In one aspect, a system is provided and includes an engine including an exhaust valve, an exhaust manifold downstream of the exhaust valve and a muffler downstream of the exhaust manifold. The system also includes a catalyst positioned downstream of the exhaust valve.

A pulse exhaust pipe for use with diesel engines an end of the pulse exhaust pipe is in communication with eight cylinders, and another end is in communication with two turbochargers; the pulse exhaust pipe includes three exhaust pipe sections which are separated from each other, each exhaust pipe section discharging to a turbocharger independently, wherein a first exhaust pipe section is in communication with a first and second cylinder, while a second exhaust pipe section is in communication with a third to a sixth cylinder, and a third exhaust pipe section is in communication with a seventh and eighth cylinder. The pulse exhaust pipe may prevent the backward flow of exhaust gas and inlet air back flow, thus increasing inflation efficiency and improving the uniformity of each cylinder. Also provided is a diesel engine installed with said pulse exhaust pipe.

A system for regulating performance characteristics of a vehicle includes an engine configured to output an exhaust gas. The system further comprises an emissions system in fluid communication with the engine, the emissions system configured to clean the exhaust gas. The system further comprises a valve system in fluid communication with the emissions system, the valve system configured to regulate a flow of the exhaust gas. The valve system comprises a vane movable between a forward open position, a closed position, and a rear open position. The valve system further comprises a biasing member configured to bias the vane in the forward open position. The valve system further comprises a bypass channel configured to provide a bypass flow path for the exhaust gas to control a backpressure on the vane.

An exhaust component assembly includes a housing defining an internal passage for engine exhaust gas, at least one exhaust gas aftertreatment component within the internal passage, and at least one heater to heat the engine exhaust gas. The heater comprises a helical-shaped element with a surface that spirals about an axis for a predetermined length.

The vehicle of the present application includes a vehicle frame; a muffler supported by the vehicle frame; and a supporting unit comprising a rubber damper, located between the muffler and the vehicle frame and, connected to the vehicle frame such that the muffler is suspended from the vehicle frame and supported by the vehicle frame. The supporting unit comprises a first bracket and a second bracket on the first bracket.

An exhaust gas purification apparatus includes a three-way catalyst. The three-way catalyst includes a downstream catalyst layer and an upstream catalyst layer. The downstream catalyst layer is to be provided in an exhaust pipe. The downstream catalyst layer contains a noble metal material containing at least one of Pd, Rh, or Pt, and an OSC material containing at least ceria. The upstream catalyst layer is to be provided in the exhaust pipe closer to an engine than the downstream catalyst layer is. The upstream catalyst layer contains the noble metal material and the OSC material. The upstream catalyst layer contains the ceria at a content less than a content of the ceria in the downstream catalyst layer.

A vehicle includes an exhaust aftertreatment system for use with an automotive internal combustion engine. The system includes a reducing agent mixer configured to deliver a reducing agent for mixing with exhaust gases produced by the engine. The reducing agent mixer includes a mixing can defining an internal space, a doser configured to inject the reducing agent toward the internal space, and a reducing agent delivery device configured to direct the reducing agent into the internal space.

A water drainage assembly for an aftertreatment system comprises a first tube structured to be coupled to an outlet conduit of the aftertreatment system and has a first cross-sectional width. A second tube is disposed radially around the first tube. A first end of the second tube is coupled to a radially outer surface of the first tube. A portion of the second tube has a second cross-sectional width larger than the first cross-sectional width such that a volume is defined between the first and second tubes. A drain port is defined in the second tube proximate to the first end. The assembly is structured such that water flowing into the water drainage assembly flows into the volume defined between the first tube and the second tube and is expelled therefrom via the drain port.

Apparatuses and methods for tuning a muffler. An apparatus comprises a housing for a muffler, a first inlet pipe, and a second inlet pipe. The housing includes a coupling chamber. The first inlet pipe has a first set of physical features and carries exhaust to the coupling chamber. The second inlet pipe has a second set of physical features and carries the exhaust to the coupling chamber. The first set of physical features varies from the second set of physical features with respect to at least one physical feature such that a first sound waveform passing through the first inlet pipe and a second sound waveform passing through the second inlet pipe are uniquely tuned to thereby tune an overall sound waveform emitted by the muffler.

An exhaust component assembly includes a housing defining an internal passage for engine exhaust gas, at least one exhaust gas aftertreatment component within the internal passage, and at least one heater to heat the engine exhaust gas. The heater comprises a helical-shaped element with a surface that spirals about an axis for a predetermined length.