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| Number | Title | Issue Date |
| 7428947 | Electrically controlled in-muffler exhaust valve for use during cylinder deactivation A powertrain control system is provided that includes an engine having multiple cylinders. A controller selectively activates the cylinders to provide a cylinder combination having a desired power displacement. In one example powertrain control system, the controlle... | 09/30/2008 |
| 7357220 | Systems and methods for controlling acoustical damping A control system (10) controls a variable acoustical damping device (20) disposed in a sound producing channel (5) of a vehicle engine (1). The control system includes a controller (12) and a selection device (14). The contr... | 04/15/2008 |
| 7337877 | Variable geometry resonator for acoustic control The present invention provides a resonator for attenuating acoustic vibration from an air intake passage. The resonator includes a neck, a resonator chamber, a piston-type member, and an actuator. The neck is attached between the air passage and the resonator chambe... | 03/04/2008 |
| 7328586 | Repositionable attenuator A repositionable attenuator for a terminal unit in a heating, ventilation, and air conditioning system is disclosed. The attenuator is positionable between at least a first and a second position. This enables the attenuator to be attached to and shipped with the ter... | 02/12/2008 |
| 7325474 | Silencer The present invention relates to a silencer easily cleanable inside. This silencer comprises a casing cylinder and a segment member housed in the casing cylinder to constitute a sound reducing means. The silencer further comprises a segment member fastening means fo... | 02/05/2008 |
| 7278514 | Acoustic noise filter An acoustic filter is provided with a single flow chamber for exposure of a flexible rubber layer to liquid undergoing flow through the flow chamber with noise producing acoustic energy therein. The flexible rubber layer is supported on a cylindrical drum with slant... | 10/09/2007 |
| 7258196 | Noise attenuator with laterally moving baffles A silencer or sound attenuator for gas flows that makes use of noise baffles is provided with a lateral movement mechanism which allows the baffles to be moved perpendicular to the direction of the gas flow within the silencer. A silencer provided with the lateral m... | 08/21/2007 |
| 7198062 | Fluid control valve A valve is provided for controlling a flow of a fluid between a first environment and a second environment. The valve includes a frame adapted to fit within a perimeter of an aperture in a divider separating the first environment from the second environment. The val... | 04/03/2007 |
| 7117974 | Electronically controlled dual chamber variable resonator An in-line resonator for an air induction system of an internal combustion engine is provided. The system includes a resonator housing, an upstream duct, a downstream duct, a conduit, a partition, and a sleeve. The conduit extends through the resonator housing conne... | 10/10/2006 |
| 7107974 | Apparatus and method for increasing the ratio of air to fuel of engine An apparatus and method for increasing the ratio of air to fuel of engine is disclosed. The method comprises the steps of providing air to fuel injection mechanism by fan; adjusting the speed of fan by the voltage generated by the generator a car so that the corresp... | 09/19/2006 |
| 7073626 | Engine exhaust muffler with guide vanes imparting a successively alternating spiral swirl gas flow A muffler has a housing (2) through which exhaust gas flows and which has at least one housing chamber (3, 5) and in which deflecting elements (13 to 16) serving to make the gas swirl are arranged spaced one behind another along a main ax... | 07/11/2006 |
| 7055648 | Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes An assembly useful in reducing aircraft engine noise such as turbofan engine noise (730) comprises: (i) at least one tube “H-Q” having an inlet end (738), an outlet end (740) and a central tube portion therebetween; and (ii) at least one act... | 06/06/2006 |
| 6941751 | Exhaust muffler and muffler system for use with an internal combustion engine An exhaust muffler system for use on a motorcycle or four-wheeled vehicle provides for operation in either of two modes, a regular configuration that provides a high degree of noise reduction, or a racing specification that provides for a freer-flowing exhaust. With... | 09/13/2005 |
| 6915876 | Exhaust processor with variable tuning system An exhaust processor comprises a Helmholtz resonance chamber with a variable tuning throat. The tuning frequency of the exhaust processor changes as the outlet opening from the variable tuning throat into the Helmholtz resonance chamber changes. ... | 07/12/2005 |
| 6810992 | Sound producing vehicle exhaust system A sound producing vehicle exhaust system comprises a housing positionable over an exterior end of a vehicle tailpipe. A turbine has at least one support plate. The support plate is rotatable about a central axis of rotation with the housing and has a plurality of an... | 11/02/2004 |
| 6732509 | Engine acoustical system A number of embodiments of acoustical devices for improving either or both the intake and exhaust sounds emanated from an internal combustion engine. This is achieved by employing acoustical devices which are configured so as to discharge the desired sound waves to ... | 05/11/2004 |
| 6732510 | Exhaust processor with variable tuning system An exhaust processor comprises a Helmholtz resonance chamber with a variable tuning throat. The tuning frequency of the exhaust processor changes as the outlet opening from the variable tuning throat into the Helmholtz resonance chamber changes. ... | 05/11/2004 |
| 6634457 | Apparatus for damping acoustic vibrations in a combustor An apparatus for damping acoustic vibrations in a combustor as well as a corresponding combustor arrangement with the apparatus. The apparatus includes a Helmholtz resonator (4) that can be connected via a connecting channel (2) with a combustor (1). The ... | 10/21/2003 |
| 6622819 | Sound attenuator for pneumatic exhaust The present invention provides a sound attenuator for pneumatic exhaust that includes a body having an open end and an inner cavity defined by an inner wall, an inlet port provided in the body adapted to establish fluid communication between a source of p... | 09/23/2003 |
| 6609590 | Exhaust system having angled baffle In-line exhaust systems comprise an exhaust pipe, and a sound-attenuating baffle in the exhaust pipe. The baffle has one or more baffle plates extending across the gas flow channel, at least one at an oblique angle. Each plate has an array of apertures th... | 08/26/2003 |
| 6554100 | Vehicle muffler system A submuffler for a vehicle muffler system which comprises a housing, a pressure-reducing conduit disposed within said housing, said pressure-reducing conduit containing a plurality of apertures disposed on the surface thereof, an eddy-generating member di... | 04/29/2003 |
| 6508331 | Variable resonator A resonator provided for air system that includes a body defining a passageway. A wall is disposed within the chamber and the wall and the chamber are movable relative to one another to define a length and a volume of the cavity. The length and the volume... | 01/21/2003 |
| 6367580 | Sound adjustable tail pipe structure A sound adjustable tail pipe structure includes an adjuster secured in a rear section of a tail pipe which defines a first oblong slot. The adjuster includes a tube having a first end provided with a first positioning base and a second end provided with a... | 04/09/2002 |
| 6343673 | Turbine exhaust structure for vehicle A turbine exhaust structure is provided for a vehicle which includes an exhaust tail pipe having an inner wall defining a screw hole. The turbine exhaust structure includes a turbine exhaust device secured in the inner wall of the exhaust tail pipe, and a... | 02/05/2002 |
| 6167699 | Secondary air injection system for an internal combustion engine A secondary air injection system for reducing the hydrocarbon emissions of an internal combustion engine that is provided with an air pump supplying air to the exhaust manifold of the engine through a check valve assembly and an elastomeric hose character... | 01/02/2001 |
| 6050284 | RV generator auxiliary exhaust system method An auxiliary exhaust system is provided for releasable attachment to internal combustion engines as are used on electrical generators of recreational vehicles or the like. The auxiliary exhaust system is easy to assemble and disassemble and directs combus... | 04/18/2000 |
| 5884666 | Exhaust pipe extension An exhaust pipe extension having movable fan blades mounted on a center axle which blades and part of the axle extend into an opened vehicle exhaust pipe. The other end of the same axle is fixed connected to a rotatable end decorative visual spinner withi... | 03/23/1999 |
| 5872342 | Free rotor muffler A free rotor is mounted to spin freely in a conduit network that is acoustically coupled to a noise source through a working fluid that flows through the conduit network. The free rotor muffles the acoustic perturbations travelling through the conduit net... | 02/16/1999 |
| 5655367 | Inlet or exhaust line for a reciprocating machine An inlet or exhaust line for a reciprocating machine attenuates the sound level of the machine while being simple and economical to produce. A sensor measures the instantaneous flow rate of gases passing through the line while a restriction device variabl... | 08/12/1997 |
| 5489753 | Static dissipative muffler An auto-adjusting damper assembly for an air muffler, such assembly including a spring loaded damper plate located above an outlet hole for transferring some of the energy of incoming air into a mechanical movement of such damper.... | 02/06/1996 |
| 5129792 | Refrigerant compressor having gas pulsation suppression device A variable displacement wobble plate type refrigerant compressor includes a plurality of axially reciprocating pistons. A drive shaft rotates the wobble plate and thereby reciprocates the pistons within their respective compression chambers. Gaseous refri... | 07/14/1992 |
| 5074376 | Noise reduction method When there is relative movement, at a speed above a critical value, between the trailing edge of a body, such as a hydrofoil or aerofoil section, and a fluid, the fluid flow tends to form a pattern of discrete swirling vortices. Vortex shedding at each si... | 12/24/1991 |
| 5027919 | Fluid friction controller A fluid friction controller that includes an outer member having a first friction control surface and an inner member having a second friction control surface. The control surfaces coact to define an elongated orifice that diverges from its entrance towar... | 07/02/1991 |
| 4969536 | Turbocharger noise silencer A charge air system for an internal combustion engine includes a compressor wheel which is rotated to draw ambient air into a housing, compress the air, and to force the air through a discharge conduit into the the intake manifold of an internal combustio... | 11/13/1990 |
| 4903486 | Performance responsive muffler for internal combustion engines A muffler responsive to exhaust flow rate is provided for an internal combustion engine. The muffler includes a body having a variable restrictor located downstream from an inlet port and upstream from an outlet port of the muffler. The variable restricto... | 02/27/1990 |
| 4688472 | Noise reduction spoiler for a damper A spoiler is located on the damper blade of a damper assembly such that it serves to divert the flow from the hinge area to avoid air separation. Further, the spoiler does not define the most restricted portion of the flow path and thereby has a minimal e... | 08/25/1987 |
| 4616732 | Silencing system for exhaust gases from internal combustion engines A silencing system for exhaust gases from internal combustion engines, comprising an intermediate silencing device for connection to the exhaust manifold of an internal combustion engine, and a final silencing device series connected to the intermediate s... | 10/14/1986 |
| 4428453 | Exhaust silences for internal combustion engines A silencer comprises a chamber with internal baffles mounted on a rod so that they can be manually reciprocated to scrape deposits off the chamber wall. A head at an end of the rod protruding from the chamber is screwable to a chamber end wall to hold the... | 01/31/1984 |
| 4327815 | Rotational mechanism disposed within fluid passageway A rotational mechanism to be disposed midway in a fluid passage may be utilized in a silencer, rotary pump, or the like. The mechanism is essentially provided with a casing defining a spherical chamber, a pair of shafts respectively having axes passing th... | 05/04/1982 |
| 4236598 | Rotating self-cleaning sound absorber for ducts A sound absorbing structure for a flow duct composed of a bundle of parallel, terminated, acoustical waveguides. The bundle of waveguides is cut obliquely so that the individual waveguides vary substantially in length along the cut. The bundle is arranged... | 12/02/1980 |
