This invention relates to an Exhaust Bypass Valve (EBV) for diesel engines and more particularly, to a cartridge style EBV.
In general, when diesel fuel is burned in an engine, nitrogen oxides are produced in the exhaust gas. An exhaust gas recirculation (EGR) cooler provides a cooled dilutent to lower combustion temperatures and reduce the concentration of nitrogen oxides in the exhaust gases. Typically, when an engine is first started, an EBV assembly, separate from the EGR cooler, is used to bypass the EGR cooler and redirect uncooled gasses through the engine to accelerate engine warmup. These EBV assemblies must withstand high temperature and are typically complicated, with an expensive, machined housing.
With reference to
Thus, there is a need to provide a compact, replaceable and cost-effective EBV.
An object of the invention is to fulfill the need referred to above. In accordance with the principles of the present invention, this objective is obtained by providing an exhaust bypass valve cartridge for an exhaust bypass valve (EBV) assembly. The EBV assembly has a housing defining an inlet passageway and first and second passageways in communication with the inlet passageway and with each other, and a bore at a juncture of the passageways and in communication with the passageways. The cartridge includes a valve member constructed and arranged to be removably inserted into the bore of the housing, and shaft structure associated with the valve member so that rotation of the shaft structure rotates the valve member. When the valve member is in a first position, the inlet passageway communicates only with the first passageway, and when the valve member is in a second position, the inlet passageway communicates only with the second passageway.
In accordance with another aspect of the invention, an exhaust bypass valve assembly is provided for a vehicle. The assembly includes a housing defining an inlet passageway and first and second passageways in communication with the inlet passageway and with each other, and a bore at a juncture of the passageways and in communication with the passageways. The inlet passageway is constructed and arranged to receive exhaust gas from an exhaust manifold of a vehicle, the first passageway is constructed and arranged to be associated with a cooler of the vehicle, and the second passageway is constructed and arranged to be associated with an engine of the vehicle. An exhaust bypass valve cartridge includes a valve member removably disposed in the bore of the housing, and shaft structure associated with the valve member so that rotation of the shaft structure rotates the valve member. The valve member is movable between first and second positions such that when the valve member is in the first position, the inlet passageway only communicates with the first passageway so that exhaust gas can be directed to the cooler, and when the valve member is in a second position, the inlet passageway only communicates with the second passageway so that exhaust gas can be directed to the engine.
In accordance with yet another aspect of the invention, a method of providing a removable exhaust bypass valve cartridge for an exhaust bypass valve assembly of a vehicle provides a housing defining an inlet passageway and first and second passageways in communication with the inlet passageway and with each other, and a bore at a juncture of the passageways and in communication with the passageways. The inlet passageway receives exhaust gas, the first passageway is associated with a cooler of a vehicle and the second passageway is associated with an engine of a vehicle. An exhaust bypass valve is provided as a cartridge. The cartridge, includes a valve member and shaft structure associated with the valve member so that rotation of the shaft structure moves the valve member. The valve member is inserted into the bore in such a manner that the valve member is removable from the bore, with the shaft structure being accessible to be rotated such that rotation of the shaft moves the valve member to control a flow of exhaust gas from the inlet passageway through the first and second passageways.
Other objects, features and characteristics of the present invention, as well as the methods of operation and the functions of the related elements of the structure, the combination of parts and economics of manufacture will become more apparent upon consideration of the following detailed description and appended claims with reference to the accompanying drawings, all of which form a part of this specification.
The invention will be better understood from the following detailed description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings, wherein like reference numerals refer to like parts, in which:
Referring to
In the embodiment and with reference to
At a juncture 25 of the passageways 21, 24, 26, the housing 22 includes a generally cylindrical bore 28 therein so as to communicate with each of the passageways 21, 24, 26. The assembly 20 includes an EBV cartridge, generally indicated at 30, received in the bore 28. With reference to
Thus, as shown in
With reference to
Since the EBV cartridge 30 is selectively removable, a defective EBV cartridge 30 can simply be removed and replaced. Since a single valve member 32 is used instead of two conventional butterfly valves, a compact and less expensive EBV is provided.
The foregoing preferred embodiments have been shown and described for the purposes of illustrating the structural and functional principles of the present invention, as well as illustrating the methods of employing the preferred embodiments and are subject to change without departing from such principles. Therefore, this invention includes all modifications encompassed within the spirit of the following claims.
This application claims the benefit of the earlier filing date of U.S. Provisional Application No. 60/826,480, filed on Sep. 21, 2006, which is hereby incorporated by reference into this specification.
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Number | Date | Country | |
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20080072865 A1 | Mar 2008 | US |
Number | Date | Country | |
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60826480 | Sep 2006 | US |