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Methods for controlling and making particle filtering devices

A technology of particulate filter and filter, which is applied in the direction of electric control of exhaust treatment device, diagnostic device and measuring device of exhaust treatment device, etc.

Inactive Publication Date: 2010-09-29
SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, a weak correlation between the measured pressure drop and the actual accumulated soot mass, or especially when driving in an urban environment or in case of technical engine problems underestimates the amount of soot emitted outside the combustion chamber , may be a problem
One solution to this problem could be to increase the regeneration frequency, which by any means has the drawback of increasing fuel consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0066] The present invention will be better understood through the specific description of the following specific examples.

[0067] Recrystallized silicon carbide (R-SiC) fibers composed of an assembly of parallel cubical monolithic elements with a honeycomb structure are obtained according to the following process: the elements are extruded and subsequently baked at more than 2000 °C , and finally assembled using a silicon carbide-based bonding agent. The structure obtained is then machined to give it a cylindrical shape with a circular base, after which it is covered with cement. The filter thus produced had a diameter of 14.38 cm and a length of 25.4 cm. The channel density of the monolithic element is 31 channels / cm2. The manufacture of such filters is described, for example, in patent applications EP-A-816 065 or EP-1-1 142 619 .

[0068] Such soot density limits of the filters were measured according to the protocol defined above using 12 filters of the same nature i...

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PUM

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Abstract

The invention concerns a method for controlling the robustness of a particulate filter for use on a Diesel engine exhaust line, including the following steps which consist, after previously determining the threshold weight of soot of said filter, in loading a new filter with a soot level not less than twice and not more than three times said threshold weight of soot, then, in any order, determining the efficacy of said filter, measuring its pressure loss and comparing same to the pressure loss of the new filter, measuring its cracking level, and finally controlling its integrity after mechanical biasing. The invention also concerns a method for diagnosing the robustness of a filter.

Description

technical field [0001] The invention relates to the field of particulate filters used in the exhaust lines of diesel engines for the removal of soot produced by the combustion of fuel. The invention relates in particular to methods for controlling and diagnosing the thermomechanical properties of such a filter, and also to methods for manufacturing particulate filters. Background technique [0002] Diesel engines are known to produce large amounts of soot. This results from the thermal cracking of hydrocarbons in the absence of oxygen in the very center of the combustion flame, and the insufficient temperature in the combustion chamber to burn all the soot particles thus produced. This soot, when expelled outside the vehicle, acts as grains on which unburned hydrocarbons condense, thus making up solid particles that can be inhaled and whose fine particle size allows them to enter directly into the alveoli. [0003] In order to limit the emission of soot to the outside of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00F01N3/023G01M99/00
CPCF01N11/00F01N2550/20Y02T10/47F01N3/023F01N2550/04Y02T10/40
Inventor S·巴顿V·M·格莱泽P·J·D·吉罗特
Owner SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN