US20040226286A1 - Process for controlled addition of a reducing agent into nitrogen oxides containing exhaust gas - Google Patents

Process for controlled addition of a reducing agent into nitrogen oxides containing exhaust gas Download PDF

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US20040226286A1
US20040226286A1 US10/838,367 US83836704A US2004226286A1 US 20040226286 A1 US20040226286 A1 US 20040226286A1 US 83836704 A US83836704 A US 83836704A US 2004226286 A1 US2004226286 A1 US 2004226286A1
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exhaust gas
reducing agent
nitrogen oxides
catalyst
engine
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US10/838,367
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Par Gabrielsson
Ingvard Bjorn
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Topsoe AS
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    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • 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
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/281—Interface circuits between sensors and control unit
    • F02D2041/285—Interface circuits between sensors and control unit the sensor having a signal processing unit external to the engine control unit
    • 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
    • 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 present invention relates to reduction of content of nitrogen oxides (NOx) by means of selective catalytic reduction with injection of reducing agents onboard vehicles with internal combustion engines.
  • NOx nitrogen oxides
  • SCR selective catalytic reduction
  • ammonia or urea act as a reducing agent.
  • the reducing agent reacts with nitrogen oxides from the exhaust to form nitrogen and water.
  • Ammonia or urea is added to the exhaust gas from an external source either as in aqueous solution or as urea as a solid or dissolved in water. If urea is used, it will be thermally decomposed to ammonia and isocyanic acid by the heat in the exhaust or hydrolysed over the SCR catalyst to form carbon dioxide and ammonia.
  • V 2 O5-WO 3 /TiO 2 catalysts are employed in the SCR process even though other base metal oxides have SCR activity.
  • An electronic control unit is usually employed to meter urea or ammonia reducing agent injection, which must correspond to the potential of the catalyst to reduce NOx.
  • the reduction capability depends on the activity of the catalyst, the temperature of the exhaust, the massflow of the exhaust and the NOx concentration in the exhaust.
  • the oxygen content and the water content of the exhaust affects the reduction capability but are considered to have a minor effect.
  • the most important parameters like exhaust mass flow, NOx concentration and catalyst temperature are in the known methods and systems for NOx control in exhaust from diesel fueled engines determined by the means of sensors, arranged in the exhaust gas channel of the engine.
  • the measured data are then transmitted to the ECU, where the data are converted to an appropriate output signal by means of an algorithm to a metering pump for the controlled injection of reducing agent into the exhaust gas stream.
  • the invention is an improved method for controlled addition of a reducing agent into nitrogen oxides containing vehicle engine exhaust gas by reaction of the nitrogen oxides with a reducing agent in contact with a selective reducing catalyst amount of the reducing agent being added to the exhaust gas is metered on base of exhaust gas values and/or engine values, which values are determined by means of sensors and sensor data being communicated to an electronic control unit for metering the amount of the reducing agent being added to the exhaust gas, the improvement of which comprises communicating the sensor data by means of a serial interface to the electronic control unit.
  • the invention provides furthermore an improved system for metering a reducing agent into nitrogen oxides containing exhaust gas for catalytic reduction of the nitrogen oxides, which system is useful for operating the inventive method.
  • the essential feature of the method and system according to the invention is transmission of sensor data with a serial interface to the electronic control unit (ECU), whereby electromagnetic disturbances induced by electrical field on the vehicle are avoided.
  • the sensors are equipped with the serial interface, which makes it possible to arrange the ECU in a remote position from the sensors.
  • an ECU being equipped with a serial interface instead of a circuit for measurements of analogue signals from the sensors allows monitoring of the air flow transmitted by a serial interface mounted directly on or in close connection to air flow sensors, which could be placed in the engine compartment.
  • Measured values of the intake airflow to the engine and oxygen content in the exhaust allows calculating the exhaust mass flow. From the oxygen content in the exhaust and the inlet airflow, the fuel consumption is derived. The fuel consumption, as a molar flow, is then added to the engine inlet air molar flow giving the exhaust molar flow. By knowing an average molar weight of the exhaust gas, the exhaust gas massflow can be calculated with accuracy accurate enough for this application.
  • Determination of exhaust massflow by calculation as described above is based on data measured by low cost sensors for intake airflow and for oxygen concentration instead of use of expensive exhaust gas flow sensors arranged in the exhaust gas channel as typically applied in prior art.
  • the NOx mass flow is calculated by the ECU based on data of the NOx concentration in the exhaust gas upstream the catalyst and the point for urea injection, transmitted from a NOx sensor or other analyser.
  • the NOx sensor is equipped with a serial interface, preferable a Controller Area Network, CAN interface, able to communicate with the electronic control unit via a serial link.
  • CANbus was originally developed by Bosch for automotive applications. It is a high speed serial data network engineered to exist in harsh electrical environments. It answers also a lot of the issues of predictability and latency in its basic design—by using non-destructive priority based message arbitration.
  • the temperature in the exhaust has to be measured.
  • the temperature sensors could be equipped with a serial interface, preferable a CAN interface, able to communicate with the electronic control unit via a serial link as schematically shown in the attached Figure.

Abstract

Process for controlled addition of a reducing agent into nitrogen oxides containing exhaust gas being contacted with a selective reducing catalyst for abatement of the nitrogen oxides by reaction with the reducing agent in contact with the catalyst, comprising the steps of
determining mass flow of combustion air passed to the engine;
determining concentration of nitrogen oxides in the exhaust gas prior to contact with the catalyst;
determining temperature of the exhaust gas at inlet of the catalyst;
determining temperature of the exhaust gas at outlet of the catalyst; and
communicating determined values of the air mass flow, the nitrogen oxides concentration and the inlet and outlet temperature to an electronic control unit and calculating amount of reducing agent to be injected into the exhaust gas prior to contact with the catalyst.

Description

  • The present invention relates to reduction of content of nitrogen oxides (NOx) by means of selective catalytic reduction with injection of reducing agents onboard vehicles with internal combustion engines. [0001]
  • Reduction of NOx from internal combustion engines is conventionally performed through selective catalytic reduction (SCR). In the SCR ammonia or urea act as a reducing agent. When adsorbed on a catalytic surface, the reducing agent reacts with nitrogen oxides from the exhaust to form nitrogen and water. Ammonia or urea is added to the exhaust gas from an external source either as in aqueous solution or as urea as a solid or dissolved in water. If urea is used, it will be thermally decomposed to ammonia and isocyanic acid by the heat in the exhaust or hydrolysed over the SCR catalyst to form carbon dioxide and ammonia. [0002]
  • Commonly used V[0003] 2O5-WO3/TiO2 catalysts are employed in the SCR process even though other base metal oxides have SCR activity.
  • An electronic control unit (ECU) is usually employed to meter urea or ammonia reducing agent injection, which must correspond to the potential of the catalyst to reduce NOx. The reduction capability depends on the activity of the catalyst, the temperature of the exhaust, the massflow of the exhaust and the NOx concentration in the exhaust. The oxygen content and the water content of the exhaust affects the reduction capability but are considered to have a minor effect. The most important parameters like exhaust mass flow, NOx concentration and catalyst temperature are in the known methods and systems for NOx control in exhaust from diesel fueled engines determined by the means of sensors, arranged in the exhaust gas channel of the engine. [0004]
  • The measured data are then transmitted to the ECU, where the data are converted to an appropriate output signal by means of an algorithm to a metering pump for the controlled injection of reducing agent into the exhaust gas stream. [0005]
  • In the known systems data from the sensors are transmitted to the ECU in an analogous manner, which makes them vulnerable towards electromagnetic disturbances induced by the electrical field on the vehicle. It is thus required to arrange the ECU in a close distance to the sensors to limit electromagnetic scrambling of sensor data. [0006]
  • Limitations with respect to location of the ECU in relation to the sensors represent a serious problem in particular in retrofitting existing vehicles with a system for NOx reduction comprising sensors and an ECU. In Nox reduction systems of the above kind it will furthermore be difficult to arrange the ECU in the vehicle when for instance engine data which have to be monitored by sensors in the engine compartment are utilised in controlling reducing agent injection.[0007]
  • It is thus the general object of this invention to provide an improvement in the known systems and methods for controlled addition of a reducing agent in particular with respect to transmission of sensor data. [0008]
  • Accordingly, the invention is an improved method for controlled addition of a reducing agent into nitrogen oxides containing vehicle engine exhaust gas by reaction of the nitrogen oxides with a reducing agent in contact with a selective reducing catalyst amount of the reducing agent being added to the exhaust gas is metered on base of exhaust gas values and/or engine values, which values are determined by means of sensors and sensor data being communicated to an electronic control unit for metering the amount of the reducing agent being added to the exhaust gas, the improvement of which comprises communicating the sensor data by means of a serial interface to the electronic control unit. [0009]
  • The invention provides furthermore an improved system for metering a reducing agent into nitrogen oxides containing exhaust gas for catalytic reduction of the nitrogen oxides, which system is useful for operating the inventive method. [0010]
  • The essential feature of the method and system according to the invention is transmission of sensor data with a serial interface to the electronic control unit (ECU), whereby electromagnetic disturbances induced by electrical field on the vehicle are avoided. The sensors are equipped with the serial interface, which makes it possible to arrange the ECU in a remote position from the sensors. [0011]
  • As further an advantage, an ECU being equipped with a serial interface instead of a circuit for measurements of analogue signals from the sensors allows monitoring of the air flow transmitted by a serial interface mounted directly on or in close connection to air flow sensors, which could be placed in the engine compartment. [0012]
  • For carrying out the inventive process, it will be necessary to monitor at least one of nitrogen oxide concentration, exhaust gas temperature at inlet of the reducing catalyst and exhaust gas temperature at outlet of the reducing catalyst. It is furthermore preferred to determine certain engine operation values, in particular flow amount of engine intake air. [0013]
  • Measured values of the intake airflow to the engine and oxygen content in the exhaust allows calculating the exhaust mass flow. From the oxygen content in the exhaust and the inlet airflow, the fuel consumption is derived. The fuel consumption, as a molar flow, is then added to the engine inlet air molar flow giving the exhaust molar flow. By knowing an average molar weight of the exhaust gas, the exhaust gas massflow can be calculated with accuracy accurate enough for this application. [0014]
  • Determination of exhaust massflow by calculation as described above is based on data measured by low cost sensors for intake airflow and for oxygen concentration instead of use of expensive exhaust gas flow sensors arranged in the exhaust gas channel as typically applied in prior art. [0015]
  • The NOx mass flow is calculated by the ECU based on data of the NOx concentration in the exhaust gas upstream the catalyst and the point for urea injection, transmitted from a NOx sensor or other analyser. For the same reasons like for the airflow sensor, the NOx sensor is equipped with a serial interface, preferable a Controller Area Network, CAN interface, able to communicate with the electronic control unit via a serial link. [0016]
  • CANbus was originally developed by Bosch for automotive applications. It is a high speed serial data network engineered to exist in harsh electrical environments. It answers also a lot of the issues of predictability and latency in its basic design—by using non-destructive priority based message arbitration. [0017]
  • In order to foresee the NOx reduction potential of the catalyst the temperature in the exhaust has to be measured. For the same reasons like for the airflow sensor, the temperature sensors could be equipped with a serial interface, preferable a CAN interface, able to communicate with the electronic control unit via a serial link as schematically shown in the attached Figure. [0018]

Claims (7)

1. Improved process for controlled addition of a reducing agent into nitrogen oxides containing vehicle engine exhaust gas by reaction of nitrogen oxides with a reducing agent in contact with a selective reducing catalyst amount of the reducing agent being added to the exhaust gas is metered on base of exhaust gas values and/or engine values, which values are determined by means of sensors and sensor data being communicated to an electronic control unit for metering the amount of the reducing agent being added to the exhaust gas, the improvement of which comprises communicating the sensor data by means of a serial interface to the electronic control unit.
2. Process of claim 1, wherein the reducing agent contains or is urea and/or ammonia.
3. Process of claim 1, wherein the exhaust gas values being determined are at least one of nitrogen oxide concentration, exhaust gas temperature at inlet the reducing catalyst, exhaust gas temperature at outlet of the reducing catalyst and oxygen content in the exhaust gas.
4. Process of claim 1, wherein the engine values comprise flow amount of engine intake air.
5. Process of claim 1, wherein the electronic control unit is arranged in the vehicle engine compartment.
6. Process of claim 1, wherein the electronic control unit is an existing unit for controlling operation of the engine.
7. System for controlled addition of a reducing agent into nitrogen oxides containing vehicle engine exhaust gas comprising at least a sensor for providing data on exhaust gas composition and condition and/or a sensor for engine operation, and an electronic control unit for processing of the data and for metering the addition of the reducing agent into the exhaust gas, wherein the sensors are equipped with a serial interface for transmission of sensor data to the electronic control unit.
US10/838,367 2003-05-13 2004-05-05 Process for controlled addition of a reducing agent into nitrogen oxides containing exhaust gas Abandoned US20040226286A1 (en)

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EP (1) EP1477655A1 (en)
JP (1) JP2004340146A (en)
CN (1) CN1609420A (en)
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RU (1) RU2004114304A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070042495A1 (en) * 2005-08-22 2007-02-22 Detroit Diesel Corporation Method of controlling injection of a reducing agent in an engine emissions control system
US20090056315A1 (en) * 2007-08-30 2009-03-05 Gm Global Technology Operations, Inc. Method for reducing nh3 release from scr catalysts during thermal transients

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006004170A1 (en) * 2006-01-27 2007-08-02 Pierburg Gmbh Thermolysis assembly in exhaust pipe upstream of and heated by oxidation catalytic converter reduces automotive nitric oxide emissions
DE102006061732A1 (en) * 2006-12-28 2008-07-03 Robert Bosch Gmbh Liquid reducing agent dosage device for reduction of nitrogen oxides in exhaust gas, has storage container connected with work container, and storage pump for pumping liquid reducing agent from storage container to work container
FR2919666B1 (en) * 2007-08-03 2009-10-09 Peugeot Citroen Automobiles Sa SYSTEM FOR MANAGING A DISTRIBUTION CIRCUIT OF A REAGENT IN AN EXHAUST LINE
CN102998355B (en) * 2012-12-17 2016-01-13 潍柴动力股份有限公司 A kind of method and system of engine off-line test discharged nitrous oxides
SE542332C2 (en) * 2018-04-24 2020-04-14 Scania Cv Ab Method and system for control of an activation of at least one liquid sensitive sensor

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5842341A (en) * 1996-08-02 1998-12-01 Toyota Jidosha Kabushiki Kaisha Exhaust emission purification apparatus for an internal combustion engine
US6082102A (en) * 1997-09-30 2000-07-04 Siemens Aktiengesellschaft NOx reduction system with a device for metering reducing agents
US6119448A (en) * 1997-08-21 2000-09-19 Man Nutzfahrzeuge Ag Method for metering a reducing agent into NOx -containing exhaust gas of an internal combustion engine
US6173568B1 (en) * 1997-09-16 2001-01-16 Siemens Aktiengesellschaft Method and device for operating an internal combustion engine operating with an excess of air
US6209313B1 (en) * 1997-11-07 2001-04-03 Siemens Aktiengesellschaft Method of reducing the Nox content in the exhaust gas of a diesel internal combustion engine
US6209315B1 (en) * 1998-04-30 2001-04-03 Siemens Akteingesellschaft Method and device for exhaust gas after-treatment in an internal combustion engine equipped with an SCR catalyst
US6343468B1 (en) * 1997-02-06 2002-02-05 Siemens Aktiengesellschaft Method and device for controlling a combustion system and for catalytic cleaning of exhaust gas, and combustion system
US6357226B2 (en) * 1998-10-22 2002-03-19 Chrysler Corporation Control system for lean air-fuel ratio NOx catalyst system
US6415602B1 (en) * 2000-10-16 2002-07-09 Engelhard Corporation Control system for mobile NOx SCR applications
US20020103592A1 (en) * 2000-09-29 2002-08-01 Helmut Gross Method and device for controlling operational sequences
US6427439B1 (en) * 2000-07-13 2002-08-06 Ford Global Technologies, Inc. Method and system for NOx reduction
US6446600B1 (en) * 1997-07-03 2002-09-10 Daimler-Benz Aktiengesellschaft Sensor arrangement and engine management device for a combustion engine
US20030033799A1 (en) * 2001-08-09 2003-02-20 Gerd Scheying Exhaust gas treatment unit and measuring instrument for ascertaining a concentration of a urea-water solution
US20030200022A1 (en) * 2002-02-05 2003-10-23 Michael Streichsbier Apparatus and method for simultaneous monitoring, logging, and controlling of an industrial process
US6725651B2 (en) * 2000-11-16 2004-04-27 Toyota Jidosha Kabushiki Kaisha Reducing agent for emission control system, reducing-agent supply device, and emission control system using the reducing agent
US6737033B1 (en) * 1998-03-31 2004-05-18 Siemens Aktiengesellschaft Method and device for the catalytic removal of a pollutant contained in an exhaust gas of a combustion system
US6755014B2 (en) * 2002-03-29 2004-06-29 Mitsubishi Fuso Truck And Bus Corporation NOx cleaning apparatus and NOx cleaning method for internal combustion engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19807215C2 (en) * 1998-02-20 2000-06-08 Siemens Ag Control system for an internal combustion engine

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5842341A (en) * 1996-08-02 1998-12-01 Toyota Jidosha Kabushiki Kaisha Exhaust emission purification apparatus for an internal combustion engine
US6343468B1 (en) * 1997-02-06 2002-02-05 Siemens Aktiengesellschaft Method and device for controlling a combustion system and for catalytic cleaning of exhaust gas, and combustion system
US6446600B1 (en) * 1997-07-03 2002-09-10 Daimler-Benz Aktiengesellschaft Sensor arrangement and engine management device for a combustion engine
US6119448A (en) * 1997-08-21 2000-09-19 Man Nutzfahrzeuge Ag Method for metering a reducing agent into NOx -containing exhaust gas of an internal combustion engine
US6173568B1 (en) * 1997-09-16 2001-01-16 Siemens Aktiengesellschaft Method and device for operating an internal combustion engine operating with an excess of air
US6082102A (en) * 1997-09-30 2000-07-04 Siemens Aktiengesellschaft NOx reduction system with a device for metering reducing agents
US6209313B1 (en) * 1997-11-07 2001-04-03 Siemens Aktiengesellschaft Method of reducing the Nox content in the exhaust gas of a diesel internal combustion engine
US6737033B1 (en) * 1998-03-31 2004-05-18 Siemens Aktiengesellschaft Method and device for the catalytic removal of a pollutant contained in an exhaust gas of a combustion system
US6209315B1 (en) * 1998-04-30 2001-04-03 Siemens Akteingesellschaft Method and device for exhaust gas after-treatment in an internal combustion engine equipped with an SCR catalyst
US6357226B2 (en) * 1998-10-22 2002-03-19 Chrysler Corporation Control system for lean air-fuel ratio NOx catalyst system
US6427439B1 (en) * 2000-07-13 2002-08-06 Ford Global Technologies, Inc. Method and system for NOx reduction
US20020103592A1 (en) * 2000-09-29 2002-08-01 Helmut Gross Method and device for controlling operational sequences
US6415602B1 (en) * 2000-10-16 2002-07-09 Engelhard Corporation Control system for mobile NOx SCR applications
US6725651B2 (en) * 2000-11-16 2004-04-27 Toyota Jidosha Kabushiki Kaisha Reducing agent for emission control system, reducing-agent supply device, and emission control system using the reducing agent
US20030033799A1 (en) * 2001-08-09 2003-02-20 Gerd Scheying Exhaust gas treatment unit and measuring instrument for ascertaining a concentration of a urea-water solution
US20030200022A1 (en) * 2002-02-05 2003-10-23 Michael Streichsbier Apparatus and method for simultaneous monitoring, logging, and controlling of an industrial process
US6755014B2 (en) * 2002-03-29 2004-06-29 Mitsubishi Fuso Truck And Bus Corporation NOx cleaning apparatus and NOx cleaning method for internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070042495A1 (en) * 2005-08-22 2007-02-22 Detroit Diesel Corporation Method of controlling injection of a reducing agent in an engine emissions control system
US20090056315A1 (en) * 2007-08-30 2009-03-05 Gm Global Technology Operations, Inc. Method for reducing nh3 release from scr catalysts during thermal transients
US8713917B2 (en) 2007-08-30 2014-05-06 GM Global Technology Operations LLC Method for reducing NH3 release from SCR catalysts during thermal transients

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EP1477655A1 (en) 2004-11-17

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