KR20110012338A - Method for emission controlling of diesel particulate filter - Google Patents

Method for emission controlling of diesel particulate filter Download PDF

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Publication number
KR20110012338A
KR20110012338A KR1020090070022A KR20090070022A KR20110012338A KR 20110012338 A KR20110012338 A KR 20110012338A KR 1020090070022 A KR1020090070022 A KR 1020090070022A KR 20090070022 A KR20090070022 A KR 20090070022A KR 20110012338 A KR20110012338 A KR 20110012338A
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KR
South Korea
Prior art keywords
regeneration
filter
control logic
amount
smoke
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KR1020090070022A
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Korean (ko)
Inventor
권충일
Original Assignee
현대자동차주식회사
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Priority to KR1020090070022A priority Critical patent/KR20110012338A/en
Publication of KR20110012338A publication Critical patent/KR20110012338A/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00Electrical control of exhaust gas treating apparatus
    • F01N9/002Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04Methods of control or diagnosing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems

Abstract

PURPOSE: A method for controlling of a diesel smoke filter which can efficiently remove smoke with the filter is provided to secure the service life of the filter by improving the regenerate efficiency of the filter. CONSTITUTION: A method for controlling of a diesel smoke filter comprises the next step. It is determined the recycling process of a filter by predicting the soot accumulated inside a smoke filter device purifying the exhaust gas of an engine(S10). The regenerative control logic of the basis regeneration or multi-stage regeneration is decided according to the presumed soot amount(S20). The regenerative control logic comprises a basis regenerative control logic(S40) and a multi-stage regenerative control logic(S30).

Description

Method for control of diesel particulate filter {Method For Emission Controlling Of Diesel Particulate Filter}

The present invention relates to a control method of a diesel particulate filter. More particularly, the present invention relates to a regeneration method of a soot filtration device which can efficiently remove soot accumulated in a soot filtration device (DPF) for purifying exhaust gas in a diesel vehicle, thereby increasing the regeneration efficiency of the soot filtration device.

In general, the exhaust gas refers to a gas emitted from the engine of an automobile by the mixer through the exhaust pipe into the atmosphere. The exhaust gas mainly contains harmful substances such as carbon monoxide (CO), nitrogen oxides (NOx), and unburned hydrocarbons (HC).

Although diesel engine vehicles are superior in fuel economy and power output, unlike gasoline engines, NOx and particulate matter (PM) are contained in exhaust gas.

That is, since most diesel vehicles are combusted with sufficient air in most driving conditions, CO and HC have lower emission levels than gasoline vehicles, but the emission levels of NOx and PM are very high. PM is composed of solid carbon particles, soot, soluble organic fraction (SOF), and sulfate (Sulfate, H 2 SO 4 ).

The emission reduction technology of diesel vehicles is focused on the reduction of NOx and PM (hereinafter, 'smoke') including soot. A diesel particulate filter (DPF) is installed in the exhaust line to collect and remove soot.

The soot filtration device passes the exhaust gas discharged from the engine through a high temperature resistant filter to collect the soot on the porous wall surface of the filter to purify the exhaust gas. The soot filtration device can be repeatedly used without replacing the filter through the regeneration process of the filter. The regeneration process of the filter is performed by burning the soot by raising the inside of the soot filtration device to a temperature higher than the ignition temperature.

In order to increase the filtration efficiency of the soot filtration apparatus, eventually, the collected soot should be able to combust as soon as possible, which leads to a problem of increasing the regeneration efficiency of the filter.

Most of the filters used for soot filtration are made of silicon carbide (SiC), but recently, cordierite materials are inexpensive and light in weight.

Cordierite filters, however, are more susceptible to damage when exposed to higher temperatures than silicon carbide filters. That is, since cordierite material is somewhat weak in durability, the filter is overheated and damaged during an iterative regeneration process.

On the other hand, as exhaust gas regulations become more severe, many models are shifting their soot filters from underbody caltalytic converters (UCCs) located below the body floor to close-coupled caltalytic converters (CCCs). . However, as the installation position of the smoke filter is changed to CCC, the filter volume of the smoke filter is inevitably reduced due to the limitation of the layout of the vehicle.

Therefore, the filter having a smaller volume has to frequently burn soot accumulated in the filter in order to increase the purification efficiency, and thus there are problems such as fuel consumption loss due to frequent regeneration cycles and a decrease in the life of the filter.

Therefore, the present invention has been invented to solve such a problem, even if the material and the installed position of the filter changes, it is possible to efficiently remove the smoke accumulated in the smoke filtration device to increase the regeneration efficiency of the filter and ensure the life of the filter It is to provide a control method of a diesel particulate filter.

The present invention includes a smoke amount estimating step of determining whether to perform a regeneration process of a filter by estimating the amount of smoke accumulated in a smoke filter for purifying exhaust gas of an engine; And a regeneration logic determination step of determining a regeneration control logic of basic regeneration or multi-stage regeneration according to the estimated amount of smoke.

The regeneration control logic is a basic regeneration control logic in which the regeneration of the filter is performed by directly raising the temperature to a target temperature; And a multi-stage regeneration control logic in which the regeneration of the filter is performed by raising the target temperature step by step to increase the soot collection limit.

In the regeneration logic determination step, the amount of smoke estimated in the step of estimating the amount of smoke is compared with the reference smoke amount to be compared with the first level and the second level, and if the estimated amount of smoke is the first level, basic regeneration control logic. If the estimated soot amount is the second level, it may be to perform the multi-stage regeneration control logic.

The first level amount may be set as the soot collection limit of the filter when the basic regeneration control logic is performed, and the second level amount may be set as the soot collection limit of the filter when the multistage regeneration control logic is performed.

If the filter is a cordierite material, the first level amount may be 75% or less of the second level amount.

After performing the basic regeneration control logic and the multi-stage regeneration control logic, a regeneration completion step of determining whether combustion of the soot is completed may be performed.

In addition, the present invention comprises a smoke amount estimating step of determining whether to perform a regeneration process of the filter by estimating the amount of smoke accumulated in the smoke filter for purifying the exhaust gas of the engine; A reproduction logic determination step of selectively determining a reproduction control logic by determining whether the estimated soot amount is a first level or a second level; If the amount of smoke estimated in the smoke amount estimating step does not reach the first level, the collection is continued. If the result of the regeneration logic determination step is the first level, the basic regeneration control logic is performed and the second level is performed. It provides a control method of a diesel particulate filter characterized in that the multi-stage regeneration control logic.

After the basic regeneration control logic and the multi-stage regeneration control logic, a regeneration completion step of determining whether combustion of the soot is completed may be performed.

According to the control method of the diesel particulate filter according to the present invention, the regenerating step of the appropriate method can be performed whenever the amount of particulates is appropriately accumulated, so that the fumes accumulated in the particulate filter can be efficiently removed even if the material and the installed position of the filter change. This can increase the regeneration efficiency of the filter and ensure the life of the filter.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a flow chart of a control method of a diesel particulate filter of the present invention, Figure 2 is a diagram showing a regeneration method by the basic regeneration control logic, Figure 3 is a diagram showing a regeneration method by the multi-stage regeneration control logic. to be.

As shown in FIG. 1, the control method of the diesel particulate filter according to an embodiment of the present invention includes a smoke amount estimating step (S10) for estimating the amount of smoke accumulated in the particulate filter in a state in which the vehicle is normally operated. Do it first.

The soot amount estimating step (10) estimates the soot mass collected in the soot filtration apparatus by measuring a result value such as a differential pressure sensor, and performs a regeneration process of the filter using the estimated soot amount. Determine whether or not. That is, when the amount of smoke estimated through the smoke amount estimating step 10 reaches the preset reference smoke amount, the control is performed to perform regeneration, and when the amount of smoke is not reached, the control is continued to collect.

If it is determined that the smoke amount estimating step 10 is required to perform the regeneration process of the filter, a regeneration logic determination step (S20) is performed to determine which regeneration control logic to perform regeneration of the filter.

The regeneration logic determination step (S20) is whether to perform the regeneration of the filter in the basic regeneration control logic (S40) or multi-stage regeneration control logic (S30) according to the amount of smoke estimated in the fume amount estimation step (10). Judge.

For reference, the regeneration logic determination step (S20) may determine the criterion for regeneration time determination of the filter by examining various cases as follows.

1) When the amount of smoke collected in the filter reaches the preset standard smoke amount

2) When the driving distance reaches a certain km

3) When the operating time of the engine reaches a certain time

4) When fuel consumption reaches a certain amount

As described above, the playback time can be determined based on the four viewpoints. In this embodiment, the case of 1), which is the most general criterion, will be described.

That is, in the regeneration logic determination step (S20), the soot amount estimated in the soot amount estimation step (S10) and the reference smoke amount to be compared can be set in advance by dividing into two levels of first level and second level. have.

The amount of smoke as a reference of the first level means a limit for collecting soot suitable for starting the first reproduction, and the amount of smoke as a reference of the second level means the amount of smoke in an abnormal driving state such as when the vehicle is stopped. If it exceeds, it can be the soot collection limit of the filter.

That is, the first level may set the filter regeneration to the amount of smoke that is sufficient to use the basic regeneration control logic, and the second level may mean the amount of smoke that regenerates the filter to the multi-level regeneration control logic. .

Here, the reference amounts of the first level and the second level may be set differently according to the material and the size of the filter. That is, it may vary depending on the exhaust capacity (cc) depending on whether the filter is a SiC material or cordierite material. In the first level, the amount of smoke in the second level may be set in proportion to each other.

For example, if the filter is a cordierite material, the soot amount of the first level is preferably 75% or less when the soot amount of the second level is 100%. This proportional relationship can be obtained experimentally in consideration of the relationship between the regeneration efficiency of the cordierite filter and the durability (life) of the filter, and when the regeneration control logic described later is selectively performed, the durability of the filter is enhanced. Has a more important meaning.

If the reference amounts of the first level and the second level are set in advance, the reproduction logic determination step 20 determines whether to perform the basic reproduction control logic (S40) according to the result value estimated in the soot amount estimation step (S10). It has been described above that it is determined whether to perform S30).

The basic regeneration control logic (S40) refers to a method of performing a regeneration of the filter by immediately raising the temperature (1 region) to a target temperature as shown in FIG.

That is, the basic regeneration control logic (S40) is the smoke of the soot while the inlet temperature of the soot filtration device gradually increases the exhaust gas temperature through the fuel post-injection up to 620 to 650 ℃ (① zone), while maintaining the temperature at 650 ℃ Regeneration is performed until it is completely burned (2 area).

The multi-stage regeneration control logic (S30) may be a variety of ways to perform the regeneration of the filter by raising the temperature inside the soot filtration device to the target temperature step by step in order to increase the soot collection limit of the filter in a vehicle running in an abnormal driving state, and the like. Can be.

In the present embodiment, when the estimated soot amount corresponds to the second level amount, the multi-stage regeneration control logic (S30) is 550 to 580 ° C. which is the minimum temperature at which soot can be combusted by reacting with oxygen as shown in FIG. 3. After exhausting the fuel, the exhaust gas temperature is increased (1 zone), and a part of the smoke is combusted while maintaining the minimum temperature (2 zone), and the remaining soot is heated to 650 ° C and completely combusted (3 zone). .

As described above, when the regeneration logic determination step S20 determines that the smoke amount estimated in the smoke amount estimation step S10 is the second level amount, the multi-stage regeneration control logic S30 is performed, and the smoke level is determined to be the first level amount. Perform basic playback control logic.

Therefore, the regeneration cycle can be selectively performed in consideration of the soot collection limit that can be collected according to the material and size of the filter, thereby improving the durability of the filter and extending its life.

As described above, when the basic logic control logic (S40) and the multi-stage regeneration control logic (S30) are selectively performed in the regeneration logic determination step (S20), respectively, determining whether the collected soot is completely burned and completing the regeneration. Perform (S50). That is, if the collected soot is not completely burned, the regeneration is continued, and if the soot is completely burned, the regeneration is completed.

As such, the amount of smoke collected in the smoke filter is estimated, and regeneration can be performed at two levels and stages according to the material and size of the filter of the smoke filter. Therefore, the durability of the filter is improved and the recycling efficiency is improved. In addition to improving fuel efficiency, the fuel after injection can be reduced.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a flow chart for the control method of the diesel particulate filter of the present invention.

2 is a diagram showing a reproducing method by the basic reproducing control logic;

3 is a diagram showing a reproducing method using multi-stage regeneration control logic;

<Description of reference numerals for main parts of the drawings>

S10: Soot estimating step S20: Regeneration logic determination step

S30: Multi-stage play control logic S40: Basic play control logic

S50: Play Complete Step

Claims (8)

  1. A smoke amount estimating step of determining whether to perform a regeneration process of the filter by estimating the amount of smoke accumulated in the smoke filter for purifying exhaust gas of the engine; And
    Regeneration logic determination step of determining the regeneration control logic of the basic regeneration or multi-stage regeneration according to the estimated amount of soot.
  2. The method of claim 1,
    The regeneration control logic,
    A basic regeneration control logic in which the regeneration of the filter is performed by directly raising the temperature to a target temperature; And
    And a multi-stage regeneration control logic in which the regeneration of the filter is performed by raising the temperature to the target temperature step by step to increase the particulate collection limit.
  3. The method of claim 2,
    The regeneration logic determination step
    The smoke amount estimated in the smoke amount estimating step and the reference smoke amount to be compared are first divided into a first level and a second level, and if the estimated smoke amount is a first level, basic regeneration control logic is estimated. And controlling the multi-stage regeneration control logic if the amount is the second level.
  4. The method of claim 3,
    The first level amount is set to the soot collection limit of the filter when performing the basic regeneration control logic, and the second level amount is set to the soot collection limit of the filter when performing the multi-stage regeneration control logic. Control method.
  5. The method according to any one of claims 1 to 4,
    And the first level amount is 75% or less of the second level amount if the filter is cordierite material.
  6. The method according to any one of claims 2 to 4,
    And after the basic regeneration control logic and the multi-stage regeneration control logic are performed, a regeneration completion step of determining whether or not the combustion of the soot is completed is performed.
  7. A smoke amount estimating step of determining whether to perform a regeneration process of the filter by estimating the amount of smoke accumulated in the smoke filter for purifying exhaust gas of the engine;
    A reproduction logic determination step of selectively determining a reproduction control logic by determining whether the estimated soot amount is a first level or a second level; Including;
    If the amount of smoke estimated in the smoke amount estimating step does not reach the first level, collection is continued.
    And if the result value of the regenerative logic determination step is a first level, a basic regenerative control logic is performed, and a second level regenerative control logic is performed.
  8. The method of claim 7, wherein
    After the basic regeneration control logic and the multi-stage regeneration control logic control method of the diesel particulate filter characterized in that the regeneration completion step of determining whether the combustion of the smoke is completed.
KR1020090070022A 2009-07-30 2009-07-30 Method for emission controlling of diesel particulate filter KR20110012338A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT107398A (en) * 2014-01-12 2015-07-13 Octávio Adolfo Romão Viana Ethylene and polypheneetalate filter and / or graffen oxide
US9636855B2 (en) 2011-05-03 2017-05-02 The Board Of Regents For Oklahoma State University Polyethylene terephthalate-graphene nanocomposites

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9636855B2 (en) 2011-05-03 2017-05-02 The Board Of Regents For Oklahoma State University Polyethylene terephthalate-graphene nanocomposites
PT107398A (en) * 2014-01-12 2015-07-13 Octávio Adolfo Romão Viana Ethylene and polypheneetalate filter and / or graffen oxide

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