WO2020137739A1 - エンジンの排気浄化システム - Google Patents

エンジンの排気浄化システム Download PDF

Info

Publication number
WO2020137739A1
WO2020137739A1 PCT/JP2019/049590 JP2019049590W WO2020137739A1 WO 2020137739 A1 WO2020137739 A1 WO 2020137739A1 JP 2019049590 W JP2019049590 W JP 2019049590W WO 2020137739 A1 WO2020137739 A1 WO 2020137739A1
Authority
WO
WIPO (PCT)
Prior art keywords
spray
injection
exhaust
control unit
reducing agent
Prior art date
Application number
PCT/JP2019/049590
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
賢吾 古川
勇介 本江
Original Assignee
株式会社デンソー
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2020137739A1 publication Critical patent/WO2020137739A1/ja

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors

Definitions

  • the present disclosure relates to an engine exhaust purification system.
  • Exhaust gas purification systems that reduce and purify predetermined components contained in engine exhaust have been known.
  • the exhaust gas purification system disclosed in Patent Document 1 injects and supplies a reducing agent or its precursor (hereinafter referred to as a reducing agent) to the upstream side of a catalyst, and the catalyst reduces and purifies NOx in exhaust gas. Further, the exhaust gas purification system reduces the flow rate of addition of the reducing agent or the like when the temperature of the exhaust passage wall surface between the injection nozzle and the catalyst is lower than a predetermined temperature. This suppresses the generation of deposits (hereinafter referred to as deposits) of components such as the reducing agent.
  • deposits deposits
  • the present disclosure has been made in view of the above points, and an object thereof is to provide an exhaust gas purification system that can suppress the generation of deposits without reducing the supply amount of reducing agents and the like.
  • An engine exhaust purification system of the present disclosure includes a catalyst that reduces and purifies a predetermined component in engine exhaust, and a supply amount calculation unit that calculates a required supply amount of a reducing agent or a precursor thereof according to an operating state of the engine, An injection device that supplies a liquid of a reducing agent or its precursor as a spray, and a spray speed control unit that can control the speed of the spray in the exhaust flow direction are provided.
  • the spray speed control unit slows the speed of the spray in the exhaust flow direction as it is determined that the deposit is likely to occur based on the operating state of the engine.
  • FIG. 1 is a schematic diagram showing an exhaust purification system of the first embodiment and an engine to which the exhaust purification system is applied
  • FIG. 2 is a diagram showing a necessary supply amount calculation map
  • FIG. 3 is a diagram showing the relationship between the required spray flow velocity and the injection pressure
  • FIG. 4 is a diagram showing a spray flow velocity calculation map
  • FIG. 5 is a diagram showing a correction coefficient calculation map
  • FIG. 6 is a flowchart explaining the processing executed by the control unit
  • FIG. 7 is a sub-flowchart explaining the processing executed by the control unit
  • FIG. 1 is a schematic diagram showing an exhaust purification system of the first embodiment and an engine to which the exhaust purification system is applied
  • FIG. 2 is a diagram showing a necessary supply amount calculation map
  • FIG. 3 is a diagram showing the relationship between the required spray flow velocity and the injection pressure
  • FIG. 4 is a diagram showing a spray flow velocity calculation map
  • FIG. 5 is a diagram showing a correction coefficient calculation map
  • FIG. 6 is a
  • FIG. 8 is a schematic diagram showing an exhaust purification system of the second embodiment and an engine to which the same is applied
  • FIG. 9 is a diagram showing the relationship between the injection time and the injection speed
  • FIG. 10 is a sub-flowchart illustrating the processing executed by the control unit
  • FIG. 11 is a diagram showing the relationship between the required spray flow velocity and the injection time
  • FIG. 12 is a diagram showing the relationship between the valve opening time and the injection amount per injection
  • FIG. 13 is a schematic diagram showing an exhaust purification system of the third embodiment and an engine to which the exhaust purification system is applied
  • FIG. 14 is a diagram showing the relationship between the required spray flow velocity and the injection pressure
  • FIG. 14 is a diagram showing the relationship between the required spray flow velocity and the injection pressure
  • FIG. 15 is a schematic diagram showing an exhaust purification system of the fourth embodiment and an engine to which the exhaust purification system is applied
  • FIG. 16 is a diagram showing the relationship between the required spray flow rate and the valve lift amount
  • FIG. 17 is a diagram showing the relationship between the required spray flow rate and the injection pressure
  • FIG. 18 is a sub-flowchart illustrating the processing executed by the control unit
  • FIG. 19 is a schematic diagram showing an exhaust purification system of the fifth embodiment and an engine to which the exhaust purification system is applied
  • FIG. 20 is a diagram showing a gas ejection velocity calculation map
  • FIG. 21 is a flowchart for explaining the processing executed by the control unit
  • FIG. 22 is a diagram showing the relationship between the engine speed, the accelerator opening, and the required supply amount used by the control unit in another embodiment.
  • FIG. 23 is a diagram showing the relationship between the required spray flow rate and the injection time used by the control unit in another embodiment
  • FIG. 24 is a diagram showing the relationship between the exhaust gas temperature and the required spray flow rate used by the control unit in another embodiment.
  • the exhaust gas purification system of the first embodiment is applied to the engine 90 shown in FIG.
  • the exhaust gas purification system 10 includes a catalyst 11, a mixer 12, an injection device 13, and a control unit 14.
  • the catalyst 11 is provided in the middle of the exhaust passage 91 of the engine 90, and reduces and purifies a predetermined component in the exhaust.
  • the catalyst 11 selectively reacts urea water as a reducing agent with nitrogen oxides (hereinafter, NOx) in exhaust gas to decompose NOx into nitrogen gas N 2 or the like to render it harmless. With function.
  • NOx nitrogen oxides
  • the mixer 12 is provided upstream of the catalyst 11 in the exhaust passage 91, and mixes the reducing agent and the exhaust by stirring.
  • the reducing agent is supplied to the mixer 12 in a mist state (that is, spray), a gas state, or a mixed state thereof.
  • the injection device 13 includes a tank 16 that stores urea water, a pump 17 that pumps the urea water in the tank 16, and a reducing agent injection valve 18 that supplies the urea water that is pumped from the pump 17 into the exhaust passage 91 as a spray. Have.
  • the reducing agent injection valve 18 is provided upstream of the mixer 12 in the exhaust passage 91.
  • the control unit 14 is the control unit of the engine 90 as well as the control unit of the exhaust gas purification system 10.
  • the control unit 14 is connected to sensors such as an accelerator opening sensor 93, an engine speed sensor 94, an intake air amount sensor 95, an exhaust gas amount sensor 96, an exhaust gas temperature sensor 97, a NOx concentration sensor 98, and other control units (not shown). Has been done.
  • the control unit 14 executes a program process based on a detection signal of each sensor or the like to control driving of the fuel addition valve 92, the pump 17, the reducing agent injection valve 18, and the like.
  • the exhaust gas sensor 96, the exhaust gas temperature sensor 97, and the NOx concentration sensor 98 are installed immediately downstream of the engine 90, but the invention is not limited to this, and they may be installed immediately upstream of the catalyst 11.
  • control unit 14 includes an information acquisition unit 21, a temperature determination unit 22, a supply amount calculation unit 23, and a spray speed control unit 24.
  • the information acquisition unit 21 acquires various information such as exhaust flow rate, exhaust temperature, and NOx concentration from detection signals of various sensors.
  • the temperature determination unit 22 determines whether or not the exhaust temperature has reached “the temperature at which the NOx purification reaction occurs in the catalyst 11” and “the temperature at which urea water is vaporized”. That is, it is determined whether the exhaust temperature is equal to or higher than the threshold value Tx. If the exhaust temperature is not equal to or higher than the threshold value Tx, purification cannot be performed and a deposit of a component such as a reducing agent (hereinafter referred to as a deposit) is generated, so that the injection device 13 does not inject the urea water.
  • a deposit a deposit of a component such as a reducing agent
  • the supply amount calculation unit 23 calculates the supply amount of urea water required for purifying NOx by the catalyst 11 (hereinafter, required supply amount) according to the operating state of the engine 90.
  • the exhaust flow rate, the exhaust temperature, and the NOx concentration are used as the information indicating the operating state.
  • the required supply amount W of urea water is calculated based on the exhaust gas flow rate Q, the exhaust gas temperature T, and the NOx concentration C using a three-dimensional map as shown in FIG.
  • the spray speed control unit 24 can control the speed of the spray supplied by the injection device 13 in the exhaust flow direction (spray flow speed).
  • the injection direction of the reducing agent injection valve 18 is directed to the flow direction of exhaust gas, and the spray speed control unit 24 controls the spray flow speed by adjusting the penetration force of the spray. That is, as shown in FIG. 3, the spray speed control unit 24 reduces the injection pressure of the injection device 13 as the required spray flow speed X is slower, and suppresses the injection speed. In this way, the spray speed control unit 24 controls the speed of the spray in the exhaust flow direction by adjusting the injection speed of the reducing agent by the injection device 13.
  • the spray velocity control unit 24 slows the spray flow velocity as it is determined that the deposit is likely to occur based on the operating state of the engine 90. Specifically, the spray velocity control unit 24 calculates a spray flow velocity required to reduce the amount of urea water that collides with the wall surface in the exhaust path in a liquid state to a predetermined value or less, and the spray flow velocity becomes a required value.
  • the injection device 13 is driven so that In other words, from the viewpoint of suppressing the generation of deposits, it is taken into consideration what speed the spray should have in order to promote vaporization of the reducing agent before reaching the wall surface.
  • the required spray flow velocity X is calculated based on the exhaust flow rate Q, the exhaust temperature T, and the required supply amount W by using a three-dimensional map as shown in FIG. The spray velocity control unit 24 slows the spray flow velocity X as the exhaust gas flow rate Q increases, the exhaust gas temperature T decreases, and the required supply amount W increases.
  • the spray velocity control unit 24 slows the spray flow velocity X as the temperature of the wall surface (hereinafter, wall temperature) expected to collide with the spray is lower.
  • the wall surface temperature is acquired from the detection signal of the wall surface temperature sensor 99 provided in the exhaust passage 91.
  • the relationship shown in FIG. 5 is used, and the smaller the wall surface temperature Tw, the smaller the correction coefficient C is calculated.
  • the final required value of the spray flow velocity X is a value obtained by multiplying the read value of the map of FIG. 4 and the correction coefficient C.
  • Each functional unit 21 to 24 of the control unit 14 may be realized by hardware processing by a dedicated logic circuit, or a CPU executes a program previously stored in a memory such as a computer-readable non-transitory tangible recording medium. It may be realized by software processing by doing, or may be realized by a combination of both. Which part of each of the functional units 21 to 24 is realized by hardware processing and which part is realized by software processing can be appropriately selected. This also applies to the functional units described below.
  • the control unit 14 executes each process shown in FIG.
  • the routine of FIG. 6 is repeatedly executed at a predetermined timing.
  • S means a step.
  • the exhaust flow rate Q, the exhaust temperature T, and the NOx concentration C are acquired from the detection signals of various sensors. After S10, the process proceeds to S20.
  • S20 it is determined whether the exhaust temperature T is equal to or higher than the threshold value Tx. If the exhaust temperature T is equal to or higher than the threshold value Tx (S20: YES), the process proceeds to S30. When the exhaust gas temperature T is lower than the threshold value Tx (S20: NO), the process exits the routine of FIG.
  • the required supply amount W is calculated according to the information acquired in S10. After S30, the process proceeds to S40.
  • the required value of the spray flow velocity X is calculated based on the information acquired in S10 and the required supply amount W calculated in S30.
  • a subroutine for spray flow velocity control shown in FIG. 7 is called and executed.
  • the target injection pressure of the injection device 13 is calculated according to the spray flow velocity X in S101. After S101, the process proceeds to S102.
  • the exhaust purification system 10 calculates the required supply amount of the reducing agent according to the catalyst 11 that reduces and purifies the predetermined component in the exhaust gas of the engine 90 and the operating state of the engine 90.
  • the supply amount calculation unit 23 the injection device 13 that supplies the reducing agent liquid as a spray, and the spray speed control unit 24 that can control the spray flow speed.
  • the spray speed control unit 24 slows the spray flow speed as it is determined based on the operating state of the engine 90 that a deposit is likely to occur.
  • the supply of the reducing agent is stabilized by suppressing the generation of deposits, which leads to a reduction in the reducing agent slip (the reducing agent passes through the catalyst 11 and flows downstream). Therefore, the catalyst for purifying the slipped reducing agent can be downsized or eliminated.
  • the spray speed control unit 24 controls the spray flow speed by adjusting the injection speed of the reducing agent by the injection device 13. As a result, the spray flow rate can be reduced under the condition that deposits are likely to occur.
  • the spray speed control unit 24 slows the spray flow speed as the exhaust gas temperature is lower. The lower the exhaust gas temperature, the slower the heat received from the exhaust gas and the more easily the reducing agent deposits on the wall surface, so the spray flow speed is slowed to promote vaporization.
  • the spray velocity control unit 24 slows the spray flow velocity as the temperature of the wall surface at which the spray is expected to collide is lower. Even if the exhaust temperature is high, if the colliding wall surface is cold, the spray flow speed is slowed in consideration of the condition that deposits are likely to occur until the wall surface becomes warm.
  • the spray velocity control unit 24 slows the spray flow velocity as the required supply amount increases. In order to suppress the amount of reducing agent that accumulates on the wall surface and becomes a deposit, increasing the amount of reducing agent that vaporizes before reaching the wall surface balances with the increase in the required supply amount. Further, it is balanced with the fact that the exhaust temperature is lowered by the latent heat and it is difficult to vaporize.
  • the spray velocity control unit 24 slows the spray flow velocity as the exhaust gas flow rate increases. In order to prevent the time required for the reducing agent to reach the wall surface from being shortened, the spray flow velocity is slowed to increase the time for the reducing agent to vaporize.
  • the spray speed control unit 34 shown in FIG. 8 makes the injection speed of the reducing agent relatively fast by making the injection time per injection of the injection device 13 relatively long.
  • the injection time is the valve opening time of the reducing agent injection valve 18. This utilizes the relationship that the penetration force of the spray (that is, the injection speed) gradually increases from immediately after the injection until the injection becomes stable, as shown in FIG.
  • the injection cycle Pi of the injection device 13 is determined. Specifically, first, the injection amount q per injection is calculated from the valve opening time Ti from the relationship shown in FIG. Then, the required injection number f per second is calculated based on the required supply amount W and the injection amount q. The injection cycle Pi is determined based on the required injection frequency f. After S112, the process proceeds to S113.
  • the injection cycle Pi is corrected. Specifically, first, an error ⁇ W of the injection amount, which is the difference between the required supply amount W and the actual injection amount Wf, is calculated.
  • the actual injection amount Wf is detected by, for example, a flow meter provided upstream of the reducing agent injection valve 18. Then, the required number of injections f* after correction is calculated from the following equation (1).
  • the corrected injection period Pi* is determined based on the corrected required number of injections f*.
  • the injection signal is set according to the injection time Ti and the corrected injection cycle Pi*. After S114, the process returns to the main routine of FIG.
  • the spray speed control unit 34 makes the injection speed of the reducing agent relatively fast by making the injection time per injection of the injection device 13 relatively long.
  • the spray flow velocity can be controlled by utilizing the change in the penetration force of the spray depending on the injection time.
  • the injection direction of the reducing agent injection valve 18 is directed against the flow of exhaust gas, and the spraying speed control unit 44 makes the injection speed of the reducing agent relatively fast. This results in a relatively slow spray flow rate. That is, as shown in FIG. 14, the spray speed control unit 44 increases the injection pressure of the injection device 13 to increase the injection speed as the required spray flow speed X is slower. This makes it possible to suppress the generation of deposits without reducing the supply amount of the reducing agent even under the condition that the vaporization time is short even if the spray flow velocity immediately after injection is set to 0. Further, by increasing the injection pressure, atomization of the spray is promoted, and it is possible to obtain an auxiliary effect that vaporization is facilitated.
  • the spray speed control unit 54 adjusts the injection speed of the reducing agent by changing the injection pressure and the valve lift amount of the reducing agent injection valve 18. Specifically, as shown in FIG. 16, the spray velocity control unit 54 makes the valve lift amount relatively small and makes the reducing agent injection velocity relatively slow as the required spray flow velocity X is slow. By reducing the valve lift amount, the lateral flow of the reducing agent inside the reducing agent injection valve 18 is strengthened and the turbulence is enhanced, so that atomization is promoted. The finer the atomization, the faster the spraying speed decreases, and the penetration force of the spraying becomes smaller.
  • FIG. 16 shows an example of three-step change.
  • the injection pressure is set according to the valve lift amount as shown in FIG. Atomization progresses as the valve lift decreases. Therefore, in order to maintain the penetration force, the injection pressure is increased as the spray flow velocity X required in the same valve lift amount section increases.
  • the process proceeds to S123.
  • the required spray flow velocity X is less than or equal to the predetermined value X2 (S121: NO)
  • the process proceeds to S122.
  • valve lift amount is changed according to the required spray flow velocity X. After S122, the process proceeds to S123.
  • the target injection pressure of the injection device 13 is calculated according to the required spray flow velocity X. After S123, the process proceeds to S124.
  • the spray speed control unit 54 adjusts the reducing agent injection speed by changing the injection pressure and the valve lift amount of the reducing agent injection valve 18.
  • the spraying speed control unit 54 makes the injection speed of the reducing agent relatively slow by making the valve lift amount relatively small.
  • the valve lift amount By reducing the valve lift amount, the lateral flow of the reducing agent inside the reducing agent injection valve 18 is strengthened, and the turbulence is strengthened to promote atomization and reduce the penetration force of the spray. This can be used to control the spray flow rate.
  • a gas ejection portion 61 capable of applying an external force to the spray is provided in the exhaust passage 91.
  • the gas ejection part 61 ejects gas toward the spray.
  • the spray is held back by impinging on the gas, reducing the spray flow velocity.
  • the spray velocity control unit 64 controls the spray flow velocity by adjusting the external force acting on the spray. Specifically, the spray velocity control unit 64 controls the spray flow velocity by adjusting the momentum of the gas jetted by the gas jet unit 61.
  • the gas ejection velocity G by the gas ejection unit 61 is calculated based on the exhaust gas flow rate Q, the required spray flow velocity X, and the required supply amount W using a three-dimensional map as shown in FIG.
  • the spray velocity control unit 64 increases the gas ejection velocity G as the exhaust gas flow rate Q increases, the required spray flow velocity X decreases, and the required supply amount W increases.
  • the control unit 14 executes each process shown in FIG. After S10 to S50 are performed as in the first embodiment, the gas ejection speed G is determined in S55. After S55, the process proceeds to S65.
  • the reducing agent injection valve 18 is driven to inject the reducing agent, and the gas ejection section 61 is driven to inject gas toward the spray. After S65, the process exits the routine of FIG.
  • the gas flow may be jetted toward the spray, and the spray flow velocity may be controlled by momentum exchange between the spray and the gas.
  • the purification target is not limited to NOx, but may be dinitrogen monoxide N 2 O, carbon dioxide CO 2, or the like.
  • the reducing agent is not limited to urea water, and organic substances such as hydrocarbons and alcohols that are more easily oxidized than the object to be purified, hydrogen peroxide water, and the like may be used.
  • not only the reducing agent but also a precursor of the reducing agent may be supplied.
  • the exhaust flow rate when calculating the required supply amount of the reducing agent, may be replaced with, for example, the engine speed, or the exhaust temperature may be replaced with, for example, the accelerator opening degree or the fuel injection amount.
  • a two-dimensional map as shown in FIG. 22 is used without using the NOx concentration, and the required supply amount W of the urea water is calculated based on the engine speed R and the accelerator opening A. It may be calculated.
  • the injection direction of the reducing agent injection valve is directed against the flow of exhaust gas, and as shown in FIG.
  • the injection time may be increased to increase the injection speed.
  • the spray flow velocity was controlled by changing the gas injection velocity.
  • the spray flow velocity may be controlled by changing the gas injection amount, or the spray flow velocity may be controlled by changing both the gas injection velocity and the gas injection amount. May be.
  • the gas is injected from the gas injection portion as in the fifth embodiment with respect to the spray injected from the reducing agent injection valve in the direction opposite to the flow of exhaust gas as in the third embodiment.
  • the spray flow velocity may be controlled.
  • the injection pressure or the injection direction may be changed by properly using a plurality of reducing agent injection valves to control the spray flow velocity.
  • the spray flow velocity was controlled by the collision of gas as an external force.
  • an air assist injector is used as the reducing agent injection valve, and by reducing the amount of air supplied inside the air assist injector, an effect equivalent to pseudo negative momentum application is provided.
  • the spray flow velocity may be controlled.
  • the gas ejection unit is provided in the injection device, and external force is applied to the reducing agent before injection.
  • a part of the exhaust pipe and one or both of the catalyst may be charged or magnetized to the same polarity together with the spray, and the spray may be decelerated by the repulsive force to control the spray flow rate.
  • the spray flow velocity may be controlled by causing the sprays injected from the plurality of reducing agent injection valves to collide with each other.
  • the temperature of the reducing agent before injection may be acquired, and a correction may be made to determine that the higher the temperature, the more difficult it is to deposit.
  • the reducing agent in the spray is concentrated due to the progress of vaporization to the wall surface, and there is a possibility of depositing even under the condition that the original concentration does not deposit on the wall surface and does not deposit. is there.
  • the spray flow velocity X may be locally increased in a predetermined exhaust gas temperature region Rt to suppress the deposit formation.
  • control unit and the method described in the present disclosure are realized by a dedicated computer provided by configuring a processor and a memory programmed to execute one or more functions embodied by a computer program. May be done.
  • control unit and the method described in the present disclosure may be realized by a dedicated computer provided by configuring a processor with one or more dedicated hardware logic circuits.
  • control unit and the method thereof described in the present disclosure are based on a combination of a processor and a memory programmed to execute one or more functions and a processor configured by one or more hardware logic circuits. It may be implemented by one or more dedicated computers configured.
  • the computer program may be stored in a computer-readable non-transition tangible recording medium as an instruction executed by a computer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Biomedical Technology (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
PCT/JP2019/049590 2018-12-28 2019-12-18 エンジンの排気浄化システム WO2020137739A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-247795 2018-12-28
JP2018247795A JP6930521B2 (ja) 2018-12-28 2018-12-28 エンジンの排気浄化システム

Publications (1)

Publication Number Publication Date
WO2020137739A1 true WO2020137739A1 (ja) 2020-07-02

Family

ID=71129729

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/049590 WO2020137739A1 (ja) 2018-12-28 2019-12-18 エンジンの排気浄化システム

Country Status (2)

Country Link
JP (1) JP6930521B2 (enrdf_load_stackoverflow)
WO (1) WO2020137739A1 (enrdf_load_stackoverflow)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005214172A (ja) * 2004-02-02 2005-08-11 Nissan Diesel Motor Co Ltd エンジンの排気浄化装置
JP2005273579A (ja) * 2004-03-25 2005-10-06 Nissan Diesel Motor Co Ltd エンジンの排気浄化装置
JP2008180202A (ja) * 2007-01-26 2008-08-07 Nissan Diesel Motor Co Ltd 排気浄化装置
JP2011106313A (ja) * 2009-11-16 2011-06-02 Ud Trucks Corp エンジンの排気浄化装置
JP2017122391A (ja) * 2016-01-06 2017-07-13 株式会社Ｓｏｋｅｎ 内燃機関の排気浄化装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005214172A (ja) * 2004-02-02 2005-08-11 Nissan Diesel Motor Co Ltd エンジンの排気浄化装置
JP2005273579A (ja) * 2004-03-25 2005-10-06 Nissan Diesel Motor Co Ltd エンジンの排気浄化装置
JP2008180202A (ja) * 2007-01-26 2008-08-07 Nissan Diesel Motor Co Ltd 排気浄化装置
JP2011106313A (ja) * 2009-11-16 2011-06-02 Ud Trucks Corp エンジンの排気浄化装置
JP2017122391A (ja) * 2016-01-06 2017-07-13 株式会社Ｓｏｋｅｎ 内燃機関の排気浄化装置

Also Published As

Publication number Publication date
JP6930521B2 (ja) 2021-09-01
JP2020106011A (ja) 2020-07-09

Similar Documents

Publication Publication Date Title
CN103857889B (zh) 预注射废气流量调节器
JP5171509B2 (ja) エンジンの排気浄化装置
US7784272B2 (en) Control system for an engine aftertreatment system
JP2008051089A (ja) 排気浄化装置
WO2011108110A1 (ja) 内燃機関の排気浄化装置
US9441516B2 (en) Method for NOx reduction
JP2009275666A (ja) 内燃機関の排気浄化装置
JP2008180202A (ja) 排気浄化装置
US20170101913A1 (en) System and method for varying reductant delivery pressure to aftertreatment systems
WO2013191067A1 (ja) 尿素水噴射装置
JP4708320B2 (ja) Ｎｏｘ浄化装置
CN108979802A (zh) 一种无压力传感器的尿素泵泵压控制方法
JP6685728B2 (ja) 内燃機関の排気浄化装置
JP2010144632A (ja) 排気浄化装置
WO2020137739A1 (ja) エンジンの排気浄化システム
WO2013153606A1 (ja) 内燃機関の排気浄化装置
JP2014181576A (ja) 排気浄化システムおよびこれを備えた船舶
JP6927261B2 (ja) エンジンの触媒反応システム
KR102540930B1 (ko) 차량의 scr 촉매 장치 및 그의 제어방법
JP6120020B2 (ja) 内燃機関の排気浄化装置
JP4408051B2 (ja) エンジンの排気浄化装置
WO2020137750A1 (ja) エンジンの触媒反応システム
US11639679B2 (en) Dynamic monitoring of the flow rate of liquid additive injected into a motor vehicle exhaust gas treatment system
KR101230417B1 (ko) 배기가스의 질소산화물 저감장치
KR20220099996A (ko) 가수분해 시스템, 탈질설비 및 가수분해 시스템의 제어방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19905770

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19905770

Country of ref document: EP

Kind code of ref document: A1