Abstract:
The invention relates to an exhaust gas purification system applied to an internal combustion engine. The engine has a turbocharger (40) including a turbine wheel (45) and a housing (42H) for housing the turbine wheel. The housing defines a turbine outlet passage (44) communicating with an exhaust gas discharging part (49) of the turbine wheel. The engine further has an exhaust passage part (34) communicating with an exhaust gas outlet (44O) of the turbine outlet passage. The system comprises an exhaust gas purification apparatus disposed in the exhaust passage part at a position adjacent to the exhaust gas outlet of the turbine outlet passage. Further, the apparatus includes an exhaust gas purification member (51). The member is provided such that its density in a peripheral part (34P) of the exhaust passage part is larger than that in a central part (34C) of the exhaust passage part and a flow passage resistance per unit volume of the member at an area of the central part of the exhaust passage part is smaller than that at an area of the peripheral part of the exhaust passage part.
Abstract:
The present invention allows tailoring the filter design for optimal engine performance by providing the desirable ratio of greater than one, without necessitating an increase of the overall filter volume and without decreasing filter efficiency. Moreover, the present invention allows an increase in the ratio, while at the same time reducing, the overall filter volume, or in other words, providing smaller filter volume for a given ratio. In addition, the present invention preserves Identical inlet channel surface and outlet channel surface areas, while having the ratio value of greater than one. These advantages achieved by having unique geometry of the cross-sectional area of the inlet and outlet channels, where both channels have the same perimeter length in every embodiment of the invention. The present invention provides continuous variability in the selection of the ratio values which is not constricted by the geometry or other consideration, thereby better addressing the specific needs of various engines, and allowing fine tuning of optimal balance between the high soot capacity and low pressure drop requirements.
Abstract:
The invention relates to a structure for filtering particle-laden gases, of the honeycomb type and including an assembly of longitudinal adjacent channels with parallel axes and separated by porous filtration walls, in which: each outlet channel has a wall that is common with six inlet channels, each common wall defining a side of said outlet channel; each outlet channel includes six sides having a substantially identical width a in order to define a channel having a substantially hexagonal and uniform section; at least two adjacent sides of each inlet channel have a different width; and at least two inlet channels sharing a wall with a same outlet channel, share a common wall having a width b, wherein the ratio between the widths b/a is higher than 0 and lower than 1.
Abstract:
An apparatus, system, and method are disclosed for dispersing heat within a particulate filter 110. The apparatus may include various devices for dispersing heat from a high risk portion of the particulate filter 110 by delaying heat generation, by conducting generated heat out of the high risk portion, by absorbing the heat generated into molecular energy rather than temperature, by shifting some of the heat burden away from the particulate filter 110 to other devices in an aftertreatment system 106, or out of the aftertreatment system 106. The delaying device may be a reduction of catalyst loading within portions of the particulate filter 110. The conducting device may be a plurality of thermal conduits 308 within portions of the particulate filter 110. The absorption device may be a high heat capacity washcoat 306 in portions of the particulate filter 110.