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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
  • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filter
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
  • F01N3/0814—Exhaust 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
  • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
  • F01N3/0842—Nitrogen oxides
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
  • F01N3/0871—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents using means for controlling, e.g. purging, the absorbents or adsorbents
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
  • F01N3/0871—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents using means for controlling, e.g. purging, the absorbents or adsorbents
  • F01N3/0878—Bypassing absorbents or adsorbents
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
  • F01N3/0871—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents using means for controlling, e.g. purging, the absorbents or adsorbents
  • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
• • 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
  • F01N3/103—Oxidation catalysts for HC and CO only
• • 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
• • 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
  • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • 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
  • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
• • 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
• • 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
  • F01N3/36—Arrangements for supply of additional fuel
• • 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
  • F01N9/00—Electrical control of exhaust gas treating apparatus
• • 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
  • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
  • F01N2240/25—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an ammonia generator
• • 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
  • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
  • F01N2240/30—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel reformer
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
  • F01N2410/12—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of absorption, adsorption or desorption of exhaust gas constituents
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • 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
  • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
  • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
  • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
• • 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
  • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
  • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature 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
  • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
  • F01N2570/18—Ammonia
• • 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
  • F01N2610/00—Adding substances to exhaust gases
  • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
• • 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
  • F01N2610/00—Adding substances to exhaust gases
  • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
  • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
  • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
• • 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
  • F01N2610/00—Adding substances to exhaust gases
  • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
  • F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
• • 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
  • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
  • F01N2900/06—Parameters used for exhaust control or diagnosing
  • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
• • 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
  • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
  • F01N2900/06—Parameters used for exhaust control or diagnosing
  • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
  • F01N2900/1602—Temperature of exhaust gas apparatus
• • 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
  • Y02T10/40—Engine management systems

Definitions

• the present invention includes an exhaust purification device that is provided in an exhaust passage of an internal combustion engine and includes a catalyst, and a pre-stage catalyst having an oxidation function that is provided in an exhaust passage upstream of the exhaust purification device.
• the present invention relates to an exhaust gas purification system for an internal combustion engine.
• the exhaust gas purification device includes an NOx storage reduction catalyst (hereinafter referred to as NOx catalyst), a pattille filter that carries the catalyst (hereinafter referred to as filter), and a combination thereof. Can be illustrated.
• NOx catalyst NOx storage reduction catalyst
• filter pattille filter that carries the catalyst
• a reducing agent addition valve for adding a reducing agent to the exhaust gas is further provided in the exhaust passage upstream of the upstream catalyst.
• the air-fuel ratio of the ambient atmosphere of the exhaust purification device is reduced, and the exhaust gas is introduced into the exhaust by the reducing agent addition valve.
• a reducing agent is added, thereby supplying the reducing agent to the front stage catalyst and the exhaust purification device.
• Japanese Patent Application Laid-Open No. 2000-0 1 2 7 2 5 7 describes a technique in which a reforming catalyst for reforming supplied fuel is provided on the upstream side of the NOx catalyst in the exhaust passage.
• Japanese Patent Laid-Open No. 2 0 5-1 2 7 2 5 7 discloses a technology in which a reforming catalyst is disposed in the center of an exhaust passage and a bypass route is formed on the outer periphery of the reforming catalyst. It is disclosed.
• the position where the reducing agent addition valve is located in the exhaust passage is a position where at least part of the reducing agent added to the exhaust reaches the upstream catalyst in a liquid state, the upstream catalyst reaches the upstream catalyst in a liquid state
• the reducing agent thus vaporized in the preceding catalyst.
• a part of the vaporized reducing agent is oxidized in the pre-stage catalyst, but the unoxidized reducing agent is supplied to the exhaust gas purification device.
• the reducing agent addition valve when the reducing agent addition valve is installed at a position where at least a part of the reducing agent added to the exhaust in the exhaust passage upstream of the upstream catalyst reaches the upstream catalyst in a liquid state, It is an object of the present invention to provide a technique capable of supplying a reducing agent in a suitable state by an exhaust purification device provided in an exhaust passage on the downstream side of the upstream catalyst.
• the flow rate of the exhaust gas flowing into the upstream catalyst is reduced so that at least a part of the reducing agent that reaches the upstream catalyst and vaporizes in the upstream catalyst flows backward. It is to reduce.
• an exhaust gas purification system for an internal combustion engine includes:
• An exhaust purification device that is provided in an exhaust passage of an internal combustion engine and includes a catalyst, and a pre-stage catalyst that has an oxidation function provided in an exhaust passage upstream of the exhaust purification device and that is upstream of the pre-stage catalyst
• a reducing agent addition valve that is provided in an exhaust passage and adds a reducing agent into the exhaust when supplying the reducing agent to the preceding catalyst and the exhaust purification device;
• An exhaust flow rate control means for controlling the flow rate of the exhaust gas flowing into the upstream catalyst, and the reducing agent addition valve is provided in the upstream catalyst with at least a part of the reducing agent added to the exhaust gas in a liquid state. It is installed at the position to reach,
• the exhaust flow rate control means is arranged so that at least a part of the reducing agent that reaches the upstream catalyst and vaporizes in the upstream catalyst flows backward.
• the flow rate of the exhaust gas flowing into the catalyst is reduced.
• the reducing agent that has reached the first stage catalyst in the liquid state is vaporized in the first stage catalyst, its volume increases. Inflate. This expansion causes a flow of reducing agent in a direction opposite to the direction in which the exhaust flows. Therefore, by reducing the flow rate of the exhaust gas flowing into the preceding catalyst when the reducing agent is added by the reducing agent addition valve, a part of the vaporized reducing agent can be reversed.
• the reducing agent can be supplied to the exhaust purification device in a more suitable state.
• the exhaust flow rate control means causes the expansion rate when the reducing agent that has reached the preceding catalyst is vaporized and expanded in the preceding catalyst.
• the flow rate of the exhaust gas may be controlled so that the flow rate of the exhaust gas flowing into the upstream catalyst becomes small.
• the reducing agent may be added to the exhaust gas by the reducing agent addition valve when the temperature of the exhaust gas hatching apparatus is raised.
• the reducing agent added from the reducing agent addition valve is oxidized in the catalyst included in the pre-stage catalyst and the exhaust purification device.
• the reducing agent that has not been oxidized in the pre-catalyst is supplied to the exhaust purification device in a more mixed state with the exhaust gas over a longer period. Therefore, the oxidation of the reducing agent in the catalyst included in the exhaust purification device can be further promoted. Therefore, the temperature rise performance of the exhaust purification device can be improved.
• the reducing agent is added to the reducing agent by the reducing agent addition valve when N 0 X or S 0 X stored in the NOX catalyst is released and reduced. May be added.
• the air-fuel ratio in the atmosphere surrounding the NO x catalyst can be lowered over a longer period. You can. Therefore, the release and reduction of NOX or SOX stored in the NOx catalyst can be further promoted.
• a bypass passage having one end connected to the exhaust passage upstream of the fuel addition valve and the other end connected to the exhaust passage downstream of the exhaust purification device, and the flow rate of the exhaust gas flowing through the bypass passage And a bypass control valve for controlling.
• the exhaust flow rate control means decreases the flow rate of the exhaust gas flowing into the preceding catalyst by increasing the flow rate of the exhaust gas flowing through the bypass passage by the bypass control valve. Also good.
• the flow rate of the exhaust gas flowing through the bypass passage is increased by the bypass control valve, the flow rate of the exhaust gas flowing through the bypass passage is temporarily increased when the reducing agent is added from the reducing agent addition valve.
• the flow rate of the exhaust gas flowing through the bypass passage may be controlled to be substantially zero by the bypass control valve. According to this, when the reducing agent is added from the reducing agent addition valve, the flow rate of the exhaust gas flowing into the preceding catalyst can be reduced, and the backflow of the reducing agent flowing back into the bypass passage can be suppressed. .
• the exhaust flow rate control means when the exhaust flow rate control means reduces the flow rate of the exhaust gas flowing into the front catalyst, the reducing agent vaporized and backflowed in the front catalyst.
• the flow rate of the exhaust gas flowing into the front catalyst may be controlled so that the exhaust gas does not reach the connection portion with one end of the bypass passage in the exhaust passage. This also suppresses the inflow of the backflowing reducing agent into the bypass passage.
• the exhaust flow rate control means increases the flow rate of the exhaust gas flowing through the bypass passage.
• the flow rate of the exhaust gas flowing into the front catalyst may be reduced by a method other than adding the same.
• the exhaust flow control means when the exhaust flow control means reduces the flow rate of the exhaust gas flowing into the front catalyst, the flow rate of the exhaust gas flowing through the bypass passage may be controlled to be substantially zero by the bypass control valve. According to this, the backflow of the reducing agent that has flowed back can be suppressed.
• the pre-stage catalyst may be formed so that exhaust flows between the outer peripheral surface thereof and the inner peripheral surface of the exhaust passage.
• the amount of exhaust flowing into the front catalyst is originally smaller than when all the exhaust flowing into the exhaust purification device passes through the front catalyst. Therefore, when the reducing agent reaches the upstream catalyst and is vaporized to expand, the reducing agent tends to flow backward. In this case, a part of the reducing agent that has vaporized and flowed back in the front catalyst passes between the outer peripheral surface of the front catalyst and the inner peripheral surface of the exhaust passage and is supplied to the exhaust purification device.
• FIG. 1 is a first diagram showing a schematic configuration of an intake and exhaust system of an internal combustion engine according to an embodiment.
• FIG. 2 is a graph showing the transition of the air-fuel ratio of the exhaust gas flowing into the filter when fuel is added from the fuel addition valve according to the example.
• FIG. 3 is a first flowchart showing a routine of the filter regeneration control according to the embodiment.
• FIG. 4 is a second flowchart showing the routine of the filter regeneration control according to the embodiment.
• FIG. 5 is a second diagram showing a schematic configuration of the intake and exhaust system of the internal combustion engine according to the embodiment.
• FIG. 1 is a diagram showing a schematic configuration of an intake / exhaust system of an internal combustion engine according to the present embodiment.
• the internal combustion engine 1 is a diesel engine for driving a vehicle.
• An intake passage 3 and an exhaust passage 2 are connected to the internal combustion engine 1.
• the intake passage 3 is provided with a throttle valve 7 and an air flow meter 8.
• the exhaust passage 2 is provided with a filter 5 for collecting particulate matter (hereinafter referred to as PM) in the exhaust.
• the filter 5 carries a N O X catalyst 9.
• the filter 5 and the NOx catalyst 9 correspond to the exhaust purification device according to the present invention.
• An oxidation catalyst 4 is provided upstream of the filter 5 in the exhaust passage 2.
• the oxidation catalyst 4 corresponds to the former catalyst according to the present invention.
• the oxidation catalyst 4 may be any catalyst having an oxidation function, and may be, for example, a three-way catalyst or a NOx catalyst.
• a fuel addition valve 6 for injecting fuel as a reducing agent and adding the fuel into the exhaust is provided in the exhaust passage 2 upstream of the oxidation catalyst 4.
• the fuel addition valve 6 is disposed close to the oxidation catalyst 4 so that the fuel injection hole through which the fuel is injected faces the upstream end face of the oxidation catalyst 4.
• Fuel is injected in a conical shape from the fuel injection hole of the fuel addition valve 6 (in FIG. 1, the hatched portion indicates fuel spray). At least a part of the injected fuel reaches the oxidation catalyst 4 in a liquid state.
• the fuel addition valve 6 corresponds to the reducing agent addition valve according to the present invention.
• an EGR a 15 is provided in order to introduce part of the exhaust gas to the internal combustion engine 1 as EGR gas.
• £ 0 (3 ⁇ 4passage 15 is connected at one end to the exhaust passage 2 upstream of the fuel addition valve 6 and at the other end of the intake passage 3 downstream of the throttle valve 7 It is connected to the.
• an EGR valve 16 is provided for controlling the flow rate of the EGR gas.
• a bypass passage 17 is provided in which the exhaust gas flows by bypassing the oxidation catalyst 4 and the filter 5.
• the bypass passage 17 has one end connected to the exhaust passage 2 upstream of the fuel addition valve 6 and the other end connected to the exhaust passage 2 downstream of the filter 5.
• the bypass passage 17 is provided with a bypass control valve 18 for controlling the flow rate of the exhaust gas flowing through the bypass passage 17.
• An air-fuel ratio sensor 13 for detecting the air-fuel ratio of the exhaust is provided between the oxidation catalyst 4 and the filter 5 in the exhaust passage 2. Further, a temperature sensor 14 for detecting the temperature of the exhaust is provided downstream of the filter 5 in the exhaust passage 2.
• the internal combustion engine 1 configured as described above is provided with an electronic control unit (ECU) 10 for controlling the internal combustion engine 1.
• the ECU 10 is electrically connected with an air flow meter 8, an air-fuel ratio sensor 13, a temperature sensor 14, a crank position sensor 11, and an accelerator opening sensor 12. These output signals are input to ECU 10.
• the crank position sensor 11 is a sensor that detects the crank angle of the internal combustion engine 1.
• the accelerator opening sensor 12 is a sensor that detects the accelerator opening of a vehicle equipped with the internal combustion engine 1.
• the ECU 10 calculates the engine speed of the internal combustion engine 1 based on the output value of the crank position sensor 11, and calculates the engine load of the internal combustion engine 1 based on the output value of the accelerator opening sensor 12. Further, the ECU 10 estimates the air-fuel ratio of the ambient atmosphere of the filter 5 (that is, the ambient atmosphere of the NO X catalyst 9) based on the output value of the air-fuel ratio sensor 13 and sets the output value of the temperature sensor 14 to Based on this, the temperature of the filter 5 (that is, the temperature of the NO X catalyst 9) is estimated.
• the ECU 10 is electrically connected to a throttle valve 7, a fuel addition valve 6, an EGR valve 16, a bypass control valve 18, and a fuel injection valve of the internal combustion engine 1. ECU 1 0 Therefore, these are controlled.
• filter regeneration control is performed to remove PM collected by the filter 5.
• the filter regeneration control according to the present embodiment is realized by adding fuel from the fuel addition valve 6 and thereby supplying fuel to the oxidation catalyst 4 and the filter 5.
• the temperature of the exhaust gas flowing into the filter 5 is raised by the oxidation heat.
• the temperature of the filter 5 is increased.
• the fuel that has not been oxidized in the oxidation catalyst 4 and has passed through the oxidation catalyst 4 is supplied to the filter 5.
• the temperature of the filter 5 is further raised by the oxidation heat.
• the temperature of the filter 5 can be raised to a temperature at which PM can be oxidized, thereby oxidizing and removing the PM collected in the filter 5. I can do it.
• the exhaust flow rate reduction control for reducing the flow rate of the exhaust gas flowing into the oxidation catalyst 4 is executed.
• the exhaust flow rate reduction control for reducing the flow rate of the exhaust gas flowing into the oxidation catalyst 4 is executed.
• at least part of the fuel added from the fuel addition valve 6 reaches the oxidation catalyst 4 in a liquid state.
• the fuel that has reached the oxidation catalyst 4 in a liquid state is vaporized by oxidation heat generated in the oxidation catalyst 4.
• the volume of the fuel expands.
• the flow rate of the exhaust gas flowing to the oxidation catalyst 4 is smaller than the fuel expansion rate, at least a part of the vaporized fuel flows in the reverse direction of the exhaust gas flow direction in the oxygen catalyst 4. Occurs.
• a part of the fuel that has vaporized and flows backward in the oxidation catalyst 4 once flows out from the upstream end face of the oxidation catalyst 4 and then flows into the oxidation catalyst 4 together with the exhaust gas.
• the fuel that once flowed back in the oxidation catalyst 4 and the fuel that once flowed out of the upstream end face of the oxidation catalyst 4 by flowing back and re-entered the oxidation catalyst 4 were not oxidized in the oxidation catalyst 4. Outflow from the downstream end face of 4 together with the exhaust fill 5 is supplied.
• FIG. 2 is a graph showing the transition of the air-fuel ratio of the exhaust gas flowing into the filter 5 when fuel is added from the fuel addition valve 6.
• the vertical axis represents the air-fuel ratio A / F of the exhaust gas flowing into the filter 5
• the horizontal axis represents time t.
• Curve L 1 represents the case where the back flow of the fuel that has reached the oxidation catalyst 4 does not occur
• curve L 2 represents the case where the fuel that has reached the oxidation catalyst 4 once flows back.
• the period during which the air-fuel ratio of the exhaust gas flowing into the filter 5 is lower is longer than when the fuel does not flow backward. . That is, it can be determined that the period during which fuel is supplied to the filter 5 is long.
• fuel can be supplied to the filter 5 in a more suitable state by causing a back flow of the fuel that has reached the oxidation catalyst 4 and vaporized. Therefore, in this embodiment, when the filter regeneration control is executed, the exhaust flow rate reduction control is executed, so that the fuel flows into the oxidation catalyst 4 rather than the expansion speed when the fuel vaporizes and expands in the oxidation catalyst 4. Reduce the flow rate of exhaust air.
• routine of the filter regeneration control according to the present embodiment will be described based on the flowchart shown in FIG.
• This routine is stored in advance in E C U 10 and is repeatedly executed at predetermined intervals during the operation of the internal combustion engine.
• the ECU 10 first determines in S 1 0 1 whether or not an execution condition for filter regeneration control is satisfied. Here, it may be determined that the condition for executing the filter regeneration control is satisfied when the collected amount of PM in the filter 5 exceeds a predetermined collected amount. Yes.
• the amount of PM trapped in the filter 5 can be estimated from the history of the operating state of the internal combustion engine 1 or the like. If an affirmative determination is made in S 1101, ECLM O proceeds to S102, and if a negative determination is made, ECU 10 once terminates execution of this routine.
• E C U 10 calculates the temperature Tc c 0 of the oxidation catalyst 4 based on the operating state of the internal combustion engine 1 and the like. Note that a temperature sensor may be provided immediately downstream of the oxidation catalyst 4 in the exhaust passage 2, and the temperature T c co of the oxidation catalyst 4 may be estimated based on the detected value of the temperature sensor.
• the ECU 10 proceeds to S 103 and calculates the fuel addition amount Q f ad d from the fuel addition valve 6 necessary for raising the temperature of the filter 5 to the target temperature in the filter regeneration control.
• the fuel addition amount Q f ad d can be calculated based on the difference between the current temperature of the filter 5 and the target temperature, the operating state of the internal combustion engine soot, and the temperature T c c 0 of the oxidation catalyst 4.
• ECLM 0 proceeds to S 104, and the expansion rate of the fuel when the fuel that has been added from the fuel addition valve 6 and reached the oxidation catalyst 4 in a liquid state is vaporized and expanded in the oxidation catalyst 4 V fex is calculated.
• the fuel expansion speed V f e X can be calculated based on the temperature Tc co of the oxidation catalyst 4 and the fuel addition amount Q f a d d.
• the ECU 10 proceeds to S 1 05 and sets a target exhaust flow rate V gast that is a target value of the flow rate of the exhaust gas flowing into the oxidation catalyst 4 when executing exhaust gas flow reduction control in S 1 06 described later. Set. At this time, the target exhaust flow rate Vg a st is also set to a small value for the fuel expansion speed V f eX calculated in S 104.
• the ECU 10 proceeds to S 106 and executes the exhaust flow rate reduction control to reduce the flow rate of the exhaust gas flowing into the oxidation catalyst 4 to the target exhaust flow rate V g a st.
• the throttle valve 7 is used to reduce the intake air amount of the internal combustion engine 1
• the EGR valve 16 is used to increase the EGR gas amount
• the bypass control valve 18 is used. Increase the flow rate of the exhaust flowing through the bypass passage 1 7 Control and the like can be exemplified.
• the intake air amount of the internal combustion engine 1 is reduced, the flow rate of the exhaust gas of the internal combustion engine 1 is reduced, so that the flow rate of the exhaust gas flowing into the oxidation catalyst 4 is inevitably reduced.
• the amount of EGR gas is increased, the flow rate of the exhaust gas flowing downstream is reduced rather than the connection portion of the exhaust passage 2 with the EGR passage 15, so that the flow rate of the exhaust gas flowing into the oxidation catalyst 4 is decreased.
• the exhaust flow rate control according to the present embodiment is realized by any one of these controls or by combining these controls.
• the ECU 10 that executes S 10 6 corresponds to the exhaust flow rate control means according to this embodiment.
• E C U 10 proceeds to S 10 07 and executes filter regeneration control by adding fuel from the fuel addition valve 6. After that, E CLM 0 once terminates execution of this routine.
• the fuel addition by the fuel addition valve 6 is executed in a state where the flow rate of the exhaust gas flowing into the oxidation catalyst 4 is smaller than the expansion rate when the fuel is vaporized and expanded in the oxidation catalyst 4. The For this reason, when the fuel reaches the oxidation catalyst 4 and is vaporized, the fuel flows backward.
• the fuel can be supplied to the filter 5 in a more suitable state.
• the oxidation of fuel in the N O X catalyst 9 supported on the filter 5 is easily promoted.
• the temperature rise performance of the filter 5, particularly the temperature rise performance of the upstream end face of the filter 5, can be improved, and the filter 5 can be raised to the target temperature more quickly.
• the adhesion of fuel to the filter 5 can be suppressed. Further, the fuel can be prevented from passing through the filter 5 without being oxidized in the NOx catalyst 9.
• the fuel when a back flow of the fuel vaporized in the oxidation catalyst 4 occurs, the fuel reaches the connection portion with one end of the bypass passage 17 in the exhaust passage 2 and bypasses. If it flows into the passage 17, the fuel may be released to the outside. Therefore, in this embodiment, when the exhaust flow rate reduction control is executed by increasing the flow rate of the exhaust gas flowing through the bypass passage 17, the bypass control valve 1 8 is synchronized with the fuel addition from the fuel addition valve 6. May be temporarily increased, and immediately thereafter, the bypass passage 17 may be blocked by the bypass control valve 18.
• the flow rate of the exhaust gas flowing through the bypass passage 17 is temporarily increased, and immediately after that, the flow rate of the exhaust gas flowing through the bypass passage 17 is increased. It becomes almost zero. Accordingly, the flow rate of the exhaust gas flowing into the oxidation catalyst when fuel is added from the fuel addition valve 6 can be reduced, and the backflow fuel flowing into the bypass passage 17 can be suppressed. As a result, the release of fuel to the outside can be suppressed.
• the target exhaust gas flow rate V gast when the target exhaust gas flow rate V gast is set, the fuel vaporized and backflowed in the oxidation catalyst 4 does not reach the connection portion of the exhaust passage 2 with one end of the bypass passage 17.
• the target exhaust flow rate V gast may be set as the value.
• Such a target exhaust flow rate V g ast can be calculated based on the distance from the connection portion of the exhaust passage 2 to one end of the bypass passage 17 to the oxidation catalyst 4 and the fuel expansion speed V f e X. This also suppresses the backflow of fuel flowing into the bypass passage 17.
• the exhaust flow rate reduction control may be performed by a control other than the control for increasing the flow rate of the exhaust gas flowing through the bypass passage 17.
• the filter regeneration control routine in this case will be described based on the flowchart shown in FIG. This routine is obtained by adding S 2 06 to the routine shown in FIG. Therefore, only S 2 06 will be described, and description of other steps will be omitted.
• This routine is stored in advance in the ECU 10 and is repeatedly executed at predetermined intervals during operation of the internal combustion engine. In this routine, the ECU 10 proceeds to S 2 0 6 after S 1 0 5. In S 2 06, the ECU 10 closes the bypass control valve 18 and closes the bypass passage 17. Thereafter, ECU 10 proceeds to S 1 0 6.
• the ECU 10 performs exhaust gas flow reduction control by a control other than the control for increasing the flow rate of the exhaust gas flowing through the bypass passage 17, and reduces the flow rate of the exhaust gas flowing into the oxidation catalyst 4. Decrease to the target exhaust flow rate V gast.
• the acid catalyst 4 may have an outer diameter smaller than the inner diameter of the exhaust passage 2. That is, the cross-sectional area of the oxidation catalyst 4 in the direction perpendicular to the flow direction of the exhaust gas may be smaller than the cross-sectional area of the exhaust passage 2 in the direction perpendicular to the flow direction of the exhaust gas.
• exhaust gas flows between the outer peripheral surface of the oxidation catalyst 4 and the inner peripheral surface of the exhaust passage 2.
• the fuel when the fuel is injected from the fuel injection hole of the fuel addition valve 6, the fuel is disposed so that the upstream end face of the oxidation catalyst 4 is positioned during the spraying of the fuel formed in a conical shape.
• the addition valve 6 and the oxidation catalyst 4 are installed (in Fig. 5, the shaded area represents the fuel spray).
• the flow rate of the exhaust gas flowing into the oxidation catalyst 4 is originally smaller than when all the exhaust gas flowing into the filter 5 passes through the oxidation catalyst 4. For this reason, when the fuel reaches the oxidation catalyst 4 and vaporizes to expand, the fuel tends to cause a back flow.
• the fuel addition valve 6 is arranged close to the oxidation catalyst 4 so that the fuel injection hole faces the upstream end face of the oxidation catalyst 4 has been described as an example.
• the fuel addition valve 6 may be installed at any position as long as at least a part of the fuel added from the fuel addition valve 6 reaches the oxidation catalyst 4 in a liquid state.
• NO X reduction control that releases and reduces NO X stored in the NOx catalyst 9 or SO X poisoning recovery control that releases and reduces SO X stored in the NO X catalyst 9 is used.
• exhaust flow rate reduction control may be executed in the same way as when performing filter regeneration control.
• fuel addition is performed by the fuel addition valve 6 that lowers the air-fuel ratio of the ambient atmosphere of the NO X catalyst 9.
• the fuel addition by the fuel addition valve 6 is performed to raise the temperature of the N Ox catalyst 9 and lower the air-fuel ratio of the ambient atmosphere of the NOx catalyst 9.
• the reducing agent addition valve is installed at a position where at least a part of the reducing agent added to the exhaust gas in the exhaust passage upstream of the upstream catalyst reaches the upstream catalyst in a liquid state.
• the reducing agent can be supplied in a suitable state by the exhaust gas purification device provided in the exhaust passage downstream of the upstream catalyst.

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• General Engineering & Computer Science (AREA)
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• 2007
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