WO1997013058A1 - APPAREIL ET PROCEDE DE DETECTION DE LA DETERIORATION DU CATALYSEUR ANTI-NOx D'UN MOTEUR DIESEL - Google Patents
APPAREIL ET PROCEDE DE DETECTION DE LA DETERIORATION DU CATALYSEUR ANTI-NOx D'UN MOTEUR DIESEL Download PDFInfo
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- WO1997013058A1 WO1997013058A1 PCT/JP1996/002857 JP9602857W WO9713058A1 WO 1997013058 A1 WO1997013058 A1 WO 1997013058A1 JP 9602857 W JP9602857 W JP 9602857W WO 9713058 A1 WO9713058 A1 WO 9713058A1
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- WIPO (PCT)
- Prior art keywords
- catalyst
- diesel engine
- deterioration
- nox catalyst
- sensor
- Prior art date
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Classifications
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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
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
-
- 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]
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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
- F01N2550/02—Catalytic activity of catalytic converters
-
- 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
- F01N2560/023—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting HC
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
-
- 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 apparatus and a method for accurately detecting a decrease in catalyst performance, which reduces exhaust emissions from a diesel engine. Background technology
- Japanese Patent Application Laid-Open No. 4-330314 is known as a catalytic exhaust purification device for a diesel engine that reduces and decomposes ⁇ ⁇ contained in exhaust gas of a diesel engine.
- a copper zeolite-based ⁇ ⁇ ⁇ catalyst provided in an exhaust path of a diesel engine and a ⁇ ⁇ ⁇ catalyst provided in an exhaust path on the upstream side of the ⁇ catalyst detect the degree of hydrocarbon hydrocarbons in the exhaust gas.
- a fuel sensor that is provided in an exhaust path upstream of the hydrocarbon sensor and that sprays fuel to the exhaust path so that the concentration of hydrocarbons in the exhaust gas falls within a predetermined range based on the value detected by the hydrocarbon sensor. Means.
- the fuel is appropriately sprayed from the fuel spraying means into the exhaust path based on the detected value of the hydrocarbon concentration, and the hydrocarbon concentration in the exhaust gas is maintained in a predetermined range.
- the fuel sprayed from the fuel spraying means acts as a hydrocarbon-based reducing agent, and activates a copper zeolite-based catalyst in cooperation with oxygen contained in diesel engine exhaust gas. As a result, it is proposed that the reduction of ⁇ ⁇ in exhaust gas is promoted.
- a hydrocarbon sensor is provided on the upstream side of the catalyst, and based on the detection value of the hydrocarbon sensor, the fuel is supplied from the fuel spraying means to the exhaust path so as to keep the degree of hydrocarbon within a predetermined range. Spraying.
- NOX in the exhaust gas is appropriately reduced and purified, but the NOx catalyst deteriorates with time due to use, and the N ⁇ purification performance decreases.
- the NOx purification performance of a NOx catalyst is improved by increasing the amount of reducing hydrocarbons added.
- An object of the present invention is to provide an apparatus and a method for accurately detecting a decrease in the performance of a NOx catalyst that reduces NOx emitted from a diesel engine.
- the first invention of the deterioration detection device according to the present invention is to supply fuel such as kerosene or the like as a reducing hydrocarbon in an exhaust pipe, and to reduce and purify exhaust NOx by a NOx catalyst in the exhaust pipe.
- a NOx catalyst deterioration detection device for a diesel engine a rotational speed sensor that measures the rotational speed of the diesel engine, a load sensor that detects the load of the diesel engine, and a NOx catalyst are installed behind the NOx catalyst.
- the condition from which the diesel engine is operating is detected based on the hydrocarbon sensor that detects the amount of hydrocarbons in the exhaust gas and the signals from these rotational speed sensors and load sensors.
- Degradation detection means for determining the degradation of the NOx catalyst based on the change over time in the amount of hydrocarbons in the exhaust gas discharged from the NOx catalyst .
- the second invention of the deterioration detection device is to supply fuel such as kerosene as a reducing hydrocarbon in an exhaust pipe, and to reduce and purify exhaust NOx by a NOx catalyst in the exhaust pipe.
- a rotation speed sensor that measures the rotation speed of the diesel engine
- a load sensor for detecting a load of the diesel E down gin
- a hydrocarbon sensor disposed in the rear of the NO x catalyst
- N Ox catalyst deterioration detecting means for determining the deterioration of the N Ox catalyst.
- the third invention of the deterioration detection device is to supply fuel such as kerosene or the like as a reducing hydrocarbon in an exhaust pipe, and to reduce and purify exhaust NOx by a NOx catalyst in the exhaust pipe.
- a rotation speed sensor that measures the rotation speed of the diesel engine
- a load sensor that detects the load of the diesel engine
- a predetermined distance behind the NOx catalyst in the exhaust pipe are arranged.
- Oxidation catalyst provided, an oxidation catalyst front temperature sensor disposed between the NOx catalyst and the oxidation catalyst, an oxidation catalyst rear temperature sensor disposed behind the oxidation catalyst, and a rotation speed sensor.
- the condition from which the diesel engine is operating is detected based on the signal from the load sensor.
- Reduction based on, and is configured deterioration detecting means Toka et seeking degradation of N Ox catalyst.
- the fourth invention of the deterioration detection apparatus is a diesel engine that supplies fuel such as kerosene or the like as a reducing hydrocarbon into an exhaust pipe, and reduces and purifies the exhaust NOx using a NOx catalyst in the exhaust pipe.
- a rotational speed sensor that measures the rotational speed of the diesel engine
- a load sensor that detects the load on the diesel engine, and a specified distance behind the NOx catalyst in the exhaust line Oxidation catalyst
- an oxidation catalyst front temperature sensor disposed between the N Ox catalyst and the oxidation catalyst
- an oxidation catalyst rear temperature sensor disposed behind the oxidation catalyst
- a rotational speed sensor that measures the rotational speed of the diesel engine
- a load sensor that detects the load on the diesel engine, and a specified distance behind the NOx catalyst in the exhaust line Oxidation catalyst
- an oxidation catalyst front temperature sensor disposed between the N Ox catalyst and the oxidation catalyst
- an oxidation catalyst rear temperature sensor disposed behind the oxidation catalyst
- the temperature difference between the two temperature sensors which is determined by the diesel engine operating conditions at that time, is calculated and calculated.
- the temperature difference is compared with the actual temperature difference to determine deterioration of the NOx catalyst.
- the fifth invention which is based on any one of the first invention and the fourth invention of the deterioration detection device, is a reduction device provided in the exhaust pipe between the diesel engine and the NOx catalyst when detecting the deterioration of the NOx catalyst.
- Deterioration detection means for outputting a command to increase the amount of reducing agent fuel supplied to the NOx catalyst from the agent fuel adding nozzle is provided.
- the first invention of the deterioration detection method fuel such as kerosene is supplied to an exhaust pipe as a reducing hydrocarbon, and exhaust NOx is reduced and purified by a NOx catalyst in the exhaust pipe.
- the operating condition of the diesel engine is detected from the rotational speed and load of the diesel engine, and the NOx catalyst is detected when the operating condition satisfies a predetermined condition. It consists of determining the degradation of this NOx catalyst based on the change over time in the amount of hydrocarbons in the exhaust gas.
- the second invention of the deterioration detection method is to supply a fuel such as kerosene as a reducing hydrocarbon into an exhaust pipe, and to use a NOx catalyst in the exhaust pipe to purify exhaust NOx through a NOx catalyst of a diesel engine.
- the operating condition of the diesel engine is detected from the rotation speed and load of the diesel engine, and the fluctuation range of the operating condition is within a specified value for a predetermined time or more.
- the amount of hydrocarbons discharged from the NOx catalyst determined by the operating conditions of the diesel engine at that time is calculated and obtained, and the obtained amount of hydrocarbons and the amount of hydrocarbons measured by the hydrocarbon sensor are calculated. In comparison, it consists of determining the degradation of the NOx catalyst.
- a third invention is the deterioration detecting method, the fuel such as kerosene and Kyoawase in the exhaust pipe as the reducing for hydrocarbons, NOx catalyst diesel engine that reduces and purifies exhaust N0 X by the NOx catalyst of the exhaust pipe in
- the temperature in front of and behind the oxidation catalyst disposed at a predetermined interval behind the NOx catalyst in the exhaust pipe 2 are measured, and the diesel engine is operated. It consists of detecting conditions and determining the deterioration of the NOx catalyst based on the change over time of the temperature difference when the specified conditions are satisfied.
- a fourth invention of the deterioration detection method is a NOx catalyst for a diesel engine which supplies fuel such as kerosene as a reducing hydrocarbon into an exhaust pipe and reduces and purifies exhaust NOx by a NOx catalyst in the exhaust pipe.
- the temperature in front of and behind the oxidation catalyst arranged at a predetermined interval behind the NOx catalyst in the exhaust line is measured, and the conditions under which this diesel engine is operating are determined. If it is detected that the fluctuation range of the operating conditions is within the specified value for more than a predetermined time, the temperature difference before and after the oxidation catalyst determined by the operating conditions of the diesel engine at that time is calculated. It consists of comparing the calculated temperature difference with the actual temperature difference to determine the deterioration of the NOx catalyst.
- the fifth invention which is mainly based on the first force of the deterioration detection method and the force of the fourth invention, is provided in the exhaust pipe between the diesel engine and the NOx catalyst when detecting the deterioration of the NOx catalyst.
- the amount of the reductant fuel supplied to the NOx catalyst from the reductant fuel addition nozzle is increasing.
- the amount of hydrocarbon emission is grasped over time, and based on this, a decrease in the performance of the NOx catalyst is accurately detected. are doing.
- the amount of hydrocarbons discharged from the NOx catalyst determined by the operating conditions is calculated and obtained. By comparing the amount of hydrocarbons measured and the amount of hydrocarbons actually measured, the deterioration of the NOx catalyst performance is accurately detected.
- an oxidation catalyst is arranged behind the NOx catalyst in the exhaust pipe, and the unreacted hydrocarbons in the exhaust gas undergo catalytic combustion in the oxidation catalyst, causing a difference in temperature before and after the oxidation catalyst. Since this temperature difference is correlated with the amount of hydrocarbons when the operating conditions of the diesel engine are the same, the amount of unreacted hydrocarbons discharged from the NOx catalyst can be detected, and the deterioration of the NOx catalyst is required. .
- the third aspect of the apparatus and method over time to grasp the temperature difference when the diesel engine has fully a predetermined operating condition, accurate performance degradation of the NO x catalyst which was based on Has been detected.
- the temperature difference before and after the oxidation catalyst determined by the operating conditions is calculated, and this calculation is performed. It is compared with the actual temperature difference between the temperature difference, and accurately detects a reduction performance of the NO x catalyst.
- a fifth aspect of the apparatus and method Oite from the first to any of the configuration of the fourth aspect of the invention, upon detection of a decrease in performance of the NOx catalyst, and outputs a command from the deterioration detection means, NO x catalyst The amount of reductant fuel supplied to the fuel cell is increasing. As a result, even when the remaining amount of the reducing agent fuel is small, the amount of hydrocarbons discharged from the NOx catalyst can be accurately measured, and the deterioration of the NOx catalyst performance can be detected more accurately.
- FIG. 1 is a configuration explanatory view of a device for detecting deterioration of a NOx catalyst of a diesel engine according to a first embodiment of the present invention.
- FIG. 2 is a flowchart of a first detection method of the NOx catalyst deterioration detection method.
- Figure 3 is a Furochiya one bets of the second detection method deterioration detecting method of the NO x catalyst.
- FIG. 4 is a configuration explanatory view of a device for detecting deterioration of a NOx catalyst of a diesel engine according to a second embodiment of the present invention.
- Figure 5 is a Furochiya one bets of a third method of detecting the deterioration detection method of the NO x catalyst.
- Figure 6 is a flowchart of the fourth method of detecting NOx catalyst deterioration.
- Figure 7 is a Furochiya one bets fifth detecting method of deterioration detecting method of the NO x catalyst.
- an exhaust pipe 2 from a diesel engine 1 is provided with a NOx catalyst 3 for purifying NOx in exhaust gas. Further, the diesel engine 1 is provided with a rotational speed sensor 4 for detecting the rotational speed of the engine, and a load sensor 5 for measuring a fuel injection amount and detecting a load on a lever linked to an accelerator pedal (not shown). ing.
- a reducing agent fuel addition nozzle 7 for adding the reducing agent fuel to the exhaust gas is provided in the exhaust pipe 2 between the diesel engine 1 and the NOx catalyst 3.
- the reducing agent fuel addition nozzle 7 is supplied with fuel from a pump 8 via a flow control valve 9.
- the flow control valve 9 is controlled in accordance with a use condition of the diesel engine 1 by a command from a controller described later, and supplies a predetermined reducing agent fuel to the reducing agent fuel addition nozzle 7.
- the NOx catalyst deterioration detecting device 10 of this embodiment is provided in the exhaust pipe 2 behind the NOx catalyst 3.
- the NOx catalyst deterioration detection device 10 includes a hydrocarbon sensor 11 and a deterioration detection unit 12 as deterioration detection means.
- the deterioration detection unit 12 is configured by a controller, and receives signals from the rotation speed sensor 4, the injection amount detection sensor 5, and the hydrocarbon sensor 11 to detect deterioration of the NOx catalyst 3.
- step 3 the signals from the rotation speed sensor 4 and the load sensor 5 degrade the operating condition of the diesel engine 1 based on the rotation speed N of the diesel engine 1 and the load Ps acting on the diesel engine 1. Read the detection unit 12.
- step 4 the deterioration detecting unit 12 determines whether the read rotational speed N and the load Ps fall within a predetermined set range or not. That is, if the rotational speed N is in N a ⁇ N ⁇ N b and the load Ps is in P, ⁇ Ps ⁇ P b , Has been determined.
- step 4 If it is determined in step 4 that the rotation speed N and the load Ps are not within the predetermined ranges, the process returns to step 2. In Step 4, if the rotation speed N and the load Ps are within the predetermined ranges, go to Step 5.
- step 6 the force that has been continuously operated within the predetermined set value t for a predetermined time tc and the force or no force are determined.
- Step 6 if not elapsed operating time t force "predetermined time tc (t ⁇ t c), the process returns to step 3.
- Step 6 if the elapsed operating time t force, 'the predetermined time tc (t ⁇ t c) is in line step 7 to step 7, with di one Zeruenjin 1 force predetermined operating condition, but a predetermined time tc only when the reaction is continuously operated in the NO x catalyst 3 becomes a stable state, reads the discharge amount of hydrocarbon HC, ea k after NOx catalyst 3.
- Steps 3 to 7 are performed in the same way as the first flow.
- step 8 as in the first flow, the judgment is made based on the value of the variable S.
- step 1 or greater than the predetermined value HC than the discharge amount of hydrocarbon HC S emission amount of hydrocarbons HC leak reference after the NOx catalyst 3 is determined whether. That is, HCea. ⁇ HCs> HC is calculated by the deterioration detection unit 12.
- Step 1 1 Smaller in Step 1 1 (NO), the process proceeds to step 1 2, the deterioration detecting unit 1 2 Ganmanyuomikuron chi catalyst 3 is determined that the non-deteriorated ", the flow returns to step 2. If it is larger in step 11 (YES), the process proceeds to step 13, where the deterioration detection unit 12 determines that “the NOx catalyst 3 has deteriorated”, and ends the deterioration detection routine.
- step 11 the process proceeds to step 13 where the deterioration detection unit 12 determines that “the NOx catalyst 3 has deteriorated”, and ends the deterioration detection routine.
- step 23 the rotational speed N of the diesel engine 1 and the operating condition of the load Ps acting on the engine are further input to the deterioration detecting unit 12 based on signals from the rotational speed sensor 4 and the load sensor 5. .
- step 24 the rotational speed N of the diesel engine 1 read in step 23 and the load P s acting on this engine, and the reference rotational speed N of the diesel engine 1 read in step 22.
- the deterioration detector 12 determines whether or not the difference 5 from the reference load P so acting on the engine is within a predetermined range. That is,
- step 24 If it is larger (NO) in step 24, return to step 21. If it is smaller in step 24 (YES), go to step 25.
- step 26 it is determined whether or not the time t during which the operation is continuously performed within the predetermined fluctuation range exceeds the predetermined value tc.
- step 26 If the operation time t does not exceed the predetermined value tc in step 26 (t ⁇ t c ), the process returns to step 23. In step 26, if the operation time t force ⁇ the predetermined value t c has passed (t ⁇ t c ), go to step 27.
- step 27 the HC leak amount HC leak after the NOx catalyst 3 is read.
- step 28 the operating conditions of step 22, ie, the reference engine speed N, are set. And the reference exhaust hydrocarbon amount HC so after the NOx catalyst 3 at the reference load p so acting on the engine is read from the engine operation map stored in the deterioration detection unit 12.
- This engine operation map is a map in which the reference amount of hydrocarbons HC so can be calculated from the rotational speed N on the horizontal axis and the load Ps on the vertical axis.
- Step 2 9 the discharge amount of hydrocarbon that is actually discharged after N_ ⁇ x catalyst 3
- step 29 If it is smaller in step 29 (NO), the process proceeds to step 30, the deterioration detection unit 12 determines that “the NOx catalyst 3 is not deteriorated”, and returns to step 21. If it is larger in step 29 (YES), the process proceeds to step 31, where the deterioration detection unit 12 determines that “ ⁇ catalyst 3 has deteriorated” and ends the deterioration detection routine.
- step 30 the deterioration detection unit 12 determines that “the NOx catalyst 3 is not deteriorated”, and returns to step 21. If it is larger in step 29 (YES), the process proceeds to step 31, where the deterioration detection unit 12 determines that “ ⁇ catalyst 3 has deteriorated” and ends the deterioration detection routine.
- the NOx catalyst deterioration detecting device 20 is provided between the NOx catalyst 3 and the NOx catalyst 3 and the NOx catalyst 3 and the NOx catalyst 3 in the exhaust pipe 2 which are disposed at a predetermined interval. Also, an oxidation catalyst front temperature sensor 22 disposed in front of the oxidation catalyst 21, an oxidation catalyst rear temperature sensor 23 disposed behind the oxidation catalyst 21, and both temperature sensors 2 2, 2 It consists of a deterioration detection unit 24 that calculates the temperature difference from the signal from 3 and determines the deterioration of the NOx catalyst.
- Steps 1 to 6 are performed in the same manner as the first detection method.
- the oxidation catalyst front temperature sensor 22 measures a temperature Ta a in front of the oxidation catalyst 21 (hereinafter referred to as a front temperature Ta a), and sends the measured value to the deterioration detection unit 24.
- step 44 the judgment is made based on the value of the variable S as in the first flow.
- step 4 7 the temperature difference T a determined by measuring the before and after the oxidation catalyst 2 1, greater setpoint T ⁇ or than the temperature difference Ts of the reference, and determined whether. Immediate Chi, are determined by calculating the T a -Ts> T C in degradation detection unit 2 4.
- step 47 If it is small in step 47 (NO), the process proceeds to step 48, where the deterioration detection unit 24 determines that “the catalyst 3 is not deteriorated” and returns to step 2.
- step 47 If it is larger at step 47 (YES), the process proceeds to step 49, where the deterioration detection unit 24 determines that “the NOx catalyst 3 has deteriorated” and ends the deterioration detection routine.
- step 49 a fourth detection method of the deterioration detection method of the NOx catalyst 3 will be described according to a flowchart shown in FIG. Note that the same steps as those of the second detection method of the deterioration detection method are denoted by the same step numbers, and description thereof is omitted.
- Steps 21 to 26 are performed in the same manner as the second detection method.
- step 51 the oxidation catalyst front temperature sensor 22 measures the front temperature ⁇ ,, of the oxidation catalyst 21 and sends the measured value to the deterioration detection unit 24.
- step 52 the oxidation catalyst rear temperature sensor 23 measures the rear temperature T bb of the oxidation catalyst 21 , and sends the measured value to the deterioration detection unit 24.
- step 54 the operating conditions of step 2 Reference speed N. And the reference temperature difference T s around the oxidation catalyst 21 at the reference load P so acting on this engine. Is read from the engine operation map stored in the deterioration detector 24.
- This engine operation map is a map from which a reference temperature difference T so can be calculated from the rotational speed N on the horizontal axis and the load P s on the vertical axis.
- step 5 of 5 than the temperature difference Tso actually measured and calculated temperature difference T a force ⁇ reference read from engine map of the oxidation catalyst 2 1 back and forth, or large heard or not more than the predetermined value T c determined are doing. That is, it determined by calculating the T a -Tso> T c in the deterioration detector 2 4.
- step 55 If it is small in step 55 (NO), the process proceeds to step 56, where the deterioration detection unit 24 determines that “the NO x catalyst 3 is not deteriorated”, and returns to step 21.
- step 55 If it is larger in step 55 (YES), the process proceeds to step 57, in which the deterioration detection unit 24 determines that “the NOx catalyst 3 has deteriorated”, and ends the deterioration detection routine.
- step 57 a fifth detection method of the deterioration detection method of the NOx catalyst 3 will be described with reference to a flowchart shown in FIG. The same steps as those in the first detection method of the deterioration detection method are denoted by the same step numbers, and description thereof will be omitted.
- the present invention is applied to the first detection method of the deterioration detection method is described, but the same can be applied to the second to fourth detection methods.
- Steps 1 to 6 are performed in the same manner as the first detection method.
- step 61 the deterioration detection unit 12 outputs a command to the flow control valve 9, and is larger than the amount q of the reducing agent fuel added to the exhaust gas suitable for the operation condition in step 3 (for example, k times).
- a predetermined amount k X q of the reductant fuel is supplied from the reductant fuel addition nozzle 7 to the NOx catalyst 3 in the exhaust pipe 2.
- step 62 the signals from the rotation speed sensor 4 and the load sensor 5 degrade the rotation speed N of the diesel engine 1 and the load Ps acting on this engine at that time (when the amount of added reducing agent fuel kxq is supplied). Read it into the detector 1 and 2.
- step 63 the rotational speed N of the loaded diesel engine 1 and The load P s force acting on this engine is judged by the deterioration detector 12 as to whether or not it is within a predetermined set range. That is, the rotation speed N is N a ⁇ N ⁇
- the force at N b and the force at which the load P S is at Pa ⁇ Ps ⁇ P b are determined.
- step 63 if the rotational speed N and the load P s force are not within the predetermined set ranges (NO), go to step 64, and reduce the reductant fuel addition amount kxq to the operation amount Return to Q and return to step 2.
- step 63 the rotational speed N and load P s, if contained in a range that is a predetermined set (YES), proceeds to step 65.
- step 66 it is determined whether or not the force has passed the time t force predetermined value tc during the continuous operation within the predetermined fluctuation range.
- step 66 if the operating time t has not exceeded the predetermined value t c (t ⁇ t c), the process returns to step 62. In step 66, if the operation time t has passed the predetermined value t c (t ⁇ tc) goes to the first detecting method and the same step 7.
- step 7 when the reaction in the N Ox catalyst 3 is in a stable state under the predetermined operating conditions, ⁇ The HC leak amount HC leak after the catalyst 3 is read.
- Steps 8 to 13 are performed in the same way as the first detection method
- the hydrocarbon sensor 11 can accurately measure the amount of HC discharged from the NOx catalyst 3 HC leak , and can more accurately detect the performance degradation of the NOx catalyst.
- INDUSTRIAL APPLICABILITY The present invention is useful as an apparatus and a method for accurately detecting a decrease in the performance of a NOx catalyst that reduces NOx emitted from a diesel engine. As a result, the NOx catalyst can be properly regenerated and the emission of NOx gas into the atmosphere can be reduced.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/051,160 US6079203A (en) | 1995-10-02 | 1996-10-01 | Apparatus and method for detecting deterioration of NOx catalyst in diesel engine |
DE19681596T DE19681596T1 (de) | 1995-10-02 | 1996-10-01 | Vorrichtung und Verfahren zum Erkennen einer Verschlechterung eines NO¶x¶-Katalysators in einem Dieselmotor |
GB9806354A GB2320581B (en) | 1995-10-02 | 1996-10-01 | Apparatus and method for detecting deterioration of NOx catalyst in diesel engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7/278350 | 1995-10-02 | ||
JP27835095A JP3852788B2 (ja) | 1995-10-02 | 1995-10-02 | ディーゼルエンジンのNOx 触媒の劣化検出装置およびその劣化検出方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997013058A1 true WO1997013058A1 (fr) | 1997-04-10 |
Family
ID=17596116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1996/002857 WO1997013058A1 (fr) | 1995-10-02 | 1996-10-01 | APPAREIL ET PROCEDE DE DETECTION DE LA DETERIORATION DU CATALYSEUR ANTI-NOx D'UN MOTEUR DIESEL |
Country Status (5)
Country | Link |
---|---|
US (1) | US6079203A (ja) |
JP (1) | JP3852788B2 (ja) |
DE (1) | DE19681596T1 (ja) |
GB (1) | GB2320581B (ja) |
WO (1) | WO1997013058A1 (ja) |
Cited By (1)
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EP0881367A1 (de) * | 1997-05-30 | 1998-12-02 | Volkswagen Aktiengesellschaft | Katalysatorsystem zur Entstickung von Abgasen bei Dieselbrennkraftmaschinen |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP5590640B2 (ja) * | 2007-08-01 | 2014-09-17 | 日産自動車株式会社 | 排気ガス浄化システム |
US7624628B2 (en) * | 2007-12-20 | 2009-12-01 | Southwest Research Institute | Monitoring of exhaust gas oxidation catalysts |
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WO2010093286A1 (en) * | 2009-02-12 | 2010-08-19 | Volvo Lastvagnar Ab | Method for operating an exhaust aftertreatment system and exhaust aftertreatment system |
US8156736B2 (en) * | 2009-05-28 | 2012-04-17 | GM Global Technology Operations LLC | Exhaust hydrocarbon injection control system and method |
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KR101406419B1 (ko) * | 2012-08-22 | 2014-06-13 | 현대자동차주식회사 | Doc 재생주기 결정방법 |
JP6401595B2 (ja) * | 2014-12-03 | 2018-10-10 | 日本碍子株式会社 | 触媒劣化診断方法 |
JP6374780B2 (ja) | 2014-12-03 | 2018-08-15 | 日本碍子株式会社 | 触媒劣化診断システムおよび触媒劣化診断方法 |
JP6408363B2 (ja) * | 2014-12-03 | 2018-10-17 | 日本碍子株式会社 | 触媒劣化診断方法 |
US10450934B2 (en) * | 2016-08-04 | 2019-10-22 | Mitsui Mining & Smelting Co., Ltd. | Catalyst deterioration detecting system and catalyst deterioration detecting method |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04109021A (ja) * | 1990-08-28 | 1992-04-10 | Honda Motor Co Ltd | 内燃エンジンの三元触媒の劣化検出装置 |
JPH05195756A (ja) * | 1992-01-21 | 1993-08-03 | Hino Motors Ltd | エンジンの排ガス浄化装置 |
JPH05312024A (ja) * | 1992-05-12 | 1993-11-22 | Mazda Motor Corp | 触媒の劣化検出装置 |
JPH07279651A (ja) * | 1994-04-12 | 1995-10-27 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JPH0861047A (ja) * | 1994-07-22 | 1996-03-05 | Robert Bosch Gmbh | 内燃機関の排気ガス路における触媒器の機能の正常性の監視法および監視装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5201802A (en) * | 1991-02-04 | 1993-04-13 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification system for an internal combustion engine |
JP2956257B2 (ja) * | 1991-04-30 | 1999-10-04 | いすゞ自動車株式会社 | ディーゼル機関の触媒式排気浄化装置 |
US5433074A (en) * | 1992-07-30 | 1995-07-18 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device for an engine |
US5367875A (en) * | 1992-12-07 | 1994-11-29 | Coltec Industries Inc | Automated catalytic reduction system |
SE9301344D0 (sv) * | 1993-04-22 | 1993-04-22 | Siemens-Elema Ab | Foerfarande och anordning foer att bestaemma volymen hos en baelgbehaallare foer medikament vid ett implanterbart infusionssystem |
US5584176A (en) * | 1994-12-23 | 1996-12-17 | Ford Motor Company | Engine control to achieve rapid catalyst warm-up |
-
1995
- 1995-10-02 JP JP27835095A patent/JP3852788B2/ja not_active Expired - Lifetime
-
1996
- 1996-10-01 GB GB9806354A patent/GB2320581B/en not_active Expired - Fee Related
- 1996-10-01 WO PCT/JP1996/002857 patent/WO1997013058A1/ja active Application Filing
- 1996-10-01 DE DE19681596T patent/DE19681596T1/de not_active Withdrawn
- 1996-10-01 US US09/051,160 patent/US6079203A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04109021A (ja) * | 1990-08-28 | 1992-04-10 | Honda Motor Co Ltd | 内燃エンジンの三元触媒の劣化検出装置 |
JPH05195756A (ja) * | 1992-01-21 | 1993-08-03 | Hino Motors Ltd | エンジンの排ガス浄化装置 |
JPH05312024A (ja) * | 1992-05-12 | 1993-11-22 | Mazda Motor Corp | 触媒の劣化検出装置 |
JPH07279651A (ja) * | 1994-04-12 | 1995-10-27 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JPH0861047A (ja) * | 1994-07-22 | 1996-03-05 | Robert Bosch Gmbh | 内燃機関の排気ガス路における触媒器の機能の正常性の監視法および監視装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0881367A1 (de) * | 1997-05-30 | 1998-12-02 | Volkswagen Aktiengesellschaft | Katalysatorsystem zur Entstickung von Abgasen bei Dieselbrennkraftmaschinen |
Also Published As
Publication number | Publication date |
---|---|
GB9806354D0 (en) | 1998-05-20 |
DE19681596T1 (de) | 1998-11-05 |
GB2320581B (en) | 1999-12-01 |
GB2320581A (en) | 1998-06-24 |
US6079203A (en) | 2000-06-27 |
JP3852788B2 (ja) | 2006-12-06 |
JPH0996215A (ja) | 1997-04-08 |
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