A device for controlling an exhaust sound of a vehicle includes a sound tunnel mounted near a muffler and an exhaust pipe so as to transmit exhaust sound to an interior of a vehicle, a sound introduction hole formed in the sound tunnel, and a catalytic assembly mounted in the sound tunnel so as to clog the sound introduction hole, the catalytic assembly functioning to reduce high-frequency noise and to filter exhaust gas, thereby reducing high-frequency noise included in the exhaust sound transmitted to the interior of the vehicle and thereby filtering the exhaust gas so as to prevent introduction of the exhaust gas into the interior of the vehicle.

An exhaust muffler includes a first muffler section connected to an exhaust pipe and a second muffler section connected to the first muffler section. Exhaust gases delivered from the exhaust pipe are discharged from the first muffler section and the second muffler section out of the exhaust muffler. The first muffler section includes a tubular member made up of an inner pipe to which the exhaust pipe is connected and an outer pipe covering the inner pipe, and a connector connecting the tubular member and the second muffler section to each other. The first muffler section has a first expansion chamber defined therein between the inner pipe and the outer pipe. The inner pipe houses therein a valve for changing an amount of exhaust gases passing through the inner pipe. The first muffler section includes a curved portion that is curved vertically as viewed in side elevation of the vehicle. The exhaust muffler has a second expansion chamber defined in the second muffler section rearward and upward of the first muffler section, the second expansion chamber having a cross-sectional area larger than a cross-sectional area of the first expansion chamber. There is thus provided an exhaust device for an internal combustion engine, which includes a muffler compact in a longitudinal direction thereof.

An exhaust system for an off road vehicle includes a main intake pipe running in a generally longitudinal direction on the vehicle, receiving gasses from a first intake pipe for a forward cylinder and from a second intake pipe for a rearward cylinder of an mid-mounted internal combustion engine. A catalytic converter receives gasses from the main intake pipe. Instead of being mounted longitudinally, the catalytic converter extends in a transverse direction, at the rearward end of the exhaust system, behind the axis of the rear wheels. A muffler, located over the axis of the rear wheels, also extends in a transverse direction and receives gasses from the catalytic converter. The muffler outputs the gasses through a tailpipe, which is preferably above and extends wider than the main intake pipe.

An exhaust system for an internal combustion engine of a motor vehicle includes a single exhaust-gas inlet line, two exhaust-gas outlet lines connected in an exhaust gas-conducting manner to the exhaust-gas inlet line, and an active silencing device. The active silencing device is connected in a sound-conducting manner to the two exhaust-gas outlet lines. Furthermore, a motor vehicle with such an exhaust system is provided.

The present invention relates to an apparatus for increasing the flow rate in an engine pipe, and a processing method therefor and, more specifically, to an apparatus for increasing the flow rate in an engine pipe, the apparatus being provided in an engine pipe so as to define a circular flow of a gas by maximizing a circular flow length of the flowing gas, enabling the gas to flow circularly along an outer surface of a flow rate increasing tube body, preventing the occurrence of a vortex due to the collision of the gas flowing in the inside and the outside of the flow rate increasing tube body, and preventing the occurrence of noise and the like since the flow rate increasing tube body is firmly fixed to the pipe.

Provided is a tail pipe in which a silencing effect at a discharge port is obtained. One aspect of the present disclosure is a tail pipe including: an inner tube including a discharge port configured such that an exhaust gas is discharged therefrom; an outer tube arranged so as to form a space between the outer tube and the inner tube by surrounding an outer peripheral surface of the inner tube, an upstream end of the outer tube in a flow direction of the exhaust gas being closed; and at least one communication hole allowing communication between an interior of the inner tube and the space.

A high-frequency resonator forming a flow passage for an air induction system, includes an outer shell having a cylindrical inner surface at a first radial distance from a centerline, and an inner shell positioned within the outer shell and forming a volume therebetween. The inner shell includes a first cylindrical outer surface positioned at a second radial distance from the centerline, the first cylindrical outer surface forming an inner surface of the volume and having a first plurality of resonator openings, and a cylindrical support structure having a second cylindrical outer surface positioned at a third radial distance from the axial centerline, and having hydrocarbon adsorber openings. The resonator includes a hydrocarbon adsorber positioned over the cylindrical support structure, such that an inner surface of the hydrocarbon adsorber is exposed to the flow passage through the hydrocarbon adsorber openings. The third radial distance is less than the first radial distance.

A high-frequency resonator forming a flow passage for an air induction system, includes an outer shell having a cylindrical inner surface at a first radial distance from a centerline, and an inner shell positioned within the outer shell and forming a volume therebetween. The inner shell includes a first cylindrical outer surface positioned at a second radial distance from the centerline, the first cylindrical outer surface forming an inner surface of the volume and having a first plurality of resonator openings, and a cylindrical support structure having a second cylindrical outer surface positioned at a third radial distance from the axial centerline, and having hydrocarbon adsorber openings. The resonator includes a hydrocarbon adsorber positioned over the cylindrical support structure, such that an inner surface of the hydrocarbon adsorber is exposed to the flow passage through the hydrocarbon adsorber openings. The third radial distance is less than the first radial distance.

Power systems and enclosures having improved cooling air flow are disclosed. An example power system includes an enclosure; an air inlet location at a first location on an exterior of the enclosure to permit intake of air from the exterior of the enclosure to an interior of the enclosure; an air exhaust location at a second location on the exterior of the enclosure to exhaust the air taken in through the air inlet location; and an air routing path defined by the enclosure to direct the air from the air inlet location to the air exhaust location, in order: through one or more first compartments in the enclosure, the one or more first compartments containing at least one of a compressor, a generator, or power conversion circuitry; and through one or more second compartments, the one or more second compartments comprising an engine and a muffler.

Certain embodiments of the present disclosure provide an acoustic inlet barrel of an engine. The acoustic inlet barrel may include an inner barrel configured to provide a boundary for directing airflow through the engine. The inner barrel may include an inner face sheet separated from an outer face sheet by an acoustic core. The inner barrel may include a plurality of elongated, non-circular perforations formed through the inner face sheet.