WO2022191138A1 - 制御装置、制御方法および排気浄化システム - Google Patents
制御装置、制御方法および排気浄化システム Download PDFInfo
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- injection amount
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Images
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
- 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
-
- 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
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0408—Methods of control or diagnosing using a feed-back loop
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
-
- 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
- F01N2900/1812—Flow rate
-
- 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
Definitions
- the present invention relates to a control device, a control method, and an exhaust purification system.
- This application claims priority to Japanese Patent Application No. 2021-037402 filed in Japan on March 9, 2021, the contents of which are incorporated herein.
- Patent Document 1 describes the following exhaust purification control system. That is, the exhaust purification control system described in Patent Document 1 supplies a catalyst that is provided in an exhaust passage of an internal combustion engine to purify exhaust gas, and a reactant that is necessary for the reaction of the catalyst upstream of the catalyst. and a controller for controlling the amount of reactant supplied by the reactant supply means.
- the control device includes a step of calculating a basic reactant supply amount from the operating condition of the internal combustion engine, a step of calculating a correction amount so that the correction amount becomes smaller as the increase in the engine speed increases, and a step of calculating the correction amount. and calculating a target reactant supply amount from the reactant supply amount and the correction amount. Further, the control device calculates the correction amount such that the correction amount increases as the accelerator opening increases.
- Patent Document 2 describes the following catalyst efficiency improvement method. That is, the catalyst efficiency improvement method described in Patent Document 1 is a method for improving the efficiency of a NOx reduction catalyst connected downstream of an internal combustion engine, comprising the steps of detecting acceleration that is about to occur in the internal combustion engine; and adjusting the amount of reductant injected to the NOx reduction catalyst to offset fluctuations in the amount of NOx supplied to the internal combustion engine due to acceleration of the internal combustion engine.
- parameters capable of rapidly indicating engine transient conditions such as the rate of change of pedal position, the rate of change of fuel injection amount, the rate of change of engine speed or load, etc., are continuously monitored, and these parameters are is used to continuously adjust the injection amount of the reductant in consideration of the increase or decrease in the amount of NOx entering the catalyst.
- one aspect of the present invention is a control device for controlling an injection amount of reducing agent supplied to a selective reduction catalyst provided in an exhaust passage of an internal combustion engine, the control device comprising: a pre-correction injection amount calculation unit for calculating a pre-correction injection amount of the reducing agent based on a time rate of change of the rotational speed of the internal combustion engine and a time rate of change of the fuel injection amount of the internal combustion engine; and the time rate of change of the fuel injection amount are both positive, the injection amount of the reducing agent increases, and at least both the time rate of change of the rotational speed and the time rate of change of the fuel injection amount are positive. and an injection amount correction unit that calculates a post-correction injection amount obtained by correcting the pre-correction injection amount so that the injection amount of the reducing agent decreases when is negative.
- Another aspect of the present invention is a control method for controlling an injection amount of a reducing agent supplied to a selective reduction catalyst provided in an exhaust passage of an internal combustion engine, the method comprising: calculating a pre-correction injection amount; and based on the time rate of change of the engine speed and the time rate of change of the fuel injection amount of the internal combustion engine, at least the rate of change of the engine speed and the fuel injection amount.
- the injection amount of the reducing agent increases when both the rate of change with time are positive, and the injection amount of the reducing agent increases at least when both the rate of change with time of the rotational speed and the rate of change with time of the fuel injection amount are negative. and calculating a post-correction injection amount obtained by correcting the pre-correction injection amount so that the injection amount decreases.
- one aspect of the present invention includes a selective reduction catalyst provided in an exhaust passage of an internal combustion engine, an injection device for injecting a reducing agent supplied to the selective reduction catalyst, and an injection amount of the reducing agent by the injection device.
- the control device includes a pre-correction injection amount calculation unit that calculates a pre-correction injection amount of the reducing agent based on the operating state of the internal combustion engine, and a time change in the rotational speed of the internal combustion engine. and the time rate of change of the fuel injection amount of the internal combustion engine, the injection amount of the reducing agent is increased at least when both the time rate of change of the rotational speed and the time rate of change of the fuel injection amount are positive.
- the pre-correction injection amount is corrected such that the injection amount of the reducing agent decreases when at least both the time rate of change of the rotational speed and the time rate of change of the fuel injection amount are negative.
- an injection amount correction unit that calculates the amount of injection.
- the injection amount of the reducing agent can be corrected with a simple configuration.
- FIG. 1 is a system diagram showing a configuration example of an exhaust purification 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 block diagram showing a configuration example of a urea water injection amount correction unit 104 shown in FIG. 2.
- FIG. 4 is a schematic diagram for explaining a configuration example of a urea water injection amount correction coefficient calculation unit 105 shown in FIG. 3
- 4 is a block diagram showing a configuration example of a correction amount adjustment unit 107 shown in FIG. 3
- FIG. FIG. 6 is a flow chart showing an operation example of the correction amount adjustment unit 107 shown in FIG. 2 is a flow chart showing an operation example of the exhaust purification system 10 shown in FIG. 1
- FIG. 2 is a schematic diagram showing an operation example of the exhaust purification system 10 shown in FIG. 1;
- FIG. 1 is a system diagram showing a configuration example of an exhaust purification system according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing a configuration example of the control device 100 shown in FIG.
- FIG. 3 is a block diagram showing a configuration example of the urea water injection amount correction unit 104 shown in FIG.
- FIG. 4 is a schematic diagram for explaining a configuration example of the urea water injection amount correction coefficient calculation unit 105 shown in FIG.
- FIG. 5 is a block diagram showing a configuration example of the correction amount adjusting section 107 shown in FIG. FIG.
- FIG. 6 is a flow chart showing an operation example of the correction amount adjustment unit 107 shown in FIG.
- FIG. 7 is a flow chart showing an operation example of the exhaust purification system 10 shown in FIG.
- FIG. 8 is a schematic diagram showing an operation example of the exhaust purification system 10 shown in FIG.
- FIG. 1 shows a configuration example of an exhaust purification system 10 according to an embodiment of the present invention.
- the exhaust gas purification system 10 shown in FIG. It comprises a sensor 92 , an SCR bed temperature sensor 93 and a controller 100 .
- the exhaust purification system 10 according to the present embodiment includes at least the SCR device 6, the urea water injector 7, and the control device 100, for example. 1 mainly shows the configuration related to the injection amount control of the urea water injector 7 in the exhaust purification system 10 or the control device 100 of the present embodiment, and the configuration related to other functions such as the fuel injection control of the engine 1. are omitted as appropriate.
- the engine 1 is one configuration example of an internal combustion engine, and is a multi-cylinder diesel engine in this embodiment.
- the exhaust passage 3 exhausts the exhaust gas from the engine 1 to the atmosphere through the DPF device 5 and the SCR device 6 .
- the DPF device 5 is, for example, a continuously regenerative DPF system, and includes a DOC (Diesel Oxidation Catalyst) 51 and a DPF (Diesel Particulate Filter) 52 inside. Matter (particulate matter) is collected and the nitrogen dioxide converted by DOC51 oxidizes the collected PM downstream to carbon dioxide to remove the PM.
- the DPF device 5 may be a system of other types such as an automatically regenerating DPF system or a manually regenerating DPF system.
- the SCR device 6 has an SCR (Selective Catalytic Reduction; ammonia selective reduction catalyst) 61 inside, and urea water as an example of a reducing agent supplied into the exhaust gas on the upstream side of the SCR 61 by the urea water injector 7 reduces nitrogen It converts oxides (NOx) into nitrogen molecules (N2) and water (H2O).
- the reducing agent may be anhydrous urea or the like.
- the urea water injector 7 is an injection device that injects the urea water supplied to the SCR 61 in the SCR device 6 .
- the amount of urea water injected into the exhaust passage 3 by the urea water injector 7 is controlled by the control device 100 .
- the engine outlet NOx sensor 91 is a sensor that detects the concentration of NOx near the exhaust outlet of the engine 1 in the exhaust passage 3 and outputs a signal indicating the detection result to the control device 100 .
- the SCR outlet NOx sensor 92 is a sensor that detects the concentration of NOx near the exhaust outlet of the SCR device 6 in the exhaust passage 3 and outputs a signal indicating the detection result to the control device 100 .
- the engine outlet NOx sensor 91 and the engine outlet NOx sensor 92 are used, for example, when calculating the NOx reduction effect of the SCR 61 by comparing each measured value.
- the SCR bed temperature sensor 93 measures the catalyst bed temperature of the SCR 61 of the SCR device 6 and outputs the measured result to the control device 100 .
- the SCR bed temperature sensor 93 may be composed of a plurality of temperature sensors, in which case, for example, the average value of a plurality of measured values can be used as the catalyst bed temperature.
- the control device 100 includes an engine outlet NOx sensor 91, an SCR outlet NOx sensor 92, an SCR bed temperature sensor 93, an engine rotation sensor (not shown) for detecting the rotation speed (rotational speed) of the engine 1, and an accelerator pedal (not shown).
- the engine control device 100 shown in FIG. 1 can be configured using, for example, a computer such as a microcomputer, peripheral circuits and peripheral devices of the computer, and hardware such as the computer and programs executed by the computer.
- a plurality of blocks shown in FIG. 2 are provided as a functional configuration configured by combination with software such as.
- FIG. 2 shows a functional configuration related to injection amount control of the urea water injector 7 among a plurality of functional configurations provided in the control device 100 .
- the control device 100 shown in FIG. 2 includes a fuel injection control section 101 and a urea water injection amount control section 102 .
- the urea water injection amount control unit 102 also includes a pre-correction urea water injection amount calculation unit 103 and a urea water injection amount correction unit 104 .
- the fuel injection control unit 101 controls, for example, a fuel injection device (not shown) of the engine 1 to perform fuel injection control.
- the fuel injection control unit 101 outputs information indicating the rotational speed of the engine 1, the fuel injection amount, etc. to the urea water injection amount control unit 102 .
- the urea water injection amount control unit 102 corrects and adjusts the pre-correction urea water injection amount D11 ( FIG. 3 ) calculated by the pre-correction urea water injection amount calculation unit 103 so that the urea water injection amount output by the urea water injection amount correction unit 104 is adjusted.
- the amount of urea water injected by the urea water injector 7 is controlled using the water injection amount final value D16 (FIG. 3) as a target value.
- the pre-correction urea water injection amount calculation unit 103 predicts, for example, the NOx emission amount based on the operating state of the engine 1, and calculates the pre-correction urea water injection amount D11, which is the reference value for the target value of the urea water injection amount.
- the information representing the operating state of the engine 1 is information representing a plurality of parameters used when calculating (estimating) the amount of NOx contained in the exhaust gas of the engine 1. For example, the engine 1 rotation cooling water temperature, intake air temperature, catalyst bed temperature of SCR 61 of SCR device 6, fuel injection amount, fuel injection period, detection result of engine outlet NOx sensor 91, detection result of SCR outlet NOx sensor 92, and the like.
- the information representing the operating state of the engine 1 includes at least detection information from the engine outlet NOx sensor 91 (or the SCR outlet NOx sensor 92) that detects the concentration of NOx in the exhaust passage 3.
- the pre-correction urea water injection amount calculation unit 103 may calculate (estimate) the amount of NOx contained in the exhaust gas of the engine 1 without using the detection results of the engine outlet NOx sensor 91 and the SCR outlet NOx sensor 92. good.
- a urea water injection amount correction unit (injection amount correction unit) 104 is based on the time rate of change (time differential value, also simply referred to as the rate of change) of the rotation speed of the engine 1 and the time rate of change of the fuel injection amount of the engine 1,
- the pre-correction injection amount calculated by the pre-correction urea water injection amount calculation unit 103 is corrected to calculate the post-correction injection amount.
- the urea water injection amount correction unit 104 increases the injection amount of the urea water at least when both the time rate of change of the rotational speed and the time rate of change of the fuel injection amount are positive.
- the injection amount before correction is corrected to calculate the injection amount after correction so that the injection amount of urea water decreases when both the rate and the rate of change over time of the fuel injection amount are negative.
- the urea water injection amount correction unit 104 may further adjust the post-correction injection amount so that the integrated value of the difference between the pre-correction injection amount and the post-correction injection amount becomes zero.
- the corrected injection amount may be adjusted to a predetermined lower limit value or more.
- FIG. 3 shows a configuration example of the urea water injection amount correction unit 104 shown in FIG.
- the urea water injection amount correction unit 104 shown in FIG. 3 includes a urea water injection amount correction coefficient calculator 105, a multiplier 106, and a correction amount adjustment unit 107.
- the pre-correction urea water injection amount D11 is corrected to calculate the post-correction urea water injection amount D15, and the post-correction urea water injection amount D15 is adjusted. is output as the urea water injection amount final value D16.
- the urea water injection amount correction unit 104 determines whether the urea water injection amount final value D16 is the pre-correction urea water injection amount D11, the post-correction urea water injection amount D15, or a predetermined lower limit (0.3 ml in the following example). /s), the corrected urea water injection amount D15 is adjusted to calculate a final urea water injection amount value D16.
- the urea water injection amount correction coefficient calculation unit 105 uses, for example, a table (or map) 1051 shown in FIG. 4 to calculate the urea water injection amount correction coefficient D14. Further, the multiplier 106 multiplies the pre-correction urea water injection amount D11 by the urea water injection correction amount coefficient D14 to calculate the post-correction urea water injection amount D15.
- a table 1051 shown in FIG. 4 uses the fuel injection amount change rate [mg/stroke/s] and the engine speed change rate [rpm/s] as parameters, and each combination of the fuel injection amount change rate and the engine speed change rate each value of the urea water injection correction amount coefficient D14 corresponding to .
- the fuel injection amount change rate when it is a positive value, it means an increase in the fuel injection amount change rate, and when it is a negative value, it means a decrease in the fuel injection amount change rate.
- a positive value of the engine speed change rate means an increase in the engine speed, and a negative value means a decrease in the engine speed.
- the urea water injection amount correction coefficient calculation unit 105 calculates, for example, when the fuel injection amount change rate is 200 [mg/stroke/s] and the engine speed change rate is 200 [rpm/s]. , the urea water injection correction amount coefficient D14 is calculated as "2.0". Further, for example, when the fuel injection amount change rate is -200 [mg/stroke/s] and the engine speed change rate is -200 [rpm/s], the urea water injection amount correction coefficient calculation unit 105 The correction amount coefficient D14 is calculated as "0.5". When the urea water injection correction amount coefficient D14 is "1", the urea water injection amount before correction D11 and the urea water injection amount after correction D15 are the same. When the urea water injection amount D15 increases (correction in the increasing direction) and is smaller than "1", the urea water injection amount after correction D15 becomes smaller than the urea water injection amount before correction D11 (correction in the decreasing direction).
- the table 1051 corresponds to the following trends. That is, when the fuel injection amount increases, it indicates that the load is increasing, and an increase in NOx flowing into the SCR 61 can be predicted. Conversely, when the fuel injection amount is decreasing, a decrease in NOx can be predicted. Also, when there is no change in the fuel injection amount, no correction is performed. If the rotation speed increases, the absolute amount of NOx increases. It can be inferred that the absolute amount of NOx will decrease if the number of revolutions decreases.
- the correspondence relationship between the combination of the fuel injection amount change rate and the engine speed change rate and the urea water injection correction amount coefficient D14 is set based on the results of experiments with an actual machine or the results of simulations using models. be able to.
- the post-correction urea water injection amount D15 increases when the time rate of change of the fuel injection amount is positive, and the fuel injection amount D15 increases.
- the urea water correction coefficient D14 is calculated such that the post-correction urea water injection amount D15 decreases when the time rate of change of the injection amount is negative.
- the table 1051 is an example, and for example, the range of each rate of change may be subdivided.
- the multiplier 106 may be calculated after interpolating the value of the urea water correction coefficient D14 based on each rate of change.
- the correction amount adjustment unit 107 shown in FIG. 3 includes, for example, a temperature correction value calculation unit 1071, an adder 1072, a total correction amount calculation unit 1073, and a urea water injection amount final value determination unit 1074, as shown in FIG.
- the correction amount adjustment unit 107 shown in FIG. 5 receives the corrected urea water injection amount D15, the pre-correction urea water injection amount D11, the SCR bed temperature D17, and the urea water injection amount correction coefficient D14.
- Quantity final value D16 is calculated and output. 5 differs from the correction amount adjustment unit 107 shown in FIG. 3 in that the SCR bed temperature D17 is newly input.
- the temperature correction value calculator 1071 calculates a correction value (SCR bed temperature correction value D18) for calculating the integrated value of the ammonia adsorption amount of the SCR 61 based on the SCR bed temperature D17 and the saturated adsorption amount curve of the SCR 61. to calculate
- the saturated adsorption amount curve is a curve representing the maximum value of the ammonia adsorption amount of the SCR 61 at each temperature (for example, Japanese Patent Application Laid-Open No. 2010-261388), and the SCR bed temperature correction value D18 is used to calculate the integrated value of the ammonia adsorption amount. It is a correction value for calculating the integrated value so as not to exceed the saturated adsorption amount at the time, and takes a value such as zero, a positive value, or a negative value with a certain temperature as a reference.
- Adder 1072 calculates (final urea water injection amount D16) ⁇ (pre-correction urea water injection amount D11)+(SCR bed temperature correction value D18) and outputs the calculated result to total correction amount calculation section 1073. .
- the total correction amount calculation unit 1073 calculates the total correction amount S by integrating ⁇ (final urea water injection amount D16)-(pre-correction urea water injection amount D11)+(SCR bed temperature correction value D18) ⁇ .
- the total correction amount S is a value obtained by adding a correction based on the SCR bed temperature correction value D18 to the difference from the pre-correction aqueous urea injection amount D11 in the final value D16 of the aqueous urea injection amount. It is a value corresponding to the amount of ammonia estimated to have accumulated in the SCR 61 based on the difference from the reference injection amount after correction. Note that the total correction amount calculation unit 1073 limits the value of the total correction amount S so that the total correction amount S becomes a value larger than zero.
- the total correction amount calculation unit 1073 integrates the amount increased from the base urea water injection amount by correction as a positive value.
- the post-correction urea water injection amount D15 ⁇ the pre-correction urea injection amount D11 takes a positive or negative value.
- the total correction amount S is also decreased because the base urea water injection amount is decreased.
- the total correction amount calculation unit 1073 may use the SCR bed temperature correction value D18 as the upper limit value of the total correction amount S.
- the temperature correction value calculation unit 1071 adjusts the upper limit value for calculating the integrated value of the ammonia adsorption amount of the SCR 61 based on the SCR bed temperature D17, based on the saturated adsorption amount curve of the SCR 61.
- a value (upper limit) is calculated and output as D18.
- the SCR bed temperature correction value D18 output from the temperature correction value calculator 1071 is not input to the adder 1072 but is input to the total correction amount calculator 1073 .
- Adder 1072 also calculates (final urea water injection amount value D16) ⁇ (pre-correction urea water injection amount D11) and outputs the calculated result to total correction amount calculation section 1073 . Then, the total correction amount calculation unit 1073 integrates ⁇ (final urea water injection amount D16) ⁇ (pre-correction urea water injection amount D11) ⁇ with the SCR bed temperature correction value D18 as the upper limit value, and the total correction amount S (where S>0) is calculated.
- the urea water injection amount final value determination unit 1074 inputs the corrected urea water injection amount D15, the pre-correction urea water injection amount D11, the total correction amount S, and the urea water injection amount correction coefficient D14, which is used as a reference. In order to prevent the total injection amount from changing due to the correction of the urea water injection amount (pre-correction urea water injection amount D11) and to prevent the injection amount from falling below a predetermined lower limit due to the correction in the decreasing direction, the correction is performed.
- the post-correction urea water injection amount D15 By adjusting the post-correction urea water injection amount D15 (instead of using the post-correction urea water injection amount D15 as it is as the urea water injection amount final value D16), the post-correction urea water injection amount D15 can be adjusted according to conditions. By using different values), the urea water injection amount final value D16 is calculated and output.
- the urea water injection amount final value determination unit 1074 determines the pre-correction urea water injection amount D11 (pre-correction injection amount) and the post-correction urea water injection amount D15.
- the final value D16 of the urea water injection amount can be calculated by adjusting the corrected urea water injection amount D15 so that the integrated value of the difference from the (corrected injection amount) becomes zero.
- the urea water injection amount correction unit 104 adjusts the corrected urea water injection amount D15 so as to be equal to or greater than a predetermined lower limit value, and adjusts the urea water injection amount final value D16. can be calculated.
- the urea water injection amount final value determination unit 1074 calculates the urea water injection amount final value D16 by classifying, for example, the following cases (1) to (3).
- urea water injection amount correction coefficient D14 correction coefficient
- FIG. 6 shows an operation example of the urea water injection amount final value determination unit 1074 .
- the urea water injection amount final value determining unit 1074 first temporarily sets the urea water injection amount final value D16 to the post-correction urea water injection amount D15 (step S101).
- the urea water injection amount final value determining unit 1074 determines whether or not the urea water injection amount correction coefficient D14 is 1 or less (step S102). If the urea water injection amount correction coefficient D14 is greater than 1 (“N” in step S102), the urea water injection amount final value determining unit 1074 terminates the processing shown in FIG. In this case, the urea water injection amount final value D16 becomes the corrected urea water injection amount D15.
- the urea water injection amount final value determination unit 1074 determines that the pre-correction urea water injection amount D11 is the lower limit value (0.3 ml /s) is exceeded (step S103). If the pre-correction urea water injection amount D11 does not exceed the lower limit value (0.3 ml/s) (“N” in step S103), the urea water injection amount final value determination unit 1074 determines the final value of the urea water injection amount. D16 is set as the pre-correction urea water injection amount D11 (step S106), and the process shown in FIG. 6 is terminated. In this case, the urea water injection amount final value D16 becomes the pre-correction urea water injection amount D11.
- the urea water injection amount final value determination unit 1074 sets the urea water injection amount final value D16 as the pre-correction urea water injection amount D11 (step S106), the process shown in FIG. 6 is terminated. In this case, the urea water injection amount final value D16 becomes the pre-correction urea water injection amount D11.
- the control device 100 of the present embodiment controls the injection amount of urea water (reducing agent) supplied to the SCR 61 (selective reduction catalyst) provided in the exhaust passage 3 of the engine 1 (internal combustion engine).
- a device comprising: a pre-correction injection amount calculation unit 103 for calculating a pre-correction injection amount D11 (pre-correction injection amount) of urea water based on the operating state of the engine 1; Based on the engine speed change rate D12) and the time change rate of the fuel injection amount of the engine 1 (fuel injection amount change rate D13), at least both the engine speed change rate D12 and the fuel injection amount change rate D13 are positive.
- the injection amount of urea water before correction increases so that the injection amount of urea water increases at least when both the engine speed change rate D12 and the fuel injection amount change rate D13 are negative.
- a urea water injection amount correction unit 104 injection amount correction unit that calculates a post-correction urea water injection amount D15 by correcting D11. According to the present embodiment, with a simple configuration, the injection amount of urea water can be corrected even when the amount of increase in fuel injection amount is large and the amount of increase in engine speed is also large.
- the urea water injection amount correction unit 104 (injection amount correction unit) further adjusts the post-correction urea water injection amount so that the integrated value of the difference between the pre-correction urea water injection amount D11 and the post-correction urea water injection amount D15 becomes zero.
- the injection amount D15 can be adjusted. According to this configuration, the injection amount of urea water before correction and after correction can be the same. Further, according to the present embodiment, even if the pre-correction urea water injection amount D11 is optimized for the system for the total injection amount for a predetermined time, the injection amount after correction can be used to maintain the optimization. can be done.
- the urea water injection amount correction unit 104 can adjust the post-correction urea water injection amount D15 so as to be equal to or greater than a predetermined lower limit value. can.
- the control device 100 (for example, the urea water injection amount control section 102) acquires the engine speed and the fuel injection amount (for example, from the combustion injection amount control section 101) (step S201).
- the control device 100 (for example, the urea water injection amount control unit 102) calculates the change rate of the engine speed and the change rate of the fuel injection amount (step S202).
- the rotation speed of the engine 1 and the fuel injection amount change (S203).
- the pre-correction urea water injection amount calculator 103 predicts the NOx emission amount and calculates the pre-correction urea water injection amount D11 (step S204).
- step S204 when the change rate of the fuel injection amount is a negative value (NOx decreases), the urea water injection amount correction unit 104 corrects the injection amount (step S205), thereby decreasing the urea water injection amount. (Step S206). Then, since the engine outlet NOx sensor 91 detects a decrease in NOx (step S207), the pre-correction urea water injection amount D11 decreases (step S208).
- step S204 if the change rate of the fuel injection amount is a positive value (NOx increases) in step S204, the urea water injection amount correction unit 104 corrects the injection amount (step S209), and increases the urea water injection amount. becomes (step S210). Then, since the engine outlet NOx sensor 91 detects an increase in NOx (step S211), the pre-correction urea water injection amount D11 increases (step S212).
- FIG. 8 shows an example of control of the urea water injection amount according to this embodiment. From top to bottom, changes over time in the rate of change of the fuel injection amount and the rate of change in the engine speed, changes over time in the measurement results of the engine outlet NOx sensor 91 and the urea water injection amount (before correction), and the engine outlet NOx sensor. 91 shows the time change of the measurement result of 91 and the urea water injection amount (after correction). The urea water injection amount (after correction) increases by an area A1 hatched in correspondence with the increase C1 in the change rate of the fuel injection amount.
- the urea water injection amount (after correction) increases by the area A3.
- the NOx sensor installed at the engine outlet detects It is possible to change the urea injection amount before detecting the change in NOx.
- the delay time until the NOx sensor detects a change in the NOx amount in the exhaust gas can be covered, so the degree of freedom for the installation location of the NOx sensor can be increased.
- the control device increases the urea injection amount by detecting a change in NOx in the exhaust gas by the NOx sensor. At this time, by subtracting the urea water injection amount increased in (1) above, the urea amount per unit of exhaust gas can be reduced, and the risk of urea deposits accumulating inside the exhaust pipe is reduced. be able to.
- the correction amount adjustment unit 107 is omitted and the corrected urea water injection amount D15 is set to the urea water injection amount final value D16, or in FIG.
- the value correction amount calculation unit 1073 may be omitted, and the classification based on the total correction amount S in the urea water injection amount final value determination unit 1074 may be omitted.
- part or all of the programs executed by the computer in the above embodiments can be distributed via computer-readable recording media or communication lines.
- the injection amount of the reducing agent can be corrected with a simple configuration.
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Abstract
Description
本願は、2021年3月9日に日本に出願された特願2021-037402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、本発明の実施形態に係る排気浄化システム10の構成例を示す。図1に示す排気浄化システム10は、エンジン1と、排気通路3と、DPF装置5と、SCR装置6と、尿素水インジェクタ7と、エンジン出口NOx(窒素酸化物)センサ91と、SCR出口NOxセンサ92と、SCRベッド温度センサ93と、制御装置100とを備える。なお、本実施形態に係る排気浄化システム10は、例えば、SCR装置6と、尿素水インジェクタ7と、制御装置100とを少なくとも備えるものである。なお、図1では、本実施形態の排気浄化システム10あるいは制御装置100において、尿素水インジェクタ7の噴射量制御に係る構成を主に示し、エンジン1の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1に示すエンジン制御装置100は、例えばマイクロコンピュータ等のコンピュータと、そのコンピュータの周辺回路や周辺装置とを用いて構成することができ、そのコンピュータ等のハードウェアと、そのコンピュータが実行するプログラム等のソフトウェアとの組み合わせから構成される機能的構成として、図2に示す複数のブロックを備える。なお、図2は、制御装置100が備える複数の機能的構成のうち、尿素水インジェクタ7の噴射量制御に係る機能的構成を示している。図2に示す制御装置100は、燃料噴射制御部101と、尿素水噴射量制御部102とを備える。また、尿素水噴射量制御部102は、補正前尿素水噴射量算出部103と、尿素水噴射量補正部104とを含む。
次に、図7を参照して、排気浄化システム10の動作例について説明する。図7に示す動作は、所定の周期で繰り返し行われる。図7に示す動作では、まず、制御装置100(例えば尿素水噴射量制御部102)が、(例えば燃焼噴射量制御部101から)エンジン回転数、燃料噴射量を取得する(ステップS201)。次に、制御装置100(例えば尿素水噴射量制御部102)が、エンジン回転数の変化率と、燃料噴射量の変化率を演算する(ステップS202)。ここで、エンジン1の回転数と燃料噴射量が変化する(S203)。
Claims (6)
- 内燃機関の排気通路に設けられた選択還元触媒に供給する還元剤の噴射量を制御する制御装置であって、
前記内燃機関の運転状態に基づき前記還元剤の補正前噴射量を算出する補正前噴射量算出部と、
前記内燃機関の回転数の時間変化率と前記内燃機関の燃料噴射量の時間変化率とに基づき、少なくとも前記回転数の時間変化率と前記燃料噴射量の時間変化率の両者が正である場合に前記還元剤の噴射量が増加し、少なくとも前記回転数の時間変化率と前記燃料噴射量の時間変化率の両者が負である場合に前記還元剤の噴射量が減少するように、前記補正前噴射量を補正した補正後噴射量を算出する噴射量補正部と
を備える制御装置。 - 前記噴射量補正部は、さらに、前記補正前噴射量と前記補正後噴射量との差分の積算値が零となるように前記補正後噴射量を調整する
請求項1に記載の制御装置。 - 前記噴射量補正部は、さらに、前記還元剤の噴射量を減少させる場合、所定の下限値以上となるように前記補正後噴射量を調整する
請求項1または2に記載の制御装置。 - 前記運転状態を表す情報は、前記排気通路における窒素酸化物の濃度を検知するセンサの検知情報を少なくとも含む
請求項1から3のいずれか1項に記載の制御装置。 - 内燃機関の排気通路に設けられた選択還元触媒に供給する還元剤の噴射量を制御する制御方法であって、
前記内燃機関の運転状態に基づき前記還元剤の補正前噴射量を算出するステップと、
前記内燃機関の回転数の時間変化率と前記内燃機関の燃料噴射量の時間変化率とに基づき、少なくとも前記回転数の時間変化率と前記燃料噴射量の時間変化率の両者が正である場合に前記還元剤の噴射量が増加し、少なくとも前記回転数の時間変化率と前記燃料噴射量の時間変化率の両者が負である場合に前記還元剤の噴射量が減少するように、前記補正前噴射量を補正した補正後噴射量を算出するステップと
を含む制御方法。 - 内燃機関の排気通路に設けられた選択還元触媒と、
前記選択還元触媒に供給される還元剤を噴射する噴射装置と、
前記噴射装置による前記還元剤の噴射量を制御する制御装置と
を備え、
前記制御装置は、前記内燃機関の運転状態に基づき前記還元剤の補正前噴射量を算出する補正前噴射量算出部と、前記内燃機関の回転数の時間変化率と前記内燃機関の燃料噴射量の時間変化率とに基づき、少なくとも前記回転数の時間変化率と前記燃料噴射量の時間変化率の両者が正である場合に前記還元剤の噴射量が増加し、少なくとも前記回転数の時間変化率と前記燃料噴射量の時間変化率の両者が負である場合に前記還元剤の噴射量が減少するように、前記補正前噴射量を補正した補正後噴射量を算出する噴射量補正部とを備える
排気浄化システム。
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