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Exhaust gas purifying apparatus

An exhaust gas purification device and a technology for exhaust gas, which are applied in the direction of exhaust device, muffler device, and electronic control of exhaust gas treatment device, etc., can solve the problems of ash deposition, regeneration timing error of diesel particulate filter, and inability to select detection filter arbitrarily. , to achieve the effect of inhibiting the reduction of fuel efficiency, eliminating ash deposition or cracking

Inactive Publication Date: 2011-04-20
IBIDEN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] On the other hand, this prior art has the disadvantage that, in addition to the problem of complicating its structure due to the need to provide a heater in the DPF, power consumption occurs at the time of regeneration of the DPF
However, this structure requires two equivalent diesel particulate filters and switching valves, posing a problem that the structure of the exhaust gas purification device becomes bulky
It is difficult to install such an exhaust gas purification device on a small vehicle
[0022] In addition, with the technology of US Patent 5,651,248, the regeneration of the detection filter is performed in parallel with the DPF or sequentially with the DPF, and this structure cannot arbitrarily select the timing of the regeneration of the detection filter, and there are the following Problem: Errors are prone to occur in the regeneration timing of the diesel particulate filter depending on the state of the detection filter
[0024] Furthermore, the technique of US Patent 5,651,248 has the disadvantages of: (a) ash deposition; and (b) large evaluation errors due to degradation
[0029] When deterioration of the filter or electrodes is caused, accurate measurement of electrical resistance is no longer possible, leading to errors in the assessment of the amount of deposition of particulate matter

Method used

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no. 1 approach

[0062] FIG. 6 shows the structure of the exhaust gas purification device 20 according to the first embodiment of the present invention.

[0063] Referring to FIG. 6, exhaust gas from an unshown diesel engine is made to flow into a main diesel particulate filter (DPF) 22 via an exhaust line 21, similar to that previously explained with reference to FIG. 2A, and as explained with reference to FIGS. 2C and 2D. That way, a primary diesel particulate filter (DPF) 22 collects particulate matter in the exhaust.

[0064] Furthermore, with the structure of FIG. 6, the auxiliary exhaust line 21A is branched from the exhaust line 21 from the upstream side of the main diesel particulate filter (DPF) 22, and the auxiliary diesel particulate filter is supplied to the auxiliary exhaust line 21A. 22A, which has a smaller volume than the main diesel particulate filter (DPF) 22 . In addition, a differential pressure gauge 22B for measuring a differential pressure ΔP generated between the inlet...

no. 2 approach

[0101] FIG. 10 is a flowchart illustrating an exhaust gas purification method according to a second embodiment of the present invention, which uses the exhaust gas purification device of FIG. 6 .

[0102] 10, by using the flow meter 24, or in some cases by using the valve 23, the flow rate in the auxiliary exhaust line 21A is set to a predetermined value in the range of 50-6000ml / min in step 1, and by The differential pressure gauge 22B detects the differential pressure ΔP across the auxiliary diesel particulate filter 22A. In addition, the temperature of the exhaust gas is detected by using the temperature measuring portion T1.

[0103] Next, in step 2, the layer thickness W of the particulate matter collected by the auxiliary diesel particulate filter 22A is obtained from the differential pressure ΔP detected in step 1 according to equation (1). Here, it should be noted that the temperature T of the exhaust gas may be obtained by using the temperature measuring portion T2 o...

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Abstract

The present invention provides an exhaust gas purifying apparatus which comprises a primary diesel particulate filter provided in a primary exhaust line of a diesel engine; a secondary exhaust line branched from said primary exhaust line from a branching point located at an upstream side of the primary diesel particulate filter; a secondary diesel particulate filter provided in the secondary exhaust line, the secondary diesel particulate filter having a soot load capacity smaller than the soot load capacity of the primary diesel particulate filter; a low pressure part provided in said secondary exhaust line at a downstream side of said secondary diesel particulate filter, said low pressure part providing a pressure lower than a pressure of said branching point; and a differential pressuremeasuring part measuring a differential pressure between an inlet and an outlet of the secondary diesel particulate filter.

Description

technical field [0001] The present invention generally relates to an exhaust gas purification device of an internal combustion engine, and more particularly, to an exhaust gas purification device including a diesel particulate filter (DPF) for removing particulate matter (PM) contained in exhaust gas of a diesel engine. Background technique [0002] Generally, a porous ceramic diesel particulate filter is used to collect particulate matter mainly of C (carbon) discharged from a diesel engine. With such a diesel particulate filter, a gradual deposition of particulate matter occurs with its continuous use, and therefore, in the field of exhaust gas purification devices using a diesel particulate filter, it has been implemented that by periodically Causes a combustion process to remove deposited particulate matter, thereby regenerating the diesel particulate filter. When this deposition of particulate matter is not observed, it can lead to excessive pressure in the diesel part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/021
CPCF02M25/0709G01N15/0618F01N3/027F02M25/074F01N2550/04F01N3/035F01N2560/20F02M25/0718F02M25/0707F01N3/031F01N2560/07Y02T10/47F01N9/002F01N2560/06F01N2560/08F01N13/008F01N2560/05F01N13/02F01N13/04F02M25/0754Y02T10/121F02B37/00F01N13/009F01N13/011F02M26/05F02M26/06F02M26/15F02M26/35F02M26/47Y02T10/40F01N3/021F01N3/023
Inventor 阿萨纳西奥斯·G·坎斯坦多普罗斯
Owner IBIDEN CO LTD