WO2022181641A1 - 炭化水素堆積量推定装置、炭化水素堆積量推定方法、制御装置および排気ガス浄化システム - Google Patents
炭化水素堆積量推定装置、炭化水素堆積量推定方法、制御装置および排気ガス浄化システム Download PDFInfo
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- 238000007254 oxidation reaction Methods 0.000 claims abstract description 9
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Images
Classifications
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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
- F02D41/1459—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 hydrocarbon content or concentration
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- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
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- 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
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
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- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- 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
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- F02D2200/02—Input parameters for engine control the parameters being related to the engine
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- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
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- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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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
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- 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 hydrocarbon deposition amount estimation device, a hydrocarbon deposition amount estimation method, a control device, and an exhaust gas purification system.
- HC unburned hydrocarbons
- HC is a general term for organic compounds containing carbon and hydrogen
- a system is described for accelerating heating of an exhaust line of an exhaust gas aftertreatment system when the estimated result exceeds a predetermined threshold.
- the HC increase amount (P) is calculated using a map created based on experimental data using the internal combustion engine speed (RPM), the injected fuel mass, the intake air mass, and preferably the ambient temperature as parameters. calculated as Also, the amount of HC reduction (C) is estimated depending on the temperature of the devices that make up the exhaust gas aftertreatment system.
- the increase in HC (P) is calculated using a map whose parameters are the speed of the internal combustion engine, the mass of the injected fuel, the mass of the intake air and preferably the ambient temperature. .
- the ambient temperature for example, when the ambient temperature is low, the estimation error of the HC increase amount differs depending on whether the internal combustion engine is relatively warm or not. The problem is to put it away.
- the estimation accuracy can be expected to improve. .
- the present invention has been made in view of the above circumstances, and provides a hydrocarbon deposition amount estimation device, a hydrocarbon deposition amount estimation method, a control device, and an exhaust gas that are capable of estimating a hydrocarbon (HC) deposition amount with appropriate accuracy. It is an object of the present invention to provide a gas purification system.
- one aspect of the present invention provides at least a first measured value corresponding to an intake air temperature of an internal combustion engine, a second measured value corresponding to a temperature of a cooling liquid of the internal combustion engine, and a and a third measured value corresponding to the exhaust gas flow rate of the hydrocarbon accumulation amount estimating unit for estimating the accumulation amount of hydrocarbons accumulated in the exhaust gas purification device of the internal combustion engine provided with the oxidation catalyst. It is a quantity estimator.
- At least a first measured value corresponding to the intake air temperature of the internal combustion engine, a second measured value corresponding to the temperature of the cooling liquid of the internal combustion engine, and the exhaust gas flow rate of the internal combustion engine and a corresponding third measured value are at least a first measured value corresponding to the intake air temperature of the internal combustion engine, a second measured value corresponding to the temperature of the cooling liquid of the internal combustion engine, and the exhaust gas flow rate of the internal combustion engine and a corresponding third measured value.
- At least a first measured value corresponding to the intake air temperature of the internal combustion engine, a second measured value corresponding to the temperature of the cooling liquid of the internal combustion engine, and the exhaust gas flow rate of the internal combustion engine a hydrocarbon deposit amount estimating unit for estimating the amount of hydrocarbon deposits deposited in an exhaust gas purifying device of the internal combustion engine provided with an oxidation catalyst based on the corresponding third measured value;
- the control device includes a temperature increase control execution unit that executes temperature control.
- At least a first measured value corresponding to the intake air temperature of the internal combustion engine, a second measured value corresponding to the temperature of the cooling liquid of the internal combustion engine, and the exhaust gas flow rate of the internal combustion engine a hydrocarbon deposit amount estimating unit for estimating the amount of hydrocarbon deposits deposited in an exhaust gas purifying device of the internal combustion engine provided with an oxidation catalyst based on the corresponding third measured value;
- the exhaust gas purification system includes a control device including a temperature increase control execution unit that executes temperature control, and the exhaust gas purification device.
- the hydrocarbon (HC) deposition amount can be estimated appropriately and accurately.
- 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 an engine control device 100 shown in FIG. 1
- FIG. FIG. 3 is a schematic diagram showing a configuration example of an environmental condition determination map 211 shown in FIG. 2
- FIG. FIG. 3 is a schematic diagram showing a configuration example of a normal control HC increase amount estimation map 212 shown in FIG. 2
- FIG. 3 is a schematic diagram showing a configuration example of an HC increase amount estimation map 213 during low temperature control shown in FIG. 2
- 3 is a schematic diagram showing a configuration example of an HC reduction amount estimation map 214 shown in FIG. 2.
- FIG. 3 is a flowchart showing an operation example of the engine control device 100 shown in FIG. 2;
- FIG. FIG. 3 is a flowchart showing an operation example of the engine control device 100 shown in FIG. 2;
- FIG. 2 is a timing chart schematically showing an operation example of the engine control system 10 shown in FIG. 1;
- 2 is a block diagram showing a configuration example of an engine control device 100 (engine control device 100a) shown in FIG. 1;
- FIG. 11 is a block diagram showing a configuration example of a map included in a fuel injection control map 301 shown in FIG. 10;
- FIG. 12 is a schematic diagram showing a configuration example of an injection timing control map 311 shown in FIG. 11;
- FIG. 12 is a schematic diagram showing a configuration example of a rail pressure control map 312 shown in FIG. 11;
- FIG. 12 is a schematic diagram showing a configuration example of a pilot injection amount control map 313 shown in FIG. 11;
- FIG. FIG. 12 is a schematic diagram showing a configuration example of a pilot injection period control map 314 shown in FIG. 11;
- FIG. FIG. 12 is a schematic diagram showing a configuration example of a post-injection amount control map 315 shown in FIG. 11;
- FIG. FIG. 11 is a flow chart showing an operation example of the engine control device 100a shown in FIG. 10;
- FIG. 2 is a block diagram showing a configuration example of an engine control device 100 (engine control device 100b) shown in FIG. 1;
- FIG. 19 is a schematic diagram showing a configuration example of an HC increase estimation map 215 shown in FIG. 18;
- FIG. 19 is a schematic diagram showing a configuration example of a correction gain map 216 shown in FIG. 18;
- FIG. 19 is a flow chart showing an operation example of the engine control device 100b shown in FIG. 18;
- FIG. FIG. 2 is an explanatory diagram for explaining an operation example of the engine control system 10 shown in FIG. 1;
- 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.
- the engine control system 10 shown in FIG. 1 includes an engine 1, a turbocharger 2, an exhaust passage 3, an exhaust gas purification device 4, a monitor 8, an engine control device 100, an engine water temperature sensor 91, an intake manifold temperature A sensor 92 and an engine rotation sensor 93 are provided.
- FIG. 1 mainly shows the configuration related to the function of estimating the deposition amount of HC (hydrocarbon) in the exhaust gas purification device 4 in the engine control system 10 or the engine control device 100 of the present embodiment, and fuel injection control.
- the illustration of the configuration related to other functions such as is 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 turbocharger 2 is a supercharger that compresses the intake air of the engine 1 using the exhaust gas of the engine 1 .
- the exhaust passage 3 exhausts the exhaust of the engine 1 to the atmosphere through the exhaust gas purification device 4 .
- the exhaust gas purification device 4 is a device for purifying nitrogen oxides (NOx) and particulate matter (PM (Particulate Matter)) contained in the exhaust gas of the engine 1, and is provided in the exhaust passage 3 of the engine 1.
- a DPF device 5 an SCR device 6 , a temperature raising device 7 , a temperature sensor 94 and a temperature sensor 95 are provided.
- the DPF device 5 includes a DOC (Diesel Oxidation Catalyst) 51 and a DPF (Diesel Particulate Filter) 52.
- the DPF 52 collects PM, and the DOC 51 converts the nitrogen dioxide into PM collected downstream is oxidized to carbon dioxide to remove PM.
- the SCR device 6 comprises an SCR (Selective Catalytic Reduction; ammonia selective reduction catalyst) 61, a pump 62 and a tank 63 for supplying urea water to the exhaust gas on the upstream side of the SCR 61, and converts nitrogen oxides (NOx) into nitrogen molecules. (N2) and water (H2O).
- SCR Selective Catalytic Reduction; ammonia selective reduction catalyst
- diesel engine exhaust also contains HC (hydrocarbons).
- This HC deposits on the DOC 51 , DPF 52 and SCR 61 in the region. If this state continues for a long time, the accumulated amount of HC continues to increase. Therefore, when the engine 1 is operated under a high load next time, the temperature inside the exhaust gas purification device 4 rises and the accumulated HC burns rapidly. , the exhaust gas purification device 4 may be damaged. For this reason, when the operating condition of the engine continues for a long time with a low load (approximately 200 degrees or less upstream of the exhaust gas purification device 4), it is determined that a certain amount of HC (to the extent that there is no risk of damage) has accumulated. In such a case, it is necessary to periodically raise the exhaust temperature to release the accumulated HC.
- HC hydrocarbons
- the temperature raising device 7 includes, for example, a fuel injection device, a burner, a heater, an exhaust valve that throttles the exhaust passage 3, etc., and raises the exhaust temperature on the upstream side of the DOC 51.
- the temperature raising device 7 removes the accumulation of PM in the DPF 52 caused by the operating range of the engine 1 and the accumulation of urea deposits, which are solid substances derived from urea water, in the exhaust passage 3. In order to release the accumulated HC, it is controlled by the engine control device 100 to raise the temperature of the exhaust gas in the exhaust gas purification device 4 to the target temperature.
- the temperature sensor 94 measures the inlet temperature of the DOC 51 and outputs the measured result to the engine control device 100 .
- the temperature sensor 95 measures the outlet temperature of the DOC 51 and outputs the measured result to the engine control device 100 .
- the measured value of the temperature sensor 94 and the measured value of the temperature sensor 95 are examples of the fourth measured value corresponding to the temperature inside the exhaust gas purification device 4 .
- One of the temperature sensor 94 and the temperature sensor 95 may be omitted.
- the fourth measured value is not limited to the inlet temperature or outlet temperature of the DOC 51, and may be the temperature of other locations.
- the monitor 8 has, for example, a display panel and an input panel, and functions as a display device and an input device. to the engine control device 100.
- the engine water temperature sensor 91 measures the temperature of engine cooling water, which is the cooling liquid of the engine 1 (hereinafter referred to as engine water temperature), and outputs the measured result to the engine control device 100 .
- the measured value of the engine water temperature sensor 91 is an example of the second measured value corresponding to the temperature of the coolant of the engine 1 .
- the intake manifold temperature sensor 92 measures the temperature of gas flowing through an intake manifold (not shown) of the engine 1 (hereinafter referred to as intake manifold temperature) and outputs the measured result to the engine control device 100 .
- the measured value of the intake manifold temperature sensor 92 is an example of the first measured value corresponding to the intake air temperature of the engine 1 .
- the engine rotation sensor 93 measures the number of revolutions (rotational speed) of the crankshaft provided in the engine 1 (hereinafter referred to as engine number of revolutions) and outputs the measurement result to the engine control device 100 .
- the measured value of this engine rotation sensor 93 is an example of the third measured value corresponding to the exhaust gas flow rate of the engine 1 .
- the third measured value may be a value obtained by measuring the exhaust gas flow rate itself.
- the engine control device 100 repeatedly inputs analog or digital sensor signals output from a plurality of sensors including an engine coolant temperature sensor 91, an intake manifold temperature sensor 92, and an engine rotation sensor 93 at a predetermined cycle.
- fuel injection control using an injector, various motors and valves, automatic control by the temperature raising device 7 such as HC release control accumulated in the exhaust gas purification device 4 (hereinafter, this control is referred to as (referred to as automatic regeneration), or control such as HC release control after fixing the engine speed at a certain speed based on a manual instruction (hereinafter, this control is referred to as stationary manual regeneration).
- Stationary manual regeneration is used when the exhaust gas temperature does not rise sufficiently under normal operating conditions (a condition in which normal work can be performed without fixing the engine speed to a certain speed), and PM and urea deposits cannot be removed and HC cannot be released.
- This control is for stopping normal operation and recovering the performance of the exhaust gas purifying device 4 with the permission of the user.
- the engine control device 100 first uses the monitor 8 to indicate to the user that the stationary manual regeneration can be performed and to request the user to perform the stationary manual regeneration.
- the engine control device 100 fixes the engine speed at a certain speed, raises the exhaust temperature, and removes PM or urea. Deposit removal and HC release are performed.
- the engine control device 100 defines different control states according to at least two temperatures, low temperature control and normal control. For example, fuel injection control suitable for temperatures higher than low temperatures is performed.
- FIG. 2 is a block diagram showing a configuration example of the engine control device 100 shown in FIG.
- FIG. 3 is a schematic diagram showing a configuration example of the environmental condition determination map 211 shown in FIG.
- FIG. 4 is a schematic diagram showing a configuration example of the normal control HC increase amount estimation map 212 shown in FIG.
- FIG. 5 is a schematic diagram showing a configuration example of the HC increase amount estimation map 213 during low temperature control shown in FIG.
- FIG. 6 is a schematic diagram showing a configuration example of the HC reduction amount estimation map 214 shown in FIG.
- the engine control device 100 shown in FIG. 2 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 for estimating the amount of accumulated HC in the exhaust gas purifying device 4 among the plurality of functional configurations provided in the engine control device 100, and an HC function based on the estimated result of the accumulated amount of HC.
- 1 shows a functional configuration related to the release control of
- the engine control device 100 shown in FIG. It includes a fixed number control execution unit 106 , an HC release control stop determination unit 107 , and a storage unit 108 .
- the storage unit 108 also stores an HC deposition amount estimation map 201 .
- the accumulated HC amount estimation map 201 includes an environmental condition determination map 211 , a normal control HC increase amount estimation map 212 , a low temperature control HC increase amount estimation map 213 , and an HC decrease amount estimation map 214 .
- HC deposition amount estimation map 201 and other maps described later can be created based on, for example, test results and simulation results using actual machines.
- the environmental condition determination unit 101 determines environmental conditions using the environmental condition determination map 211 based on the intake manifold temperature and the engine water temperature.
- the environmental conditions are factors surrounding the engine 1 that affect the amount of HC emitted by the engine 1 (or the exhaust temperature of the engine 1).
- the environmental conditions are defined by two states, ie, whether the fuel injection control of the engine 1 is low temperature control or normal control.
- FIG. 3 shows a configuration example of the environmental condition determination map 211. As shown in FIG.
- the environmental condition determination map 211 shown in FIG. 3 is a map that defines environmental conditions (low temperature control or normal control) using the intake manifold temperature and the engine coolant temperature as parameters.
- the HC deposition amount estimation unit 102 calculates the estimated HC deposition amount in the exhaust gas purification device 4 repeatedly at a predetermined calculation cycle using the following formula.
- Estimated HC deposition amount [g] Estimated HC deposition amount calculated in the previous calculation process [g] + HC increase [g] + HC decrease [g]
- the estimated HC deposition amount [g] and the HC increase amount [g] have 0 or positive values
- the HC decrease amount [g] has 0 or negative values.
- the accumulated HC amount estimation unit 102 generates the HC increase amount estimation map 212 during normal control or the HC increase amount estimation map 213 during low temperature control based on the environmental conditions determined by the environmental condition determination unit 101, the engine speed, and the DOC temperature.
- HC decrease amount is estimated using the HC decrease amount estimation map 214 based on the engine speed and the DOC temperature.
- the HC deposition amount estimating unit 102 adds the HC deposition amount estimated value calculated in the calculation process of the previous calculation cycle to the HC increase amount and HC decrease amount calculated this time to obtain the HC deposition amount estimated value.
- the DOC temperature is, for example, the inlet temperature of the DOC 51 measured by the temperature sensor 94, the outlet temperature of the DOC 51 measured by the temperature sensor 95, or a calculated value (average value, etc.) from the inlet and outlet temperatures of the DOC 51. .
- FIG. 4 shows a configuration example of the normal control HC increase amount estimation map 212 (first correspondence information).
- the normal control HC increase amount estimation map 212 defines the HC increase amount [mg/s] per unit time when the environmental conditions are normal control using the engine speed and the DOC temperature as parameters.
- the HC deposition amount estimation unit 102 uses the normal control HC increase amount estimation map 212 to estimate the HC increase amount per unit time corresponding to the engine speed and the DOC temperature. By acquiring [mg/s] and multiplying the HC increase amount per unit time by the calculation period [s], the HC increase amount [g] can be obtained.
- FIG. 5 shows a configuration example of the low temperature control HC increase amount estimation map 213 (first correspondence information).
- the low temperature control HC increase amount estimation map 213 defines the HC increase amount [mg/s] per unit time when the environmental condition is low temperature control, using the engine speed and the DOC temperature as parameters.
- the HC deposition amount estimation unit 102 uses the low temperature control HC increase amount estimation map 213 to estimate the HC increase amount per unit time corresponding to the engine speed and the DOC temperature. By acquiring [mg/s] and multiplying the HC increase amount per unit time by the calculation period [s], the HC increase amount [g] can be obtained.
- FIG. 6 shows a configuration example of the HC reduction amount estimation map 214 (second correspondence information).
- the HC reduction amount estimation map 214 defines the HC reduction amount [mg/s] per unit time using the engine speed and the DOC temperature as parameters.
- the HC deposition amount estimation unit 102 acquires the HC reduction amount [mg/s] per unit time corresponding to the engine speed and the DOC temperature using the HC reduction amount estimation map 214, and calculates the HC reduction amount per unit time. is multiplied by the calculation period [s], the HC reduction amount [g] can be obtained.
- the HC release control start determination unit 103 compares the HC deposition amount estimated value estimated by the HC deposition amount estimation unit 102 with a predetermined determination value, and if the HC deposition amount estimated value is equal to or greater than the determination value, HC release control is started. is determined to start. In HC release control, automatic regeneration and stationary manual regeneration are staged.
- the determination value is set, for example, to a value that allows the exhaust gas purification device 4 to avoid damage due to HC deposition with a margin.
- the temperature increase control execution unit 104 controls the temperature increase device 7 to perform automatic regeneration.
- the notification instruction unit 105 uses the monitor 8 to issue a notification that the stationary manual regeneration can be performed, to issue a request to perform the stationary manual regeneration, and to receive permission from the user for the execution of the stationary manual regeneration. do.
- indication part 105 performs a 1st notification instruction
- the first notification instruction is a notification instruction requesting execution of stationary manual regeneration, but the degree of request is lower than that of the second notification instruction.
- the first notification instruction is, for example, a notification instruction to execute stationary manual regeneration at a time convenient for the user.
- the second notification instruction is a notification instruction requesting execution of stationary manual regeneration, and is a notification instruction with a higher degree of request than the first notification instruction.
- the second notification instruction is, for example, a notification instruction to immediately execute stationary manual regeneration.
- the temperature increase control (S203) it is also possible to notify from the monitor 8 that the stationary manual regeneration is possible for a certain period of time before the first notification instruction.
- the engine speed fixing control execution unit 106 executes the engine speed fixing control when the notification instruction unit 105 receives permission from the user to execute the stationary manual regeneration.
- the HC release control stop determination unit 107 determines whether the accumulated HC has been released (or whether it has decreased to a predetermined amount), and if it has been released (or has decreased to a predetermined amount), HC release control is stopped.
- FIG. 7 and 8 are flow charts showing an operation example of the engine control device 100 shown in FIG.
- FIG. 9 is a timing chart schematically showing an operation example of the engine control system 10 shown in FIG.
- the processing shown in FIG. 7 is repeatedly executed at a predetermined calculation cycle.
- the environmental condition determination unit 101 reads the intake manifold temperature, engine water temperature, engine speed, and DOC temperature (step S101).
- the environmental condition determination unit 101 selects the environmental condition (normal control or low temperature control) from the intake manifold temperature and the engine water temperature in the environmental condition determination map 211 (step S102).
- the HC deposition amount estimating unit 102 calculates the HC increase amount estimation map during normal control.
- the HC increase amount is estimated (step S104).
- the HC deposition amount estimation unit 102 uses the low temperature control HC increase amount estimation map 213 based on the engine speed and the DOC temperature. to estimate the HC increase amount (step S105).
- the HC deposition amount estimator 102 estimates the HC reduction amount in the HC reduction amount estimation map 214 based on the engine speed and the DOC temperature (step S106).
- the HC deposition amount estimating unit 102 estimates the HC deposition amount based on the HC deposition amount estimated value, the HC increase amount, and the HC decrease amount calculated in the previous calculation process (calculates the HC deposition amount estimated value ) (step S107), and the process shown in FIG. 7 is terminated.
- the processing shown in FIG. 8 is started when the engine control device 100 is started.
- the HC release control start determination unit 103 acquires the estimated HC deposition amount estimated by the HC deposition amount estimation unit 102 (step S201), and the estimated HC deposition amount is the determination value. It is determined whether or not the above is satisfied (step S202).
- the HC release control start determination unit 103 determines the HC deposition estimated by the HC deposition amount estimation unit 102 again after a certain period of time has elapsed. A volume estimate is obtained (step S201).
- the temperature increase control execution unit 104 starts temperature increase control through automatic regeneration (step S203).
- the notification instruction unit 105 executes the first notification instruction from the monitor 8 (step S204).
- the notification instruction unit 105 determines whether or not there is a response from the monitor 8 to the effect that the request for stationary manual regeneration is accepted in response to the first notification instruction (step S205).
- the engine speed fixing control execution unit 106 executes the engine speed fixing control (step S206). .
- step S207 determines whether a predetermined time has elapsed since the first notification instruction was issued. If the fixed time has not elapsed and there is no response to the effect that the request for stationary manual regeneration is accepted ("NO" in step S207 and "NO" in step S205), notification instruction unit 105 makes the determination in step S205. and the determination of step S207 are repeatedly executed.
- the notification instruction unit 105 executes a second notification instruction from the monitor 8 (step S208).
- the notification instruction unit 105 determines whether or not there is a response from the monitor 8 to the effect that the request for stationary manual regeneration is accepted in response to the second notification instruction (step S209).
- the engine speed fixing control execution unit 106 executes the engine speed fixing control (step S206). .
- step S209 If there is no response from the monitor 8 to the effect that the request for stationary manual regeneration is received ("NO” in step S209), the notification instruction unit 105 repeatedly executes the determination process in step S209 (from "NO” in step S209). repetition of step S209).
- the HC release control stop determination unit 107 acquires the HC deposition amount estimated value estimated by the HC deposition amount estimation unit 102 (step S210), and determines whether or not the deposited HC has been released (step S211). If the accumulated HC has not been released (“NO” in step S211), the HC release control stop determination unit 107 re-estimates the HC deposition amount estimated by the HC deposition amount estimation unit 102 after a certain period of time has elapsed. A value is acquired (step S210). On the other hand, if the accumulated HC has been released (“YES" in step S211), the HC release control stop determination unit 107 stops HC release control (step S212), and ends the processing shown in FIG. do.
- the flow of processing shown in FIG. 8 is an example and can be changed as appropriate.
- the HC release control stop determination unit 107 repeatedly acquires the estimated accumulated HC amount and determines whether or not the accumulated HC has been released. If it is determined that the second notification has been released, the second notification instruction may be withdrawn and the process may be returned to step S201.
- the normal control HC increase amount estimation map 212 and the low temperature control HC increase amount estimation map 213, which are examples of the first correspondence information, or the HC decrease amount estimation map 214, which is an example of the second correspondence information. is not limited to a map, and may be configured as a formula for calculating the HC increase amount or HC decrease amount using the engine speed and the DOC temperature as parameters. In this case, this formula is also an example of the first and second correspondence information.
- FIG. 9 schematically shows an example of temporal changes in estimated HC deposition amount, engine speed, DOC temperature, intake manifold temperature, and engine water temperature.
- the estimated HC deposit amount gradually increases.
- the HC deposition amount estimated value gradually decreases from time t2 to time t3.
- the rate of increase in the estimated HC deposition amount is higher during low temperature control than during normal operation, so although it decreases from time t2, the deposition amount is still greater at time t3 than during normal control. Then, when the engine 1 returns to the low load state at time t3, the HC deposition amount estimated value increases again during low temperature control, and exceeds the determination value at time t4 in the example shown in FIG.
- the DOC input HC inflow amount varies greatly depending on the engine speed depending on the outside air temperature. If the accumulation amount can be estimated with high accuracy corresponding to the change in the degree of dependence, the margin for the judgment value can be reduced. That is, when the estimation accuracy is high, the degree of margin for the determination value can be made smaller than when the accuracy is low.
- FIG. 22 is an explanatory diagram for explaining an operation example of the engine control system 10 shown in FIG. 1, and shows the relationship between the engine speed and the DOC input HC inflow amount.
- the engine control device 100 (hydrocarbon deposition amount estimating device) provides at least the first measured value corresponding to the intake air temperature of the internal combustion engine and the second measured value corresponding to the temperature of the cooling liquid of the internal combustion engine. and a third measured value corresponding to the exhaust gas flow rate of the internal combustion engine. Since the hydrogen) deposition amount estimating unit 102 is provided, the hydrocarbon (HC) deposition amount can be estimated appropriately and accurately.
- the engine control device 100 uses the third measured value, the fourth measured value corresponding to the temperature in the exhaust gas purification device 4, and the exhaust gas purification device 4 further includes a storage unit 108 that stores first correspondence information representing a correspondence relationship with the increase amount of HC deposited in the internal combustion engine according to environmental conditions of the internal combustion engine, and the HC deposition amount estimation unit 102 estimates the deposition amount.
- the amount of increase based on the environmental condition of the internal combustion engine determined based on the first measured value and the second measured value, the third measured value, the fourth measured value, and the first correspondence information to estimate
- the amount of increase in hydrocarbons (HC) is estimated appropriately and accurately using the first correspondence information corresponding to the environmental conditions, which can be configured using a map, a simple calculation formula, or the like. be able to.
- the storage unit 108 stores the second correspondence information representing the correspondence between the third measured value, the fourth measured value, and the decrease amount of HC deposited on the exhaust gas purification device 4.
- the HC deposition amount estimation unit 102 estimates the decrease amount based on the third measurement value, the fourth measurement value, and the second correspondence information when estimating the deposition amount.
- the amount of increase in hydrocarbons (HC) is estimated appropriately and accurately using the first correspondence information corresponding to the environmental conditions, which can be configured using a map, a simple calculation formula, or the like. be able to.
- the decrease amount of hydrocarbons (HC) can be estimated appropriately and accurately using the second correspondence information that can be configured using a map, a simple calculation formula, or the like.
- FIG. 10 is a block diagram showing a configuration example of the engine control device 100 (shown as engine control device 100a) shown in FIG.
- FIG. 11 is a block diagram showing a configuration example of a map included in fuel injection control map 301 shown in FIG.
- FIG. 12 is a schematic diagram showing a configuration example of the injection timing control map 311 shown in FIG.
- FIG. 13 is a schematic diagram showing a configuration example of the rail pressure control map 312 shown in FIG.
- FIG. 14 is a schematic diagram showing a configuration example of the pilot injection amount control map 313 shown in FIG.
- FIG. 10 is a block diagram showing a configuration example of the engine control device 100 (shown as engine control device 100a) shown in FIG.
- FIG. 11 is a block diagram showing a configuration example of a map included in fuel injection control map 301 shown in FIG.
- FIG. 12 is a schematic diagram showing a configuration example of the injection timing control map 311 shown in FIG.
- FIG. 13 is a schematic diagram showing a configuration example
- FIG. 15 is a schematic diagram showing a configuration example of the pilot injection period control map 314 shown in FIG.
- FIG. 16 is a schematic diagram showing a configuration example of the post-injection amount control map 315 shown in FIG.
- FIG. 17 is a flow chart showing an operation example of the engine control device 100a shown in FIG.
- the basic configuration of the engine control system 10 shown in FIG. 1 is the same as in the first embodiment.
- the configuration of an engine control device 100a shown in FIG. 10 which corresponds to the configuration of the engine control device 100 shown in FIG. 2, is partially different from the configuration of the engine control device 100 shown in FIG. That is, in the engine control device 100 shown in FIG. 2, the environmental condition determination unit 101 uses the environmental condition determination map 211 to determine the environmental conditions, whereas in the engine control device 100a shown in FIG. determines environmental conditions using the fuel injection control map 301 .
- the HC deposit amount estimation map 201 a stored in the storage unit 108 does not include the environmental condition determination map 211 . Further, the storage unit 108 newly stores the fuel injection control map 301 .
- the fuel injection control map 301 shown in FIG. 10 includes, as shown in FIG. , a pilot injection period control map 314 , and a post injection amount control map 315 .
- the injection timing control map 311 includes an environmental condition determination map 3111, a normal control map 3112, and a low temperature control map 3113.
- the environmental condition determination map 3111 is a map that defines environmental conditions using the engine coolant temperature and the intake manifold temperature as parameters. In this case, the environmental conditions are defined by three states: normal control, low temperature control, and interpolation control.
- the normal control map 3112 and the low temperature control map 3113 use the engine speed [rpm] and the injection amount [mg/st] of the main injection as parameters, and the injection timing [SOI BTDC deg] of the main injection during normal control and the low temperature This is a map that defines the injection timing [SOI BTDC deg] of the main injection during control.
- “st” is the stroke (stroke)
- “SOI BTDC deg” is the injection start (Start of Injection) before top dead center (Before Top Dead Center) angle.
- the injection amount of the main injection is determined, for example, according to the output signal of an accelerator sensor (not shown).
- the engine control device 100a determines the environmental conditions using the environmental condition determination map 3111 based on the engine coolant temperature and the intake manifold temperature. Further, when the environmental condition is normal control, the engine control device 100a uses the normal control map 3112 to determine the injection timing based on the engine speed and the injection amount of the main injection. Further, when the environmental condition is low temperature control, the engine control device 100a uses the low temperature control map 3113 to determine the injection timing based on the engine speed and the injection amount of the main injection. Further, when the environmental condition is interpolation control, the engine control device 100a uses the normal control map 3112 and the low temperature control map 3113 to calculate the value of the normal control map 3112 and the low temperature control map 3113 based on the engine speed and the injection amount of the main injection. As a result of interpolation processing (interpolation processing) using the values of the control map 3113, the injection timing is determined.
- interpolation processing interpolation processing
- the rail pressure control map 312 includes an environmental condition determination map 3121, a normal control map 3122, and a low temperature control map 3123.
- the environmental condition determination map 3121 is a map that defines environmental conditions using the engine coolant temperature and the intake manifold temperature as parameters. In this case, the environmental conditions are defined by three states: normal control, low temperature control, and interpolation control.
- the normal control map 3122 and the low temperature control map 3123 use the engine speed [rpm] and the injection amount [mg/st] of the main injection as parameters, and the rail pressure (common rail rail pressure) [bar] during normal control, It is a map that defines the rail pressure [bar] during low temperature control.
- the engine control device 100a determines the environmental conditions using the environmental condition determination map 3121 based on the engine coolant temperature and the intake manifold temperature. Further, when the environmental condition is normal control, the engine control device 100a determines the rail pressure based on the engine speed and the injection amount of the main injection using the normal control map 3122 . Further, when the environmental condition is low temperature control, the engine control device 100a determines the rail pressure based on the engine speed and the injection amount of the main injection using the low temperature control map 3123 . Further, when the environmental condition is interpolation control, the engine control device 100a uses the normal control map 3122 and the low temperature control map 3123 to calculate the value of the normal control map 3122 and the low temperature control map 3123 based on the engine speed and the injection amount of the main injection. As a result of interpolation processing (interpolation processing) using the values of the control map 3123, the rail pressure is determined.
- interpolation processing interpolation processing
- the pilot injection amount control map 313 includes an environmental condition determination map 3131, a normal control map 3132, and a low temperature control map 3133.
- the environmental condition determination map 3131 is a map that defines environmental conditions using the engine coolant temperature and the intake manifold temperature as parameters. In this case, the environmental conditions are defined by three states: normal control, low temperature control, and interpolation control.
- the normal control map 3132 and the low temperature control map 3133 use the engine speed [rpm] and the main injection amount [mg/st] as parameters, and the pilot injection amount [mg/st] during normal control and the pilot injection amount [mg/st] during low temperature control. is a map that defines the pilot injection amount [mg/st] of .
- the engine control device 100a determines the environmental conditions using the environmental condition determination map 3131 based on the engine coolant temperature and the intake manifold temperature.
- the engine control device 100a uses the normal control map 3132 to determine the pilot injection amount based on the engine speed and the injection amount of the main injection.
- the engine control device 100a uses the low temperature control map 3133 to determine the pilot injection amount based on the engine speed and the injection amount of the main injection.
- the engine control device 100a uses the normal control map 3132 and the low temperature control map 3133 to calculate the value of the normal control map 3132 and the low temperature control map 3133 based on the engine speed and the injection amount of the main injection.
- interpolation processing interpolation processing
- the pilot injection period control map 314 includes an environmental condition determination map 3141, a normal control map 3142, and a low temperature control map 3143.
- the environmental condition determination map 3141 is a map that defines environmental conditions using the engine coolant temperature and the intake manifold temperature as parameters. In this case, the environmental conditions are defined by three states: normal control, low temperature control, and interpolation control.
- the normal control map 3142 and the low temperature control map 3143 use the engine speed [rpm] and the injection amount [mg/st] of the main injection as parameters, and the pilot injection period [msec] during normal control and the pilot injection period [msec] during low temperature control. It is a map that defines the injection period [msec].
- the engine control device 100a determines the environmental conditions using the environmental condition determination map 3141 based on the engine coolant temperature and the intake manifold temperature. Further, when the environmental condition is normal control, the engine control device 100a determines the pilot injection period based on the engine speed and the injection amount of the main injection using the normal control map 3142 . Further, when the environmental condition is low temperature control, the engine control device 100a uses the low temperature control map 3143 to determine the pilot injection period based on the engine speed and the injection amount of the main injection.
- the engine control device 100a uses the normal control map 3142 and the low temperature control map 3143 to calculate the value of the normal control map 3142 and the low temperature control map 3143 based on the engine speed and the injection amount of the main injection. As a result of interpolation processing (interpolation processing) using the values of control map 3143, the pilot injection period is determined.
- the post-injection amount control map 315 includes an environmental condition determination map 3151, a normal control map 3152, and a low temperature control map 3153.
- the environmental condition determination map 3151 is a map that defines environmental conditions using the engine coolant temperature and the intake manifold temperature as parameters. In this case, the environmental conditions are defined by three states: normal control, low temperature control, and interpolation control.
- the normal control map 3152 and the low temperature control map 3153 use the engine speed [rpm] and the main injection amount [mg/st] as parameters, and the post injection amount [mg/st] during normal control and the post injection amount [mg/st] during low temperature control. is a map that defines the post-injection amount [mg/st] of .
- the engine control device 100a determines the environmental conditions using the environmental condition determination map 3151 based on the engine coolant temperature and the intake manifold temperature. Further, when the environmental condition is normal control, the engine control device 100a uses the normal control map 3152 to determine the post-injection amount based on the engine speed and the injection amount of the main injection. Further, when the environmental condition is low temperature control, the engine control device 100a uses the low temperature control map 3153 to determine the post injection amount based on the engine speed and the injection amount of the main injection.
- the engine control device 100a uses the normal control map 3152 and the low temperature control map 3153 to determine the value of the normal control map 3152 and the low temperature control map 3153 based on the engine speed and the injection amount of the main injection. As a result of interpolation processing (interpolation processing) using the values of the control map 3153, the post-injection amount is determined.
- the environmental condition determination unit 101a reads the intake manifold temperature, engine water temperature, engine speed, and DOC temperature (step S301).
- the environmental condition determination unit 101a determines the operating condition parameters (P1) to (P5) below from the intake manifold temperature and the engine water temperature using the environmental condition determination maps 3111, 3121, 3131, 3141 and 3151. It is determined whether or not normal control is to be performed (step S302).
- the parameter (P1) is the injection timing
- the parameter (P2) is the rail pressure
- the parameter (P3) is the pilot injection amount
- the parameter (P4) is the pilot injection period
- the parameter (P5) is the post injection amount.
- the HC deposit amount estimating unit 102 determines that all of the environmental conditions for the operating condition parameters (P1) to (P5) are “normal control” (“YES” in step S303), the engine Based on the rotational speed and the DOC temperature, the HC increase amount is estimated using the HC increase amount estimation map 212 during normal control (step S304). On the other hand, when it is determined that even one of the environmental conditions is not normal control (“NO” in step S303), the HC deposition amount estimation unit 102 calculates the HC during low temperature control based on the engine speed and the DOC temperature. The HC increase amount is estimated using the increase amount estimation map 213 (step S305).
- the HC deposition amount estimator 102 estimates the HC reduction amount in the HC reduction amount estimation map 214 based on the engine speed and the DOC temperature (step S306).
- the HC deposition amount estimating unit 102 estimates the HC deposition amount based on the HC deposition amount estimated value, the HC increase amount, and the HC decrease amount calculated in the previous calculation process (calculates the HC deposition amount estimated value ) (step S307), and the process shown in FIG. 17 is terminated.
- the engine control device 100 (hydrocarbon deposition amount estimating device) provides at least the first measured value corresponding to the intake air temperature of the internal combustion engine and the second measured value corresponding to the temperature of the cooling liquid of the internal combustion engine. and a third measured value corresponding to the exhaust gas flow rate of the internal combustion engine. Since the hydrogen) deposition amount estimating unit 102 is provided, the hydrocarbon (HC) deposition amount can be estimated appropriately and accurately.
- the environmental conditions include factors related to at least one of injection timing, rail pressure, pilot injection amount, pilot injection period, and post injection amount, which are related to fuel injection control of the internal combustion engine. Therefore, the environmental conditions can be defined as being more suitable for the content of the fuel injection control.
- FIG. 18 is a block diagram showing a configuration example of the engine control device 100 (shown as engine control device 100b) shown in FIG.
- FIG. 19 is a schematic diagram showing a configuration example of the HC increase estimation map 215 shown in FIG.
- FIG. 20 is a schematic diagram showing a configuration example of the correction gain map 216 shown in FIG.
- FIG. 21 is a flow chart showing an operation example of the engine control device 100b shown in FIG.
- the basic configuration of the engine control system 10 shown in FIG. 1 is the same as in the first embodiment.
- the configuration of an engine control device 100b shown in FIG. 18, which corresponds to the engine control device 100 shown in FIG. 2, is partially different from the configuration of the engine control device 100 shown in FIG.
- the environmental condition determination unit 101 determines the environmental conditions
- the environmental condition determination unit 101 is omitted.
- the HC deposition amount estimation map 201b stored in the storage unit 108 includes an HC decrease amount estimation map 214, an HC increase amount estimation map 215, and a correction gain map 216.
- the HC reduction amount estimation map 214 is the same as in the first embodiment.
- the HC increment estimation map 215 (first correspondence information) defines an HC increment estimation value [mg/s] using engine water temperature and intake manifold temperature as parameters.
- the correction gain map 216 (correction information) defines a gain for correcting the estimated HC increment defined in the HC increment estimation map 215 using the engine speed as a parameter.
- the HC accumulation amount estimating unit 102b determines an estimated HC increment using the HC increment estimation map 215 using the engine water temperature and the intake manifold temperature as parameters. Next, the HC deposition amount estimator 102b determines a gain value using the correction gain map 216 with the engine speed as a parameter. Then, the accumulated HC amount estimation unit 102b calculates the HC increment by multiplying the estimated HC increment by the determined gain. Note that the HC increment can be, for example, an increment value corresponding to the decrement value per calculation period calculated from the decrement amount of the HC reduction amount estimation map 214 and the calculation period.
- the HC deposition amount estimation unit 102b calculates the HC deposition amount estimation value based on the HC deposition amount estimation value, the HC increase amount, and the HC decrease amount calculated in the previous calculation process. calculate.
- HC is To increase.
- the flow of processing when the engine control device 100b shown in FIG. 18 estimates the amount of accumulated HC will be described.
- the processing shown in FIG. 21 is repeatedly executed at a predetermined calculation cycle.
- the HC deposit amount estimator 102b reads the intake manifold temperature, engine water temperature, engine speed, and DOC temperature (step S401).
- the HC deposition amount estimating unit 102b determines the HC increment estimation map 215 using the engine water temperature and the intake manifold temperature as parameters, and determines the HC increment estimation map 215 using the engine speed as a parameter.
- 216 is used to determine the gain value and calculate the corrected HC increment (step S402).
- the accumulated HC amount estimating unit 102b estimates the HC decrease amount using the HC decrease amount estimation map 214 (step S403).
- the HC deposition amount estimating unit 102b estimates the HC deposition amount based on the HC deposition amount estimated value, the HC increase amount, and the HC decrease amount calculated in the previous calculation process (calculates the HC deposition amount estimated value ) (step S404), and the process shown in FIG. 21 ends.
- the first correspondence information representing the correspondence between the first measured value, the second measured value, and the amount of increase in hydrocarbons deposited on the exhaust gas purification device 4, and the third measured value
- the HC deposit amount estimation unit 102b stores the first measurement value, the second measurement value, and the first correspondence information when estimating the deposition amount.
- the amount of increase is estimated by correcting the value estimated based on the third measurement value and the correction information. According to this configuration, the HC increase amount can be estimated more easily than in the first embodiment.
- the hydrocarbon (HC) deposition amount can be estimated appropriately and accurately.
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Abstract
Description
本願は、2021年2月26日に日本に出願された特願2021-030520号について優先権を主張し、その内容をここに援用する。
(エンジン制御システム10)
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、ターボチャージャー2と、排気通路3と、排気ガス浄化装置4と、モニタ8と、エンジン制御装置100と、エンジン水温センサ91と、吸気マニホールド温度センサ92と、エンジン回転センサ93とを備える。なお、図1では、本実施形態のエンジン制御システム10あるいはエンジン制御装置100において、排気ガス浄化装置4におけるHC(炭化水素)の堆積量を推定する機能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6を参照して、図1に示すエンジン制御装置100の構成例について説明する。図2は、図1に示すエンジン制御装置100の構成例を示すブロック図である。図3は、図2に示す環境条件判定マップ211の構成例を示す模式図である。図4は、図2に示す通常制御時HC増加量推定マップ212の構成例を示す模式図である。図5は、図2に示す低温制御時HC増加量推定マップ213の構成例を示す模式図である。図6は、図2に示すHC減少量推定マップ214の構成例を示す模式図である。
図7~図9を参照して、図2に示すエンジン制御装置100の動作例について説明する。図7および図8は、図2に示すエンジン制御装置100の動作例を示すフローチャートである。図9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チャートである。
図9は、HC堆積量の推定値と、エンジン回転数と、DOC温度と、吸気マニホールド温度と、エンジン水温の時間変化の例を模式的に示す。図9に示すように、t1でエンジン1が稼働し、時刻t2までエンジン1の低負荷状態(エンジン排気温の低い状態)が継続したとすると、HC堆積量推定値は徐々に増加する。時刻t2から時刻t3でエンジン1が低負荷状態からより負荷が大きい状態に変化すると、時刻t2から時刻t3までHC堆積量推定値は徐々に減少する。図9に示す例では、通常正常時に比べ低温制御時では、HC堆積量推定値の増加率が高いため、時刻t2から減少はしているが、時刻t3でも堆積量が通常制御時に比べ大きい。そして、時刻t3でエンジン1の低負荷状態に戻ると、低温制御時では、HC堆積量推定値は再び増加し、図9に示す例では時刻t4で判定値を超えている。
次に、図10~図17を参照して、本発明に係る第2実施形態について説明する。図10は、図1に示すエンジン制御装置100(エンジン制御装置100aとして示す。)の構成例を示すブロック図である。図11は、図10に示す燃料噴射制御用マップ301が含むマップの構成例を示すブロック図である。図12は、図11に示す噴射タイミング制御用マップ311の構成例を示す模式図である。図13は、図11に示すレール圧制御用マップ312の構成例を示す模式図である。図14は、図11に示すパイロット噴射量制御用マップ313の構成例を示す模式図である。図15は、図11に示すパイロット噴射期間制御用マップ314の構成例を示す模式図である。図16は、図11に示すポスト噴射量制御用マップ315の構成例を示す模式図である。図17は、図10に示すエンジン制御装置100aの動作例を示すフローチャートである。
次に、図18~図21を参照して、本発明に係る第3実施形態について説明する。図18は、図1に示すエンジン制御装置100(エンジン制御装置100bとして示す。)の構成例を示すブロック図である。図19は、図18に示すHC増加分推定マップ215の構成例を示す模式図である。図20は、図18に示す補正ゲインマップ216の構成例を示す模式図である。図21は、図18に示すエンジン制御装置100bの動作例を示すフローチャートである。
Claims (9)
- 少なくとも、内燃機関の吸気温度に対応する第1計測値と、前記内燃機関の冷却液体の温度に対応する第2計測値と、前記内燃機関の排気ガス流量に対応する第3計測値とに基づき、酸化触媒を備えた前記内燃機関の排気ガス浄化装置に堆積する炭化水素の堆積量を推定する炭化水素堆積量推定部
を備える炭化水素堆積量推定装置。 - 前記第3計測値と、前記排気ガス浄化装置内の温度に対応する第4計測値と、前記排気ガス浄化装置に堆積する炭化水素の増加量との対応関係を、前記内燃機関の環境条件に応じて表す第1対応関係情報を記憶する記憶部をさらに備え、
前記炭化水素堆積量推定部は、前記堆積量を推定する際に、前記第1計測値と前記第2計測値とに基づいて判定された前記内燃機関の環境条件と、前記第3計測値と、前記第4計測値と、前記第1対応関係情報とに基づいて前記増加量を推定する
請求項1に記載の炭化水素堆積量推定装置。 - 前記環境条件は、前記内燃機関の燃料噴射制御に係る、噴射タイミング、レール圧、パイロット噴射量、パイロット噴射期間、ポスト噴射量の少なくとも一つに係る要因を含む
請求項2に記載の炭化水素堆積量推定装置。 - 前記記憶部は、前記第3計測値と、前記第4計測値と、前記排気ガス浄化装置に堆積する炭化水素の減少量との対応関係を表す第2対応関係情報を、さらに記憶し、
前記炭化水素堆積量推定部は、前記堆積量を推定する際に、前記第3計測値と前記第4計測値と前記第2対応関係情報とに基づいて前記減少量を推定する
請求項2または3に記載の炭化水素堆積量推定装置。 - 前記第1計測値と、前記第2計測値と、前記排気ガス浄化装置に堆積する炭化水素の増加量との対応関係を表す第1対応関係情報と、前記第3計測値に基づく前記第1対応関係情報に対する補正情報とを記憶する記憶部をさらに備え、
前記炭化水素堆積量推定部は、前記堆積量を推定する際に、前記第1計測値と前記第2計測値と前記第1対応関係情報とに基づいて推定した値を、前記第3計測値と前記補正情報とに基づいて補正することで、前記増加量を推定する
請求項1に記載の炭化水素堆積量推定装置。 - 前記記憶部は、前記第3計測値と、前記排気ガス浄化装置内の温度に対応する第4計測値と、前記排気ガス浄化装置に堆積する炭化水素の減少量との対応関係を表す第2対応関係情報を、さらに記憶し、
前記炭化水素堆積量推定部は、前記堆積量を推定する際に、前記第3計測値と前記第4計測値と前記第2対応関係情報とに基づいて前記減少量を推定する
請求項5に記載の炭化水素堆積量推定装置。 - 少なくとも、内燃機関の吸気温度に対応する第1計測値と、前記内燃機関の冷却液体の温度に対応する第2計測値と、前記内燃機関の排気ガス流量に対応する第3計測値とに基づき、酸化触媒を備えた前記内燃機関の排気ガス浄化装置に堆積する炭化水素の堆積量を推定するステップ
を含む炭化水素堆積量推定方法。 - 少なくとも、内燃機関の吸気温度に対応する第1計測値と、前記内燃機関の冷却液体の温度に対応する第2計測値と、前記内燃機関の排気ガス流量に対応する第3計測値とに基づき、酸化触媒を備えた前記内燃機関の排気ガス浄化装置に堆積する炭化水素の堆積量を推定する炭化水素堆積量推定部と、
前記内燃機関の排気ガスの昇温制御を実行する昇温制御実行部と
を備える制御装置。 - 少なくとも、内燃機関の吸気温度に対応する第1計測値と、前記内燃機関の冷却液体の温度に対応する第2計測値と、前記内燃機関の排気ガス流量に対応する第3計測値とに基づき、酸化触媒を備えた前記内燃機関の排気ガス浄化装置に堆積する炭化水素の堆積量を推定する炭化水素堆積量推定部と、
前記内燃機関の排気ガスの昇温制御を実行する昇温制御実行部と
を備える制御装置と、
前記排気ガス浄化装置と
を備える排気ガス浄化システム。
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