A snap-action valve assembly for an exhaust system and a method for manufacturing the same is provided. The valve assembly includes a first conduit and a second conduit that is partially received in the first conduit. A valve flap is disposed within the first conduit for controlling exhaust flow. A shaft supports the valve flap in the first conduit for rotation between open and closed positions. The first conduit has first and second slots, each extending from an open slot end to a closed slot end. First and second bushings subassemblies supporting the shaft are disposed within the slots between the second conduit and the closed slot ends. Each of the first and second bushing subassemblies includes an alignment system in the form of protrusions that limit insertion of the first and second bushing subassemblies into the first and second slot to a single orientation.

Methods and systems are provided for operating an engine exhaust aftertreatment system to increase the efficiency of an exhaust underbody catalyst and reduce engine emissions. In one example, a bypass passage may be coupled to a main exhaust passage and during conditions which may adversely affect functionality of the underbody catalyst, exhaust may be opportunistically routed via the bypass passage avoiding the underbody catalyst. Exhaust heat may be recovered via a heat exchanger coupled to the bypass passage, and the heat may be used for engine heating, and passenger cabin heating.

An exhaust system for an internal combustion engine is provided. The exhaust system includes an exhaust manifold receiving exhaust gas from a cylinder, an emission control device positioned downstream of the exhaust manifold, an electric heating device positioned in an exhaust line upstream of the emission control device and downstream of the exhaust manifold, the electric heating device including a frame at least partially surrounding a heating element, and an adjustment device configured to, during operation of the internal combustion engine, adjust the drag generated by the electric heating device in an exhaust gas flow through the exhaust line.

A housing for fluidically connecting an exhaust gas line to an exhaust gas heat exchanger, wherein the main flow channel of the housing extends in the direction of a central axis (X), from an inlet opening to an outlet opening, with an average flow cross section (SQ). In the main flow channel, at least one opening is provided in the housing for a valve shaft, and on the housing, at least one bypass opening formed by a connecting piece is provided between the inlet opening and the outlet opening. The housing is formed by a maximum of two deep-drawn sub-shells made of sheet metal, wherein the connecting piece is formed circumferentially around the bypass axis (Y) for connecting an exhaust gas heat exchanger via the upper shell and/or via the lower shell.

An exhaust gas system for an engine producing an exhaust gas includes an exhaust gas tube configured to receive the exhaust gas. A particulate filter is in fluid communication with the exhaust gas tube and configured to undergo thermal regeneration when the exhaust gas in the particulate filter is heated above a regeneration temperature. A generator unit is positioned downstream of the particulate filter and includes a first catalyst. A tank is configured to store a precursor material. The generator unit is configured to employ the precursor material and the heat generated for the thermal regeneration of the particulate filter to generate an ammonia gas from the precursor material. The system includes a controller having a processor and tangible, non-transitory memory on which is recorded instructions for executing a method of controlling generation of ammonia gas in the generator unit and injection of ammonia gas in the exhaust gas tube.

A vehicle exhaust system includes an exhaust component having an outer surface and an inner surface that defines an internal exhaust component cavity. At least one hole is formed in the exhaust component to extend through a wall of the exhaust component from the outer surface to the inner surface. A member is formed from a resistive material and is configured to overlap the at least one hole. At least one spacer is configured to space the member away from the inner or outer surface of the exhaust component to create an open cavity between the member and the exhaust component. In one example, an actuator is configured to cover and uncover the member dependent upon an operating characteristic to vary damping.

Provided is an exhaust flow tube system for use with emissions test equipment, the system comprising: a primary flow tube configured to receive exhaust gases from an engine exhaust pipe and to deliver the exhaust gases to emissions test equipment; a secondary flow tube configured to receive exhaust gases from the engine exhaust pipe and to deliver the exhaust gases to the emissions test equipment; a valve configured to control the flow of exhaust gases through the secondary flow tube; and a control system configured to receive a signal indicative of the flow rate or likely flow rate of exhaust gases from the engine exhaust, and to control the operation of the valve to alter the flow of exhaust gases through the secondary flow tube dependent on the signal.

A flapper exhaust diverter valve (110) is provided. The flapper exhaust diverter valve (110) includes a valve body (210) comprising an exhaust inlet (212), an evaporator outlet (214), and a bypass outlet (216). The flapper exhaust diverter valve (110) also includes a flapper assembly (310) that is rotatably coupled to the valve body (210) at a first distal end (310a) of the flapper assembly (310).

A valve unit comprises a valve (7) having a valve shaft (30) with a rotational axis, an actuator (6) for, the actuator having an actuator shaft (20) with a rotational axis, a mechanical coupler (1) for rotational coupling of the actuator shaft (20) and the valve shaft (30), the mechanical coupler (1) comprising a rotational axis (10) coinciding with the rotational axis of the actuator shaft (20) and the rotational axis of the valve shaft (30), a first rotational member (2) coupled to the actuator shaft (20) and a second rotational member (3) coupled to the valve shaft (30), and a bridge element (4), the first and the second rotational members (2, 3) having slots (21, 31) for receiving engagement pins (41) of the bridge element (4). The bridge element (4) has a planar shape extending from the first rotational member (2) to the second rotational member (3), and the planar bridge element (4) has a body (42) and at least two engagement pins (41) projecting from the body (42) at each of two of opposite ends of the body (42) of the planar bridge element (4) in a parallel direction to the rotational axis (10) of the mechanical coupler (1). The engagement pins (41) are engaging with the corresponding slots (21, 31) in the rotational members (2, 3). The planar bridge element (4) comprises at least one through-hole (43) traversing the plane of the body (42) of the planar bridge element (4) extending from the first rotational member (2) to the second rotational member (3).

An exhaust purification system for a ship includes a main path in communication with the outside and a bypass path branched from an intermediate portion of the main path, each serving as a discharge path for an engine installed in the ship. The main path and the bypass path are provided with and opened and closed by respective fluid operated switching valves of a normally open type.