US20070289289A1 - Exhaust emission purifier with additive feeder unit and pressurized air introducer unit - Google Patents

Exhaust emission purifier with additive feeder unit and pressurized air introducer unit Download PDF

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Publication number
US20070289289A1
US20070289289A1 US11/797,959 US79795907A US2007289289A1 US 20070289289 A1 US20070289289 A1 US 20070289289A1 US 79795907 A US79795907 A US 79795907A US 2007289289 A1 US2007289289 A1 US 2007289289A1
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Prior art keywords
unit
additive
air
exhaust
pressurized
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US11/797,959
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English (en)
Inventor
Akikazu Kojima
Syoichi Yokoyama
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Denso Corp
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Denso Corp
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Publication of US20070289289A1 publication Critical patent/US20070289289A1/en
Abandoned legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12Control of the pumps
    • F02B37/16Control of the pumps by bypassing charging air
    • F02B37/164Control of the pumps by bypassing charging air the bypassed air being used in an auxiliary apparatus, e.g. in an air turbine
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/023Exhaust 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
    • F01N3/025Exhaust 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
    • F01N3/0253Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/033Exhaust 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 in combination with other devices
    • F01N3/035Exhaust 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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0821Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/105General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106Auxiliary oxidation catalysts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/18Exhaust 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
    • F01N3/20Exhaust 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
    • F01N3/2066Selective catalytic reduction [SCR]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12Control of the pumps
    • F02B37/16Control of the pumps by bypassing charging air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/02Adding substances to exhaust gases the substance being ammonia or urea
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/03Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/08Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Definitions

  • the following relates generally to an exhaust emission purifier and, more specifically, to an exhaust emission purifier with an additive feeder unit and a pressurized air introducer unit.
  • an internal combustion engine such as a diesel engine with a purification unit such as a diesel particulate filter (hereinafter referred to as “DPF”) and a NOx reduction catalyst.
  • the purification unit feeds fuel, urea, or the like as an additive in order to regenerate the purification unit or to trigger a catalytic oxidation-reduction reaction.
  • Examples of this purification device are disclosed in JP-2004-011463A and JP-2004-308526A.
  • the additive is ejected into the exhaust gases flowing in the exhaust system to be delivered to the purification unit.
  • the additive is fed in a fine spray form for promotion of the regeneration and the reaction in the purification unit.
  • the additive is fed using high-pressure air from the additive feeder so that the atomization of the additive is promoted.
  • larger vehicles such as trucks include a high-pressure air supply source such as a mechanical compressor which is structured independently of the internal combustion engine.
  • a high-pressure air supply source such as a mechanical compressor which is structured independently of the internal combustion engine.
  • smaller vehicles such as a passenger car, there may not be enough space to accommodate the high-pressure air supply source.
  • An exhaust emission purifier includes a purification unit provided in an exhaust system of an internal combustion engine for purifying exhaust gases flowing in the exhaust system.
  • the exhaust emission purifier also includes an additive feeder unit operatively coupled to the exhaust system at a position between the internal combustion engine and the purification unit for providing an additive to the exhaust gases flowing in the exhaust system.
  • the exhaust emission purifier includes a pressurized air introducer unit for receiving air pressurized by an air compressor unit, which is driven by the exhaust gases flowing in the exhaust system and compresses intake air flowing in an intake system of the internal combustion engine.
  • the pressurized air introducer unit is operatively coupled to the additive feeder unit for providing the air pressurized by the air compressor unit to the additive feeder unit.
  • An additive feeder for providing an additive to a purification unit of an exhaust system of an internal combustion engine.
  • the additive feeder included an additive injection valve operatively coupled to the exhaust system at a position between the internal combustion engine and the purification unit.
  • the additive injection valve injects the additive into exhaust gases flowing in the exhaust system.
  • a pressurized air introducer unit is further included for receiving air pressurized by an air compressor unit, which is driven by the exhaust gases flowing in the exhaust system and compresses intake air flowing in an intake system of the internal combustion engine.
  • the pressurized air introducer unit is operatively coupled to the additive injection valve for providing the air pressurized by the air compressor unit to the additive injection valve.
  • An exhaust purification system for an internal combustion engine that includes a purification unit provided in an exhaust system of an internal combustion engine for purifying exhaust gases flowing in the exhaust system.
  • the exhaust purification system also includes an additive feeder unit operatively coupled to the exhaust system at a position between the internal combustion engine and the purification unit for providing an additive to the exhaust gases flowing in the exhaust system.
  • an air compressor unit is included with a turbine provided in the exhaust system and driven by the exhaust gases flowing in the exhaust system.
  • the air compressor unit further includes a compressor provided in an intake system of the internal combustion engine and driven by the turbine. The compressor pressurizes intake air flowing in the intake system.
  • the exhaust purification system includes a pressurized air introducer unit for receiving air pressurized by the air compressor unit and is operatively coupled to the additive feeder unit for providing the air pressurized by the air compressor unit to the additive feeder unit.
  • FIG. 1 is a schematic diagram illustrating an exhaust purification system according to a first embodiment
  • FIG. 2 is a graph showing the relationship between the pressure of air supplied to an additive injection valve and the drop-diameter of a droplet of the injected additive;
  • FIG. 3 is a schematic diagram illustrating an exhaust purification system according to a second embodiment
  • FIG. 4 is a graph illustrating the relationship between the boost pressure, and the engine rotational speed and output torque
  • FIG. 5A is a graph showing the change in the amount of absorption of NOx absorbed in the NOx reduction catalyst during the engine operation period
  • FIG. 5B is a graph showing the change in boost pressure during the engine operation period and the change in supply pressure of the air supplied to the additive injection valve;
  • FIG. 6 is a schematic diagram illustrating an exhaust purification system according to a third embodiment.
  • FIG. 7 is a schematic diagram illustrating an exhaust purification system according to a fourth embodiment.
  • FIG. 1 is an exhaust purification system for an internal combustion engine to which an exhaust emission purifier according to a first embodiment is applied.
  • the exhaust purification system 10 of the first embodiment purifies the exhaust gases emitted from a diesel engine 11 (hereinafter referred to as “engine”) serving as an internal combustion engine.
  • the exhaust purification system 10 is equipped with a purification unit 20 , an additive feeder unit ( 32 ), an air compressor unit (e.g., a turbocharger 40 ), and a pressurized air introducer unit 50 .
  • the engine 11 includes an exhaust system 60 and an intake system 70 .
  • the exhaust system 60 guides exhaust gases from the engine 11 to an area outside of the engine 11 .
  • the exhaust system 60 has an exhaust pipe 61 that forms an exhaust passage 62 .
  • the exhaust gases emitted from the engine 11 flow through the exhaust passage 62 to the outside.
  • the exhaust passage 62 defined by the exhaust pipe 61 is fluidly coupled to the engine 11 and an exhaust port 63 .
  • the purification unit 20 provided in the exhaust system and is operatively coupled to the exhaust pipe 61 .
  • the purification unit 20 is disposed between the engine 11 and the exhaust port 63 in the exhaust system 60 .
  • the intake system 70 supplies intake air to the engine 11 from an area outside the engine 11 .
  • the intake system 70 has an intake pipe 71 that defines an intake passage 72 .
  • the intake air introduced from an intake port 73 flows through an intake passage 72 into the engine 11 .
  • the intake passage 72 defined by the intake pipe 71 is fluidly coupled to the intake port 73 and the engine 11 .
  • a throttle 74 is disposed in the intake passage 72 for adjusting a flow rate of the intake air.
  • the purification unit 20 is disposed in the exhaust system 60 .
  • the purification unit 20 has a DPE 21 , a NOx reduction catalyst 22 and an oxidation catalyst 23 .
  • the DPE 21 collects particulate matter (PM) included in the exhaust gases.
  • the NOx reduction catalyst 22 reduces NOx included in the exhaust gases in cooperation with, for example, fuel, such as light oil, and urea as the additive. As a result, the NOx included in the exhaust gases is reduced to N 2 , CO 2 , and H 2 O which are less harmful.
  • the oxidation catalyst 23 oxidizes PM included in the exhaust gases.
  • the first embodiment describes an example of the purification unit 20 provided with the DPF 21 , the NOx reduction catalyst 22 and the oxidation catalyst 23 .
  • any suitable purification unit 20 may be provided.
  • the NOx reduction catalyst 22 and either the DPF 21 or the oxidation catalyst 23 is provided.
  • the purification unit 20 is provided with a filter and a catalyst in place of the DPF 21 , the NOx reduction catalyst 22 , or the oxidation catalyst 23 which are exemplified above.
  • the additive feeder unit 32 is operatively coupled to the exhaust system 60 at a position between the engine 11 and the purification unit 20 for providing an additive to the exhaust gases flowing in the exhaust system 60 .
  • the additive feeder unit 32 includes an additive injection valve 30 that is in fluid communication with the exhaust system 60 between the engine 11 and the purification unit 20 .
  • the injection valve 30 is closer to the engine 11 than the distance between the purification unit 20 and the engine 11 .
  • air from the pressurized air introducer unit 50 allows the injection valve 30 to feed additive into the exhaust system 60 .
  • the additive injection valve 30 injects the additive into the exhaust gases flowing in the exhaust passage 62 .
  • the additive comprises substances performing the functions of the DPF 21 , the NOx reduction catalyst 22 and the oxidation catalyst 23 of the purification unit 20 .
  • the DPF 21 collects the PM included in the exhaust gases. Therefore, when the DPF 21 collects more than a predetermined amount of PM, the DPF 21 can become clogged, resulting in a reduction in function of the DPF 21 .
  • the additive injection valve 30 injects, for example, fuel such as light oil as the additive, to burn off the PM collected by the DPF 21 . As a result, the clogging of the DPF 21 is reduced, so that the DPF 21 is regenerated.
  • the NOx reduction catalyst 22 absorbs the NOx included in the exhaust gases. Therefore, when the NOx reduction catalyst 22 absorbs more than a predetermined amount of NOx, the absorption capacity is saturated, resulting in a reduction in function of the NOx reduction catalyst 22 .
  • the additive injection valve 30 injects, for example, fuel such as light oil or urea which is an additive serving as a reducer, to thereby reduce the NOx absorbed in the NOx reduction catalyst 22 . As a result, the NOx reduction catalyst 22 is regenerated.
  • the oxidation catalyst 23 burns off the PM included in the exhaust gases. Therefore, fuel is required to burn off the PM.
  • the additive injection valve 30 injects, for example, fuel such as light oil as the additive, so that the PM is burned off in the oxidation catalyst 23 .
  • the PM included in the exhaust gases burns, resulting in a reduction in exhaust emission to the outside.
  • the additive injection vale 30 injects light oil which is the fuel for the engine 11 , urea and/or the like as the additive as described above into the exhaust gases flowing in the exhaust passage 62 .
  • the additive injection valve 30 is connected to an additive tank 31 such as a fuel tank. The additive is supplied from the additive tank 31 to the additive injection valve 30 .
  • the turbocharger 40 has a turbine 41 disposed in the exhaust system 60 , and a compressor 42 disposed in the intake system 70 .
  • the turbine 41 is disposed in the exhaust passage 62 between the engine 11 and the additive injection valve 30 . In other words, the turbine 41 is closer to the engine 11 than the distance between the injection valve 30 and the engine 11 .
  • the compressor 42 is disposed in the intake passage 72 between the intake port 73 and the throttle 74 . In other words, the compressor 42 is closer to the intake port 73 than the distance between the intake port 73 and the throttle 74 .
  • the turbine 41 is rotatably driven by the high-pressure exhaust gases flowing in the exhaust passage 62 .
  • the turbine 41 and the compressor 42 are rotatably coupled to each other by a shaft 43 . For this reason, when the turbine 41 is driven by the flow of the exhaust gases, the compressor 42 is rotated together with the turbine 41 . This allows the compressor 42 to pressurize and transport the air flowing in the intake passage 72 toward the engine 11 . As a result, the intake air is compressed and sent to the engine 11 .
  • the pressurized air introducer 50 is fluidly and operatively coupled to the intake system 70 and the additive injection valve 30 .
  • One end of the pressurized air introducer 50 is fluidly coupled to the intake system 70 at a position between the engine 11 and the compressor 42 . In other words, this end of the pressurized air introducer 50 is closer to the engine 11 than the distance between the compressor 42 and the engine 11 .
  • the other end of the pressurized air introducer 50 is fluidly coupled to the additive injection valve 30 , which injects the additive into the exhaust passage 62 .
  • the compressor 42 pressurizes air in the intake passage 72
  • the pressurized air introducer 50 receives at least a portion of the air pressurized by the compressor 42
  • the pressurized air introducer 50 delivers the pressurized air to the additive injection valve 30 .
  • the additive injection valve 30 injects the additive into the exhaust system 50 along with the high-pressure air introduced from the pressurized air introducer 50 .
  • the additive ejected from the additive injection valve 30 is formed into a fine spray at least partly due to injection of the high-pressure air introduced from the pressurized air introducer 50 .
  • the additive ejected from the additive injection valve 30 has preferably a smaller drop-diameter, in order for the additive to promote the regeneration of and the burning in the purification unit 20 so that the purification unit 20 can perform its function.
  • the additive ejected from the additive injection valve 30 after forming into the fine spray, has droplets which become smaller in drop-diameter with the increase in the pressure of the air injected together with the additive from the additive injection valve 30 .
  • the ejection of the additive along with the high-pressure air decreases the drop-diameter of the droplets of the ejected additive.
  • the regeneration of and the burning in the purification unit 20 is promoted to enable the purification unit 20 to perform its function more effectively.
  • the high-pressure air can be provided to the injection valve 30 even without an additional high-pressure air supply source, such as a mechanical compressor, for example.
  • an additional high-pressure air supply source such as a mechanical compressor, for example.
  • FIG. 3 illustrates an exhaust purification system according to a second embodiment.
  • the pressurized air introducer 50 of the exhaust purification system 10 has a check valve 51 .
  • the check valve 51 is disposed at the end of the pressurized air introducer 50 adjacent to the intake system 70 .
  • the check valve 51 permits the flow of air through the pressurized air introducer 50 from the intake passage 72 to the additive injection valve 30 .
  • the check valve 51 blocks the flow of air through the pressurized air introducer 50 from the additive injection valve 30 generally toward the intake passage 72 .
  • the check valve 51 opens when the pressure in the intake passage 72 exceeds the pressure in the pressurized air introducer 50 adjacent the additive injection valve 30 and closes when the pressure in the intake passage 72 is lower than the pressure in the pressurized air introducer 50 adjacent the additive injection valve 30 .
  • the check valve 51 is preferably disposed closer to a boost-pressure inlet port of the piping connecting between the additive injection valve 30 and the intake passage 72 .
  • the check valve 51 is provided in a position as close as possible to the intake passage 72 , so as to increase the volume for storing the high-pressure air as much as possible.
  • the boost pressure produced by the turbocharger 40 is varied by the rotational speed and the output torque of the engine 11 .
  • the higher the rotational speed of the engine 11 and the greater the output torque the higher the boost pressure produced by the turbocharger 40 .
  • the operation conditions of the engine 11 that is, the rotational speed and the output torque, vary every moment. Because of this, as shown in FIG. 5B , the boost pressure also varies every moment in accordance with the operation conditions of the engine 11 .
  • the regeneration of the NOx reduction catalyst 22 is started at the time when the amount of stored NOx, which increases with increased operation time of the engine 11 , reaches a predetermined upper limit value M as shown in FIG. 5A .
  • the boost pressure is reduced by the operation conditions of the engine 11 as shown by the broken line in FIG. 5B , the pressure of the air which is to be ejected together with the additive from the additive injection valve 30 may be possibly reduced.
  • the check valve 51 is provided. As a result, even when the boost pressure varies as shown by the broken line in FIG. 5B , the pressure in the pressurized air introducer 50 , that is, the pressure supplied to the additive injection valve 30 , is at the maximum value of the boost pressure as shown by the solid line in FIG. 5B . In other words, the maximum boost pressure which is produced from the time of the last injection of the additive to the time of the current injection of the additive is maintained as the supply pressure of the pressurized air in the pressurized air introducer 50 .
  • the pressure of the air supplied from the pressurized air introducer 50 to the additive injection valve 30 is maintained at the maximum value produced in the intake passage 72 until the injection of the additive. This makes possible the constant supply of the high-pressure air to the additive injection valve 30 irrespective of the operation conditions of the engine 11 , thus promoting the spray formation of the additive injected.
  • the check valve 51 may be placed in any position in the pressurized air between the intake passage 72 and the additive injection valve 30 . However, if the check valve 51 is disposed at the end of the pressurize air introducer 50 adjoining the intake passage 72 , the volume of the pressurized air introducer 50 is increased, thus increasing the capacity of the high-pressure air.
  • the second embodiment has described the case when the NOx reduction catalyst 22 is regenerated, as an example, but likewise, the DPF 21 is regenerated when the amount of PM collected reaches a predetermined amount.
  • FIG. 6 illustrates an exhaust purification system according to a third embodiment.
  • the pressurized air introducer 50 of the purification system 10 includes a reservoir 52 .
  • the reservoir 52 is disposed between the intake system 70 and the additive injection valve 30 . More specifically, the reservoir 52 is disposed between the check valve 51 and the additive injection valve 30 .
  • the reservoir 52 has a greater axial cross sectional area than the other portions of the pressurized air introducer 50 .
  • the reservoir 52 is an air capacity portion for storing the air introduced into the pressurized air introducer 50 . That is, the reservoir 52 stores the high-pressure air introduced into the pressurized air introducer 50 .
  • the high-pressure air is ejected along with the additive from the additive injection valve 30 for exerting the function of the purification unit 20 , it is preferable that the high-pressure air is supplied continuously in accordance with the additive injection period.
  • the reservoir 52 is provided for increasing the volume of the pressurized air introducer 50 .
  • the high-pressure air introduced from the intake passage 72 is stored in the reservoir 52 in addition to the pressurized air introducer 50 .
  • the high-pressure air stored in the reservoir 52 is supplied when the additive is ejected, to thereby continuously promote the atomization of the additive irrespective of the operation conditions of the engine 11 .
  • FIG. 7 illustrates an exhaust purification system according to a fourth embodiment.
  • the pressurized air introducer 50 of the exhaust purification system 10 has a flow-rate control unit 53 .
  • the flow-rate control unit 53 blocks flow from the intake system 70 to the additive injection valve 30 when the rate of flow in the pressurized air introducer 50 exceeds a predetermined value.
  • the flow-rate control unit 53 blocks introduction of the high-pressure air into the pressurized air introducer 50 when the flow rate of air supplied from the intake passage 72 to the pressurized air introducer 50 exceeds a predetermined value.
  • the flow-rate control unit 53 is a flow limiter for controlling the flow rate of intake air from the intake passage 72 to the pressurized air introducer 50 .
  • the pressurized air introducer 50 is damaged and an air leak occurs in the pressurized air introducer 50 , the air introduced from the intake passage 72 is emitted from the pressurized air introducer 50 to the outside. For this reason, the intake air pressurized by the turbocharger 40 is not supplied to the engine 11 , resulting in a reduction in boost pressure of the turbocharger 40 . As a result, the engine 11 is unlikely to achieve a predetermined output.

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  • 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)
  • Materials Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
US11/797,959 2006-06-16 2007-05-09 Exhaust emission purifier with additive feeder unit and pressurized air introducer unit Abandoned US20070289289A1 (en)

Applications Claiming Priority (2)

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JP2006-167126 2006-06-16
JP2006167126A JP4280934B2 (ja) 2006-06-16 2006-06-16 排気浄化装置、添加剤供給装置および内燃機関の排気浄化システム

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US (1) US20070289289A1 (de)
JP (1) JP4280934B2 (de)
DE (1) DE102007000333B4 (de)
FR (1) FR2902456B1 (de)

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US20090260346A1 (en) * 2008-04-22 2009-10-22 Ioannis Gekas Method for purification of an exhaust gas from a diesel engine
US20100132341A1 (en) * 2008-12-02 2010-06-03 Caterpillar Inc. Power system
US20110023482A1 (en) * 2009-07-30 2011-02-03 Ford Global Technologies, Llc Egr extraction immediately downstream pre-turbo catalyst
US20110041815A1 (en) * 2007-02-05 2011-02-24 Volvo Lastvagnar Ab Exhaust purification system with a diesel particulate filter and a method of cleaning said filter
US20110232267A1 (en) * 2008-12-17 2011-09-29 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Method and device for the addition in droplet form of a liquid reducing agent into an exhaust gas line
US20130111880A1 (en) * 2010-06-21 2013-05-09 Andreas Liljestrand Method and device pertaining to cooling of dosing units of hc dosing systems for exhaust cleaning
US20130118153A1 (en) * 2010-06-21 2013-05-16 Andreas Liljestrand Method and device pertaining to cooling of dosing units of scr systems
US9200557B2 (en) 2010-06-21 2015-12-01 Scania Cv Ab Method pertaining to air removal from a dosing system at an SCR system and a SCR system
CH711661A1 (de) * 2015-10-15 2017-04-28 Liebherr Machines Bulle Sa Vorrichtung zur Abgasnachbehandlung.
CN109386349A (zh) * 2017-08-09 2019-02-26 北京福田康明斯发动机有限公司 内燃机用再生系统以及内燃机

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JP5141473B2 (ja) * 2008-09-26 2013-02-13 いすゞ自動車株式会社 排気ガス浄化システム及び排気ガス浄化方法
DE102008049807A1 (de) * 2008-09-30 2010-04-01 Man Nutzfahrzeuge Ag Vorrichtung und Verfahren zur Eindüsung von Kraftstoff in den Abgasstrang einer Brennkraftmaschine, insbesondere zur Regeneration eines Partikelfilters
DE102009027823A1 (de) 2009-07-20 2011-01-27 Robert Bosch Gmbh Vorrichtung zum Nachbehandeln von Abgasen einer Brennkraftmaschine
DE102009027824A1 (de) 2009-07-20 2011-01-27 Robert Bosch Gmbh Vorrichtung zum Nachbehandeln von Abgasen einer Brennkraftmaschine
DE102013002999A1 (de) * 2013-02-22 2014-08-28 Man Diesel & Turbo Se Brennkraftrnaschine
DE102015005051A1 (de) * 2015-04-21 2016-10-27 Man Diesel & Turbo Se System zur Eindüsung von Harnstoff in einen Abgasstrang
CN107178404A (zh) * 2017-07-24 2017-09-19 深圳市贝斯特净化设备有限公司 尾气净化装置
JP2019199862A (ja) * 2018-05-18 2019-11-21 愛三工業株式会社 空気供給システム、吸排気システム及び吸排気システムの制御装置

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US8499556B2 (en) * 2007-02-05 2013-08-06 Volvo Lastvagnar Ab Exhaust purification system with a diesel particulate filter and a method of cleaning said filter
US20110041815A1 (en) * 2007-02-05 2011-02-24 Volvo Lastvagnar Ab Exhaust purification system with a diesel particulate filter and a method of cleaning said filter
EP2112341A2 (de) 2008-04-22 2009-10-28 Haldor Topsoe A/S Verfahren zum Reinigen des Abgases eines Dieselmotors
US20090260346A1 (en) * 2008-04-22 2009-10-22 Ioannis Gekas Method for purification of an exhaust gas from a diesel engine
US20100132341A1 (en) * 2008-12-02 2010-06-03 Caterpillar Inc. Power system
US9194272B2 (en) 2008-12-02 2015-11-24 Caterpillar Inc. Power system
US20110232267A1 (en) * 2008-12-17 2011-09-29 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Method and device for the addition in droplet form of a liquid reducing agent into an exhaust gas line
US20110023482A1 (en) * 2009-07-30 2011-02-03 Ford Global Technologies, Llc Egr extraction immediately downstream pre-turbo catalyst
US8250866B2 (en) * 2009-07-30 2012-08-28 Ford Global Technologies, Llc EGR extraction immediately downstream pre-turbo catalyst
US20130118153A1 (en) * 2010-06-21 2013-05-16 Andreas Liljestrand Method and device pertaining to cooling of dosing units of scr systems
US20130111880A1 (en) * 2010-06-21 2013-05-09 Andreas Liljestrand Method and device pertaining to cooling of dosing units of hc dosing systems for exhaust cleaning
US9200557B2 (en) 2010-06-21 2015-12-01 Scania Cv Ab Method pertaining to air removal from a dosing system at an SCR system and a SCR system
US9523299B2 (en) * 2010-06-21 2016-12-20 Scania Cv Ab Method and device pertaining to cooling of dosing units of SCR systems
US9624807B2 (en) 2010-06-21 2017-04-18 Scania Cv Ab Method pertaining to air removal from a liquid supply system and a liquid supply system
CH711661A1 (de) * 2015-10-15 2017-04-28 Liebherr Machines Bulle Sa Vorrichtung zur Abgasnachbehandlung.
CN109386349A (zh) * 2017-08-09 2019-02-26 北京福田康明斯发动机有限公司 内燃机用再生系统以及内燃机

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Publication number Publication date
JP4280934B2 (ja) 2009-06-17
FR2902456A1 (fr) 2007-12-21
JP2007332901A (ja) 2007-12-27
DE102007000333A1 (de) 2007-12-20
FR2902456B1 (fr) 2013-08-16
DE102007000333B4 (de) 2014-02-20

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