US20080120966A1 - Exhaust Gas Purification System for Internal Combustion Engine - Google Patents
Exhaust Gas Purification System for Internal Combustion Engine Download PDFInfo
- Publication number
- US20080120966A1 US20080120966A1 US11/795,338 US79533806A US2008120966A1 US 20080120966 A1 US20080120966 A1 US 20080120966A1 US 79533806 A US79533806 A US 79533806A US 2008120966 A1 US2008120966 A1 US 2008120966A1
- Authority
- US
- United States
- Prior art keywords
- exhaust gas
- exhaust
- combustion engine
- internal combustion
- temperature increasing
- 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.)
- Abandoned
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 93
- 238000000746 purification Methods 0.000 title 1
- 239000003054 catalyst Substances 0.000 claims abstract description 185
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 51
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 14
- 230000007423 decrease Effects 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 323
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 114
- 230000003647 oxidation Effects 0.000 description 72
- 238000007254 oxidation reaction Methods 0.000 description 72
- 239000000446 fuel Substances 0.000 description 49
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 14
- 230000004913 activation Effects 0.000 description 13
- 230000001172 regenerating effect Effects 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 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
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 230000014616 translation Effects 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
-
- 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
- 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
- F01N13/011—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 purifying devices arranged in parallel
-
- 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
- F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/204—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using an exhaust gas igniter, e.g. a spark or glow plug, without introducing fuel into exhaust duct
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
-
- 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
- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F01N2410/02—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of high temperature, e.g. overheating of catalytic reactor
-
- 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
- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F01N2410/04—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device during regeneration period, e.g. of particle filter
-
- 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
- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F01N2410/06—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device at cold starting
-
- 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
- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F01N2410/12—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of absorption, adsorption or desorption of exhaust gas constituents
-
- 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
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
-
- 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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an exhaust gas purifying system of an internal combustion engine.
- An exhaust gas from an internal combustion engine contains harmful substances such as NOx (nitrogen oxide).
- NOx nitrogen oxide
- a NOx catalyst for purifying the exhaust gas of NOx is provided in an exhaust system of the internal combustion engine in order to decrease emissions of these harmful substances.
- a temperature of the NOx catalyst is low, there might be a case that a NOx purifying efficiency decreases. Accordingly, the temperature of the NOx catalyst needs increasing up to a temperature at which the exhaust gas can be sufficiently purified of NOx.
- the exhaust gas from the internal combustion engine contains particulate matters (PM) of which a main component is carbon.
- PM particulate matters
- a known technology for preventing the emissions of these particulate matters into the atmospheric air involves providing an exhaust system of the internal combustion engine with a particulate filter (which will hereinafter simply be termed a [filter]) for trapping (scavenging) the particulate matters.
- the filter temperature needs increasing up to the temperature at which the particulate matters trapped by the filter can be sufficiently removed by oxidation.
- An exhaust passageway of the internal combustion engine is formed of a single exhaust pipe on an upstream side of the exhaust gas purifying device, and a portion configuring a passageway through which the exhaust gas passes and a portion provided with a catalyst heating up the exhaust gas by emitting heat upon being supplied with a reducing agent, are provided in parallel with each other in the exhaust pipe. Then, in the exhaust gas flowing through the exhaust pipe, allocation of a quantity of the exhaust gas passing through the catalyst heating up the exhaust gas and a quantity of the exhaust gas passing through the passageway, is set changeable.
- an exhaust gas purifying system of an internal combustion engine comprising:
- an exhaust gas purifying device provided in an exhaust passageway of the internal combustion engine, purifying an exhaust gas passing through the exhaust passageway and heated up to a predetermined temperature or higher with the result that purifying capability thereof is improved;
- exhaust gas temperature increasing unit provided on an upstream side of the exhaust gas purifying device in the exhaust passageway
- reducing agent adding unit provided on the upstream side of the exhaust gas temperature increasing unit in the exhaust passageway and adding a reducing agent to the exhaust gas passing through the exhaust passageway
- an exhaust gas temperature increasing catalyst provided in a single exhaust pipe configuring the exhaust passageway so that an exhaust gas flow-through area trough which the exhaust gas should pass is left, supplied with the reducing agent added from the reducing agent adding unit and thereby emitting heat;
- an exhaust gas flowrate control device controlling, in the exhaust gas passing though the exhaust pipe, allocation of a quantity of the exhaust gas passing the exhaust gas flow-through area and a quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- the NOx catalyst in the case of purifying the exhaust gas of the NOx by the NOx catalyst provided in the exhaust system of the internal combustion engine, the NOx catalyst needs to have a temperature equal to or higher than an activation temperature at which the NOx can be occluded. Further, in the case of executing the PM regenerating process on the filter provided in the exhaust system, it is required that a temperature of the filter be kept equal to or higher than a temperature at which the particulate matters trapped by the filter can be removed by oxidation.
- the exhaust gas not passing through the exhaust gas temperature increasing catalyst is to flow directly into the NOx catalyst or the filter.
- a bypath via which the exhaust gas bypasses the exhaust gas temperature increasing catalyst is provided separately from the exhaust pipe.
- the exhaust passageway comes to have a complicated structure, and there was a possibility that mountability on a vehicle declines or it becomes difficult to reduce costs.
- the exhaust gas temperature increasing unit is provided on the upstream side of the exhaust gas purifying device in the exhaust passageway. Then, in the exhaust gas temperature increasing unit, the exhaust gas temperature increasing catalyst is provided in the single exhaust pipe configuring the exhaust passageway so as to occupy part of the section of the exhaust pipe, and a remaining area of the section of the exhaust pipe is set as the exhaust gas flow-through area through which the exhaust gas passes. Then, the exhaust gas flow rate control device can control, in the exhaust gas flowing through the exhaust pipe, the allocation of the quantity of the exhaust gas passing through the exhaust gas flow-through area and the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- the exhaust gas temperature increasing catalyst and the exhaust gas flow-through area can be formed in parallel with each other in an interior of the single exhaust pipe configuring the exhaust passageway, and hence a contact area between the exhaust gas temperature increasing catalyst and the external portion of the exhaust passageway can be decreased to the greatest possible degree. Further, when the exhaust gas passes through the exhaust gas flow-through area, the heat of the exhaust gas can be efficiently transferred to the exhaust gas temperature increasing catalyst. As a result thereof, the heat retaining property of the exhaust gas temperature increasing catalyst can be improved.
- both of the exhaust gas temperature increasing catalyst and the exhaust gas flow-through area through which the exhaust gas passes can be provided in the single exhaust pipe, and the structure can be thus simplified, whereby the mountability of the exhaust gas purifying system on the vehicle can be improved, and the cost reduction can be also attained.
- the exhaust gas flow-through area may be disposed in a central portion in section perpendicular to an exhaust gas pass-through direction in the exhaust pipe, and the exhaust gas temperature increasing catalyst may be disposed outwardly of the exhaust gas flow-through area within the section.
- the temperature of the exhaust gas purifying device tends to be high at its central portion and becomes lower as it gets closer to a peripheral portion thereof. This is attributed to an escape of the heat into the outside air from the outer peripheral portion of the exhaust gas purifying device.
- the exhaust gas flow-through area through which the exhaust gas passes is disposed at the central portion in the section perpendicular to an exhaust gas pass-through direction in the exhaust pipe, and the exhaust gas temperature increasing catalyst is disposed outside of the exhaust gas flow-through area within the section.
- the exhaust gas temperature increasing catalyst can be distributed over the outer peripheral portion in the section perpendicular to the exhaust gas pass-through direction in the exhaust pipe. This contrivance being thus made, the exhaust gas heated up by the exhaust gas temperature increasing catalyst can be supplied concentratedly to the outer peripheral portion of the exhaust gas purifying device, and, even when the heat escapes into the outside air from the outer peripheral portion of the exhaust gas purifying device, the temperature of the exhaust gas purifying device can be increased uniformly.
- the exhaust gas flow rate control device may be set capable of selecting, by controlling the allocation, a state where substantially an entire quantity of the exhaust gas flowing through the exhaust pipe passes through the exhaust gas flow-through area, a state where substantially the entire quantity of the exhaust gas flowing through the exhaust pipe passes through the exhaust gas temperature increasing catalyst, and a state where substantially the entire quantity of the exhaust gas flowing through the exhaust pipe passes through both of the exhaust gas flow-through area and the exhaust gas temperature increasing catalyst.
- the exhaust gas flow rate control device selects the state where substantially the entire quantity of the exhaust gas flowing through the exhaust pipe passes through the exhaust gas temperature increasing catalyst, and the reducing agent adding unit adds the reducing agent to the exhaust gas, whereby the exhaust gas temperature increasing catalyst is supplied with the entire quantity of the exhaust gas and can get the reducing reaction caused by the reducing agent. This enables an inflow of only the high-temperature exhaust gas into the exhaust gas purifying device.
- the exhaust gas flow rate control device selects the state where substantially the entire quantity of the exhaust gas flowing through the exhaust pipe passes through the exhaust gas flow-through area, whereby the exhaust gas can be flowed directly into the exhaust gas purifying device without passing through the exhaust gas temperature increasing catalyst.
- the high-temperature exhaust gas can be restrained from further flowing into the exhaust gas temperature increasing catalyst. This makes it possible to restrain the exhaust gas temperature increasing catalyst from becoming the excessively high temperature.
- the temperature of the exhaust gas discharged from the internal combustion engine is low such as when in the low-load operation, the low-temperature exhaust gas can be restrained from flowing into the exhaust gas temperature increasing catalyst. This makes it feasible to restrain the decrease in temperature of the exhaust gas temperature increasing catalyst.
- the exhaust gas flow rate control device selects the state where the exhaust gas flowing through the exhaust pipe passes through both of the exhaust gas flow-through area and the exhaust gas temperature increasing catalyst, whereby the exhaust gas heated up as it passes through the exhaust gas temperature increasing catalyst and the exhaust gas not passing through the exhaust gas temperature increasing catalyst can be flowed in a properly mixed state thereof into the exhaust gas purifying device. This enables improvement of controllability of the temperature of the exhaust gas purifying device.
- the reducing agent adding unit may add the reducing agent to the exhaust gas passing through the exhaust passageway, and the exhaust gas flow rate control device may control the allocation in order to make substantially the entire quantity of the exhaust gas flowing through the exhaust pipe pass through the exhaust gas temperature increasing catalyst, and
- the exhaust gas flow rate control device may, after the reducing agent added from the reducing agent adding unit has reached the exhaust gas temperature increasing catalyst, control the allocation in order to decrease, in the exhaust gas flowing through the exhaust pipe, the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- the reducing agent adding unit adds the reducing agent to the exhaust gas flowing through the exhaust passageway, and the exhaust gas flow rate control device controls the allocation in order for the exhaust gas temperature increasing catalyst to admit the passage of substantially the entire quantity of the exhaust gas flowing trough the exhaust pipe. Under this control, the reducing agent added from the reducing agent adding unit can be efficiently led to the exhaust gas temperature increasing catalyst.
- the exhaust gas flow rate control device controls, in the exhaust gas flowing through the exhaust pipe, the allocation in order to decrease the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- the allocation being thus controlled, after the reducing agent has reached the exhaust gas temperature increasing catalyst, the flow rate of the exhaust gas passing though the exhaust gas temperature increasing catalyst decreases, and therefore the reducing agent can be restrained from passing intact through the exhaust gas temperature increasing catalyst. Then, the reducing agent can be stayed for a sufficiently long period of time in the exhaust gas temperature increasing catalyst. As a result, the sufficient reducing reaction can be caused in the exhaust gas temperature increasing catalyst, and the temperature of the exhaust gas discharged from the exhaust gas temperature increasing catalyst can be increased more surely.
- the exhaust gas flow rate control device may, during a decelerating operation of a vehicle mounted with the internal combustion engine, control the allocation in order to decrease, in the exhaust gas flowing through the exhaust pipe, the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- the temperature of the exhaust gas discharged from the internal combustion engine decreases.
- the temperature of the exhaust gas temperature increasing catalyst decreases, and there is a possibility that the temperature of the exhaust gas becomes hard to increase efficiently.
- the exhaust gas temperature increasing catalyst often has a smaller thermal capacity than the exhaust gas purifying device has, and hence there are many cases in which the temperature thereof especially tends to decrease due to the passage of the low-temperature exhaust gas.
- the exhaust gas flow rate control device may, in the exhaust gas flowing through the exhaust pipe, decrease the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- FIG. 1 is a view showing an internal combustion engine according to a first embodiment of the present invention and showing outlines of configurations of an exhaust system and a control system thereof;
- FIG. 2 is a flowchart showing an exhaust gas purifying device temperature increasing routine in the first embodiment of the present invention
- FIG. 3 is a flowchart showing another example of the exhaust gas purifying device temperature increasing routine in the first embodiment of the present invention
- FIG. 4 is a view showing an exhaust gas temperature increasing device according to a second embodiment of the present invention and showing an outline of configuration of an exhaust gas purifying device;
- FIG. 5 is a view showing the exhaust gas temperature increasing device according to the second embodiment of the present invention and showing another mode of the outline of configuration of the exhaust gas purifying device;
- FIG. 6 is a view showing the exhaust gas temperature increasing device according to the second embodiment of the present invention and showing still another mode of the outline of configuration of the exhaust gas purifying device.
- FIG. 1 is a view showing an internal combustion engine according to a first embodiment and showing outlines of configurations of an exhaust system and a control system thereof.
- An internal combustion engine 1 shown in FIG. 1 is classified as a diesel engine. Note that an interior of the internal combustion engine 1 and an intake system thereof are omitted in FIG. 1 .
- an exhaust pipe 5 through which an exhaust gas discharged from the internal combustion engine 1 flows, is connected to the internal combustion engine 1 and is further connected downstream to an unillustrated silencer.
- an exhaust gas purifying device 10 which purifies the exhaust gas from NOx and particulate matters (e.g., soot), is disposed downstream in the exhaust pipe 5 .
- an exhaust gas temperature increasing device 11 which increases the temperature of the exhaust gas purifying device 10 by increasing a temperature of the exhaust gas flowing into the exhaust gas purifying device 10 , is disposed upstream of the exhaust gas purifying device 10 in the exhaust pipe 5 .
- This exhaust gas temperature increasing device 11 is partitioned by a partition pipe 11 a having approximately the same diameter as a diameter of the exhaust pipe 5 off into an internal pipe portion 11 b and an external pipe portion 11 c .
- the internal pipe portion 11 b is provided with a flow rate control valve 11 d that determines how a flow rate of the exhaust gas flowing through the internal pipe portion 11 b and a flow rate of the exhaust gas flowing through the external pipe portion 11 c are allocated by changing a flow rate of the exhaust gas passable through the internal pipe portion 11 b .
- the external pipe portion 11 c is provided with an oxidation catalyst 11 e having oxidation capability so that the external pipe portion 11 c is filled with the oxidation catalyst 11 e .
- a fuel adding valve 12 for adding a fuel as a reducing agent to the exhaust gas flowing through the exhaust pipe 5 is disposed on the upstream side of the exhaust gas temperature increasing device 11 in the exhaust pipe 5 .
- the exhaust gas temperature increasing device 11 corresponds to exhaust gas temperature increasing unit.
- the oxidation catalyst 11 e corresponds to an exhaust gas temperature increasing catalyst.
- the internal pipe portion 11 b corresponds to an exhaust gas flow-through area.
- the fuel adding valve 12 corresponds to reducing agent adding unit.
- the flow rate control valve 11 d configures an exhaust gas flow rate control device.
- the exhaust gas purifying device 10 in the first embodiment is a device constructed so that a wall-flow type filter composed of a porous base material supports an oxidation catalyst typified by platinum (Pt) and NOx occlusion agent typified by potassium (K) and cesium (Cs).
- the exhaust gas purifying device 10 does not necessarily have to, however, be a device that support the NOx occlusion agent, wherein, for example, the NOx catalyst may be separately independently provided in the exhaust pipe 5 .
- an electronic control unit (ECU) 35 for controlling the internal combustion engine 1 and the exhaust system is provided.
- This ECU 35 is a unit for performing, in addition to controlling an operating state etc of the internal combustion engine 1 in accordance with operating conditions of the internal combustion engine 1 and in response to a request of a driver, the control of an exhaust gas purifying system including the exhaust gas purifying device 10 , the exhaust gas temperature increasing device 11 and the fuel adding valve 12 .
- Unillustrated sensors related to the control of the operating state of the internal combustion engine 1 such as an airflow meter, a crank position sensor and an accelerator position sensor, are connected via electric wirings to the ECU 35 , wherein output signals of these sensors are inputted to the ECU 35 .
- an unillustrated fuel injection valve etc for combustion in the internal combustion engine 1 is connected via the electric wiring to the ECU 35 , and, in addition, the flow rate control valve 11 d , the fuel adding valve 12 etc in the first embodiment are connected via the electric wirings to the ECU 35 , whereby these connected components are controlled.
- the ECU 35 is equipped with a CPU (Central Processing Unit), a ROM (Read-Only Memory), a RAM (Random Access Memory) etc, wherein the ROM is preinstalled with programs for executing various categories of control of the internal combustion engine 1 and is stored with a map registered with data.
- a CPU Central Processing Unit
- ROM Read-Only Memory
- RAM Random Access Memory
- the programs preinstalled in the ROM of the ECU 35 include, as one category of the program, a PM regenerating process routine (of which an explanation is omitted) for regenerating PM trapping (scavenging) capability of the exhaust gas purifying device 10 , a NOx reduction process routine for reducing and thus purifying the NOx occluded in the NOx catalyst in the exhaust gas purifying device 10 , similarly a SOx regenerating process routine (of which an explanation is omitted) for reducing and thus purifying SOx occluded in the NOx catalyst in the exhaust gas purifying device 10 , and, in addition, an exhaust gas purifying device temperature increasing routine in the first embodiment, which will be described later on.
- a PM regenerating process routine for regenerating PM trapping (scavenging) capability of the exhaust gas purifying device 10
- NOx reduction process routine for reducing and thus purifying the NOx occluded in the NOx catalyst in the exhaust gas purifying device 10
- SOx regenerating process routine of which an
- the exhaust gas purifying device 10 when starting up the internal combustion engine 1 according to the first embodiment, if a temperature of the exhaust gas purifying device 10 is low, there might be a case in which the NOx catalyst in the exhaust gas purifying device 10 does not yet reach an activation temperature and is therefore incapable of sufficiently purifying the NOx in the exhaust gas that is discharged from the internal combustion engine 1 . Then, the exhaust gas discharged from the internal combustion engine 1 is released without purifying the exhaust gas of the NOx, and such a possibility might arise that the emission is deteriorated.
- the first embodiment shall take such a contrivance that when starting up the internal combustion engine 1 , if the temperature of the exhaust gas purifying device 10 is low, a quantity of the exhaust gas passing though the internal pipe portion 11 b is decreased or zeroed by driving the flow rate control valve 11 d on a valve-closing side, and the fuel is added as a reducing agent from the fuel adding valve 12 .
- the fuel added from the fuel adding valve 12 is efficiently supplied to the oxidation catalyst 11 e , and reducing reaction is efficiently caused in the oxidation catalyst 11 e , thereby increasing the temperature of the exhaust gas discharged from the oxidation catalyst 11 e .
- This operation enables the high-temperature exhaust gas to flow into the exhaust gas purifying device 10 , whereby the exhaust gas purifying device 10 can be immediately warmed up.
- the exhaust gas temperature increasing device 11 is disposed within the exhaust pipe 5 without branching the exhaust pipe 5 configuring an exhaust passageway.
- the internal pipe portion 11 b and the external pipe portion 11 c are provided within the exhaust pipe 5 , and the oxidation catalyst 11 e is disposed so that the external pipe portion 11 c is filled with the oxidation catalyst 11 e .
- the exhaust gas temperature increasing device 11 takes a configuration that makes it harder for the heat of reaction that is generated in the oxidation catalyst 11 e to effuse outside than in the configuration of branching off into the exhaust passageway containing the oxidation catalyst and the bypath, and hence a heat retaining property of the oxidation catalyst 11 e can be improved.
- the oxidation catalyst 11 e is disposed in the external pipe portion 11 c within the exhaust pipe 5 , and therefore the high-temperature exhaust gas can be supplied concentratedly to an outer peripheral portion of a front edge surface of the exhaust gas purifying device 10 .
- a central portion of the front edge surface of the exhaust gas purifying device 10 can be restrained from having a excessively higher temperature than at the outer peripheral portion, whereby the exhaust gas purifying device 10 can be uniformly warmed up on the whole.
- FIG. 2 shows the exhaust gas purifying device temperature increasing routine in the first embodiment, and this is a routine for increasing a temperature of the NOx catalyst up to the activation temperature if the NOx catalyst of the exhaust gas purifying device 10 does not yet reach the activation temperature.
- This routine is executed by the ECU 35 at an interval of predetermined time during the operation of the internal combustion engine 1 .
- a catalyst temperature T defined as the temperature of the NOx catalyst of the exhaust gas purifying device 10 is acquired.
- This catalyst temperature T may be deduced in a way that detects a temperature of cooling water of the internal combustion engine 1 by use of an unillustrated cooling water temperature sensor, and the temperature of the exhaust gas discharged from the exhaust gas purifying device 10 may also be detected directly by an unillustrated exhaust gas temperature sensor.
- a relationship between elapsed time since the startup of the internal combustion engine 1 has begun and the catalyst temperature T is previously obtained, and the catalyst temperature T may also be deduced from the elapsed time since the startup of the internal combustion engine 1 has begun.
- the flow rate control valve 11 d is fully opened. Through this valve opening, the exhaust gas discharged from the internal combustion engine 1 flows directly into the exhaust gas purifying device 10 and is purified of the NOx therein.
- the fuel serving as the reducing agent is added from the fuel adding valve 12 to the exhaust gas flowing through the exhaust pipe 5 .
- the fuel being thus added it follows that the fuel added from the fuel adding valve 12 is carried together with substantially the entire quantity of exhaust gas getting to flow to the oxidation catalyst 11 e and is thus supplied to the oxidation catalyst 11 e .
- the operation proceeds to S 105 .
- S 105 it is judged whether or not the fuel added from the fuel adding valve 12 reaches the oxidation catalyst 11 e .
- the judgment that the fuel added from the fuel adding valve 12 reaches the oxidation catalyst 11 e may be made by reading, into the ECU 35 , an output of an unillustrated air-fuel ratio sensor provided upstream immediately of the oxidation catalyst 11 e , and may also be made by knowing that the temperature of the oxidation catalyst 11 e starts abruptly increasing.
- a relationship between the operating state of the internal combustion engine 1 and a period of time till the fuel added from the fuel adding valve 12 reaches the oxidation catalyst 11 e is mapped beforehand, and the above judgment may be made based on whether or not there is an elapse of the time read from the map in accordance with the operating state of the internal combustion engine 1 when executing the exhaust gas purifying device temperature increasing routine since the fuel has been added from the fuel adding valve 12 .
- the operation returns to a status before the process in S 105 , wherein it is again judged in S 105 whether the fuel added from the fuel adding valve 12 reaches the oxidation catalyst 11 e or not. Then, the process in S 105 is repeatedly executed till judging that the fuel reaches the oxidation catalyst 11 e . Subsequently, when judging in S 105 that the fuel reaches the oxidation catalyst 11 e , the operation proceeds to S 106 .
- the predetermined opening degree is an opening degree capable of sufficiently restraining the fuel reaching the oxidation catalyst 11 e from passing intact through the oxidation catalyst 11 e and amply supplying the exhaust gas having its temperature increased in the oxidation catalyst 11 e to the exhaust gas purifying device 10 in order to increase the temperature of the exhaust gas purifying device 10 .
- This predetermined opening degree may be previously mapped in relation with the operating state of the internal combustion engine land may be, when executing S 106 , derived by reading from the map the opening degree corresponding to the operating state of the internal combustion engine 1 on this occasion.
- the catalyst temperature increasing routine in the first embodiment is that if the temperature of the NOx catalyst in the exhaust gas purifying device 10 is lower than the activation temperature, the flow rate control valve 11 d is fully closed, and the fuel is added into the exhaust gas from the fuel adding valve 12 , thereby making it possible to ensure transportability enough for having the added fuel reached the oxidation catalyst 11 e.
- the flowrate control valve 11 d is opened, and the exhaust gas from the internal combustion engine 1 flows to both of the external pipe portion 11 c and the internal pipe portion 11 b , whereby the fuel reaching the oxidation catalyst 11 e can be refrained from passing intact through the oxidation catalyst 11 e within the short period of time, and the exhaust gas the temperature of which has been increased by the reducing reaction in the oxidation catalyst 11 e can be supplied more surely to the exhaust gas purifying device 10 .
- the flowrate control valve 11 d may be opened to a much larger opening degree, and an inflow quantity of the exhaust gas discharged from the internal combustion engine 1 into the oxidation catalyst 11 e may thus be decreased to a greater degree.
- the low-temperature exhaust gas in the decelerating state of the internal combustion engine 1 can be refrained from flowing into the oxidation catalyst 11 e , and the oxidation catalyst 11 e can be also restrained from being cooled down.
- FIG. 3 shows an example of the exhaust gas purifying device temperature increasing routine in that case.
- a different point between the control in the present routine and the control in FIG. 2 is that in the present routine, after judging in S 105 that the fuel reaches the oxidation catalyst 11 e , the operation proceeds to not S 106 but S 201 . It is judged in S 201 whether the internal combustion engine 1 is in the decelerating state or not. To be specific, an output of an unillustrated accelerator position sensor is read into the ECU 35 , and it may be judged whether an accelerator tread-on quantity obtained from this value is zero or not. A state where the accelerator is not trodden on may be defined as the decelerating state.
- the second embodiment will exemplify another configuration of the exhaust gas temperature increasing device 11 explained in FIG. 1 .
- FIG. 4 is a view showing an outline of the configuration of the exhaust gas temperature increasing device 11 in the second embodiment.
- a first mode of the second embodiment is that as illustrated in FIG. 4 (A), an exhaust gas purifying device 20 and an exhaust gas temperature increasing device 21 are substantially equalized in their diameters and are provided within a pipe having the same diameter. According to the first mode, the exhaust gas can be more smoothly flowed into the exhaust gas purifying device 20 without disturbing the flow of the exhaust gas discharged from the exhaust gas temperature increasing device 21 .
- a stepped portion 21 f in FIG. 4(A) is not positioned between the exhaust gas temperature increasing device 21 and the exhaust gas purifying device 20 . It is therefore possible to restrain a large amount of heat from escaping outwardly of the exhaust pipe 5 because the exhaust gas discharged from the oxidation catalyst 21 e flows against the stepped portion 21 f.
- FIG. 4 (B) illustrates another mode of the second embodiment.
- the oxidation catalyst 21 e is provided not in the external pipe portion 21 c but in an internal pipe portion 21 b .
- the oxidation catalyst 21 e does not abut on the external portion of the exhaust pipe 5 , whereby the heat retaining property of the oxidation catalyst 21 e can be more enhanced.
- FIG. 5 such a mode may be taken that the exhaust gas purifying device 20 is partially inserted into the internal pipe portion 21 b .
- FIG. 5(A) shows a state where the flow rate control valve 21 d is opened
- FIG. 5(B) shows a state where the flow rate control valve 21 d is fully closed.
- FIG. 6 illustrates still another mode of the second embodiment.
- an electro-thermic heater 21 g is provided in the oxidation catalyst 21 e . Then, when heating up the exhaust gas purifying device 20 , to begin with, the electro-thermic heater 21 g is electrified to emit the heat, thereby increasing the temperature of the oxidation catalyst 21 e itself. When done so, it is feasible to increase the temperature of the oxidation catalyst 21 e itself over the activation temperature more surely and to raise the temperature of the exhaust gas flowing into the exhaust gas purifying device 20 more certainly.
- a glow plug 21 h is provided upstream immediately of the oxidation catalyst 21 e . Then, when heating up the exhaust gas purifying device 20 , at first, the glow plug 21 h is electrified to emit the heat, the temperature of the oxidation catalyst 21 e itself is increased, and the temperature of the exhaust gas passing through the external pipe portion 21 c is raised. Then, the fuel is added from the fuel adding valve 12 . With this operation, the temperature of the oxidation catalyst 21 e itself can be increased over the activation temperature with more of the certainty, and the temperature of the exhaust gas discharged from the oxidation catalyst 21 e can be further increased. Accordingly, the temperature of the exhaust gas flowing into the exhaust gas purifying device 20 can be raised more certainly.
- the embodiments discussed above have exemplified the case of warming up the exhaust gas purifying device 10 or 20 when starting up the internal combustion engine 1 .
- the configurations and the control in the embodiments discussed above may be applied to a case of increasing the temperature of the NOx catalyst or of the filter in a SOx poisoning recovery process and in the PM regenerating process of the filter in the exhaust gas purifying device 10 or 20 .
- the embodiments discussed above have exemplified the example of adding the fuel as the reducing agent from the fuel adding valve 12 , however, these embodiments may be applied to the exhaust gas purifying system that involves using urea water as the reducing agent. Moreover, these embodiments may also be applied to the exhaust gas purifying system of the internal combustion engine other than the diesel engine. In addition, these embodiments may also be applied to the exhaust gas purifying system adding the fuel as the reducing agent by executing the sub-injection such as VIGOM injection, POST injection, etc., from a fuel injection valve of the internal combustion engine.
- the sub-injection such as VIGOM injection, POST injection, etc.
- full-close state of the flow rate control valve 11 d in the embodiments discussed above does not necessarily mean completely closed state of valve. It can include the state that the flow rate control valve 11 d is closed to a sufficiently small opening degree with which substantially an entire quantity of the exhaust gas from the internal combustion engine 1 can flow into the oxidation catalyst 11 e.
- the temperature of the exhaust gas purifying device in the exhaust system of the internal combustion engine can be increased more efficiently or more surely with the much simpler configuration.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
An exhaust passageway of the internal combustion engine is formed of a single exhaust pipe 5. A portion 11 b configuring a passageway through which the exhaust gas passes and a portion 11 c provided with a catalyst 11 e heating up the exhaust gas by emitting heat upon being supplied with a reducing agent, are provided in parallel so as to share a section of the single exhaust pipe with each other on an upstream side 11 of an exhaust gas purifying device 10 in the exhaust pipe 5. In the exhaust gas flowing through the exhaust pipe 5, allocation of a quantity of the exhaust gas passing through the catalyst 11 e and a quantity of the exhaust gas passing through the passageway 11 b, is set changeable.
Description
- This is a 371 national phase application of PCT/JP2006/307008 filed 28 Mar. 2006, claiming priority to Japanese Patent Application No. JP 2005-091485 filed 28 Mar. 2005, the contents of which are incorporated herein by reference.
- The present invention relates to an exhaust gas purifying system of an internal combustion engine.
- An exhaust gas from an internal combustion engine contains harmful substances such as NOx (nitrogen oxide). It is known that a NOx catalyst for purifying the exhaust gas of NOx is provided in an exhaust system of the internal combustion engine in order to decrease emissions of these harmful substances. In this technology, when a temperature of the NOx catalyst is low, there might be a case that a NOx purifying efficiency decreases. Accordingly, the temperature of the NOx catalyst needs increasing up to a temperature at which the exhaust gas can be sufficiently purified of NOx.
- On the other hand, the exhaust gas from the internal combustion engine contains particulate matters (PM) of which a main component is carbon. A known technology for preventing the emissions of these particulate matters into the atmospheric air involves providing an exhaust system of the internal combustion engine with a particulate filter (which will hereinafter simply be termed a [filter]) for trapping (scavenging) the particulate matters.
- In this type of filter, when a deposition quantity of the trapped particulate matters rises, a backpressure in the exhaust gas increases due to clogging of the filter, and engine performance declines. To cope with this, a temperature of the filter is raised by increasing the temperature of the exhaust gas introduced into the filter, and the trapped particulate matters are removed by oxidation, thus scheming to regenerate the exhaust gas purifying performance of the filter (which will hereinafter be referred to as a [PM regenerating process]).
- In the above PM regenerating process, when the temperature of the filter is low, there might be a case of being unable to sufficiently oxidation-remove the particulate matters trapped by the filter. Accordingly, in this case also, the filter temperature needs increasing up to the temperature at which the particulate matters trapped by the filter can be sufficiently removed by oxidation.
- In this respect, as disclosed in Japanese Patent Application Laid-Open Publication No. 2003-166417, such a technology is proposed that there are provided a filter, an oxidation catalyst disposed on an upstream side of the filter and a bypath via which the exhaust gas bypasses the oxidation catalyst, and the filter is warmed up as soon as possible when executing the PM regenerating process by switchover as to which way, the bypath or the oxidation catalyst, the exhaust gas should pass through. Alternatively, as disclosed in published Japanese translations of PCT international publication for patent applications No. 2003-533626, a technology is proposed, wherein a catalyst-type burner and a fuel adding device are provided upstream of the filter, and the PM regenerating process can be executed surely at a low cost.
- Herein, in the former technology, there was a case in which when the exhaust gas passed through the bypath, the temperature of the exhaust gas decreased, and the filter temperature was hard to rise efficiently. Further, in the latter technology, during a normal operation of the internal combustion engine, the catalyst-type burner dissipated a great amount of exhaust heat, and there was a possibility that the filter temperature might be decreased.
- It is an object of the present invention to provide a technology capable of increasing the temperature of an exhaust gas purifying device in an exhaust system of an internal combustion engine more efficiently or more surely with a much simpler configuration.
- The following is a greatest feature of the present invention for accomplishing the above object. An exhaust passageway of the internal combustion engine is formed of a single exhaust pipe on an upstream side of the exhaust gas purifying device, and a portion configuring a passageway through which the exhaust gas passes and a portion provided with a catalyst heating up the exhaust gas by emitting heat upon being supplied with a reducing agent, are provided in parallel with each other in the exhaust pipe. Then, in the exhaust gas flowing through the exhaust pipe, allocation of a quantity of the exhaust gas passing through the catalyst heating up the exhaust gas and a quantity of the exhaust gas passing through the passageway, is set changeable.
- More specifically, in an exhaust gas purifying system of an internal combustion engine, comprising:
- an exhaust gas purifying device provided in an exhaust passageway of the internal combustion engine, purifying an exhaust gas passing through the exhaust passageway and heated up to a predetermined temperature or higher with the result that purifying capability thereof is improved;
- exhaust gas temperature increasing unit provided on an upstream side of the exhaust gas purifying device in the exhaust passageway; and
- reducing agent adding unit provided on the upstream side of the exhaust gas temperature increasing unit in the exhaust passageway and adding a reducing agent to the exhaust gas passing through the exhaust passageway,
- an improvement is characterized in that the exhaust gas temperature increasing unit includes:
- an exhaust gas temperature increasing catalyst provided in a single exhaust pipe configuring the exhaust passageway so that an exhaust gas flow-through area trough which the exhaust gas should pass is left, supplied with the reducing agent added from the reducing agent adding unit and thereby emitting heat; and
- an exhaust gas flowrate control device controlling, in the exhaust gas passing though the exhaust pipe, allocation of a quantity of the exhaust gas passing the exhaust gas flow-through area and a quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- Herein, in the case of purifying the exhaust gas of the NOx by the NOx catalyst provided in the exhaust system of the internal combustion engine, the NOx catalyst needs to have a temperature equal to or higher than an activation temperature at which the NOx can be occluded. Further, in the case of executing the PM regenerating process on the filter provided in the exhaust system, it is required that a temperature of the filter be kept equal to or higher than a temperature at which the particulate matters trapped by the filter can be removed by oxidation.
- Then, for attaining this, there might be a case of taking a method by which the exhaust gas temperature increasing catalyst for increasing the temperature of the exhaust gas flowing into the NOx catalyst or the filter is provided on the upstream side of the NOx catalyst or the filter, and the temperature of the exhaust gas flowing into the NOx catalyst or the filter is increased by reaction heat generated by supplying the reducing agent to this exhaust gas temperature increasing catalyst.
- In such a case, if a heat retaining property of the exhaust gas temperature increasing catalyst itself is insufficient, even when supplying the reducing agent to the exhaust gas temperature increasing catalyst, there was a possibility that the temperature of the exhaust gas flowing into the NOx catalyst or the filter could not be amply increased.
- Further, for example, if the temperature of the NOx catalyst or the filter is high, there might occur such a case that the exhaust gas not passing through the exhaust gas temperature increasing catalyst is to flow directly into the NOx catalyst or the filter. For attaining this, it is considered that a bypath via which the exhaust gas bypasses the exhaust gas temperature increasing catalyst is provided separately from the exhaust pipe. In this case, however, the exhaust passageway comes to have a complicated structure, and there was a possibility that mountability on a vehicle declines or it becomes difficult to reduce costs.
- Such being the case, according to the present invention, the exhaust gas temperature increasing unit is provided on the upstream side of the exhaust gas purifying device in the exhaust passageway. Then, in the exhaust gas temperature increasing unit, the exhaust gas temperature increasing catalyst is provided in the single exhaust pipe configuring the exhaust passageway so as to occupy part of the section of the exhaust pipe, and a remaining area of the section of the exhaust pipe is set as the exhaust gas flow-through area through which the exhaust gas passes. Then, the exhaust gas flow rate control device can control, in the exhaust gas flowing through the exhaust pipe, the allocation of the quantity of the exhaust gas passing through the exhaust gas flow-through area and the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- With this contrivance, the exhaust gas temperature increasing catalyst and the exhaust gas flow-through area can be formed in parallel with each other in an interior of the single exhaust pipe configuring the exhaust passageway, and hence a contact area between the exhaust gas temperature increasing catalyst and the external portion of the exhaust passageway can be decreased to the greatest possible degree. Further, when the exhaust gas passes through the exhaust gas flow-through area, the heat of the exhaust gas can be efficiently transferred to the exhaust gas temperature increasing catalyst. As a result thereof, the heat retaining property of the exhaust gas temperature increasing catalyst can be improved.
- Moreover, both of the exhaust gas temperature increasing catalyst and the exhaust gas flow-through area through which the exhaust gas passes can be provided in the single exhaust pipe, and the structure can be thus simplified, whereby the mountability of the exhaust gas purifying system on the vehicle can be improved, and the cost reduction can be also attained.
- Furthermore, according to the present invention, the exhaust gas flow-through area may be disposed in a central portion in section perpendicular to an exhaust gas pass-through direction in the exhaust pipe, and the exhaust gas temperature increasing catalyst may be disposed outwardly of the exhaust gas flow-through area within the section.
- Herein, if the exhaust gas warmed up by the exhaust gas temperature increasing catalyst uniformly flows to an upstream-sided edge surface of the exhaust gas purifying device, the temperature of the exhaust gas purifying device tends to be high at its central portion and becomes lower as it gets closer to a peripheral portion thereof. This is attributed to an escape of the heat into the outside air from the outer peripheral portion of the exhaust gas purifying device.
- By contrast, according to the present invention, the exhaust gas flow-through area through which the exhaust gas passes is disposed at the central portion in the section perpendicular to an exhaust gas pass-through direction in the exhaust pipe, and the exhaust gas temperature increasing catalyst is disposed outside of the exhaust gas flow-through area within the section. With this arrangement, the exhaust gas temperature increasing catalyst can be distributed over the outer peripheral portion in the section perpendicular to the exhaust gas pass-through direction in the exhaust pipe. This contrivance being thus made, the exhaust gas heated up by the exhaust gas temperature increasing catalyst can be supplied concentratedly to the outer peripheral portion of the exhaust gas purifying device, and, even when the heat escapes into the outside air from the outer peripheral portion of the exhaust gas purifying device, the temperature of the exhaust gas purifying device can be increased uniformly.
- Further, according to the present invention, the exhaust gas flow rate control device may be set capable of selecting, by controlling the allocation, a state where substantially an entire quantity of the exhaust gas flowing through the exhaust pipe passes through the exhaust gas flow-through area, a state where substantially the entire quantity of the exhaust gas flowing through the exhaust pipe passes through the exhaust gas temperature increasing catalyst, and a state where substantially the entire quantity of the exhaust gas flowing through the exhaust pipe passes through both of the exhaust gas flow-through area and the exhaust gas temperature increasing catalyst.
- This contrivance being thus made, the exhaust gas flow rate control device selects the state where substantially the entire quantity of the exhaust gas flowing through the exhaust pipe passes through the exhaust gas temperature increasing catalyst, and the reducing agent adding unit adds the reducing agent to the exhaust gas, whereby the exhaust gas temperature increasing catalyst is supplied with the entire quantity of the exhaust gas and can get the reducing reaction caused by the reducing agent. This enables an inflow of only the high-temperature exhaust gas into the exhaust gas purifying device.
- Further, the exhaust gas flow rate control device selects the state where substantially the entire quantity of the exhaust gas flowing through the exhaust pipe passes through the exhaust gas flow-through area, whereby the exhaust gas can be flowed directly into the exhaust gas purifying device without passing through the exhaust gas temperature increasing catalyst. With this contrivance, if the exhaust temperature of the exhaust gas discharged from the internal combustion engine is high such as when in a high-load operation, the exhaust gas purifying device can be heated up by a thermal energy of the exhaust gas. Further, when the temperature of the exhaust gas purifying device is high and in a low-load operation, the exhaust gas temperature increasing catalyst can be restrained from becoming an excessively high temperature by flowing a comparatively low-temperature exhaust gas directly into the exhaust gas purifying device.
- Moreover, if the temperature of the exhaust gas discharged from the internal combustion engine is high such as when in the high-load operation and if the temperature of the exhaust gas temperature increasing catalyst has already been high, the high-temperature exhaust gas can be restrained from further flowing into the exhaust gas temperature increasing catalyst. This makes it possible to restrain the exhaust gas temperature increasing catalyst from becoming the excessively high temperature. In addition, if the temperature of the exhaust gas discharged from the internal combustion engine is low such as when in the low-load operation, the low-temperature exhaust gas can be restrained from flowing into the exhaust gas temperature increasing catalyst. This makes it feasible to restrain the decrease in temperature of the exhaust gas temperature increasing catalyst.
- Moreover, the exhaust gas flow rate control device selects the state where the exhaust gas flowing through the exhaust pipe passes through both of the exhaust gas flow-through area and the exhaust gas temperature increasing catalyst, whereby the exhaust gas heated up as it passes through the exhaust gas temperature increasing catalyst and the exhaust gas not passing through the exhaust gas temperature increasing catalyst can be flowed in a properly mixed state thereof into the exhaust gas purifying device. This enables improvement of controllability of the temperature of the exhaust gas purifying device.
- Furthermore, according to the present invention, when heating up the exhaust gas purifying device,
- the reducing agent adding unit may add the reducing agent to the exhaust gas passing through the exhaust passageway, and the exhaust gas flow rate control device may control the allocation in order to make substantially the entire quantity of the exhaust gas flowing through the exhaust pipe pass through the exhaust gas temperature increasing catalyst, and
- the exhaust gas flow rate control device may, after the reducing agent added from the reducing agent adding unit has reached the exhaust gas temperature increasing catalyst, control the allocation in order to decrease, in the exhaust gas flowing through the exhaust pipe, the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- Namely, in the case of heating up the exhaust gas purifying device as described above, it is desirable that the high-temperature exhaust gas be flowed into the exhaust gas purifying device. For attaining this, the reducing agent adding unit adds the reducing agent to the exhaust gas flowing through the exhaust passageway, and the exhaust gas flow rate control device controls the allocation in order for the exhaust gas temperature increasing catalyst to admit the passage of substantially the entire quantity of the exhaust gas flowing trough the exhaust pipe. Under this control, the reducing agent added from the reducing agent adding unit can be efficiently led to the exhaust gas temperature increasing catalyst.
- Then, after the reducing agent added from the reducing agent adding unit has reached the exhaust gas temperature increasing catalyst, the exhaust gas flow rate control device controls, in the exhaust gas flowing through the exhaust pipe, the allocation in order to decrease the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst. The allocation being thus controlled, after the reducing agent has reached the exhaust gas temperature increasing catalyst, the flow rate of the exhaust gas passing though the exhaust gas temperature increasing catalyst decreases, and therefore the reducing agent can be restrained from passing intact through the exhaust gas temperature increasing catalyst. Then, the reducing agent can be stayed for a sufficiently long period of time in the exhaust gas temperature increasing catalyst. As a result, the sufficient reducing reaction can be caused in the exhaust gas temperature increasing catalyst, and the temperature of the exhaust gas discharged from the exhaust gas temperature increasing catalyst can be increased more surely.
- Further, according to the present invention, the exhaust gas flow rate control device may, during a decelerating operation of a vehicle mounted with the internal combustion engine, control the allocation in order to decrease, in the exhaust gas flowing through the exhaust pipe, the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst.
- Herein, during a decelerating operation of the internal combustion engine, there is a case where the temperature of the exhaust gas discharged from the internal combustion engine decreases. Then, in such a case, when the low-temperature exhaust gas passes through the exhaust gas temperature increasing catalyst, the temperature of the exhaust gas temperature increasing catalyst decreases, and there is a possibility that the temperature of the exhaust gas becomes hard to increase efficiently. Herein, the exhaust gas temperature increasing catalyst often has a smaller thermal capacity than the exhaust gas purifying device has, and hence there are many cases in which the temperature thereof especially tends to decrease due to the passage of the low-temperature exhaust gas.
- By contrast, during the decelerating operation of the vehicle mounted with the internal combustion engine, the exhaust gas flow rate control device may, in the exhaust gas flowing through the exhaust pipe, decrease the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst. With this operation, if the temperature of the exhaust gas discharged from the internal combustion engine is low, it is possible to decrease the quantity of the exhaust gas passing through the exhaust gas temperature increasing catalyst and to restrain the drop in temperature of the exhaust gas temperature increasing catalyst.
- It should be noted that the means for solving the problems in the invention can be used by combining these means as much as possible.
-
FIG. 1 is a view showing an internal combustion engine according to a first embodiment of the present invention and showing outlines of configurations of an exhaust system and a control system thereof; -
FIG. 2 is a flowchart showing an exhaust gas purifying device temperature increasing routine in the first embodiment of the present invention; -
FIG. 3 is a flowchart showing another example of the exhaust gas purifying device temperature increasing routine in the first embodiment of the present invention; -
FIG. 4 is a view showing an exhaust gas temperature increasing device according to a second embodiment of the present invention and showing an outline of configuration of an exhaust gas purifying device; -
FIG. 5 is a view showing the exhaust gas temperature increasing device according to the second embodiment of the present invention and showing another mode of the outline of configuration of the exhaust gas purifying device; and -
FIG. 6 is a view showing the exhaust gas temperature increasing device according to the second embodiment of the present invention and showing still another mode of the outline of configuration of the exhaust gas purifying device. - An in-depth description of a best mode for carrying out the present invention will hereinafter be given in an exemplifying manner with reference to the drawings.
-
FIG. 1 is a view showing an internal combustion engine according to a first embodiment and showing outlines of configurations of an exhaust system and a control system thereof. Aninternal combustion engine 1 shown inFIG. 1 is classified as a diesel engine. Note that an interior of theinternal combustion engine 1 and an intake system thereof are omitted inFIG. 1 . - In
FIG. 1 , anexhaust pipe 5, through which an exhaust gas discharged from theinternal combustion engine 1 flows, is connected to theinternal combustion engine 1 and is further connected downstream to an unillustrated silencer. Moreover, an exhaustgas purifying device 10, which purifies the exhaust gas from NOx and particulate matters (e.g., soot), is disposed downstream in theexhaust pipe 5. Then, an exhaust gastemperature increasing device 11, which increases the temperature of the exhaustgas purifying device 10 by increasing a temperature of the exhaust gas flowing into the exhaustgas purifying device 10, is disposed upstream of the exhaustgas purifying device 10 in theexhaust pipe 5. - This exhaust gas
temperature increasing device 11 is partitioned by apartition pipe 11 a having approximately the same diameter as a diameter of theexhaust pipe 5 off into aninternal pipe portion 11 b and anexternal pipe portion 11 c. Then, theinternal pipe portion 11 b is provided with a flowrate control valve 11 d that determines how a flow rate of the exhaust gas flowing through theinternal pipe portion 11 b and a flow rate of the exhaust gas flowing through theexternal pipe portion 11 c are allocated by changing a flow rate of the exhaust gas passable through theinternal pipe portion 11 b. Further, theexternal pipe portion 11 c is provided with anoxidation catalyst 11 e having oxidation capability so that theexternal pipe portion 11 c is filled with theoxidation catalyst 11 e. Moreover, afuel adding valve 12 for adding a fuel as a reducing agent to the exhaust gas flowing through theexhaust pipe 5 is disposed on the upstream side of the exhaust gastemperature increasing device 11 in theexhaust pipe 5. - Herein, the exhaust gas
temperature increasing device 11 corresponds to exhaust gas temperature increasing unit. Further, theoxidation catalyst 11 e corresponds to an exhaust gas temperature increasing catalyst. Moreover, theinternal pipe portion 11 b corresponds to an exhaust gas flow-through area. Thefuel adding valve 12 corresponds to reducing agent adding unit. Still further, the flowrate control valve 11 d configures an exhaust gas flow rate control device. - The exhaust
gas purifying device 10 in the first embodiment is a device constructed so that a wall-flow type filter composed of a porous base material supports an oxidation catalyst typified by platinum (Pt) and NOx occlusion agent typified by potassium (K) and cesium (Cs). The exhaustgas purifying device 10 does not necessarily have to, however, be a device that support the NOx occlusion agent, wherein, for example, the NOx catalyst may be separately independently provided in theexhaust pipe 5. - In the thus-constructed
internal combustion engine 1 and the exhaust system thereof, an electronic control unit (ECU) 35 for controlling theinternal combustion engine 1 and the exhaust system, is provided. ThisECU 35 is a unit for performing, in addition to controlling an operating state etc of theinternal combustion engine 1 in accordance with operating conditions of theinternal combustion engine 1 and in response to a request of a driver, the control of an exhaust gas purifying system including the exhaustgas purifying device 10, the exhaust gastemperature increasing device 11 and thefuel adding valve 12. - Unillustrated sensors related to the control of the operating state of the
internal combustion engine 1, such as an airflow meter, a crank position sensor and an accelerator position sensor, are connected via electric wirings to theECU 35, wherein output signals of these sensors are inputted to theECU 35. On the other hand, an unillustrated fuel injection valve etc for combustion in theinternal combustion engine 1 is connected via the electric wiring to theECU 35, and, in addition, the flowrate control valve 11 d, thefuel adding valve 12 etc in the first embodiment are connected via the electric wirings to theECU 35, whereby these connected components are controlled. - Further, the
ECU 35 is equipped with a CPU (Central Processing Unit), a ROM (Read-Only Memory), a RAM (Random Access Memory) etc, wherein the ROM is preinstalled with programs for executing various categories of control of theinternal combustion engine 1 and is stored with a map registered with data. The programs preinstalled in the ROM of theECU 35 include, as one category of the program, a PM regenerating process routine (of which an explanation is omitted) for regenerating PM trapping (scavenging) capability of the exhaustgas purifying device 10, a NOx reduction process routine for reducing and thus purifying the NOx occluded in the NOx catalyst in the exhaustgas purifying device 10, similarly a SOx regenerating process routine (of which an explanation is omitted) for reducing and thus purifying SOx occluded in the NOx catalyst in the exhaustgas purifying device 10, and, in addition, an exhaust gas purifying device temperature increasing routine in the first embodiment, which will be described later on. - By the way, when starting up the
internal combustion engine 1 according to the first embodiment, if a temperature of the exhaustgas purifying device 10 is low, there might be a case in which the NOx catalyst in the exhaustgas purifying device 10 does not yet reach an activation temperature and is therefore incapable of sufficiently purifying the NOx in the exhaust gas that is discharged from theinternal combustion engine 1. Then, the exhaust gas discharged from theinternal combustion engine 1 is released without purifying the exhaust gas of the NOx, and such a possibility might arise that the emission is deteriorated. - Such being the case, the first embodiment shall take such a contrivance that when starting up the
internal combustion engine 1, if the temperature of the exhaustgas purifying device 10 is low, a quantity of the exhaust gas passing though theinternal pipe portion 11 b is decreased or zeroed by driving the flowrate control valve 11 d on a valve-closing side, and the fuel is added as a reducing agent from thefuel adding valve 12. - With this contrivance, the fuel added from the
fuel adding valve 12 is efficiently supplied to theoxidation catalyst 11 e, and reducing reaction is efficiently caused in theoxidation catalyst 11 e, thereby increasing the temperature of the exhaust gas discharged from theoxidation catalyst 11 e. This operation enables the high-temperature exhaust gas to flow into the exhaustgas purifying device 10, whereby the exhaustgas purifying device 10 can be immediately warmed up. - On this occasion, in the first embodiment, the exhaust gas
temperature increasing device 11 is disposed within theexhaust pipe 5 without branching theexhaust pipe 5 configuring an exhaust passageway. To be specific, theinternal pipe portion 11 b and theexternal pipe portion 11 c are provided within theexhaust pipe 5, and theoxidation catalyst 11 e is disposed so that theexternal pipe portion 11 c is filled with theoxidation catalyst 11 e. With this contrivance, as compared with a configuration of branching off into the exhaust passageway containing the oxidation catalyst and a bypath, the exhaust gastemperature increasing device 11 can be downsized on the whole, and mountability onto a vehicle can be improved. Further, cost reduction can be attained. Still further, the exhaust gastemperature increasing device 11 takes a configuration that makes it harder for the heat of reaction that is generated in theoxidation catalyst 11 e to effuse outside than in the configuration of branching off into the exhaust passageway containing the oxidation catalyst and the bypath, and hence a heat retaining property of theoxidation catalyst 11 e can be improved. - Yet further, in the first embodiment, the
oxidation catalyst 11 e is disposed in theexternal pipe portion 11 c within theexhaust pipe 5, and therefore the high-temperature exhaust gas can be supplied concentratedly to an outer peripheral portion of a front edge surface of the exhaustgas purifying device 10. As a result, a central portion of the front edge surface of the exhaustgas purifying device 10 can be restrained from having a excessively higher temperature than at the outer peripheral portion, whereby the exhaustgas purifying device 10 can be uniformly warmed up on the whole. - Next, the detailed control on the occasion of warming up the exhaust
gas purifying device 10 in the first embodiment will be explained.FIG. 2 shows the exhaust gas purifying device temperature increasing routine in the first embodiment, and this is a routine for increasing a temperature of the NOx catalyst up to the activation temperature if the NOx catalyst of the exhaustgas purifying device 10 does not yet reach the activation temperature. This routine is executed by theECU 35 at an interval of predetermined time during the operation of theinternal combustion engine 1. - Upon executing this routine, to start with, in S101, a catalyst temperature T defined as the temperature of the NOx catalyst of the exhaust
gas purifying device 10 is acquired. This catalyst temperature T may be deduced in a way that detects a temperature of cooling water of theinternal combustion engine 1 by use of an unillustrated cooling water temperature sensor, and the temperature of the exhaust gas discharged from the exhaustgas purifying device 10 may also be detected directly by an unillustrated exhaust gas temperature sensor. Alternatively, a relationship between elapsed time since the startup of theinternal combustion engine 1 has begun and the catalyst temperature T, is previously obtained, and the catalyst temperature T may also be deduced from the elapsed time since the startup of theinternal combustion engine 1 has begun. When finishing the process in S101, the operation proceeds to S102. - In S102, it is judged whether the catalyst temperature T is equal to or higher than the activation temperature of the NOx catalyst in the exhaust
gas purifying device 10. Then, when judging that the catalyst temperature T is equal to or higher than the activation temperature of the NOx catalyst in the exhaustgas purifying device 10, the exhaustgas purifying device 10 is judged to be in a state capable of purifying the exhaust gas of the NOx that is discharged from theinternal combustion engine 1, and hence the operation proceeds to S107. - In S107, the flow
rate control valve 11 d is fully opened. Through this valve opening, the exhaust gas discharged from theinternal combustion engine 1 flows directly into the exhaustgas purifying device 10 and is purified of the NOx therein. - While on the other hand, when judging in S102 that the catalyst temperature T is lower than the activation temperature, the catalyst temperature T must be raised up to the activation temperature or higher as soon as possible, and therefore the operation proceeds to S103. In S103, the flow
rate control valve 11 d is fully closed. Through this operation, it follows that substantially an entire quantity of the exhaust gas from theinternal combustion engine 1 flows into theoxidation catalyst 11 e. When terminating the process in S103, the operation proceeds to S104. - In S104, the fuel serving as the reducing agent is added from the
fuel adding valve 12 to the exhaust gas flowing through theexhaust pipe 5. The fuel being thus added, it follows that the fuel added from thefuel adding valve 12 is carried together with substantially the entire quantity of exhaust gas getting to flow to theoxidation catalyst 11 e and is thus supplied to theoxidation catalyst 11 e. When finishing the process in S104, the operation proceeds to S105. - In S105, it is judged whether or not the fuel added from the
fuel adding valve 12 reaches theoxidation catalyst 11 e. Herein, the judgment that the fuel added from thefuel adding valve 12 reaches theoxidation catalyst 11 e may be made by reading, into theECU 35, an output of an unillustrated air-fuel ratio sensor provided upstream immediately of theoxidation catalyst 11 e, and may also be made by knowing that the temperature of theoxidation catalyst 11 e starts abruptly increasing. Moreover, a relationship between the operating state of theinternal combustion engine 1 and a period of time till the fuel added from thefuel adding valve 12 reaches theoxidation catalyst 11 e, is mapped beforehand, and the above judgment may be made based on whether or not there is an elapse of the time read from the map in accordance with the operating state of theinternal combustion engine 1 when executing the exhaust gas purifying device temperature increasing routine since the fuel has been added from thefuel adding valve 12. - If it is judged in S105 that the fuel does not yet reach the
oxidation catalyst 11 e, the operation returns to a status before the process in S105, wherein it is again judged in S105 whether the fuel added from thefuel adding valve 12 reaches theoxidation catalyst 11 e or not. Then, the process in S105 is repeatedly executed till judging that the fuel reaches theoxidation catalyst 11 e. Subsequently, when judging in S105 that the fuel reaches theoxidation catalyst 11 e, the operation proceeds to S106. - In S106, the full-close of the flow
rate control valve 11 d is cancelled, and the flowrate control valve 11 d is opened to a predetermined opening degree. With this valve opening, the flow rate of the exhaust gas flowing to theoxidation catalyst 11 e decreases. The operation being thus done, the fuel reaching theoxidation catalyst 11 e can be restrained from passing intact through theoxidation catalyst 11 e within a short period of time and can be made to stay within theoxidation catalyst 11 e over a sufficient period of time. As a result, the temperature of the exhaust gas after passing through theoxidation catalyst 11 e can be sufficiently increased, and the exhaustgas purifying device 10 can be heated up quickly. Further, a fuel consumption for heating up the exhaustgas purifying device 10 can be decreased. - Herein, the predetermined opening degree is an opening degree capable of sufficiently restraining the fuel reaching the
oxidation catalyst 11 e from passing intact through theoxidation catalyst 11 e and amply supplying the exhaust gas having its temperature increased in theoxidation catalyst 11 e to the exhaustgas purifying device 10 in order to increase the temperature of the exhaustgas purifying device 10. This predetermined opening degree may be previously mapped in relation with the operating state of the internal combustion engine land may be, when executing S106, derived by reading from the map the opening degree corresponding to the operating state of theinternal combustion engine 1 on this occasion. When terminating the process in S106, the present routine is finished for the meantime. - As discussed so far, the catalyst temperature increasing routine in the first embodiment is that if the temperature of the NOx catalyst in the exhaust
gas purifying device 10 is lower than the activation temperature, the flowrate control valve 11 d is fully closed, and the fuel is added into the exhaust gas from thefuel adding valve 12, thereby making it possible to ensure transportability enough for having the added fuel reached theoxidation catalyst 11 e. - Further, after the fuel has reached the
oxidation catalyst 11 e, theflowrate control valve 11 d is opened, and the exhaust gas from theinternal combustion engine 1 flows to both of theexternal pipe portion 11 c and theinternal pipe portion 11 b, whereby the fuel reaching theoxidation catalyst 11 e can be refrained from passing intact through theoxidation catalyst 11 e within the short period of time, and the exhaust gas the temperature of which has been increased by the reducing reaction in theoxidation catalyst 11 e can be supplied more surely to the exhaustgas purifying device 10. - Note that in the exhaust gas purifying system described above, if the operating state of the
internal combustion engine 1 is a decelerating state, after the fuel added from thefuel adding valve 12 has reached theoxidation catalyst 11 e, theflowrate control valve 11 d may be opened to a much larger opening degree, and an inflow quantity of the exhaust gas discharged from theinternal combustion engine 1 into theoxidation catalyst 11 e may thus be decreased to a greater degree. The operation being done so, the low-temperature exhaust gas in the decelerating state of theinternal combustion engine 1 can be refrained from flowing into theoxidation catalyst 11 e, and theoxidation catalyst 11 e can be also restrained from being cooled down. -
FIG. 3 shows an example of the exhaust gas purifying device temperature increasing routine in that case. A different point between the control in the present routine and the control inFIG. 2 is that in the present routine, after judging in S105 that the fuel reaches theoxidation catalyst 11 e, the operation proceeds to not S106 but S201. It is judged in S201 whether theinternal combustion engine 1 is in the decelerating state or not. To be specific, an output of an unillustrated accelerator position sensor is read into theECU 35, and it may be judged whether an accelerator tread-on quantity obtained from this value is zero or not. A state where the accelerator is not trodden on may be defined as the decelerating state. - When judging in S201 that the
internal combustion engine 1 is in the decelerating state, it is judged that if the flowrate control valve 11 d is opened to the predetermined opening degree, and the exhaust gas from theinternal combustion engine 1 is supplied to both of theinternal pipe portion 11 b and theexternal pipe portion 11 c containing theoxidation catalyst 11 e as explained inFIG. 2 , theoxidation catalyst 11 e is cooled down conversely. Hence, the operation proceeds to S107, wherein the flowrate control valve 11 d is fully opened. Whereas if it is judged in S201 that theinternal combustion engine 1 is not in the deceleration state, as described inFIG. 2 , the operation proceeds to S106. - If done so, even in the case the
internal combustion engine 1 is in the decelerating state and the reducing reaction occurs in theoxidation catalyst 11 e due to the fuel added from thefuel adding valve 12, it is feasible to restrain an occurrence of the situation that theoxidation catalyst 11 e is cooled down by the low-temperature exhaust gas. As a result, the exhaustgas purifying device 10 can be warmed up more surely. - It should be noted that in the first embodiment, when the
internal combustion engine 1 is judged to be in the decelerating state in S201, if theflowrate control valve 11 d is fully opened in S107, it follows that the low-temperature exhaust gas flows directly into the exhaustgas purifying device 10. In this case also, however, the exhaustgas purifying device 10 has a larger thermal capacity than theoxidation catalyst 11 e has, and hence such a problem, it is considered, is hard to occur that the exhaustgas purifying device 10 itself is cooled quickly down to the low temperature. - Moreover, other than what has been discussed above, after finishing the warm-up of the
internal combustion engine 1 in the first embodiment and when the exhaust gas purifying device temperature increasing routine is not executed, if theinternal combustion engine 1 gets into the decelerating state, such control may also be conducted that the flowrate control valve 11 d be fully opened. This control being thus conducted, after finishing the warm-up of theinternal combustion engine 1, it is possible to restrain the low-temperature exhaust gas from flowing into theoxidation catalyst 11 e reaching the activation temperature or higher and also to restrain theoxidation catalyst 11 e reaching at last the activation temperature or higher from being cooled down. - Next, a second embodiment of the present invention will be described. The second embodiment will exemplify another configuration of the exhaust gas
temperature increasing device 11 explained inFIG. 1 . -
FIG. 4 is a view showing an outline of the configuration of the exhaust gastemperature increasing device 11 in the second embodiment. A first mode of the second embodiment is that as illustrated inFIG. 4 (A), an exhaustgas purifying device 20 and an exhaust gastemperature increasing device 21 are substantially equalized in their diameters and are provided within a pipe having the same diameter. According to the first mode, the exhaust gas can be more smoothly flowed into the exhaustgas purifying device 20 without disturbing the flow of the exhaust gas discharged from the exhaust gastemperature increasing device 21. Further, especially when anoxidation catalyst 21 e is provided in anexternal pipe portion 21 c, the high-temperature exhaust gas discharged from theoxidation catalyst 21 e can be more surely flowed into the outer peripheral portion of the exhaustgas purifying device 20, with the result that the temperature of the exhaustgas purifying device 20 can be more certainly uniformly increased. Moreover, according to the first mode, a steppedportion 21 f inFIG. 4(A) is not positioned between the exhaust gastemperature increasing device 21 and the exhaustgas purifying device 20. It is therefore possible to restrain a large amount of heat from escaping outwardly of theexhaust pipe 5 because the exhaust gas discharged from theoxidation catalyst 21 e flows against the steppedportion 21 f. - Furthermore,
FIG. 4 (B) illustrates another mode of the second embodiment. InFIG. 4 (B), theoxidation catalyst 21 e is provided not in theexternal pipe portion 21 c but in aninternal pipe portion 21 b. With this arrangement, theoxidation catalyst 21 e does not abut on the external portion of theexhaust pipe 5, whereby the heat retaining property of theoxidation catalyst 21 e can be more enhanced. - Moreover, as shown in
FIG. 5 , such a mode may be taken that the exhaustgas purifying device 20 is partially inserted into theinternal pipe portion 21 b.FIG. 5(A) shows a state where the flowrate control valve 21 d is opened, whileFIG. 5(B) shows a state where the flowrate control valve 21 d is fully closed. According to the present mode, even when the exhaustgas purifying device 20 has a large capacity, the whole configuration including the exhaust gastemperature increasing device 21 and the exhaustgas purifying device 20 can be downsized, and the mountability on the vehicle can be improved. - Further,
FIG. 6 illustrates still another mode of the second embodiment. InFIG. 6(A) , an electro-thermic heater 21 g is provided in theoxidation catalyst 21 e. Then, when heating up the exhaustgas purifying device 20, to begin with, the electro-thermic heater 21 g is electrified to emit the heat, thereby increasing the temperature of theoxidation catalyst 21 e itself. When done so, it is feasible to increase the temperature of theoxidation catalyst 21 e itself over the activation temperature more surely and to raise the temperature of the exhaust gas flowing into the exhaustgas purifying device 20 more certainly. - Further, in
FIG. 6(B) , aglow plug 21 h is provided upstream immediately of theoxidation catalyst 21 e. Then, when heating up the exhaustgas purifying device 20, at first, theglow plug 21 h is electrified to emit the heat, the temperature of theoxidation catalyst 21 e itself is increased, and the temperature of the exhaust gas passing through theexternal pipe portion 21 c is raised. Then, the fuel is added from thefuel adding valve 12. With this operation, the temperature of theoxidation catalyst 21 e itself can be increased over the activation temperature with more of the certainty, and the temperature of the exhaust gas discharged from theoxidation catalyst 21 e can be further increased. Accordingly, the temperature of the exhaust gas flowing into the exhaustgas purifying device 20 can be raised more certainly. - It is to be noted that the embodiments discussed above have exemplified the case of warming up the exhaust
gas purifying device internal combustion engine 1. In addition, the configurations and the control in the embodiments discussed above may be applied to a case of increasing the temperature of the NOx catalyst or of the filter in a SOx poisoning recovery process and in the PM regenerating process of the filter in the exhaustgas purifying device - Further, the embodiments discussed above have exemplified the example of adding the fuel as the reducing agent from the
fuel adding valve 12, however, these embodiments may be applied to the exhaust gas purifying system that involves using urea water as the reducing agent. Moreover, these embodiments may also be applied to the exhaust gas purifying system of the internal combustion engine other than the diesel engine. In addition, these embodiments may also be applied to the exhaust gas purifying system adding the fuel as the reducing agent by executing the sub-injection such as VIGOM injection, POST injection, etc., from a fuel injection valve of the internal combustion engine. - Moreover, the configuration of the exhaust gas purifying system according to the present invention is not limited to the configurations in the embodiments discussed above and can be modified as far as these modifications are within the range of the technical idea of the present invention. For example, full-close state of the flow
rate control valve 11 d in the embodiments discussed above does not necessarily mean completely closed state of valve. It can include the state that the flowrate control valve 11 d is closed to a sufficiently small opening degree with which substantially an entire quantity of the exhaust gas from theinternal combustion engine 1 can flow into theoxidation catalyst 11 e. - According to the present invention, the temperature of the exhaust gas purifying device in the exhaust system of the internal combustion engine can be increased more efficiently or more surely with the much simpler configuration.
Claims (16)
1. An exhaust gas purifying system of an internal combustion engine, comprising:
an exhaust gas purifying device provided in an exhaust passageway of said internal combustion engine, purifying an exhaust gas passing through said exhaust passageway and with its temperature increased to a predetermined temperature or higher with the result that purifying capability thereof is improved;
exhaust gas temperature increasing unit provided on an upstream side of said exhaust gas purifying device in said exhaust passageway; and
reducing agent adding unit provided on the upstream side of said exhaust gas temperature increasing unit in said exhaust passageway and adding a reducing agent to the exhaust gas passing through said exhaust passageway,
wherein said exhaust gas temperature increasing unit includes:
an exhaust gas temperature increasing catalyst provided in a single exhaust pipe configuring said exhaust passageway so that an exhaust gas flow-through area trough which the exhaust gas should pass is left, supplied with the reducing agent added from said reducing agent adding unit and thereby emitting heat; and
an exhaust gas flow rate control device controlling, in the exhaust gas passing through said exhaust pipe, allocation of a quantity of the exhaust gas passing said exhaust gas flow-through area and a quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
2. An exhaust gas purifying system of an internal combustion engine according to claim 1 , wherein said exhaust gas flow-through area is disposed in a central portion in section perpendicular to an exhaust gas pass-through direction in said exhaust pipe, and
said exhaust gas temperature increasing catalyst is disposed outside of said exhaust gas flow-through area within the section.
3. An exhaust gas purifying system of an internal combustion engine according to claim 1 , wherein said exhaust gas flow rate control device is capable of selecting, by controlling the allocation, a state where substantially an entire quantity of the exhaust gas flowing through said exhaust pipe passes through said exhaust gas flow-through area, a state where substantially the entire quantity of the exhaust gas flowing through said exhaust pipe passes through said exhaust gas temperature increasing catalyst, and a state where the exhaust gas flowing through the exhaust pipe passes through both of said exhaust gas flow-through area and said exhaust gas temperature increasing catalyst.
4. An exhaust gas purifying system of an internal combustion engine according to claim 1 , wherein when increasing the temperature of said exhaust gas purifying device,
said reducing agent adding unit adds the reducing agent to the exhaust gas passing through said exhaust passageway, and said exhaust gas flow rate control device controls the allocation in order to make substantially the entire quantity of the exhaust gas flowing through said exhaust pipe pass through said exhaust gas temperature increasing catalyst, and
said exhaust gas flow rate control device, after the reducing agent added from said reducing agent adding unit has reached said exhaust gas temperature increasing catalyst, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
5. An exhaust gas purifying system of an internal combustion engine according to claim 1 , wherein said exhaust gas flow rate control device, during a decelerating operation of a vehicle mounted with said internal combustion engine, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
6. An exhaust gas purifying system of an internal combustion engine according to claim 2 , wherein said exhaust gas flow rate control device is capable of selecting, by controlling the allocation, a state where substantially an entire quantity of the exhaust gas flowing through said exhaust pipe passes through said exhaust gas flow-through area, a state where substantially the entire quantity of the exhaust gas flowing through said exhaust pipe passes through said exhaust gas temperature increasing catalyst, and a state where the exhaust gas flowing through the exhaust pipe passes through both of said exhaust gas flow-through area and said exhaust gas temperature increasing catalyst.
7. An exhaust gas purifying system of an internal combustion engine according to claim 2 , wherein when increasing the temperature of said exhaust gas purifying device,
said reducing agent adding unit adds the reducing agent to the exhaust gas passing through said exhaust passageway, and said exhaust gas flow rate control device controls the allocation in order to make substantially the entire quantity of the exhaust gas flowing through said exhaust pipe pass through said exhaust gas temperature increasing catalyst, and
said exhaust gas flow rate control device, after the reducing agent added from said reducing agent adding unit has reached said exhaust gas temperature increasing catalyst, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
8. An exhaust gas purifying system of an internal combustion engine according to claim 2 , wherein said exhaust gas flow rate control device, during a decelerating operation of a vehicle mounted with said internal combustion engine, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
9. An exhaust gas purifying system of an internal combustion engine according to claim 3 , wherein when increasing the temperature of said exhaust gas purifying device,
said reducing agent adding unit adds the reducing agent to the exhaust gas passing through said exhaust passageway, and said exhaust gas flow rate control device controls the allocation in order to make substantially the entire quantity of the exhaust gas flowing through said exhaust pipe pass through said exhaust gas temperature increasing catalyst, and
said exhaust gas flow rate control device, after the reducing agent added from said reducing agent adding unit has reached said exhaust gas temperature increasing catalyst, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
10. An exhaust gas purifying system of an internal combustion engine according to claim 3 , wherein said exhaust gas flow rate control device, during a decelerating operation of a vehicle mounted with said internal combustion engine, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
11. An exhaust gas purifying system of an internal combustion engine according to claim 4 , wherein said exhaust gas flow rate control device, during a decelerating operation of a vehicle mounted with said internal combustion engine, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
12. An exhaust gas purifying system of an internal combustion engine according to claim 6 , wherein when increasing the temperature of said exhaust gas purifying device,
said reducing agent adding unit adds the reducing agent to the exhaust gas passing through said exhaust passageway, and said exhaust gas flow rate control device controls the allocation in order to make substantially the entire quantity of the exhaust gas flowing through said exhaust pipe pass through said exhaust gas temperature increasing catalyst, and
said exhaust gas flow rate control device, after the reducing agent added from said reducing agent adding unit has reached said exhaust gas temperature increasing catalyst, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
13. An exhaust gas purifying system of an internal combustion engine according to claim 6 , wherein said exhaust gas flow rate control device, during a decelerating operation of a vehicle mounted with said internal combustion engine, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
14. An exhaust gas purifying system of an internal combustion engine according to claim 7 , wherein said exhaust gas flow rate control device, during a decelerating operation of a vehicle mounted with said internal combustion engine, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
15. An exhaust gas purifying system of an internal combustion engine according to claim 9 , wherein said exhaust gas flow rate control device, during a decelerating operation of a vehicle mounted with said internal combustion engine, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
16. An exhaust gas purifying system of an internal combustion engine according to claim 12 , wherein said exhaust gas flow rate control device, during a decelerating operation of a vehicle mounted with said internal combustion engine, controls the allocation in order to decrease, in the exhaust gas flowing through said exhaust pipe, the quantity of the exhaust gas passing through said exhaust gas temperature increasing catalyst.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005091485A JP2006274838A (en) | 2005-03-28 | 2005-03-28 | Exhaust gas purifying system of internal combustion engine |
JP2005-091485 | 2005-03-28 | ||
PCT/JP2006/307008 WO2006104240A1 (en) | 2005-03-28 | 2006-03-28 | Exhaust gas purifying system of internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080120966A1 true US20080120966A1 (en) | 2008-05-29 |
Family
ID=36569953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/795,338 Abandoned US20080120966A1 (en) | 2005-03-28 | 2006-03-28 | Exhaust Gas Purification System for Internal Combustion Engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US20080120966A1 (en) |
EP (1) | EP1864004A1 (en) |
JP (1) | JP2006274838A (en) |
CN (1) | CN101080557A (en) |
WO (1) | WO2006104240A1 (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090218409A1 (en) * | 2008-02-29 | 2009-09-03 | Wen-Lo Chen | Heating system for motor vehicle |
US20100037768A1 (en) * | 2008-08-12 | 2010-02-18 | Man Nutzfahrzeuge Ag | Method and device for the regeneration of a particle filter arranged in the exhaust gas tract of an internal combustion engine |
US20100041543A1 (en) * | 2008-08-12 | 2010-02-18 | Man Nutzfahrzeuge Ag | Method and Device for the Regeneration of a Particle Filter Arranged in the Exhaust Gas Train of an Internal Combustion Engine |
US20100037607A1 (en) * | 2008-08-12 | 2010-02-18 | Man Nutzfahrzeuge Ag | Method and device for the regeneration of a particle filter arranged in the exhaust gas tract of an internal combustion engine |
US20110011065A1 (en) * | 2008-05-30 | 2011-01-20 | Deutz Aktiengesellschaft | High-efficiency scr catalytic converter |
US20110041482A1 (en) * | 2009-08-20 | 2011-02-24 | Gm Global Technology Operations, Inc. | Method and apparatus for exhaust aftertreatment of an internal combustion engine |
US8484959B2 (en) | 2008-05-02 | 2013-07-16 | Toyota Jidosha Kabushiki Kaisha | Catalyst apparatus and exhaust gas purification system for internal combustion engine |
US20150027104A1 (en) * | 2012-01-09 | 2015-01-29 | Eminox Limited | Exhaust system and method for reducing particulate and no2 emissions |
US20150176454A1 (en) * | 2012-07-18 | 2015-06-25 | Caterpillar Motoren Gmbh & Co. Kg | Compact exhaust gas treatment system and method of operating the same |
CN106880989A (en) * | 2015-12-16 | 2017-06-23 | 重庆东宏鑫科技有限公司 | Discharge capacity adjustable type waste gas purification structure |
WO2019086161A1 (en) * | 2017-11-03 | 2019-05-09 | Robert Bosch Gmbh | Exhaust tract for an internal combustion engine, and method for operating an internal combustion engine |
US10641153B1 (en) | 2018-11-26 | 2020-05-05 | Tenneco Automotive Operating Company Inc. | Exhaust after-treatment system having an oxidation component bypass for low temperature SCR |
WO2020193595A1 (en) * | 2019-03-27 | 2020-10-01 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Exhaust emission control device, internal combustion engine equipped therewith and method for exhaust emission control |
US10876450B2 (en) * | 2019-05-22 | 2020-12-29 | FEV Europe GmbH | Splitflow catalyst system |
US20210164374A1 (en) * | 2019-12-03 | 2021-06-03 | Faurecia Emissions Control Technologies, Usa, Llc | Exhaust aftertreatment component with bypass valve |
DE102016001785B4 (en) | 2015-02-26 | 2023-10-26 | Ngk Spark Plug Co., Ltd. | Ammonia production device and ammonia production control device |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007154769A (en) * | 2005-12-06 | 2007-06-21 | Mitsubishi Fuso Truck & Bus Corp | Exhaust emission control device |
JP2009115064A (en) * | 2007-11-09 | 2009-05-28 | Toyota Industries Corp | Exhaust emission control device |
FR2925577A3 (en) * | 2007-12-21 | 2009-06-26 | Renault Sas | Exhaust gas depolluting device for exhaust line of internal combustion engine i.e. oil engine, has thermal stabilizer stabilizing temperature of exhaust gas and arranged in upstream of temperature sensor in exhaust line |
DE102009000101A1 (en) * | 2009-01-09 | 2010-07-15 | Robert Bosch Gmbh | tank design |
EP2305978B1 (en) * | 2009-09-23 | 2016-11-16 | MAN Truck & Bus AG | Method and device for regenerating a particulate filter built into the exhaust gas flow of a combustion engine |
JP2011117395A (en) * | 2009-12-04 | 2011-06-16 | Comotec Corp | Filter regeneration device for internal combustion engine |
SE536409C2 (en) * | 2011-01-25 | 2013-10-15 | Scania Cv Ab | Method for monitoring and adjusting an exhaust aftertreatment system and exhaust aftertreatment system therefore |
DE202011000703U1 (en) * | 2011-03-28 | 2012-07-03 | Hjs Emission Technology Gmbh & Co. Kg | Heating module for an emission control system |
DE102011001596A1 (en) * | 2011-03-28 | 2012-10-04 | Hjs Emission Technology Gmbh & Co. Kg | Method for supplying thermal energy into an exhaust gas purification unit switched on in the exhaust gas line of an internal combustion engine |
US10668414B2 (en) | 2014-07-23 | 2020-06-02 | Cummins Filtration Ip, Inc. | Intake bypass flow management systems and methods |
DE102017124080A1 (en) * | 2016-10-25 | 2017-11-30 | FEV Europe GmbH | Method for controlling an exhaust aftertreatment device of an internal combustion engine |
CN108201741A (en) * | 2016-12-17 | 2018-06-26 | 重庆市银盛模具有限公司 | Exhaust gas discharge structure |
JP2019132168A (en) * | 2018-01-30 | 2019-08-08 | トヨタ自動車株式会社 | Exhaust emission control device of internal combustion engine |
JP7206092B2 (en) * | 2018-10-23 | 2023-01-17 | 日本碍子株式会社 | Heating device, its manufacturing method, and system |
GB2615021A (en) * | 2020-10-22 | 2023-07-26 | Cummins Emission Solutions Inc | Exhaust gas aftertreatment system |
CN112696250B (en) * | 2020-12-16 | 2022-06-10 | 佛山职业技术学院 | Automobile exhaust fully-processing device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3791143A (en) * | 1971-11-10 | 1974-02-12 | Engelhard Min & Chem | Process and apparatus |
US20040139739A1 (en) * | 2002-11-25 | 2004-07-22 | Masao Kagenishi | Exhaust gas purifying apparatus and exhaust gas purifying method for an internal combustion engine |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4505106A (en) * | 1981-12-02 | 1985-03-19 | Robertshaw Controls Company | Exhaust system for an internal combustion engine, burn-off unit and methods therefor |
US4485621A (en) * | 1983-01-07 | 1984-12-04 | Cummins Engine Company, Inc. | System and method for reducing particulate emissions from internal combustion engines |
US4686827A (en) * | 1983-02-03 | 1987-08-18 | Ford Motor Company | Filtration system for diesel engine exhaust-II |
DE10024254A1 (en) | 2000-05-17 | 2001-12-06 | Bosch Gmbh Robert | Exhaust gas treatment device |
JP2004190554A (en) * | 2002-12-11 | 2004-07-08 | Aisin Takaoka Ltd | Exhaust emission control device of engine |
-
2005
- 2005-03-28 JP JP2005091485A patent/JP2006274838A/en active Pending
-
2006
- 2006-03-28 EP EP06730956A patent/EP1864004A1/en not_active Withdrawn
- 2006-03-28 CN CNA200680001358XA patent/CN101080557A/en active Pending
- 2006-03-28 WO PCT/JP2006/307008 patent/WO2006104240A1/en active Application Filing
- 2006-03-28 US US11/795,338 patent/US20080120966A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3791143A (en) * | 1971-11-10 | 1974-02-12 | Engelhard Min & Chem | Process and apparatus |
US20040139739A1 (en) * | 2002-11-25 | 2004-07-22 | Masao Kagenishi | Exhaust gas purifying apparatus and exhaust gas purifying method for an internal combustion engine |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090218409A1 (en) * | 2008-02-29 | 2009-09-03 | Wen-Lo Chen | Heating system for motor vehicle |
US8484959B2 (en) | 2008-05-02 | 2013-07-16 | Toyota Jidosha Kabushiki Kaisha | Catalyst apparatus and exhaust gas purification system for internal combustion engine |
US20110011065A1 (en) * | 2008-05-30 | 2011-01-20 | Deutz Aktiengesellschaft | High-efficiency scr catalytic converter |
US8484954B2 (en) * | 2008-05-30 | 2013-07-16 | Deutz Aktiengesellschaft | High-efficiency SCR catalytic converter |
US20100037768A1 (en) * | 2008-08-12 | 2010-02-18 | Man Nutzfahrzeuge Ag | Method and device for the regeneration of a particle filter arranged in the exhaust gas tract of an internal combustion engine |
US20100041543A1 (en) * | 2008-08-12 | 2010-02-18 | Man Nutzfahrzeuge Ag | Method and Device for the Regeneration of a Particle Filter Arranged in the Exhaust Gas Train of an Internal Combustion Engine |
US20100037607A1 (en) * | 2008-08-12 | 2010-02-18 | Man Nutzfahrzeuge Ag | Method and device for the regeneration of a particle filter arranged in the exhaust gas tract of an internal combustion engine |
CN101676529A (en) * | 2008-08-12 | 2010-03-24 | 德国曼商用车辆股份公司 | Method and device for regenerating a particulate filter built into the exhaust gas line of a combustion engine |
US8268273B2 (en) | 2008-08-12 | 2012-09-18 | Man Truck & Bus Ag | Method and device for the regeneration of a particle filter arranged in the exhaust gas train of an internal combustion engine |
US8404011B2 (en) * | 2008-08-12 | 2013-03-26 | Man Nutzfahrzeuge Ag | Method and device for the regeneration of a particle filter arranged in the exhaust gas tract of an internal combustion engine |
US8756927B2 (en) * | 2008-08-12 | 2014-06-24 | Man Truck & Bus Ag | Method and device for the regeneration of a particle filter arranged in the exhaust gas tract of an internal combustion engine |
US20110041482A1 (en) * | 2009-08-20 | 2011-02-24 | Gm Global Technology Operations, Inc. | Method and apparatus for exhaust aftertreatment of an internal combustion engine |
US20150027104A1 (en) * | 2012-01-09 | 2015-01-29 | Eminox Limited | Exhaust system and method for reducing particulate and no2 emissions |
US20150176454A1 (en) * | 2012-07-18 | 2015-06-25 | Caterpillar Motoren Gmbh & Co. Kg | Compact exhaust gas treatment system and method of operating the same |
US9903244B2 (en) * | 2012-07-18 | 2018-02-27 | Caterpillar Motoren Gmbh & Co. Kg | Compact exhaust gas treatment system and method of operating the same |
DE102016001785B4 (en) | 2015-02-26 | 2023-10-26 | Ngk Spark Plug Co., Ltd. | Ammonia production device and ammonia production control device |
CN106880989A (en) * | 2015-12-16 | 2017-06-23 | 重庆东宏鑫科技有限公司 | Discharge capacity adjustable type waste gas purification structure |
WO2019086161A1 (en) * | 2017-11-03 | 2019-05-09 | Robert Bosch Gmbh | Exhaust tract for an internal combustion engine, and method for operating an internal combustion engine |
US10641153B1 (en) | 2018-11-26 | 2020-05-05 | Tenneco Automotive Operating Company Inc. | Exhaust after-treatment system having an oxidation component bypass for low temperature SCR |
WO2020193595A1 (en) * | 2019-03-27 | 2020-10-01 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Exhaust emission control device, internal combustion engine equipped therewith and method for exhaust emission control |
US11952931B2 (en) | 2019-03-27 | 2024-04-09 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Exhaust emission control device, internal combustion engine equipped therewith and method for exhaust emission control |
US10876450B2 (en) * | 2019-05-22 | 2020-12-29 | FEV Europe GmbH | Splitflow catalyst system |
US20210164374A1 (en) * | 2019-12-03 | 2021-06-03 | Faurecia Emissions Control Technologies, Usa, Llc | Exhaust aftertreatment component with bypass valve |
US11268414B2 (en) * | 2019-12-03 | 2022-03-08 | Faurecia Emissions Control Technologies, Usa, Llc | Exhaust aftertreatment component with bypass valve |
Also Published As
Publication number | Publication date |
---|---|
EP1864004A1 (en) | 2007-12-12 |
JP2006274838A (en) | 2006-10-12 |
WO2006104240A1 (en) | 2006-10-05 |
CN101080557A (en) | 2007-11-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20080120966A1 (en) | Exhaust Gas Purification System for Internal Combustion Engine | |
US6823663B2 (en) | Exhaust gas aftertreatment systems | |
US6928806B2 (en) | Exhaust gas aftertreatment systems | |
US7987662B2 (en) | Composition and method for controlling excessive exhaust gas temperatures | |
US8516798B2 (en) | Methods and systems for control of an emission system with more than one SCR region | |
US10364716B2 (en) | Exhaust gas control apparatus for internal combustion engine and exhaust gas control method for internal combustion engine | |
US20090031711A1 (en) | Exhaust gas system, especially for an internal combustion engine of a motor vehicle | |
US20050091968A1 (en) | Exhaust gas aftertreatment systems | |
EP1898061A1 (en) | Exhaust gas purification system and method for internal combustion engine | |
US8371111B2 (en) | Exhaust gas purification system for internal combustion engine | |
JP2008196375A (en) | Exhaust emission control device of internal combustion engine | |
US10371037B2 (en) | Internal combustion engine with exhaust-gas aftertreatment system and method for operating an internal combustion engine of said type | |
US20100186378A1 (en) | Exhaust gas purification apparatus for internal combustion engine | |
JP4640145B2 (en) | Exhaust gas purification system for internal combustion engine | |
CN110603373B (en) | Method for controlling temperature of NOx control component and exhaust aftertreatment system | |
JP2010185434A (en) | Exhaust emission control device for internal combustion engine | |
CN110857669B (en) | Control device for internal combustion engine | |
JP2003232213A (en) | Internal combustion engine | |
JP2005330940A (en) | Exhaust emission control system for internal combustion engine | |
JP3695100B2 (en) | Exhaust gas purification device for internal combustion engine | |
JP2008157069A (en) | Exhaust emission control system of internal combustion engine | |
JP6288000B2 (en) | Exhaust gas purification system for internal combustion engine | |
JP2003206793A (en) | Internal combustion engine | |
JP2004316497A (en) | Internal combustion engine with combustion type heater | |
JP2009174502A (en) | Exhaust emission control system for internal combustion engine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TOYOTA JIDOSHA KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SUGIYAMA, KOUSEKI;ODA, TOMIHISA;REEL/FRAME:019592/0546 Effective date: 20070405 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |