CN104727906A - Exhaust gas purifying system for vehicle - Google Patents

Exhaust gas purifying system for vehicle Download PDF

Info

Publication number
CN104727906A
CN104727906A CN201410449722.5A CN201410449722A CN104727906A CN 104727906 A CN104727906 A CN 104727906A CN 201410449722 A CN201410449722 A CN 201410449722A CN 104727906 A CN104727906 A CN 104727906A
Authority
CN
China
Prior art keywords
cleaning
catalyst converter
triple
exhaust gas
catalyst
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.)
Granted
Application number
CN201410449722.5A
Other languages
Chinese (zh)
Other versions
CN104727906B (en
Inventor
韩坪铉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Motor Co
Kia Corp
Original Assignee
Hyundai Motor Co
Kia Motors Corp
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 Hyundai Motor Co, Kia Motors Corp filed Critical Hyundai Motor Co
Publication of CN104727906A publication Critical patent/CN104727906A/en
Application granted granted Critical
Publication of CN104727906B publication Critical patent/CN104727906B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F01N3/08—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
    • 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
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period
    • 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
    • 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
    • F01N3/101—Three-way catalysts
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/0295—Control according to the amount of oxygen that is stored on the exhaust gas treating 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

Abstract

An exhaust gas purifying system for a vehicle may include a three-way catalyst into which an exhaust gas from an engine is introduced, an SCR catalyst positioned downstream from the three-way catalyst and reducing NOx, an oxidizing catalyst positioned downstream from the three-way catalyst, a rear oxygen sensor positioned behind the three-way catalyst and a controller receiving signals from the rear oxygen sensor and controlling a catalyst purge, where the controller ends the catalyst purge while the signals still show a lean state, after starting the catalyst purge following end of a fuel-cut.

Description

For the exhaust gas purification system of vehicle
Technical field
The present invention relates to a kind of exhaust gas purification system for vehicle, more specifically, relate to a kind of exhaust gas purification system for gasoline vehicle.
Background technique
Gasoline is used generally to be designed to use triple-effect catalytic unit to remove HC, CO and NO as the vehicle of fuel x, these are the main waste pollutants in the exhausting air of motor.But, whole three kinds of main waste pollutants only can be purified to the level of hope by triple-effect catalytic unit in λ window, make the control that should perform fuel-air ratio to guarantee the performance of purification of exhaust gas, and this is very difficult, wherein this λ window is the very narrow scope of the excess air ratio of about λ=1.
Together with the control of fuel-air ratio, adding to triple-effect catalytic unit is such as cerium dioxide (CeO 2) oxygen storage substance, to allow the storage of the oxygen in the lean combustion state of motor and discharge oxygen in the enrichment combustion regime of motor.By doing like this, substantially in λ window, the scope of the λ that triple-effect catalytic unit stands is narrowed, makes it possible to the purification efficiency of the excellence guaranteeing triple-effect catalytic unit.
By way of parenthesis, if driving conditions allows, then control vehicle and perform fuel cut-off, to improve fuel efficiency.Now, fuel is not fed to motor, makes triple-effect catalytic unit be in oxygen coalescence condition and the oxygen storage substance under this sloppy condition in triple-effect catalytic unit stores a large amount of oxygen.
Therefore, even if the emitted dose of fuel is close to λ=1, due to a large amount of oxygen stored by oxygen storage substance after fuel cut-off, triple-effect catalytic unit is also in sloppy condition, makes a large amount of NO xbe discharged.
In order to process said circumstances, after controlling as high fuel cut-off by fuel-air ratio, performing catalyst converter cleaning, thus cause more fuel supply, to remove the oxygen be stored in oxygen storage substance.But, because supply and employ more multi fuel, so the fuel efficiency that catalyst converter is cleared up for vehicle has adverse influence.
Therefore, required, effectively can purify the toxic component in the exhausting air of motor and can contribute to improving the exhaust gas purification system for vehicle of fuel efficiency, and this cleaning system being prior art does not relate to.
The information being disclosed in background parts of the present invention is only intended to increase the understanding to general background of the present invention, and should not be interpreted as admitting or imply in any form that this information structure has been prior art that persons skilled in the art are known.
Summary of the invention
All aspects of of the present invention are devoted to provide a kind of exhaust gas purification system for vehicle, this system can effectively purify from use gasoline as the toxic component in the exhausting air of the motor of the vehicle of fuel, and can contribute to improving the fuel efficiency of vehicle.
Exhaust gas purification system for vehicle can comprise triple-effect catalytic unit, SCR catalyst, oxidation catalyzer, rearmounted lambda sensor and a controller, and wherein, the exhausting air from motor is introduced in triple-effect catalytic unit; SCR catalyst is positioned at the downstream of triple-effect catalytic unit and reductive NO x; Oxidation catalyzer is arranged in the downstream of triple-effect catalytic unit; After rearmounted lambda sensor is arranged in triple-effect catalytic unit; Controller receives the signal from rearmounted lambda sensor and controls catalyst converter cleaning, and wherein, start catalyst converter cleaning following the end of fuel cut-off after, while signal still shows sloppy condition, controller terminates catalyst converter cleaning.
Exhaust gas purification system for vehicle can comprise the oxidation catalyzer of the upstream being positioned at SCR catalyst.Or the exhaust gas purification system for vehicle can comprise the oxidation catalyzer in the downstream being positioned at SCR catalyst.
The method controlling the exhaust gas purification system being used for vehicle can comprise cleaning start-up check step, monitoring step and a cleaning end step, and wherein, after fuel cut-off, whether the cleaning of cleaning start-up check step determination catalyst converter starts; Monitoring step monitors the output value at the rearmounted lambda sensor of the downstream part of triple-effect catalytic unit, to determine whether output value shows sloppy condition after catalyst converter cleaning starts; When determining the output display sloppy condition of rearmounted lambda sensor in monitoring step, cleaning end step terminates catalyst converter cleaning.Cleaning end step can comprise, when the output value of rearmounted lambda sensor is close to terminating catalyst converter cleaning when leaving sloppy condition.
Be to be understood that, term as used herein " vehicle " or " vehicle " or other similar terms generally comprise motor vehicle, such as comprise the riding vehicle of sport vehicle (SUV), utility car, truck, various commerial vehicle, comprise the ship of various boat ship and boats and ships, aircraft etc., and comprise motor vehicle driven by mixed power, alternative fuel vehicle (such as coming from the fuel of the energy of non-gasoline).Motor vehicle driven by mixed power as referred to herein is the vehicle with two or more power sources, such as petrol power and electric vehicle.
By include in accompanying drawing herein and subsequently together with accompanying drawing for illustration of the embodiment of some principle of the present invention, the further feature that method and apparatus of the present invention has and advantage more specifically will become clear or be illustrated.
Accompanying drawing explanation
Fig. 1 is the figure of the exhaust gas purification system for vehicle illustrated according to an illustrative embodiment of the invention.
Fig. 2 is the figure of the exhaust gas purification system for vehicle illustrated according to an illustrative embodiment of the invention; And
Fig. 3 illustrates the flow chart of control according to an illustrative embodiment of the invention for the method for the exhaust gas purification system of vehicle.
Should understand, appended accompanying drawing is not the technique of painting slightly simplified of the illustrative various preferred feature that must show basic principle of the present invention pari passu.Specific design feature of the present invention disclosed herein comprises such as concrete size, direction, position and shape and will partly be determined by the environment specifically will applied and use.
In these figures, run through several figures of accompanying drawing, reference character quotes equally or equivalent parts of the present invention.
Embodiment
Next will make in detail different embodiments of the present disclosure and quoting, the example of embodiment is shown in the accompanying drawings and is described below.Although the present invention combines with illustrative embodiments and is described, should understand, this specification not intended to be limits the invention to those illustrative embodiments.On the contrary, the present invention is intended to not only contain exemplary embodiments, also contains and is contained in as the various changes in the spirit and scope of the invention of claims restriction, change, equivalent and other embodiments.Hereinafter, describe illustrative embodiments of the present invention with reference to appended accompanying drawing, make the personnel in the technical field belonging to the present invention can implement this illustrative embodiments.
Fig. 1 and Fig. 2 shows the illustrative embodiments of the exhaust gas purification system for vehicle of the present invention, and this system can comprise triple-effect catalytic unit 1, selective catalytic reduction (SCR) catalyst converter 3 and oxidation catalyzer 5; Exhausting air from motor is introduced in triple-effect catalytic unit 1; Selective catalytic reduction (SCR) catalyst converter 3 is positioned at the downstream of triple-effect catalytic unit 1 and reductive NO x; Oxidation catalyzer 5 is positioned at the downstream of triple-effect catalytic unit 1.
The present invention can be configured so that, in the situation similar to the situation run in the lean combustion state of triple-effect catalytic unit 1 at motor, uses the ammonia (NH produced from triple-effect catalytic unit 3), the SCR catalyst 3 being positioned at the downstream of triple-effect catalytic unit 1 purifies the NO discharged x, wherein the lean combustion state of motor causes due to the oxygen be stored in after fuel cut-off in oxygen storage substance.
Catalyst converter cleaning after fuel cut-off is the performance for recovering triple-effect catalytic unit 1 as early as possible, but considers fuel efficiency, and it is useful for terminating catalyst converter cleaning ahead of time, because fuel is Extra Supply between catalyst converter clear-up period.If terminate catalyst converter cleaning ahead of time, then terminate how early have according to catalyst converter cleaning, the performance of triple-effect catalytic unit 1 is not recovered fully, and NO xor CO/HC is discharged.But, due to terminating ahead of time of catalyst converter cleaning not by NO that triple-effect catalytic unit 1 processes xcan be purified by SCR catalyst 3, and can not purified by oxidized catalyst converter 5 by CO and HC that triple-effect catalytic unit 1 processes.Further, along with catalyst converter cleaning terminates ahead of time, fuel efficiency also can get a promotion.NO xthe time point place comparatively early that the main cleaning of catalyst converter wherein terminates discharges, and CO and HC mainly discharges in the more late time point place that catalyst converter cleaning terminates.
In one aspect of the present invention as shown in Figure 1, oxidation catalyzer 5 is positioned at the upstream of SCR catalyst 3, and on the other hand, oxidation catalyzer 5 is arranged in the downstream of SCR catalyst 3.In this aspect, oxidation catalyzer 5 and SCR catalyst 3 can only be positioned at the downstream of triple-effect catalytic unit 1.
Before preposition lambda sensor can be positioned at triple-effect catalytic unit 1, after rearmounted lambda sensor 7 can be positioned at triple-effect catalytic unit, and the signal that these lambda sensors produce can be provided to ECU (control unit of engine) to allow ECU control motor, wherein ECU is controller.
ECU receives the signal from rearmounted lambda sensor 7 and can control catalyst converter cleaning.In the present invention, start catalyst converter cleaning following the end of fuel cut-off after, while the signal from rearmounted lambda sensor 7 still shows sloppy condition, ECU terminates catalyst converter cleaning.
In other words, ECU stops catalyst converter cleaning as prior art under the visual angle of the signal from rearmounted lambda sensor 7 when sloppy condition changes into enrichment state, but while signal still shows sloppy condition, stop catalyst converter cleaning." sloppy condition " means, performed enrichment burning within the engine although cleared up by catalyst converter, the signal from rearmounted lambda sensor 7 still identifies sloppy condition.
Fig. 3 illustrates the flow chart of control according to an illustrative embodiment of the invention for the method for the exhaust gas purification system of vehicle, and the method can comprise:
Cleaning start-up check step S10, after fuel cut-off, cleaning start-up check step S10 determines whether catalyst converter cleaning starts.Cleaning start-up check step S10 can be configured to occur after fuel cut-off stops.
The output value of the rearmounted lambda sensor 7 of monitoring step S20, monitoring step S20 monitoring in the downstream of triple-effect catalytic unit 1, to determine whether output value shows sloppy condition after catalyst converter cleaning starts.
Cleaning end step S30, when determining the output display sloppy condition of rearmounted lambda sensor 7 in monitoring step S20, cleaning end step S30 terminates catalyst converter cleaning.
In one aspect of the invention, as described in correlation technique, while vehicle travels, after execution fuel cut-off, in cleaning start-up check step S10, check that catalyst converter cleaning starts.In monitoring step S20, the output value of rearmounted lambda sensor 7 obtains continuous print monitoring, when determining that the output value of rearmounted lambda sensor 7 does not also show enrichment state but shows sloppy condition, catalyst converter cleaning is forced to terminate, and the NO discharged in this process xpurified by SCR catalyst 3, and the oxidized catalyst converter 5 of a small amount of CO and HC purifies.
Cleaning end step S30 can be configured to, when the output value of rearmounted lambda sensor 7 is close to terminating catalyst converter cleaning when leaving sloppy condition.Such as, are 450mV in the standard output value of rearmounted lambda sensor 7, and the output value of 200mV or lower display sloppy condition, and 600mV or higher output value display enrichment state when, terminate when output value is near 200mV catalyst converter cleaning.Catalyst converter cleaning also can terminate under 600mV, makes by the NO of SCR process xamount reduce, and triple-effect catalytic unit is more cleared up.
Above-mentioned mode of execution is example of the present invention and main idea, although catalyst converter cleaning obtains determining based on the output value of rearmounted lambda sensor 7 as in the related, but catalyst converter cleaning can not continue until determine that it is in enrichment state, but the correlation technique of comparing, catalyst converter cleaning earlier terminates, and the NO produced in this process xdisposed by SCR catalyst 3, and the oxidized catalyst converter 5 of a small amount of HC and CO is disposed.
As mentioned above, according to specific exemplary embodiments of the present disclosure, can effectively purify from use gasoline as the toxic component in the exhausting air of the motor of the vehicle of fuel, thus the fuel efficiency of vehicle can be improved.
The aforementioned description to concrete illustrative embodiments of the present invention is to illustrate and the object of illustration.Limit the present invention is not thought in these descriptions, or the present invention is defined as disclosed precise forms, and, according to above-mentioned instruction, can much change and change.The object selected illustrative embodiments and describe is to explain certain principles of the present invention and practical application thereof, thus others skilled in the art can be realized and utilize various different illustrative embodiments of the present invention and various different selection and change.Scope of the present invention is intended to limited by appending claims and equivalents thereof.

Claims (5)

1., for an exhaust gas purification system for vehicle, comprising:
Triple-effect catalytic unit, the exhausting air from motor is introduced in described triple-effect catalytic unit;
SCR catalyst, described SCR catalyst is positioned at the downstream of described triple-effect catalytic unit and reductive NO x;
Oxidation catalyzer, described oxidation catalyzer is positioned at the downstream of described triple-effect catalytic unit;
Rearmounted lambda sensor, after described rearmounted lambda sensor is positioned at described triple-effect catalytic unit; And
Controller, described controller receives the signal from rearmounted lambda sensor and controls catalyst converter cleaning, wherein, start the cleaning of described catalyst converter following the end of fuel cut-off after, while signal still shows sloppy condition, described controller terminates the cleaning of described catalyst converter.
2. the exhaust gas purification system for vehicle according to claim 1, wherein said oxidation catalyzer is positioned at the upstream of described SCR catalyst.
3. the exhaust gas purification system for vehicle according to claim 1, wherein said oxidation catalyzer is positioned at the downstream of described SCR catalyst.
4. control a method for the exhaust gas purification system for vehicle according to claim 1, described method comprises:
Cleaning start-up check step, after fuel cut-off, whether described cleaning start-up check step determination catalyst converter cleaning starts;
Monitoring step, described monitoring step monitors the output value at the described rearmounted lambda sensor of the downstream part of described triple-effect catalytic unit, to determine whether described output value shows sloppy condition after described catalyst converter cleaning starts; And
Cleaning end step, when described in the output display determining described rearmounted lambda sensor in described monitoring step during sloppy condition, described cleaning end step terminates the cleaning of described catalyst converter.
5. the method for the control according to claim 4 exhaust gas purification system for vehicle according to claim 1, wherein said cleaning end step comprises, when the output value of described rearmounted lambda sensor is close to terminating the cleaning of described catalyst converter when leaving described sloppy condition.
CN201410449722.5A 2013-12-18 2014-09-04 Exhaust gas purification system for vehicle Expired - Fee Related CN104727906B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2013-0158770 2013-12-18
KR1020130158770A KR101551017B1 (en) 2013-12-18 2013-12-18 Exhaust gas purifying system for vehicle

Publications (2)

Publication Number Publication Date
CN104727906A true CN104727906A (en) 2015-06-24
CN104727906B CN104727906B (en) 2019-04-19

Family

ID=53367820

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410449722.5A Expired - Fee Related CN104727906B (en) 2013-12-18 2014-09-04 Exhaust gas purification system for vehicle

Country Status (4)

Country Link
US (1) US20150167522A1 (en)
KR (1) KR101551017B1 (en)
CN (1) CN104727906B (en)
DE (1) DE102014111741A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111140389A (en) * 2019-12-25 2020-05-12 中国第一汽车股份有限公司 Oxygen cleaning method for gasoline engine catalyst

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101734713B1 (en) 2015-12-10 2017-05-24 현대자동차주식회사 Three Way Catalytic Control Method and System for Decreasing Fuel Consumption and Vehicle thereof
KR102440576B1 (en) 2016-12-13 2022-09-05 현대자동차 주식회사 Exhaust gas purification apparatus and method for controlling the same
KR102417384B1 (en) 2016-12-14 2022-07-06 현대자동차주식회사 Control method for exhaust gas recirculation
KR20180070114A (en) 2016-12-16 2018-06-26 현대자동차주식회사 Method for controlling catalytic system for hybrid vehicle and three way catalytic converter
KR102365178B1 (en) 2017-09-01 2022-02-18 현대자동차 주식회사 Exhaust system of turbo gasoline direct injection engine and control method thereof
KR20220017033A (en) 2020-08-03 2022-02-11 현대자동차주식회사 Catalyst system for reduction of emitted gases from automobile

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020116920A1 (en) * 2001-01-30 2002-08-29 Omg Ag & Co. Kg Exhaust gas treatment unit for internal combustion engines and processes for operatin therm
JP2009036117A (en) * 2007-08-02 2009-02-19 Toyota Motor Corp Air-fuel ratio controller of internal combustion engine
CN102235217A (en) * 2010-05-04 2011-11-09 通用汽车环球科技运作有限责任公司 Control system and method for preventing hydrocarbon slip during particulate matter filter regeneration
CN102235259A (en) * 2010-04-28 2011-11-09 通用汽车环球科技运作有限责任公司 Post-combustion fuel injection control systems and methods
CN102278178A (en) * 2010-05-27 2011-12-14 罗伯特·博世有限公司 A method for operating an scr catalytic converter

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4964271A (en) * 1987-03-06 1990-10-23 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio feedback control system including at least downstream-side air-fuel ratio sensor
JP3680244B2 (en) * 1999-02-12 2005-08-10 トヨタ自動車株式会社 Adsorption amount calculation device for unburned fuel component adsorbent of internal combustion engine
JP3753936B2 (en) 2000-12-05 2006-03-08 本田技研工業株式会社 Exhaust gas purification device for internal combustion engine
JP4389141B2 (en) 2001-05-18 2009-12-24 株式会社デンソー Exhaust gas purification device for internal combustion engine
JP4233490B2 (en) * 2004-05-25 2009-03-04 三菱電機株式会社 Control device for internal combustion engine
JP4470661B2 (en) * 2004-09-09 2010-06-02 株式会社デンソー Exhaust gas sensor abnormality diagnosis device
JP2006329113A (en) * 2005-05-27 2006-12-07 Mitsubishi Motors Corp Catalytic deterioration detecting device
JP2007177759A (en) * 2005-12-28 2007-07-12 Toyota Motor Corp Internal combustion engine controller
JP4890209B2 (en) * 2006-11-24 2012-03-07 本田技研工業株式会社 Exhaust gas purification device for internal combustion engine
JP2009221992A (en) * 2008-03-17 2009-10-01 Denso Corp Malfunction diagnosing apparatus for exhaust gas sensor
JP5332708B2 (en) * 2009-02-23 2013-11-06 日産自動車株式会社 Diagnostic device for exhaust sensor for internal combustion engine
JP4989738B2 (en) * 2010-02-09 2012-08-01 本田技研工業株式会社 Exhaust gas purification device for internal combustion engine
WO2011148517A1 (en) * 2010-05-28 2011-12-01 トヨタ自動車株式会社 Air-fuel ratio control device for internal combustion engine
CN103443431B (en) * 2011-03-28 2016-08-31 丰田自动车株式会社 Air-fuel ratio deviation abnormal detector between the cylinder of internal-combustion engine with multi-cylinders
WO2013061697A1 (en) * 2011-10-24 2013-05-02 日産自動車株式会社 Control device for spark ignition internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020116920A1 (en) * 2001-01-30 2002-08-29 Omg Ag & Co. Kg Exhaust gas treatment unit for internal combustion engines and processes for operatin therm
JP2009036117A (en) * 2007-08-02 2009-02-19 Toyota Motor Corp Air-fuel ratio controller of internal combustion engine
CN102235259A (en) * 2010-04-28 2011-11-09 通用汽车环球科技运作有限责任公司 Post-combustion fuel injection control systems and methods
CN102235217A (en) * 2010-05-04 2011-11-09 通用汽车环球科技运作有限责任公司 Control system and method for preventing hydrocarbon slip during particulate matter filter regeneration
CN102278178A (en) * 2010-05-27 2011-12-14 罗伯特·博世有限公司 A method for operating an scr catalytic converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111140389A (en) * 2019-12-25 2020-05-12 中国第一汽车股份有限公司 Oxygen cleaning method for gasoline engine catalyst
CN111140389B (en) * 2019-12-25 2022-08-05 中国第一汽车股份有限公司 Oxygen cleaning method for gasoline engine catalyst

Also Published As

Publication number Publication date
DE102014111741A1 (en) 2015-07-09
US20150167522A1 (en) 2015-06-18
KR101551017B1 (en) 2015-09-07
KR20150071580A (en) 2015-06-26
CN104727906B (en) 2019-04-19

Similar Documents

Publication Publication Date Title
CN104727906A (en) Exhaust gas purifying system for vehicle
CN107023355B (en) Exhaust gas purification system and control method thereof
EP3158174B1 (en) Deterioration diagnosis apparatus for exhaust gas purification apparatus
EP2455599B1 (en) Method for predicting NOx amount and exhaust system using the same
US9228474B2 (en) Method and system of determining failure of urea quality sensor
EP3111071A1 (en) Method and system for controlling nitrogen oxide emissions from a combustion engine
RU2008107276A (en) METHOD FOR SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDES IN EXHAUST GASES FORMED WHEN THE INTERNAL COMBUSTION ENGINE IS OPERATED, AND THE EXHAUST GAS ISSUE SYSTEM
US9599002B2 (en) Engine control method for maintaining performance of oxidation catalyst
EP2460999A2 (en) Method for predicting SOx stored at DeNOx catalyst and exhaust system using the same
US9494070B2 (en) Method of controlling ammonia amount absorbed in selective catalytic reduction catalyst and exhaust system using the same
KR20120036004A (en) Exhaust gas reducing device for vehicles with burner to improve purification performance
US8763373B2 (en) System for purifying exhaust gas and method for controlling the same
US9777652B2 (en) Method and system of driver inducement for vehicle
US10883432B2 (en) Exhaust gas purification system for vehicle and method of controlling the same
US20170362989A1 (en) Nitrogen oxide purification system and control method of the same
US20170268397A1 (en) Catalytic device for stoichiometric air-fuel ratio gasoline engine and catalytic system including the same
KR20200044414A (en) Exhaust gas purification system for vehicle
KR102365178B1 (en) Exhaust system of turbo gasoline direct injection engine and control method thereof
JP5716652B2 (en) Control device for hybrid vehicle
KR102451900B1 (en) Exhaust gas post processing system and control method thereof
KR101865743B1 (en) Method and device for purifying exhaust gas of vehicle
KR101816424B1 (en) Controlling method of air fuel ratio of exhaust gas for Lean NOx Trap
JP4552860B2 (en) Control device for internal combustion engine
KR20180064868A (en) Method and device for purifying exhaust gas of vehicle
GB2593762A (en) Lean-burn gasoline engine aftertreatment system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20190419

Termination date: 20210904

CF01 Termination of patent right due to non-payment of annual fee