WO2010015453A1 - Procédé et dispositif pour commander un processus de traitement secondaire de gaz d'échappement - Google Patents

Procédé et dispositif pour commander un processus de traitement secondaire de gaz d'échappement Download PDF

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Publication number
WO2010015453A1
WO2010015453A1 PCT/EP2009/057499 EP2009057499W WO2010015453A1 WO 2010015453 A1 WO2010015453 A1 WO 2010015453A1 EP 2009057499 W EP2009057499 W EP 2009057499W WO 2010015453 A1 WO2010015453 A1 WO 2010015453A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gas
air
internal combustion
hdt
combustion engine
Prior art date
Application number
PCT/EP2009/057499
Other languages
German (de)
English (en)
Inventor
Peter Bauer
Tahar Zrilli
Original Assignee
Continental Automotive Gmbh
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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Priority to US13/000,271 priority Critical patent/US20110094208A1/en
Priority to CN2009801243614A priority patent/CN102076934B/zh
Publication of WO2010015453A1 publication Critical patent/WO2010015453A1/fr

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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
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/07—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas flow rate or velocity meter or sensor, intake flow meters only when exclusively used to determine exhaust gas parameters
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/12—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle exterior
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a method and a device for controlling an exhaust gas aftertreatment in an internal combustion engine with an SCR catalytic converter.
  • the components of the exhaust aftertreatment system also function in the desired manner over a long period of operation and errors are reliably detected.
  • nitrogen oxides can be produced during a combustion process in a combustion chamber of the corresponding internal combustion engine.
  • the resulting nitrogen oxides are then part of an exhaust gas of the internal combustion engine.
  • the exhaust tract of the internal combustion engine can be metered with a reducing agent, by means of which the nitrogen oxides in an SCR catalyst can react to give acceptable nitrogen and water.
  • the reducing agent used is preferably ammonia.
  • the ammonia can be recovered by heating a complex salt and gaseously metered into the exhaust tract.
  • the exhaust tract may be fed with an aqueous urea solution which, due to the heat in the exhaust tract, is then at least partially hydrolyzed to ammonia which reacts with the nitrogen oxides of the exhaust gas in the SCR catalyst. If the nitrogen oxides are not completely reduced, they contribute to environmental pollution. If an excess of ammonia is metered and the ammonia exits the exhaust tract, this leads to a significant odor nuisance in an environment of the internal combustion engine.
  • the object on which the invention is based is to provide a method and a device for controlling an exhaust gas aftertreatment in an internal combustion engine, which contribute to a particularly advantageous reduction of a pollutant content of an exhaust gas of the internal combustion engine.
  • the invention is characterized by a method and an apparatus for controlling an exhaust gas aftertreatment for a Internal combustion engine having at least one cylinder with a combustion chamber and an exhaust tract, in which an SCR catalyst is arranged.
  • a parameter for a water content of an exhaust gas in the exhaust tract upstream of the SCR catalytic converter of the internal combustion engine is determined, and depending on the characteristic for the water content of the exhaust gas, an actuating signal for an actuator for introducing ammonia into the exhaust gas is determined and adjusted the actuator.
  • the advantage of considering the water content of an exhaust gas in the exhaust tract upstream of the SCR catalyst is that the water / moisture content in the SCR catalyst can be taken into account in the injection amount and injection timing of the reductant to be supplied.
  • an introduction of suitable heating measures for the catalyst is possible. This makes it easier to avoid NOx emissions.
  • avoidance of blockage of the SCR catalyst by high water / moisture content in the SCR catalyst is possible.
  • information on the moisture-dependent aging behavior of the SCR catalyst is possible.
  • the parameter for the water content of the exhaust gas is determined as a function of the air moisture content of the ambient air supplied to the internal combustion engine. This allows an accurate determination of the water / moisture content in the SCR catalyst.
  • the parameter for the water content of the exhaust gas is determined depending on the temperature of the ambient air supplied to the internal combustion engine. This has the advantage that an accurate determination of the moisture content of the ambient air and thus the exhaust gas is possible.
  • the air moisture content and / or the temperature is determined by means of one or more sensors whose measurement signal is representative or whose measurement signals are representative of the air moisture content and / or the temperature of the ambient air supplied to the internal combustion engine.
  • a position of the actuator affects an ammonia mass, which is supplied to the SCR catalyst. This is an easy way to measure the ammonia mass in a suitable manner.
  • Figure 1 shows an internal combustion engine with a control device
  • Figure 2 shows a block diagram of a method for controlling an exhaust aftertreatment for the internal combustion engine.
  • FIG. 1 shows an internal combustion engine with an intake tract 10, an engine block 12, a cylinder head 13 and an exhaust tract 14.
  • the intake tract 10 preferably comprises a throttle valve 15 and a suction pipe 17.
  • the intake manifold 17 is directed towards a cylinder Z1 at the intake passage in FIG a combustion chamber 26 of the engine block 12 out.
  • the engine block 12 includes a crankshaft 18, which is coupled via a connecting rod 20 with a piston 21 of the cylinder Zl.
  • the cylinder head 13 comprises a valve drive with a gas inlet valve 22 and a gas outlet valve 24.
  • the cylinder head 13 further comprises an injection valve 28 and a spark plug 30.
  • the injection valve 28 may also be arranged in the intake pipe 17.
  • an SCR catalyst 34 is arranged for the reduction of NOx.
  • the internal combustion engine is further associated with a control device 35, which is associated with sensors that detect different measured variables and can each determine the value of the measured variables.
  • the control device 35 is designed to determine manipulated variables as a function of at least one of the measured variables, which variables can then be converted into one or more actuating signals for controlling actuators by means of corresponding actuators.
  • the control device 35 is here as a device for controlling an exhaust aftertreatment designated .
  • the actuators are, for example, the throttle valve 15, the gas inlet and gas outlet valves 22, 24, the injection valve 28 or the spark plug 30.
  • the sensors include a pedal position sensor 36, which detects an accelerator pedal position of an accelerator pedal 38. Furthermore, the internal combustion engine has a humidity sensor 40, which is arranged upstream of the throttle valve 15 and detects there a humidity of the intake air. A temperature sensor 42 upstream of the throttle valve 15 detects an intake air temperature.
  • a NOx sensor 44 Downstream of the SCR catalyst 34, a NOx sensor 44 is arranged, which detects a NOx concentration of the exhaust gas.
  • any subset of said sensors may be present, or additional sensors may be present.
  • cylinder Zl In addition to the cylinder Zl further cylinders Z2 to Z4 are preferably provided, which are also associated with corresponding actuators and optionally sensors.
  • a program can be stored in a program memory of the control device 35 and executed during operation of the internal combustion engine.
  • the program is shown in FIG.
  • the figure shows a temperature model 100 for the calculation of the temperature of the exhaust gas of the internal combustion engine from an exhaust gas mass flow EXH_MASS_FLOW, an exhaust gas temperature TEMP_TUR_UP before a turbine of the internal combustion engine and a total injection quantity MF_TOT of fuel.
  • a modeled exhaust gas temperature TEMP_EXH_MDL is determined therefrom.
  • a measured exhaust gas temperature TEMP_EXH_MES is determined and compared in a comparison block 102 with the modeled exhaust gas temperature TEMP_EXH_MDL, whereby an exhaust gas temperature TEMP_EXH is determined as output variable of the comparison block 102 in a suitable manner.
  • a modeled water content HDT_EXH_MDL of the exhaust gas is determined from an air temperature AIR_TEMP of the ambient air, an air humidity content AIR_HDT of the ambient air, an injection quantity MF_CYL into a cylinder, a total air charge MASS_GAS_CYL in the cylinder and a combustion efficiency CMB_EFF of the internal combustion engine.
  • the air humidity content AIR_HDT of the ambient air is preferably detected by the humidity sensor 40, the air temperature AIR_TEMP of the ambient air is preferably detected by the temperature sensor 42 upstream of the throttle valve 15.
  • the air humidity content AIR_HDT and the air temperature AIR_TEMP of the ambient air may also be determined by an empirical model of weather data.
  • a modeled catalyst temperature TEMP_CAT_MDL is determined as a function of the exhaust gas temperature TEMP_EXH, the exhaust gas mass flow EXH_MASS_FLOW, a vehicle speed VS, the temperature AIR_TEMP of the ambient air supplied to the internal combustion engine, a heat capacity C_CAT and a catalyst volume VOL_CAT of the SCR catalytic converter 34 and a second multiplier 114.
  • the determined value of the water content HDT_EXH of the exhaust gas is supplied to a second characteristic map 112 and from this a correction factor FAC_HDT_COR of the moisture content is determined and likewise fed to the second multiplier 114.
  • a modeled urea injection quantity UREA_INJ_MDL for injecting urea into the exhaust gas in the exhaust gas tract 14 is determined by means of a urea injection model 116, inter alia from the exhaust gas mass flow EXH_MASS_FLOW and a NOx content NOX in the exhaust gas, and fed to a third multiplier 120.
  • a catalyst temperature TEMP_CAT is determined and fed to a third map 118.
  • a correction factor UREA_INJ_COR for the urea injection amount is determined and also supplied to the third multiplier 120.
  • the injection amount UREA_INJ of urea into the exhaust tract 14 upstream of the SCR catalyst 34 is determined.
  • the SCR catalytic converter 34 is impeded in its function by a high water or moisture content. Since attachment of water or moisture in the SCR catalyst 34 may result in additional aging of the SCR catalyst 34, this method further enables the aging of the SCR catalyst 34 to be accurately determined.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour commander un processus de traitement secondaire de gaz d'échappement pour un moteur à combustion interne pourvu d'au moins un cylindre (Z1-Z4), comprenant une chambre de combustion (26) et un circuit d'échappement (14) dans lequel est placé un catalyseur SCR (34). Un paramètre caractéristique d'une teneur en eau (HDT_EXH) d'un gaz d'échappement est déterminé dans le circuit d'échappement (14) en amont du catalyseur SCR (34) du moteur à combustion interne. En fonction de ce paramètre caractéristique de la teneur en eau (HDT_EXH) du gaz d'échappement, un signal de commande est déterminé pour un organe de commande permettant d'introduire de l'ammoniac dans le gaz d'échappement et l'organe de commande est réglé en conséquence.
PCT/EP2009/057499 2008-08-05 2009-06-17 Procédé et dispositif pour commander un processus de traitement secondaire de gaz d'échappement WO2010015453A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/000,271 US20110094208A1 (en) 2008-08-05 2009-06-17 Method and device for controlling an exhaust gas post-treatment
CN2009801243614A CN102076934B (zh) 2008-08-05 2009-06-17 用于控制废气后处理的方法和装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008036418.5 2008-08-05
DE102008036418A DE102008036418B4 (de) 2008-08-05 2008-08-05 Verfahren und Vorrichtung zum Steuern einer Abgasnachbehandlung

Publications (1)

Publication Number Publication Date
WO2010015453A1 true WO2010015453A1 (fr) 2010-02-11

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PCT/EP2009/057499 WO2010015453A1 (fr) 2008-08-05 2009-06-17 Procédé et dispositif pour commander un processus de traitement secondaire de gaz d'échappement

Country Status (4)

Country Link
US (1) US20110094208A1 (fr)
CN (1) CN102076934B (fr)
DE (1) DE102008036418B4 (fr)
WO (1) WO2010015453A1 (fr)

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CN103726907B (zh) * 2014-01-13 2015-10-28 东南大学 一种应用于南极科考支撑平台柴油发电机的烟气监控除尘系统
US9453449B2 (en) * 2015-01-06 2016-09-27 Robert Bosch Gmbh Diesel exhaust system and method for controlling exhaust fluid dosing
DE102015224929B4 (de) 2015-12-11 2017-08-10 Continental Automotive Gmbh Verfahren zur Überprüfung eines Feuchtigkeitssensors eines Dieselmotors
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EP3246540B1 (fr) * 2016-05-17 2019-07-10 Volvo Car Corporation Dispositif de post-traitement de gaz d'échappement à double convertisseur catalytique
US10087803B2 (en) * 2016-08-04 2018-10-02 Ford Global Technologies, Llc Method and system for an exhaust catalyst
DE102017122933A1 (de) * 2016-10-13 2017-11-23 FEV Europe GmbH Regelungsverfahren für ein Motorsystem
DE102016222418A1 (de) * 2016-11-15 2018-05-17 Robert Bosch Gmbh Verfahren zur Regelung einer Füllung eines Speichers eines Katalysators für eine Abgaskomponente
DE102022117681B3 (de) 2022-07-14 2023-12-07 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Betreiben einer Abgasanlage mit einem SCR-Katalysator für eine Verbrennungskraftmaschine, Verbrennungskraftmaschine mit einer Abgasanlage sowie ein Kraftfahrzeug mit einer Verbrennungskraftmaschine

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Also Published As

Publication number Publication date
DE102008036418A1 (de) 2010-02-11
CN102076934B (zh) 2013-05-29
US20110094208A1 (en) 2011-04-28
DE102008036418B4 (de) 2010-04-29
CN102076934A (zh) 2011-05-25

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