US20160032799A1 - Method and system of maintaining dpf regeneration for improving durability of dpf filter - Google Patents

Method and system of maintaining dpf regeneration for improving durability of dpf filter Download PDF

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Publication number
US20160032799A1
US20160032799A1 US14/626,345 US201514626345A US2016032799A1 US 20160032799 A1 US20160032799 A1 US 20160032799A1 US 201514626345 A US201514626345 A US 201514626345A US 2016032799 A1 US2016032799 A1 US 2016032799A1
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United States
Prior art keywords
dpf
reference value
soot
equal
idle state
Prior art date
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Abandoned
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US14/626,345
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English (en)
Inventor
Won Jin JO
Chung Gyu KIM
Seok Dong KIM
Je Rok CHUN
Jae Yeon Lee
Byeong Kyu YOON
Bong Kyoo PARK
Young Jic Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Motor Co
Kia Corp
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Hyundai Motor Co
Kia Motors Corp
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=54873005&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20160032799(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hyundai Motor Co, Kia Motors Corp filed Critical Hyundai Motor Co
Assigned to HYUNDAI MOTOR COMPANY, KIA MOTORS CORP. reassignment HYUNDAI MOTOR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JO, WON JIN, CHUN, JE ROK, KIM, CHUNG GYU, KIM, SEOK DONG, KIM, YOUNG JIC, LEE, JAE YEON, PARK, BONG KYOO, YOON, BYEONG KYU
Publication of US20160032799A1 publication Critical patent/US20160032799A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust 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
    • F01N3/023—Exhaust 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus

Definitions

  • the present invention relates to a method and a system of maintaining diesel particulate filter (DPF) regeneration for improving durability of a DPF filter, and more particularly, to a method and a system of maintaining DPF regeneration for improving durability of a DPF filter by maintaining the DPF regeneration until a soot mass in the DPF is equal to or less than a set target reference value even when a vehicle enters an idle state while the vehicle is driven.
  • DPF diesel particulate filter
  • Exhaust gas emitted from an engine is induced into and purified by a catalytic converter which is disposed in the middle of an exhaust pipe and emitted into the air through a tail exhaust pipe after noise is reduced while passing through a muffler.
  • the exhaust gas emitted from the engine needs to meet OBD regulations which define a regulation of exhaust gas and several regulations associated with standardization in a diagnosis and after service (A/S) market detecting a failure and a deterioration of exhaust related parts.
  • OBD regulations which define a regulation of exhaust gas and several regulations associated with standardization in a diagnosis and after service (A/S) market detecting a failure and a deterioration of exhaust related parts.
  • a diesel vehicle has used an oxidation catalyst, a diesel particulate filter (DPF), a selective catalytic reduction (SCR) catalyst, and the like and a combination and a disposition position of the catalysts are differently determined depending on a design of the vehicle.
  • DPF diesel particulate filter
  • SCR selective catalytic reduction
  • a diesel particulate filter physically captures particulate materials such as soot included in exhaust gas and when the diesel particulate filter captures the particulate materials after a vehicle drives a predetermined distance or at a difference pressure between both ends thereof which is equal to or more than a set reference pressure, the captured materials are combusted and regenerated due to exhaust gas which rises to a high temperature of approximately 500 to 650° C. depending on a post-injection control.
  • the DPF filter may be mainly made of materials such as SiC and cordierite which may be damaged.
  • the endurance limit temperature of the filter is approximately 1100° C. and the limit temperature gradient is approximately 400° C./cm.
  • the oxygen concentration is increased and the flux of exhaust gas is reduced to cause the abnormal DPF regeneration, such that the DPF may be damaged.
  • FIG. 1 is a graph illustrating an operation temperature of the filter and a gradient temperature of the filter when the vehicle enters the idle state during the DPF regeneration process.
  • the DPF regeneration process is made while the engine is driven at approximately 2000 rpm and the oxygen concentration of a front end of the DPF is controlled to be 15% or less in section “A” in which a general driving state is represented and the vehicle is driven at approximately 700 to 800 rpm and the oxygen concentration of the front end of the DPF is controlled to be 8% or less when the vehicle enters the so-called idle state during drop to idle (section “B”) and then the oxygen concentration of the front end of the DPF is not controlled in a section “C”.
  • the present invention relates to a method and a system of maintaining DPF regeneration for improving durability of a DPF filter for solving the existing problems.
  • a related art entitled “Apparatus And Method For Protection Diesel Particulate Filter” is implemented by determining whether abnormal DPF regeneration occurs when a vehicle enters an idle state during the generation of the diesel particulate filter to prevent the diesel particulate filter from rising to a limit temperature or more but has a limitation that it does not disclose the technical spirit of the present invention which maintains the DPF regeneration for a predetermined time even when the vehicle enters the idle state until a soot mass in the DPF is a predetermined reference value or less.
  • Various aspects of the present invention are directed to providing a method and a system of maintaining DPF regeneration for improving durability of a DPF filter capable of preventing a damage of the DPF by maintaining the DPF regeneration process until a soot mass in the DPF is equal to or less than a set target reference value even when a vehicle enters an idle state during the DPF regeneration process so as to prevent the damage of the DPF which occurs when the vehicle enters the idle state during the DPF regeneration process.
  • a method of maintaining diesel particulate filter (DPF) regeneration for improving durability of a DPF may include determining, by a controller, whether a vehicle enters an idle state during the DPF regeneration, controlling, by the controller, a concentration of oxygen introduced into the DPF to be equal to or less than a first reference value when the vehicle enters the idle state, and performing, by the controller, a regeneration process until a soot mass in the DPF is equal to or less than a target reference value.
  • DPF diesel particulate filter
  • the method may further include, after the determining whether the vehicle enters the idle state during the DPF generation, comparing, by the controller, the soot mass in the DPF with a preset soot reference value when the vehicle enters the idle state.
  • the method may further include, in the comparing of the soot mass in the DPF with the preset soot reference value when the vehicle enters the idle state, when the soot mass in the DPF is equal to or more than the preset soot reference value, controlling, by the controller, the concentration of the oxygen introduced into the DPF to be equal to or less than the first reference value, and when the soot mass in the DPF is less than the preset soot reference value, controlling, by the controller, the concentration of the oxygen introduced into the DPF to be equal to or less than a second reference value larger than the first reference value.
  • the concentration of the oxygen introduced into the DPF is controlled by using a shutoff valve installed in front of an engine.
  • a system of maintaining DPF regeneration for improving durability of a diesel particulate filter may include the DPF capturing a soot captured in exhaust gas, and a controller receiving a signal about whether a vehicle is currently in an idle state to maintain the DPF regeneration in the idle state of the vehicle until a soot mass in the DPF reaches a target reference value to prevent the DPF from arriving at a limit temperature and a limit temperature gradient.
  • the controller receives the signal about whether the vehicle is currently in the idle state and controls a concentration of oxygen introduced into the DPF to be equal to or less than a first reference value to maintain the DPF regeneration until the soot mass in the DPF reaches the target reference value.
  • the controller receives the signal about whether the vehicle is currently in the idle state and then determines whether the soot mass in the DPF is equal to or more than a preset soot reference value.
  • the controller controls the concentration of the oxygen introduced into the DPF to be equal to or less than the first reference value when the soot mass in the DPF is equal to or more than the preset soot reference value, and when the soot mass in the DPF is less than the preset soot reference value, controlling, by the controller, the concentration of the oxygen introduced into the DPF to be equal to or less than a second reference value larger than the first reference value to maintain the DPF regeneration until the soot mass in the DPF reaches the target reference value.
  • the controller transfers a signal to a shutoff valve installed in front of an engine to control a concentration of oxygen introduced into the DPF.
  • vehicle or “vehicular” or other similar terms as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g., fuel derived from resources other than petroleum).
  • a hybrid vehicle is a vehicle that has two or more sources of power, for example, both gasoline-powered and electric-powered vehicles.
  • FIG. 1 is a graph illustrating a variation of an operation temperature and a gradient temperature of a DPF which occurs while exiting a DPF regeneration process when a vehicle enters an idle state while the vehicle is driven, according to the related art.
  • FIG. 2 and FIG. 3 are flow charts of a method of maintaining DPF regeneration for improving durability of a DPF filter according to an exemplary embodiment of the present invention.
  • FIG. 4 is a flow chart illustrating a detailed control for each process of the method of maintaining DPF regeneration for improving durability of a DPF filter according to an exemplary embodiment of the present invention.
  • FIG. 5 is a graph confirming that durability of DPF is improved by a control logic according to an exemplary embodiment of the present invention.
  • FIG. 6 is a graph illustrating a concentration of oxygen introduced into the DPF and a soot mass remaining within the DPF depending on a control process according to an exemplary embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a system of maintaining DPF regeneration for improving durability of a DPF filter according to an exemplary embodiment of the present invention.
  • FIG. 2 is an overall flow chart of a method of maintaining DPF regeneration for improving durability of a DPF filter according to various embodiments of the present invention.
  • the method of maintaining DPF regeneration for improving durability of a DPF filter according to various embodiments of the present invention largely includes determining whether a vehicle enters an idle state (S 100 ), controlling a concentration of oxygen introduced into the DPF to be equal to or less than a set first reference value (S 200 ), and performing a DPF regeneration process until a soot mass in the DPF is equal to or less than a set target reference value (S 300 ).
  • the determining whether the vehicle enters the idle state during the regeneration process of the DPF filter is performed (S 100 ) and it may be detected whether the vehicle enters the idle state based on various information such as an acceleration pedal signal and a gear ratio.
  • the controlling of the concentration of oxygen introduced into the DPF to be equal to or less than the set first reference value is performed (S 200 ).
  • the oxygen concentration is controlled to be equal to or less than the set first reference value to prevent the DPF filter from being exposed to a high temperature for improving the durability of the DPF, in which the oxygen concentration which is the first reference value may be controlled to 8% or so.
  • the regeneration process is performed until an amount of soot in the DPF is equal to or less than the set target reference value while the concentration of oxygen introduced into the DPF is controlled to be equal to or less than the first reference value as described above.
  • the DPF regeneration process exits after the predetermined time lapses when the vehicle enters the idle state during the DPF regeneration process.
  • the regeneration process is suspended while a large amount of soot still remains in the DPF, and then, the oxygen concentration is increased, such that the temperature of the DPF filter may rise while the soot burning in the DPF is excessively burned due to the excessively supplied oxygen.
  • various embodiments of the present invention have a characteristic in that the DPF regeneration process is maintained until the soot mass in the DPF falls to the set target reference value or less even though the vehicle enters the idle state during the DPF regeneration process.
  • the target reference value may be set to be 2% but a volume of the DPF is diverse. Generally, if it is assumed that the target reference value is 100% when the soot mass of 8 g per a volume 1 L of the DPF is present, the regeneration process is performed until the target reference value reaches 2% based on the amount.
  • the method for measuring a soot mass in a DPF measures a soot mass based on a pressure difference using pressure sensors installed at front and rear ends of the DPF.
  • the regeneration process is performed until the soot mass in the DPF is equal to or less than the set target reference value to prevent the DPF from arriving at a maximum limit temperature and a limit temperature gradient of the DPF filter, such that it is possible to previously prevent the DPF from being damaged.
  • the method of maintaining DPF regeneration for improving durability of a DPF filter further includes comparing the soot mass in the DPF with a preset soot reference value when the vehicle enters the idle state (S 110 ) after determining whether the vehicle enters the idle state during the regeneration of the DPF (S 100 ).
  • the soot mass in the DPF is equal to or more than 30% which is the soot reference value
  • the soot mass in the DPF is much and thus a lot of the soot are excessively burned to excessively rise the temperature of the DPF when the concentration of oxygen introduced into the DPF is excessively higher and thus the concentration of oxygen introduced into the DPF is controlled to be equal to or less than the set first reference value.
  • the method of maintaining DPF regeneration for improving durability of a DPF filter further includes controlling the concentration of oxygen introduced into the DPF to be equal to or less than a first reference value, and when the soot mass in the DPF is less than the preset soot reference value, controlling, by the controller, the concentration of the oxygen introduced into the DPF to be equal to or less than a second reference value larger than the first reference value in which the second reference value may be set to be 15%.
  • the soot mass in the DPF is less than 30%
  • the soot mass in the DPF to be burned oxygen introduced into the DPF is relatively smaller, even when the concentration of oxygen introduced into the DPF is controlled to be 15%, not to be 8%.
  • the regeneration of the DPF can be swiftly completed while damage of the DPF is prevented because temperature rise of the DPF is relatively smaller compared with that in case which the soot mass in the DPF is more than 30%.
  • FIG. 4 is a flow chart illustrating a detailed control for each process of the method of maintaining DPF regeneration for improving durability of a DPF filter according to various embodiments of the present invention.
  • the regeneration process is performed until the soot mass in the DPF is equal to or less than the set target reference value and then the regeneration process ends and after it is confirmed whether the engine of the vehicle starts, if it is determined that the engine does not start, the control logic ends and if it is determined that the engine starts, it is again determined whether the soot mass in the DPF is 100% and then the control logic as described above is again performed.
  • FIG. 5 is a graph illustrating an experiment result that the durability of the DPF is improved by maintaining the regeneration process by the foregoing control process until the soot mass in the DPF is equal to or less than the target reference value even when the vehicle enters the idle state during the regeneration process.
  • the regeneration process is performed until the soot mass in the DPF is equal to or less than the target reference value when the vehicle enters the idle state during the regeneration process and thus an operation temperature X of the DPF and a gradient temperature Y in the filter are formed to be smaller than a limit value as compared with the related art, thereby confirming that the durability of the DPF is improved.
  • region “A” is a region in which the concentration of oxygen introduced into the DPF is controlled to be equal to or less than 15%
  • region “B” is a region in which the concentration of oxygen intruded into the DPF is controlled to be equal to or less than 8%
  • region “C” is a region in which the concentration of oxygen again introduced into the DPF is controlled to be equal to or less than 15%
  • region “D” is a region in which the concentration of oxygen introduced into the DPF is no more controlled.
  • FIG. 6 is a graph illustrating a change in a variation of the soot mass in the DPF by controlling an engine speed and the concentration of oxygen introduced into the DPF according to various embodiments of the present invention.
  • the concentration of oxygen introduced into the DPF is controlled when the vehicle enters the idle state while the regeneration process is performed while the vehicle is driven and the regeneration process is performed until the soot mass in the DPF is equal to or less than the set target reference value, thereby improving the durability of the DPF.
  • the concentration of oxygen introduced into the DPF is controlled by using a shutoff valve installed in front of the engine.
  • FIG. 7 is an overall configuration diagram of a system of maintaining DPF regeneration for improving durability of a DPF filter according to various embodiments of the present invention.
  • the system includes the DPF capturing the soot captured in exhaust gas and a controller 100 which receives a signal about whether the vehicle is currently in the idle state to maintain the regeneration in the idle state of the vehicle until the soot mass in the DPF reaches the set target reference value so as to prevent the DPF from arriving at the limit temperature and the limit temperature gradient.
  • the controller 100 receives the signal about whether the vehicle is currently in the idle state and controls the concentration of oxygen introduced into the DPF to be equal to or less than the first reference value to maintain the regeneration until the soot mass in the DPF reaches the set target reference value.
  • the controller 100 further includes receiving the signal about whether the vehicle is currently in the idle state and then controlling the concentration of the oxygen introduced into the DPF to be equal to or less than the first reference value when the soot mass in the DPF is equal to or more than the preset soot reference value, and when the soot mass in the DPF is less than the preset soot reference value, controlling, by the controller, the concentration of the oxygen introduced into the DPF to be equal to or less than a second reference value larger than the first reference value until the soot mass in the DPF reaches the set target reference value.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
US14/626,345 2014-08-04 2015-02-19 Method and system of maintaining dpf regeneration for improving durability of dpf filter Abandoned US20160032799A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2014-0099728 2014-08-04
KR1020140099728A KR101575513B1 (ko) 2014-08-04 2014-08-04 Dpf 필터의 내구성 향상을 위한 재생 유지방법 및 그 제어 시스템.

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US (1) US20160032799A1 (zh)
KR (1) KR101575513B1 (zh)
CN (1) CN105317509B (zh)
DE (1) DE102015103917B4 (zh)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP3546716A1 (fr) * 2018-03-28 2019-10-02 RENAULT s.a.s. Procédé et système de commande de la régénération d 'un filtre à particules

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CN107387204B (zh) * 2017-08-11 2019-05-03 广西玉柴机器股份有限公司 一种dpf主动再生优化方法及其控制系统
CN111828147B (zh) * 2020-06-16 2022-06-14 义乌吉利动力总成有限公司 一种车辆排气的再生方法及系统

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US20090282816A1 (en) * 2008-05-19 2009-11-19 Gm Global Technology Operations, Inc. Fresh Air Bypass to Cool Down Hot Exhaust in DPF Regeneration Mode at Low Vehicle Speed and Idle
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JP4655003B2 (ja) 2006-08-09 2011-03-23 株式会社デンソー 排気浄化装置の過昇温防止装置
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Publication number Priority date Publication date Assignee Title
US20080173010A1 (en) * 2006-12-20 2008-07-24 Suresh Arvind S System and method for inhibiting uncontrolled regeneration of a particulate filter for an internal combustion engine
US20090282816A1 (en) * 2008-05-19 2009-11-19 Gm Global Technology Operations, Inc. Fresh Air Bypass to Cool Down Hot Exhaust in DPF Regeneration Mode at Low Vehicle Speed and Idle
US20110107741A1 (en) * 2009-11-10 2011-05-12 Gm Global Technology Operations, Inc. Exhaust gas oxygen concentration control system and method
US20110209463A1 (en) * 2010-02-26 2011-09-01 Gm Global Technology Operations, Inc. Method and system for controlling an engine during diesel particulate filter regeneration at idle conditions
US20130152551A1 (en) * 2010-09-09 2013-06-20 Dow Global Technologies Llc Method and apparatus for decreasing fuel comsumption during particulate filter generation
US20130047582A1 (en) * 2011-08-29 2013-02-28 GM Global Technology Operations LLC Control apparatus for temperature excursions within an exhaust gas treatment system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3546716A1 (fr) * 2018-03-28 2019-10-02 RENAULT s.a.s. Procédé et système de commande de la régénération d 'un filtre à particules
FR3079556A1 (fr) * 2018-03-28 2019-10-04 Renault S.A.S Procede et systeme de commande de la regeneration d'un filtre a particules

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CN105317509B (zh) 2019-06-21
CN105317509A (zh) 2016-02-10
DE102015103917A1 (de) 2016-02-04
DE102015103917B4 (de) 2022-07-28
KR101575513B1 (ko) 2015-12-08

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