Abstract: A passive valve assembly for a vehicle exhaust system includes an exhaust component that defines an exhaust gas flow path and a vane that is positioned within the exhaust gas flow path. The vane is positioned at an initial start position and is movable between a closed position to provide a minimum exhaust gas flow and an open position to provide a maximum exhaust gas flow. The start position is orientated at a negative angle relative to the closed position.

Abstract: A valve suitable for closing an orifice (36) of a structure (10) of a silencer (1) for a motor vehicle exhaust line, includes a closing component (44) which is connectable to the structure (10) and capable of adopting a position for closing the orifice (36). The closing component (44) is capable of rising by bending from its closure position. The closing component (44) includes a closure plate (54) capable of closing the orifice (36) and at least one connection plate (56) capable of connecting the closure plate (54) to the structure (10), the closure plate (54) and the or each connection plate (56) having differing thicknesses and/or being made of materials having differing mechanical characteristics.

Abstract: A crossover for ducting exhaust produced by an engine. The crossover includes a front inside passage and rear outside passage. The front inside passage is configured to direct exhaust from one or more cylinders associated with a front of the engine to an inside volute of a turbocharger turbine. The rear outside passage is configured to direct exhaust from one or more cylinders associated with a rear of the engine to an outside volute of the turbocharger turbine. The inside volute is closer to the rear of the engine than the outside volute is.

Abstract: Devices and methods for improving fuel efficiency are disclosed herein. According to aspects illustrated herein, there is provided a device for improving fuel efficiency of a combustion engine. The device may include a housing for attachment to an exhaust pipe of a combustion engine and having a pathway extending therethrough. The device may further include a wound body disposed at a distal portion of the housing and designed to permit fluid from the exhaust pipe flowing along the housing to flow through the wound body. In addition, the device may include a barrier positioned within the pathway downstream from the wound body so as to generate a sufficient back pressure along the exhaust pipe to enhance piston stroke efficiency in the combustion system, resulting in an increase in fuel efficiency of the combustion engine.

Abstract: An exhaust gas apparatus suppresses sound pressure level from increasing, and reducing its weight and production cost without need of a sub-muffler in a tail pipe and a sound deadening device having an air column resonance of a large capacity provided at the upstream opened end of the tail pipe. The exhaust gas apparatus is provided with an exhaust gas pipe, an upstream opened end connected to the sound deadening device positioned at the upstream side of an exhaust gas discharging direction, and a downstream opened end through which the exhaust gas is discharged to the atmosphere. A plate is provided at least one of the upstream opened end and the downstream opened end in opposing relationship with the exhaust gas discharging direction, and formed with an opened portion. The exhaust gas pipe is formed at its peripheral wall axially inwardly spaced apart from the plate with a through bore.

Abstract: An exhaust tract for an internal combustion engine of a motor vehicle includes a first exhaust gas line, which conducts exhaust gases from the internal combustion engine to an exhaust-gas treatment device, and a second exhaust gas line, which forms a bypass line bypassing the exhaust gas treatment device. In order to ensure sufficient treatment of the exhaust gas even in the lean operating mode of an internal combustion engine, at least one first valve and one second valve are provided in series in the bypass line. An exhaust line is provided between the first valve and the second valve to reduce the pressure between the first and second valves. The pressure upstream of the second valve and the pressure downstream of the second valve, or the ambient pressure of the motor vehicle, are determined and negative pressure is applied to the exhaust line such that an exhaust gas flow via the second valve to the outside into the environment of the motor vehicle is prevented.

Abstract: An engine compartment arrangement for an agricultural harvester comprises an engine (10), a diesel particulate filter (12) coupled to the engine (10) to receive and filter hot exhaust gases therefrom, a fan (14), a radiator (16) disposed in a cooling airflow path in front of the fan (14) and coupled to the engine (10) to cool said engine (10), a cleaning air duct (18) having a first end (20) disposed immediately behind the fan (14) to receive a portion of the air ejected from the fan (14), and having a second end (22) disposed adjacent to the top of the diesel particulate filter (12) to exhaust a jet of the ejected air at a sufficient speed and in sufficient volume across the top surface (24) of the diesel particular filter (12) to prevent an accumulation of agricultural debris on top of the diesel particulate filter (12).

Abstract: An exhaust gas treatment device includes an inlet housing having an inlet opening for receipt of an exhaust flow from an engine aligned along a first axis. A main housing includes a cylindrical body portion defining a treatment zone and an exhaust outlet aligned along a second axis extending parallel to the first axis. The inlet housing is in fluid communication with and fixed to an outer surface of the main housing. The inlet housing includes a contoured wall including an end portion positioned opposite the inlet opening, an aperture extending through the wall transverse to the first axis, divergent side wall portions on opposite sides of the inlet opening, and a necked portion having a reduced cross-section positioned downstream of the inlet opening and upstream of the aperture. A component is coupled to the main housing for treating exhaust flowing through the treatment zone.

Abstract: An apparatus for treating exhaust includes a housing having an inlet and an outlet, the housing defining a chamber. The inlet is in fluid communication with a source of exhaust. A mixing tube is connected to the inlet. The mixing tube has at least two branches and a plurality of apertures defined in a wall of the mixing tube. A substrate is disposed between the mixing tube and the outlet. The at least two branches converge at an end section of the mixing tube to form a mixing loop.

Abstract: An exhaust system for use with an engine is disclosed. The exhaust system may have an exhaust passage with an indentation having an upstream wall and a downstream wall. The exhaust system may also have a nozzle disposed within the downstream wall, and a flow diverter cantilevered from the upstream wall partway into the exhaust passage.

Abstract: An exhaust flow divider is interposed between a head and an exhaust manifold of an internal combustion engine. The exhaust flow divider may be configured to maintain separation between two exhaust streams flowing from a cylinder of the engine through the head until, e.g., the exhaust exits the head and flows into the exhaust manifold.

Abstract: An exhaust gas aftertreatment unit (1) having an encapsulated design is constructed in a modular manner from disk-shaped components (2), which each receive exhaust gas aftertreatment units (3) and which are connected to supply connections (24, 25) on the encapsulated side with the flow occurring in the direction of the disk plane, wherein the components (2) are surrounded by frames (5) that are consecutively, in particular elastically, connected and clamped to each other transversal to the disk plane.

Abstract: An exhaust system for an engine having a plurality of combustion chambers includes a housing containing a first array of parallel positioned emission treatment devices and a second array of parallel positioned emission treatment devices axially spaced apart from one another. A first exhaust passageway is in fluid communication with the combustion chambers and contains the first array of emission treatment devices. A second and separate exhaust passageway is in fluid communication with the combustion chambers and contains the second array of emission treatment devices. A first valve restricts the exhaust flow through the first exhaust passageway. A second valve restricts the exhaust flow through the second exhaust passageway.

Abstract: An exhaust gas treatment system for reducing emissions from an engine includes an exhaust conduit adapted to supply an exhaust stream from an engine to an exhaust treatment device. An injector injects a reagent through an aperture in the conduit into the exhaust stream. A vortex breaker includes a mount having a cylindrical sleeve extending through the aperture as well as a flared tube fixed to and positioned within the cylindrical sleeve. A window extends through an upstream portion of the cylindrical sleeve exposing the flared tube to the exhaust stream. The sleeve includes a downstream aperture in fluid communication with the window.

Abstract: An exhaust pipe (100) for a fuel burning engine including a hollow body, the body having an internal surface (120), an external surface (110), a first open end (130), a second open end (140) and a longitudinal axis, wherein the internal surface (120) is shaped to form standing cyclic wave geometry having at least 2 cycles (c). When gas containing inhalable particles (22) enters the exhaust pipe (100) through the first open end (130) and flows out of the exhaust pipe (100) through the second open end (140), a substantial amount of inhalable particles (22) are grouped to form filterable particles (182).

Abstract: Features relating to engine efficiency and emissions controls are described. Systems, methods, articles or manufacture and the like can include features relating to integrated muffler and emissions controls for engine exhaust, water-injected internal combustion engine with an asymmetric compression and expansion ratio, controlled combustion durations for HCCI engines, piston shrouding of sleeve valves, low element count bearings, improved ports, and premixing of fuel and exhaust.

Abstract: A V-type engine is disposed in an engine room of a vehicle so that each cylinder bank of the V-type engine extends substantially in a vehicle length direction. Exhaust manifolds are attached to both side of the V-type engine in a vehicle width direction, respectively. Catalytic converters are attached to both gathering portions of the exhaust manifolds, respectively, in a manner that an axial line of each of the catalytic converters extends substantially in a vehicle height direction. An auxiliary component is disposed above one of the catalytic converters in the engine room. An oil pan is attached to a lower portion of the V-type engine. The one of the catalytic converters is located lateral to the oil pan. A center line of lower portion of the oil pan is shifted with respect to a center line of the vehicle in the vehicle width direction so that the lower portion of the oil pan is away from the one of the catalytic converters.

Abstract: An ECU executes a program including the steps of: when a switching valve is controlled to be closed, comparing exhaust gas's temperature, as detected, with a map value; if the exhaust gas's temperature is larger than the map value, determining that the switching valve normally operates; and if the exhaust gas's temperature is smaller than the map value, determining that the switching valve has abnormality.

Abstract: A valve comprises a support including an exhaust gas passage opening, a plug able to move by tilting between a plugging position and a release position of the passage opening, and an elastic strip for returning the plug to its plugging position. The elastic strip has a first end fastened to the support and a second end bearing on the plug. The second end is able to slide on the plug between a first position, in which the plug is in the plugging position, and a second position, in which the plug is in the release position. The plug includes a stop forming a hard spot that cooperates with the second end of the elastic strip when the elastic strip is in the first position, so that this stop forms an obstacle for movement of the second end of the elastic strip from the first position to the second position.

Abstract: A vehicle exhaust system includes an air entrainment component that is used to reduce exhaust gas temperatures exiting the vehicle exhaust system. The air entrainment component includes an exhaust pipe with a non-circular cross-section at one end and an overlap tube that substantially surrounds the non-circular cross-section to form an air gap between the exhaust pipe and the overlap tube. Cooling external air is drawn into the air gap to cool heated exhaust gases within the exhaust pipe.

Abstract: An exhaust mixer (16) is provided for use in an engine exhaust system (10) downstream from an additive injector (14). The mixer (16) includes a first wall structure (20), and a second wall structure (22) carrying a set of mixer vanes (30), the second wall structure (22) being cone shaped and extending radially outwardly from the first wall structure (20).

Abstract: A power system, including a multi-cylinder air breathing, fuel consuming diesel engine having a manifold with a common inlet for distributing combustion air to a plurality of cylinders. A valve is positioned in the intake manifold to at least restrict air flow to a group of the cylinders of the engine less than the total number of cylinders so as to increase the load and increase the temperature of exhaust gas for facilitating regeneration of a particulate filter.

Abstract: An exhauster for a motorcycle with a reduced number of components and reduced cost in a structure containing a variable passage area valve. An exhaust chamber has a box-shaped chamber main body, a plurality of expansion chambers a through c formed by sectioning the interior of the chamber main body with partitioning walls, and communication passages for connecting the expansion chambers a through c with one another. A variable passage area valve that controls passage area is contained in the communication passage.

Abstract: The present invention relates to a method and system for homogenizing exhaust from an engine. In one embodiment, the present invention includes an automobile. The automobile can include a fuel delivery unit, an engine, an exhaust system, and a control unit. The exhaust system can include a swirl inducement unit, multiple sensors, and multiple catalytic converters. The swirl inducement unit can homogenize an exhaust from the engine. The swirl inducement unit can include a plurality of vanes and/or a plurality of protrusions. The protrusions can be a plurality of bumps and/or a plurality of semi-circular rings. The plurality of vanes can be rotatable with the rotation of the vanes being controlled by the control unit. The rotation of the vanes can be based on an operating condition of the engine.

Abstract: A Tier 4 ready silencer that can accept both DOCs and DPFs to meet Tier 3 and can interface with an SCR system to meet Tier 4. The invention includes a silencer compartment with empty filter/catalyst banks in the shape of a V. DOCs and DPFs can be added and arranged in the V-shaped banks as needed. Various exhaust fins direct exhaust flow through the filters/catalysts. Multiple exhaust inlets to the device provide the most direct route possible from the engine outlets. A mixing tube and an SCR system can be added to the output port to comply with Tier 4.

Abstract: An exhaust throttle valve protected from disturbance due to stones scattered during operation of a vehicle. Front side exhaust pipes and rear side exhaust pipes are connected to a catalyst chamber disposed below a crankcase. The catalyst chamber and an exhaust chamber disposed to the rear thereof are connected to each other via a rear exhaust pipe. The diameter of the rear exhaust pipe is smaller than the lateral width of each of the catalyst chamber and the exhaust chamber, so that a recessed space is externally formed so as to recede inside of the vehicle. An exhaust throttle valve is received in the space. The exhaust throttle valve is partially exposed to the outside of the rear exhaust pipe and a throttle valve is received in the rear exhaust pipe to throttle-control the passage-sectional area of the rear exhaust pipe according to the rotation of the engine.

Abstract: A method for operating a metering valve and a device for performing the method, providing for diagnosis of the metering valve which defines a flow rate of a reagent to be introduced into an exhaust gas area of an internal combustion engine. The diagnosis is performed on the basis of an analysis of a measure for the flow rate during a diagnosis time. According to a first embodiment, after a diagnosis start signal has occurred with the metering valve closed, the reagent is brought to a predefined diagnosis starting pressure via a pump; the metering valve is then set at a predefined flow rate and the pressure difference occurring during the diagnosis time is analyzed. According to another embodiment, the amount of reagent delivered by the metering valve during the diagnosis time into a graduated beaker is analyzed.

Abstract: In one exemplary embodiment, an exhaust dilution and dispersion device for a vehicle can include a generally elongate tailpipe comprising an inlet section capable of being in exhaust receiving communication with an exhaust system of a vehicle. The tailpipe further comprises an outlet section in exhaust receiving communication with the inlet section. The outlet section can also comprise a downwardly directed exhaust deflection portion and an exhaust outlet in exhaust dispersing communication with the surroundings external to the device. The exhaust outlet can comprise a generally elongate exhaust dispersion opening extending in a lengthwise direction along the tailpipe. At least a portion of the exhaust outlet can be coextensive with the downwardly directed exhaust deflecting portion and a major portion of the exhaust dispersed from the outlet can have a transverse component.

Abstract: An exhaust manifold includes a plurality of branch pipes that guide exhaust gas discharged from cylinders, and a junction pipe that converges downstream-side end portions of the plurality of branch pipes in a flow direction of exhaust gas, and that has a drawn portion that is formed by drawing so as to be constricted in a radial direction of the drawn portion. The junction pipe is provided with a sensor that detects the oxygen concentration in exhaust gas. The sensor is provided at a downstream side of a deepest draw inside diameter in the flow direction of exhaust gas. The deepest draw inside diameter is the smallest inside diameter of the drawn portion.

Abstract: An exhaust system comprises a conical shell having an indentation helically traversing the exhaust passage so as to impart mixing on an engine exhaust gas flowing through an inner passage defined by the conical shell. The indentation may be formed into the conical shell via a stamping process.

Abstract: An exhaust gas aftertreatment device for an internal combustion engine producing the exhaust gas comprises an inlet configured to receive the exhaust gas, an outlet from which the exhaust gas exits the device, an aftertreatment element disposed between the inlet and the outlet, and a flow modification mechanism. The aftertreatment element has a front face receiving the exhaust gas from the inlet of the device, and the flow modification mechanism is configured to modify exhaust gas flow through the aftertreatment element in a manner that maintains uniform temperature across the front face of the element.

Abstract: An exhaust assembly includes a water trap blocking upstream water flow at a plurality of angular positions enabling universal application and flexibility of orientation.

Abstract: A silencer for a motorcycle with relaxed layout restrictions has a drum portion connected to a head. A conduit extends through the drum portion in a direction of connection. The drum portion decreases in cross sectional area toward a downstream side. A catalyst holding portion formed in the head has a catalyst fixed member to which a catalyst inserted member is fixed at a position upstream of the drum portion. A catalyst is inserted into the catalyst inserted member.

Abstract: An exhaust system for discharging exhaust gases through an exhaust passageway, emitted from a multi-cylinder combustion engine mounted on a motor vehicle includes a partition plate formed therein for dividing the exhaust passageway into a plurality of juxtaposed exhaust passages and having a communicating hole defined therein, and an exhaust gas sensor positioned at a location in proximity of the communicating hole for detecting a composition of the exhaust gases.

Abstract: A flap arrangement in an exhaust track of a motor vehicle includes an exhaust flap and a slave cylinder for controlling an operative position of the exhaust flap. The slave cylinder is fluidly connected to a master cylinder by a hydraulic line containing a hydraulic fluid in the form of liquid metal. The movement of the master cylinder is thus transmitted via the liquid metal to the slave cylinder. A mechanical coupling of the slave cylinder with the exhaust flap moves the exhaust flap to a respective operative position.

Abstract: A device is provided for admixing a reducing agent into an exhaust gas flow of an internal combustion engine having an exhaust system and a dosing device for feeding the reducing agent into the exhaust system. At least one heating rib, heatable by the exhaust gas and arranged downstream from the dosing device in the exhaust system is oriented largely in a flow direction of the exhaust gas. The dosing device is situated in or on a hollow body arranged on the exhaust system, an internal volume of which is connected to the exhaust system to conduct exhaust gas. An extremely low-flow device for admixing a reducing agent into an exhaust gas flow of an internal combustion engine is achieved by this design.

Abstract: A vehicle exhaust system includes an exhaust pipe that provides heated exhaust gases to a thermoelectric unit as an input. A temperature control mechanism ensures that exhaust gas is directed into the thermoelectric unit only if the exhaust gas is within a specified temperature range. The thermoelectric unit transforms the exhaust gas heat into electrical power.

Abstract: A muffler for a combustion engine includes walls forming a chamber, a first inlet, a first outlet, and a conduit. The first inlet is designed to receive exhaust gases from an exhaust duct of the engine. The exhaust gases pass through the chamber when moving from the first inlet to the first outlet. The exhaust gases then exit the muffler through the first outlet. The conduit extends between a second inlet and a second outlet. The second inlet is configured to receive fresh air entering the muffler. The fresh air then exits the conduit and is introduced into the exhaust gases through the second outlet.

Abstract: A muffler is disclosed. In the muffler a throttling device that is controlled by the energy of the airflow to be muffled is provided in a pipeline of the airflow that needs to be muffled. The muffler is adjusted by itself according to random variety of the pulsing airflow, and can eliminate or reduce effectively the pulsation of the airflow and the related noise in the range of the low frequency and the middle frequency. The muffling effect of the muffler has no correlation with the volume of the muffler, and therefore the volume of the muffler can be reduced.

Abstract: A V-type engine is disposed in an engine room of a vehicle so that each cylinder bank of the V-type engine extends substantially in a vehicle length direction. Exhaust manifolds are attached to both side of the V-type engine in a vehicle width direction, respectively. Catalytic converters are attached to both gathering portions of the exhaust manifolds, respectively, in a manner that an axial line of each of the catalytic converters extends substantially in a vehicle height direction. An auxiliary component is disposed above one of the catalytic converters in the engine room. An oil pan is attached to a lower portion of the V-type engine. The one of the catalytic converters is located lateral to the oil pan. A center line of lower portion of the oil pan is shifted with respect to a center line of the vehicle in the vehicle width direction so that the lower portion of the oil pan is away from the one of the catalytic converters.

Abstract: An exhaust system for an internal combustion engine includes an outer housing having a front shell and a rear shell, a prechamber in which exhaust gas from the combustion chamber enters, and an intermediate shell having a front and back as well as a catalytic converter holder. A catalytic converter element is arranged on the catalytic converter holder where an exhaust port directs exhaust gas from the catalytic converter element. To place the center of gravity of the exhaust system near the internal combustion engine or cylinder, the intermediate shell forms the prechamber and the exhaust port.

Abstract: A static mixer for the through-mixing of a flow in a line conducting the flow, more preferably of an exhaust system of a combustion engine with several guide vanes. To create adequate through-mixing at low flow velocity and a through-flow resistance that is not too high at high flow velocity, the guide vanes are produced of a shape memory alloy wherein below a predetermined limit temperature the guide vanes have at least one low-temperature shape and above the limit temperature the guide vanes have at least one high-temperature shape, which differs from the low-temperature shape through a reduced through-flow resistance of the mixer.

Abstract: An exhaust manifold A includes, in its collecting part structure, a plurality of branch pipes 2 to 5 that are connected with a flange head 1, a collecting part 6 that collects and contains exhaust-gas downstream side end portions 2a to 5a of the branch pipes 2 to 5, a partition plate 10 that is arranged in a state where its exhaust-gas downstream side end portion 10a projects in the interior of the collecting part 6, and a sensor attachment boss part 9 that is fixed by weld line X on a part of an outer circumferential portion of the collecting part 6 in a state where it faxes an insertion hole 6f formed in the collecting part 6.

Abstract: An apparatus for diluting and diffusing engine exhaust, includes a diffuser pipe horizontally oriented and having an inlet connection to receive exhaust gases from an engine and having an outlet defined as an elongated opening on an upper surface thereof, the inlet being disposed at about a longitudinal midpoint of the diffuser pipe, a deflector mounted in the diffuser pipe opposite the inlet to divide an entering exhaust gas flow toward opposite ends of the diffuser pipe, a baffle formed as an elongated plate having a multiplicity of holes mounted in the pipe between the inlet connection and the outlet and extending a length of the diffuser pipe, and, a dispersing grate formed as an elongated plate having a multiplicity of holes and being mounted above the outlet and spaced therefrom, the dispersing grate having a curvature about a longitudinal axis, and being mounted with a convex surface facing the outlet.

Abstract: An exhaust throttle valve 1 includes a housing 2 formed with a gas passage 2a, first and second valve shafts 3 and 4 rotatably journaled in the housing 2, a large valve body 5 connected to the first valve shaft, and a small valve body 6 connected the second valve shaft. A communication hole 17 is provided in the large valve body, and urging means that urges the small valve body in a direction of abutting against the large valve body is provided in the second valve shaft. When the large valve body closes the gas passage and pressure of a gas in the gas passage increases from a state where the small valve body closes the communication hole (FIG. 2(b)), the small valve body is separated from the large valve body against an urging force of the urging means to open the communication hole (FIG. 2(c)). With an easy configuration, exhaust gas pressure can be adjusted without depending on a gas temperature deference.

Abstract: A control system for a power system is disclosed. The control system has a first valve mechanism, a second valve mechanism, and a controller in communication with the first and second valve mechanisms. The controller is configured to direct a single electronic control signal to the first and second valve mechanisms. Actuation of the first valve mechanism is initiated in response to the value of the single electronic control signal exceeding a first threshold value, and actuation of the second valve mechanism is initiated in response to the value of the single electronic control signal exceeding a second threshold value.

Abstract: An engine exhaust dispersing device includes a tubular member having a first portion formed as a generally cylindrical wall and adapted to be mounted in fluid communication with an exhaust outlet and a second portion formed as a longitudinally-sectioned cylindrical wall defining a longitudinally extending opening, and, a wedge surface formed on said second portion and protruding into the longitudinally extending opening, the wedge surface having an apex adjacent or in the first portion and a base at an end of the second portion, the base having a width substantially equal to a width of the second portion.

Abstract: A particulate matter (PM) filter assembly includes a PM filter that filters PM from an exhaust stream and that includes an entry face facing a first direction of flow of the exhaust stream, and a swirl element disposed in the exhaust stream and that includes a blade that directs a portion of the exhaust stream in a second direction of flow that is different than the first direction of flow. The blade directs the portion of the exhaust stream to distribute the exhaust stream over a frontal area of the entry face of the PM filter. A related method of filtering particulate matter from an exhaust stream is also provided.

Abstract: The present invention relates to an exhaust gas treatment device for an exhaust system of a combustion engine, more preferably of a motor vehicle with a housing comprising a jacket and an outlet funnel, with at least one exhaust gas treatment element which is arranged in the jacket and which via a support ring is axially supported on the housing, wherein the outlet funnel comprises an outer funnel and an inner funnel. A simplified design is obtained if the outer funnel at an inner end facing the jacket is connected to the jacket in a fixed manner and at an outer end facing away from the jacket is connected in a fixed manner to the inner funnel, and if between the inner funnel and the outer funnel an insulation space circumferentially running in circumferential direction is formed and the inner funnel at an inner end facing the jacket carries the support ring and relative to the outer funnel is at least axially loose.

Abstract: An exhaust gas purification system including a reducing agent supplying apparatus and an exhaust gas purification apparatus, in that order from an upstream side of an exhaust passage in an internal combustion engine, and a control unit for controlling an amount of reducing agent supplied into the exhaust gas to recover purification capability of the exhaust gas purification apparatus. A concentration of the reducing agent in the exhaust gas, which flows into the exhaust gas purification apparatus, is varied temporally. The reducing agent is supplied in a proper amount to efficiently recover the purification capability. At the same time, the outflow of the reducing agent to the downstream side of the exhaust gas purification apparatus can be prevented.