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Exhaust gas purifying apparatus

A technology of exhaust purification device and exhaust pipeline, which is applied in the direction of exhaust device, electric control of exhaust treatment device, diagnostic device of exhaust treatment device, etc., and can solve problems such as fuel efficiency reduction, engine damage, overpressure, etc. , to achieve the effect of suppressing the reduction of fuel efficiency and preventing uneven deposition

Inactive Publication Date: 2008-04-23
IBIDEN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this particulate matter deposit is ignored, the exhaust can cause overpressure in the diesel particulate filter, which can lead to reduced fuel efficiency or damage to the engine

Method used

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Experimental program
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Effect test

no. 1 approach

[0081] FIG. 6 shows the configuration of the exhaust purification device 20 according to the first embodiment of the present invention.

[0082] Referring to Figure 6, exhaust gas from a diesel engine not shown flows via exhaust line 21 into a main diesel particulate filter (DPF) 22 similar to that previously explained with reference to Figure 2A, and as explained with reference to Figures 2C and 2D Yes, the main diesel particulate filter (DPF) 22 collects particulate matter from the exhaust.

[0083] 6, from the upstream side of the main diesel particulate filter (DPF) 22, the auxiliary exhaust line 21A is branched from the exhaust line 21, and a volume smaller than that of the main diesel particulate filter is provided for the auxiliary exhaust line 21A. The secondary diesel particulate filter 22A of the filter (DPF). In addition, a differential pressure gauge 22B is provided for measuring the differential pressure ΔP caused between the inlet and outlet of the sub diesel pa...

no. 2 approach

[0117] FIG. 10 shows a flowchart of an exhaust purification method using the exhaust purification device of FIG. 6 according to a second embodiment of the present invention.

[0118] 10, in step 1, the flow rate in the secondary exhaust line 21A is set to a predetermined value in the range of 50 to 6000 ml / min by using the flow meter 24 (or in some cases, the valve 23), and the flow rate is set by the differential pressure Table 22B to detect the differential pressure ΔP across the secondary diesel particulate filter 22A. In addition, the temperature of the exhaust gas is detected by the temperature measuring portion T1.

[0119] Next, in step 2, the layer thickness W of the particulate matter collected by the sub diesel particulate filter 22A is obtained from the differential pressure ΔP detected in step 1 according to the formula (1). It should be noted here that the temperature T of the exhaust gas can be obtained using the temperature measuring section T2 of the main dies...

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Abstract

An exhaust gas purifying apparatus includes a primary diesel particulate filter provided in an exhaust line of a diesel engine, a secondary exhaust line branched from the exhaust line from an upstream side of the primary diesel particulate filter, and a secondary diesel particulate filter provided in the secondary exhaust line. The secondary diesel particulate filter has a soot storage capacity smaller than the soot storage capacity of the primary diesel particulate filter. The apparatus further includes a differential pressure measuring part measuring a differential pressure between an inlet and an outlet of the secondary diesel particulate filter. A distance to the secondary diesel particulate filter from a branching point of the secondary exhaust line from the primary exhaust line is about 2 m or less.

Description

technical field [0001] The present invention generally relates to an exhaust purification device of an internal combustion engine, and more particularly, to an exhaust 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 diesel particulate filter made of porous ceramics is used to collect particulate matter mainly composed of C (carbon) emitted from a diesel engine. For this kind of diesel particulate filter, as it continues to be used, there will be a gradual deposition of particulate matter. Therefore, in the prior art of exhaust purification devices using diesel particulate filters, it is actually through the The combustion process is periodically initiated within the DPF and the DPF is regenerated to remove deposited particulate matter. If this particulate matter deposit is ignored, the exhaust gas can cause overpressure in the diesel p...

Claims

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Application Information

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IPC IPC(8): F01N3/021F01N3/023F01N13/00
CPCF01N3/0222F01N9/002F01N2340/02F01N2560/05F01N13/04F01N3/027F01N11/002F01N3/023Y02T10/47F01N13/008G01N15/0618F01N2560/07F01N13/011Y02T10/40F01N3/021F01N13/08
Inventor 阿萨纳西奥斯·G·坎斯坦多普罗斯
Owner IBIDEN CO LTD
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