WO2011148461A1 - 内燃機関の制御装置 - Google Patents
内燃機関の制御装置 Download PDFInfo
- Publication number
- WO2011148461A1 WO2011148461A1 PCT/JP2010/058816 JP2010058816W WO2011148461A1 WO 2011148461 A1 WO2011148461 A1 WO 2011148461A1 JP 2010058816 W JP2010058816 W JP 2010058816W WO 2011148461 A1 WO2011148461 A1 WO 2011148461A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel ratio
- air
- applied voltage
- amount
- discharge
- Prior art date
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/01—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust by means of electric or electrostatic separators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/28—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a plasma reactor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to a control device for an internal combustion engine, and more particularly to a control device for an internal combustion engine provided with a corona discharge type exhaust purification device.
- a control device for an internal combustion engine provided with a corona discharge type exhaust purification device is known.
- This exhaust purification device burns particulate matter (PM) in exhaust gas by generating corona discharge in the exhaust gas.
- the energy input into the exhaust gas by corona discharge is set to be equal to or higher than the activation energy required for PM combustion (oxidation) to efficiently purify PM.
- the input energy is controlled so that the input energy during corona discharge is equal to or higher than the oxidation energy of PM.
- the PM purification capacity also varies depending on the exhaust air-fuel ratio during corona discharge.
- the input energy control since the exhaust air / fuel ratio is not taken into consideration, depending on the operating state of the engine, the input energy control may not be adapted to the exhaust air / fuel ratio, and the PM purification ability is stably exhibited. There is a problem that can not be.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to appropriately control the state of corona discharge in accordance with the exhaust air-fuel ratio, so that the PM in the exhaust gas is always efficiently controlled.
- An object of the present invention is to provide a control device for an internal combustion engine that can be purified.
- the 1st invention has the corona discharge part which generate
- the exhaust gas purification apparatus which purifies the particulate matter in exhaust gas by a corona discharge, Air-fuel ratio detection means for detecting the exhaust air-fuel ratio; Power supply control means for supplying power to the corona discharge part of the exhaust purification device, wherein the power supply state to the corona discharge part is controlled based on the exhaust air-fuel ratio; It is characterized by providing.
- the power supply control means includes an applied voltage control means for controlling an applied voltage applied to the corona discharge section in a rich region where the exhaust air-fuel ratio is richer than the stoichiometric air-fuel ratio.
- the applied voltage control means is configured to decrease the applied voltage as the exhaust air-fuel ratio becomes rich in the rich region.
- the power supply control means includes discharge current control means for controlling a discharge current flowing through the corona discharge portion in a lean region where the exhaust air-fuel ratio is leaner than the stoichiometric air-fuel ratio.
- the discharge current control means is configured to decrease the discharge current as the exhaust air-fuel ratio becomes leaner in the lean region.
- the discharge current control means has an air-fuel ratio boundary value that is a predetermined air-fuel ratio in the lean region, and the exhaust air-fuel ratio is between the stoichiometric air-fuel ratio and the air-fuel ratio boundary value. If the exhaust air / fuel ratio is leaner, the discharge current is increased as the exhaust air / fuel ratio becomes leaner. If the exhaust air / fuel ratio is leaner than the air / fuel ratio boundary value, the exhaust air / fuel ratio becomes leaner. The discharge current is reduced as much as possible.
- the seventh invention comprises a PM amount calculating means for calculating a PM amount, which is the amount of particulate matter contained in the exhaust gas, based on at least the exhaust air-fuel ratio, the engine temperature, and the fuel injection timing,
- the applied voltage control means is configured to calculate the applied voltage based on the PM amount.
- the eighth invention comprises a discharge current estimating means for estimating a discharge current flowing when a virtual voltage is applied to the corona discharge unit based on at least the virtual voltage and the amount of PM,
- the applied voltage control means is configured to calculate a virtual voltage when the estimated value of the discharge current satisfies a required value necessary for purification of particulate matter as an actual applied voltage.
- the ninth invention comprises an arc discharge preventing means for limiting an applied voltage applied to the corona discharge section to a voltage range in which arc discharge does not occur.
- a tenth aspect of the present invention is a PM amount calculating means for calculating a PM amount that is an amount of particulate matter contained in exhaust gas based on at least the exhaust air-fuel ratio, the engine temperature, and the fuel injection timing;
- a virtual voltage is applied between the two electrodes constituting the corona electrode part, the reach distance of the discharge generated from one electrode to the other electrode is calculated based on at least the virtual voltage and the PM amount.
- a discharge distance calculating means, The arc discharge preventing means is configured to limit the applied voltage based on a virtual voltage when the reach distance of the discharge becomes equal to the distance between the electrodes.
- the power supply control means determines the power supply state (applied voltage and discharge current) to the exhaust purification device in accordance with the tendency of the PM purification rate in each air-fuel ratio region, the tendency of the occurrence probability of arc discharge, and the like. ) Can be controlled appropriately. Therefore, the state of corona discharge can be appropriately controlled in a wide air-fuel ratio region extending from the rich region to the lean region, and the PM purification rate can be stably improved while preventing arc discharge.
- the applied voltage control means can control the applied voltage in the rich region to prevent arc discharge, and can improve the PM purification rate in a range where arc discharge does not occur.
- the applied voltage control means can reduce the applied voltage by an amount corresponding to the rich air-fuel ratio and prevent arc discharge.
- the amount of decrease in applied voltage can be minimized according to the air-fuel ratio, and the PM purification rate can be improved.
- the discharge current control means can easily control the discharge current in the lean region. According to the control of the discharge current, the discharge current that is substantially proportional to the PM purification rate can be controlled, and the PM purification rate can be maximized accurately and easily.
- the PM discharge amount in the lean region where the amount of PM in the exhaust gas is small, the PM discharge amount can be sufficiently suppressed even if the discharge current is reduced.
- the discharge current control means can decrease the discharge current as the air-fuel ratio becomes leaner, and can reduce the PM emission amount with the minimum necessary energy. Therefore, the power consumption of the exhaust purification device can be suppressed and PM can be efficiently purified.
- the sixth aspect of the invention in the region where the air-fuel ratio is between the theoretical air-fuel ratio and the air-fuel ratio boundary value (lightly lean region), there is a characteristic that the PM purification rate decreases rapidly. For this reason, in the light lean region, the characteristic that the PM purification rate rapidly decreases can be compensated by increasing the discharge current as the air-fuel ratio becomes leaner.
- the region where the air-fuel ratio is leaner than the air-fuel ratio boundary value severe lean region
- the amount of PM generated is extremely small, so even if the discharge current is reduced, the amount of PM emission can be reduced. it can. For this reason, in the severe lean region, the discharge current can be reduced as the air-fuel ratio becomes leaner, and the power consumption of the exhaust emission control device can be suppressed.
- the applied voltage control means can calculate the applied voltage based on the amount of PM in the exhaust gas.
- the state of parameters required for oxidizing the PM in the exhaust gas such as required applied energy, air-fuel ratio, engine temperature, fuel injection timing, etc. can be reflected in the applied voltage, and applied according to each parameter.
- the voltage can be appropriately controlled.
- the discharge current estimating means can estimate the discharge current based on the virtual voltage to be applied and the PM amount.
- the applied voltage control means adjusts the applied voltage based on the estimated discharge current before applying the actual voltage so that necessary and sufficient applied energy is applied to the PM amount in the exhaust gas.
- the applied voltage can be optimized. Accordingly, it is possible to prevent insufficient energy applied during corona discharge or to apply more energy than necessary, and it is possible to efficiently purify PM while suppressing power consumption.
- the arc discharge preventing means can limit the applied voltage to a voltage range in which arc discharge does not occur. This eliminates the need for inefficient control for reducing the applied voltage after the occurrence of arc discharge, and it is possible to efficiently purify PM while preventing arc discharge in advance.
- the arc discharge preventing means can limit the applied voltage based on the virtual voltage when the reach distance of the discharge becomes equal to the distance between the electrodes. Therefore, before applying an actual voltage, the voltage to be applied can be set to the maximum voltage value in a range where arc discharge does not occur. Therefore, the maximum PM purification rate can be obtained while preventing arc discharge.
- Embodiment 1 of this invention It is a whole block diagram for demonstrating the system configuration
- Embodiment 1 of this invention it is a flowchart of the control performed by ECU.
- Embodiment 2 of this invention it is a characteristic diagram which shows the relationship between an exhaust air fuel ratio and the number of PM particles in exhaust gas. It is a characteristic diagram which shows the relationship between fuel injection timing and the number of PM particles in exhaust gas. It is a characteristic line figure which shows the relationship between the characteristic line in FIG. 11, and engine water temperature. It is a characteristic diagram which shows the relationship between the amount of cylinder injection and the number of PM particles. This is map data for determining the basic applied voltage based on the required applied energy and the PM amount.
- Embodiment 2 of this invention it is a flowchart which shows the applied voltage control performed by ECU. In Embodiment 2 of this invention, it is a flowchart which shows the calculation process of PM amount performed by ECU. In Embodiment 2 of this invention, it is a flowchart which shows the estimation process of the discharge current performed by ECU. In Embodiment 3 of this invention, it is a flowchart which shows the applied voltage correction
- FIG. 1 is an overall configuration diagram for explaining a system configuration according to the first embodiment of the present invention.
- the system of the present embodiment includes a direct injection engine 10 as an internal combustion engine.
- Each cylinder of the engine 10 has a combustion chamber 14 defined by a piston 12, and the piston 12 is connected to a crankshaft 16 that is an output shaft of the engine 10.
- the engine 10 also includes an intake passage 18 that sucks intake air into each cylinder, and an exhaust passage 20 through which exhaust gas is discharged from each cylinder.
- the intake passage 18 is connected to the intake port of each cylinder, and the exhaust passage 20 is connected to the exhaust port of each cylinder.
- the intake passage 18 is provided with an electronically controlled throttle valve 22 that adjusts the intake air amount based on the accelerator opening and the like.
- the exhaust passage 20 is provided with a corona discharge type exhaust purification device 24 that purifies particulate matter (PM) in the exhaust gas.
- PM particulate matter
- Each cylinder has an in-cylinder injection valve 26 for injecting fuel into the combustion chamber 14 (in-cylinder), an ignition plug 28 for igniting an air-fuel mixture in the cylinder, and an intake valve 30 for opening and closing the intake port. And an exhaust valve 32 for opening and closing the exhaust port.
- the system of the present embodiment includes a sensor system including a crank angle sensor 34, an air flow sensor 36, a water temperature sensor 38, an exhaust temperature sensor 40, an air-fuel ratio sensor 42, and the like, and an ECU (Electronic that controls the operating state of the engine 10). Control Unit) 50.
- the crank angle sensor 34 outputs a signal synchronized with the rotation of the crankshaft 16, and the air flow sensor 36 detects the intake air amount.
- the water temperature sensor 38 detects the temperature of engine cooling water (engine water temperature) as the engine temperature of the engine 10, and the exhaust temperature sensor 40 detects the exhaust temperature.
- the air-fuel ratio sensor 42 detects an exhaust air-fuel ratio (hereinafter simply referred to as an air-fuel ratio) on the upstream side of the exhaust purification device 24, and constitutes the air-fuel ratio detection means of the present embodiment.
- the sensor system includes various sensors (for example, an accelerator opening sensor that detects an accelerator opening) necessary for controlling the engine 10 and a vehicle on which the engine 10 is mounted. These sensors are connected to the input side of the ECU 50. Various actuators including the throttle valve 22, the exhaust purification device 24, the in-cylinder injection valve 26, the spark plug 28, and the like are connected to the output side of the ECU 50.
- the ECU50 drives each actuator and performs driving
- load factor load factor
- the ECU 50 controls the power supply state to the exhaust purification device 24 based on the air-fuel ratio or the like. Therefore, the ECU 50 applies an applied voltage control circuit 50A that controls the applied voltage V applied between the electrodes 62 and 64 of the exhaust purification device 24, and a discharge current detection circuit 50B that detects the discharge current I flowing between the electrodes 62 and 64. And has.
- FIG. 2 is a cross-sectional view showing a corona discharge type exhaust purification device.
- the exhaust gas purification device 24 purifies PM (nanomicron class fine particles) in exhaust gas using corona discharge, and is substantially the same as the exhaust gas purification device described in, for example, Japanese Unexamined Patent Publication No. 2009-243419. It has a configuration. That is, as shown in FIG. 2, the exhaust purification device 24 includes a cylindrical housing 60 constituting a part of the exhaust passage 20, a center electrode 62 disposed at a central position in the housing 60, And a cylindrical ground electrode 64 provided on the circumferential side.
- the center electrode 62 is supported by a thin cylindrical insulator 66 that penetrates the peripheral wall of the housing 60 and extends in the radial direction, and a rod-shaped electrode support portion 68 that is fitted on the inner peripheral side of the insulator 66. Yes.
- the center electrode 62 is formed in a substantially disc shape, and a plurality of protrusions are provided radially on the peripheral edge thereof. Further, the electrode support portion 68 protrudes in the radial direction from the peripheral wall portion of the housing 60 to the center position, and the tip portion is bent in a substantially L shape, and the center electrode 62 is fixed to the tip portion. .
- the center electrode 62 is connected to the output side of the ECU 50 via the electrode support portion 68 and the like.
- the ground electrode 64 is grounded to the vehicle body or the like while being insulated from the center electrode 62 via the insulator 66.
- the center electrode 62 and the ground electrode 64 are opposed to each other in the radial direction of the housing 60, and a gap of a predetermined dimension is uniformly formed between the electrodes 62 and 64 over the entire circumference. . And these electrodes 62 and 64 comprise the corona discharge part of this Embodiment.
- exhaust gas flows through the housing 60 (ground electrode 64).
- corona discharge is generated around the center electrode 62 in accordance with the voltage applied between the electrodes 62 and 64. Since electrons emitted by corona discharge have high energy, oxygen in the exhaust gas is easily ionized to generate oxygen ions (oxygen radicals) with high chemical activity.
- PM (carbon) in the exhaust gas is oxidized to CO 2 by reacting with this oxygen radical, so that PM can be purified by corona discharge.
- the PM purification rate represents the ratio of the amount of purified PM, for example, based on the amount of PM when the purification process is not performed.
- the inventor of the present application found that there is a correlation between the PM purification rate and the air-fuel ratio, and conducted an experiment for obtaining the correlation between the two. According to this experiment, as shown in FIG. 3, it was confirmed that the PM purification rate decreases as the air-fuel ratio becomes leaner.
- FIG. 3 is a characteristic diagram showing the relationship between the exhaust air-fuel ratio (A / F) and the PM purification rate for each applied voltage.
- a / F exhaust air-fuel ratio
- a plurality of characteristic lines obtained in a state where the applied voltages between the electrodes 62 and 64 are set to different constant values are described.
- the PM purification rate decreases as the air-fuel ratio becomes leaner even when the applied voltage is constant.
- the reason why the PM purification rate decreases on the lean side is estimated as follows. First, when the air-fuel ratio is made lean, the amount of PM generated by combustion in the cylinder decreases, so that the discharge current flowing through the oxidation reaction of PM during corona discharge decreases. As a result, it is considered that the amount of PM oxidized in a chain by the action of the discharge current decreases, and the PM purification rate decreases.
- the power supply state to the electrodes 62 and 64 is controlled based on at least the air-fuel ratio. More specifically, applied voltage control is executed in a region where the air-fuel ratio is richer than stoichiometric (theoretical air-fuel ratio) (hereinafter referred to as a rich region). Further, discharge current control is executed in a region where the air-fuel ratio is leaner than stoichiometric (hereinafter referred to as a lean region). In other words, the present embodiment is characterized in that the control is switched to either applied voltage control or discharge current control based on the air-fuel ratio.
- FIG. 4 is a characteristic diagram showing the relationship between the applied voltage and the exhaust air / fuel ratio realized by the control of the ECU
- FIG. 5 is a characteristic diagram showing the relationship between the discharge current and the exhaust air / fuel ratio.
- the applied voltage control controls the applied voltage V applied between the electrodes 62 and 64 to a target voltage value, and is executed in a rich region.
- the rich region there is a large amount of PM in the exhaust gas, so that the discharge current easily flows through the PM. Since the discharge current and the PM purification rate are substantially proportional to each other, theoretically, the maximum PM purification rate can be obtained by increasing the discharge current by increasing the applied voltage.
- arc discharge that does not contribute to the oxidation of PM is likely to occur as the discharge current easily flows.
- the applied voltage is controlled as high as possible within the voltage range where arc discharge does not occur by executing the applied voltage control.
- the probability of occurrence of arc discharge is determined based on the applied voltage and the air-fuel ratio (when other conditions are constant). Furthermore, arc discharge is more likely to occur as the air-fuel ratio is richer and as the applied voltage is higher. Therefore, in the applied voltage control, as shown in the rich region in FIG. 4, the applied voltage is lowered as the air-fuel ratio becomes richer. The amount of voltage drop at this time is set so that the maximum PM purification rate can be obtained in a range where the probability of occurrence of arc discharge is sufficiently reduced.
- the applied voltage is increased by that amount.
- the discharge current is held at a constant value corresponding to the maximum current value (PM purification rate) in a range where arc discharge does not occur.
- the applied voltage in the rich region, the applied voltage can be reduced by the amount that the air-fuel ratio has become rich, and arc discharge can be prevented.
- the amount of decrease in applied voltage can be minimized according to the air-fuel ratio, and the PM purification rate can be improved.
- the applied voltage control described above is performed based on the air-fuel ratio in a state where parameters other than the air-fuel ratio are not considered (for example, the engine speed, intake air amount, engine water temperature, fuel injection timing, etc. are constant). The case where it controls is illustrated.
- the optimum applied voltage to be applied in the rich region is greatly influenced by the air-fuel ratio even if other parameters fluctuate to some extent. Therefore, in the applied voltage control, even when the applied voltage is set based only on the air-fuel ratio, a sufficient effect can be obtained.
- a specific example of applied voltage control in consideration of other parameters will be described in the second embodiment.
- the discharge current control performs feedback control of the discharge current I flowing between the electrodes 62 and 64 to a target current value, and is executed in a lean region.
- the discharge current is less likely to flow accordingly.
- the discharge current applied energy
- the discharge current control can be easily performed.
- the discharge current control the discharge current that is substantially proportional to the PM purification rate can be controlled, and the PM purification rate can be maximized accurately and easily. For this reason, in this Embodiment, it is set as the structure which performs discharge current control in a lean area
- FIG. 3 there are two regions (hereinafter, referred to as a light lean region and a heavy lean region) in which the sensitivity of the PM purification rate with respect to changes in the air-fuel ratio is different in the lean region.
- the control content is switched between the light lean region and the heavy lean region. More specifically, the sensitivity of the PM purification rate (the slope of the characteristic line shown in FIG. 3) varies greatly across the air-fuel ratio boundary value K1, which is a predetermined air-fuel ratio in the lean region.
- the PM purification rate rapidly decreases as the air-fuel ratio becomes leaner.
- the air-fuel ratio boundary value K1 is, for example, about 15 to 16 with a stoichiometric value of 14.5.
- FIG. 6 is a characteristic diagram showing the relationship between the PM emission amount after the purification treatment by corona discharge and the exhaust air-fuel ratio.
- the solid line in FIG. 6 indicates the PM discharge amount when the applied voltage is constant (when the applied voltage is constant), and the dotted line indicates the PM discharge amount when the applied energy is constant (when the applied voltage is equal).
- the PM emission amount (number of particles) decreases as the air-fuel ratio becomes leaner. This tendency is mainly caused by a decrease in the amount of PM generated on the lean side.
- the PM purification rate rapidly decreases as described above, even though the amount of PM generated has not decreased so much.
- the applied voltage is equal, in the lightly lean region, the PM emission amount increases as the air-fuel ratio becomes leaner, resulting in a phenomenon in which the purification ability decreases.
- the applied voltage is increased and the discharge current is increased as the air-fuel ratio becomes leaner in the light lean region.
- this control by increasing the discharge current in the lightly lean region, it is possible to compensate for the characteristic that the PM purification rate rapidly decreases, and it is possible to reliably apply energy necessary for PM purification. . Therefore, even in the light lean region, it is possible to suppress the PM emission amount after the purification process and realize the purification ability equivalent to that at the time of equal applied energy shown in FIG.
- the amount of PM generated decreases dramatically as the air-fuel ratio becomes leaner.
- the amount of PM discharged in the severe lean region is small even at the same applied voltage, and a sufficient purification capability is ensured. Therefore, in the discharge current control, as shown in FIG. 5, the discharge current is decreased as the air-fuel ratio becomes leaner in the severe lean region. According to this control, in the severe lean region, the amount of PM emission can be reduced with the minimum amount of energy, and the power consumption of the apparatus can be suppressed and PM can be efficiently purified.
- the content of the discharge current control is switched between the light lean region and the heavy lean region.
- the PM emission amount in the lean region basically tends to decrease as the air-fuel ratio becomes leaner. For this reason, even if the characteristic that the peak of the PM emission amount occurs in the light lean region is ignored, the high purification ability can be exhibited as a whole. Therefore, in the present invention, it is not always necessary to switch the content of the discharge current control between the light lean region and the heavy lean region. That is, in the discharge current control, for example, as indicated by a virtual line in FIG. 5, the discharge current may be reduced in the entire lean region as the air-fuel ratio becomes leaner. Even with this configuration, it is possible to reduce power consumption while sufficiently reducing the amount of PM emission.
- the feedback control performed as the discharge current control is to increase or decrease the applied voltage based on the actual current value detected by the discharge current detection circuit 50B, for example, and to match the actual current value with the target current value.
- the actual current value may be acquired by the discharge current detection circuit 50B, but may be configured to be estimated based on the operating state of the engine or the like. A specific method for estimating the discharge current will be described in the second embodiment.
- FIG. 7 is map data for determining the voltage correction coefficient Vk based on the exhaust air / fuel ratio.
- the voltage correction coefficient Vk is multiplied by the applied voltage (reference voltage) Vs at stoichiometry, thereby realizing the characteristics of the applied voltage shown in the rich region in FIG. In the rich region, arc discharge is more likely to occur than stoichiometry. Therefore, in the applied voltage control, the applied voltage is controlled in a voltage range lower than the reference voltage Vs.
- FIG. 8 shows map data for determining the current correction coefficient Ik based on the exhaust air-fuel ratio.
- the current correction coefficient Ik is multiplied by the stoichiometric discharge current (reference current) Is to realize the characteristic of the discharge current shown in the lean region in FIG. The processing using these correction coefficients Vk and Ik will be described with reference to FIG.
- FIG. 9 is a flowchart of the control executed by the ECU in the first embodiment of the present invention.
- the routine shown in this figure is repeatedly executed during operation of the engine.
- engine operation information is acquired based on the output of the sensor system. This operation information includes at least the engine speed, load, engine water temperature, air-fuel ratio, fuel injection timing, exhaust temperature, and the like.
- the reference voltage Vs and the reference current Is at the time of stoichiometry are calculated based on the acquired operation information and the like.
- the reference voltage Vs is defined as an applied voltage that maximizes the PM purification rate in a range where arc discharge does not occur in the stoichiometric state.
- the reference voltage Vs varies according to parameters such as engine speed, intake air amount, air-fuel ratio, engine water temperature, exhaust temperature, fuel injection amount, fuel injection timing, and the like.
- the relationship between these parameters and the reference voltage Vs can be obtained by experiments or the like and converted into map data.
- the ECU 50 stores this map data in advance.
- the ECU 50 can calculate the reference voltage Vs by referring to the map data based on the operation information (the above parameters) acquired in step 102.
- the reference current Is is defined as a discharge current that maximizes the PM purification rate in a range where no arc discharge occurs in the stoichiometric state.
- the ECU 50 can calculate the reference current Is by referring to the map data based on the operation information by a method almost the same as the case of the reference voltage Vs.
- step 104 the current correction coefficient Ik is calculated in step 112 with reference to the map data in FIG. 8 based on the air-fuel ratio.
- step 116 feedback control of the discharge current is executed so that the actual current value matches the discharge current I that is the target current value.
- the applied voltage control and the discharge current control can be appropriately switched according to the air-fuel ratio.
- the state of corona discharge can be appropriately controlled in both the rich region and the lean region, and the PM purification rate can be stably improved while preventing arc discharge.
- steps 104 to 116 in FIG. 9 show a specific example of the power supply control means in claim 1.
- steps 106 to 110 show specific examples of the applied voltage control means in claims 2 and 3
- steps 112 to 116 show specific examples of the discharge current control means in claims 4 and 6.
- the characteristic line shown with a virtual line in FIG. 5 has shown the specific example of the discharge current control means in Claim 5.
- the control is switched between the rich area and the lean area.
- the present invention is characterized in that the air-fuel ratio is used as a parameter for controlling the power supply state to the exhaust emission control device 24, and arbitrary applied voltage control and discharge current control performed based on the air-fuel ratio are performed. Is included. Therefore, the present invention is not limited to the configuration in which control is switched between the rich region and the lean region.
- the PM purification rate or the occurrence probability of arc discharge shows a characteristic tendency. It is good also as a structure which performs the voltage control and electric current control which improve a tendency (or promote).
- the power supply state (applied voltage and discharge current) to the exhaust purification device 24 is appropriately controlled in accordance with the tendency of the PM purification rate in each air-fuel ratio region, the tendency of the occurrence probability of arc discharge, and the like. be able to. Accordingly, it is possible to stably realize the maximum PM purification rate while preventing arc discharge in a wide air-fuel ratio region extending from the rich region to the lean region.
- either applied voltage control or discharge current control is executed according to the air-fuel ratio.
- the present invention is not limited to this.
- the applied voltage control may be executed based on the air-fuel ratio in both the rich region and the lean region.
- discharge current control may be executed based on the air-fuel ratio.
- the applied voltage control or the discharge current control is executed based on the air-fuel ratio only in one of the rich region and the lean region, and the applied voltage or the discharge current is controlled regardless of the air-fuel ratio in the other region. It is good also as a structure to perform.
- the discharge current control is executed when the air-fuel ratio is just stoichiometric in FIG.
- the present invention is not limited to this, and when the air-fuel ratio is stoichiometric, either applied voltage control or discharge current control may be executed.
- Embodiment 2 a second embodiment of the present invention will be described with reference to FIGS.
- the present embodiment is characterized in that applied voltage control is executed in consideration of parameters other than the air-fuel ratio in the configuration and control (FIGS. 1, 9, etc.) substantially the same as in the first embodiment.
- the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the applied voltage control can be executed based on the air-fuel ratio, but the accuracy of the control can be improved by taking other parameters into consideration.
- parameters other than the air-fuel ratio include engine temperature (engine water temperature), fuel injection timing, in-cylinder injection amount, and the like.
- the engine temperature is not limited to the engine water temperature, and the temperature of the lubricating oil may be used.
- the PM amount in the exhaust gas is calculated based on the exhaust air-fuel ratio, the engine water temperature, the fuel injection timing, the in-cylinder injection amount, etc., and the applied voltage is calculated based on the PM amount, etc. To do.
- FIG. 10 is a characteristic diagram showing the relationship between the exhaust air-fuel ratio and the number of PM particles in the exhaust gas in the second embodiment of the present invention.
- the number of PM particles has a characteristic of decreasing as the air-fuel ratio becomes leaner. Note that the number of PM particles corresponds to the concentration (density) of PM in the exhaust gas in a state where the exhaust flow rate is constant.
- FIG. 11 is a characteristic diagram showing the relationship between the fuel injection timing (injection start timing) and the number of PM particles in the exhaust gas.
- injection start timing the more the amount of fuel adhering to the piston or the fuel interfering with the intake valve in the injected fuel, the more easily the amount of PM generated increases.
- the amount of fuel adhering to the piston and intake valve is affected by the position of the piston when the fuel is injected and the lift amount of the intake valve. For this reason, there is a correlation between the number of PM particles and the fuel injection timing.
- the characteristic diagram shown in FIG. 11 can be obtained.
- a characteristic line A indicated by a solid line in FIG. 11 includes a characteristic line B of the number of PM particles caused by the fuel adhering to the piston and a characteristic line C of the number of PM particles caused by the interference between the intake valve and the injected fuel. It is synthesized.
- FIG. 12 is a characteristic diagram showing the relationship between the characteristic line in FIG. 11 and the engine water temperature.
- the characteristic line A changes in a direction in which the number of PM particles increases as the engine water temperature decreases.
- a part caused by fuel adhering to the piston corresponding to the characteristic line B
- a part caused by interference between the intake valve and the injected fuel corresponding to the characteristic line C.
- the portion due to the interference between the intake valve and the injected fuel is greater in sensitivity to changes in the engine water temperature.
- the characteristic lines shown in FIG. 12 also reflect the sensitivity to such temperature changes.
- FIG. 13 is a characteristic diagram showing the relationship between the in-cylinder injection amount and the number of PM particles.
- the ratio of the in-cylinder injection amount increases, so The amount of fuel adhesion increases.
- the number of PM particles tends to increase as the in-cylinder injection amount (or the in-cylinder injection ratio with respect to the total fuel injection amount) increases.
- the ECU 50 stores in advance a plurality of map data created based on the data shown in FIGS.
- the map data includes basic map data for calculating the estimated piston adhesion amount FMp and the estimated IN valve interference amount FMiv based on the fuel injection timing, and water temperature correction coefficients ka1 and kb1 based on the engine water temperature, respectively.
- Water temperature map data for calculating the A / F correction coefficients ka2 and kb2 based on the air-fuel ratio, and the injection ratio correction coefficients ka3 and kb3 based on the in-cylinder injection ratio, respectively.
- injection ratio map data for the purpose.
- the estimated piston adhesion amount FMp corresponds to the amount of PM generated due to the fuel adhering to the piston
- the estimated IN valve interference amount FMiv is the PM of the PM caused by the interference between the intake valve and the injected fuel. This corresponds to the amount generated.
- the correction coefficients ka1, ka2, and ka3 are correction coefficients for correcting the estimated piston adhesion amount FMp based on the water temperature, the air-fuel ratio, and the injection ratio, respectively.
- the correction coefficients kb1, kb2, and kb3 are estimated IN valves, respectively. This is a correction coefficient for correcting the interference amount FMiv based on the water temperature, the air-fuel ratio, and the injection ratio.
- the correction coefficients ka1 to ka3 and kb1 to kb3 are set in the range of 0 to 1, respectively.
- the injection ratio correction coefficients ka3 and kb3 are applied to a dual injection type engine, and are held at 1 in the present embodiment.
- the PM amount calculation process first, the engine water temperature, the fuel injection timing, and the in-cylinder injection ratio are acquired based on the output of the sensor system. Then, by referring to the above map data based on these parameters, the estimated piston adhesion amount FMp, the estimated IN valve interference amount FMiv and the correction coefficients ka1 to ka3, kb1 to kb3 are calculated, respectively, and the following (1 ) To (3) to calculate the PM concentration D (pieces / cm 3 ).
- a n (ka1 ⁇ ka2 ⁇ ka3) ⁇ a n ⁇ 1 (1)
- b n (kb1 ⁇ kb2 ⁇ kb3) ⁇ b n ⁇ 1 (2)
- D a n ⁇ FMp + b n ⁇ FMiv ⁇ (3)
- a n and b n are total correction coefficients reflecting the correction coefficients ka1 to ka3 and kb1 to kb3, respectively.
- the total correction coefficients a n and b n indicate values calculated in the latest calculation cycle, and the total correction coefficients a n ⁇ 1 and b n ⁇ 1 calculated in the previous calculation cycle are used for the calculation. It is done.
- an exhaust flow rate E (cm 3 / sec) is calculated based on the engine speed, the intake air amount, the fuel injection amount, and the like, and based on the exhaust flow rate E and the PM concentration D, the following (4 ) To calculate the PM amount F.
- the PM amount F is calculated as the number of flow rates (pieces / sec).
- the initial values of the overall correction coefficients a n and b n may be 1.
- the number of PM particles in the exhaust gas increases as the engine load increases. Therefore, in the present invention, the relationship between the number of PM particles and the load may be converted into map data, and the PM amount may be corrected based on the load.
- the required applied energy Eb is, for example, a known oxidation energy (activation energy) per unit particle of PM added by the amount of PM in the exhaust gas.
- the ECU 50 stores in advance map data obtained by converting this addition processing into data, that is, map data (energy map data) for calculating the required applied energy Eb based on the PM amount. Further, as shown in FIG. 14, the basic applied voltage Vb needs to be higher as the required applied energy Eb is higher and the PM amount is larger.
- FIG. 14 shows map data for determining the basic applied voltage Vb based on the required applied energy Eb and the PM amount, and this map data is stored in the ECU 50 in advance. When the map data shown in FIG.
- the ECU 50 can calculate the basic applied voltage Vb based on the amount of PM based on the two map data, and can apply the basic applied voltage Vb between the electrodes 62 and 64.
- the basic application of the parameter state including the required applied energy Eb, air-fuel ratio, engine water temperature, fuel injection timing, and in-cylinder injection ratio necessary to oxidize PM in the exhaust gas is performed.
- the basic applied voltage Vb can be appropriately controlled according to each parameter by reflecting it in the voltage Vb. Specifically, as a basic tendency, the basic applied voltage Vb can be lowered as the amount of PM in the exhaust gas increases. More specifically, the basic applied voltage Vb can be lowered as the richness of the air-fuel ratio is larger, the engine water temperature is lower, and the in-cylinder injection ratio is higher. Furthermore, the basic applied voltage Vb can also be reduced when the fuel injection timing is such that the PM amount is likely to increase.
- the applied voltage is appropriately controlled as described above, the actual discharge current flowing between the electrodes 62 and 64 is likely to fluctuate due to factors other than the applied voltage, various losses, and the like.
- the discharge current fluctuates more than expected, the actual applied energy becomes lower than the required applied energy Eb, and the PM purification rate decreases. Further, when the discharge current fluctuates more than expected, arc discharge may occur. Therefore, in the present embodiment, by executing the voltage optimization process and arc discharge prevention process described below, the final applied voltage V is calculated using the basic applied voltage Vb as an initial value, and this applied voltage V is applied between the electrodes 62 and 64.
- a discharge current is estimated by a method described later based on a voltage to be applied (hereinafter referred to as a virtual voltage) or the like.
- the applied energy is estimated based on the estimated discharge current and the virtual voltage, and the virtual voltage is corrected so that the estimated value of the applied energy becomes equal to the required applied energy Eb.
- the estimated value of the applied energy becomes equal to the required applied energy Eb, that is, the virtual voltage when the estimated discharge current satisfies the required applied energy Eb is calculated as an appropriate applied voltage.
- the basic applied voltage Vb is used as an initial value (value before correction) of the virtual voltage.
- the discharge current can be estimated based on the voltage to be applied, and the applied voltage can be adjusted based on the estimated discharge current Ie. That is, the applied voltage can be optimized so that the applied energy becomes equal to the required applied energy Eb. Accordingly, it is possible to prevent insufficient energy applied during corona discharge or to apply more energy than necessary, and it is possible to efficiently purify PM while suppressing power consumption.
- Arc discharge prevention treatment This process limits the applied voltage obtained by the voltage optimization process to a voltage range in which arc discharge does not occur.
- a circular discharge region is formed from the center electrode 62 toward the ground electrode 64, and the discharge radius (discharging distance) Rb is the radius of the ground electrode 64 (distance between the electrodes 62 and 64). )
- the corona discharge can be stably maintained.
- the discharge radius Rb exceeds the radius of the ground electrode 64 (hereinafter referred to as the pipe diameter R)
- the probability of arc discharge tends to increase rapidly. For this reason, in the arc discharge prevention process, first, the discharge radius Rb when the virtual voltage is applied is calculated based on the virtual voltage to be applied and the PM amount.
- FIG. 15 is map data for calculating the discharge radius Rb based on the applied voltage and the PM amount (PM particle number), and this map data is stored in the ECU 50 in advance.
- the discharge radius Rb tends to increase as the applied voltage increases and as the number of PM particles in the exhaust gas increases.
- a specific virtual voltage in which the discharge radius Rb calculated based on the map data in FIG. 15 is equal to the pipe diameter R is calculated as the upper limit value of the applied voltage, and the actual applied voltage is limited by this upper limit value. To do. Specifically, the smaller one of the applied voltage calculated by the voltage optimization process and the upper limit value is calculated as the final applied voltage V.
- the pipe diameter R is previously stored in the ECU 50 as known data.
- the voltage to be applied before applying the actual voltage, the voltage to be applied can be limited to the maximum voltage value within a range where arc discharge does not occur. Therefore, inefficient control for reducing the applied voltage after the occurrence of arc discharge is unnecessary, and the maximum PM purification rate can be obtained while preventing arc discharge in advance.
- the discharge current estimation process used in the voltage optimization process.
- the magnitude of the discharge current is estimated based on the applied voltage (virtual voltage), the PM amount, the exhaust gas temperature, and the air-fuel ratio without actually applying a voltage.
- the basic discharge current Ib that is the initial value of the estimation process is calculated.
- FIG. 16 is map data for calculating the basic discharge current based on the applied voltage and the PM amount, and is stored in advance in the ECU 50. As shown in this figure, the discharge current tends to increase as the applied voltage increases and as the amount of PM in the exhaust gas increases.
- the discharge current that flows when the virtual voltage is applied can be estimated by referring to the map data in FIG. 16 based on the virtual voltage and the PM amount.
- FIGS. 17 and 18 are stored in the ECU 50 in advance.
- FIG. 17 is map data for calculating the exhaust temperature / current correction coefficient ki1 based on the exhaust temperature
- FIG. 18 is map data for calculating the A / F current correction coefficient ki2 based on the exhaust air / fuel ratio. is there.
- These correction coefficients ki1, ki2 are set in the range of 0 to 1, respectively.
- the discharge current tends to increase as the exhaust gas temperature increases even if other conditions are the same. Further, as shown in FIG. 18, the discharge current tends to decrease as the air-fuel ratio becomes leaner.
- the ECU 50 calculates the estimated discharge current Ie as shown in the following equation (5) based on the correction coefficients ki1, ki2 calculated from these map data and the basic discharge current Ib.
- the estimated discharge current Ie reflecting the amount of PM in the exhaust gas, the exhaust temperature, the air-fuel ratio, and the applied voltage can be calculated without applying an actual voltage.
- the actual discharge current can be detected by the discharge current detection circuit 50B of the ECU 50, but in this case, it is necessary to apply a voltage between the electrodes 62 and 64 once. There is also a case where arc discharge occurs due to this voltage application.
- the above estimation process it is possible to easily obtain the optimum value of the applied voltage in consideration of the behavior of the discharge current without erroneously generating arc discharge.
- FIG. 19 is a flowchart of applied voltage control executed by the ECU in the second embodiment of the present invention.
- the routine shown in this figure is executed in place of steps 106 to 110 in the first embodiment (FIG. 9).
- the PM amount in the exhaust gas is calculated by executing a process shown in FIG. 20 described later.
- the above-described applied voltage calculation process is executed. That is, in step 202, the required applied energy Eb is calculated by referring to the energy map data based on the PM amount.
- the basic applied voltage Vb is calculated with reference to the map data of FIG. 14 based on the required applied energy Eb and the PM amount.
- step 206 an estimated discharge current Ie is calculated based on the applied voltage (virtual voltage) and the PM amount by executing a process shown in FIG.
- the processes in steps 206 to 212 are repeatedly executed as a loop process.
- the basic applied voltage Vb calculated in step 204 is used as the initial value of the virtual voltage.
- step 210 it is determined whether or not the calculated value of the applied energy E is equal to the required applied energy Eb.
- step 210 the value of the basic applied voltage Vb is updated (changed) by a predetermined update amount in step 212, and the process returns to step 206.
- step 206 the estimated discharge current Ie is calculated again using the updated basic applied voltage Vb as a virtual voltage.
- the update amount of the basic applied voltage Vb is set so that the applied energy E approaches the required applied energy Eb based on, for example, the magnitude (positive / negative) of the difference (E ⁇ Eb) between the applied energy E and the required applied energy Eb. Is done.
- steps 206 to 212 the loop process is performed while updating the basic applied voltage Vb until the applied energy E becomes equal to the required applied energy Eb.
- step 214 the final update value of the basic applied voltage Vb in the loop process is provisionally applied. Calculated as voltage V1.
- step 216 the provisional applied voltage V1 is substituted into the virtual voltage Vb2 that is a variable for updating.
- the discharge radius Rb is calculated by referring to the map data of FIG. 15 based on the virtual voltage Vb2 and the PM amount.
- step 220 it is determined whether or not the discharge radius Rb is equal to the pipe diameter R. If this determination is not established, the virtual voltage Vb2 is updated (changed) by a predetermined update amount in step 222, and the process returns to step 218.
- step 218 the discharge radius Rb is calculated again based on the updated virtual voltage Vb2 and the PM amount.
- step 218 to 222 the loop process is performed while updating the virtual voltage Vb2 until the discharge radius Rb becomes equal to the pipe diameter R.
- step 220 the determination in step 220 is established and the loop process ends. Therefore, in step 224, the final updated value of the virtual voltage Vb2 in the loop process can be avoided.
- the maximum applied voltage V2 is calculated.
- step 226 it is determined whether or not the applied voltage V1 is greater than the maximum applied voltage V2. If this determination is established, since the probability of occurrence of arc discharge is high if the applied voltage V1 is applied as it is, the maximum applied voltage V2 is calculated as the final applied voltage V in step 228. On the other hand, when the determination in step 226 is not established, arc discharge can be avoided by the applied voltage V1, and therefore, in step 230, the applied voltage V1 is calculated as the final applied voltage V. Since the final applied voltage V is calculated by the above processing, in step 232, the voltage applied between the electrodes 62 and 64 is controlled using the applied voltage V as a target voltage value.
- FIG. 20 is a flowchart showing a PM amount calculation process executed by the ECU. Note that the routine shown in this figure is repeatedly executed while the engine is running.
- engine operation information is acquired based on the output of the sensor system. This operation information includes at least the engine speed, the intake air amount, the load, the engine water temperature, the air-fuel ratio, the exhaust temperature, the fuel injection timing, the in-cylinder injection ratio (in the case of a dual injection engine), and the like.
- the estimated piston adhesion amount FMp is calculated by referring to the basic map data based on the fuel injection timing.
- the estimated IN valve interference amount FMiv is calculated by referring to the basic map data based on the fuel injection timing.
- the water temperature correction coefficients ka1 and kb1 are calculated by referring to the water temperature map data based on the engine water temperature.
- the air / fuel ratio map data is referred to based on the air / fuel ratio.
- a / F correction coefficients ka2 and kb2 are calculated.
- the injection ratio correction coefficients ka3 and kb3 are calculated with reference to the injection ratio map data based on the in-cylinder injection ratio.
- step 312 the total correction coefficients a n and b n are calculated from the equations (1) and (2), and in step 314, the PM concentration (PM particle number) D is calculated from the equation (3).
- step 316 the exhaust gas flow rate E is calculated based on the engine speed, the intake air amount, the fuel injection amount, and the like, and the PM amount F is calculated using the equation (4).
- FIG. 21 is a flowchart showing a discharge current estimation process executed by the ECU. Note that the routine shown in this figure is repeatedly executed while the engine is running.
- the routine shown in FIG. 21 first, in step 400, the basic discharge current Ib is calculated with reference to the map data of FIG. 16 based on the applied voltage (virtual voltage) and the PM amount.
- the exhaust gas temperature correction coefficient ki1 is calculated with reference to the map data of FIG. 17 based on the exhaust gas temperature.
- the A / F current correction coefficient ki2 is calculated with reference to the map data of FIG. 18 based on the air-fuel ratio.
- the estimated discharge current Ie is calculated by the equation (5).
- steps 200 to 232 in FIG. 19 show specific examples of applied voltage control means in claims 2, 3, 7, and 8.
- steps 300 to 316 in FIG. 20 show a specific example of the PM amount calculation means in claims 7 and 10
- steps 400 to 406 in FIG. 21 show a specific example of the discharge current estimation means in claim 8.
- steps 216 to 230 in FIG. 19 show a specific example of the arc discharge preventing means in claims 9 and 10
- step 218 shows a specific example of the discharge distance calculating means in claim 10.
- the basic application voltage Vb is calculated by the application voltage calculation process, and then the final application is performed with the basic application voltage Vb as an initial value by the voltage optimization process and the arc discharge prevention process.
- the voltage V was calculated, and the applied voltage V was applied between the electrodes 62 and 64.
- the present invention is not limited to this.
- only the applied voltage calculation process may be executed, and the basic applied voltage Vb may be applied as it is between the electrodes 62 and 64.
- the effects of the individual processes can be exhibited.
- the arc discharge prevention process described in the second embodiment may be performed.
- the applied voltage V calculated in step 108 in FIG. 9 may be substituted into the virtual voltage Vb2 in step 216 in FIG. 19, and the arc discharge prevention process in steps 216 to 230 may be executed.
- the effect of the arc discharge prevention process can be added to the applied voltage control of the first embodiment.
- the applied voltage is reduced as the amount of PM in the exhaust gas increases in the applied voltage calculation process.
- the present invention is characterized by using the PM amount in the exhaust gas as a parameter for controlling the applied voltage, and includes any applied voltage control performed based on the PM amount. Therefore, the present invention is not limited to the configuration in which the applied voltage is decreased as the PM amount is increased. If necessary, the applied voltage may be increased as the PM amount is increased. Moreover, it is good also as a structure which reduces or raises an applied voltage only when PM amount becomes a specific range.
- Embodiment 3 of the present invention will be described with reference to FIG.
- the present embodiment is characterized in that, in the second embodiment, an actual discharge current is detected during corona discharge, and the applied voltage is corrected based on the difference between the actual discharge current and the estimated discharge current.
- the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- an actual discharge current (actual discharge current) Ir is detected during corona discharge. Further, the estimated discharge current Ie is calculated by the above-described discharge current estimation process based on the maximum applied voltage V2 (see FIG. 19) in the voltage range that does not cause arc discharge and the amount of PM in the exhaust gas.
- the correction amount f (Ir-Ie) of the applied voltage is calculated based on the difference (Ir-Ie) between these current values, and the correction amount f The applied voltage V is corrected based on (Ir-Ie).
- the correction amount f (Ir ⁇ Ie) is a correction coefficient for decreasing the applied voltage.
- the correction amount f (Ir ⁇ Ie) is set in advance as a function that decreases in the range of 0 to 1 as the current value difference (Ir ⁇ Ie) increases.
- the applied voltage V is corrected as shown in the following equation (6) based on the correction amount f (Ir ⁇ Ie).
- FIG. 22 is a flowchart showing applied voltage correction control executed by the ECU in the third embodiment of the present invention.
- the routine shown in this figure is repeatedly executed during engine operation in parallel with the applied voltage control described in the second embodiment.
- the routine shown in FIG. 22 first, in step 500, the actual discharge current Ir during corona discharge is detected by the discharge current detection circuit 50B of the ECU 50.
- the estimated discharge current Ie is calculated based on the maximum applied voltage V2 calculated by the arc discharge prevention process and the PM amount calculated by the PM amount calculation process.
- step 504 it is determined whether or not the actual discharge current Ir is larger than the estimated discharge current Ie. If this determination is established, in step 506, a correction amount f (Ir-Ie) is calculated, and the applied voltage V is corrected by the equation (6). In step 508, the applied voltage V is updated to the corrected value.
- the applied voltage V can be reduced by the calculated correction amount f (Ir ⁇ Ie). Thereby, the error included in the estimated discharge current Ie can be fed back to the applied voltage V, and the applied voltage V can be corrected to a more appropriate value.
Abstract
Description
排気空燃比を検出する空燃比検出手段と、
前記排気浄化装置のコロナ放電部に給電する手段であって、当該コロナ放電部への給電状態を前記排気空燃比に基いて制御する給電制御手段と、
を備えることを特徴とする。
前記印加電圧制御手段は、前記PM量に基いて前記印加電圧を算出する構成としている。
前記印加電圧制御手段は、前記放電電流の推定値が粒子状物質の浄化に必要な要求値を満たすときの仮想電圧を実際の印加電圧として算出する構成としている。
前記コロナ電極部を構成する2つの電極間に仮想電圧を印加した場合に一方の電極から他方の電極に向けて生じる放電の到達距離を、少なくとも前記仮想電圧と前記PM量とに基いて算出する放電距離算出手段と、を備え、
前記アーク放電防止手段は、前記放電の到達距離が前記各電極の電極間距離と等しくなるときの仮想電圧に基いて前記印加電圧を制限する構成としている。
[実施の形態1の構成]
以下、図1乃至図9を参照して、本発明の実施の形態1について説明する。図1は、本発明の実施の形態1のシステム構成を説明するための全体構成図である。本実施の形態のシステムは、内燃機関として直噴型のエンジン10を備えている。エンジン10の各気筒には、ピストン12により燃焼室14が画成されており、ピストン12は、エンジン10の出力軸であるクランク軸16に連結されている。また、エンジン10は、各気筒に吸入空気を吸込む吸気通路18と、各気筒から排気ガスが排出される排気通路20とを備えている。吸気通路18は各気筒の吸気ポートに接続されており、排気通路20は各気筒の排気ポートに接続されている。
排気浄化装置24の作動時には、電極62,64間に印加する印加電圧や、電極62,64間に流れる放電電流を適切に制御し、高いPM浄化率を維持するのが好ましい。ここで、PM浄化率とは、例えば浄化処理を行わない場合のPMの量を基準として、浄化されたPMの量の割合を表すものである。本願発明者は、PM浄化率と空燃比との間に相関があることを見出し、両者の相関を求めるための実験を行った。この実験によれば、図3に示すように、空燃比がリーン化するほど、PM浄化率が低下する現象が確認された。
印加電圧制御は、電極62,64間に印加する印加電圧Vを目標電圧値に制御するもので、リッチ領域で実行される。リッチ領域では、排気ガス中のPMが多いので、PMを媒介として放電電流が流れ易い。放電電流とPM浄化率とはほぼ比例関係にあるので、理論的には、印加電圧を高くして放電電流を増加させれば、最大のPM浄化率を得ることができる。しかし、リッチ領域では、放電電流が流れ易い分だけ、PMの酸化に寄与しないアーク放電が発生し易い。即ち、印加電圧や放電電流を不用意に増加させると、コロナ放電によるPM浄化率が最大となる前にアーク放電が生じ、PM浄化率が殆ど零となる可能性が高い。しかも、放電電流は、例えば排気ガス中のPM量、排気温度等によっても変動するので、アーク放電を回避しつつ放電電流を正確に制御するのは難しい。
放電電流制御は、電極62,64間に流れる放電電流Iを目標電流値にフィードバック制御するもので、リーン領域で実行される。リーン領域では、排気ガス中のPMが減少するので、その分だけ放電電流が流れ難くなる。この結果、印加電圧を一定とした状態でも、放電電流(印加エネルギ)が減少し易い。一方、リーン領域では、印加電圧を高くしてもアーク放電が発生し難いので、放電電流制御を容易に行うことができる。そして、放電電流制御によれば、PM浄化率とほぼ比例関係にある放電電流を制御し、PM浄化率を正確かつ容易に最大化することができる。このため、本実施の形態では、リーン領域において放電電流制御を行う構成としている。
次に、図9を参照して、上述した制御を実現するための具体的な処理について説明する。図9は、本発明の実施の形態1において、ECUにより実行される制御のフローチャートである。この図に示すルーチンは、エンジンの運転中に繰返し実行される。図9に示すルーチンでは、まず、ステップ100において、センサ系統の出力に基いてエンジンの運転情報を取得する。この運転情報には、少なくともエンジン回転数、負荷、エンジン水温、空燃比、燃料噴射時期、排気温度等が含まれる。
次に、図10乃至図21を参照して、本発明の実施の形態2について説明する。本実施の形態は、実施の形態1とほぼ同様の構成及び制御(図1、図9等)において、空燃比以外のパラメータも考慮して印加電圧制御を実行することを特徴としている。なお、本実施の形態では、前記実施の形態1と同一の構成要素に同一の符号を付し、その説明を省略するものとする。
前述したように、印加電圧制御は、空燃比に基いて実行することができるが、他のパラメータも考慮することにより、制御の精度を向上させることができる。ここで、空燃比以外のパラメータを例示すると、機関温度(エンジン水温)、燃料噴射時期、筒内噴射量等である。なお、機関温度としては、エンジン水温に限らず、潤滑油の温度等を用いてもよい。上記各パラメータが変化すると、排気ガス中のPM量(PMの発生量)が変化し、これに伴ってPM浄化率を最大とする最適な印加電圧が変化する。このため、本実施の形態では、まず、排気空燃比、エンジン水温、燃料噴射時期、筒内噴射量等に基いて排気ガス中のPM量を算出し、PM量等に基いて印加電圧を算出する。
まず、図10乃至図13を参照して、上記各パラメータとPM量との関係について説明する。図10は、本発明の実施の形態2において、排気空燃比と排気ガス中のPM粒子数との関係を示す特性線図である。空燃比がリーン化すると、その分だけ燃焼に寄与する燃料が減少するので、PMの発生量も低下する。このため、PM粒子数は、図10に示すように、空燃比がリーン化するほど減少する特性がある。なお、PM粒子数とは、排気流量を一定とした状態での排気ガス中のPMの濃度(密度)に相当している。
bn=(kb1×kb2×kb3)×bn-1 ・・・(2)
D=an×FMp+bn×FMiv ・・・(3)
次に、PM量に基いて印加電圧を算出する処理について説明する。この算出処理は、アーク放電が発生しない範囲で必要最大限の電圧を印加することを目的としている。このため、印加電圧の算出処理では、まず、排気ガス中のPM量に基いて、PMの全量を酸化するのに必要な理論上のエネルギ(要求印加エネルギ)Ebを算出し、この要求印加エネルギを排気ガス中に印加するために必要な印加電圧(基本印加電圧)Vbを算出する。
この処理では、実際の電圧を印加する前に、まず、印加しようとする電圧(以下、仮想電圧と称す)等に基いて、後述の方法により放電電流を推定する。次に、推定放電電流と仮想電圧とに基いて印加エネルギを推定し、この印加エネルギの推定値が要求印加エネルギEbと等しくなるように仮想電圧を補正する。そして、印加エネルギの推定値が要求印加エネルギEbと等しくなるとき、即ち、推定放電電流が要求印加エネルギEbを満たすときの仮想電圧を、適切な印加電圧として算出する。この処理において、基本印加電圧Vbは、仮想電圧の初期値(補正前の値)として用いられる。
この処理は、電圧最適化処理により得られた印加電圧を、アーク放電が発生しない電圧範囲に制限するものである。コロナ放電時には、中心電極62から接地電極64に向けて円形状の放電領域が形成されるが、その放電半径(放電の到達距離)Rbが接地電極64の半径(電極62,64の電極間距離)以内であれば、コロナ放電を安定的に持続させることができる。これに対し、放電半径Rbが接地電極64の半径(以下、配管径Rと称す)を超えた場合には、アーク放電の発生確率が急増する傾向がある。このため、アーク放電防止処理では、まず、印加しようとする仮想電圧とPM量とに基いて、当該仮想電圧を印加した場合の放電半径Rbを算出する。
次に、電圧最適化処理で用いられる放電電流の推定処理について説明する。この推定処理は、実際に電圧を印加せずに、印加電圧(仮想電圧)、PM量、排気温度及び空燃比に基いて放電電流の大きさを推定するものである。具体的には、まず、図16に示すマップデータに基いて、推定処理の初期値となる基本放電電流Ibを算出する。図16は、印加電圧とPM量とに基いて基本放電電流を算出するためのマップデータであり、ECU50に予め記憶されている。この図に示すように、放電電流は、印加電圧が高いほど、また、排気ガス中のPM量が多いほど増加する傾向がある。前述した電圧最適化処理では、仮想電圧とPM量とに基いて図16のマップデータを参照することにより、当該仮想電圧を印加した場合に流れる放電電流を推定することができる。
次に、図19乃至図21を参照して、上述した制御を実現するための具体的な処理について説明する。まず、図19は、本発明の実施の形態2において、ECUにより実行される印加電圧制御のフローチャートである。この図に示すルーチンは、実施の形態1(図9)のステップ106~110に代えて実行される。図19に示すルーチンでは、まず、ステップ200において、後述の図20に示す処理を実行することにより、排気ガス中のPM量を算出する。そして、ステップ202,204では、前述した印加電圧の算出処理を実行する。即ち、ステップ202では、PM量に基いて前記エネルギマップデータを参照し、要求印加エネルギEbを算出する。また、ステップ204では、要求印加エネルギEbとPM量とに基いて図14のマップデータを参照し、基本印加電圧Vbを算出する。
次に、図22を参照して、本発明の実施の形態3について説明する。本実施の形態は、前記実施の形態2において、コロナ放電中に実際の放電電流を検出し、実際の放電電流と推定放電電流との差分に基いて印加電圧を補正することを特徴としている。なお、本実施の形態では、前記実施の形態1と同一の構成要素に同一の符号を付し、その説明を省略するものとする。
本実施の形態では、コロナ放電中に実際の放電電流(実放電電流)Irを検出する。また、アーク放電を発生させない電圧範囲での最大印加電圧V2(前記図19参照)と、排気ガス中のPM量とに基いて、前述の放電電流推定処理により推定放電電流Ieを算出する。そして、実放電電流Irが推定放電電流Ieよりも大きい場合には、これらの電流値の差分(Ir-Ie)に基いて印加電圧の補正量f(Ir-Ie)を算出し、補正量f(Ir-Ie)に基いて印加電圧Vを補正する。
次に、図22を参照して、上述した制御を実現するための具体的な処理について説明する。図22は、本発明の実施の形態3において、ECUにより実行される印加電圧補正制御を示すフローチャートである。この図に示すルーチンは、実施の形態2で説明した印加電圧制御と並行して、エンジンの運転中に繰返し実行されるものとする。図22に示すルーチンでは、まず、ステップ500において、ECU50の放電電流検出回路50Bによりコロナ放電中の実放電電流Irを検出する。また、ステップ502では、前述のアーク放電防止処理により算出された最大印加電圧V2と、PM量の算出処理により算出されたPM量とに基いて、推定放電電流Ieを算出する。そして、ステップ504では、実放電電流Irが推定放電電流Ieよりも大きいか否かを判定する。この判定が成立した場合には、ステップ506において、補正量f(Ir-Ie)を算出し、前記(6)式により印加電圧Vを補正する。そして、ステップ508では、印加電圧Vを補正後の値に更新する。
12 ピストン
14 燃焼室
16 クランク軸
18 吸気通路
20 排気通路
22 スロットルバルブ
24 排気浄化装置
26 筒内噴射弁
28 点火プラグ
30 吸気バルブ
32 排気バルブ
34 クランク角センサ
36 エアフローセンサ
38 水温センサ
40 排気温センサ
42 空燃比センサ(空燃比検出手段)
50 ECU
50A 印加電圧制御回路
50B 放電電流検出回路
60 ハウジング
62,64 電極(コロナ放電部)
66 絶縁碍子
68 電極支持部
K1 空燃比境界値
Claims (10)
- 内燃機関の排気通路内でコロナ放電を発生するコロナ放電部を有し、排気ガス中の粒子状物質をコロナ放電により浄化する排気浄化装置と、
排気空燃比を検出する空燃比検出手段と、
前記排気浄化装置のコロナ放電部に給電する手段であって、当該コロナ放電部への給電状態を前記排気空燃比に基いて制御する給電制御手段と、
を備えることを特徴とする内燃機関の制御装置。 - 前記給電制御手段は、前記排気空燃比が理論空燃比よりもリッチ側となるリッチ領域において、前記コロナ放電部に印加する印加電圧を制御する印加電圧制御手段を備えてなる請求項1に記載の内燃機関の制御装置。
- 前記印加電圧制御手段は、前記排気空燃比が前記リッチ領域内でリッチ化するほど、前記印加電圧を低下させる構成としてなる請求項2に記載の内燃機関の制御装置。
- 前記給電制御手段は、前記排気空燃比が理論空燃比よりもリーン側となるリーン領域において、前記コロナ放電部に流れる放電電流を制御する放電電流制御手段を備えてなる請求項1乃至3のうち何れか1項に記載の内燃機関の制御装置。
- 前記放電電流制御手段は、前記排気空燃比が前記リーン領域内でリーン化するほど、前記放電電流を減少させる構成としてなる請求項4に記載の内燃機関の制御装置。
- 前記放電電流制御手段は、前記リーン領域内の所定の空燃比である空燃比境界値を有し、前記排気空燃比が理論空燃比と前記空燃比境界値との間である場合には、前記排気空燃比がリーン化するほど前記放電電流を増加させ、前記排気空燃比が前記空燃比境界値よりもリーン側である場合には、前記排気空燃比がリーン化するほど前記放電電流を減少させる構成としてなる請求項4に記載の内燃機関の制御装置。
- 排気ガス中に含まれる粒子状物質の量であるPM量を、少なくとも排気空燃比、機関温度及び燃料噴射時期に基いて算出するPM量算出手段を備え、
前記印加電圧制御手段は、前記PM量に基いて前記印加電圧を算出する構成としてなる請求項2または3に記載の内燃機関の制御装置。 - 前記コロナ放電部に仮想電圧を印加した場合に流れる放電電流を、少なくとも当該仮想電圧と前記PM量とに基いて推定する放電電流推定手段を備え、
前記印加電圧制御手段は、前記放電電流の推定値が粒子状物質の浄化に必要な要求値を満たすときの仮想電圧を実際の印加電圧として算出する構成としてなる請求項7に記載の内燃機関の制御装置。 - 前記コロナ放電部に印加する印加電圧をアーク放電が発生しない電圧範囲に制限するアーク放電防止手段を備えてなる請求項1乃至8のうち何れか1項に記載の内燃機関の制御装置。
- 排気ガス中に含まれる粒子状物質の量であるPM量を、少なくとも排気空燃比、機関温度及び燃料噴射時期に基いて算出するPM量算出手段と、
前記コロナ電極部を構成する2つの電極間に仮想電圧を印加した場合に一方の電極から他方の電極に向けて生じる放電の到達距離を、少なくとも前記仮想電圧と前記PM量とに基いて算出する放電距離算出手段と、を備え、
前記アーク放電防止手段は、前記放電の到達距離が前記各電極の電極間距離と等しくなるときの仮想電圧に基いて前記印加電圧を制限する構成としてなる請求項9に記載の内燃機関の制御装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10852132.9A EP2578822A4 (en) | 2010-05-25 | 2010-05-25 | CONTROL DEVICE FOR A COMBUSTION ENGINE |
CN201080067013.0A CN102906380B (zh) | 2010-05-25 | 2010-05-25 | 内燃机的控制装置 |
JP2012517014A JP5382214B2 (ja) | 2010-05-25 | 2010-05-25 | 内燃機関の制御装置 |
US13/699,693 US9057297B2 (en) | 2010-05-25 | 2010-05-25 | Control apparatus for internal combustion engine |
PCT/JP2010/058816 WO2011148461A1 (ja) | 2010-05-25 | 2010-05-25 | 内燃機関の制御装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2010/058816 WO2011148461A1 (ja) | 2010-05-25 | 2010-05-25 | 内燃機関の制御装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011148461A1 true WO2011148461A1 (ja) | 2011-12-01 |
Family
ID=45003470
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/058816 WO2011148461A1 (ja) | 2010-05-25 | 2010-05-25 | 内燃機関の制御装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US9057297B2 (ja) |
EP (1) | EP2578822A4 (ja) |
JP (1) | JP5382214B2 (ja) |
CN (1) | CN102906380B (ja) |
WO (1) | WO2011148461A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013245659A (ja) * | 2012-05-29 | 2013-12-09 | Toyota Motor Corp | 粒子状物質処理装置 |
US20140000243A1 (en) * | 2011-03-16 | 2014-01-02 | Toyota Jidosha Kabushiki Kaisha | Particulate matter processing apparatus |
US9309796B2 (en) | 2011-03-16 | 2016-04-12 | Toyota Jidosha Kabushiki Kaisha | Particulate matter processing apparatus |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013112039B4 (de) * | 2013-10-31 | 2015-05-07 | Borgwarner Ludwigsburg Gmbh | Korona-Zündsystem für einen Verbrennungsmotor und Verfahren zur Steuerung eines Korona-Zündsystems |
KR101734760B1 (ko) * | 2016-04-18 | 2017-05-11 | 현대자동차주식회사 | 연료전지 스택의 제어 장치 및 그 방법 |
JP2018062199A (ja) * | 2016-10-11 | 2018-04-19 | トヨタ自動車株式会社 | ハイブリッド自動車 |
JP6838835B2 (ja) * | 2016-11-18 | 2021-03-03 | 日本特殊陶業株式会社 | 微粒子検知システム |
FR3092365B1 (fr) * | 2019-02-01 | 2022-08-05 | Faurecia Systemes Dechappement | Volume, dispositif, ligne d’échappement et véhicule, procédé de pilotage du volume |
KR102197144B1 (ko) * | 2019-03-29 | 2021-01-05 | 유한회사 더프라임솔루션 | 아킹현상을 방지하는 저온 플라즈마 배출가스 입자상 물질 저감 장치 |
JP7276060B2 (ja) * | 2019-10-09 | 2023-05-18 | トヨタ自動車株式会社 | Co2回収装置を制御する制御装置 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07247827A (ja) * | 1994-03-14 | 1995-09-26 | Isuzu Motors Ltd | 内燃機関の排ガス浄化装置 |
JP2001159309A (ja) * | 1999-12-02 | 2001-06-12 | Toyota Central Res & Dev Lab Inc | 排気ガス浄化装置 |
JP2002266626A (ja) * | 2001-03-08 | 2002-09-18 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP2006029132A (ja) * | 2004-07-13 | 2006-02-02 | Toyota Motor Corp | 排気浄化装置 |
JP2007051608A (ja) * | 2005-08-19 | 2007-03-01 | Isuzu Motors Ltd | 排気ガス処理方法及び排気ガス処理装置 |
JP2009243419A (ja) | 2008-03-31 | 2009-10-22 | Denso Corp | 内燃機関の排気浄化装置 |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3974412A (en) * | 1975-02-03 | 1976-08-10 | Massachusetts Institute Of Technology | Spark plug employing both corona discharge and arc discharge and a system employing the same |
US5061462A (en) * | 1987-11-12 | 1991-10-29 | Nagatoshi Suzuki | Apparatus for producing a streamer corona |
US6038853A (en) * | 1996-08-19 | 2000-03-21 | The Regents Of The University Of California | Plasma-assisted catalytic storage reduction system |
US5711147A (en) * | 1996-08-19 | 1998-01-27 | The Regents Of The University Of California | Plasma-assisted catalytic reduction system |
US6047543A (en) * | 1996-12-18 | 2000-04-11 | Litex, Inc. | Method and apparatus for enhancing the rate and efficiency of gas phase reactions |
US6029442A (en) * | 1996-12-18 | 2000-02-29 | Litex, Inc. | Method and apparatus for using free radicals to reduce pollutants in the exhaust gases from the combustion of fuel |
US6321531B1 (en) * | 1996-12-18 | 2001-11-27 | Litex, Inc. | Method and apparatus for using free radicals to reduce pollutants in the exhaust gases from the combustion of a fuel |
DE69800838T2 (de) * | 1997-09-09 | 2002-03-28 | Accentus Plc Didcot | Behandlung von abgasen |
US6221136B1 (en) * | 1998-11-25 | 2001-04-24 | Msp Corporation | Compact electrostatic precipitator for droplet aerosol collection |
US7469662B2 (en) * | 1999-03-23 | 2008-12-30 | Thomas Engine Company, Llc | Homogeneous charge compression ignition engine with combustion phasing |
CZ20023355A3 (cs) * | 2000-04-11 | 2003-06-18 | Accentus Plc | Katalytický materiál a způsob jeho výroby a způsob a reaktor pro zpracování výfukových plynů |
GB2366747B (en) * | 2000-09-14 | 2004-06-30 | Aea Technology Plc | The plasma assisted catalytic treatment of gases |
US6883507B2 (en) * | 2003-01-06 | 2005-04-26 | Etatech, Inc. | System and method for generating and sustaining a corona electric discharge for igniting a combustible gaseous mixture |
US6763811B1 (en) * | 2003-01-10 | 2004-07-20 | Ronnell Company, Inc. | Method and apparatus to enhance combustion of a fuel |
US6994076B2 (en) * | 2004-04-08 | 2006-02-07 | Fleetguard, Inc. | Electrostatic droplet collector with replaceable electrode |
US7082897B2 (en) * | 2004-04-08 | 2006-08-01 | Fleetguard, Inc. | Electrostatic precipitator with pulsed high voltage power supply |
JP4396477B2 (ja) | 2004-10-18 | 2010-01-13 | 株式会社デンソー | 排気浄化装置 |
JP2006132483A (ja) * | 2004-11-08 | 2006-05-25 | Kri Inc | 排気浄化装置及び排気浄化方法並びに制御方法 |
DE602006014805D1 (de) * | 2005-03-18 | 2010-07-22 | Toyota Motor Co Ltd | Brennkraftmotorsteuervorrichtung und abgasreinigungsverfahren |
JP4419907B2 (ja) * | 2005-05-02 | 2010-02-24 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP3897798B2 (ja) * | 2005-06-08 | 2007-03-28 | 日新電機株式会社 | 排ガス浄化方法及び排ガス浄化装置 |
CN101542080A (zh) * | 2006-11-20 | 2009-09-23 | 株式会社东芝 | 气体净化装置、气体净化系统以及气体净化方法 |
JP4758391B2 (ja) * | 2007-05-09 | 2011-08-24 | トヨタ自動車株式会社 | 排ガス浄化用触媒の再生装置及び再生方法 |
JP2009030567A (ja) * | 2007-07-30 | 2009-02-12 | Nissan Motor Co Ltd | 内燃機関の排気浄化装置 |
US20100078000A1 (en) * | 2008-09-30 | 2010-04-01 | Denso Corporation | Air-fuel ratio control device of internal combustion engine |
-
2010
- 2010-05-25 WO PCT/JP2010/058816 patent/WO2011148461A1/ja active Application Filing
- 2010-05-25 JP JP2012517014A patent/JP5382214B2/ja not_active Expired - Fee Related
- 2010-05-25 EP EP10852132.9A patent/EP2578822A4/en not_active Withdrawn
- 2010-05-25 CN CN201080067013.0A patent/CN102906380B/zh not_active Expired - Fee Related
- 2010-05-25 US US13/699,693 patent/US9057297B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07247827A (ja) * | 1994-03-14 | 1995-09-26 | Isuzu Motors Ltd | 内燃機関の排ガス浄化装置 |
JP2001159309A (ja) * | 1999-12-02 | 2001-06-12 | Toyota Central Res & Dev Lab Inc | 排気ガス浄化装置 |
JP2002266626A (ja) * | 2001-03-08 | 2002-09-18 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP2006029132A (ja) * | 2004-07-13 | 2006-02-02 | Toyota Motor Corp | 排気浄化装置 |
JP2007051608A (ja) * | 2005-08-19 | 2007-03-01 | Isuzu Motors Ltd | 排気ガス処理方法及び排気ガス処理装置 |
JP2009243419A (ja) | 2008-03-31 | 2009-10-22 | Denso Corp | 内燃機関の排気浄化装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2578822A4 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140000243A1 (en) * | 2011-03-16 | 2014-01-02 | Toyota Jidosha Kabushiki Kaisha | Particulate matter processing apparatus |
US9309796B2 (en) | 2011-03-16 | 2016-04-12 | Toyota Jidosha Kabushiki Kaisha | Particulate matter processing apparatus |
JP2013245659A (ja) * | 2012-05-29 | 2013-12-09 | Toyota Motor Corp | 粒子状物質処理装置 |
Also Published As
Publication number | Publication date |
---|---|
EP2578822A1 (en) | 2013-04-10 |
US9057297B2 (en) | 2015-06-16 |
EP2578822A4 (en) | 2016-04-27 |
CN102906380B (zh) | 2015-04-29 |
CN102906380A (zh) | 2013-01-30 |
JP5382214B2 (ja) | 2014-01-08 |
US20130073180A1 (en) | 2013-03-21 |
JPWO2011148461A1 (ja) | 2013-07-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5382214B2 (ja) | 内燃機関の制御装置 | |
JP4989738B2 (ja) | 内燃機関の排気浄化装置 | |
RU2633208C1 (ru) | Контроллер для двигателя внутреннего сгорания | |
JP4832068B2 (ja) | 空燃比制御装置 | |
WO2010134209A1 (ja) | 内燃機関の空燃比制御装置 | |
JP2007247479A (ja) | 圧縮着火式内燃機関の制御装置 | |
JP5817581B2 (ja) | 内燃機関の排出ガス浄化装置 | |
WO2008072635A1 (ja) | 空燃比制御装置 | |
JP2009270932A (ja) | ガスセンサ用ヒータの劣化判定装置 | |
JP5001183B2 (ja) | 内燃機関の空燃比制御装置 | |
WO2011083583A1 (ja) | 内燃機関の点火制御システム | |
WO2013114814A1 (ja) | 内燃機関の排出ガス浄化装置 | |
JP2008025405A (ja) | 内燃機関の制御装置 | |
JP2002155766A (ja) | 内燃機関のバルブタイミング制御装置 | |
US7533662B2 (en) | Apparatus for and method of controlling air-fuel ratio of engine | |
JP2007309167A (ja) | 内燃機関の燃焼室浄化システム | |
JP2008163788A (ja) | マイナスイオン供給制御装置 | |
JP2011226490A (ja) | 内燃機関の空燃比制御装置 | |
JP2008309113A (ja) | 空燃比制御装置 | |
JP2010084670A (ja) | 内燃機関の空燃比制御装置 | |
JP7306338B2 (ja) | 空燃比センサの制御システム | |
JP2011231627A (ja) | 内燃機関の制御装置 | |
US11143128B2 (en) | Exhaust purification system of internal combustion engine | |
JP4494439B2 (ja) | 内燃機関の空燃比制御装置 | |
JP4858493B2 (ja) | 排気浄化触媒の劣化判定装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201080067013.0 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10852132 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012517014 Country of ref document: JP |
|
REEP | Request for entry into the european phase |
Ref document number: 2010852132 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2010852132 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13699693 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |