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Diesel particulate filter system with meta-surface cavity

一种微粒过滤器、过滤器的技术，应用在膜过滤器、分散颗粒过滤、机器/发动机等方向，能够解决目标热点和冷点、不符合微粒过滤器再生的要求等问题，达到提高均匀性的效果

Inactive Publication Date: 2007-10-24
GENERAL MOTORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a challenge with microwave-frequency radiation is the achievement of uniform temperature distribution across the target material
that is, the use of microwave-frequency radiation can easily cause target hot and cold spots
As mentioned above, this non-uniformity is generally not acceptable for particulate filter regeneration
Moreover, the environment of particulate filters in diesel exhaust systems presents challenges regarding space utilization and cost constraints
Suitable systems for diesel exhaust filter regeneration based on microwave heating are no longer considered effective

Method used

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  • Diesel particulate filter system with meta-surface cavity
  • Diesel particulate filter system with meta-surface cavity
  • Diesel particulate filter system with meta-surface cavity

Examples

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Embodiment Construction

[0013] The several figures will now be numbered, wherein like parts are given corresponding reference numerals throughout the several figures, to the extent permissible. In FIG. 1 , a diesel particulate filter device 10 is shown disposed along an exhaust gas flow path downstream from a diesel engine (not shown). The direction of air flow is shown in the figure with arrows indicating direction. According to the illustrated construction, the diesel particulate filter comprises a cavity portion 12 for accommodating a porous ceramic filter 14 and a microwave-absorbing material 16 disposed substantially across a cross-section of the filter 14 at Embed contact relationships. The microwave-absorbing material 16 may be any known substance or combination that can undergo heating when exposed to microwave radiation. For example, such materials may include SiC (silicon carbide), ITO (indium tin oxide), various ferrites, etc., materials known to those skilled in the art.

[0014] As sh...

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Abstract

A diesel particulate filter including a microwave-absorbing target housed within a waveguide cavity lined along the walls with a hard-electromagnetic surface (HES). The HES modifies specific electromagnetic boundary conditions for a given design frequency so as to enable the establishment of electromagnetic field patterns which are more uniform across the cavity thereby causing the target material to undergo enhanced uniformity heating. The heating of the microwave absorbing media causes particulate buildup to be vaporized and removed from the filter by the exhaust stream flow.

Description

technical field [0001] The present invention relates generally to diesel particulate filter systems and, more particularly, to diesel particulate filter systems utilizing ceramic filters to capture particulate-laden exhaust gas in combination with localized microwave absorbing media disposed proximate particulate accumulation regions within the ceramic filters. A cavity housing the ceramic filter and microwave absorbing medium is adapted to receive an input signal of microwave-frequency electromagnetic radiation to establish a field profile such that the target absorbing medium is heated substantially uniformly. Background technique [0002] It is known to utilize ceramic filters to capture particulates entrained in diesel engine exhaust streams. During operation, this ceramic diesel particulate filter receives the exhaust flow at one end and traps particulates as the exhaust diffuses through thin channel walls, and is expelled at the other end. Continued accumulation of pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/00F01N3/028
CPCF01N3/0222B01D2279/30F01N2330/06B01D46/10Y10S55/10B01D46/0063F01N3/028B01D2273/22B01D46/84
Inventor D·J·格雷戈伊雷W·S·威廉森K·W·柯比A·菲尔普斯D·F·西文皮珀
Owner GENERAL MOTORS CORP
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