CN101600861A - The Exhaust gas purifying device of internal-combustion engine - Google Patents
The Exhaust gas purifying device of internal-combustion engine Download PDFInfo
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- CN101600861A CN101600861A CNA2008800037494A CN200880003749A CN101600861A CN 101600861 A CN101600861 A CN 101600861A CN A2008800037494 A CNA2008800037494 A CN A2008800037494A CN 200880003749 A CN200880003749 A CN 200880003749A CN 101600861 A CN101600861 A CN 101600861A
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- water adsorption
- adsorption material
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 139
- 238000001179 sorption measurement Methods 0.000 claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 25
- 239000002912 waste gas Substances 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims description 6
- 230000000274 adsorptive effect Effects 0.000 abstract description 11
- 238000010521 absorption reaction Methods 0.000 description 41
- 230000009471 action Effects 0.000 description 34
- 230000000630 rising effect Effects 0.000 description 7
- 238000000746 purification Methods 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 5
- 230000008676 import Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010926 purge Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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Classifications
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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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
- F01N3/0878—Bypassing 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/22—Water or humidity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to a kind of Exhaust gas purifying device of internal-combustion engine, its purpose is, on exhaust passageway, begin to have the internal-combustion engine of water adsorption material and NOx sorbing material, avoid hindering the adsorptive power of NOx well, fully guarantee the NOx adsorptive power of NOx sorbing material because of moisture from upstream side.Wherein, has the main exhaust path (14) that this main exhaust path, flows from the waste gas of internal-combustion engine (10) discharge; Has the bypass path (20) of walking around main exhaust path (14); In bypass path (20), begin to have successively water adsorption material (24) and NOx sorbing material (28) from a side near upstream side joint (20a), begun moment of breaking away from from water adsorption material (24) being judged as moisture, control switching valve (22) is not so that waste gas flows into NOx sorbing material (28).
Description
Technical field
The present invention relates to a kind of Exhaust gas purifying device of internal-combustion engine, have the Exhaust gas purifying device of sorbing material in particular to a kind of downstream of the catalyzer in exhaust passageway, above-mentioned sorbing material is used to adsorb the not purification composition that can't purify by catalyzer.
Background technique
All the time, for example disclose following technology in patent documentation 1: the ventilation gas of discharging from roads and tunnels is carried out dry process with the sorbing material of zeolites, and absorption is removal NOx also, purifies this ventilation gas thus.In the prior art, in the upstream with respect to the ventilation gas stream of the above-mentioned sorbing material that is used for NOx adsorption, configuration is used for adsorbing the siccative (water adsorption material) of the silica type of the moisture that ventilation gas contains.
Patent documentation 1: Japanese kokai publication hei 1-155934 communique
Patent documentation 2: TOHKEMY 2002-138820 communique
Summary of the invention
In the exhaust passageway of internal-combustion engine, be provided with the catalyzer that is used for purifying exhaust air.But when the lower cold starting of the temperature of catalyzer, reach in catalyst warm-up activation during, the situation that exists the waste gas that contains NOx to discharge to the outside.In addition, contain the moisture that generates because of fuel combustion in the waste gas in a large number.Therefore, on the exhaust passageway of internal-combustion engine, the same with above-mentioned prior art, consideration will be used to adsorb the water adsorption material configuration of moisture of the NOx adsorptive power that hinders the NOx sorbing material at the upstream side of exhaust flow, at the downstream of this water adsorption material configuration NOx sorbing material.
As mentioned above, on exhaust passageway, have in the structure of water adsorption material and NOx sorbing material, if moisture is to the extent of adsorption of the water adsorption material state that reaches capacity, or the moisture of amount that surpasses the water adsorption ability of water adsorption material flows into this water adsorption material, and then the water adsorption material does not adsorb the NOx sorbing material that most moisture can flow into the downstream.When moisture flows into the NOx sorbing material, can seriously hinder the NOx adsorptive power of NOx sorbing material, the disengaging that easily produces the NOx that is adsorbed by the NOx sorbing material.
The present invention proposes in order to solve above-mentioned problem, its purpose is to provide a kind of Exhaust gas purifying device of internal-combustion engine, it begins to have the internal-combustion engine of water adsorption material and NOx sorbing material from upstream side on exhaust passageway, avoid hindering the adsorptive power of NOx well, fully guarantee the NOx adsorptive power of NOx sorbing material because of moisture.
The 1st invention is characterised in that to have:
The main exhaust path, the waste gas of discharging from internal-combustion engine flows this main exhaust path;
The bypass path, and is converging with above-mentioned main exhaust path than the downstream side joint of above-mentioned upstream side joint by the downstream from above-mentioned main exhaust forehearth limb once more at the upstream side joint that is connected with above-mentioned main exhaust path;
The stream switching unit can make the inflow destination of waste gas switch between above-mentioned main exhaust path and above-mentioned bypass path;
The water adsorption material is configured in the above-mentioned bypass path, has the function of hygroscopic moisture;
The NOx sorbing material, the above-mentioned water adsorption material when making above-mentioned water adsorption material hygroscopic moisture is compared, and is configured in the above-mentioned bypass path in downstream side of exhaust flow, has the function of NOx adsorption;
Moisture breaks away from judging unit, judges whether moisture has begun to break away from from above-mentioned water adsorption material; And
The stream control unit being judged as under the situation that moisture begun to break away from, is controlled above-mentioned stream switching unit so that waste gas does not flow into above-mentioned NOx sorbing material.
In addition, the 2nd invention is characterised in that in the 1st invention, above-mentioned moisture breaks away from judging unit and judges according to the temperature of above-mentioned water adsorption material whether moisture has begun to break away from.
According to the 1st invention, begun moment of breaking away from from the water adsorption material being judged as moisture, finish NOx absorption action to the NOx sorbing material, therefore can suppress the disengaging of the NOx that moisture causes.
According to the 2nd invention, not based on the temperature of NOx sorbing material, and infer the inflow of moisture to the NOx sorbing material based on the temperature of configuration water adsorption material at its upstream, thus, can more promptly carry out the switching judging of stream switching unit, can before NOx breaks away from from the NOx sorbing material, finish absorption reliably.
Description of drawings
Fig. 1 is the figure of structure that is used for illustrating the internal-combustion engine system of the Exhaust gas purifying device with embodiments of the present invention 1.
Fig. 2 is the figure that is used to illustrate the system acting of embodiments of the present invention 1.
Fig. 3 is a time diagram in the expression embodiments of the present invention 1, the control form when making NOx absorption release.
Fig. 4 is the flow chart of the program of execution in embodiments of the present invention 1.
Fig. 5 is a time diagram in the expression embodiments of the present invention 2, the control form when making NOx absorption release.
Fig. 6 is the flow chart of the program of execution in embodiments of the present invention 2.
Label declaration
10 internal-combustion engines
12 air suction ways
14 main exhaust paths
16 leading portion catalyzer
18 back segment catalyzer
20 bypass paths
20a upstream side joint
20b downstream side joint
22 switching valves
24 water adsorption materials
28 NOx sorbing materials
30 return paths
32 PCV Purge Control Valves
40 ECU (Electronic Control Unit: electronic control unit)
Embodiment
Mode of execution 1
[explanation of system construction]
Fig. 1 is the figure of structure that is used for illustrating the internal-combustion engine system of the Exhaust gas purifying device with embodiments of the present invention 1.Internal-combustion engine 10 shown in Figure 1 has and is used for air is taken into air suction way 12 in the tube, and the exhaust passageway of the exhaust flow warp of discharging in the tube.
The exhaust passageway of present embodiment has the main exhaust path 14 that is used for combustion gas in the tube, and following bypass path 20.In the main exhaust path 14, but begin leading portion catalyzer (SC) 16, and the back segment catalyzer (UF) 18 of arranged in series purifying exhaust air successively from upstream side.
In the system of present embodiment, have as the bypass path 20 of walking around the path of main exhaust path 14.Bypass path 20 constitutes, and, converges with main exhaust path 14 once more at the joint 20b place, downstream side in the downstream that is positioned at this upstream side joint 20a from main exhaust path 14 branches at the upstream side joint 20a place in the downstream that is positioned at back segment catalyzer 18.In upstream side joint 20a, configuration switching valve 22 is used for the inflow destination of waste gas is switched between main exhaust path 14 and bypass path 20.Switching valve 22 is controlled driven for opening and closing by coming the motor intake negative-pressure of control action in negative pressure barrier film 22a by having omitted illustrated solenoid valve.In addition, when the usual running of internal-combustion engine 10, control switching valve 22 makes waste gas directly not be discharged in the atmosphere through main exhaust path 14 via bypass path 20 to cut out bypass path 20 thus.
In addition, 2 sorbing materials of configuration in the way of bypass path.Particularly, at the upstream side of main exhaust path 14, promptly near the side of upstream side joint 20a, configuration has the water adsorption material 24 of the function of the moisture that contains in the absorption waste gas.As this water adsorption material 24, for example can use zeolitic materials.Group goes into to be used to detect the temperature transducer 26 of the temperature of this water adsorption material 24 in the water adsorption material 24.
In addition, in the bypass path 20, in the downstream side of water adsorption material 24, promptly away from the side of upstream side joint 20a, configuration has the NOx sorbing material 28 that composition is the function of NOx that do not purify that contains in the absorption waste gas.As this NOx sorbing material 28, for example can use the material that on zeolite, has carried iron Fe.
In addition, in the bypass path 20, on the position between upstream side joint 20a and the water adsorption material 24, be communicated with return path 30.Return path 30 has PCV Purge Control Valve 32 in its way, be communicated with air suction way 12 on its end.In addition, the linking objective of return path 30 for example also can be the upstream portion of the leading portion catalyzer 16 in the main exhaust path 14 if the path of the upstream of back segment catalyzer 18 then also can not be an air suction way 12.
The system of present embodiment has ECU (Electronic Control Unit: electronic control unit) 40.Connect various sensors, the above-mentioned humidity transducer 26 that is used for controlling combustion engine 10 among the ECU40, and connect the cooling-water temperature sensor 42 that is used for the detection of engine cooling water temperature.In addition, the various actuators that connect above-mentioned switching valve 22, PCV Purge Control Valve 32 among the ECU40.
[action of mode of execution 1]
Fig. 2 is the figure that is used to illustrate the system acting of embodiments of the present invention 1.
(action during absorption)
At first, with reference to Fig. 2 (A) action of carrying out in order to make NOx the waste gas that above-mentioned sorbing material 24,28 absorption discharge and moisture in cylinder is described when internal-combustion engine 10 cold startings.
The absorption action when internal-combustion engine 10 cold startings, forms switching valve 22 and makes main exhaust path 14 closing state and begin action shown in Fig. 2 (A).In addition, when carrying out this absorption action, PCV Purge Control Valve 32 also is controlled to be closed condition.
Under above-mentioned state, the waste gas of discharging from internal-combustion engine 10 all imports bypass path 20 from main exhaust path 14.The waste gas that imports bypass path 20 is successively by water adsorption material 24 and NOx sorbing material 28, turn back to main exhaust path 14 once more afterwards after, be discharged in the atmosphere.
Make waste gas import NOx sorbing material 28 if exceed the adsorptive power of NOx sorbing material 28, in a single day the NOx that then is adsorbed onto NOx sorbing material 28 breaks away from, can cause exhaust emission deteriorates.Therefore, need finish NOx absorption and move at the appropriate time before NOx begins to break away from from NOx sorbing material 28.This setting of time that finishes NOx absorption action is as the characteristic of present embodiment, with reference to Fig. 3 in following explanation.In addition, under the situation of the time arrival that finishes this absorption action, control switching valve 22 is so that bypass path 20 becomes closed condition.
According to above-mentioned absorption action, the moisture that contains in the waste gas is adsorbed by water adsorption material 24, thereby is removed.And the NOx that contains in the waste gas is adsorbed by NOx sorbing material 28, thereby is removed.Thus, when leading portion catalyzer 16 non-activated cold starting still, can suppress NOx and be discharged in the atmosphere.
(action during purification)
Fig. 2 (B) is the figure that is used to illustrate the purification action of present embodiment.Shown in Fig. 2 (B), in the present embodiment, carry out being back to the purification action that the method for air suction way is carried out via return path 30 by making by the NOx of NOx sorbing material 28 absorption.
Purify action and be control switching valve 22 with the state of closing bypass path 20 under, be in the moment that purification elapsed time of the medium regulation of activation arrives at leading portion catalyzer 16, shown in Fig. 2 (B), begin by opening PCV Purge Control Valve 32.Purify action according to this, the negative pressure that the part utilization of the waste gas of discharging in tube produces the air suction way 12 of internal-combustion engine 10 by downstream side joint 20b, imports bypass path 20 from main exhaust path 14.
As a result, the waste gas that becomes warmer after the starting is fed into sorbing material 28 etc., and NOx breaks away from from NOx sorbing material 28 thus, is discharged to air suction way 12 via return path 30.After the NOx that turns back to air suction way 12 burns once more, be in catalyzer 16 purifications such as grade of activated state.
[characteristic of mode of execution 1]
As shown in Figure 1, in the present embodiment, the upstream side configuration water adsorption material 24 of the NOx sorbing material 28 when the absorption action.Therefore, in the upstream of NOx sorbing material 28, moisture is removed by water adsorption material 24 in advance, thus the waste gas of drying can be imported NOx sorbing material 28, can be than the NOx adsorption performance of high maintenance NOx sorbing material 28.
But, when adsorbing action, if moisture is to the extent of adsorption of water adsorption material 24 state that reaches capacity, or the moisture of amount that surpasses the water adsorption ability of water adsorption material 24 flows into this water adsorption material 24, and then water adsorption material 24 does not adsorb the NOx sorbing material 28 that most moisture flows into the downstream.If moisture flows into NOx sorbing material 28, situation about being broken away from by the NOx of NOx sorbing material 28 absorption takes place in the NOx adsorptive power that then can hinder NOx sorbing material 28 greatly easily.
Therefore, in the present embodiment, begun moment of breaking away from from water adsorption material 24 being judged as moisture,, closed the inlet of bypass path 20, made NOx absorption release by control switching valve 22 in the configuration of the upstream of NOx sorbing material 28.More particularly, in the present embodiment, adsorbing when action,, judging that moisture is from moment that water adsorption material 24 begins to break away from by judging by the temperature of said temperature sensor 26 detected water adsorption materials 24 whether more than specified value.
Fig. 3 is a time diagram in the expression embodiments of the present invention 1, the control form when making NOx absorption release.As shown in Figure 3, contain the waste gas of moisture and moisture during by 24 absorption of water adsorption material by importing, the heat of adsorption of moisture causes the temperature of water adsorption material 24 to rise.But if a certain amount of above water adsorption then can't be adsorbed the moisture above this degree in water adsorption material 24, moisture can flow into NOx sorbing material 28.
The specified value T1 of water adsorption material 24 shown in Figure 3 is used to judge that moisture begins a certain amount of moisture of the degree that breaks away from from water adsorption material 24 by the value in the moment of water adsorption material 24 absorption.In the present embodiment, reach the moment of this specified value T1 in the temperature of water adsorption material 24, switch position to switching valve 22, becomes the state (state of " not the having absorption " shown in Fig. 3) of closing bypass path 20 with the state (state of " absorption is arranged " shown in Fig. 3) from open bypass path 20.
Fig. 4 is in order to realize the absorption action in the present embodiment and to purify action and the flow chart of the program carried out by ECU40.In addition, program shown in Figure 4 is just started after internal-combustion engine 10 starting just.
In program shown in Figure 4, at first, judge that engine cooling water temperature is whether below setting temperature (step 100).Its result is higher than under the situation of setting temperature being judged as engine cooling water temperature, i.e. under the situation that preheating finishes, finish this processing cycle rapidly.
In above-mentioned steps 100, be judged as engine cooling water temperature under the situation below the setting temperature, under the situation when promptly thinking cold starting, open switching valve 22, and close PCV Purge Control Valve 32 (step 102).Switching valve 22 stops up the inlet of bypass path 20 under normal conditions, but in this step 102, under the situation when thinking cold starting, switches so that main exhaust path 14 and bypass path 20 become connected state.Thus, begin the absorption action.
Then, whether the temperature of judging water adsorption material 24 reaches specified value T1 (step 104).Here directly measure the temperature of water adsorption material 24 by temperature transducer 26, but alternative this method, also can adopt the method for temperature of inferring water adsorption material 24 according to the exhaust gas temperature of the front and back of water adsorption material 24.
In above-mentioned steps 104, reached in the temperature that is judged as water adsorption material 24 under the situation of specified value T1, promptly be judged as and be under the situation that moisture begins the situation that breaks away from from water adsorption material 24, switching valve 22 cuts out so that bypass path 20 stops up (step 106).Finish NOx absorption action thus.
Then, judge to purify the action elapsed time whether arrived (step 108).More specifically, in this step 108, judge based on following situation: whether catalyzer 16 grades are in activated state; Whether the temperature that imports the waste gas of bypass path 20 is in and is suitable for purifying in the temperature range of action; Even and whether internal-combustion engine 10 is in and purifies the stable operating condition that action does not also go wrong.
In above-mentioned steps 108, purify under the situation that the action elapsed time arrived being judged as, PCV Purge Control Valve 32 is opened (step 110).Then, carry out purge amount and judge (step 112).Judge promptly particularly whether present purge amount has reached the set amount of regulation.The transit time after present purge amount can be opened based on the PCV Purge Control Valve in the above-mentioned steps 110 32 and the relation of Purge gas temperature are inferred.
In above-mentioned steps 112, reached under the situation of set amount being judged as purge amount, PCV Purge Control Valve 32 is closed (step 114).Finish to purify action thus.
Program shown in Figure 4 according to above explanation, reached the moment (promptly basis is from the result of the adsorptive power of the temperature estimation NOx sorbing material 28 of water adsorption material 24) of specified value T1 in the temperature of water adsorption material 24, switching valve 22 is switched, can begin to make NOx absorption release at moisture thus from the moment that water adsorption material 24 breaks away from.According to this control, can before being about to flow into NOx sorbing material 28, moisture promptly be made before NOx absorption release because of moisture breaks away from by the NOx of NOx sorbing material 28 absorption.Therefore, can maximally utilise the NOx adsorptive power of NOx sorbing material 28.
In addition, according to said procedure, not based on the temperature of NOx sorbing material 28, and infer the inflow situation of moisture to NOx sorbing material 28 based on the temperature of configuration water adsorption material 24 at its upstream, can more promptly carry out the switching judging of switching valve 22 thus, can before NOx sorbing material 28 breaks away from, finish absorption reliably at NOx.
In addition, in above-mentioned mode of execution 1, switching valve 22, return path 30 and PCV Purge Control Valve 32 are equivalent to " the stream switching unit " in above-mentioned the 1st invention.In addition, ECU40 respectively by the processing of carrying out above-mentioned steps 104 realize above-mentioned the 1st the invention in " moisture disengaging judging unit ", by the processing of carrying out above-mentioned steps 106 realize above-mentioned the 1st the invention in " stream control unit ".
Mode of execution 2
Then, with reference to Fig. 5 and Fig. 6 embodiments of the present invention 2 are described.
The system of present embodiment can be by using hardware construction shown in Figure 1, and substitute in ECU40 and carry out program shown in Figure 4 and carry out following program shown in Figure 6 and realize.
[characteristic of mode of execution 2]
Fig. 5 is a time diagram in the expression embodiments of the present invention 2, the control form when making NOx absorption release.
In above-mentioned mode of execution 1, whether the temperature of the water adsorption material 24 when adsorbing action by judgement has reached specified value T1, judges that moisture begins the moment that breaks away from from water adsorption material 24.Relative with it, in the present embodiment, whether the temperature rising degree of the water adsorption material 24 when adsorbing action by judgement is lower than specified value X1, judges that moisture begins the moment that breaks away from from water adsorption material 24.
As mentioned above, when moisture was adsorbed by water adsorption material 24, the heat of adsorption of moisture caused the temperature of water adsorption material 24 to rise.On the other hand, when the moisture that has adsorbed breaks away from from water adsorption material 24, the temperature of water adsorption material is descended because of breaking away from heat.Therefore, by moisturizing to the influx of water adsorption material 24, compare the disengaging quantitative change with extent of adsorption for a long time, the temperature rising degree of water adsorption material 24 descends.
The specified value X1 of the temperature rising degree of water adsorption material 24 shown in Figure 5 is to be used to judge that moisture begins a certain amount of moisture of the degree that breaks away from from water adsorption material 24 by the value in the moment of water adsorption material 24 absorption.In the present embodiment, in the temperature rising degree of water adsorption material 24 the moment less than this specified value X1, switch position to switching valve 22, becomes the state (state of " not the having absorption " shown in Fig. 5) that stops up bypass path 20 with the state (state of " absorption is arranged " shown in Fig. 5) from open bypass path 20.
Fig. 6 is in order to realize the absorption action in the present embodiment and to purify action and the flow chart of the program carried out by ECU40.In addition, program shown in Figure 6 is just started after internal-combustion engine 10 starting just.In addition, in Fig. 6, to mode of execution 1 in the identical step of step shown in Figure 4, add identical mark, and omit or simplify its explanation.
In program shown in Figure 6, after internal-combustion engine 10 cold startings, by after opening switching valve 22 (step 102) and beginning absorption action, whether the temperature rising degree of then judging water adsorption material 24 is less than specified value X1 (step 200).
As a result, be judged as under the situation of temperature rising degree less than specified value X1 of water adsorption material 24, promptly be judged as and be under the situation that moisture begins the situation that breaks away from from water adsorption material 24, switching valve 22 cuts out to stop up bypass path 20 (steps 106).Finish NOx absorption action thus.
In program shown in Figure 6, a series of processing of execution in step 108～114 afterwards, but these processing are identical with above-mentioned program shown in Figure 4, therefore omit its detailed explanation here.
According to the program shown in Figure 6 of above explanation, in the temperature rising degree of water adsorption material 24 the moment, switching valve 22 is switched, thereby can begin to make NOx absorption release at moisture from the moment that water adsorption material 24 breaks away from less than specified value X1.According to this control, can before being about to flow into NOx sorbing material 28, moisture promptly be made before NOx absorption release because of moisture breaks away from by the NOx of NOx sorbing material 28 absorption.Therefore, can maximally utilise the NOx adsorptive power of NOx sorbing material 28.
Claims (2)
1. the Exhaust gas purifying device of an internal-combustion engine is characterized in that, has:
The main exhaust path, the waste gas of discharging from internal-combustion engine flows this main exhaust path;
The bypass path, and is converging with above-mentioned main exhaust path than the downstream side joint of above-mentioned upstream side joint by the downstream from above-mentioned main exhaust forehearth limb once more at the upstream side joint that is connected with above-mentioned main exhaust path;
The stream switching unit can make the inflow destination of waste gas switch between above-mentioned main exhaust path and above-mentioned bypass path;
The water adsorption material is configured in the above-mentioned bypass path, has the function of hygroscopic moisture;
The NOx sorbing material, the above-mentioned water adsorption material when making above-mentioned water adsorption material hygroscopic moisture is compared, and is configured in the above-mentioned bypass path in downstream side of exhaust flow, has the function of NOx adsorption;
Moisture breaks away from judging unit, judges whether moisture has begun to break away from from above-mentioned water adsorption material; With
The stream control unit being judged as under the situation that moisture begun to break away from, is controlled above-mentioned stream switching unit so that waste gas does not flow into above-mentioned NOx sorbing material.
2. the Exhaust gas purifying device of internal-combustion engine according to claim 1 is characterized in that, above-mentioned moisture breaks away from judging unit and judges according to the temperature of above-mentioned water adsorption material whether moisture has begun to break away from.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007023443A JP2008190364A (en) | 2007-02-01 | 2007-02-01 | Exhaust emission control device for internal combustion engine |
| JP023443/2007 | 2007-02-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101600861A true CN101600861A (en) | 2009-12-09 |
Family
ID=39674040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008800037494A Pending CN101600861A (en) | 2007-02-01 | 2008-01-30 | The Exhaust gas purifying device of internal-combustion engine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20100043410A1 (en) |
| JP (1) | JP2008190364A (en) |
| CN (1) | CN101600861A (en) |
| DE (1) | DE112008000297T5 (en) |
| WO (1) | WO2008093732A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281736A (en) * | 2018-09-28 | 2019-01-29 | 潍柴动力股份有限公司 | Passive oxynitrides absorption PNA system, after-treatment system and control method |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8978360B2 (en) * | 2009-09-15 | 2015-03-17 | Ford Global Technologies, Llc | Hydrocarbon and NOx trap |
| DE102012022941B4 (en) * | 2012-11-24 | 2024-05-29 | Daimler Truck AG | Exhaust aftertreatment system for an internal combustion engine, method for operating an exhaust aftertreatment system and motor vehicle |
| DE102013018920A1 (en) * | 2013-11-13 | 2015-05-13 | Man Truck & Bus Ag | An exhaust aftertreatment device for an internal combustion engine and method for heating an exhaust aftertreatment device |
| JP2017512279A (en) * | 2014-02-27 | 2017-05-18 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニーＪｏｈｎｓｏｎ Ｍａｔｔｈｅｙ Ｐｕｂｌｉｃ Ｌｉｍｉｔｅｄ Ｃｏｍｐａｎｙ | Exhaust system with N2O catalyst in exhaust gas recirculation circuit |
| DE102020117418A1 (en) | 2020-07-02 | 2022-01-05 | Volkswagen Aktiengesellschaft | Process for exhaust gas aftertreatment of an internal combustion engine as well as internal combustion engine with exhaust gas aftertreatment system |
| US20240044274A1 (en) * | 2020-12-17 | 2024-02-08 | Brp-Rotax Gmbh & Co. Kg | Engine assembly for a vehicle having a hydrocarbon trap |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0616814B2 (en) | 1987-12-10 | 1994-03-09 | 国立公害研究所長 | Ventilation gas purification method in road tunnel |
| JP3083599B2 (en) * | 1991-09-30 | 2000-09-04 | 株式会社日立製作所 | Exhaust gas purification system |
| KR960004832B1 (en) * | 1992-08-24 | 1996-04-16 | 미쯔비시지도오샤고오교오 가부시기가이샤 | Engine exhaust gas purification apparatus |
| JP3311051B2 (en) * | 1992-12-16 | 2002-08-05 | 日本碍子株式会社 | Exhaust gas purification method and apparatus |
| JPH06272542A (en) * | 1993-03-17 | 1994-09-27 | Hitachi Ltd | Apparatus and method for controlling exhaust emission of internal combustion engine |
| JPH0742542A (en) * | 1993-07-27 | 1995-02-10 | Honda Motor Co Ltd | Exhaust emission control device foe intrenal combustion engine |
| US5375414A (en) * | 1993-10-04 | 1994-12-27 | Ford Motor Company | Automotive engine exhaust aftertreatment system including hydrocarbon adsorber with internal engine purge flow control |
| DE4400202C1 (en) * | 1994-01-05 | 1995-04-06 | Daimler Benz Ag | Method for the reduction of hydrocarbon emissions from an internal combustion engine |
| JPH08109824A (en) * | 1994-10-12 | 1996-04-30 | Nippon Soken Inc | Adsorption device for unburned hydrocarbon for internal combustion engine |
| JPH10176524A (en) * | 1996-12-16 | 1998-06-30 | Nissan Motor Co Ltd | Exhaust emission control device for engine |
| JP4262881B2 (en) | 2000-11-06 | 2009-05-13 | 本田技研工業株式会社 | Exhaust passage switching valve control device |
| JP2005155359A (en) * | 2003-11-21 | 2005-06-16 | Toyota Motor Corp | Exhaust emission control device for internal combustion engine |
| JP2006342700A (en) * | 2005-06-08 | 2006-12-21 | Toyota Motor Corp | Exhaust emission control device for internal combustion engine |
-
2007
- 2007-02-01 JP JP2007023443A patent/JP2008190364A/en active Pending
-
2008
- 2008-01-30 WO PCT/JP2008/051407 patent/WO2008093732A1/en active Application Filing
- 2008-01-30 DE DE112008000297T patent/DE112008000297T5/en not_active Withdrawn
- 2008-01-30 US US12/525,092 patent/US20100043410A1/en not_active Abandoned
- 2008-01-30 CN CNA2008800037494A patent/CN101600861A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281736A (en) * | 2018-09-28 | 2019-01-29 | 潍柴动力股份有限公司 | Passive oxynitrides absorption PNA system, after-treatment system and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008190364A (en) | 2008-08-21 |
| DE112008000297T5 (en) | 2009-11-19 |
| WO2008093732A1 (en) | 2008-08-07 |
| US20100043410A1 (en) | 2010-02-25 |
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Application publication date: 20091209 |