WO1994003711A1 - Procede et dispositif pour determiner l'etat de charge de filtres a particules - Google Patents

Procede et dispositif pour determiner l'etat de charge de filtres a particules Download PDF

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Publication number
WO1994003711A1
WO1994003711A1 PCT/EP1993/002103 EP9302103W WO9403711A1 WO 1994003711 A1 WO1994003711 A1 WO 1994003711A1 EP 9302103 W EP9302103 W EP 9302103W WO 9403711 A1 WO9403711 A1 WO 9403711A1
Authority
WO
WIPO (PCT)
Prior art keywords
differential pressure
characteristic value
pressure measuring
measuring device
particle filter
Prior art date
Application number
PCT/EP1993/002103
Other languages
German (de)
English (en)
Inventor
Wolfgang Pfister
Walter Blaschke
Erwin Burner
Heinrich Wacker
Peter Steiner
Original Assignee
Firma J. Eberspächer
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 Firma J. Eberspächer filed Critical Firma J. Eberspächer
Priority to EP94906764A priority Critical patent/EP0654121A1/fr
Publication of WO1994003711A1 publication Critical patent/WO1994003711A1/fr

Links

Classifications

    • 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
    • F01N3/025—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 using fuel burner or by adding fuel to exhaust
    • 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
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method for determining the loading state of a particle filter provided in the exhaust system of a diesel engine, and to a device for carrying out the method.
  • This is preferably a diesel engine which is used in a motor vehicle.
  • the particle filters increasingly used for exhaust gas cleaning in diesel engines which, in addition to filtering out other harmful gas components of the engine exhaust gas, in particular for filtering out soot particles carried in the exhaust gas, must be subjected to frequent cleaning (regeneration) in order to maintain their functionality.
  • the thermal regeneration of particle filters has proven to be effective in the high temperature-controlled through the introduction of hot gases (about 700 ° C to '900 ° C) will ignite the "in the particulate filter soot particles contained and incinerated.
  • a heating gas flow generated by an engine-independent heating device is mixed with the engine gas in the particle filter which is permanently in the exhaust gas flow for the time of regeneration and is fed together with this into the particle filter Tet in order to achieve the above-mentioned gas temperature required for regeneration.
  • the manufacturers of particle filters specify specific, fixed operating intervals in which a thermal rain is to be carried out.
  • the regeneration intervals are selected so that even under extreme operating conditions of the engine, for example frequent short-distance operation with extreme soot formation in the engine exhaust gases, sufficient security is provided in the intervals so that the regeneration in any case can take place in good time before the described harmful effects occur.
  • the regeneration of a particle filter inevitably takes place in a low-soot engine operation at a point in time when it would not be necessary at all.
  • the regeneration intervals have been adapted to the particular operating conditions of a particle filter by taking into account the predominantly prevailing operating conditions, that is to say, for example, short-haul or long-haul operations, but this refined screening of the regeneration intervals has also proven to be too coarse in practice .
  • the invention is based on the object of proposing a method and a device which or which enables a simple determination of the actually given loading state of a particle filter, taking into account the given engine operating conditions.
  • an actual characteristic value is defined which is compared with a given limit characteristic value in order to initiate a regeneration process if the difference between the actual characteristic value and the limit characteristic value is sufficiently small, for example if the values match .
  • the limit characteristic value can be specified, for example, as a limit characteristic curve determined in test bench tests, taking into account various loading conditions and volume flows.
  • the level of the limit values depends on the level of the permitted torque drop due to the exhaust gas back pressure caused by the particle filter and the throttle point in the exhaust system.
  • an already existing, that is to say design-related, cross-sectional constriction in the exhaust system can preferably be used; in this case, the method according to the invention can be carried out without the installation of an additional throttle point in the exhaust gas duct of the exhaust gas system. All that is required on the exhaust gas system itself is the installation of the sensors that are required for recording the differential pressures.
  • the differential pressure in the exhaust system is measured in the region of a cross-sectional constriction, which results when the relatively large flow cross section of the particle filter is passed to the downstream part of the exhaust system, for example a pipe section .
  • a display device is preferably activated which, for example when the method according to the invention is used in a motor vehicle, notifies the motor vehicle driver of the critical loading state of the particle filter. This can then regenerate the particle filter according to one of the above Start the described regeneration process.
  • a further possibility is to couple the display device to a start device for automatically triggering one of the described regeneration methods, or to trigger the start device immediately if a critical difference value is determined, without first displaying the value .
  • a display device it proves to be particularly advantageous to display the actual characteristic value determined by the method according to the invention on the basis of an initial characteristic value having a defined difference from the limit characteristic value, continuously or at predetermined time intervals in order to progress to make the loading state visible from the outside, so that the necessity of carrying out a particle filter regeneration can be recognized in advance.
  • the device according to the invention for determining the loading state of a particle filter used in the exhaust system of a diesel engine, in particular used in a motor vehicle, has the features of claim 5.
  • a first differential pressure measuring device is provided in the area of the particle filter and a second differential pressure measuring device is provided in the area of a cross-sectional constriction present in the exhaust gas system. Furthermore, a computing device is provided which is used to form an actual characteristic value, starting from the two measured values measured by the pressure measuring devices, and for comparison of the actual characteristic value is determined with a predetermined limit characteristic value.
  • the second pressure measuring device is preferably arranged in the region of a throttle point which is already present in the exhaust system, which leads to the device according to the invention being implemented with a minimum of expenditure on equipment.
  • the determined actual characteristic value and / or its difference to the relevant limit characteristic value can be displayed by means of a display device, so that suitable measures for regeneration of the particle filter can be taken in good time.
  • a starting device which can be actuated as a function of the difference between the actual characteristic value and the limiting characteristic value and which, for example, starts a burner device for thermal regeneration of the particle filter.
  • the first differential pressure measuring device is arranged in the area of the particle filter and the second differential pressure measuring device in the transition area from the particle filter to a region of the exhaust system that is narrowed in cross-section and follows the particle filter, since the required pressure measuring devices are thus all in one relatively small area of the exhaust system can be summarized.
  • the differential pressure measuring devices each having two measuring sensors, in such a way that the second measuring sensor of the first pressure measuring device tig can be used as the first measuring device of the second pressure measuring device, so that the measurement of two differential pressures is carried out with only three sensors.
  • Fig. 1 a between components of a system installed Abgas ⁇ particulate filter having a first and a second measuring section for determining the differential pressure ⁇ ⁇ Pfilter unci there differential pressure at a subsequent throttling point
  • Fig. 3 is a flowchart showing the determination of the load state in a particle filter.
  • FIG. 1 shows a particle filter 10 which is installed in an exhaust system 11 of a motor vehicle (not shown in more detail) which is operated with a diesel engine.
  • the particle filter 10 is connected via flange connections 12, 13 on its input side to a prechamber 14 and on its output side to a reducer 15.
  • the prechamber 14 On the flow side, ie in the direction of the drive motor (not shown in more detail), the prechamber 14 is connected to an exhaust pipe 17 via a flange connection 16.
  • the reducing piece 15 is on the flow side, towards the end of the exhaust gas pipe leading to the outside.
  • a combustion chamber 19 is provided for the regeneration of the particle filter 10 and is used to heat a gas stream introduced into it through a feed 20.
  • the gas stream introduced into the pre-chamber 14 through the feed 20 is mixed with the exhaust gas stream flowing into the pre-chamber 14 through the exhaust pipe 17 to achieve the exhaust gas temperature necessary for the regeneration.
  • two differential pressure measuring devices 21, 22 are provided in the area of the particle filter 10 and the reducer 15, which, in the case of the differential pressure measuring device 21, for determining the pressure drop across the particulate filter 10, so Pfilter ⁇ 's ° as in the case of the differential pressure measuring means 22 for determining the pressure drop across the throttling point representing a reducer 15 so PDrossel' are used.
  • the differential pressure measuring device 21 has two sensors 23, 24, which are arranged immediately before or immediately after the particle filter 10.
  • the differential pressure measuring device 22 also has two sensors, namely the sensor 24 common to the differential pressure measuring device 21 in the gas inlet area of the reducer 15, and the sensor 25 in the gas outlet area of the reducer 15.
  • the pressure drop across the particle filter is 10 AP filters' over the pressure drop. case over the reducer 15 ⁇ PDrossel 'applied.
  • the upper function line represents a limit characteristic, for example ascertained in test bench tests, for a particle filter with the highest permissible loading state, the lower characteristic line stands for a particle filter in an unloaded, ie clean, state.
  • ⁇ P filter and ⁇ P throttle is the quotient of the pressure differences, that is to say the slope of the function line is given by a constant value.
  • the limit characteristic value GK for the critical loading state of the particle filter, from which regeneration must take place, is defined by the limit characteristic.
  • the actual characteristic value IK derived from the current in the operation of the particulate filter 10 renzdruckmeß sensoryen means of the differential 21, 22 determined Diffe ⁇ Renz pressure values / ⁇ Pfilter and pD ⁇ horses or their quotient formation.
  • FIG. 3 shows a possible procedure for determining the current loading state of a particle filter using a flow chart as an example.
  • the sensors 23, 24, 25 of the differential pressure measuring devices 21, 22 arranged as shown in FIG. 1 supply the differential pressure values as input variables for a computing device 26
  • quotient formation is carried out in the computing device 26 and the actual characteristic value IK determined in this way is subtracted from the limit characteristic value GK in order to calculate an actual differential value DI.
  • the actual difference value DI is then subjected to a comparison with a target difference value DS, which, shown in FIG. 2 by the cross-hatched area, represents a freely selectable tolerance offset from the limit characteristic.
  • a start signal is given to a start device for the regeneration burner (not shown here).
  • the actual difference DI is displayed on a display device, not shown here, so that a permanent display of the loading condition or whose change is possible over time.
  • the display device as a warning device and to activate the display device without forming a difference only if the actual characteristic value IK is equal to the limit characteristic value GK.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour déterminer l'état de charge d'un filtre à particules (10) installé dans le système d'échappement (11) d'un moteur Diesel. La baisse de pression DELTA pfiltre à travers le filtre à particules (10) est mesurée au moyen d'un dispositif de mesure de pression différentielle (21). La baisse de pression DELTA pétranglement produite à travers un rétrécissement transversal (15) du système d'échappement (11) est mesurée au moyen d'un second dispositif de mesure de pression différentielle. La valeur de pression mesurée dans le premier dispositif de mesure de pression différentielle (21) est mise en corrélation avec la valeur de pression mesurée dans le second dispositif de mesure de pression différentielle (22) afin d'obtenir la valeur caractéristique réelle (IK). La valeur caractéristique réelle (IK) est comparée à la valeur caractéristique limite (GK) afin d'induire un processus de régénération au cas où la différence serait suffisamment faible.
PCT/EP1993/002103 1992-08-06 1993-08-06 Procede et dispositif pour determiner l'etat de charge de filtres a particules WO1994003711A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94906764A EP0654121A1 (fr) 1992-08-06 1993-08-06 Procede et dispositif pour determiner l'etat de charge de filtres a particules

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4226055.8 1992-08-06
DE4226055A DE4226055C1 (de) 1992-08-06 1992-08-06 Verfahren und Vorrichtung zur Ermittlung des Beladungszustands von Partikelfiltern

Publications (1)

Publication Number Publication Date
WO1994003711A1 true WO1994003711A1 (fr) 1994-02-17

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Application Number Title Priority Date Filing Date
PCT/EP1993/002103 WO1994003711A1 (fr) 1992-08-06 1993-08-06 Procede et dispositif pour determiner l'etat de charge de filtres a particules

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EP (1) EP0654121A1 (fr)
DE (1) DE4226055C1 (fr)
WO (1) WO1994003711A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2802241A1 (fr) * 1999-12-14 2001-06-15 Toyota Motor Co Ltd Dispositif pour detecter un mauvais fonctionnement du systeme d'echappement d'un moteur
EP1296029A3 (fr) * 2001-09-19 2005-01-05 Robert Bosch Gmbh Méthode et dispositif de commande d'un moteur à combustion interne
WO2016133443A1 (fr) * 2015-02-17 2016-08-25 Scania Cv Ab Procédé et système de détermination de résistance à l'écoulement à travers un filtre à particules
CN107023365A (zh) * 2016-01-27 2017-08-08 丰田自动车株式会社 用于内燃机的排气控制***
EP4095363A1 (fr) * 2021-05-27 2022-11-30 Hug Engineering AG Procédé de détermination d'un besoin de régénération pour un filtre particulaire des gaz d'échappement, ainsi qu'installation de gaz d'échappement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059683B4 (de) * 2000-12-01 2007-10-04 Audi Ag Verfahren zur Überwachung eines Partikelfiltersystems im Abgasstrang einer Brennkraftmaschine
US8096171B2 (en) 2009-11-05 2012-01-17 Daimler Ag Diagnostic method for an internal combustion engine exhaust gas system that includes a particle filter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115722A1 (fr) * 1982-12-28 1984-08-15 Automobiles Peugeot Dispositif de commande du processus de régénération d'un filtre à particules placé sur l'échappement d'un moteur à allumage par compression
US4603550A (en) * 1984-03-08 1986-08-05 Nissan Motor Company, Limited Exhaust particle removing system for an internal combustion engine
EP0349788A1 (fr) * 1988-06-09 1990-01-10 IVECO FIAT S.p.A. Méthode et dispositif pour la commande de la régénération d'au moins un filtre à particules installé dans un moteur diesel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3132092B2 (ja) * 1990-11-16 2001-02-05 株式会社デンソー ダストフイルタの目詰り検知装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115722A1 (fr) * 1982-12-28 1984-08-15 Automobiles Peugeot Dispositif de commande du processus de régénération d'un filtre à particules placé sur l'échappement d'un moteur à allumage par compression
US4603550A (en) * 1984-03-08 1986-08-05 Nissan Motor Company, Limited Exhaust particle removing system for an internal combustion engine
EP0349788A1 (fr) * 1988-06-09 1990-01-10 IVECO FIAT S.p.A. Méthode et dispositif pour la commande de la régénération d'au moins un filtre à particules installé dans un moteur diesel

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2802241A1 (fr) * 1999-12-14 2001-06-15 Toyota Motor Co Ltd Dispositif pour detecter un mauvais fonctionnement du systeme d'echappement d'un moteur
FR2813098A1 (fr) * 1999-12-14 2002-02-22 Toyota Motor Co Ltd Dispositif pour detecter un mauvais fonctionnement du systeme d'echappement d'un moteur
EP1296029A3 (fr) * 2001-09-19 2005-01-05 Robert Bosch Gmbh Méthode et dispositif de commande d'un moteur à combustion interne
WO2016133443A1 (fr) * 2015-02-17 2016-08-25 Scania Cv Ab Procédé et système de détermination de résistance à l'écoulement à travers un filtre à particules
US10724418B2 (en) 2015-02-17 2020-07-28 Scania Cv Ab Method and a system for determining a flow resistance across a particulate filter
CN107023365A (zh) * 2016-01-27 2017-08-08 丰田自动车株式会社 用于内燃机的排气控制***
CN107023365B (zh) * 2016-01-27 2019-06-25 丰田自动车株式会社 用于内燃机的排气控制***
EP4095363A1 (fr) * 2021-05-27 2022-11-30 Hug Engineering AG Procédé de détermination d'un besoin de régénération pour un filtre particulaire des gaz d'échappement, ainsi qu'installation de gaz d'échappement
US11808196B2 (en) 2021-05-27 2023-11-07 Hug Engineering Ag Method of detecting a need for regeneration of an exhaust particulate filter, and exhaust system

Also Published As

Publication number Publication date
DE4226055C1 (de) 1994-09-15
EP0654121A1 (fr) 1995-05-24

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