EP1469180B1 - Verfahren zur Regelung eines NOx-Speicherkatalysators - Google Patents

Verfahren zur Regelung eines NOx-Speicherkatalysators Download PDF

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Publication number
EP1469180B1
EP1469180B1 EP04008984.9A EP04008984A EP1469180B1 EP 1469180 B1 EP1469180 B1 EP 1469180B1 EP 04008984 A EP04008984 A EP 04008984A EP 1469180 B1 EP1469180 B1 EP 1469180B1
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EP
European Patent Office
Prior art keywords
fuel
exhaust gas
combustion mode
low
predetermined
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EP04008984.9A
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English (en)
French (fr)
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EP1469180A3 (de
EP1469180A2 (de
Inventor
Tatsumasa Sugiyama
Masato Tsuzuki
Masahiko Ishikawa
Nobuki Kobayashi
Jun Tahara
Hidenaga Kato
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Toyota Industries Corp
Toyota Motor Corp
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Toyota Industries Corp
Toyota Motor Corp
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Publication of EP1469180A3 publication Critical patent/EP1469180A3/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • 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
    • F02D41/146—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 an NOx content or concentration
    • F02D41/1463—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 an NOx content or concentration of the exhaust gases downstream of exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • F02D41/028—Desulfurisation of NOx traps or adsorbent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
    • F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
    • F02D41/3035—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used a mode being the premixed charge compression-ignition mode

Definitions

  • the present invention relates to a method for managing NOx storage catalyst disposed in an exhaust passage of a diesel engine to reduce NOx in exhaust gas, and more specifically, to a method for reproducing the function of the NOx storage catalyst.
  • a NOx storage catalyst is equipped in the exhaust passage of, for example, a diesel engine to efficiently store the nitrogen oxides (NOx) in the exhaust gas under a condition in which the engine is operated by burning a lean air-fuel mixture.
  • the NOx storage catalyst has a property for storing NOx when the exhaust gas is in an oxidizing atmosphere, and releasing NOx when the exhaust gas is in a reducing atmosphere. If a reductant such as hydrocarbon (HC) is present in the exhaust gas, the NOx released into the exhaust gas quickly reacts with a reductant and reduces to nitrogen (N 2 ).
  • a reductant such as hydrocarbon (HC)
  • the NOx in the exhaust gas is efficiently reduced (purified) by appropriately switching the exhaust gas, flowing into the NOx storage catalyst, between the oxidizing atmosphere and the reducing atmosphere.
  • the fuel for the internal combustion engine contains sulfur components, and thus the exhaust gas contains, besides NOx, sulfur components originating from the sulfur components in the fuel.
  • Document DE 198 49 082 A1 describes a NOx storage catalyst and a method for managing the NOx storage catalyst.
  • the catalyst may be used in the exhaust passage of a diesel engine and store sulphur components which shall be released from time to time. For releasing these components, it is intended to decrease the air-fuel ratio of an air-fuel mixture which is to be burned in the engine in order to achieve that the sulphur components are released and reduced. This process for releasing and reducing the stored sulphur components is started when a predetermined starting condition is satisfied.
  • column 2 a release and reduction of the stored sulphur components is achieved when the air-fuel ration is decreased for a certain time period wherein the time period shall be long enough to achieve stable conditions for the release and reduction of the stored sulphur components. According to this method, the decrease of the air-fuel ratio and the provision of unbound HC components takes place simultaneously.
  • an internal combustion engine 1 (hereinafter referred to as an "engine") is an in-line, four cylinder diesel engine of which the main parts include a fuel injection system 10, a combustion chamber 20, an intake passage 30, and an exhaust passage 40.
  • the fuel injection system 10 includes a supply pump 11, a common rail 12, fuel injection valves 13, a fuel adding valve 14, an engine fuel passage P1, and a fuel adding passage P2.
  • the supply pump 11 raises the pressure of the fuel pumped from the fuel tank (not shown) to a high value and supplies the fuel to the common rail 12 through the engine fuel passage P1.
  • the common rail 12 functions as an accumulation chamber for keeping the high-pressure fuel supplied from the supply pump 11 at a predetermined pressure (accumulation pressure), and then allocates such stored fuel to each of the fuel injection valves 13.
  • Each fuel injection valve 13 is a solenoid valve incorporating an electromagnetic solenoid (not shown) and appropriately opens to inject or supply the fuel into the combustion chamber 20.
  • the supply pump 11 supplies some of the fuel pumped from the fuel tank to the fuel adding valve 14 through the fuel adding passage P2.
  • the fuel adding valve 14 is a solenoid valve incorporating an electromagnetic solenoid (not shown), and adds an appropriate amount of fuel, which functions as a reducing agent, to the upstream side of a catalytic casing 41 of the exhaust passage 40 at an appropriate timing.
  • a throttle valve 31 provided in the intake passage 30 is an electronically controlled switching valve having an opening angle that can be adjusted in a stepless manner.
  • the throttle valve 31 functions, under a predetermined condition, to change the flow area of the intake air and adjust the supply (flow) of the intake air.
  • the catalytic casing 41 is provided at the downstream side of the fuel adding valve 14 of the exhaust passage 40.
  • a known wall-flow particulate filter made mainly of a porous material is accommodated inside the catalytic casing 41.
  • a known storage-reduction type NOx storage catalyst (hereinafter referred to as NOx storage catalyst) is carried at the surface of the particulate filter.
  • the NOx storage catalyst consists of a NOx storage catalyst and a precious metal catalyst.
  • an oxygen concentration sensor 60 provided at the upstream side of the catalytic casing 41 of the exhaust passage 40 outputs a detection signal that continuously changes in response to the oxygen concentration in the exhaust gas.
  • the detection signal of the oxygen concentration sensor 60 reflects, besides the air-fuel ratio of the air-fuel mixture for the engine combustion, the amount of the reductant supplied to the exhaust gas through the fuel adding valve 14, and thus acts as an index directly representing the amounts of the oxidizing component (oxygen (O 2 ) and the like) and the reductant (hydrocarbon (HC) and the like) in the exhaust gas.
  • the component ratio of the oxidizing component and the reductant in the exhaust gas derived from the detection signal of the oxygen concentration sensor 60 is referred to as the air-fuel ratio (A/FEHT) of the exhaust gas.
  • A/FEHT air-fuel ratio
  • the air-fuel ratio of the exhaust gas becomes relatively low (richens) with respect to the air-fuel ratio A/F of the air-fuel mixture used for engine combustion.
  • the amount of the reducing agent supplied through the fuel adding valve 14 is "0", the air-fuel ratio of the exhaust gas is substantially equal to the air-fuel ratio of the air-fuel mixture for the engine combustion.
  • the oxygen concentration sensor 60 is electrically connected to an electronic control unit (ECU) 50.
  • ECU electronice control unit
  • the ECU 50 has a logic operation circuit consisting of a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM) a back-up RAM, a timer counter 95 and the like.
  • the ECU 50 performs various types of control relating to the operating state of the engine 1. For example, under a predetermined condition, the ECU 50 executes a control (feed-back control) to operate the fuel injection valve 13 so that the air-fuel ratio A/FEHT of the exhaust gas derived from the detection signal of the oxygen concentration sensor 60 converges or approaches a target value. Furthermore, under a predetermined condition,' the ECU 50, based on the operating state of the engine 1, executes a control (feed-forward control) to operate the fuel injection valve 13 with reference to a map (not shown) set in advance.
  • a control feed-forward control
  • the NOx storage catalyst consists of an NOx storage catalyst and a precious metal catalyst.
  • the NOx storage catalyst can store NOx if the oxygen concentration in the exhaust gas is high, and release the stored NOx if the oxygen concentration in the exhaust gas is low (concentration of the reductant is high). Furthermore, if HC or CO and the like are present in the exhaust gas when NOx is released into the exhaust gas, the precious metal catalyst oxides the HC and CO, and as a result, an oxidization-reduction reaction occurs between the NOx, or the oxidizing component, and the HC or CO, or the reductant. In other words, the HC or CO is oxidized to H 2 O or CO 2 , and the NOx is reduced to N 2 .
  • the NOx storage catalyst stores a predetermined limit amount of NOx even if the oxygen concentration in the exhaust gas is high, the NOx storage catalyst will not store the NOx more than the limit amount.
  • the reductant is intermittently supplied to the upstream side of the catalytic casing 41 of the exhaust passage 40 by adding fuel, and thus the concentration of the reductant in the exhaust gas increases.
  • the reductant periodically releases or reduce-purifies the NOx stored in the NOx storage catalyst. This recovers the NOx storage ability of the catalyst.
  • the sulfur components originating from the sulfur components contained in the fuel is accumulated in the NOx storage catalyst (or S poisoning occurs) as the engine operation continues.
  • the ECU 50 executes the sulfur process (S-process) control to remove the sulfur components accumulated in the NOx storage catalyst.
  • S-process control satisfies a particular condition defined by the air-fuel ratio A/FEHT of the exhaust gas exposed to the NOx storage catalyst by, for example, drive controlling the fuel adding valve 14 or controlling the combustion state of the engine 1.
  • Fig. 2 is one example of a time chart showing the transition of the air-fuel ratio A/FEHT of the exhaust gas observed when the S-process control is executed.
  • the ECU 50 When a request to execute the S-process control is made (time t1), the ECU 50 performs a pre-process (first process) to lower (richen) the air-fuel ratio A/FEHT of the exhaust gas to a predetermined target value (for example, about 25: hereinafter referred to as air-fuel ratio pre-process value) ⁇ so that the fuel, in an atomized state, supplied by fuel addition efficiently acts on,the NOx storage catalyst.
  • the pre-process may be performed by for example, narrowing the throttle valve 31, and reducing the amount of air drawn into the combustion chamber 20.
  • the pre-process may be performed by controlling the timing and the amount of fuel injection through the fuel injection valves 13. For example, besides carrying out most of the fuel injection near the compression top dead center to obtain engine power, a sub-fuel injection may be carried out at a different timing to lower (richen) the air-fuel ratio A/FEHT of the exhaust gas.
  • the air-fuel ratio A/FEHT of the exhaust gas After the air-fuel ratio A/FEHT of the exhaust gas reaches the air-fuel ratio pre-process value ⁇ with the pre-process, the actual process of releasing sulfur (S-discharging process, or second process) starts (time t2). With the start of the S-discharging process, the intermittent fuel addition is carried out through the fuel adding valve 14.
  • the bed temperature of the NOx storage catalyst increases to a predetermined value (for example, about 700°C), and is generally maintained at a constant value.
  • the easy release of sulfur components accumulated in the NOx storage catalyst is related to the air-fuel ratio A/FEHT of the exhaust gas.
  • the air-fuel ratio A/FEHT of exhaust gas lowers (richens), the sulfur components are released more efficiently.
  • the combustion state, moreover, the exhaust property of the engine is likely to change. This is because when the target value of the air-fuel ratio A/FEHT of the exhaust gas is greatly changed with the start of the pre-process, it becomes difficult for the air-fuel ratio A/FEHT of the exhaust gas to rapidly converge to the target value. As a result, when the S-discharging process starts at the same time as the start of the pre-process, or right after the start of the pre-process, the air-fuel ratio A/FEHT of the exhaust gas tends to easily deviate from the target value at the first step of the S-discharging process.
  • control to converge the air-fuel ratio A/FEHT of the exhaust gas to the target value is carried out as a feed-back control based on the detection signal of the oxygen concentration sensor 60, the fluctuation of the air-fuel ratio A/FEHT due to significant change in the target value also becomes significant.
  • the time needed for the air-fuel ratio A/FEHT of the exhaust gas to stabilize around the air-fuel ratio pre-process value ⁇ is set in advance as a stand-by time TS.
  • the S-discharging process starts after the stand-by time TS has elapsed.
  • the setting of the stand-by time TS is cancelled, and the S-discharging process starts at the same time as the start of the pre-process or right after the start of the pre-process.
  • the NOx storage catalyst purifies the excessive reductant more efficiently. Therefore, in the present embodiment, if the amount of intake air GA is less than a predetermined value, or if the O 2 storage effect of the NOx storage catalyst is high, the setting of the stand-by time TS is cancelled.
  • the O 2 storage ability decreases as time elapses when it is being used.
  • the NOx storage catalyst purifies the excessive reductant at a sufficiently high efficiency even if the excessive reductant flows into the NOx storage catalyst due to the air-fuel ratio A/FEHT of the exhaust gas.
  • a numercial index hereinafter referred to as a catalyst degradation index
  • CATDG that represents the extent of degradation of the NOx storage catalyst, such as duration of use of the NOx storage catalyst or the total flow of the exhaust gas that has passed the NOx storage catalyst, is derived. If the catalyst degradation index CATDG is less than a predetermined value, or if the O 2 storage effect of the NOx storage catalyst is high, the setting of the stand-by time TS is cancelled.
  • the feed-back control based on the detection signal of the oxygen concentration sensor 60 is carried out so that the air-fuel ratio A/FEHT of the exhaust gas converges to the target value.
  • the pre-process or the S-discharging process is performed, the deviation between the actual measurement value (value based on the signal of the oxygen concentration sensor 60) A/FEHT, which correspond to the operating state of various components (fuel injection valve 13, fuel adding valve 14, throttle valve 31 and the like) of the engine 1, and the target value are monitored, and the deviation is stored as a learning value FAFG.
  • the learning value FAFG is used to correct the operation of the fuel injection valve 13, the fuel adding valve 14, the throttle valve 31 and the like.
  • the speed and accuracy of converging the air-fuel ratio A/FEHT of the exhaust gas to the target value in the pre-process and the S-discharging process is improved.
  • the learning value FAFG is preferably set to be a numerical value that differs for every operating region (operating range determined by, for example, the load and the speed) of the engine 1.
  • Fig. 3 is a flow chart explaining specific procedures (routines) of the S-process according to the present embodiment. This routine is repeatedly executed at a predetermined time interval by means of the ECU 50 after the engine 1 is started.
  • the ECU 50 first acquires, in step S101, various information (for example, fuel injection amount Q or engine speed NE) that reflects the operating state of the engine 1.
  • various information for example, fuel injection amount Q or engine speed NE
  • step S102 the ECU 50 determines whether a request for the S-process is currently being made, that is, whether sulfur components exceeding the predetermined amount is accumulated in the NOx storage catalyst. If an affirmative decision (YES) is made in step S102, the processing by the ECU 50 proceeds to step S103. However, if a negative decision (NO) is made in step S102, the process of the ECU 50 branches off. A negative decision is made in step S102 not only in situations where the S-discharging process has not been carried out because there is no necessity for the S-discharging process, but also in situations where the S-discharging process has already been carried out and a sufficient amount of sulfur components have already released from the NOx storage catalyst. Furthermore, if the pre-process and the S-discharging process is being carried out when the negative decision is made in step S102, the ECU 50 interrupts (or terminates) the pre-process and the S-discharging process that are being performed in step S110.
  • step S103 the ECU 50 starts the pre-process (or continues the performance of the pre-process).
  • the ECU 50 sets the stand-by time TS that corresponds to both the start of the pre-process and the operating state of the engine 1, and starts time measurement.
  • the ECU 50 determines whether the intake air amount GA is greater than or equal to a predetermined value ⁇ (S104), whether the catalyst degradation index CATDG is greater than or equal to a predetermined value ⁇ (S105), and whether the air-fuel ratio learning is incomplete (S106). If an affirmative decision (YES) is made in all of steps S104, S105, and S106, the process by the ECU 50 proceeds to S107. However, if any of the decisions made in step S104, S105, or S106 is a negative decision (NO), the process by,the ECU 50 jumps to step S108. In step S108, the ECU 50 starts the S-discharging process (or continues to perform the S-discharging process).
  • step S107 the ECU 50 determines whether the duration time tx of the pre-process is greater than or equal to the stand-by time TS (set when starting the present pre-process), and if the decision is an affirmative decision (YES), the S-discharging process starts (or continues the performance of the S-discharging process) in step S108. On the other hand, if a negative decision (NO) is made in step S107, the process by the ECU 50 branches off.
  • the air-fuel ratio A/FEHT of the exhaust gas rapidly converges to the target value (value suited to release the sulfur components accumulated in the NOx storage catalyst).
  • the air-fuel ratio A/FEHT does not excessively decrease (richen) with the start of the S-discharging process.
  • the generation of white fumes or a sulfurous smell during the initial stage is effectively suppressed.
  • controllability of the air-fuel ratio of the exhaust gas by the second process is enhanced. For example, a complicated control configuration for confirming the stability of the air-fuel ratio A/FEHT of the exhaust gas is not necessary.
  • the learning value FAFG reflects the change amount in the air-fuel ratio of the exhaust gas resulting from the pre-process.
  • the amount of reducing agent that is added during the S-discharging process is optimally adjusted taking into consideration the change amount in the air-fuel ratio of the exhaust gas resulting from the pre-process.
  • the stand-by time TS is determined based on the operating state of the engine 1 at the time of the start of the pre-process. The effect of the present embodiment can still be obtained even if a predetermined numerical value is used. Furthermore, in accordance with the change in the operating state of the engine 1 after the start (during performance) of the pre-process, the stand-by time TS may be shortened or extended.
  • the control configuration for setting the stand-by time TS for example, the fluctuation width of the output of the oxygen concentration sensor 60 may be monitored and when determined that the air-fuel ratio of exhaust gas is sufficiently stable (air-fuel ratio of the exhaust gas is sufficiently converged to target value), the S-discharging process may be started.
  • the control configuration is more complicated but accuracy of control will be further improved.
  • the oxygen concentration sensor and the like may be installed at the downstream side of the NOx storage catalyst in the exhaust passage 40, and the catalyst degradation index CATDG may be calculated by referring to the history of transition of the detection signal of the oxygen concentration sensor 60 corresponding to the operating state of the engine 1.
  • step S104 of the S-process control routine a condition that "intake air amount is greater than or equal to the predetermined value" is adopted.
  • other conditions indicating that "any parameter related to intake air amount is greater than or equal to a predetermined value", such as “depression amount of accelerator pedal is greater than or equal to a predetermined value” or "fuel injection amount through the fuel injection valve 13 is greater than or equal to a predetermined value” can be set. That is, the parameter used in step S104 does not have to be the intake air amount itself as long as the parameter is related to the intake air amount.
  • the learning value FAFG adopted for the condition setting of step S106 in the S-process control routine is a parameter set with the performance of the feed-back control based on the detection signal of the oxygen concentration sensor 60.
  • the parameter is not limited to the learning value FAFG. As long as it is related to the amount of change of the air-fuel ratio of the exhaust gas resulting from the performance of the pre-process, other parameters having a similar meaning as the learning value FAFG can also be used as the parameter.
  • Fig. 4 shows a schematic configuration of an engine 1 according to the second embodiment.
  • the engine 1 is constructing by adding an EGR (exhaust gas recirculation) mechanism 71 to the engine 1 of the first embodiment.
  • the other parts of the engine 1 are the same as the engine 1 of the first embodiment.
  • the EGR mechanism 71 includes an EGR passage 72 and an EGR valve 73.
  • the EGR passage 72 connects the upstream side of the catalytic casing 41 in the exhaust passage 40 to the downstream side of the throttle valve 31 in the intake passage 30.
  • the EGR valve 73 opens and closes to change the flow area of the EGR passage 72 to adjust the flow of the recirculation exhaust gas (hereafter referred to as EGR gas).
  • EGR gas exhaust gas
  • the ECU 50 executes an opening angle control of the throttle valve 31 and an opening angle control of the EGR valve 73 based on the operating state of the engine 1. For example, an intake air amount feed-back control is carried out, in which the opening angle of the EGR valve 73 is adjusted, so that the intake air amount is the target intake air amount (target value per one revolution of engine 1) set based on the engine load (or fuel injection amount) and the engine speed NE. Furthermore, an EGR control is executed to adjust the opening angle of the throttle valve 31 and the opening angle of the EGR valve 73 so that the EGR efficiency is the target EGR efficiency set based on the engine load (or fuel injection amount) and the engine speed NE.
  • the combustion mode involved in the EGR control may be switched between two types of combustion modes, a normal combustion mode and a low-temperature combustion mode.
  • the low-temperature combustion mode is a combustion mode that slows the rise of the combustion temperature by introducing large amounts of EGR gas into the combustion chamber 20, and simultaneously reducing NOx and smoke.
  • a combustion mode other than the low-temperature combustion mode is the normal combustion mode for performing normal EGR control (i.e., no performance of EGR).
  • the low-temperature combustion mode with the introduction of large amounts of EGR gas into the combustion chamber 20, the amount of air drawn into the combustion chamber 20 decreases. This decrease the air-fuel ratio A/F of the mixture for combustion of the engine 1 and lowers the air-fuel ratio A/FEHT of the exhaust gas.
  • the pre-process of lowering the air-fuel ratio A/FEHT of the exhaust gas to the air-fuel ratio pre-process value ⁇ is achieved by performing the low-temperature combustion mode.
  • the optimum value of each of the parameters of the fuel injection system in the engine 1 such as the fuel injection time and the fuel injection amount differ.
  • the parameters of the fuel injection system also need to be changed to the optimum value (target value) that complies with the switched combustion mode.
  • target value the optimum value that complies with the switched combustion mode.
  • the fuel injection time is changed toward the advancing side
  • the fuel injection pressure is changed toward the increasing side
  • the fuel injection amount is changed toward the increasing side.
  • the fuel injection pressure is increased with the advancement of the fuel injection time because in the low-temperature combustion mode, a large amount of EGR gas is present in the combustion chamber 20 thus reducing ignitability.
  • the fuel injection amount is increased because in the low-temperature combustion mode, the output torque of the diesel engine 1 tends to lower with the introduction of a large amount of EGR gas into the combustion chamber 20. Thus, lowering of output torque needs to be suppressed.
  • steps S203, S207, and S211 differ from the first embodiment, but the other steps S201, S203-S206, S208, and S210 correspond to steps S101, S103-S106, S108, and S110 in the flow chart of Fig. 3 according to the first embodiment.
  • step S201 various information that reflects the operating state of the engine 1 is acquired, and in step S202, a determination is made as to whether a request for the S-process is being made. If an affirmative decision (YES) is made, the low-temperature , combustion mode starts (or performance of low-temperature combustion mode continues) to perform the S-process in step S203. With the performance of the low-temperature combustion mode, the pre-process is achieved and the air-fuel ratio A/FEHT of the exhaust gas begins to decrease toward the air-fuel ratio pre-process value ⁇ .
  • step S203 after the start of the low-temperature combustion mode (pre-process), a permission flag F for determining whether the S-discharging process should be performed is set to "1" (permitted) under a predetermined condition. If a negative decision (NO) is made in step S202, and when the low-temperature combustion mode (pre-process) or the S-discharging process is being performed, such processes are interrupted or terminated (step S210). Furthermore, the permission flag F is set to "0" (prohibited) (S211).
  • step S204 determinations are made as to whether the intake amount GA is greater than or equal to a predetermined value ⁇ (S204), whether the catalyst degradation index CATDG is greater than or equal to a predetermined value ⁇ (S205), and whether the air-fuel ratio learning is incomplete (S206). If an affirmative decision (YES) is made in all of steps S204, S205, and S206, the process proceeds to S207. In step S207, a determination is made as to whether the permission flag F for determining whether to perform the S-discharging process is "1" (permitted).
  • step S207 If the permission flag F is "1" (permitted) under a predetermined condition after performing the low-temperature combustion mode, an affirmative decision (YES) is made in step S207. If the decision made in step S207 is YES, the procedure proceeds to step S208 and the S-discharging process is performed (or the S-discharging process is continued), and intermittent fuel addition is carried out through the fuel adding valve 14.
  • step S208 When a negative decision (NO) is made in any of steps S204, S205, or S206, the process jumps to step S208 to perform the S-discharging process irrespective of whether or not the permission flag F is "1" (permitted).
  • the permission flag F is set to "1" (permitted) under a predetermined condition after the start of the low-temperature combustion mode for performing the S-process.
  • the throttle valve 31 is controlled to the close side and the EGR valve 73 is controlled to the open side to introduce a large amount of EGR gas into the combustion chamber 20.
  • the parameters of the fuel injection system such as the fuel injection time, the fuel injection pressure, and the fuel injection amount, are controlled to values suited to the low-temperature combustion mode.
  • the change in each parameter is started with a predetermined delay, in other words, with a delay corresponding to the response delay of the flow of the EGR gas, from the start (t3) of the low-temperature combustion mode. More specifically, a delay counter value C1 decremented for each fuel injection of the engine 1 is set to a initial value greater than "0" as shown in Fig. 6(b) , and when such delay counter value C1 reaches "0" (timing t4), each parameter starts to change. By delaying the start of change of each parameter, the above mentioned problem would not occur.
  • a predetermined period after the start of change of each parameter is a graduating period in which the parameters are gradually changed.
  • a graduating period is set to avoid sudden change of each parameter and to suppress, for example, shocks involved in such sudden change.
  • a graduation counter value C2 in Fig. 6(e) is used to set the above mentioned graduating period.
  • the graduation counter value C2 is set to an initial value, which is greater than "0", when the delay counter value C1 reaches "0" (timing t4), and is decremented for each fuel injection of the engine 1.
  • the graduating period is the period when the graduation counter value C2 is greater than "0" (t4-t5), and the initial value of the graduation counter value C2 is set so that changes of each parameter will be completed during the graduating period.
  • the transition of one of the parameters, the fuel injection amount, during the graduating period is shown in Fig. 6(f) .
  • the permission flag F is set to "1" (permitted) as shown in Fig. 6(g) .
  • the S-discharging process in step S208 starts if an affirmative decision (YES) is made in step S207 in Fig. 5 .
  • the S-discharging process starts when the permission flag F becomes "1" after the start of the low-temperature combustion mode (pre-process).
  • the S-discharging process will not be performed until the permission flag F is "1", in other words, as long as the graduation counter value C2 is greater than "0", and during such time, the air-fuel ratio A/FEHT of exhaust gas begins to stabilize.
  • the S-discharging process starts after the air-fuel ratio A/FEHT of the exhaust gas is stabilized. This quickly converges the air-fuel ratio A/FEHT to the target value after the start of the S-process.
  • Such increase in the fuel injection amount for each fuel injection influences the air-fuel ratio A/FEHT of the exhaust gas during the performance of the low-temperature combustion mode (pre-process).
  • the graduation counter value C2 is decremented for each fuel injection, and thus is a value related to the influence on the air-fuel ratio A/FEHT of the exhaust gas involved in the increase of fuel injection amount for each fuel injection.
  • the S-discharging process starts in response to the graduation counter value C2, or based on the fact that the graduation counter value C2 reached "0".
  • the S-discharging process is started at a suitable timing related to the air-fuel ratio A/FEHT of the exhaust gas.
  • the delay counter value C1 is decremented for each fuel injection to approach "0". In other words, the number of fuel injections from when the low-temperature combustion mode starts is counted, and the counter value approaches a first permission value whenever fuel is injected.
  • the parameters are graduated to values that comply with the low-temperature combustion mode (S310), and the graduation counter value C2 is decremented (S311). Therefore, when one of the parameters, the fuel injection amount, gradually increases or graduates for each fuel injection toward a value that complies with the low-temperature combustion mode, the graduation counter value C2 is also decremented to approach "0" for each fuel injection. In other words, after the number of fuel injections reaches the first permission value, the fuel injection amount is gradually increased to the predetermined target value, which is optimum for the low-temperature combustion mode, until or before the number of fuel injections further reaches the predetermined second permission value.
  • the S-discharging process is started based on the graduation counter value C2, which is decremented for each fuel injection in accordance with the increase in the fuel injection amount, that is, based on the fact that the graduation counter value C2 has decreased from the initial value to the permission value of "0".
  • the S-discharging process is started when the number of fuel injections reaches the predetermined permission value. As a result, the S-discharging process is started at a suitable timing even in the engine 1 in which the fuel injection amount increases with the performance of the low-temperature combustion mode.
  • the addition of the reducing agent (fuel) to the upstream side of the NOx storage catalyst through the fuel adding valve 14 by the S-discharging process is carried out when the decrease of the air-fuel ratio A/FEHT of the exhaust gas to the air-fuel ratio pre-process value ⁇ has not yet advanced in the low-temperature combustion mode (pre-process).
  • pre-process low-temperature combustion mode
  • a pre-process is performed to decrease the air-fuel ratio of the air-fuel mixture that is to be burned in the engine so that the air-fuel ratio A/FEHT of the exhaust gas reaches a predetermined pre-process value ⁇ .
  • the time required for the air-fuel ratio A/FEHT of the exhaust gas to stabilize near the pre-process value ⁇ is set as a stand-by time TS.
  • the sulfur discharging process starts after the stand-by time elapses. This enhances the convergence of the air-fuel ratio A/FEHT to the target value during the sulfur discharging process. If a predetermined condition is satisfied, the stand-by time is cancelled to start the sulfur discharging process when or just after the pre-process is started. This efficiently processes the sulfur components accumulated in a NOx storage catalyst, which is arranged in an exhaust passage of the engine, without deteriorating the exhaust gas property.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Claims (10)

  1. Verfahren zum Regeln eines NOx-Speicherkatalysators, der in einem Abgasdurchlass (40) einer Diesel-Kraftmaschine zum Reduzieren von NOx in dem Abgas angeordnet ist, wobei das Verfahren ein Freigeben von Schwefelkomponenten umfasst, die in dem NOx-Speicherkatalysator angesammelt sind, wobei das Freigeben einen ersten Prozess zur Senkung des Luft-Kraftstoff-Verhältnisses einer Luft-Kraftstoffmischung, die in der Kraftmaschine (1) zu verbrennen ist, und einen zweiten Prozess zum Hinzufügen eines Reduktionsmittels zu einer stromaufwärtigen Seite des NOx-Speicherkatalysators in dem Abgasdurchlass (40) umfasst, indem ein Reduktionsmittel durch ein Ventil (14) zu dem Abgasdurchlass (40) stromaufwärts von dem NOx-Speicherkatalysator zugeführt wird, wobei
    der zweite Prozess dann gestartet wird, wenn eine vorbestimmte Startbedingung erfüllt ist, nachdem der erste Prozess gestartet wurde, wobei die Startbedingung diejenige ist, dass das Luft-Kraftstoff-Verhältnis eines Stromaufwärtsseiten-Abgases, das das Abgas in der stromaufwärtigen Seite des NOx-Speicherkatalysators in dem Abgasdurchlass (40) ist, stabil ist, dadurch gekennzeichnet, dass
    die Startbedingung aufgehoben wird, um den zweiten Prozess gleichzeitig mit dem Start des ersten Prozesses oder unmittelbar nach dem Start des ersten Prozesses zu starten, wenn eine vorbestimmte Bedingung erfüllt ist, die die O2-Speicherfähigkeit des NOx-Speicherkatalysators oder die Änderungsmenge in dem Luft-Kraftstoff-Verhältnis des Stromaufwärtsseiten-Abgases betrifft, die auf den ersten Prozess zurückzuführen ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Startbedingung diejenige ist, dass eine vorbestimmte Zeit, die zur Stabilisierung des Luft-Kraftstoff-Verhältnisses des Stromaufwärtsseiten-Abgases erforderlich ist, verstreicht, nachdem der erste Prozess gestartet wurde.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Startbedingung aufgehoben wird, wenn ein Parameter, der die Einlassluftmenge der Kraftmaschine (1) betrifft, weniger ist als ein vorbestimmter Wert.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Startbedingung aufgehoben wird, wenn ein Parameter, der ein Verschlechterungsniveau des NOx-Speicherkatalysators betrifft, weniger ist als ein vorbestimmter Wert.
  5. Verfahren nach einem der Ansprüche 1 bis 4, ferner gekennzeichnet durch:
    ein Erfassen einer Änderungsmenge des Luft-Kraftstoff-Verhältnisses des Stromaufwärtsseiten-Abgases, die auf den ersten Prozess zurückzuführen ist, und ein Lernen der Änderungsmenge, wobei die Startbedingung aufgehoben wird, nachdem das Lernen abgeschlossen ist.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Startbedingung diejenige ist, dass die Anzahl der Kraftstoffeinspritzungen in eine Verbrennungskammer (20) der Kraftmaschine (1) größer als oder gleich einem vorbestimmten Wert wird, nachdem der erste Prozess gestartet wurde.
  7. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Startbedingung diejenige ist, dass ein Zählwert, der jedes Mal verringert wird, wenn Kraftstoff in eine Verbrennungskammer (20) der Kraftmaschine (1) eingespritzt wird, auf einen vorbestimmten Wert oder weniger sinkt, nachdem der erste Prozess gestartet wurde.
  8. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass:
    die Kraftmaschine (1) eine Abgasrückführungs-Steuerung durchführt und die Verbrennungsbetriebsarten zwischen einer Niedertemperatur-Verbrennungsbetriebsart zum Ansaugen einer relativ großen Menge des rückgeführten Abgases in eine Verbrennungskammer (20) der Kraftmaschine (1), und einer Normal-Verbrennungsbetriebsart umschaltet;
    nachdem die Niedertemperatur-Verbrennungsbetriebsart gestartet wurde, die Menge des in die Verbrennungskammer (20) eingespritzten Kraftstoffs allmählich auf einen vorbestimmten Zielwert zunimmt, der für die Niedertemperatur-Verbrennungsbetriebsart geeignet ist, bis oder bevor die Anzahl der Kraftstoffeinspritzungen in die Verbrennungskammer (20) einen vorbestimmten zulässigen Wert erreicht;
    der erste Prozess durchgeführt wird, indem die Niedertemperatur-Verbrennungsbetriebsart durchgeführt wird; und
    die Startbedingung diejenige ist, dass die Anzahl der Kraftstoffeinspritzungen in die Verbrennungskammer (20) größer als oder gleich dem vorbestimmten zulässigen Wert wird, nachdem die Niedertemperatur-Verbrennungsbetriebsart gestartet wurde.
  9. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass:
    die Kraftmaschine (1) eine Abgasrückführungs-Steuerung durchführt und die Verbrennungsbetriebsarten zwischen einer Niedertemperatur-Verbrennungsbetriebsart zum Ansaugen einer relativ großen Menge des rückgeführten Abgases in eine Verbrennungskammer (20) der Kraftmaschine (1), und einer Normal-Verbrennungsbetriebsart umschaltet;
    nachdem die Niedertemperatur-Verbrennungsbetriebsart gestartet wurde, eine Einspritz-Kraftstoffmenge in die Verbrennungskammer (20) allmählich auf einen vorbestimmten Zielwert zunimmt, der für die Niedertemperatur-Verbrennungsbetriebsart geeignet ist, bis oder bevor ein Zählwert, der jedes Mal verringert wird, wenn Kraftstoff in die Verbrennungskammer (20) eingespritzt wird, von einem vorbestimmten Anfangswert auf einen vorbestimmten zulässigen Wert sinkt;
    der erste Prozess durchgeführt wird, indem die Niedertemperatur-Verbrennungsbetriebsart durchgeführt wird; und
    die Startbedingung diejenige ist, dass der Zählwert weniger als oder gleich dem vorbestimmten zulässigen Wert wird, nachdem die Niedertemperatur-Verbrennungsart gestartet wurde.
  10. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass:
    die Kraftmaschine (1) eine Abgasrückführungs-Steuerung durchführt und die Verbrennungsbetriebsarten zwischen einer Niedertemperatur-Verbrennungsbetriebsart zum Ansaugen einer relativ großen Menge des rückgeführten Abgases in eine Verbrennungskammer (20) der Kraftmaschine (1), und einer Normal-Verbrennungsbetriebsart umschaltet;
    ein Öffnungsgrad eines AGR-Ventils, das die Menge des rückgeführten Abgases einstellt, die in die Verbrennungskammer (20) angesaugt wird, dann erhöht wird, und ein Öffnungsgrad eines Drosselventils, das die Einlassluftmenge einstellt, die in die Verbrennungskammer angesaugt wird, dann abgesenkt wird, wenn die Niedertemperatur-Verbrennungsbetriebsart gestartet wurde;
    nachdem die Anzahl der Kraftstoffeinspritzungen in die Verbrennungskammer (20) einen vorbestimmten ersten zulässigen Wert seit dem Start der Niedertemperatur-Verbrennungsbetriebsart erreicht, die Menge des in die Verbrennungskammer (20) eingespritzten Kraftstoffs allmählich auf einen vorbestimmten Zielwert zunimmt, der für die Niedertemperatur-Verbrennungsbetriebsart geeignet ist, bis oder bevor die Anzahl der Kraftstoffeinspritzungen einen vorbestimmten zweiten zulässigen Wert nach dem vorbestimmten ersten zulässigen Wert erreicht;
    der erste Prozess durchgeführt wird, indem die Niedertemperatur-Verbrennungsbetriebsart durchgeführt wird; und
    die Startbedingung diejenige ist, dass die Anzahl der Kraftstoffeinspritzungen größer als oder gleich dem vorbestimmten zweiten zulässigen Wert wird, nachdem die Niedertemperatur-Verbrennungsbetriebsart gestartet wurde.
EP04008984.9A 2003-04-15 2004-04-15 Verfahren zur Regelung eines NOx-Speicherkatalysators Expired - Fee Related EP1469180B1 (de)

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JP4349423B2 (ja) * 2007-03-01 2009-10-21 トヨタ自動車株式会社 内燃機関の排気浄化システム
DE102008059698A1 (de) * 2008-11-29 2010-06-02 Daimler Ag Verfahren zum Betreiben eines Dieselmotors mit einer einen Stickoxid-Speicherkatalysator aufweisenden Abgasreinigungsanlage
JP7010003B2 (ja) * 2018-01-09 2022-01-26 株式会社デンソー 噴射制御装置

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EP0892158B1 (de) * 1997-07-19 2003-02-12 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zur Überwachung der De-Sulfatierung bei NOx-Speicherkatalysatoren
DE19731623B4 (de) * 1997-07-23 2006-11-23 Volkswagen Ag Verfahren und Vorrichtung zur De-Sulfatierung von NOx-Speichern bei Dieselmotoren
DE19849082A1 (de) * 1998-08-07 2000-02-10 Volkswagen Ag Verfahren zur temperatur- und lambdaabhängigen De-Sulfatierung eines NOx-Speicherkatalysators
DE10158568A1 (de) * 2001-11-29 2003-06-26 Bosch Gmbh Robert Verfahren und Anlage zur Regenerierung insbesondere Desulfatisierung eines Speicherkatalysators bei der Abgasreinigung

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EP1469180A2 (de) 2004-10-20

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