214) for an exhaust treatment system is provided that may include a housing (220), a gas flow path (259), a reductant flow path (239) and a pump (224). The housing may include a first inlet (236) configured to receive a reductant from a tank (210), a second inlet (252) configured to receive a gas from a gas compressor (13), and an outlet (262) through which the gas and the reductant exit the housing. The gas flow path may extend between and fluidly communicate with the second inlet and the outlet. The reductant flow path may extend between and fluidly communicate with the first inlet and the outlet. The pump may be at least partially disposed within the housing and may include a motor in a heat transfer relationship with gas flowing through the gas flow path.

Abstract: In the exhaust gas purification system, a diesel particulate defuser (“DPD”) for trapping particulate matter (“PM”) in exhaust gas is connected to an exhaust pipe of an engine to automatically regenerate the DPD by raising a temperature of the exhaust gas from the engine by carrying out post injection when an amount of PM in the DPD exceeds a predetermined amount. Further, the system includes detecting the temperature of the exhaust gas during DPD regeneration when the DPD is automatically regenerated, calculating a deviation between the detected temperature of the exhaust gas and a target temperature for the DPD regeneration, and controlling a quantity of the post injection by resetting an integral control term used in a PID control to zero when running mode automatic regeneration is shifted to idling mode automatic regeneration after a vehicle is stopped, when PID-controlling the quantity of the post injection based on the deviation.

Abstract: A turbocharged internal combustion engine disclosed that may comprise an engine block with a first end side opposing a second end side and a two-stage turbocharged system. The two-stage turbocharged system may comprise a low-pressure turbocharger with a first turbine and a first compressor and a high-pressure turbocharger with a second turbine and a second compressor. A turbine connection may fluidly connect the first turbine and the second turbine and a compressor connection fluidly connects the first compressor and the second compressor. The low-pressure turbocharger is mounted at the first end side of the engine block and the high-pressure turbocharger is mounted at a second end side of the engine block.

Abstract: An exhaust gas aftertreatment system for an internal combustion engine, particularly for a ship's diesel engine operated with heavy oil, has a SCR catalyst that uses ammonia as reductant. A nozzle is positioned upstream of the SCR catalyst viewed in flow direction of the exhaust gas. Using the nozzle, an aqueous urea solution is decomposed at a defined pressure and at a defined temperature to form water vapor, carbon dioxide and ammonia vapor such that ammonia evaporated by the nozzle is injected into the exhaust gas via the nozzle.

Abstract: A diesel particulate filter (“DPF”) system that is more convenient than a conventional DPF system, including a DPF having a catalyzed soot filter (“CSF”) that is connected to an exhaust pipe of a diesel engine in order to collect particulate matter (“PM”) in exhaust gas, and a diesel oxidation catalyst (“DOC”) provided on an upstream side of the CSF; and temperature sensors provided respectively on an upstream side and a downstream side of the DOC. When a PM accumulation amount in the CSF exceeds a fixed amount, DPF regeneration is performed by setting a temperature detected by the upstream side temperature sensor at or above a first threshold and setting a temperature detected by the downstream side temperature sensor at or above a second threshold. When a breakdown is detected in the upstream side temperature sensor, the second threshold is modified upward.

Abstract: A method for operating an exhaust gas treatment system that includes an SCR catalytic converter is provided. Either a model-based filling level regulation for achieving the target filling level or a model-based efficiency control for achieving the target efficiency is performed according to presettable values for certain operating variables such as a temperature of the exhaust gas or of the SCR catalytic converter.

Abstract: An injector for injecting a reagent into an exhaust stream includes an outer tube extending through an electromagnet and surrounding an inner tube. A first end of the inner tube is sealingly fixed to an inner surface of the outer tube. A guide member and an orifice plate are each sealingly fixed to the inner surface of the outer tube. A second end of the inner tube is aligned by the guide member. A moveable valve member includes a pintle head guided by the inner surface of the outer tube to align the valve member with an orifice extending through the orifice plate.

Abstract: An exhaust gas treatment unit at least includes an approach flow region, a diverting region, a backflow region and an outflow region disposed consecutively in terms of flow. The backflow region and the outflow region are disposed on an outer surface of the approach flow region and an addition unit for a reaction agent is disposed in the outflow region. A motor vehicle having an exhaust gas treatment unit is also provided.

Abstract: An exhaust gas purifying system includes: a SCR catalyst which has a function of reducing NOx and absorbing NO2; an upstream catalyst which is provided at the upstream side of the SCR catalyst and has a three-way purification function; and an air-fuel ratio controller which controls the air-fuel ratio of the air-fuel mixture. The controller calculates the NO2 storage amount of the SCR catalyst (S2), calculates a value of the NOx correlation parameter that increases in response to the NOx discharge amount (S4), sets the stoichiometry determination threshold value to a small value as the NO2 storage amount increases (S5), and changes the operation mode of the engine to the stoichiometry operation mode in which the air-fuel ratio is controlled to stoichiometry when the value of the NOx correlation parameter is larger than the stoichiometry determination threshold value (S6, S9).

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 exhaust treatment system to treat exhaust gas includes a particulate filter and a pressure sensor. The particulate filter is configured to trap soot contained in exhaust gas. The pressure sensor is configured to output a pressure signal indicative of a pressure differential of the particulate filter. The exhaust treatment system further includes a soot mass module configured to determine a soot mass. The soot mass is indicative of an amount of soot stored in the particulate filter based on the pressure differential and a soot model stored in a memory device. The exhaust treatment system further includes a continuously regenerating trap (CRT) compensation module configured to generate a variable CRT threshold. The CRT compensation module selectively outputs a CRT compensation value that modifies the soot model based on comparison between the NOx flow rate and the soot mass-based variable CRT threshold.

Abstract: A work machine includes a diesel engine; a gas emission cleaning device having a filter for trapping particulate matter included in gas emissions emitted from the diesel engine; and a filter regenerating device for performing automatic regeneration to automatically combust and eliminate particulate manner that has accumulated in the gas emission cleaning device, when the accumulated amount of the particulate matter has exceeded a predetermined value. The filter regenerating device has an automatic-regeneration-allowing device for allowing the automatic regeneration to be carried out by an external command; and, at startup, the automatic-regeneration-allowing device disallows carrying out automatic regeneration.

Abstract: The exhaust gas purification device includes an exhaust gas post-processing device 30 provided in an exhaust passage 11 of an engine 10, an exhaust injection valve 22, a first catalyst 35, a second catalyst 36 for thermally decomposing fuel injected by the exhaust injection valve 22, an exhaust temperature estimation unit 41 for estimating an exhaust temperature, an engine injection control unit 42 for controlling fuel injection in the engine 10, and regeneration control units 43, 44 for controlling regeneration of the exhaust gas post-processing device 30. When an output value output by the exhaust gas temperature estimation unit 41 is equal to or lower than a threshold during regeneration by the regeneration control units 43, 44, the engine injection control unit 42 controls fuel injection in the engine by performing a multistage injection, which includes a post injection for supplying fuel to the first catalyst 35.

Abstract: An exhaust after-treatment system for treating an exhaust produced by an engine. The exhaust after-treatment system may include an exhaust passageway in communication with the engine, and an exhaust treatment component provided in the exhaust passageway. A dosing module for dispensing an exhaust treatment fluid into the exhaust passageway can be located between the engine and the exhaust treatment component. A coolant source and a modular liquid-cooled mount for supporting and cooling the dosing module is also provided. The liquid-cooled mount communicates with the coolant source and includes an inlet sub-mount including a first coolant passageway, a base sub-mount including a second coolant passageway, and at least one intermediate mount disposed between the inlet sub-mount and the base sub-mount that includes a third coolant passageway, wherein each of the first, second, and third coolant passageways are in communication with each other.

Abstract: An exhaust gas post-treatment unit includes a diesel particulate filtering device that treats engine exhaust gas, a selective catalyst reduction device that treats the engine exhaust gas, a connecting pipe, an injection device, a cooling water supply pipe and a cooling water return pipe. The connecting pipe connects the diesel particulate filtering device and the selective catalyst reduction device. The injection device is disposed on the connecting pipe and injects a reducing agent into the exhaust gas supplied to the selective catalyst reduction device. The a cooling water supply pipe guides cooling water to the injection device to cool the injection device. The cooling water return pipe discharges the cooling water from the injection device. At least one of the cooling water supply pipe and the cooling water return pipe has a convection section extending upward along the connecting pipe from a connecting portion with the injection device.

Abstract: In forced regeneration control of an exhaust gas purification device 12, data for control such as the number of meshes of a data map and the number of data maps for forced regeneration control is reduced and occurrence of torque shock is avoided by smoothly changing a fuel pressure. In the forced regeneration control of the exhaust gas purification device, when an operation state of an internal combustion engine is in a high-load operation state, normal injection control by stopping multi injection is carried out and according to a rotation speed and a load of the internal combustion engine, a region for control is divided into a multi-injection control region, a transition region, and a normal injection control region, and in the transition region, data for fuel pressure control obtained by interpolation of data for fuel pressure control on the multi-injection control region side and data for fuel pressure control on the normal injection control region side is used.

Abstract: According to one embodiment, an apparatus (50) for mounting to an inner wall (33) of an exhaust tube (32) includes a tube engagement surface (52) and an exhaust engagement surface (54A). The tube engagement surface comprises a convex surface of a constant first radius of curvature about a first axis. The exhaust engagement surface is adjacent the tube engagement surface, and includes a concave surface of a second radius of curvature about a second axis generally perpendicular to the first axis.

Abstract: The invention relates to a metering module (10) for metering a reduction means in an exhaust system of an internal combustion engine. The metering module (10) comprises at least one cooling element (22, 24) through which cooling fluid flows. The metering module (10) has a cooled connection piece (44) that is actively cooled by the cooling fluid.

Abstract: An exhaust after-treatment system associated with a diesel engine includes a diesel exhaust fluid storage unit. The storage unit includes a diesel exhaust fluid tank and a vent system coupled to the tank and configured to regulate flow of air into the tank and fluid vapor out of the tank.

Abstract: An exhaust gas treatment device includes an exhaust gas treatment component for conducting a flow in a flow direction from an inflow side to an outflow side. A metering device for metering reducing agent into the exhaust gas treatment device is disposed downstream of the outflow side in the flow direction. The metering device has a metering direction which runs at least partially counter to the flow direction. The outflow side of the exhaust-gas treatment component is spanned at least partially by a porous layer and there is a spacing between the metering device and the exhaust-gas treatment component selected in such a way that injected reducing agent reaches the porous layer. A motor vehicle having the device is also provided.

Abstract: A system for mixing ammonia (reductant) with engine exhaust includes an exhaust flow created by a vehicle engine, an ammonia feed line passing into the exhaust flow, an injector connected to the feed line and positioned within the exhaust flow, the injector having at least one port for discharging ammonia into the exhaust flow, and a mixing plate positioned within the exhaust flow downstream of the ammonia injector and stabilizing at least one of either the feed line and the injector. An aspect of the invention is to stabilize the injector by attaching the mixing plate to the feed line to provide such stability. Alternatively or additionally, the mixing plate is attached to the injector to stabilize. The feed line may even pass through the mixing plate.

Abstract: A multi-stage SCR system including a front reductant injecting device, a front mixer, a front SCR catalyst, a back reductant injecting device, a back mixer, a back SCR catalyst, and a DCU. The front and back reductant injecting devices receives reductant from an air-driven pump, which includes a liquid supply tank, a pressure tank, and solenoids control valves. Under pressure provided by a compress air source, reductant is pressed into the front and back reductant injecting devices from the air-driven pump. The front and back reductant devices also have flow-back paths fluidly connected to a reductant tank. And in purging or maintenance heating, the flow-back paths can be energized open. In the multi-stage SCR system, a DOC can be further positioned in between the two SCR devices for increasing the deNOx efficiency in the back SCR catalyst, so that the system is less sensitive to catalyst aging.

Abstract: A Diesel Exhaust Fluid (DEF) that includes urea, demineralized water and between 5 and 300 ppm formaldehyde, this formulation of DEF include less than 0.6 ppm of phosphates, calcium, iron, aluminum, magnesium, sodium, and potassium, the formulation also includes less than 0.3 ppm copper, zinc, chromium, and nickel. This formulation of DEF reduces the accumulation of urea deposit in the diesel exhaust system relative to other formulation of specification grade DEF that include less formaldehyde.

Abstract: An exhaust aftertreatment system may include a first housing and a burner. The first housing may include first and second chambers. The first chamber may include an exhaust gas inlet receiving exhaust gas from an engine. The second chamber may receive exhaust gas from the first chamber and may include an exhaust gas outlet. The burner may include a second housing and a combustion chamber disposed within the second housing. The second housing may be at least partially disposed within the first chamber. The burner may supply heated gas to the second chamber. The heated gas within the burner may be fluidly isolated from exhaust gas in the first chamber. The second housing may be in a heat transfer relationship with exhaust gas in the first chamber.

Abstract: A guidance output device, which outputs guidance for improving fuel economy when an energy wasting operation is detected in a construction machine that is provided with an exhaust gas purifying device for an internal combustion engine, includes a regeneration process determining unit that determines whether a regeneration process is in progress in the exhaust gas purifying device. It also includes a guidance output restriction unit that restricts an output of the guidance for energy saving by the guidance output unit when the regeneration process determining unit determines that the regeneration process is in progress in the exhaust gas purifying device.

Abstract: A method of regenerating a particulate filter of an exhaust system is provided. The method includes determining a first regeneration mode based on a soot level; generating control signals to a first fuel injector associated with an engine based on the first regeneration mode; determining a second regeneration mode based on the soot level; and generating control signal to a second fuel injector associated with an exhaust stream of the exhaust system based on the second regeneration mode.

Abstract: A mixing plenum for exhaust gas comprises a canister with an inlet and an outlet. A bulkhead is located downstream from the inlet to define an exhaust gas consolidation chamber. An opening in the bulkhead allows exhaust gas to enter a u-shape conduit configured to direct the exhaust gas from a downstream direction to an upstream direction before releasing the exhaust gas back into the plenum downstream of the bulkhead. An injector is configured to inject fluid into the exhaust gas entering the conduit. A conduit exit located a distance “E” from the downstream side of the bulkhead allows the exhaust gas/fluid mixture to exit the conduit into a larger exit volume of the compact mixing can, in the manner of an expansion chamber, where its velocity slows and further mixing of the fluid/exhaust gas occurs and exits the compact mixing can through the outlet flange.

Abstract: A reductant delivery system is provided for delivery of reductant to an engine exhaust aftertreatment system that is heated during cold temperature conditions. A heat exchange fluid flows through a heat exchange circuit that provides a flow path from the heat source to the doser, from the doser to the reductant storage tank, and from the reductant storage tank to the heat source. A control valve controls the flow of the heat exchange fluid in the heat exchange circuit so that at least one heat exchange cycle includes a circulation period that increases the temperature of the reductant in the doser and storage tank and a termination period where circulation is stopped until reductant temperature in the doser reaches a lower limit.

Abstract: SCR system for treating the exhaust gases of an internal combustion engine, this system comprising a line for feeding a urea solution into the exhaust gases and a pump capable both of feeding the urea solution into the exhaust gases and of purging at least one part of the line by sucking a gas therethrough by means of a suction device, this system also comprising a control unit capable of activating and/or deactivating the operation of the pump and that of the suction device in a sequential manner in the course of one and the same purge procedure.

Abstract: An apparatus that raises temperature of a post-catalyst at an early time while suppressing reducing agent poisoning of the post-catalyst and discharge of a reducing agent into the outside when a pre-catalyst and the post-catalyst are arranged in series in an exhaust passage of an internal combustion engine in order from an upstream side thereof. The pre-catalyst is arranged to allow an exhaust gas to flow between an outer peripheral surface thereof and an inner peripheral surface of the exhaust passage. A reducing agent addition valve adding a reducing agent to allow the reducing agent to pass through the pre-catalyst is arranged immediately upstream of the pre-catalyst in the exhaust passage. Further, a retention catalyst is arranged in the exhaust passage between the pre-catalyst and the post-catalyst, to temporarily retain the reducing agent in the exhaust gas.

Abstract: The invention relates to a reservoir tank, particularly for receiving a reducing agent for metering into the exhaust gas tract of an internal combustion engine. A spill basin is accommodated in the hollow space of the reservoir tank. At the base region, the spill basin is radially and axially guided into a recess of the reservoir tank base.

Abstract: An exhaust aftertreatment system may include a reductant supply and diluent supply conduits, an injector and a control module. The reductant supply conduit includes a first valve controlling a flow of reductant through the reductant supply conduit. The diluent supply conduit includes a second valve controlling a flow of diluent through the diluent supply conduit. The injector is in fluid communication with the reductant supply conduit and the diluent supply conduit and is configured to provide fluid to an exhaust stream. The control module may control the first valve to provide a targeted amount of reductant through the injector. The control module may control the second valve to maintain a fluid flow rate through the injector that is at or above a minimum flow rate threshold of the injector based on a difference between a flow rate through the reductant supply conduit and the minimum flow rate threshold.

Abstract: A component carrier of a dosing system including a plurality of components for injecting a urea solution into the exhaust gas flow of an internal combustion engine comprises a base plate forming the component carrier, a plurality of inner flow channels integrated into the base plate, and an inlet port and an outlet port connecting the inner flow channels with the coolant circuit of the internal combustion engine. The component carrier is heated by flowing a fluid having an elevated temperature and circulating in the coolant circuit from the inlet port to the outlet port passing through the inner flow channels and transferring the heat from the fluid to the component carrier. The components of the dosing system mounted on the component carrier and in thermal contact with the component carrier are heated by heat transfer from the heated component carrier.

Abstract: An exhaust gas system includes a reducing agent preparation section having a first cylindrical exhaust gas line pipe section opening approximately perpendicularly into a second exhaust gas line pipe section via an opening in a cylinder lateral surface of the second exhaust gas line pipe section. An injector unit for introducing the reducing agent into the exhaust gas is situated at the first exhaust gas line pipe section, upstream from the opening. The opening in the cylinder lateral surface of the second exhaust gas line pipe section has a larger extension in the direction of the longitudinal extent of the second exhaust gas line pipe section than transversely thereto. In a method using the reducing agent preparation section a rotating exhaust gas flow is formed within the second exhaust gas line pipe section.