The exhaust gas after-treatment system of an engine configured as a gas engine or as a dual-fuel engine includes a catalyst, that can be flowed through by exhaust gas, a control tube extending through a recess in the catalyst, which control tube is movable relative to the catalyst and is flowable through by exhaust gas, and an actuator which is equipped to move the control tube relative to the catalyst dependent on at least one operating condition of the engine and/or at least one operating condition of the exhaust gas after-treatment system such that in a first relative position of the control tube relative to the catalyst, the catalyst can be flowed through by exhaust gas but not the control tube, and in a second relative position of the control tube relative to the catalyst, the control tube can be flowed through by the exhaust gas but not the catalyst.

An exhaust gate, in particular for a heavy-goods vehicle, has a housing, which has an inlet and first and second outlets, on which first and second valve seats are formed, and a valve flap, which can be pivoted between the two valve seats to close the first or second outlet. The housing is formed as a cast part, which connects the inlet and at least the first outlet integrally to each other. The valve flap has a larger cross section than the inlet and the first and second valve seats.

Methods and systems to control a temperature of a selective catalytic reduction catalyst are disclosed. In one example, a diverter valve that includes two butterfly valves that are coupled together via a shaft is adjusted to control a temperature at an inlet of the selective catalytic reduction catalyst so that the selective catalytic reduction catalyst may operate efficiently.

Gas flow and sound control valve for an exhaust system of an internal combustion engine comprising a housing including an inlet, a first outlet, and a second outlet, and a valve member arranged within the housing for forming a first conduit connecting the inlet to the first outlet and/or a second conduit from the inlet to the second outlet, wherein the valve member can be moved relative to the housing between a first predetermined position in which the valve member closes the second conduit and a second predetermined position in which the valve member closes the first conduit, whereby the valve member is rotatable around a valve axis aligned parallel, in particular coaxial, to a centerline of the inlet.

An exhaust after-treatment system for treating an exhaust produced by an engine. The exhaust after-treatment system includes an exhaust passage, at least one catalytic exhaust after-treatment component in communication with the exhaust passage for treating the exhaust, and a water-removal device in communication with the exhaust passage that receives a portion of the exhaust therein at a location positioned upstream from the catalytic exhaust after-treatment component. The water-removal device is defined by a housing that includes a water-removal membrane that separates water from the portion of the exhaust to provide a permeate that is enriched with water, and to produce a retentate that is water depleted that facilitates the treating of the exhaust by the catalytic exhaust after-treatment component.

In an exhaust gas purification apparatus provided in an exhaust as path of an engine, it is an object of the present invention to shorten a pipe length of a bypass path bypassing a purification catalyst as short as possible, thereby reducing initial costs. The exhaust gas purification apparatus includes a purification casing in which at least the purification catalyst is accommodated. The purification catalyst purifies exhaust gas from the engine. The purification casing is integrally provided with the bypass path separately from the purification path in which the purification catalyst exists. The bypass path makes the exhaust gas bypasses the purification catalyst without passing through the purification catalyst.

An exhaust-gas purification device includes an injection nozzle provided inside an exhaust pipe and a catalyst reactor provided on a downstream side of the injection nozzle, and is configured to inject urea water from the urea water injection nozzle into exhaust gas and to reduce nitrogen oxide in the exhaust gas by a NOx catalyst contained in the catalyst reactor, where the injection nozzle is disposed to inject the urea water toward the downstream side of the flow direction of the exhaust gas, and a mixer is connected to an upstream end of the catalyst reactor, the mixer having a plurality of plate members radially disposed around the axial center of the exhaust pipe, the plate members each being formed in such a way that angles of plate surfaces of the plate member to the flow direction are different values on the upstream side and the downstream side.

Provided is an air-purification device using a liquid reducing agent, comprising a pollution gas suction opening (3), a pollution gas purifying cavity (1) and a clean gas exhaust opening (11), wherein the pollution gas purifying cavity (1) is divided into a plurality of cavity bodies by a plurality of semi-plate-porous pollution-particle vertical isolation plates (7); a pollution cleaning liquid is placed in the pollution gas purifying cavity (1); one end of the semi-plate-porous pollution-particle vertical isolation plate (7) is closed, and one end thereof is in communication with two adjacent cavities through pores; and the pollution gas suction opening (3) and the clean gas exhaust opening (11) are respectively arranged on the first and last two cavities. (FIG. 2)

An exhaust gas aftertreatment system for an internal combustion engine is disclosed. In one embodiment, the system has a first aftertreatment element including a first inlet region and a first outlet region, and a second aftertreatment element including a second inlet region and a second outlet region The first outlet region is connected to the second inlet region via at least one connection section, and the at least one connection section extends outside the first aftertreatment element. At least parts of the first inlet region and of the second inlet region are arranged in a common distributor housing.

A control system for an engine including a turbocharger disposed downstream of a plurality of cylinders. The control system includes an engine sensor configured to generate a signal indicative of an operational characteristic of the engine. The control system includes a first valve configured to control exhaust flow through a first set of cylinders from the plurality of cylinders. The control system includes a second valve configured to control exhaust flow through a second set of cylinders from the plurality of cylinders. The control system includes a controller communicably coupled to the engine sensor, the first valve, and the second valve. The controller is configured to receive the signal generated by the engine sensor. The controller is configured to actuate the first valve and the second valve based on the received signal. The first valve and the second valve are actuated to adjust exhaust flow received by the turbocharger.