An exhaust aftertreatment system for an internal combustion engine includes an outer casing having an exhaust gas inlet and an exhaust gas outlet between which a fluid flow path for exhaust gases is provided, a selective catalytic reduction unit provided in the fluid flow path for reducing nitrogen oxides, a reductant dosing device for adding reductant to the exhaust flow upstream of the selective catalytic reduction unit, and a rotatable mixer device for mixing the reductant with exhaust gases upstream of the selective catalytic reduction unit, an air inlet valve provided upstream of the mixer device for introducing air into the fluid flow path, and an electric motor arranged for rotating the mixer device to create a suction of air into the fluid flow path via the air inlet valve.

An exhaust purification apparatus for an internal combustion engine has an exhaust purification catalytic agent disposed in an exhaust passage. The exhaust purification apparatus for the internal combustion engine has an exhaust throttle valve, an actuator, and a controller. The exhaust throttle valve is arranged upstream of the exhaust purification catalytic agent in the exhaust passage and changes a passage sectional area of the exhaust passage. The actuator operates the exhaust throttle valve to be open and closed. The controller controls the exhaust throttle valve to be open and closed through the actuator. The controller decreases an opening degree of the exhaust throttle valve to narrow the passage sectional area of the exhaust passage upon a heating request for heating the exhaust purification catalytic agent.

Methods and systems are provided for an exhaust bypass valve and a heat exchanger upstream of a three-way valve. In one example, a method may include flowing exhaust gas through one or more of an exhaust passage, bypass passage, recirculating passage, and EGR passage based on positions of a three-way valve and a bypass valve.

An exhaust gas stream for an internal combustion engine includes a muffler housing (12) with a first chamber (14) and a second chamber (16). An exhaust gas inlet (24) has a first chamber opening area (30) and a second chamber opening area (32). An exhaust gas outlet (36) is open in an outlet opening area (42) towards the first chamber. A connection opening (50) is provided between the first chamber and the second chamber and has an exhaust valve arrangement associated therewith, including a valve element (56) including a closing area (58) closing the connection opening in a closed position of the exhaust valve arrangement (52). The exhaust valve arrangement includes an actuating area (64) associated with the inlet second opening area for generating an actuating force acting on the exhaust valve arrangement, moving from the closed position in the direction of an open position by exhaust gas bypass flow.

A gas scrubber and a waste gas treatment system with a gas scrubber for removing particles from a waste gas has a housing with a waste gas inlet and a waste gas outlet. A substantially circular plate member defining an axis of rotation is rotatably arranged in the housing. Waste gas fed into the housing via the waste gas inlet is directed toward approximately the center of the circular plate member. An outlet nozzle sprays a liquid, especially a cleaning liquid or a scrubbing liquid, onto the circular plate member, in order to obtain a mixture of waste gas and liquid in front of the plate member. A combination of inner and outer rotor arrays, and inner and outer stator arrays are arranged alternatingly and concentrically relative to each other, and separated from the circular plate member, and rotate about the axis of rotation. A rotary atomizer for atomizing the mixture of waste gas and liquid may be arranged on the circular plate member. Particles from the waste gas stream are transferred into the liquid.

An adaptive urea mixer comprises a housing (1) and a first movable plate (2), a second movable plate (3), and a first fixed ring (4) sequentially provided in a direction from an air inlet to an air outlet in the housing. The first fixed ring (4) is fixedly connected to an inner side wall of the housing (1). A plurality of guide columns (9) are provided on the first fixed ring (4). A first position-limiting portion and a second position-limiting portion are provided on the guide column (9). The first movable plate and the second movable plate are sleeved on the guide column (9). A first elastic support element (12) is sleeved on the guide column (9) between the second position-limiting portion (11) and the first movable plate (2), and a second elastic support element (13) is sleeved on the guide column (9) between the first fixed ring (4) and the second movable plate (3). Both a first flow guide plate and a second flow guide plate are fixedly connected to the first fixed ring (4). The first movable plate (2), the second movable plate (3), the first flow guide plate (5), and the second flow guide plate (6) define a mixing space (14). A urea nozzle (7) is provided on a side wall of the housing corresponding to the mixing space (14). The adaptive urea mixer adapts to a change in a flow rate of exhaust gas so as to automatically remove internal crystals, thereby preventing the crystals from blocking the urea mixer.

In one aspect, an aspiration system for a work vehicle includes an exhaust tube extending along a flow direction from an upstream end to a downstream end. The exhaust tube defines an exhaust passage extending from the upstream end of the exhaust tube to the downstream end of the exhaust tube. The exhaust tube includes a venturi portion. The aspiration system also includes an aspiration tube in flow communication with the venturi portion and configured to receive an aspirated airflow. The system further includes a flow adjustment mechanism provided in operative association with venturi portion such that the flow adjustment mechanism is configured to adjust a cross-sectional flow area of the venturi portion of the exhaust tube.

In one aspect, an aspiration system for a work vehicle includes an exhaust tube extending along a flow direction and an aspiration tube in flow communication with the exhaust tube at an aspiration zone of the exhaust tube such that the aspiration tube is configured to receive an aspirated airflow. The system also includes an airflow area modifier provided in operative association with the aspiration zone and actuatable to adjust a cross-sectional flow area of the exhaust tube within the aspiration zone. The system includes an actuator provided in operative association with the airflow area modifier such that the actuator is configured to alter an orientation of the airflow area modifier such that the cross-sectional flow area of the exhaust tube within the aspiration zone is adjusted.

According to an aspect of the present invention, it is possible to easily support a spark arrester and prevent an occurrence of damage or sound in the spark arrester due to the effect of an exhaust pressure or external vibration. In a spark arrester, at least a flange part is formed of a spring member. The flange part includes a bent part that is telescopically bent by elastic deformation in a direction along a flow of exhaust gas. The bent part is supported between a tail pipe and a muffler in a state where the elastic deformation of the bent part is allowed.

An adaptive urea mixer comprises a housing (1) and a first movable plate (2), a second movable plate (3), and a first fixed ring (4) sequentially provided in a direction from an air inlet to an air outlet in the housing. The first fixed ring (4) is fixedly connected to an inner side wall of the housing (1). A plurality of guide columns (9) are provided on the first fixed ring (4). A first position-limiting portion and a second position-limiting portion are provided on the guide column (9). The first movable plate and the second movable plate are sleeved on the guide column (9). A first elastic support element (12) is sleeved on the guide column (9) between the second position-limiting portion (11) and the first movable plate (2), and a second elastic support element (13) is sleeved on the guide column (9) between the first fixed ring (4) and the second movable plate (3). Both a first flow guide plate and a second flow guide plate are fixedly connected to the first fixed ring (4). The first movable plate (2), the second movable plate (3), the first flow guide plate (5), and the second flow guide plate (6) define a mixing space (14). A urea nozzle (7) is provided on a side wall of the housing corresponding to the mixing space (14). The adaptive urea mixer adapts to a change in a flow rate of exhaust gas so as to automatically remove internal crystals, thereby preventing the crystals from blocking the urea mixer.