| US 7,537,633 B2 | ||
| Filter unit for filtering particles contained in exhaust gas of an internal combusting engine | ||
| Sébastien Bardon, Lyons (France) | ||
| Assigned to Saint-Gobain Centre de Recherches et d'Etudes Europeen, Courbevois (France) | ||
| Appl. No. 10/564,838 PCT Filed Jul. 15, 2004, PCT No. PCT/FR2004/001855 § 371(c)(1), (2), (4) Date Jan. 17, 2006, PCT Pub. No. WO2005/016491, PCT Pub. Date Feb. 24, 2005. |
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| Claims priority of application No. 03 08776 (FR), filed on Jul. 18, 2003. | ||
| Prior Publication US 2006/0168928 A1, Aug. 03, 2006 | ||
| Int. Cl. B01D 46/00 (2006.01); F01N 3/022 (2006.01) | ||
| U.S. Cl. 55—523 [55/282.2; 55/282.3; 55/385.3; 55/482; 55/484; 55/524; 55/DIG. 5; 55/DIG. 10; 55/DIG. 30; 60/311; 428/116] | 12 Claims |
| 1. A filter unit for filtering particles contained in exhaust gases of an internal combustion engine, comprising:
interleaved sets of adjacent inlet passages (10, 11) and outlet passages (12, 13) in fluid communication through lateral walls of said inlet passages (10, 11) and said outlet passages (12, 13),
said unit including a set of lateral wall portions (161-168) forming an intermediate wall (15) between said inlet passages (10, 11) and said outlet passages (12, 13) and having, in cross section, an undulation determined to increase an overall volume of said inlet passages (10, 11) at an expense of an overall volume of the outlet passages (12, 13), and the overall volume (Ve) of said inlet passages (10, 11) being greater that the overall volume (Vs) of said outlet passages (12, 13), wherein,
a hydraulic diameter of said outlet passages (12, 13) is from 0.9 to 1.4 mm,
a ratio r of the overall volume (Ve) of the inlet passages (10, 11) to the overall volume (Vs) of the outlet passages (12, 13) is from 1.15 to 4,
a filtering area is from 0.825 m2 to 1.4 m2 per liter of said filter unit, and
a ratio of asymmetry of said undulation is less than 15% and greater than 5%.
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