WO2022186368A1 - 制御装置および通知方法 - Google Patents
制御装置および通知方法 Download PDFInfo
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- WO2022186368A1 WO2022186368A1 PCT/JP2022/009301 JP2022009301W WO2022186368A1 WO 2022186368 A1 WO2022186368 A1 WO 2022186368A1 JP 2022009301 W JP2022009301 W JP 2022009301W WO 2022186368 A1 WO2022186368 A1 WO 2022186368A1
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- Prior art keywords
- regeneration
- temperature
- state
- engine
- exhaust gas
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 18
- 238000011069 regeneration method Methods 0.000 claims abstract description 209
- 230000008929 regeneration Effects 0.000 claims abstract description 208
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- 230000003647 oxidation Effects 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 10
- 230000009471 action Effects 0.000 claims abstract description 7
- 239000013618 particulate matter Substances 0.000 claims description 20
- 230000000694 effects Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 21
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 230000008569 process Effects 0.000 description 11
- 239000000446 fuel Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 5
- 238000000746 purification Methods 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000010485 coping Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0808—Diagnosing performance data
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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
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
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- G—PHYSICS
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- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0418—Methods of control or diagnosing using integration or an accumulated value within an elapsed period
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
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- 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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
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- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1466—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a soot concentration or content
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
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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 a control device and a notification method.
- This application claims priority to Japanese Patent Application No. 2021-034111 filed in Japan on March 4, 2021, the content of which is incorporated herein.
- Forced regeneration includes automatic regeneration, in which regeneration is automatically performed when certain conditions are met, and manual regeneration, in which regeneration is performed at an arbitrary timing by a driver's operation.
- automatic regeneration in which regeneration is automatically performed when certain conditions are met
- manual regeneration in which regeneration is performed at an arbitrary timing by a driver's operation.
- the working machine described in Patent Document 1 includes an exhaust purification device that collects particulate matter in the exhaust of a diesel engine with a filter and burns the collected particulate matter to regenerate the filter.
- regeneration determination means for determining that forced regeneration has failed when, for example, the exhaust temperature reaches below a threshold value indicating that regeneration is possible during forced regeneration of the filter, and forced regeneration failure by the regeneration determination means and an informing means for informing that the forced regeneration has failed when the number of times determined to have occurred reaches a predetermined threshold value or more.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control device and a notification method capable of notifying that there is a problem with the operating state during forced regeneration.
- one aspect of the present invention includes a filter that collects particulate matter in exhaust gas from an engine, and an oxidation catalyst that is provided upstream of the filter.
- the control device includes a regeneration state determination unit that notifies that there is a problem in the operating state of the engine.
- one aspect of the present invention includes a filter that collects particulate matter in engine exhaust, and an oxidation catalyst that is provided upstream of the filter, and the filter is regenerated by the action of the oxidation catalyst.
- the exhaust gas aftertreatment device when forced regeneration that forcibly raises the temperature of the exhaust gas is being executed, the number of times the exhaust gas temperature is estimated to be less than the light-off temperature for a predetermined time period or longer exceeds a predetermined threshold.
- This notification method includes the step of notifying when the value has been exceeded.
- FIG. 1 is a system diagram showing a configuration example of an engine control system according to an embodiment of the present invention
- FIG. 2 is a block diagram showing a configuration example of a control device 100 shown in FIG. 1
- FIG. 3 is a timing chart schematically showing an operation example of the control device 100 shown in FIG. 2
- FIG. FIG. 2 is a timing chart schematically showing an operation example of the engine control system shown in FIG. 1
- FIG. 3 is a flowchart showing an operation example of a regeneration target temperature reset unit 104 shown in FIG. 2
- FIG. 3 is a control block diagram showing a reproduction state determination unit 105 shown in FIG. 2.
- FIG. FIG. 3 is a flowchart showing an operation example of a reproduction state determination unit 105 shown in FIG. 2;
- FIG. FIG. 3 is a flowchart showing an operation example of a reproduction state determination unit 105 shown in FIG. 2;
- FIG. FIG. 3 is a flowchart showing an operation example of a reproduction state determination unit 105 shown in FIG
- FIG. 3 is a schematic diagram for explaining an operation example of a reproduction state determination unit 105 shown in FIG. 2;
- FIG. 3 is a schematic diagram for explaining an operation example of a reproduction state determination unit 105 shown in FIG. 2;
- FIG. 3 is a flowchart showing an operation example of a reproduction state determination unit 105 shown in FIG. 2;
- FIG. 3 is a schematic diagram for explaining an operation example of a reproduction state determination unit 105 shown in FIG. 2;
- FIG. 3 is a flowchart showing an operation example of a reproduction state determination unit 105 shown in FIG. 2;
- FIG. 1 is a system diagram showing a configuration example of an engine control system 10 as one configuration example of an exhaust gas purification system according to each embodiment of the present invention.
- An engine control system 10 shown in FIG. 1 includes an engine 1, an exhaust pipe 3, a DPF device 5 as a structural example of an exhaust aftertreatment device, a monitor 8, a control device 100, and an HC dozer 7.
- . 1 and the like mainly show the configuration related to the forced regeneration of the DPF device 5 in the engine control system 10 (or the control device 100) of the present embodiment, and the configuration related to other functions such as fuel injection control. are appropriately omitted from the drawing.
- the engine 1 is one configuration example of an internal combustion engine, and is a multi-cylinder diesel engine in this embodiment.
- the exhaust pipe 3 exhausts the exhaust of the engine 1 to the atmosphere through the DPF device 5 .
- the DPF device 5 is a device for purifying particulate matter (PM (Particulate Matter)) contained in the exhaust gas of the engine 1.
- PM particulate Matter
- DOC Diesel Oxidation Catalyst
- DPF Diesel Particulate Filter
- the DPF device 5 regenerates the DPF 52 by the action of the DOC 51 .
- the DPF device 5 removes PM by oxidizing the PM collected downstream with nitrogen dioxide converted by the DOC 51 provided upstream of the DPF 52 into carbon dioxide.
- the DPF device 5 also includes a DOC inlet temperature sensor 94 that detects the exhaust temperature at the inlet of the DOC 51, a DOC outlet temperature sensor 95 that detects the exhaust temperature at the outlet of the DOC 51, and a differential pressure between the inlet and outlet of the DPF 52. It has a pair of pressure sensors 96 and 97 . Detection values of DOC inlet temperature sensor 94 , DOC outlet temperature sensor 95 , and pressure sensors 96 and 97 are output to control device 100 .
- the HC dozer 7 is an exhaust pipe fuel injection device that injects fuel (HC) into the exhaust pipe 3 upstream of the DOC 51 (hereinafter referred to as HC dosing, etc.). controlled.
- the monitor 8 has, for example, a display panel and an input panel, and functions as a display device and an input device. A corresponding signal is output to the control device 100 .
- forced regeneration DPF regeneration operation
- the temperature of the exhaust gas and the temperature of the DOC 51 are forced to rise.
- Forced regeneration is performed, for example, by post-injection for mixing fuel with the exhaust in the engine 1, or by post-injection and HC (fuel) dosing (injection) into the exhaust pipe 3 upstream of the DPF device 5 by the HC dozer 7.
- HC is burned inside the DOC 51 arranged upstream of the DPF 52 to increase the temperature of the DPF 52 .
- the forced regeneration (DPF regeneration operation) is performed in a normal operating state (without forcibly fixing the engine speed when a certain condition is met).
- stationary manual regeneration when the exhaust gas temperature does not rise sufficiently in the normal operating state and the temperature of the DPF device 5 cannot be stably controlled to the target temperature, the normal operation is stopped with the permission of the user, and the DPF device is operated. This is the control to recover the performance of 5.
- the control device 100 In the stationary manual regeneration, the control device 100 first uses the monitor 8 to indicate to the user that the stationary manual regeneration can be performed and to issue a request to the user to perform the stationary manual regeneration. On the other hand, when the user uses the monitor 8 to issue an instruction to execute stationary manual regeneration, the control device 100 fixes the engine speed at a certain speed, raises the exhaust temperature, and executes forced regeneration. do.
- FIG. 2 is a block diagram showing a configuration example of the control device 100 shown in FIG.
- FIG. 3 is a timing chart schematically showing an operation example of the control device 100 shown in FIG.
- FIG. 4 is a timing chart schematically showing an operation example of the engine control system 10 shown in FIG.
- FIG. 5 is a flow chart showing an operation example of the regeneration target temperature reset unit 104 shown in FIG.
- FIG. 6 is a control block diagram showing the reproduction state determination section 105 shown in FIG.
- FIG. 7 is a flow chart showing an operation example of the reproduction state determination unit 105 shown in FIG. 8 and 9 are schematic diagrams for explaining an operation example of the reproduction state determination section 105 shown in FIG.
- FIG. 10 is a flow chart showing an operation example of the reproduction state determination unit 105 shown in FIG.
- the control device 100 shown in FIG. 2 can be configured using, for example, a computer such as a microcomputer, and peripheral circuits and peripheral devices of the computer. As a functional configuration composed of a combination of software and software, a plurality of blocks shown in FIG. 2 are provided.
- the control device 100 includes a fuel injection control section 101 , a forced regeneration start determination section 102 , a forced regeneration control section 103 , a regeneration target temperature reset section 104 and a regeneration state determination section 105 .
- control device 100 acquires the rotation speed (rotational speed) of the engine 1 based on the output of a rotation speed sensor (not shown), and estimates the amount of soot deposited in the DPF device 5 based on the operating state and the like. have a function.
- the fuel injection control unit 101 for example, according to an instruction from the forced regeneration control unit 103, controls a fuel injection device (not shown) of the engine 1 and performs, for example, post-injection during forced regeneration.
- the forced regeneration start determination unit 102 requests the start of forced regeneration when the differential pressure exceeds a predetermined threshold value.
- the state in which the start of forced regeneration is requested by the forced regeneration start determination unit 102 is defined as a state in which regeneration is requested.
- a state in which there is a reproduction request is, for example, when the reproduction state determination unit 105 determines that the reproduction is completed, or determines that the reproduction cannot be completed and ends the reproduction. set to none.
- the forced regeneration control unit 103 When there is a regeneration request, the forced regeneration control unit 103 performs temperature control during forced regeneration as follows. That is, the forced regeneration control unit 103 controls, for example, post-injection of the engine 1 and HC by the HC dozer 7 so that the DOC outlet temperature matches a predetermined regeneration target temperature that is sequentially calculated as shown in FIG. The temperature is controlled by feeding back the DOC outlet temperature by controlling the dosing amount. However, HC is dosed (injected) after the DOC inlet temperature reaches the temperature at which the catalyst contained in the DOC 51 is activated (light-off temperature, eg, about 250° C.).
- FIG. 3 schematically shows changes in the regeneration target temperature, with the horizontal axis representing time and the vertical axis representing the DOC outlet temperature.
- the forced regeneration control unit 103 changes the regeneration target temperature by dividing the regeneration state into the following five stages.
- the reproduction request is made at time t11 (there is no reproduction state until time t11).
- the playback state is (1) before starting playback (playback state: none), (2) ToWarmUp state until reaching the WarmUp Target temperature (about 350°C), (3) WarmUp state when reaching the WarmUp Target temperature, (4) ) the ToTarget state until reaching the Target temperature (approximately 500° C., the final target temperature); and (5) the Target state in which the Target temperature is reached.
- the ToWarmUp state is a regeneration state in which the maximum value of the regeneration target temperature is the WarmUp Target temperature (eg, 350°C).
- the regeneration target temperature is calculated so that the initial value is the actual DOC outlet temperature at time t11 when the forced regeneration is started, and increases to the WarmUp target temperature by time t12 after a predetermined time.
- the playback state from time t11 to time t12 is the ToWarmUp state.
- the WarmUp state is a regeneration state in which the regeneration target temperature is kept constant at the WarmUp Target temperature (eg, 350°C).
- the playback state from time t12 to time t13 after a predetermined time is the WarmUp state.
- the ToWarmUp state and the WarmUp state may be collectively referred to as the WarmUp state.
- the time from time t11 to time t13 is, for example, about 2 minutes for one temperature rise.
- the ToTarget state is a regeneration state in which the maximum value of the regeneration target temperature is Taeget temperature -50°C (eg, 450°C).
- the regeneration target temperature is calculated so that the warmup target temperature (for example, 350° C.) is the initial value, and the target temperature increases to ⁇ 50° C. by time t14 after a predetermined period of time.
- the playback state from time t13 to time t14 is the ToTarget state.
- the target state is a regeneration state in which the maximum value of the regeneration target temperature is the Taeget temperature (eg, 500°C).
- the Taeget temperature is set to ⁇ 50° C. (eg, 450° C.) as an initial value, and the Taeget temperature is increased with a predetermined slope to the Taeget temperature (eg, 500° C.).
- a target temperature is calculated.
- the playback state after time t14 is the Target state.
- FIG. 4 schematically shows an example of temperature control, with the horizontal axis representing time and the vertical axis representing DOC inlet temperature, DOC outlet temperature, or HC dosing amount.
- the horizontal axis representing time
- the vertical axis representing DOC inlet temperature, DOC outlet temperature, or HC dosing amount.
- Forced regeneration is started at time t1, and the DOC inlet temperature and the DOC outlet temperature rise, for example, by post-injection control.
- the DOC inlet temperature reaches the HC dosing start temperature (for example, the light-off temperature or the light-off temperature with a predetermined margin)
- HC dosing is started.
- the DOC outlet temperature is feedback-controlled so as to become the final value of the regeneration target temperature (Target temperature) in the Target state.
- dt1 corresponds to the amount of increase in engine exhaust temperature
- dt2 corresponds to the amount of temperature increase due to combustion in the DOC 51 due to fuel supply.
- the regeneration target temperature reset unit 104 has a function of resetting the regeneration target temperature to the regeneration target temperature in the ToWarmUp state or the WarmUp state under certain conditions.
- the regeneration target temperature reset unit 104 receives extreme feedback and the DOC exit
- the regeneration state by the forced regeneration control unit 103 is reset to the ToWarmUp state or the WarmUp state so that the temperature does not become excessive.
- the condition is "regeneration target temperature - DOC outlet temperature is 200°C or higher”.
- FIG. 5 shows an operation example of the regeneration target temperature reset unit 104.
- FIG. The processing shown in FIG. 5 is executed when there is a reproduction request.
- the regeneration target temperature reset unit 104 first acquires the regeneration target temperature, the DOC outlet temperature, and the regeneration state (step S101).
- the regeneration target temperature reset unit 104 determines whether or not forced regeneration is in progress (step S102). If forced regeneration is in progress ("Y" in step S102), the regeneration target temperature reset unit 104 determines whether the regeneration state is the ToTarget state or the Target state (step S103).
- the regeneration target temperature resetting unit 104 determines whether the time period in which the regeneration target temperature ⁇ DOC outlet temperature>200° C. is longer than or equal to a certain period of time. It is determined whether or not (step S104).
- the regeneration target temperature resetting unit 104 resets the regeneration target temperature and warms up the regeneration state.
- An instruction is issued to the forced regeneration control unit 103 to restart from the state (ToWarmUp state or WarmUp state), and the temperature rise reset count is incremented by 1 (step S105).
- the temperature rise reset count is the number of times the regeneration state has been reset from the ToTarget state or Target state to the ToWarmUp state or WarmUp state (when the DOC inlet temperature is written represents the number of times the DOC outlet temperature was retried from a temperature estimated to be below the off temperature to a temperature estimated to be above the light off temperature.
- step S103 if the regeneration state is not the ToTarget state and is not the Target state (“N” in step S103), or if the time period in which the regeneration target temperature ⁇ DOC outlet temperature>200° C. is not equal to or longer than a certain period of time (step If "N" in S104), the regeneration target temperature resetting unit 104 executes the processes after step S101 again.
- regeneration target temperature reset unit 104 initializes the number of temperature rise resets to 0 (step S106). 5 ends.
- the regeneration state determination unit 105 determines the state of the temperature control when the DOC outlet temperature cannot reach the Taeget temperature during forced regeneration, and informs the user of the determined result, cause, coping method, and the like. Notice.
- cases in which the DOC outlet temperature cannot reach the Taeget temperature during forced regeneration are classified into three cases: inefficient regeneration (1), inefficient regeneration (2), and incomplete regeneration.
- Inefficient regeneration (1) The exhaust temperature (DOC inlet temperature) has reached the light-off temperature, but the DOC 51 catalyst has deteriorated, so the DOC 51 does not burn HC and the DOC outlet temperature is the Target temperature (for example 500° C.).
- Inefficient regeneration (2) Depending on the operating conditions, the DOC inlet temperature frequently fluctuates over the light-off temperature, so HC injection is frequently stopped and the DOC outlet temperature does not reach the target temperature.
- Incomplete regeneration Due to engine failure, the exhaust temperature does not reach the light-off temperature (250°C), HC injection cannot be performed, and the DOC outlet temperature does not reach the Target temperature.
- the regeneration state determination unit 105 calculates the DOC inlet temperature, the DOC outlet temperature, the regeneration state, and the number of times of resetting of the regeneration target temperature, thereby performing a more detailed failure detection. state, etc. Further, the playback state determination unit 105 notifies a predetermined notification destination of, for example, a failure code as information representing the determination result, or notifies information representing a warning to the user.
- the predetermined notification destination is, for example, an external server that remotely manages the operating state of the engine control system 10, or an external notification destination registered in advance on a WEB system or the like.
- the playback state determination unit 105 may use the monitor 8 to notify the user of certain information based on the determination result.
- the processing shown in FIG. 7 is executed when there is a reproduction request.
- the reproduction state determination unit 105 first acquires the DOC inlet temperature, the DOC outlet temperature, and the number of temperature rise resets (step S201).
- the reproduction state determination unit 105 determines whether or not two hours or more have passed since the reproduction was requested (step S202). Two hours in this case is an example of a second determination time longer than the first determination time.
- step S202 If it has been two hours or more since the regeneration was requested ("Y" in step S202), the regeneration state determination unit 105 determines that regeneration has not been completed, and regeneration is started due to engine failure. A notification is sent to the effect that it will not be performed (step S210), followed by a request for stationary manual regeneration (step S211). In step S211, for example, a response to the stationary manual regeneration request is waited for a certain period of time, and if there is no response and the DOC outlet temperature does not rise, a further warning is issued, and then the processing shown in FIG. 7 ends.
- the regeneration state determination unit 105 determines the number of times the regeneration has been restarted from the WarmUp state based on the number of temperature rise resets. It is determined whether or not it is X times or more (X is an arbitrary natural number) (step S203). If the number of times the playback has been restarted from WarmUp is X times or more (“Y” in step S203), the playback state determination unit 105 determines that the playback is inefficient (2), and issues a warning or the like. is performed (step S207), and it is determined whether or not the reproduction completion condition is reached (step S205).
- the regeneration completion condition is, for example, when the estimated PM deposition amount estimated from the pressure difference is the initial value, and the PM deposition amount estimated from the temperature change of the regeneration control is equal to or less than a predetermined threshold value, the DOC outlet For example, the time for which the temperature reaches the Target temperature -50° C. is longer than or equal to a predetermined threshold value. If the regeneration completion condition is met (“Y” in step S205), the regeneration state determination unit 105 terminates the forced regeneration (sets regeneration request to no) (step S206), as shown in FIG. End the process. On the other hand, if the reproduction completion condition is not met (“N” in step S205), the reproduction state determination unit 105 executes the processes after step S201 again.
- the reproduction state determination unit 105 determines the time during which the DOC outlet temperature is equal to or lower than the Target temperature ⁇ 50° C. during HC dosing. is one hour or more (step S204).
- “during HC dosing” means that the DOC inlet temperature continues to reach the HC dosing start temperature (for example, the light-off temperature or the light-off temperature with a predetermined margin). be. Also, one hour in this case is an example of the first determination time.
- step S204 If the time during which the DOC outlet temperature is equal to or lower than the Target temperature -50°C during HC dosing is one hour or more ("Y" in step S204), the regeneration state determination unit 105 determines that inefficient regeneration (1) Then, the DOC 51 is notified that there is a possibility of failure (step S208). setting) (step S206), and the process shown in FIG. 7 is terminated.
- the regeneration state determination unit 105 determines whether the regeneration completion condition has been reached. It is determined whether or not (step S205). If the regeneration completion condition is met (“Y” in step S205), the regeneration state determination unit 105 terminates the forced regeneration (sets regeneration request to no) (step S206), as shown in FIG. End the process. On the other hand, if the reproduction completion condition is not met (“N” in step S205), the reproduction state determination unit 105 executes the processes after step S201 again.
- FIG. 8 summarizes the determination conditions, determination results, coping methods, and the like by the playback state determination unit 105.
- the judgment condition is that the time during which the DOC outlet temperature is below the Target temperature -50°C during HC dosing is 1 hour or more.
- Engine 1 is in good condition.
- the state of the DPF device 5 is that the DOC 51 may have deteriorated. There is no problem in the driving condition of the vehicle equipped with the engine 1.
- the countermeasure is to request a stationary manual regeneration. If the stationary manual regeneration does not solve the problem, trouble shooting related to the DPF device 5 should be performed. Troubleshooting includes, for example, DOC efficiency measurement, DOC drying operation, and the like.
- the DOC efficiency can be obtained by a formula of (amount of heat converted by DOC/amount of heat of HC injected for regeneration)*100.
- the DOC dry operation is an operation for removing unburned fuel and soot adhering to the DOC inlet by controlling the temperature of the engine exhaust gas and not injecting HC for regeneration.
- the determination condition is that the number of times regeneration has been restarted from the WarmUp state is X times or more. There is no problem in the state of the engine 1 and the state of the DPF device 5 .
- the operating condition of the vehicle is that the load fluctuation is large and the DOC inlet temperature is frequently below 250°C.
- Countermeasures include recommending stationary manual regeneration and warning that the vehicle is in a state where load fluctuations are large (for example, recommending that the vehicle be changed to a state in which load fluctuations are small). (notice of
- the judgment condition is that the time since the reproduction was requested is 2 hours or more.
- the state of the engine includes a state in which a failure has occurred, and a state in which the engine is left in a low idle state (an idling state at the minimum speed at which the engine does not stop). If left in the low idling state, the temperature may not reach the light-off temperature and forced regeneration cannot be started. ), the cause can be identified. There is no problem in the state of the DPF device 5 and the driving state of the vehicle.
- the countermeasure is a stationary manual regeneration request. If the stationary manual regeneration does not solve the problem, troubleshoot the engine (VGT (variable displacement turbo) failure, air leakage, etc.).
- FIG. 9 shows a state in which forced regeneration is requested at time t21, one hour has passed since time t21 at time t22, and two hours have passed since time t21 at time t23.
- inefficient regeneration (1) the exhaust temperature continues to reach the light-off temperature, and HC dosing continues.
- inefficient regeneration (2) the exhaust temperature intermittently reaches the light-off temperature and HC dosing is performed intermittently.
- incomplete regeneration the exhaust temperature has not continuously reached the light-off temperature, and HC dosing has been continuously stopped.
- the exhaust temperature reaches the light-off temperature before time T20 of time t23, and HC dosing is performed before time T20 of time t23.
- the regeneration completion condition is not satisfied before reaching t23.
- the reproduction state determination unit 105 when forced regeneration is interrupted or interrupted will be described.
- the processing shown in FIG. 10 is executed when there is a reproduction request.
- the regeneration state determination unit 105 first acquires estimated values of the DOC outlet temperature, the engine speed, and the soot deposit amount (step S301).
- the reproduction state determination unit 105 determines whether or not the reproduction stop condition is satisfied (step S302).
- the reproduction stop condition is, for example, engine stop (disconnection) by key-off, reproduction prohibition (interruption) by the user, and the like.
- step S302 If the reproduction stop condition is satisfied ("Y" in step S302), the reproduction state determination unit 105 repeats the processing of steps S301 and S302 until the reproduction stop condition is no longer met.
- step S302 the regeneration state determination unit 105 instructs the forced regeneration control unit 103 to execute forced regeneration (step S303), and the regeneration is completed. It is determined whether or not the conditions are met (step S304). If the regeneration completion condition is met (“Y” in step S304), the regeneration state determination unit 105 terminates the forced regeneration (sets regeneration request to no) (step S305), as shown in FIG. End the process. On the other hand, if the reproduction completion condition is not met ("N” in step S304), the reproduction state determination unit 105 executes the processes after step S301 again.
- the control device 100 includes the DPF 52 (filter) that collects particulate matter in the exhaust gas of the engine 1 and the DOC 51 (oxidation catalyst) provided upstream of the DPF 52.
- the DPF device 5 exhaust gas aftertreatment device
- the temperature of the exhaust gas is light off for a predetermined time or more.
- a regeneration state determination unit 105 is provided for notifying that there is a problem in the operating state of the engine 1 when the number of times the temperature is estimated to be below the temperature exceeds a predetermined threshold value (X times). According to this configuration, it is possible to notify that there is a problem in the operating state or the like during forced regeneration.
- the regeneration state determination unit 105 further determined that the forced regeneration was not completed even after the first determination time (one hour) or more had elapsed during which the temperature of the exhaust gas was estimated to be equal to or higher than the light-off temperature. In this case, it is possible to notify that the DOC 51 (oxidation catalyst) may be out of order.
- the regeneration state determination unit 105 further determines that the forced regeneration has not been completed even after a second determination time (two hours) longer than the first determination time has elapsed since the forced regeneration was started. If so, it is possible to notify that there is a possibility of engine failure.
- the exhaust gas aftertreatment device is configured by the DPF device 5, but for example, an SCR device (Selective Catalytic Reduction device (selective catalytic reduction device)) may be provided further downstream, or an SCR device may be provided downstream, for example.
- a device may be provided to omit the DPF 52 from the DPF device 5 .
- part or all of the program executed by the control device 100 can be distributed via a computer-readable recording medium or a communication line.
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Abstract
Description
本願は、2021年3月4日に日本に出願された特願2021-034111号について優先権を主張し、その内容をここに援用する。
図1は、本発明の各実施形態に係る排気ガス浄化システムの一構成例としてのエンジン制御システム10の構成例を示すシステム図である。図1に示すエンジン制御システム10は、エンジン1と、排気管3と、排気ガス後処理装置の一構成例としてのDPF装置5と、モニタ8と、制御装置100と、HCドーザ7とを備える。なお、図1等では、本実施形態のエンジン制御システム10において(あるいは制御装置100について)、DPF装置5の強制再生に係る構成を主に示し、燃料噴射制御等の他の機能に係る構成については図示を適宜省略している。
図2~図10を参照して、図1に示す制御装置100の構成例および動作例について説明する。図2は、図1に示す制御装置100の構成例を示すブロック図である。図3は、図2に示す制御装置100の動作例を模式的に示すタイミング図である。図4は、図1に示すエンジン制御システム10の動作例を模式的に示すタイミング図である。図5は、図2に示す再生ターゲット温度リセット部104の動作例を示すフローチャートである。図6は、図2に示す再生状態判定部105を示す制御ブロック図である。図7は、図2に示す再生状態判定部105の動作例を示すフローチャートである。図8~図9は、図2に示す再生状態判定部105の動作例を説明するための模式図である。図10は、図2に示す再生状態判定部105の動作例を示すフローチャートである。
以上のように、本実施形態によれば、制御装置100は、エンジン1の排気中の粒子状物質を捕集するDPF52(フィルタ)と、DPF52の上流に設けられたDOC51(酸化触媒)とを有し、DOC51の作用によってDPF52を再生するDPF装置5(排気ガス後処理装置)において、排気の温度を強制的に上昇させる強制再生が実行されている場合、排気の温度が所定時間以上ライトオフ温度未満になったと推定される回数が所定のしきい値(X回)を超えたとき、エンジン1の運転状態に問題がある旨を通知する再生状態判定部105を備える。この構成によれば、強制再生中の運転状態等に問題があることを通知することができる。
Claims (4)
- エンジンの排気中の粒子状物質を捕集するフィルタと、前記フィルタの上流に設けられた酸化触媒とを有し、前記酸化触媒の作用によって前記フィルタを再生する排気ガス後処理装置において、前記排気の温度を強制的に上昇させる強制再生が実行されている場合、
前記排気の温度が所定時間以上ライトオフ温度未満になったと推定される回数が所定のしきい値を超えたとき、
前記エンジンの運転状態に問題がある旨を通知する再生状態判定部を
備える制御装置。 - 前記再生状態判定部は、さらに、前記排気の温度がライトオフ温度以上であると推定される時間が第1判定時間以上経過しても前記強制再生が完了していないと判定した場合、前記酸化触媒の故障の可能性がある旨を通知する
請求項1に記載の制御装置。 - 前記再生状態判定部は、さらに、前記強制再生が開始されてからの時間が、前記第1判定時間より長い第2判定時間以上経過しても前記強制再生が完了していないと判定した場合、前記エンジンの故障の可能性がある旨を通知する
請求項2に記載の制御装置。 - エンジンの排気中の粒子状物質を捕集するフィルタと、前記フィルタの上流に設けられた酸化触媒とを有し、前記酸化触媒の作用によって前記フィルタを再生する排気ガス後処理装置において、前記排気の温度を強制的に上昇させる強制再生が実行されている場合、
前記排気の温度が所定時間以上ライトオフ温度未満になったと推定される回数が所定のしきい値を超えたとき、
その旨を通知するステップを
含む通知方法。
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DE112022000316.2T DE112022000316T5 (de) | 2021-03-04 | 2022-03-04 | Steuereinheit und Benachrichtigungsverfahren |
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WO2017131086A1 (ja) * | 2016-01-29 | 2017-08-03 | 三菱重工エンジン&ターボチャージャ株式会社 | 排ガス処理装置の再生制御装置 |
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JP5123229B2 (ja) | 2009-03-02 | 2013-01-23 | 日立建機株式会社 | 作業機械 |
JP2021034111A (ja) | 2019-12-18 | 2021-03-01 | ソニー株式会社 | 磁気記録媒体 |
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- 2022-03-04 WO PCT/JP2022/009301 patent/WO2022186368A1/ja active Application Filing
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JP2008045428A (ja) * | 2006-08-11 | 2008-02-28 | Toyota Motor Corp | 排気ガス浄化システムの故障診断装置 |
JP2008274835A (ja) * | 2007-04-27 | 2008-11-13 | Mitsubishi Fuso Truck & Bus Corp | 酸化触媒の劣化診断装置 |
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