WO2006067900A1 - エンジンの排気浄化装置 - Google Patents
エンジンの排気浄化装置 Download PDFInfo
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- WO2006067900A1 WO2006067900A1 PCT/JP2005/017244 JP2005017244W WO2006067900A1 WO 2006067900 A1 WO2006067900 A1 WO 2006067900A1 JP 2005017244 W JP2005017244 W JP 2005017244W WO 2006067900 A1 WO2006067900 A1 WO 2006067900A1
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- abnormality
- detected
- abnormality determination
- concentration
- predetermined
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- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- 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
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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- 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
- B01D53/9495—Controlling the catalytic process
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- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
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- 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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
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- 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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- 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
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
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- 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
- F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
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- 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
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0421—Methods of control or diagnosing using an increment counter when a predetermined event occurs
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- 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
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
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- 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
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1818—Concentration of the reducing agent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
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- 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
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- 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 relates to an exhaust purification device for an engine, and more particularly, to a technology for purifying nitrogen oxide, which also discharges engine power, using ammonia as a reducing agent.
- the following SCR (Selective Catalytic Reduction) device is used to purify air pollutants that exhaust engine power, particularly nitrogen oxides in the exhaust (hereinafter referred to as “NOx”) by post-processing.
- NOx nitrogen oxides in the exhaust
- a device for injecting an aqueous solution of ammonia or a precursor thereof into an engine exhaust passage is installed, and NOx and this ammonia are reacted on the catalyst using the injected ammonia as a reducing agent, and NOx is reduced and purified. To do.
- urea which is an ammonia precursor
- urea is stored in a tank in the form of an aqueous solution, and the urea water supplied to the tank is exhausted during actual operation.
- SCR device that injects ammonia into a passage and generates ammonia by hydrolysis of urea using exhaust heat (Patent Document 1).
- Patent Document 1 Japanese Patent Application Publication No. 2000-027627 (paragraph number 0013) Disclosure of Invention
- a urea sensor is installed in the urea water tank, and the actual concentration of urea (hereinafter simply referred to as ⁇ NOX ''). It is practically important to reflect the concentration of urea in the control of the engine and the SCR system.
- a urea sensor a heater and a resistance temperature detector are placed in an insulated state, and based on the electrical resistance value of the resistance temperature detector, focusing on the heat transfer characteristics of urea water according to the urea concentration.
- a device for detecting the actual concentration of urea has been developed (see Japanese Patent Application Publication No. 2001-228004).
- the applicant of the present application has conducted exhaust gas purification of an engine that employs this temperature-sensitive urea sensor.
- the Japanese Patent Application No. 2003-366737 has already been disclosed.
- the urea concentration is detected by the urea sensor, and when a high concentration exceeding the normal range is detected, it is determined that the remaining amount of urea water is insufficient.
- a lower concentration is detected, it is determined that the concentration of water is abnormal, assuming that the urea water is in a water or a dilute state near it, and when any of these determinations is made, Measures such as stopping water injection will be taken.
- the concentration is adopted as a deterministic value to detect the low concentration.
- the reliability of the concentration obtained is to be ensured (Figs. 7 and 9 of the previous application).
- the present invention provides an exhaust purification device for an engine.
- An apparatus according to the present invention is an engine exhaust purification device that adds NOx reducing agent to engine exhaust to reduce NOx in the exhaust, and is a NOx reducing agent added to exhaust or its
- the tank is configured to store a precursor in the form of an aqueous solution, and a predetermined state parameter relating to the aqueous solution is detected based on the thermal characteristics of the aqueous solution stored in the tank, and the detected state parameter is A predetermined abnormality related to the aqueous solution is detected when in an abnormal area other than a predetermined area defined as a normal area, and after the abnormality is detected, a predetermined fixed condition is detected. Anomaly judgment is made when the case is established.
- the first abnormality is detected when the detected state parameter is in the first area in the abnormal area, while the detected second state area is different from the first area in the abnormal area.
- the second abnormality is detected when the second abnormality is detected, and the first abnormality determination is made in relation to the detection of the first abnormality, while the second abnormality determination is made in relation to the detection of the second abnormality.
- the first abnormality is detected, when the second abnormality is detected because the detected state parameter is directly transferred to the first area force and the second area, the second abnormality is detected for a predetermined period from the detection of the second abnormality. Maintain the first abnormality determination.
- the present invention there is a lag until a predetermined definite condition is established between the detection of the state parameter in the abnormal region and the abnormality determination determined in association therewith.
- the second abnormality is detected when the second abnormality is detected because the detected state parameter is directly transferred to the first region force and the second region. Since the first abnormality determination is maintained for a predetermined period from the detection of this, it is possible to avoid the erroneous determination of being normal due to this lag.
- FIG. 1 shows a configuration of an engine according to an embodiment of the present invention.
- FIG. 6 Flow chart of concentration detection 'abnormality determination routine
- FIG. 1 shows a configuration of an automobile engine (hereinafter referred to as “engine”) 1 according to an embodiment of the present invention.
- engine an automobile engine
- a direct injection type diesel engine is employed as the engine 1.
- An air cleaner (not shown) is attached to the introduction portion of the intake passage 11, and dust in the intake air is removed by the air cleaner.
- a compressor 12a of a variable nozzle type turbocharger 12 is installed in the intake passage 11, and the intake air is compressed and sent out by the compressor 12a.
- the compressed intake air flows into the surge tank 13 and is distributed to each cylinder by the hold unit.
- the cylinder head is provided with an injector 21 for each cylinder.
- the injector 21 operates in response to a signal from an engine control unit (hereinafter referred to as “engine C / U”) 51.
- engine C / U engine control unit
- the fuel delivered by a fuel pump (not shown) is supplied to the injector 21 via the common rail 22 and is injected into the combustion chamber by the injector 21.
- a turbine 12b of the turbocharger 12 is provided downstream of the hold section.
- the compressor 12a rotates.
- the movable vane 121 of the turbine 12b is connected to the actuator 122, and the angle is controlled by the actuator 122.
- an oxidation catalyst 32 Downstream of the turbine 12b, an oxidation catalyst 32, a NOx purification catalyst 33, and an ammonia catalyst 34 are installed in this order from the upstream side.
- the oxidation catalyst 32 is composed of hydrocarbons and monoxide in the exhaust gas.
- nitrogen monoxide (hereinafter referred to as “NO”) in the exhaust gas is converted to NOx mainly composed of nitrogen dioxide (hereinafter referred to as “N02”).
- NOx purification catalyst 33 reduces NOx and purifies it.
- ammonia as a reducing agent is added to the exhaust gas upstream of the NOx purification catalyst 33.
- urea as an ammonia precursor is stored as an aqueous solution.
- ammonia as urea, safety can be ensured.
- a urea water supply pipe 42 is connected to the tank 41 for storing urea water, and a urea water injection nozzle 43 is attached to the tip of the urea water supply pipe 42.
- the urea water supply pipe 42 is provided with a feed pump 44 and a filter 45 in order of upstream force.
- the feed pump 44 is driven by an electric motor 441.
- the electric motor 441 has a rotational speed controlled by a signal from an SCR control unit (hereinafter referred to as “SCR-CZU”) 61 and adjusts the discharge amount of the feed pump 44.
- a urea water return pipe 46 is connected to the urea water supply pipe 42 downstream of the filter 45.
- the urea water return pipe 46 is provided with a pressure control valve 47, which is configured so that excess urea water exceeding the specified pressure is returned to the tank 41.
- the injection nozzle 43 is an air assist type injection nozzle, and includes a main body 431 and a nozzle portion 432.
- a urea water supply pipe 42 is connected to the main body 431, while an air supply pipe 48 for supplying assisting air is connected.
- the air supply pipe 48 is connected to an air tank (not shown), and assist air is supplied to the air tank force.
- the nozzle section 432 is installed upstream of the NOx purification catalyst 33 so as to penetrate the casing of the NOx purification catalyst 33 and the ammonia catalyst 34 also with a side force.
- the injection direction of the nozzle part 432 is set toward the end face of the NOx purification catalyst 33 in a direction parallel to the flow of exhaust gas.
- urea water When urea water is injected, urea in the injected urea water is hydrolyzed by exhaust heat, and ammonia is generated.
- the generated ammonia acts as a NOx reducing agent on the NOx purification catalyst 33 and reduces NOx.
- Ammonia catalyst 34 does not contribute to NOx reduction.
- NOx purification catalyst 33 is for purifying the slip ammonia that has passed through. Since ammonia has a pungent odor, it is not preferable to release it as unpurified smoke.
- the oxidation reaction of NO on the oxidation catalyst 32, the hydrolysis reaction of urea, the reduction reaction of NOx on the NOx purification catalyst 33, and the acid-oxidation reaction of slip ammonia on the ammonia catalyst 34 are the following (1) to (4 It is expressed by the formula.
- the force in which the NOx purification catalyst 33 and the ammonia catalyst 34 are built in a single housing may be configured as separate bodies.
- the exhaust passage 31 is connected to the intake passage 11 by an EGR pipe 35.
- An EGR valve 36 is interposed in the EGR pipe 35.
- the EGR valve 36 is connected to the actuator 361, and the opening degree is controlled by the actuator 361.
- a temperature sensor 71 for detecting the temperature of the exhaust gas before urea hydrogenation is installed between the acid catalyst 32 and the NOx catalyst 33. Downstream of the ammonia catalyst 34, a temperature sensor 72 for detecting the temperature of the exhaust after reduction and a NOx sensor 73 for detecting the concentration of NOx contained in the exhaust after reduction are installed. Further, a urea sensor 74 for detecting the concentration of urea contained in the urea water (corresponding to “state parameter”) is installed in the tank 41.
- the detection signals of the temperature sensors 71 and 72, the NOx sensor 73, and the urea sensor 74 are output to the SCR-CZ U61.
- the SCR-CZU61 calculates and sets the optimum urea water injection amount based on the input signal, and outputs a command signal corresponding to the set urea water injection amount of 43 nozzles.
- the SCR-CZU61 is connected to the engine CZU51 so as to be capable of bidirectional communication, and outputs the detected urea concentration to the engine CZU51.
- an idling switch, a start switch, a crank angle sensor, a vehicle speed sensor, an accelerator sensor, and the like are installed on the engine 1 side, and these detection signals are input to the engine CZU51.
- the engine CZU51 calculates the engine speed Ne based on the input signal of the crank angle sensor force.
- Engine CZU51 is used to control the injection of urea water, such as fuel injection amount Necessary information is output to SCR—CZU61.
- FIG. 2 shows the configuration of the urea sensor 74.
- the urea sensor 74 has a configuration similar to that of the flow meter described in the above publication No. 2001-228004, and detects the urea concentration based on the electric characteristic values of the two temperature sensing elements.
- the flow meter described in the aforementioned publication includes a first sensor element having a heater function and a second sensor element not having a heater function.
- the former first sensor element includes a heater layer and a resistance temperature sensor layer (hereinafter referred to as a “first resistance temperature sensor layer”) formed as an insulator on the heater layer. Consists of including.
- the latter second sensor element includes a temperature measuring resistance layer (hereinafter referred to as “second temperature measuring resistance layer”) as a temperature sensing element, but does not have a heater layer.
- Each sensor element is built in a housing made of resin and is connected to one end of a fin plate as a heat transfer body.
- a sensor element portion 741 of the urea sensor 74 is configured including the first and second sensor elements.
- the sensor element unit 741 is installed in the vicinity of the bottom surface in the tank 41, and is used by being immersed in urea water when detecting the concentration.
- Each fin plate 7414, 7415 penetrates the housing 7413 and is exposed in the tank 41.
- the circuit unit 742 is connected to the heater layer and the temperature measuring resistance layer of the first sensor element 7411 and the temperature measuring resistance layer of the second sensor element 7412.
- the heater layer is energized to heat the first resistance temperature detector layer, and each resistance of the heated first resistance temperature detector layer and the second resistance temperature detector layer that is not directly heated.
- the values Rnl and Rn2 are detected.
- the resistance thermometer layer has a characteristic that the resistance value changes in proportion to the temperature.
- the circuit unit 742 calculates the concentration Dn based on the detected Rnl and Rn2 as follows.
- the urea sensor 74 has a function of detecting the urea concentration and a function of determining the remaining amount of urea water.
- FIG. 3 shows the principle of density detection and remaining amount determination.
- Heating by the heater layer is performed by passing a heater driving current ih through the heater layer for a predetermined time ⁇ .
- the temperature difference between the resistance temperature detector layers changes according to the heat transfer characteristics using urea water as a medium. It changes according to the concentration. For this reason, the concentration D ⁇ can be calculated by converting the calculated ⁇ 12. Further, based on the calculated ⁇ 12, it can be determined whether or not the amount of urea water remaining in the tank 41 is insufficient.
- the first sensor element 7411 is configured such that the first temperature measuring resistance layer is brought into contact with urea water via the fin plate 7414.
- a measurement chamber for introducing urea water in the tank 41 may be formed, and the first temperature measuring resistance layer may be heated by a heater through the urea water in the measurement chamber.
- the first resistance temperature sensor layer and urea water are in direct contact.
- the operation of the SCR-CZU 61 according to the present embodiment is roughly as follows. That is, the SCR-CZU 61 performs detection permission determination (FIG. 4: detection permission routine), and actually detects the density Dn only when the density detection is permitted by this determination.
- detection permission determination FOG. 4: detection permission routine
- the concentration Dn is output.
- the detected concentration Dn is not within this range, it is determined that an abnormality relating to the remaining amount or concentration of urea water as the predetermined abnormality has occurred.
- concentration abnormality judgment regarding the concentration of urea water
- the SCR-CZU 61 when determining each abnormality, adds the error counters CNTc and CNTe as a “confirmation condition” by a predetermined value for each abnormality detection, and this error counter CNTc , When CNTe reaches the predetermined value CNTclim, CNTelim, the actual abnormality is judged (Fig. 6: Concentration detection 'abnormality judgment routine). When any of these abnormality determinations is made, the SCR—CZU61 outputs a signal to stop the injection of urea water to the injection nozzle 43 (FIG. 8: urea water injection control). routine).
- FIG. 4 is a flowchart of the detection permission routine. This routine is started when the idle switch is turned on, and then repeated every predetermined time. This routine allows or prohibits the detection of concentration Dn.
- the idle switch signal SWign is read and it is determined whether or not SWign is 1. When it is 1, it is determined that the idle switch is turned on, and the process proceeds to S102.
- the start switch signal SWstr is read and it is determined whether or not SWstr is 1.
- SWstr it is determined that the start switch is on and the engine 1 is being started, and the routine proceeds to S103 in order to make a permission determination. This is because when the engine 1 is started, a considerable amount of time has passed since the last stop, and the urea water is stationary in the tank 41, and the probability is high. If not 1, proceed to S105.
- the detection interval INT is reset to zero.
- the permission determination flag Fdtc is set to 1 and the permission determination is made.
- INT INT + 1
- INT INT + 1
- S106 it is determined whether the INT after counting up has reached a predetermined value INT1.
- INT1 it is assumed that the detection interval necessary for detecting the concentration Dn is secured, and the process proceeds to S103, and when INT1 is not reached, the necessary detection interval is secured. Proceed to S107 to make a prohibition decision.
- FIG. 5 is a flowchart of the stillness determination routine. This routine is repeated every predetermined time. By this routine, it is determined whether or not the urea water is stationary in the tank 41, and a stationary determination flag Fstb corresponding to the determination result is set. The set Fstb is reflected in the concentration detection 'abnormality determination routine (Fig. 6).
- S202 it is determined whether or not the read NE has decreased below a predetermined idle determination rotational speed NEidle. If it has decreased below NEidle, proceed to S203. If not, proceed to S206.
- VSP1 eg, 0
- VSP1 eg, 0
- Predetermined value VSP1 is not limited to 0; It is also possible to set the maximum value of the vehicle speed that can be controlled. Even if the vehicle is not completely stopped, when it is guaranteed that the vehicle speed will be somewhat low and no large deceleration will occur, the vibration of urea water in the tank 41 will be attenuated, and it will also be the force to proceed to the stationary state. .
- the stationary determination flag Fstb is set to 0, assuming that the urea water is not stationary.
- the process proceeds to S209, and when not reached, the process proceeds to S206.
- the quiet time TIM1 should be changed according to the deceleration at the time of stopping, and it should be set to a larger value as the deceleration is larger. This is because when the vehicle stops suddenly, the urea water shakes immediately after stopping, and it takes a long time to stop.
- the stationary determination flag Fstb is set to 1, and it is determined that the urea water is stationary.
- FIG. 6 is a flowchart of the concentration detection / abnormality determination routine. This routine is executed by the SCR-CZU 61 and the circuit unit 742 when the permission determination flag Fdtc is set to 1. S302 and 303 are processes performed by the circuit unit 742. By this routine, the concentration D n is detected, and a predetermined abnormality relating to the urea water is detected and determined.
- the permission determination flag Fdtc is read, and it is determined whether or not the read Fdtc is 1. Only when it is 1, proceed to S302.
- the heater layer of the urea sensor 74 is energized, and the first resistance temperature layer is heated directly and the second resistance temperature resistance layer is indirectly heated using urea water as a medium. To do.
- Concentration Dn is detected.
- Concentration Dn is detected by detecting the resistance values Rnl and Rn2 of each heated resistance thermometer layer and calculating the temperature difference ⁇ Tmp 12 between the resistance thermometer layers according to the detected difference between Rnl and Rn2.
- the calculated ⁇ Tmp12 is converted to the concentration Dn.
- the detected Dn includes a first value D1 and a second value D2 larger than the first value. It is determined whether or not it is within a predetermined range (corresponding to “normal region”) as upper and lower limits. When it is within this range, the process proceeds to S316, and when it is not within this range, the process proceeds to S305.
- a predetermined range corresponding to “normal region”
- the predetermined value D3 is set to an intermediate value between the output Dn obtained when the urea sensor 74 is in urea water and the output Dn obtained when the urea sensor 74 is in air.
- the predetermined value D3 may be set to a value equal to the force D2 set to a value different from D2 (that is, larger than D2).
- the concentration Dn obtained when the urea water is at rest is to reflect the high reliability of the abnormality in the abnormality judgment because the variation in heat transfer characteristics due to the stirring of the urea water is small.
- the concentration abnormality determination flag is determined that the urea water is in water or a dilute force close to it, or a different aqueous solution different from the urea water is stored in the tank 41.
- Set Fcnc to 1.
- different concentration abnormality determination flags are set for the case where water is filled in the tank 41 and the case where the urea water is diluted, and the concentration Dn and the fourth value D4 (which is smaller than D1) For example, it may be possible to distinguish between abnormalities in each case by comparing 0)!
- the remaining amount error counter CNTe is set to a value corresponding to the stationary determination flag Fstb.
- concentration error counter CNTc this is to reflect the high reliability of the concentration Dn obtained when the urea water is at rest.
- the concentration abnormality determination flag Fcnc is set to 0.
- a remaining amount abnormality determination is made that the amount of urea water remaining in the tank 41 is less than a predetermined amount (for example, the tank 41 is empty), and a remaining amount abnormality determination flag is set.
- a predetermined amount for example, the tank 41 is empty
- each abnormality judgment flag Fcnc, Femp is set to zero.
- each error counter CNTe, CNTe is reset to 0.
- FIG. 7 is a flowchart of the stop control routine. This routine is executed when the idle switch is turned off.
- the idling switch signal SWign is read and it is determined whether or not the SWign force ⁇ . When it is 0, it is determined that the idle switch has been turned off, and the process proceeds to S402.
- each error counter CNTe, CNTe and each abnormality determination flag Fcnc, Femp are written as the calculation information.
- the urea water injection amount is set.
- the urea water injection amount is set by calculating the basic injection amount according to the fuel injection amount of the engine 1 and the output of the NOx sensor 73, and correcting the calculated basic injection amount with the concentration Dn.
- the basic injection amount is corrected to decrease.
- the basic injection amount Apply an increase correction to.
- an operation signal corresponding to the set urea water injection amount is output to the injection nozzle 43.
- the remaining amount warning light installed on the control panel of the driver's seat is operated to make the driver recognize that the remaining amount of urea water is insufficient.
- the concentration warning light installed on the control panel is activated to make the driver recognize that the concentration is too low.
- urea water injection is stopped.
- the urea water injection is stopped when each abnormality determination is made.
- the NOx emission amount from the engine 1 to the engine CZU51 is determined.
- a signal may be output to reduce itself or to limit the output of engine 1.
- the amount of the exhaust gas recirculated through the EGR pipe 35 is changed to a value larger than the normal time other than the abnormality determination
- the output characteristics of the engine 1 with respect to the accelerator operation are made different from the normal times, for example, the fuel injection amount with respect to the accelerator opening is changed to a smaller value than the normal time.
- the urea sensor 74 constitutes a “detection device”
- the SCR-CZU 61 constitutes a “calculation device”.
- the processing of S304, 305 of the flow chart shown in FIG. 6 functions as the “abnormality detection unit”
- the processing of S306, 307, 311 and 312 of the flowchart Figure 5 [Processing of S201 to 205, 20 7, 208 in the flowchart shown here functions as an “abnormality determination unit”
- processing of S504 in the flowchart shown in FIG. 8 functions as an “addition control unit” Realize.
- Fig. 9 is a time chart showing the operation of the SCR-CZU61.
- first abnormality determination corresponding to "first abnormality determination”
- time t2 the remaining amount abnormality determination
- each error counter CNTc, CNTe and each abnormality determination Indicates the movement of flags Fcnc and Femp.
- the urea water is generated due to vibration during traveling or shaking during stopping. It is possible to relax the influence of the concentration Dn detected with variation by stirring.
- the urea water injection amount based on the concentration Dn, the urea water can be injected without excess or deficiency.
- the error counters CNTc and CNTe are adopted for both the concentration abnormality determination and the remaining amount abnormality determination.
- the error counter CNTc is used only for one of the abnormality determinations (e.g., concentration abnormality determination that is likely to cause erroneous determination), and the other abnormality determination (i.e., remaining amount abnormality determination) is predetermined. It may be immediately reduced when the concentration Dn in the region A exceeding the range B is detected.
- error counters CNTc and CNTe that are incremented by predetermined values a to d each time an abnormality in concentration or remaining amount is detected are employed to ensure the accuracy of abnormality determination.
- the number of times is simply adopted, and after the detected density Dn shifts from outside the areas A and C to the areas A and C, a predetermined percentage of the density Dn detected for a predetermined number of times is used. If the combination is in this region (for example, if the concentration Dn in the region is detected continuously for a predetermined number of times), an abnormality determination may be made.
- the force that generates ammonia by the hydrolysis of urea is not particularly specified as a catalyst for this hydrolysis.
- a hydrolysis catalyst may be installed upstream of the NOx purification catalyst 33.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05785954.8A EP1830040B1 (en) | 2004-12-24 | 2005-09-20 | Engine exhaust purification apparatus |
US11/812,871 US20070266697A1 (en) | 2004-12-24 | 2007-06-22 | Exhaust emission purifying apparatus for engine |
US12/793,604 US7842267B2 (en) | 2004-12-24 | 2010-06-03 | Exhaust emission purifying apparatus for engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-373889 | 2004-12-24 | ||
JP2004373889A JP3686672B1 (ja) | 2004-12-24 | 2004-12-24 | エンジンの排気浄化装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/812,871 Continuation US20070266697A1 (en) | 2004-12-24 | 2007-06-22 | Exhaust emission purifying apparatus for engine |
Publications (1)
Publication Number | Publication Date |
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WO2006067900A1 true WO2006067900A1 (ja) | 2006-06-29 |
Family
ID=35004100
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PCT/JP2005/017244 WO2006067900A1 (ja) | 2004-12-24 | 2005-09-20 | エンジンの排気浄化装置 |
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Country | Link |
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US (2) | US20070266697A1 (ja) |
EP (1) | EP1830040B1 (ja) |
JP (1) | JP3686672B1 (ja) |
CN (1) | CN100529366C (ja) |
WO (1) | WO2006067900A1 (ja) |
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2007
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US8017080B2 (en) | 2005-11-11 | 2011-09-13 | Ngk Spark Plug Co., Ltd. | Liquid state detecting apparatus |
EP2072772A4 (en) * | 2006-10-12 | 2013-05-29 | Nissan Diesel Motor Co | ENGINE EXHAUST GAS CLEANER |
WO2009030346A1 (de) * | 2007-08-28 | 2009-03-12 | Daimler Ag | Betriebs- und diagnoseverfahren für ein scr-abgasnachbehandlungssystem |
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RU2563595C1 (ru) * | 2011-08-31 | 2015-09-20 | Сканиа Св Аб | Способ и система для детектирования кристаллов восстанавливающего агента в системе scr последующей обработки выхлопных газов |
Also Published As
Publication number | Publication date |
---|---|
CN101087936A (zh) | 2007-12-12 |
CN100529366C (zh) | 2009-08-19 |
US20070266697A1 (en) | 2007-11-22 |
US7842267B2 (en) | 2010-11-30 |
EP1830040A4 (en) | 2010-10-20 |
JP3686672B1 (ja) | 2005-08-24 |
JP2006177317A (ja) | 2006-07-06 |
EP1830040B1 (en) | 2019-02-20 |
US20100236220A1 (en) | 2010-09-23 |
EP1830040A1 (en) | 2007-09-05 |
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