EP2891786A2 - Exhaust purification system for internal combustion engine - Google Patents
Exhaust purification system for internal combustion engine Download PDFInfo
- Publication number
- EP2891786A2 EP2891786A2 EP14191276.6A EP14191276A EP2891786A2 EP 2891786 A2 EP2891786 A2 EP 2891786A2 EP 14191276 A EP14191276 A EP 14191276A EP 2891786 A2 EP2891786 A2 EP 2891786A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rich control
- gear position
- stand
- judged
- execution conditions
- 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- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 31
- 238000000746 purification Methods 0.000 title claims description 15
- 239000003054 catalyst Substances 0.000 claims abstract description 53
- 230000005540 biological transmission Effects 0.000 claims abstract description 24
- 239000000446 fuel Substances 0.000 claims description 50
- 239000007789 gas Substances 0.000 description 34
- 230000002745 absorbent Effects 0.000 description 18
- 239000002250 absorbent Substances 0.000 description 18
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 15
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 8
- RZCJYMOBWVJQGV-UHFFFAOYSA-N 2-naphthyloxyacetic acid Chemical compound C1=CC=CC2=CC(OCC(=O)O)=CC=C21 RZCJYMOBWVJQGV-UHFFFAOYSA-N 0.000 description 6
- 101100310662 Homo sapiens SOX21 gene Proteins 0.000 description 6
- 102100030247 Transcription factor SOX-21 Human genes 0.000 description 6
- 231100001143 noxa Toxicity 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 229910052697 platinum Inorganic materials 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- -1 sulfuric acid ions Chemical class 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
- F02D41/023—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission in relation with the gear ratio shifting
-
- 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
- F02D41/028—Desulfurisation of NOx traps or adsorbent
-
- 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
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/604—Engine control mode selected by driver, e.g. to manually start particle filter regeneration or to select driving style
Definitions
- the rich control execution conditions stand when the engine operating state is in a rich control allowable area and it is judged that the rich control execution conditions do not stand when the engine operating state is outside the rich control allowable area.
- the rich control execution conditions in particular, the second execution condition, stand depends on the engine operating state, so the rich control execution conditions are liable to not stand for a long period of time. As a result, the opportunity for performance of rich control is liable to be reduced.
- FIG. 13 shows a routine for control of a flag XN. This routine is executed by interruption every certain time interval.
- FIG. 15 shows the routine for execution of exhaust purification control. This routine is executed by interruption every certain time interval.
- step 303 or step 308 the routine proceeds to the next step 312 where the target gear position GPT is calculated.
- step 313 it is judged if the target gear position GPT could be calculated.
- the processing cycle is ended.
- the routine proceeds to the next step 314 where an indication that the gear position of the transmission 25 should be changed to the target gear position GPT is displayed by the indicator 27. If changing the gear position to the target gear position GPT in accordance with the indication displayed on the indicator 27 by the vehicle operator, the first execution condition and the second execution condition stand. As a result, rich control for NO x release or SO x release is started.
- step 500 it is judged if rich control is currently being executed.
- the processing cycle ends.
- the routine proceeds to the next step 501 where the engine operating state EOCU when assuming shift up under a constant engine output is estimated.
- step 502 whether the second execution condition would not stand when assuming a shift up were performed under a constant engine output is judged based on the engine operating state EOCU and gear position when assuming shift up were performed.
- the routine jumps to the next step 504.
- the routine proceeds to the next step 503 where an indication that a shift up should not be performed is displayed by the indicator 27.
- the routine proceeds to step 504.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Transmission Device (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
- The present invention relates to an exhaust purification system for an internal combustion engine.
- Known in the art is an exhaust purification system for an internal combustion engine, wherein an NOx storage catalyst which stores NOx in exhaust gas when the inflowing exhaust gas is lean in air-fuel ratio and releases the stored NOx when the inflowing exhaust gas becomes rich in air-fuel ratio is arranged in an engine exhaust passage and wherein rich control which temporarily switches the air-fuel ratio of the exhaust gas which flows into the NOx storage catalyst to be rich by injecting additional fuel in the combustion chamber in a combustion stroke or exhaust stroke in order to release NOx or SOx from the NOx storage catalyst, is executed.
- In this regard, when executing rich control when, for example, the torque is considerably low, the rich control is liable to cause the torque to greatly fluctuate and the drivability to deteriorate. Further, when the engine speed is considerably high, if rich control is executed, a large amount of additional fuel is liable to become necessary for switching the air-fuel ratio of the exhaust gas which flows into the NOx storage catalyst to be rich or it becomes difficult for the NOx storage catalyst to reliably release NOx or SOx.
- Therefore, known in the art is an exhaust purification system for an internal combustion engine where when rich control should be executed, the engine operating state is used as the basis to judge if rich control execution conditions stand, rich control is allowed when it is judged that the rich control execution conditions stand and rich control is prohibited when it is judged that the rich control execution conditions do not stand (see PTL 1).
- PTL: Japanese Patent Publication No.
2007-154771A - However, in the above-mentioned exhaust purification system, whether the rich control execution conditions stand or not depends on the engine operating state, while the engine operating state depends on operation by the vehicle operator. Therefore, the rich control execution conditions are liable not to stand over a long period of time, that is, the opportunity for execution of rich control is liable to be reduced. As a result, NOx or SOx is liable not to be released from the NOx storage catalyst over a long period of time and NOx is liable to not be removed well.
- According to the present invention, there is provided an exhaust purification system for an internal combustion engine, the system arranging in an engine exhaust passage an NOx storage catalyst which stores NOx in exhaust gas when the inflowing exhaust gas is lean in air-fuel ratio and which releases the stored NOx when the inflowing exhaust gas becomes rich in air-fuel ratio, the system comprising a rich control means for executing a rich control which temporarily switches the air-fuel ratio of the exhaust gas which flows into the NOx storage catalyst to be rich by injecting additional fuel into a combustion chamber in a combustion stroke or exhaust stroke in order to release NOx or SOx from the NOx storage catalyst, the system judging if rich control execution conditions stand when rich control should be executed, based on the engine operating state, the system executing rich control when it is judged that the rich control execution conditions stand and prohibits rich control when it is judged that rich control execution conditions do not stand, characterized in that the system comprises a transmission with a gear position which is changed by a vehicle operator and an indicator which displays an indication relating to a change of the gear position of the transmission to a vehicle operator, that when it is judged that the rich control execution conditions do not stand while rich control should be executed, a gear position, where the rich control execution conditions would stand when assuming that the gear position were changed under a constant engine output, is found, and that the indicator is controlled to display to the vehicle operator an indication to change the gear position to the found gear position, whereby rich control is executed when the rich control execution conditions stand due to the change of the gear position to the found gear position by the vehicle operator.
- Preferably, it is judged that the rich control execution conditions stand when the engine operating state is in a rich control allowable area and it is judged that the rich control execution conditions do not stand when the engine operating state is outside the rich control allowable area.
- Preferably, the engine operating state is expressed by an engine load and an engine speed.
- Preferably, it is judged that the rich control execution conditions stand when the engine operating state is in the rich control allowable area and the gear position of the transmission is in a predetermined set gear position range and it is judged that the rich control execution conditions do not stand when the engine operating state is outside the rich control allowable area or the gear position of the transmission is outside the set gear position range.
- Preferably, it is judged that the rich control execution conditions stand when the engine operating state is in the rich control allowable area and the temperature of the NOx storage catalyst is in a predetermined set temperature range and it is judged that the rich control execution conditions do not stand when the engine operating state is outside the rich control allowable area or the temperature of the NOx storage catalyst is outside the set temperature range.
- Preferably, it is judged that the rich control execution conditions stand when the engine operating state is in the rich control allowable area and the vehicle speed is in a predetermined set vehicle speed range and it is judged that the rich control execution conditions do not stand when the engine operating state is outside the rich control allowable area or the vehicle speed is outside the set vehicle speed range.
- Preferably, it is judged if the rich control execution conditions would stand when assuming that the gear position were changed under a constant engine output when rich control is being executed and, when it is judged that the rich control execution conditions do not stand, the indicator is controlled to display to the vehicle operator an indication that the gear position should not be changed.
- It is possible to secure opportunities for rich control to be executed, therefore it is possible to remove NOx well.
-
- [
FIG. 1] FIG. 1 is an overview of an internal combustion engine. - [
FIG. 2] FIG. 2 is an overview of an indicator. - [
FIG. 3] FIGS. 3(A) and 3(B) are views which show display patterns of indicators. - [
FIG. 4] FIG. 4 is a cross-sectional view of a surface portion of an NOx storage catalyst. - [
FIG. 5] FIG. 5 is a view which explains injection of additional fuel. - [
FIG. 6] FIG. 6 is a time chart which explains rich control for NOx release. - [
FIG. 7] FIG. 7 is a view which shows a map of an NOx exhaust amount NOXA. - [
FIG. 8] FIG. 8 is a time chart which explains rich control for SOx release. - [
FIG. 9] FIG. 9 is a view which shows a map of an SOx exhaust amount SOXA. - [
FIG. 10] FIG. 10 is a view which shows a rich control allowable area AA. - [
FIG. 11] FIG. 11 is a view which explains a change of an engine operating state when a gear position is changed. - [
FIG. 12] FIG. 12 is a view which explains a change of an engine operating state when a gear position is changed. - [
FIG. 13] FIG. 13 is a flow chart which shows a control routine of a flag XN. - [
FIG. 14] FIG. 14 is a flow chart which shows a control routine of a flag XS. - [
FIG. 15] FIG. 15 is a flow chart which shows a control routine of exhaust purification. - [
FIG. 16] FIG. 16 is a flow chart which shows a control routine of an indicator. - [
FIG. 17] FIGS. 17(A), 17(B), and 17(C) are views which show display patterns of an indicator of another embodiment according to the present invention. - [
FIG. 18] FIG. 18 is a view which explains a change of an engine operating state when a gear position is changed. - [
FIG. 19] FIG. 19 is a flow chart which shows a control routine of an indicator in another embodiment according to the present invention. - Referring to
FIG. 1, 1 indicates a body of a compression ignition type internal combustion engine, 2 a combustion chamber of a cylinder, 3 an electromagnetic control type fuel injector for injecting fuel into acorresponding combustion chamber 2, 4 an intake manifold, and 5 an exhaust manifold. The intake manifold 4 is connected through anintake duct 6 to an outlet of acompressor 7a of anexhaust turbocharger 7, while the inlet of thecompressor 7a is connected through anintake introduction pipe 8 to anair cleaner 9. Inside theintake duct 6, an electrical controltype throttle valve 10 is arranged. Further, around theintake duct 6, acooling device 11 is arranged for cooling the intake air which flows through the inside of theintake duct 6. Further, inside theintake introduction pipe 8, an intakeair amount detector 12 is arranged. - On the other hand, the
exhaust manifold 5 is connected to an inlet of anexhaust turbine 7b of theexhaust turbocharger 7, while an outlet of theexhaust turbine 7b is connected through anexhaust pipe 13 to an NOx storage catalyst 14. An outlet of the NOx storage catalyst 14 is connected to aparticulate filter 15 for trapping particulate matter in the exhaust gas. At theparticulate filter 15, adifferential pressure sensor 16 is attached for detecting the differential pressure across theparticulate filter 15. - The
exhaust manifold 5 and the intake manifold 4 are connected with each other through an exhaust gas recirculation (hereinafter referred to as "EGR")passage 17. Inside theEGR passage 17, an electrical control typeEGR control valve 18 is arranged. Further, around the EGRpassage 17, acooling device 19 is arranged for cooling the EGR gas which flows through the inside of the EGRpassage 17. On the other hand, eachfuel injector 3 is connected through afuel feed pipe 20 to acommon rail 21. Thiscommon rail 21 is connected through an electronic control type variabledischarge fuel pump 22 to thefuel tank 23. The fuel which is stored in thefuel tank 23 is supplied through thefuel pump 22 to the inside of thecommon rail 21, while the fuel which is supplied to the inside of thecommon rail 21 is supplied through thefuel feed pipes 20 to thefuel injectors 3. Note that, in another embodiment, theinternal combustion engine 1 is comprised of a spark ignition type internal combustion engine. In this case, the fuel inside thefuel tank 23 is gasoline, CNG, hydrogen, etc. - The output shaft (not shown) of the
internal combustion engine 1 is connected to thetransmission 25. In the example which is shown inFIG. 1 , thetransmission 25 is comprised of a manual transmission. The gear position of thetransmission 25 is changed by the vehicle operator operating theshift lever 26. In another example, thetransmission 25 is comprised of an automatic transmission which is provided with a manual mode. In this manual mode, the gear position is changed by the vehicle operator operating the shift lever. Furthermore, anindicator 27 which displays an indication relating to the gear position of thetransmission 25 to the vehicle operator is provided. - The
electronic control unit 30 is comprised of a digital computer which is provided with components which are connected with each other by abidirectional bus 31 such as a ROM (read only memory) 32, RAM (random access memory) 33, CPU (microprocessor) 34,input port 35, andoutput port 36. As shown inFIG. 1 , the output signals of the intakeair amount detector 12 anddifferential pressure sensor 16 are input throughcorresponding AD converters 37 to aninput port 35. Theaccelerator pedal 40 is connected to aload sensor 41 which generates an output voltage proportional to the amount of depression L of theaccelerator pedal 40. The output voltage of theload sensor 41 is input through acorresponding AD converter 37 to theinput port 35. Furthermore, theinput port 35 is connected to acrank angle sensor 42 which generates an output pulse each time the crankshaft rotates by for example 15°. At theCPU 34, the output pulse from thecrank angle sensor 42 is used as the basis to calculate the engine speed N. Further, a signal indicating the position of theshift lever 26, that is, the gear position of thetransmission 25, is input to theinput port 35. On the other hand, theoutput port 36 is connected through acorresponding drive circuit 38 to thefuel injectors 3, an actuator for driving thethrottle valve 10,EGR control valve 18,fuel pump 22, andindicator 27. -
FIG. 2 shows one example of theindicator 27. Theindicator 27 is provided with an upward facing arrow shaped light 27a and downward facing arrow shaped light 27b. In the embodiment according to the present invention, an indication to change the gear position is displayed by theindicator 27 to the vehicle operator. When displaying an indication to shift up, that is, that the gear position should be changed to a higher speed, as shown inFIG. 3(A) , the upward facing light 27a is for example lit up or flashed green and the downward facing light 27b is extinguished. As a result, the vehicle operator is prompted to shift up. On the other hand, when displaying an indication to shift down, that is, that the gear position should be changed to a lower speed, as shown inFIG. 3(B) , the downward facing light 27b is for example lit up or flashed green and the upward facing light 27a is extinguished. As a result, the vehicle operator is prompted to shift down. Note that,FIG. 2 shows the case where thelights indicator 27 uses light to display an indication relating to gear position to the vehicle operator. In another embodiment, theindicator 27 uses sound, vibration, etc. to provide indication. Furthermore, in another embodiment, theindicator 27 not only displays an indication relating to the gear position, but also displays the current gear position. - On the other hand, the substrate of the NOx storage catalyst 14 which is shown in
FIG. 1 carries a catalyst carrier which is comprised of for example alumina.FIG. 4 illustrates the cross-section of the surface part of thiscatalyst carrier 45. As shown inFIG. 4 , on the surface of thecatalyst carrier 45, aprecious metal catalyst 46 is carried dispersed. Furthermore, a layer of an NOx absorbent 47 is formed on the surface of thecatalyst carrier 45. - In the example which is shown in
FIG. 4 , as theprecious metal catalyst 46, platinum Pt is used. As the component which forms the NOx absorbent 47, for example, at least one element which is selected from potassium K, sodium Na, cesium Cs, or other such alkali metal, barium Ba, calcium Ca, or other such alkali earth metal, lanthanum La, yttrium Y, or other such rare earth is used. - If referring to the ratio of the air and fuel (hydrocarbons) which are supplied into the engine intake passage and exhaust passage upstream of the
combustion chambers 2 and NOxstorage catalyst 14 as the air-fuel ratio of the exhaust gas, the NOx absorbent 47 absorbs NOx when the air-fuel ratio of the exhaust gas is lean and releases the absorbed NOx when the concentration of oxygen in the exhaust gas falls. - That is, if explaining the case of using barium Ba as an ingredient which forms the NOx absorbent 47 as an example, when the air-fuel ratio of the exhaust gas is lean, that is, when the oxygen concentration of the exhaust gas is high, the NO which is contained in the exhaust gas is oxidized on the
platinum Pt 46 and becomes NO2 on theplatinum Pt 46 as shown inFIG. 4 , next is absorbed in the NOx absorbent 47 where it bonds with the barium carbonate BaCO3 while diffuses in the form of nitric acid ions NO3 in the NOx absorbent 47. In this way, the NOx is absorbed in the NOx absorbent 47. So long as the oxygen concentration in the exhaust gas is high, NO2 is formed on the surface of theplatinum Pt 46. So long as the NOx absorption ability of the NOx absorbent 47 does not become saturated, NO2 is absorbed inside the NOx absorbent 47 whereby sulfuric acid ions NO3 - are generated. - As opposed to this, when the air-fuel ratio of the exhaust gas is switched from lean to rich or the stoichiometric air-fuel ratio, the oxygen concentration in the exhaust gas falls, so the reaction proceeds in the opposite direction (NO3 -→NO2) and therefore the sulfuric acid ions NO3 - in the NOx absorbent 47 are released in the form of NO2 from the NOx absorbent 47. Next, the released NOx is reduced by the HC and CO which are contained in the exhaust gas.
- Note that, sometimes NOx is temporarily adsorbed at the NOx absorbent 47. Therefore, if using the term "storage" as a term including both absorption and adsorption, the NOx storage catalyst 14 stores NOx in the exhaust gas when the air-fuel ratio of the inflowing exhaust gas is lean and releases and reduces the stored NOx when the air-fuel ratio of the inflowing exhaust gas becomes rich.
- Now then, in the
engine body 1, fuel is burned under an excess of oxygen. Therefore, the air-fuel ratio of the exhaust gas which flows into the NOx storage catalyst 14 is lean, so at this time, the NOx in the exhaust gas is stored in the NOx storage catalyst 14. However, if the engine operating time becomes longer, the amount of NOx which is stored in the NOx storage catalyst 14 becomes greater and finally the NOx storage catalyst 14 can no longer store NOx. - Therefore, in the embodiment according to the present invention, to make the NOx storage catalyst 14 release the NOx, the air-fuel ratio of the exhaust gas which flows into the NOx storage catalyst 14 is temporarily switched to rich. In this case, as shown in
FIG. 5 , separate from the main fuel Qm which is injected around compression top dead center (TDC), additional fuel Qa is injected from afuel injector 3 to acombustion chamber 2 in the combustion stroke or exhaust stroke. - If referring to this control as rich control for NOx release, as shown in
FIG. 6 , when the NOx amount NOX which is stored in the NOx storage catalyst 14 exceeds the allowable amount MAXN, rich control for NOx release is executed. As a result, the air-fuel ratio (A/F)in of the exhaust gas which flows into the NOx storage catalyst 14 is temporarily switched to rich and the NOx stored amount NOX is reduced. In the embodiment according to the present invention, the NOx stored amount NOX is for example calculated from the amount of NOx which is exhausted from the engine. That is, the NOx exhaust amount NOXA which is exhausted from the engine per unit time is stored as a function of the amount of depression L of theaccelerator pedal 40 and the engine speed N in the form of a map such as shown inFIG. 7 in advance in theROM 32. This NOx exhaust amount NOXA is repeatedly added to calculate the NOx stored amount NOX. - In this regard, the exhaust gas contains SOx, that is, SO2. If this SO2 flows into the NOx storage catalyst 14, this SO2 is oxidized on the
platinum Pt 46 and becomes SO3. Next, this SO3 is absorbed in the NOx absorbent 47 where it bonds with the barium carbonate BaCO3 while diffusing in the NOx absorbent 47 in the form of sulfuric acid ions SO4 2- whereby stable sulfate BaSO4 is generated. However, an NOx absorbent 47 has a strong basicity, so this sulfate BaSO4 is stable and hard to break down. If just making the air-fuel ratio of the exhaust gas rich, the sulfate BaSO4 remains as it is without breaking down. Therefore, inside the NOx absorbent 47, sulfate BaSO4 increases as time elapses and therefore the amount of NOx which the NOx absorbent 47 can absorb falls along with the elapse of time. - On the other hand, if making the air-fuel ratio of the exhaust gas which flows into the NOx storage catalyst 14 rich in the state of raising the temperature of the NOx storage catalyst 14 to the 600°C or more, that is, SOx release temperature, SOx is released from the NOx absorbent 47.
- Therefore, in the embodiment according to the present invention, to make the NOx storage catalyst 14 release the SOx, additional fuel QA is injected into the
combustion chamber 2 during the combustion stroke or exhaust stroke to maintain the temperature of the NOx storage catalyst 14 at the SOx release temperature or more while the air-fuel ratio of the exhaust gas which flows into the NOx storage catalyst 14 is temporarily switched to rich. - If referring to this control as rich control for SOx release, as shown in
FIG. 8 , rich control for SOx release is executed when the SOx amount SOX which is stored in the NOx storage catalyst 14 exceeds the allowable amount MAXS. As a result, the temperature of the NOx storage catalyst 14 is raised to the SOx release temperature TS or more and the air-fuel ratio (A/F)in of the exhaust gas which flows into the NOx storage catalyst 14 is temporarily switched to rich whereby the SOx stored amount SOX is reduced. In the embodiment according to the present invention, the SOx stored amount SOX is for example calculated from the amount of SOx which is exhausted from the engine. That is, the SOx exhaust amount SOXA which is exhausted from the engine per unit time is stored as a function of the amount of depression L of theaccelerator pedal 40 and the engine speed N in the form of the map which is shown inFIG. 9 in advance in theROM 32. This SOx exhaust amount SOXA is repeatedly added to calculate the SOx stored amount SOX. - Now then, in the embodiment according to the present invention, when rich control for NOx release or SOx release should be executed, it is judged based on the engine operating state if the rich control execution conditions stand. When the rich control execution conditions stand, rich control is executed, while when it is judged that the rich control execution conditions do not stand, rich control is prohibited.
- Specifically, the rich control execution conditions are comprised of a first execution condition and a second execution condition. First, it is judged if the first execution condition stands. When it is judged that the first execution condition stands, it is judged if the second execution condition stands. When it is judged that the second execution condition stands, rich control for NOx release or release of SOx is executed. When the first execution condition or the second execution condition does not stand, rich control for NOx release or SOx release is not executed.
- In the embodiment according to the present invention, when the temperature TC of the NOx storage catalyst 14 is in a predetermined set temperature range and the vehicle speed is within a predetermined set vehicle speed range, it is judged that the first execution condition stands, while when the temperature TC of the NOx storage catalyst 14 is outside the set temperature range or the vehicle speed is outside the set vehicle speed range, it is judged that the first execution condition does not stand. Further, when the engine operating state is in the predetermined rich control allowable area and the gear position of the
transmission 25 is within the predetermined set gear position range, it is judged that the second execution condition stands, while when the engine operating state is outside the rich control allowable area and the gear position of thetransmission 25 is outside the set gear position, it is judged that the second execution condition does not stand. In the embodiment according to the present invention, the engine operating state is expressed by a combination of the torque TRQ which expresses the engine load and the engine speed N.FIG. 10 shows one example of the rich control allowable area AA. - By doing this, the NOx storage catalyst 14 can reliably release NOx and SOx. Further, at this time, the drivability is kept from falling, the consumption of additional fuel Qa is reduced, and the NOx storage catalyst 14 is kept from being damaged by heat.
- In this regard, whether the rich control execution conditions, in particular, the second execution condition, stand depends on the engine operating state, so the rich control execution conditions are liable to not stand for a long period of time. As a result, the opportunity for performance of rich control is liable to be reduced.
- Therefore, in the embodiment according to the present invention, when rich control should be executed and if it is judged that the second execution condition does not stand, the gear position where the second execution conditions would stand when assuming the gear position were changed under a constant engine output is found as a target gear position. This will be explained while referring to
FIG. 11 . - In
FIG. 11 , a point P shows the engine operating state when the gear position is the N speed. In this case, the point P is outside the rich control allowable area AA, therefore the second execution condition does not stand. In this state, if a shift up were performed under a constant engine output, that is, if the gear position were changed to the (N+1) speed, the engine operating state would be changed to a point PU. This point PU is outside the rich control allowable area AA, therefore, the second execution condition still would not stand. As opposed to this, if a shift down were performed under a constant engine output, that is, if the gear position were changed to the (N-1) speed, the engine operating state would be changed to a point PD. The point PD is inside the rich control allowable area AA, therefore the second execution conditions would stand conditional on the (N-1) speed being in the set gear position range. As a result, the rich control execution conditions would stand. Therefore, in the example which is shown inFIG. 11 , the (N-1) speed is found as the target gear position. - If the target gear position is found, the
indicator 27 is used to display an indication that the gear position should be changed to the target gear position to the vehicle operator. Next, if the vehicle operator changes the gear position to the target gear position, the second execution conditions would stand, therefore the rich control execution conditions would stand. For this reason, rich control is executed. As a result, the opportunity for rich control to be executed is secured and NOx can be removed well. - Therefore, generally speaking, when rich control should be executed and it is judged that rich control execution conditions do not stand, the gear position where the rich control execution conditions would stand when assuming the gear position were changed under a constant engine output is found, the indicator is controlled to display an indication that the gear position should be changed to the found gear position to the vehicle operator, and when the vehicle operator changes the gear position to the found gear position and it is thereby judged that the rich control execution conditions would stand, the rich control is executed.
- The engine operating state after the gear position has been changed, that is, the combination of the torque TRQ and the engine speed N, is, for example, calculated from the engine operating state before change, the gear ratio at the gear position before change, and the gear ratio at the gear position after change. That is, if expressing the gear ratio, torque, and the engine speed before change of the gear position by R1, TRQ1, and N1 and expressing the gear ratio, torque, and the engine speed after change of the gear position by R2, TRQ2, and N2, the torque TRQ2 and the engine speed N2 after change of the gear position are expressed by (R1/R2) ·TRQ1 and (R2/R1) ·N1.
- Note that, in the example which is shown in
FIG. 12 , the point PD and the point PU are both outside the rich control allowable area AA. Therefore, even after a shift down or even after a shift up, the second execution condition would still not stand. It is sometimes not possible to find the target gear position. In this case, theindicator 27 does not display an indication. -
FIG. 13 shows a routine for control of a flag XN. This routine is executed by interruption every certain time interval. - Referring to
FIG. 13 , atstep 100, the NOx exhaust amount NOXA per unit time is calculated from the map which is shown inFIG. 7 . The NOx exhaust amount NOXA is cumulatively added to calculate the NOx stored amount NOX (NOX=NOX+NOXA). At thenext step 101, it is judged if the NOx stored amount NOX has exceeded the allowable value MAXN. When NOX≤MAXN, the processing cycle is ended. When NOX>MAXN, the routine proceeds fromstep 101 to step 102 where the flag XN is set (XN=1). This flag XN is set when rich control for NOx release should be executed (XN=1) and is reset when otherwise (XN=0). -
FIG. 14 shows a routine for control of a flag XS. This routine is executed by interruption every certain time interval. - Referring to
FIG. 14 , atstep 200, the SOx exhaust amount SOXA per unit time is calculated from the map which is shown inFIG. 9 . The SOx exhaust amount SOXA is cumulatively added to calculate the SOx stored amount SOX (SOX=SOX+SOXA). At thenext step 201, it is judged if the SOx stored amount SOX has exceeded the allowable value MAXS. When SOX≤MAXS, the processing cycle is ended. When SOX>MAXS, the routine proceeds fromstep 201 to step 202 where the flag XS is set (XS=1). This flag XS is set when rich control for SOx release should be executed (XS=1) and is reset when otherwise (XS=0). -
FIG. 15 shows the routine for execution of exhaust purification control. This routine is executed by interruption every certain time interval. - Referring to
FIG. 15 , atstep 300, it is judged if the flag XS has been set. When the flag XS is reset (XS=0), that is, when rich control for SOx release should not be executed, the routine proceeds to thenext step 301 where it is judged if the flag XN has been set. When the flag XN has been reset (XN=0), that is, when rich control for NOx release should not be executed, the processing cycle is ended. When the flag XN is set (XN=1), that is, when rich control for NOx release should be executed, the routine proceeds to thenext step 302 where it is judged if the first execution condition stands. When it is judged that the first execution condition does not stand, the processing cycle is ended. When it is judged that the first execution condition stands, the routine proceeds to thenext step 303 where it is judged if the second execution condition stands. When it is judged that the second execution condition stands, the routine proceeds to thenext step 304 where rich control for NOx release is executed. At the followingstep 305, it is judged if rich control for NOx release should be ended. When it is judged that rich control for NOx release should be ended, the processing cycle is ended. When it is judged that the rich control should be ended, the routine proceeds to step 306 where the flag XN is reset (XN=0) and the NOx stored amount NOX is cleared (NOX=0). - On the other hand, when the flag XS is set at step 300 (XS=1), that is, when rich control for SOx release should be executed, the routine proceeds to the
next step 307 where it is judged if the first execution condition stands. When it is judged that the first execution condition does not stand, the processing cycle ends. When it is judged that the first execution condition stands, the routine proceeds to thenext step 308 where it is judged if the second execution condition stands. When it is judged that the second execution condition stands, the routine proceeds to thenext step 309 where rich control for SOx release is executed. At the followingstep 310, it is judged if rich control for SOx release should be ended. When it is judged that rich control for SOx release should be ended, the processing cycle is ended. When it is judged that rich control should be ended, the routine proceeds to step 311 where the flag XS is reset (XS=0) and the SOx stored amount NOX is cleared (SOX=0). Next, the routine proceeds to step 306 where the flag XN is reset (XN=0) and the NOx stored amount NOX is cleared (NOX=0). This is because, when rich control for SOx release is executed, NOx is released from the NOx storage catalyst 14. - On the other hand, when it is judged at
step 303 or step 308 that the second execution condition does not stand, the routine proceeds to thenext step 312 where the target gear position GPT is calculated. At the followingstep 313, it is judged if the target gear position GPT could be calculated. When the target gear position GPT could not be calculated, the processing cycle is ended. When the target gear position GPT could be calculated, the routine proceeds to thenext step 314 where an indication that the gear position of thetransmission 25 should be changed to the target gear position GPT is displayed by theindicator 27. If changing the gear position to the target gear position GPT in accordance with the indication displayed on theindicator 27 by the vehicle operator, the first execution condition and the second execution condition stand. As a result, rich control for NOx release or SOx release is started. -
FIG. 16 shows a routine for executing control of theindicator 27. This routine is executed by interruption every certain time interval. - Referring to
FIG. 16 , instep 400, it is judged if an indication that the gear position of thetransmission 25 should be changed is being displayed by theindicator 27. When theindicator 27 does not display an indication, the processing cycle is ended. When theindicator 27 displays an indication, the routine proceeds to thenext step 401 where it is judged if the current gear position GP matches the target gear position GPT. When the current gear position GP does not match the target gear position GPT, the processing cycle is ended. When the current gear position GP matches the target gear position GPT, the routine proceeds to thenext step 402 where display of the indication by theindicator 27 is stopped. - Next, another embodiment according to the present invention will be explained.
- In another embodiment according to the present invention, the
indicator 27 displays not only an indication that the gear position of thetransmission 25 should be changed, but also an indication that the gear position should not be changed. That is, when displaying an indication that shift up should not be performed, as shown inFIG. 17(A) , the upward facing light 27a is for example lit up or flashed red and the downward facing light 27b is extinguished. On the other hand, when displaying an indication that a shift down should not be performed, as shown inFIG. 17(B) , the downward facing light 27b is, for example, lit up or flashed red and the upward facing light 27a is extinguished. When displaying an indication that neither a shift up or shift down should be performed, as shown inFIG. 17(C) , the upward facing light 27a and downward facing light 27b are for example lit up or flashed red. - Now then, if the gear position of the
transmission 25 is changed when rich control is being executed, the engine operating state is changed. In this case, the changed engine operating state is liable to be outside the rich control allowable area AA. That is, in the example which is shown inFIG. 18 , if a shift down is performed when the point Q which shows the engine operating state is in the rich control allowable area AA, the engine operating state is changed to the point QD. This point QD is outside the rich control allowable area AA. Therefore, the second execution condition does not stand. Even when the gear position is changed to outside the set gear position during rich control, the second execution condition does not stand. If the rich control execution conditions do not stand during rich control in this way, rich control ends up being interrupted. - Therefore, in another embodiment according to the present invention, it is judged if the rich control execution conditions would stand when assuming the gear position were changed under a constant engine output when rich control for NOx release or SOx release was executed. When it is judged that the rich control execution conditions would not stand, an indication that the gear position should not be changed is displayed by the
indicator 27 to the vehicle operator. As a result, if the vehicle operator does not change the gear position, the state where the rich control execution conditions stand is maintained and therefore rich control is continued. -
FIG. 19 shows the routine for execution of control of theindicator 27 in another embodiment according to the present invention. This routine is executed by interruption every certain time interval. - Referring to
FIG. 19 , atstep 500, it is judged if rich control is currently being executed. When rich control is not being executed, the processing cycle ends. When the rich control is being executed, the routine proceeds to thenext step 501 where the engine operating state EOCU when assuming shift up under a constant engine output is estimated. At the followingstep 502, whether the second execution condition would not stand when assuming a shift up were performed under a constant engine output is judged based on the engine operating state EOCU and gear position when assuming shift up were performed. When it is judged that the second execution condition would continue to stand even when a shift up was performed, the routine jumps to thenext step 504. When the second execution condition would not stand if a shift up were performed, the routine proceeds to thenext step 503 where an indication that a shift up should not be performed is displayed by theindicator 27. Next, the routine proceeds to step 504. - At
step 504, the engine operating state EOCD when assuming that a shift down is performed under a constant engine output is estimated. At the followingstep 505, it is judged if the second execution condition would not stand when assuming that a shift down were performed under a constant engine output based on the engine operating state EOCD and gear position when assuming a shift down has been performed. When it is judged that the second execution condition continues to stand even when a shift down is performed, the processing cycle is ended. When it is judged that the second execution condition would not stand if a shift down were performed, the routine proceeds to thenext step 506 where an indication that a shift down should not be performed is displayed by theindicator 27. -
- 1
- engine body
- 2
- combustion chamber
- 3
- fuel injector
- 13
- exhaust pipe
- 14
- NOx storage catalyst
- 25
- transmission
- 26
- shift lever
- 27
- indicator
Claims (7)
- An exhaust purification system for an internal combustion engine, the system arranging in an engine exhaust passage an NOx storage catalyst (14) which stores NOx in exhaust gas when the inflowing exhaust gas is lean in air-fuel ratio and which releases the stored NOx when the inflowing exhaust gas becomes rich in air-fuel ratio, the system comprising a rich control means for executing a rich control which temporarily switches the air-fuel ratio of the exhaust gas which flows into the NOx storage catalyst to be rich by injecting additional fuel into a combustion chamber (2) in a combustion stroke or exhaust stroke in order to release NOx or SOx from the NOx storage catalyst (14), the system judging if rich control execution conditions stand when rich control should be executed, based on the engine operating state, the system executing rich control when it is judged that the rich control execution conditions stand and prohibits rich control when it is judged that rich control execution conditions do not stand, characterized in that the system comprises a transmission (25) with a gear position which is changed by a vehicle operator and an indicator (27) which displays an indication relating to a change of the gear position of the transmission (25) to a vehicle operator, that when it is judged that the rich control execution conditions do not stand while rich control should be executed, a gear position, where the rich control execution conditions would stand when assuming that the gear position were changed under a constant engine output, is found, and that the indicator (27) is controlled to display to the vehicle operator an indication to change the gear position to the found gear position, whereby rich control is executed when the rich control execution conditions stand due to the change of the gear position to the found gear position by the vehicle operator.
- The exhaust purification system for an internal combustion engine according to claim 1 wherein it is judged that the rich control execution conditions stand when the engine operating state is in a rich control allowable area (AA) and it is judged that the rich control execution conditions do not stand when the engine operating state is outside the rich control allowable area.
- The exhaust purification system for an internal combustion engine according to claim 1 or 2 wherein the engine operating state is expressed by an engine load (TRQ) and an engine speed (N).
- The exhaust purification system for an internal combustion engine according to claim 2 or 3 wherein it is judged that the rich control execution conditions stand when the engine operating state is in the rich control allowable area (AA) and the gear position of the transmission (25) is in a predetermined set gear position range and it is judged that the rich control execution conditions do not stand when the engine operating state is outside the rich control allowable area (AA) or the gear position of the transmission is outside the set gear position range.
- The exhaust purification system for an internal combustion engine according to any one of claims 2 to 4 wherein it is judged that the rich control execution conditions stand when the engine operating state is in the rich control allowable area and the temperature of the NOx storage catalyst is in a predetermined set temperature range and it is judged that the rich control execution conditions do not stand when the engine operating state is outside the rich control allowable area or the temperature of the NOx storage catalyst is outside the set temperature range.
- The exhaust purification system for an internal combustion engine according to any one of claims 2 to 5 wherein it is judged that the rich control execution conditions stand when the engine operating state is in the rich control allowable area and the vehicle speed is in a predetermined set vehicle speed range and it is judged that the rich control execution conditions do not stand when the engine operating state is outside the rich control allowable area (AA) or the vehicle speed is outside the set vehicle speed range.
- The exhaust purification system for an internal combustion engine according to any one of claims 1 to 6 wherein it is judged if the rich control execution conditions would stand when assuming that the gear position were changed under a constant engine output when rich control is being executed and, when it is judged that the rich control execution conditions would not stand, the indicator (27) is controlled to display to the vehicle operator an indication that the gear position should not be changed.
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JP2013226391A JP5904191B2 (en) | 2013-10-31 | 2013-10-31 | Exhaust gas purification device for internal combustion engine |
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FR3119644A1 (en) * | 2021-02-08 | 2022-08-12 | Renault S.A.S. | METHOD FOR CONTROLLING A PURGE OF A NITROGEN OXIDE TRAP |
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JP2007154771A (en) | 2005-12-06 | 2007-06-21 | Mitsubishi Fuso Truck & Bus Corp | Exhaust emission control device |
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GB9019400D0 (en) * | 1990-09-05 | 1990-10-17 | Lucas Ind Plc | Power unit |
DE19852600A1 (en) * | 1998-11-14 | 2000-05-18 | Bosch Gmbh Robert | Method for operating an internal combustion engine, in particular a motor vehicle |
DE10001992A1 (en) * | 2000-01-19 | 2001-07-26 | Volkswagen Ag | Method to temporarily increase exhaust gas temperature of internal combustion engine; involves measuring state of electrical or other consumer to raise motor load and controlling fuel injection |
JP3900861B2 (en) * | 2001-06-13 | 2007-04-04 | 日産自動車株式会社 | Diesel engine control device |
JP2004245182A (en) * | 2003-02-17 | 2004-09-02 | Toyota Motor Corp | Emission control device for internal combustion engine |
SE0302269L (en) * | 2003-08-20 | 2005-02-21 | Volvo Lastvagnar Ab | Motor vehicle with exhaust gas cleaning |
DE10359674A1 (en) * | 2003-12-18 | 2005-07-28 | Siemens Ag | Method for increasing the exhaust gas temperature of internal combustion engines |
JP4489632B2 (en) * | 2005-04-26 | 2010-06-23 | 本田技研工業株式会社 | Transmission shift instruction method |
JP2007270646A (en) * | 2006-03-30 | 2007-10-18 | Mitsubishi Fuso Truck & Bus Corp | Exhaust emission control device of vehicular internal combustion engine |
JP2009540213A (en) * | 2006-06-14 | 2009-11-19 | ボルボ ラストバグナー アーベー | Method and apparatus for regenerating an exhaust gas purification device |
JP4613894B2 (en) * | 2006-08-02 | 2011-01-19 | 株式会社デンソー | Exhaust purification device for internal combustion engine |
-
2013
- 2013-10-31 JP JP2013226391A patent/JP5904191B2/en active Active
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JP2007154771A (en) | 2005-12-06 | 2007-06-21 | Mitsubishi Fuso Truck & Bus Corp | Exhaust emission control device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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FR3119644A1 (en) * | 2021-02-08 | 2022-08-12 | Renault S.A.S. | METHOD FOR CONTROLLING A PURGE OF A NITROGEN OXIDE TRAP |
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