EP0903477A2 - Procédé de régénération d'un piège pour les oxydes d'azote dans le système d'échappement d'un moteur à combustion interne - Google Patents

Procédé de régénération d'un piège pour les oxydes d'azote dans le système d'échappement d'un moteur à combustion interne Download PDF

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Publication number
EP0903477A2
EP0903477A2 EP98113275A EP98113275A EP0903477A2 EP 0903477 A2 EP0903477 A2 EP 0903477A2 EP 98113275 A EP98113275 A EP 98113275A EP 98113275 A EP98113275 A EP 98113275A EP 0903477 A2 EP0903477 A2 EP 0903477A2
Authority
EP
European Patent Office
Prior art keywords
nitrogen oxide
regeneration
lean
engine
regeneration cycle
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.)
Granted
Application number
EP98113275A
Other languages
German (de)
English (en)
Other versions
EP0903477A3 (fr
EP0903477B1 (fr
Inventor
Patrick Dr. Phlips
Klemens Grieser
Roland Erdmann
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.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
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 Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Publication of EP0903477A2 publication Critical patent/EP0903477A2/fr
Publication of EP0903477A3 publication Critical patent/EP0903477A3/fr
Application granted granted Critical
Publication of EP0903477B1 publication Critical patent/EP0903477B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents using means for controlling, e.g. purging, the absorbents or adsorbents
    • 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
    • F02D41/0275—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 NOx trap or adsorbent
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • F02D41/1461—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine
    • F02D41/1462—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration of the exhaust gases emitted by the engine with determination means using an estimation
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
    • 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
    • F02D2200/0806—NOx storage amount, i.e. amount of NOx stored on NOx trap
    • 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
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/187—Circuit arrangements for generating control signals by measuring intake air flow using a hot wire flow sensor

Definitions

  • the invention relates to a method for the regeneration of a Nitrogen oxide trap in the exhaust system of an internal combustion engine an electronic engine control system, depending on a variety of engine operating parameters determine whether the internal combustion engine lean or essentially stoichiometric air / fuel mixture is supplied and by the given first trigger conditions Basic regeneration cycle of the nitrogen oxide trap is triggered.
  • Such a nitrogen oxide trap is preferably used in conjunction with a conventional three-way catalytic converter in motor vehicles whose internal combustion engine is designed for lean operation (lean burn engine) in order to reduce the nitrogen oxide emissions which occur in particular in lean operation.
  • the nitrogen oxide molecules are attached to the coating of the trap and thus removed from the exhaust gas.
  • a regeneration cycle is required when a certain degree of saturation is reached.
  • a problem with known nitrogen oxide traps is that it occurs under certain operating conditions can that already bound nitrogen oxides unconverted from the Nitrogen oxide trap are released again. This occurs in particular then when lean of the engine in higher speed / torque ranges in one stoichiometric operation. if the Nitric oxide trap already at the time of this transition If there is a large amount of nitrogen oxide stored, it can Unconverted nitrogen oxides are released. Such Uncontrolled release of nitrogen oxides can do this lead to stringent exhaust gas tests despite satisfactory exhaust gas values fail in stationary operation.
  • the invention has for its object a method of to create the type mentioned above, with the emission peaks be avoided lean-stoichiometric at the transition, whereby to ensure that the engine in one possible large speed / torque range can be operated lean can.
  • This object is achieved in that a transition from the lean to the stoichiometric operating mode and if there are predetermined second ones Trigger conditions an additional regeneration cycle of the Nitrogen oxide trap is triggered. Through this additional regeneration cycle the nitrogen oxide trap before the transition to the regenerated stoichiometric mode, leaving an uncontrolled The release of stored nitrogen oxides is no longer possible is.
  • the regeneration cycles are preferred the invention, characterized in that the engine is a rich Air / fuel mixture is supplied.
  • the current nitrogen oxide uptake rate of Nitric oxide trap and one of those taken up by the nitrogen oxide trap Corresponding nitrogen oxide quantity value through temporal integration of the determined admission rate approximately it is determined by the engine controller that the Basic regeneration cycle triggered under the (first) condition is that the nitrogen oxide amount value is given a first Threshold exceeds and the additional regeneration cycle triggered under the (second) condition is that the nitrogen oxide amount value given a second Threshold that is lower than the first given Threshold is exceeded, whereby after execution of a Basic or additional regeneration cycle of the nitrogen oxide quantity value is reset in each case.
  • An additional regeneration the nitrogen oxide trap is therefore preferably not used every transition lean-stoichiometric, but only if a certain minimum amount of nitrogen oxides is also stored is. This eliminates unnecessary regeneration cycles, each with an increased fuel consumption are avoided.
  • the basic regeneration cycle timer controlled at regular intervals perform and the additional regeneration cycle at each Initiate lean-stoichiometric transition.
  • Alternative is it is still conceivable to have an additional regeneration cycle only under the additional trigger condition to allow that since a certain minimum time elapsed after the last regeneration is.
  • Embodiment of the invention can be provided that during operation of the internal combustion engine with a lean mixture in a predetermined Speed / torque range an additional regeneration cycle on the condition that a transition is triggered from a specified subrange of the lean speed / torque range into stoichiometric engine operation he follows.
  • the partial area of the lean operating area is preferably located in a range of higher speeds or Torques.
  • a regeneration of the Nitric oxide trap requires a rich regeneration air / fuel ratio based on a functional relationship depending on the exhaust gas temperature in the range of Nitrogen oxide trap and the exhaust gas mass flow is determined.
  • the so certain regeneration air / fuel ratio can preferably both during the basic and during the Additional regeneration cycle are used.
  • Basic regeneration time for regeneration with the regeneration air / fuel ratio can preferably be based on a functional relationship depending on the exhaust gas temperature and the exhaust gas mass flow in the range of Nitrogen oxide trap can be determined.
  • additional regeneration time required can preferably by multiplying the basic regeneration time by the ratio of the current nitrogen oxide quantity value to the first Threshold are determined. This takes into account that the nitrogen oxide trap when performing the additional regeneration cycle generally less than saved in the case of the basic regeneration cycle, so that the regeneration time can be reduced accordingly can to minimize the fuel consumption.
  • a fixed offset value is added at the regeneration times determined in the manner described above. This takes into account the time that the fat peak from Internal combustion engine over a three-way catalyst needs to to get to the nitrogen oxide trap.
  • a multi-cylinder internal combustion engine 10 from an electronic engine controller 12 that has a variety of input signals 24, e.g. the current engine speed, a signal from an air / mass flow sensor 30 in the intake duct or get the current position of the accelerator pedal, controlled.
  • the engine control leads to algorithms Control of an electronic throttle valve 20, one Ignition system 18 and an injection system 26.
  • the air / fuel ratio ⁇ of the supplied to the cylinders Mixtures can be changed within wide limits, in particular may be lean under certain operating conditions Air / fuel ratio can be set.
  • the engine exhaust are supplied to an exhaust gas treatment arrangement 28. This consists of a three-way catalyst 14 and a nitrogen oxide trap 16.
  • a temperature sensor 22 becomes the exhaust gas temperature in close proximity to the exhaust treatment arrangement 28 measured.
  • FIG. 2 shows the development over time of the nitrogen oxide quantity value X taken up by the nitrogen oxide trap, the set air / fuel ratio ⁇ and a value NO x representing the nitrogen oxide emissions.
  • the engine control calculates the current nitrogen oxide uptake rate in discrete time intervals based on a functional relationship depending on the current engine speed, engine torque, air / fuel ratio and exhaust gas temperature and exhaust gas mass flow and integrates this rate into a nitrogen oxide quantity value X. If this exceeds a threshold value S 1 (60), it is exceeded for a period of time T R1, a basic regeneration cycle with a regeneration air / fuel ratio of 0.75 was carried out and the nitrogen oxide quantity value was then reset to zero.
  • S 1 60
  • FIG. 3 A schematic engine torque / engine speed diagram is shown in FIG. 3.
  • the maximum engine torque M D depending on the speed n is given by the full load curve 46.
  • an area 42 lean operation of the internal combustion engine is initiated by the engine control; Above or to the right of this area, the motor is operated stoichiometrically in an area designated by 48. Uncontrolled releases of non-converted nitrogen oxides only occur in the case of transitions from a partial area 50 of the lean area 42 (for example 52, 54). An additional regeneration cycle is therefore only triggered when the engine control system detects a transition from the subarea 50 to the area 48.
  • an implementation of a monitoring loop which is carried out endlessly during engine operation according to the method according to the invention begins with the determination of the nitrogen oxide quantity value X (step 82).
  • step 84 X is compared to a first threshold value S 1 .
  • a basic regeneration cycle is triggered if this is exceeded.
  • an air / fuel ratio ⁇ R required for regeneration and the required basic regeneration time T R1 are determined in 86 as a function of the exhaust gas temperature and the exhaust gas mass flow in the area of the nitrogen oxide trap.
  • a basic regeneration cycle is then carried out at 88 and the nitrogen oxide quantity value X is reset to zero.
  • X is compared with a second, lower threshold value S 2 .
  • the engine controller If the engine controller detects a transition from the area 50 to the area 48 (FIG. 2) and the threshold value S 2 is exceeded, the engine controller triggers an additional regeneration cycle.
  • the additional regeneration time T R2 is reduced compared to T R1 by the ratio of the current nitrogen oxide quantity value X and the threshold value S 1 (step 94).
  • An additional regeneration cycle is then triggered at 96 and the nitrogen oxide quantity value X is reset to zero.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust Gas After Treatment (AREA)
EP98113275A 1997-09-18 1998-07-16 Procédé de régénération d'un piège pour les oxydes d'azote dans le système d'échappement d'un moteur à combustion interne Expired - Lifetime EP0903477B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19741079 1997-09-18
DE19741079A DE19741079C2 (de) 1997-09-18 1997-09-18 Verfahren zur Regeneration einer Stickoxidfalle im Abgassystem eines Verbrennungsmotors

Publications (3)

Publication Number Publication Date
EP0903477A2 true EP0903477A2 (fr) 1999-03-24
EP0903477A3 EP0903477A3 (fr) 2000-03-08
EP0903477B1 EP0903477B1 (fr) 2002-03-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98113275A Expired - Lifetime EP0903477B1 (fr) 1997-09-18 1998-07-16 Procédé de régénération d'un piège pour les oxydes d'azote dans le système d'échappement d'un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP0903477B1 (fr)
JP (1) JP4099272B2 (fr)
DE (2) DE19741079C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1083323A2 (fr) * 1999-09-09 2001-03-14 Toyota Jidosha Kabushiki Kaisha Dispositif d'épuration des gaz d'échappement d'un moteur à combustion interne
WO2001018367A1 (fr) * 1999-09-04 2001-03-15 Robert Bosch Gmbh Procede pour faire fonctionner un moteur a combustion interne
EP1054149A3 (fr) * 1999-05-18 2002-07-17 Toyota Jidosha Kabushiki Kaisha Contrôleur de moteur à combustion interne
RU2598968C2 (ru) * 2012-04-10 2016-10-10 Вольво Ластвагнар Аб Способ автоматической диагностики системы селективного каталитического восстановления
EP3098423A1 (fr) * 2015-05-11 2016-11-30 Toyota Jidosha Kabushiki Kaisha Appareil de contrôle pour moteur à combustion interne

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10020789C2 (de) * 1999-05-19 2003-05-08 Ford Global Tech Inc Verfahren und System für den Übergang zwischen magerem und stöchiometrischem Kraftstoff-Luft-Verhältnis in einem mit magerer Verbrennung betriebenen Motor
JP3854013B2 (ja) * 1999-06-10 2006-12-06 三菱電機株式会社 内燃機関の排出ガス浄化装置
DE19932301A1 (de) * 1999-07-10 2001-01-11 Volkswagen Ag Verfahren zur Regelung einer Regeneration eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten Speicherkatalysators
DE19963938A1 (de) * 1999-12-31 2001-07-12 Bosch Gmbh Robert Verfahren zum Betreiben eines Dreiwegekatalysators einer Brennkraftmaschine
DE10054005A1 (de) 2000-11-01 2002-05-08 Daimler Chrysler Ag Verfahren zum Betrieb einer Abgasreinigungsanlage mit Stickoxidspeicher
US6915630B2 (en) * 2003-01-27 2005-07-12 Ford Global Technologies, Llc Engine control for a vehicle equipped with an emission control device
DE202013008389U1 (de) * 2013-09-21 2014-12-22 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Steueranordnung zum Steuern einer Brennkraftmaschine eines Kraftfahrzeugs

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993025806A1 (fr) * 1992-06-12 1993-12-23 Toyota Jidosha Kabushiki Kaisha Systeme de limitation d'emission de gaz d'echappement pour moteur a combustion interne
DE69326417T2 (de) * 1992-06-12 2000-04-13 Toyota Jidosha K.K., Toyota Abgasemissionssteuerungssystem für verbrennungsmotoren
JP2692530B2 (ja) * 1992-09-02 1997-12-17 トヨタ自動車株式会社 内燃機関
DE19626835A1 (de) * 1995-07-08 1997-01-09 Volkswagen Ag Dieselbrennkraftmaschine mit NOx-Speicher
DE19607151C1 (de) * 1996-02-26 1997-07-10 Siemens Ag Verfahren zur Regeneration eines NOx-Speicherkatalysators

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1054149A3 (fr) * 1999-05-18 2002-07-17 Toyota Jidosha Kabushiki Kaisha Contrôleur de moteur à combustion interne
WO2001018367A1 (fr) * 1999-09-04 2001-03-15 Robert Bosch Gmbh Procede pour faire fonctionner un moteur a combustion interne
US6758034B1 (en) 1999-09-04 2004-07-06 Robert Bosch Gmbh Method for operating an internal combustion engine
RU2247251C2 (ru) * 1999-09-04 2005-02-27 Роберт Бош Гмбх Способ управления работой двигателя внутреннего сгорания
EP1083323A2 (fr) * 1999-09-09 2001-03-14 Toyota Jidosha Kabushiki Kaisha Dispositif d'épuration des gaz d'échappement d'un moteur à combustion interne
RU2598968C2 (ru) * 2012-04-10 2016-10-10 Вольво Ластвагнар Аб Способ автоматической диагностики системы селективного каталитического восстановления
EP3098423A1 (fr) * 2015-05-11 2016-11-30 Toyota Jidosha Kabushiki Kaisha Appareil de contrôle pour moteur à combustion interne
US10316776B2 (en) 2015-05-11 2019-06-11 Toyota Jidosha Kabushiki Kaisha Control apparatus for an internal combustion engine

Also Published As

Publication number Publication date
DE19741079C2 (de) 2001-10-18
DE19741079A1 (de) 1999-04-01
JPH11148338A (ja) 1999-06-02
JP4099272B2 (ja) 2008-06-11
EP0903477A3 (fr) 2000-03-08
EP0903477B1 (fr) 2002-03-20
DE59803414D1 (de) 2002-04-25

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