EP2627887A1 - Recyclage des gaz d'échappement à évacuation du condensat - Google Patents

Recyclage des gaz d'échappement à évacuation du condensat

Info

Publication number
EP2627887A1
EP2627887A1 EP11761509.6A EP11761509A EP2627887A1 EP 2627887 A1 EP2627887 A1 EP 2627887A1 EP 11761509 A EP11761509 A EP 11761509A EP 2627887 A1 EP2627887 A1 EP 2627887A1
Authority
EP
European Patent Office
Prior art keywords
condensate
egr
path
exhaust gas
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP11761509.6A
Other languages
German (de)
English (en)
Inventor
Thomas Koch
Johannes Ritzinger
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.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimler AG filed Critical Daimler AG
Publication of EP2627887A1 publication Critical patent/EP2627887A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/24—Layout, e.g. schematics with two or more coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters

Definitions

  • the present invention relates to a method for removing condensate from an EGR path (EGR exhaust gas recirculation) of an internal combustion engine. Furthermore, the invention relates to an EGR device and an exhaust system with such an EGR device.
  • EGR path EGR exhaust gas recirculation
  • EGR exhaust gas recirculation
  • a certain proportion of the exhaust gas is returned to the internal combustion engine via an EGR path.
  • condensate can precipitate out of the exhaust gas or out of an exhaust gas / fresh air mixture in the EGR path.
  • the condensate can lead to sooting and corrosion of the components in the EGR path. It thus makes sense to remove the condensate as quickly and completely as possible from the EGR path or to suppress the formation of condensate.
  • the formation in the case of a low-pressure EGR is avoided in that the charge air cooler is designed as a downflow cooler, so that any condensate that may form can collect at the lowest point of the vertical intercooler and can subsequently be discharged.
  • the charge air cooler is designed as a downflow cooler, so that any condensate that may form can collect at the lowest point of the vertical intercooler and can subsequently be discharged.
  • at least one EGR cooler preferably the last EGR cooler in the exhaust gas flow direction, is designed as such a downflow cooler, so that any condensate formed can collect at the lowest point of the EGR cooler designed as a downflow cooler.
  • EP 2 161 430 A1 a charge air cooler with condensate drain is described.
  • the EGR device is designed as a low-pressure EGR. Any condensate that may accumulate at the lowest point of the intercooler can be collected in the intercooler.
  • the intercooler is equipped with a condensate drain opening, which is fluidly connected to the fresh air path via a condensate drain line.
  • the condensing Sat inlet point arranged in the charge air flow direction after the intercooler.
  • the condensate discharge opening can be closed by means of a closure element.
  • any accumulating condensate can be retained by the charge air cooler when an introduction of the condensate in the fresh air path is unfavorable due to the respective operating state. If an introduction of condensate is unproblematic, the closure element can be opened and the condensate introduced into the fresh air path.
  • the exhaust system of the internal combustion engine of WO 2009/048408 A1 is equipped with a
  • High pressure EGR equipped In this case, one or two first EGR coolers and a second EGR cooler are arranged in the EGR path.
  • the exhaust gas may be circulated in the EGR path area of the first radiator (s). Due to the longer contact time of the exhaust gas with the / the first EGR cooler / n condensate can be increasingly separated from the circulating exhaust gas.
  • the first or the first EGR cooler can be at least partially cleaned of soiling.
  • WO 2009 / 072963A1 an internal combustion engine is described with a high-pressure EGR.
  • EGR path of the EGR device two ARG coolers are arranged.
  • condensate occurring in the second EGR cooler can be introduced via an EGR discharge line in the EGR path in front of the first EGR cooler.
  • the EGR cooler is formed air-cooled and has a condensate collecting region, which is connected via the Kondensatabschreib with the EGR path before the first EGR cooler or with the first EGR cooler fludisch conductive.
  • a pump is arranged in the condensate discharge line, with which the condensate can be transported in the event of a back pressure in the EGR path.
  • a promotion of the condensate by means of a pump in the EGR path is structurally complex and are also other components present, they can be damaged due to the aggressive, corrosive atmosphere of the recirculated exhaust gas and impaired in their function.
  • the present invention addresses the problem of providing an improved or at least one alternative embodiment for a method of removing condensate from its internal combustion engine EGR path, for an EGR device, and an exhaust system having such an EGR device in particular by a simplified, less vulnerable transport of the
  • the invention is based on the general idea, in a method for
  • An EGR path is to be understood as that line region, including the components arranged therein and through which the exhaust gas recirculated flows, by means of which the recirculated exhaust gas is supplied to the fresh air path and the part of the fresh air path through which the recirculated exhaust gas flows.
  • the EGR path is disposed between a branch point of the exhaust gas from the exhaust path and the engine.
  • the exhaust path is consequently the line region through which exhaust gas flows.
  • the fresh air path is the line area over which the
  • Internal combustion engine is supplied fresh air, wherein at least a portion of the
  • Line area can also be attributed to the EGR path.
  • a high-pressure EGR is understood to mean an EGR device in which the point of introduction is arranged downstream of a compressor of a charging device.
  • the recirculated exhaust gas is introduced into a high-pressure region.
  • a low-pressure EGR Consequently, one stands for an EGR device in which the introduction point for the recirculated exhaust gas is arranged in front of a compressor of a charging device.
  • the recirculated exhaust gas is introduced into a low pressure region. It is the combination of low pressure EGR and high pressure EGR possible in an EGR device, as well as the single application of high pressure or low pressure EGR is conceivable.
  • the separated in a respective heat exchanger condensate consists of mainly water and sulfur oxides, which react in conjunction with the water to sulfurous acid or sulfuric acid or a mixture thereof. Furthermore, nitrogen oxides or nitrogen oxide acids can occur in the condensate, as can combustion residues.
  • the problem with the condensate, especially in the case of sulfur-containing fuel, is the occurrence of sulfuric acid or sulfurous acid or a mixture of the two acids.
  • a concentration of the sulfuric acid or of the sulfurous acid occurs when it is attempted to evaporate the condensate.
  • the condensate can be evaporated again only at very high temperatures. Accordingly, either complete prevention of condensate formation or complete removal of the condensate is advantageous, with complete removal of the condensate formed reducing the recirculated exhaust gas to less aggressive and corrosive and improving exhaust emission levels.
  • the discharge of the condensate from the condensate collecting region can be controlled / regulated in accordance with a preferred embodiment of the invention by means of a closure element. It can always be when in the
  • Condensate collecting a higher pressure prevails than in the Kondensatabriol Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoff Kunststoffneck, a closure element are opened, so that due to the pressure difference, the condensate is discharged from the condensate collection area.
  • the closure element is preferably opened when the pressure in the condensate collecting region is greater than 20%, particularly preferably greater than 40% or greater than 60%, than the pressure in the condensate discharge region.
  • the closure element is preferably opened for a short time.
  • the opening is carried out so fast that the short-term pressure drop in the EGR path has only a negligible effect with respect to a boost pressure and / or with respect to a lambda control.
  • the closure element can be designed as an electronically controllable valve, as a pressure-controlled valve or the like.
  • the opening of the closure element can be carried out at least in a partial load range such that it simultaneously accumulates the accumulated
  • Engine throttling in a partial load range provide dynamic advantages, since the charging device starts at a higher speed level.
  • the EGR device in particular an internal combustion engine with a charging device having a turbine and a compressor.
  • the EGR device has at least one condensate discharge device for removing condensate from an EGR path of the AGL device, wherein the condensate discharge device has a condensate collection region arranged in the EGR path and a closure element arranged before or after a discharge opening.
  • the EGR device is designed such that due to a pressure difference between the
  • Closing element accumulated condensate is discharged from the condensate collection area in the Kondensatabloom Kunststoff Edition.
  • Closure element are removed from the EGR path.
  • Kondensatab Wenninger Wenninger arranged components in the EGR path are exposed to a lower corrosive load, resulting in a longer for these components
  • control regulation device may be provided which controls the opening and closing of the closure element controls. It can the Control device may be formed integrally with the engine controller or constitute a separate unit, optionally with the engine control
  • At least one condensate discharge area may be the EGR path before the compressor, an exhaust path after the turbine, the exhaust path after one
  • the condensate can be re-introduced into the fresh air path.
  • the condensate can be introduced after the turbine of the charger or after the exhaust gas catalyst in the exhaust path.
  • the Kondensatab2020 Colour may be fluidly connected.
  • the Kondensatab2020vorides may be arranged in the exhaust gas flow direction in front of a throttle element for limiting the air supply to the internal combustion engine. Furthermore, the
  • Kondensatab Wenninger be arranged in the exhaust gas flow direction after a compressor of the charging device.
  • the arrangement of the Kondensatab Wennvorides in the exhaust gas flow direction after a heat exchanger is advantageous. It may be formed integrally with the heat exchanger, the Kondensatab centuryvorides.
  • the heat exchanger may be an EGR cooler and / or a charge air cooler.
  • the Kondensatab Wennvorides is arranged after the charge air cooler and in front of the throttle element. In this case, simply by controlling the throttle element in the area of the condensate discharge device, a high pressure can be generated, so that by controlling the
  • Throttle element a pressure difference between the condensate collection area and the Kondensatab réelle Scheme is generated.
  • Kondensatab Wenninger Kunststoffvoriques with its closure element are also advantageous given the possibilities of Brennkraftmaschinenent throttling in a partial load range.
  • An exhaust system equipped with such an EGR device is characterized by a significantly lower load on the components in the EGR path.
  • FIG. 1 shows an internal combustion engine with an exhaust system according to the invention, which has a low-pressure EGR, and with an introduction of the condensate in the exhaust path,
  • 3 shows the internal combustion engine with the exhaust system, which has a low-pressure EGR and with a discharge of the condensate into the environment
  • 4 shows a heat exchanger with downstream in the exhaust gas flow direction condensate discharge device.
  • An internal combustion engine 1 shown in FIG. 1 is equipped with an exhaust path 2 and a fresh air path 3 and a charging device 4.
  • a turbine 5 of the charging device 4 is driven.
  • a compressor 6 of the charging device 4 the fluids flowing in the fresh air path 3 are compressed.
  • the fresh air path 3 is divided into a low-pressure region 7 and a high-pressure region 8.
  • the low-pressure region 7 is arranged in front of the compressor 6 and the high-pressure region 8 downstream of the compressor 6.
  • a throttle element 1 1 with the fresh air supply to the engine 1 can be limited arranged. Accordingly, there is a pressure ⁇ ⁇ in the fresh air path 3 in the low-pressure region 7 and a pressure in the high-pressure region 8 in front of the throttle element 11 and a pressure p 2 s downstream of the throttle element 11. In operation of the internal combustion engine 1, the pressure is thus in most cases p 2 greater than the pressure p 2 s and also greater than the pressure p
  • a catalyst 12 may be arranged in the exhaust path 2.
  • a low-pressure EGR 13 shown in FIG. 1 in the exhaust gas flow direction 14 after the catalyst 12 at a branch point 15 partial exhaust gas can be taken off and introduced into the fresh air path 3 via an EGR path 16 at an introduction point 17.
  • the point of introduction 17 in the direction of fresh air flow 9 lies in front of the compressor 6, so that the recirculated exhaust gas is introduced into the low-pressure region 7 of the fresh air path 3.
  • an EGR valve 18 can be arranged at the branching point 15, with which the amount of recirculated exhaust gas can be controlled.
  • at least one heat exchanger 19, which is designed as an EGR cooler may be arranged, with which the recirculated exhaust gas can be cooled.
  • a Kondensatab fertilvorraum 20 After the formed as charge air cooler heat exchanger 10 can be arranged in the fresh air path 3 a Kondensatab Wennvortechnisch 20.
  • the Kondensatab Wennvortechnisch 20 is equipped with a closure element 21 and has a Kondensatabrios effet für 22.
  • the closure element 21 can be used as a throttle element, as a valve or the like. be trained.
  • the discharge of the condensate from a condensate collecting region 23 in a Kondensatabfueled Scheme 24 can be controlled / regulated.
  • the condensate collecting region 23 is connected to the condensate discharge region 24 in a fluid-conducting manner via the condensate discharge line 22.
  • the condensate discharge region 24 is arranged in the exhaust gas path 2 in the exhaust gas flow direction 14 downstream of the catalytic converter 12 and downstream of the EGR valve 18 or downstream of the branching point 15.
  • the condensate is introduced into the exhaust path 2 so that it can no longer get back into the EGR path 16 and thus no concentration of the condensate takes place in the EGR path 16.
  • the condensate formed is introduced via the Kondensatab2020 Gustav 22 in a Kondensatab réelle Scheme 24 '.
  • the condensate discharge region 24 ' lies in the fresh air flow direction 9 in front of the compressor 6.
  • the condensate can also be released to the environment.
  • the condensate discharge area 24 is the environment, in which case the condensate must be discharged against the atmospheric pressure or against the normal pressure p 0 , consequently, the pressure p 2 must be greater than the ambient pressure P 0 so that the pressure Condensate in the Kondensatab réelle Scheme 24 "can be discharged.
  • the condensate should be diluted or neutralized due to its aggressiveness and corrosiveness.
  • a Kondensatab Wennvortechnisch 20 shown in Fig. 4 is arranged in the fresh air flow direction 9 after the heat exchanger 10.
  • the heat exchanger 10 is preferably inclined so that any condensate formed in the heat exchanger 10 can run off in a simplified manner to the condensate discharge device 20.
  • the Kondensatab Wennvortechnisch 20 is preferably located at the lowest point with respect to the fresh air path 3 and the heat exchanger 10.
  • the condensate discharge device 20 may have a condensate collecting region 23 ', which is designed in the manner of a collecting container, a pipe cavity, a pipe casing or the like.
  • an EGR device 25 may comprise as essential components the EGR path 16, at least one heat exchanger 19 designed as an EGR cooler, and at least one closure element 21.
  • the closure element 21 as
  • the EGR device 25 has the condensate discharge device 20.
  • Condensate removal device 25 may in turn have the condensate collection area 23 and the condensate discharge line 22.

Abstract

L'invention porte sur un procédé pour évacuer le condensat d'un trajet AGR (AGR = recyclage des gaz d'échappement) (16) d'un moteur à combustion interne (1), en particulier d'un moteur d'un véhicule automobile, dans lequel, sous l'effet d'une la différence de pression entre une région collectrice de condensat (23) disposée dans le trajet AGR (16), et une région d'évacuation du condensat (24, 24', 24''), le condensat accumulé est évacué au moins en partie de la région collectrice de condensat (23) vers la région d'évacuation du condensat (24, 24', 24'') lorsqu'il règne une plus haute pression dans la région collectrice de condensat (23) que dans la région d'évacuation du condensat (24, 24', 24'').
EP11761509.6A 2010-10-14 2011-09-20 Recyclage des gaz d'échappement à évacuation du condensat Ceased EP2627887A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010048465A DE102010048465A1 (de) 2010-10-14 2010-10-14 Abgasrückführung mit Kondensatabführung
PCT/EP2011/004692 WO2012048786A1 (fr) 2010-10-14 2011-09-20 Recyclage des gaz d'échappement à évacuation du condensat

Publications (1)

Publication Number Publication Date
EP2627887A1 true EP2627887A1 (fr) 2013-08-21

Family

ID=44719832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11761509.6A Ceased EP2627887A1 (fr) 2010-10-14 2011-09-20 Recyclage des gaz d'échappement à évacuation du condensat

Country Status (4)

Country Link
US (1) US20130219886A1 (fr)
EP (1) EP2627887A1 (fr)
DE (1) DE102010048465A1 (fr)
WO (1) WO2012048786A1 (fr)

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Also Published As

Publication number Publication date
DE102010048465A1 (de) 2012-04-19
WO2012048786A1 (fr) 2012-04-19
US20130219886A1 (en) 2013-08-29

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