GB2476828A - Diesel engine exhaust line with catalysts and sensors - Google Patents

Diesel engine exhaust line with catalysts and sensors Download PDF

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Publication number
GB2476828A
GB2476828A GB1000382A GB201000382A GB2476828A GB 2476828 A GB2476828 A GB 2476828A GB 1000382 A GB1000382 A GB 1000382A GB 201000382 A GB201000382 A GB 201000382A GB 2476828 A GB2476828 A GB 2476828A
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United Kingdom
Prior art keywords
scr
sensor
exhaust line
diesel engine
diesel
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.)
Withdrawn
Application number
GB1000382A
Other versions
GB201000382D0 (en
Inventor
Igor Zanetti
Davide Mercuri
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Filing date
Publication date
Application filed by GM Global Technology Operations LLC filed Critical GM Global Technology Operations LLC
Priority to GB1000382A priority Critical patent/GB2476828A/en
Publication of GB201000382D0 publication Critical patent/GB201000382D0/en
Publication of GB2476828A publication Critical patent/GB2476828A/en
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • 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]
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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

Landscapes

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

Abstract

Diesel engine 1 provided with an exhaust line 3 comprising a diesel oxidation catalyst, DOC 30, connected in series with a selective reduction catalyst, SCR 32, and a first NOx sensor 34 located upstream of the DOC. Preferably the first NOx sensor is located downstream of a turbine 41 of a turbocharger 4 and a diesel particulate filter, DPF 31, is located between the DOC and SCR. There may be a second NOx sensor 35 located downstream of the SCR and a control system 5 connected to the first NOx sensor. A method for operating a Diesel engine is also claimed which comprises measuring a NOx concentration and an oxygen concentration upstream of the DOC and measuring a NOx concentration downstream of the SCR.

Description

DIESEL EI'Gfl METHC*) POR OPERATING IT
TEL FID
The present invention relates to a Diesel engine for a motor vehicle and to a method for operating it.
BAKJND
A Diesel engine is normally provided with an exhaust gas after-treatment system, for degrading and/or removing the pollutants from the exhaust gas emitted by the Diesel engine, before discharging it in the environment.
The after-treatment system generally comprises an exhaust line for leading the exhaust gas from the Diesel engine to the environment, a Diesel Oxidation Catalyst (IXC) located in the exhaust line, for oxi-dizing hydrocarbon (HC) and carbon monoxides (CC) into carbon dioxide (C02) and water (H20), and a Diesel Particulate Filter (DPF) located in the exhaust line downstream the XC, for removing diesel particu-late matter or soot from the exhaust gas.
In order to reduce NO emission, most after-treatment systems further comprises a Selective Reduction Catalyst (SCR), which is located in the exhaust line downstream the DPF.
SCR is a catalytic device in which the nitrogen oxides (NO) contained in the exhaust gas are reduced into diatonic nitrogen (N2) and water (H20), with the aid of a gaseous reducing agent, typically ammonia (NH3) that can be obtained by urea (CH4N2O) thermo-hydrolysis and that is absorbed inside catalyst.
Urea is mixed with the exhaust gas by means of an urea injector that is located in the exhaust line between the DPF and the SCR.
In order to operate these after-treatment systems, the engine control system (ECU) is generally equipped with an oxygen sensor located in the exhaust line upstream the EOC, and with at least one N0 sensor located in the exhaust line downstream the DPF and upstream the urea injector.
The oxygen sensor is provided for the ECU to measure the oxygen (02) concentration in the exhaust gas, in order to determine the air fuel ratio A within the engine cylinders.
The NO,( sensor is provided for the ECU to measure the NO concentra-tion in the exhaust gas, in order to calculate the amount of urea to be injected during the engine working, and in order to estimate the NH3 storage level into the SCR (even when the urea injection is shut off).
Because of the many sensors, the after-treatment systems can become quite complicated and costly.
DISOSUR
An object of the present invention is to simplify the after-treatment control system, in order to achieve a cost reduction.
This and other objects are attained by the characteristics of the in- vention as reported in independent claims. The dependent claims re- cite preferred and/or especially advantageous features of the inven-tion.
An embodiment of the invention provides a Diesel engine for a motor vehicle provided with an exhaust line comprising at least a Di- esel Oxidation Catalyst DOC serial connected with a Selective Reduc- tion Catalyst SCR, and an NO sensor located in the exhaust line up-stream the DOC.
It is known that, in order to measure the nitrogen oxides concentra-tion, the NOD, sensor necessarily implies a measurement of the oxygen concentration.
Therefore, the NO sensor located in the exhaust line upstream the DOC can be effectively configured for measuring both the NO and 02 con-centrations.
While the NO concentration can be used for calculating the amount of urea to be injected during the engine working and for estimating the NH3 storage into the SCR, the oxygen concentration can be used for de- termining the air fuel ratio A, without using a dedicated oxygen sen-sor.
From the above, it follows that the control system can be simplified by removing the oxygen sensor that is normally located upstream the LXX, and by repositioning the NO sensor from downstream the DPF to upstream the DOC.
This layout results in an advantageous cost reduction due to the oxy-gen sensor removal.
Another benefit is the quicker heating up of the NO sensor with re-spect to the normal configuration, in which it is located downstream the DPF.
A further benefit is the improvement of temperature stability of the NO sensor.
According to a preferred aspect, the NO sensor is located downstream a turbine of a turbocharger.
The turbocharger has the function of increasing the density of air entering the Diesel engine, to thereby creating more power at the crankshaft.
The NO sensor is preferably located downstream the turbine of the turbocharger, in order to subject the sensor itself to less severe operating conditions and increase its durability.
According to another preferred aspect, the Diesel engine comprises a DFF located in the exhaust line between the EXJC and the SCR.
The DPF has the function of removing diesel particulate matter or soot from the exhaust gas that flows in the exhaust line.
The DPF is preferably located in closed coupled position between the EXJC and the SCR, in order to improve its periodical regeneration re- ducing as much as possible the thermal loss (and therefore fuel con-sumption and Oil Dilution) on the exhaust pipe.
As a matter of fact, the regeneration provides for heating the DPF by means of extra fuel injections that are ejected unburnt from the en-gine, and are channeled by the exhaust line towards the DOC, where the unburnt fuel is effectively oxidized, in order to increase the temperature of the exhaust gases that subsequently pass through the DPF.
According to a further preferred aspect, the Diesel engine comprises a control system, typically the Engine Control Unit ECU, which is connected to the NO sensor, to thereby reading the measurement sig-nals of the latter.
According to another preferred aspect, the Diesel engine comprises a second NO sensor located in the exhaust line downstream the SCR.
This second NO sensor is useful for measuring the amount of nitrogen oxides (and possible ammonia slip) that is emitted in the environ-ment, in order to diagnose the efficiency of the SCR.
A further embodiment of the invention provides a method for op-erating a Diesel engine provided with an exhaust line for discharging exhaust gas from the engine to the environment, wherein said exhaust line comprises at least a Diesel Oxidation Catalyst DOC serial con-nected with a Selective Reduction Catalyst SCR.
The method provides for measuring at least an N concentration in the exhaust gas upstream the EXJC.
In this way, it is possible to determine the NO concentration in the exhaust gas that flows through the SCR, without using the NO sensor that is normally located in the exhaust line between the LXX and the SCR.
According to a preferred aspect, the method provides for measuring also an oxygen (02) concentration in the exhaust gas upstream the EXJC.
In this way, it is possible to control the operation of the engine, for example by determining the air fuel ratio A within the engine cylinders.
According to another preferred aspect, the method provides for mea-suring both the NO concentration and the oxygen concentration through a NO sensor located in the exhaust line upstream the DOC.
In this way, it is possible to achieve an advantageous cost reduction by removing the oxygen sensor that is normally located upstream the DOC, and by repositioning the NO sensor from downstream the DPF to upstream the EXJC.
According to a further preferred aspect, the method provides for mea-suring a second NO concentration in the exhaust gas downstream the 3CR.
The NO concentration downstream the SCR can be used by the control system for measuring the amount of nitrogen oxides that is actually emitted in the environment, for example in order to diagnose the ef-ficiency of the SCR.
The NOD, concentration downstream the SCR can also be used by the con-trol system for other purpose.
ERI DESRIPTIc OF THE DRWDGS The present invention will now be described, by way of example, with reference to the accompanying drawing, in which: -figure 1 schematically illustrates a Diesel engine according to an embodiment of the invention.
DEIL DESRIP2I4 \n embodiment of the invention is hereinafter disclosed with reference to a turbocharged Diesel engine 1 of a vehicle.
The turbocharged Diesel engine 1 comprises: an intake manifold 10 and an exhaust manifold 11; an intake line 2 for feeding ambient air from the environment, through an air filter 20, to the intake manifold 10; an exhaust line 3 for discharging the exhaust gas from the exhaust manifold 11 into the environment; and a turbocharger 4 which com-prises a compressor 40 located in the intake line 2, for compressing the air stream flowing therein, and a turbine 41 located in the ex-haust line 3, for driving said compressor 40.
The turbocharged Diesel engine 1 further comprises an intercooler 21, located in the intake line 2 downstream the compressor 40 of turbo-charger 4, for cooling the air stream before it reaches the intake manifold 10.
The turbocharged Diesel engine 1 further comprises a diesel oxidation catalyst (lC) 30 located in the exhaust line 3 downstream the tur-bine 41 of turbocharger 4, for degrading residual hydrocarbons (HC) and carbon oxides (CO) contained in the exhaust gas, and a diesel particulate filter (DPF) 31 located in the exhaust line 3 downstream the EXJC 30, for capturing and removing diesel particulate matter (soot) from the exhaust gas.
In order to reduce NO, emission, the turbocharged Diesel engine 1 fur- ther comprises a Selective Reduction Catalyst (SCR) 32, which is lo-cated in the exhaust line 3 downstream the DPF 31.
In the SCR 32, the nitrogen oxides (NO) contained in the exhaust gas are reduced into diatonic nitrogen (N2) and water (H20), with the aid of a gaseous reducing agent, typically ammonia (NH3) that can be ob-tained by urea (CH4N2O) thermo-hydrolysis and that is absorbed inside catalyst.
The urea is mixed with the exhaust gas by means of an urea injector 33 that is located in the exhaust line 3, between the DPF 31 and the SCR 32.
The turbocharged Diesel engine 1 is operated by a microprocessor based controller (ECU) 5, which is connected to a plurality of sen-sors (many of which are not shown).
In particular, the ECU 5 is connected to a NO sensor 34 that is lo-cated in the exhaust line 3 downstream the turbine 41 of turbocharger 4 and upstream the EXJC 30.
The NO sensor 34 is provided for the ECU 5 to measure the nitrogen oxides (NO) concentration in the exhaust gas upstream the SCR 32, in order to calculate the amount of urea to be injected during the en- gine working, to thereby controlling the urea injector 33 accord- ingly, and in order to estimate the NH3 storage into the SCR 32 it-self.
While measuring the nitrogen oxides concentration, the NO sensor 34 necessarily implies also the measurement of the oxygen 02 concentra-tion.
In the present embodiment, the N0 sensor 34 is thus also provided for the ECU 5 to measure the oxygen concentration in the exhaust gas up-stream the EXJC 30, in order to determine the air fuel ratio X within the engine cylinders, to thereby controlling the engine working ac-cordingly.
The ECU 5 is further connected to a second NO sensor 35 that is lo-cated in the exhaust gas line 3 downstream the SCR 32.
This second NO sensor 35 can be used by the ECU 5 for measuring the amount of nitrogen oxides that is emitted in the environment, in or-der to diagiiose the efficiency of the SCR 32.
The second NO sensor 35 can also be used by the ECU 5 for other pur-pose.
While the present invention has been described with respect to cer- tam preferred embodiments and particular applications, it is under-stood that the description set forth herein above is to be taken by way of example and not of limitation. Those skilled in the art will recognize various modifications to the particular embodiments are within the scope of the appended claims. Therefore, it is intended that the invention not be limited to the disclosed embodiments, but that it has the full scope permitted by the language of the following claims. cL

Claims (9)

1. Diesel engine (1) for a motor vehicle, the engine being provided with an exhaust line (3) comprising a Diesel Oxidation Catalyst EXDC (30) connected in series with a Selective Reduction Catalyst SCR (32), and a first NO sensor (34) located in the exhaust line (3) up-stream the LXX (30).
2. Diesel engine according to claim 1, wherein the NO sensor (34) is located downstream a turbine (41) of a turbocharger (4).
3. Diesel engine according to claim 1 or 2, wherein the engine corn-prises a diesel particulate filter DPF (31) located in the exhaust line (3) between the DOC (30) and the SCR (32).
4. Diesel engine according to any of the preceding claims, wherein the engine comprises a control system (5) connected to said NO sensor (34).
5. Diesel engine according to any of the preceding claims, wherein the engine comprises a second NO sensor (35) located in the exhaust line (3) downstream the SCR (32).
6. Method for operating a Diesel engine (1) provided with an exhaust line (3) comprising at least a Diesel Oxidation Catalyst LXJC (30) serial connected with a Selective Reduction Catalyst SCR (32), where-in the method provides for measuring at least an NO concentration in the exhaust gas upstream the LCC (30).
7. Melhod according to claim 6, wherein the method further provides for measuring also oxygen concentration in the exhaust gas upstream the LXJC (30).
8. Method according to claim 6 and 7, wherein the method provides for measuring both the NO concentration and the oxygen concentration through a NO sensor located in the exhaust line (3) upstream the LOC (30).
9. Method according to any of the claims form 6 to 8, wherein the method further provides for measuring a second NO concentration in the exhaust gas downstream the SCR (32).
GB1000382A 2010-01-11 2010-01-11 Diesel engine exhaust line with catalysts and sensors Withdrawn GB2476828A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1000382A GB2476828A (en) 2010-01-11 2010-01-11 Diesel engine exhaust line with catalysts and sensors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1000382A GB2476828A (en) 2010-01-11 2010-01-11 Diesel engine exhaust line with catalysts and sensors

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Publication Number Publication Date
GB201000382D0 GB201000382D0 (en) 2010-02-24
GB2476828A true GB2476828A (en) 2011-07-13

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060272317A1 (en) * 2005-06-03 2006-12-07 Brown David B Exhaust treatment diagnostic using a temperature sensor
WO2008014074A2 (en) * 2006-07-25 2008-01-31 Gm Global Technology Operations, Inc. Method and apparatus for urea injection in an exhaust aftertreatment system
US20080066455A1 (en) * 2006-09-20 2008-03-20 Gm Global Technology Operations, Inc. Method and Apparatus to Control Injection of a Reductant into an Exhaust Gas Feedstream
US20090173064A1 (en) * 2008-01-03 2009-07-09 Gm Global Technology Operations, Inc. EXHAUST SYSTEM WITH IMPROVED NOx EMISSION CONTROL
US20090266059A1 (en) * 2008-04-23 2009-10-29 Caterpillar Inc. Exhaust system implementing in situ calibration
US20090272099A1 (en) * 2008-04-30 2009-11-05 Phanindra Garimella Apparatus, system, and method for determining the degradation of an scr catalyst

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060272317A1 (en) * 2005-06-03 2006-12-07 Brown David B Exhaust treatment diagnostic using a temperature sensor
WO2008014074A2 (en) * 2006-07-25 2008-01-31 Gm Global Technology Operations, Inc. Method and apparatus for urea injection in an exhaust aftertreatment system
US20080066455A1 (en) * 2006-09-20 2008-03-20 Gm Global Technology Operations, Inc. Method and Apparatus to Control Injection of a Reductant into an Exhaust Gas Feedstream
US20090173064A1 (en) * 2008-01-03 2009-07-09 Gm Global Technology Operations, Inc. EXHAUST SYSTEM WITH IMPROVED NOx EMISSION CONTROL
US20090266059A1 (en) * 2008-04-23 2009-10-29 Caterpillar Inc. Exhaust system implementing in situ calibration
US20090272099A1 (en) * 2008-04-30 2009-11-05 Phanindra Garimella Apparatus, system, and method for determining the degradation of an scr catalyst

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