WO2008065936A1 - Moteur à combustion interne à carburant à l'alcool - Google Patents

Moteur à combustion interne à carburant à l'alcool Download PDF

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Publication number
WO2008065936A1
WO2008065936A1 PCT/JP2007/072496 JP2007072496W WO2008065936A1 WO 2008065936 A1 WO2008065936 A1 WO 2008065936A1 JP 2007072496 W JP2007072496 W JP 2007072496W WO 2008065936 A1 WO2008065936 A1 WO 2008065936A1
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WO
WIPO (PCT)
Prior art keywords
alcohol
fuel
internal combustion
combustion engine
supply amount
Prior art date
Application number
PCT/JP2007/072496
Other languages
English (en)
Japanese (ja)
Inventor
Daisuke Uchida
Original Assignee
Toyota Jidosha Kabushiki Kaisha
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Filing date
Publication date
Application filed by Toyota Jidosha Kabushiki Kaisha filed Critical Toyota Jidosha Kabushiki Kaisha
Publication of WO2008065936A1 publication Critical patent/WO2008065936A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
    • F02D19/0652—Biofuels, e.g. plant oils
    • F02D19/0655—Biofuels, e.g. plant oils at least one fuel being an alcohol, e.g. ethanol
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0673—Valves; Pressure or flow regulators; Mixers
    • F02D19/0676—Multi-way valves; Switch-over valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F02D19/0694—Injectors operating with a plurality of fuels
    • 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
    • F02D2041/0265—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to decrease temperature of the exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • 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
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • the present invention relates to an alcohol fuel internal combustion engine that uses a mixed fuel in which alcohol and fossil fuel are mixed.
  • Patent Documents 2 and 3 disclose techniques related to an alcohol fuel internal combustion engine using such a fuel. The techniques disclosed in Patent Documents 2 and 3 are specifically related to an exhaust gas purification technique in an alcohol fuel internal combustion engine.
  • Alcohol-fueled internal combustion engines also use a catalyst for purification of exhaust gas.
  • the catalyst activates its purifying ability as the temperature rises. If the temperature rises too high, precious metal sintering occurs and the performance deteriorates. The temperature of the catalyst rises as the catalyst receives heat from the exhaust gas. Therefore, in order to prevent the deterioration of the catalyst, such as is necessary force s suppress the temperature of the exhaust gas flowing into the catalyst so that the catalyst from overheating.
  • Patent Document 1 discloses a technique for preventing deterioration of a catalyst due to overheating.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2006-70891
  • Patent Document 2 Japanese Patent Laid-Open No. 2-199214
  • Patent Document 3 Japanese Utility Model Publication No. 3-19420
  • the present invention has been made to solve the above-described problems, and relates to an alcohol-fueled internal combustion engine capable of preventing deterioration of a catalyst by lowering exhaust temperature while suppressing wasteful energy consumption.
  • the first invention includes a catalyst for purifying exhaust gas generated by combustion of the mixed fuel by burning a mixed fuel in which alcohol and fossil fuel are mixed.
  • Alcohol fuel internal combustion engine
  • Supply means for supplying alcohol and fossil fuel in accordance with a predetermined basic mixing ratio; and when the temperature of the catalyst exceeds a predetermined upper limit temperature or when it is predicted that the upper limit temperature is exceeded, the alcohol supply amount is set to Alcohol supply amount correction means for increasing the supply amount determined from
  • the second invention is the same as the first invention
  • the alcohol supply amount correction means predicts the temperature of the catalyst under each supply amount of alcohol and fossil fuel determined from the basic mixing ratio, and the alcohol supply amount increases as the predicted temperature is higher than the upper limit temperature. It is characterized by increasing the amount correction.
  • a third invention is the first or second invention
  • a fourth invention is the third invention, in which
  • the fuel supply means may be configured so that the excess air ratio is constant or substantially constant. It is characterized by supplying alcohol and fossil fuel according to the combined ratio! /.
  • a fifth invention is the invention according to any one of the first to fourth inventions.
  • a sixth invention is the first or second invention
  • the fossil fuel supply amount correction means further reduces the fossil fuel supply amount from the supply amount determined from the basic mixing ratio so that the torque of the internal combustion engine does not change before and after the correction of the alcohol supply amount. It is said.
  • a seventh invention is the invention according to any one of the first to fourth inventions.
  • an eighth invention comprises a catalyst for purifying exhaust gas generated by combustion of the mixed fuel by burning a mixed fuel in which alcohol and fossil fuel are mixed.
  • Alcohol fuel internal combustion engine
  • Fuel supply means for supplying a mixed fuel obtained by mixing alcohol and fossil fuel
  • Alcohol concentration correction means for making the concentration of alcohol in the mixed fuel higher than a predetermined basic alcohol concentration when the temperature of the catalyst exceeds a predetermined upper limit temperature or when it is expected to exceed the upper limit temperature; ,
  • a ninth invention is the eighth invention, wherein
  • the alcohol concentration correction means predicts the temperature of the catalyst under the basic alcohol concentration, and increases the alcohol concentration correction as the predicted temperature is higher than the upper limit temperature. Les.
  • the tenth invention is the eighth or ninth invention, wherein
  • An eleventh aspect of the invention is the tenth aspect of the invention.
  • the fuel supply means supplies the alcohol and the fossil fuel according to the basic mixing ratio so that the excess air ratio is constant or substantially constant.
  • a twelfth invention is any one of the eighth to eleventh inventions.
  • a fuel supply amount correction means for increasing the supply amount of the mixed fuel so that the torque of the internal combustion engine does not change before and after the correction of the alcohol concentration.
  • the fourteenth invention is the invention according to any one of the eighth to eleventh inventions.
  • the supply amount of alcohol is increased in a situation where the catalyst may be deteriorated due to overheating.
  • the combustion chamber can be cooled by the latent heat of vaporization of alcohol.
  • Alcohol contains oxygen in its composition, so it burns quickly. For this reason, the gas temperature in the combustion chamber when the exhaust valve is opened can be relatively lowered. As a result, it is possible to reduce the temperature of the exhaust gas flowing into the catalyst.
  • alcohol has a large latent heat of vaporization per unit weight! /, So compared to increasing the fossil fuel supply amount! /, An increase in amount can provide the same cooling effect. it can.
  • the fossil fuel supply amount is reduced in accordance with the increase in the alcohol supply amount, so that the change in the excess air ratio can be prevented, and the emission due to the change in the excess air ratio can be prevented. It is possible to prevent the catalyst from being deteriorated due to overheating without deteriorating the catalyst.
  • the purification efficiency in the catalyst is maintained by controlling the supply amounts of alcohol and fossil fuel so that the excess air ratio is always kept constant or substantially constant. Touch with force S.
  • the intake air amount is adjusted in accordance with the increase in the alcohol supply amount, whereby the torque change of the internal combustion engine can be prevented, and the drivability deteriorates due to the torque change. It is possible to prevent deterioration of the catalyst due to overheating without incurring.
  • the fossil fuel supply amount is reduced in accordance with the increase in the alcohol supply amount, so that the torque change of the internal combustion engine can be prevented, and the drivability deteriorates due to the torque change. It is possible to prevent deterioration of the catalyst due to overheating without incurring.
  • the ignition timing is adjusted in accordance with the increase in the alcohol supply amount, whereby the torque change of the internal combustion engine can be prevented and the drivability is deteriorated due to the torque change. It is possible to prevent deterioration of the catalyst due to overheating.
  • the concentration of alcohol in the mixed fuel is corrected to increase. Since alcohol has a large latent heat of vaporization per unit weight, the combustion chamber can be cooled by the latent heat of vaporization of alcohol by increasing the concentration of alcohol. Alcohol contains oxygen in its composition, so it burns quickly. For this reason, the gas temperature in the combustion chamber when the exhaust valve is opened can be made relatively low. As a result, it is possible to reduce the temperature of the exhaust gas flowing into the catalyst. Furthermore, since alcohol generates less heat per unit weight than fossil fuel, the energy that is wasted to obtain the same cooling effect is much higher than when the combustion temperature is lowered by increasing the amount of fossil fuel. Less. In other words, according to the tenth invention, energy waste is suppressed while reliably preventing deterioration of the catalyst due to overheating. That's the power S.
  • the higher the risk of catalyst deterioration due to overheating the higher the concentration of alcohol in the mixed fuel, so that deterioration of the catalyst due to overheating can be more reliably prevented.
  • the supply amount of the mixed fuel is increased before and after the correction of the alcohol concentration, whereby the change in the excess air ratio can be prevented, and the change in the excess air ratio can be prevented. It is possible to prevent deterioration of the catalyst due to overheating without causing deterioration of the mission.
  • the purification efficiency in the catalyst is maintained by controlling the supply amounts of alcohol and fossil fuel so that the excess air ratio is always kept constant or substantially constant. That's the power S.
  • the intake air amount is adjusted before and after the correction of the alcohol concentration, whereby the torque change of the internal combustion engine can be prevented and the drivability deteriorates due to the torque change. It is possible to prevent deterioration of the catalyst due to overheating.
  • the amount of the mixed fuel supplied is increased before and after the correction of the alcohol concentration, whereby the torque change of the internal combustion engine can be prevented, and the driveability deteriorates due to the torque change. It is possible to prevent catalyst deterioration due to overheating without incurring
  • the ignition timing is adjusted before and after the correction of the alcohol concentration, whereby a change in the torque of the internal combustion engine can be prevented, and the deterioration of the driver ability due to the change in the torque is not caused. It becomes possible to prevent deterioration of the catalyst due to overheating.
  • FIG. 1 is a schematic diagram of a system of an alcohol fuel internal combustion engine as an embodiment of the present invention.
  • FIG. 2 is a time chart showing the contents of engine control for preventing catalyst overheating performed in the embodiment of the present invention.
  • FIG. 3 is a time chart showing the contents of engine control for making the excess air ratio constant executed in the embodiment of the present invention.
  • FIG. 4 is a time chart showing the contents of engine control for making the torque executed in the embodiment of the present invention constant.
  • FIG. 1 is a schematic view of a system of an alcohol fuel internal combustion engine as an embodiment of the present invention.
  • an intake passage 4 and an exhaust passage 6 are connected to a main body (hereinafter, engine main body) 2 of an alcohol fuel internal combustion engine.
  • a throttle 8 is disposed in the intake passage 4, and a fuel injection valve 12 is attached downstream of the throttle 8.
  • a catalyst 10 for purifying exhaust gas is disposed in the exhaust passage 6.
  • This system is provided with a gasoline tank 14 in which gasoline is stored, and an alcohol mixed fuel tank 16 in which a mixed fuel of alcohol and gasoline (hereinafter, alcohol mixed fuel) is stored.
  • the alcohol-mixed fuel in the alcohol-mixed fuel tank 16 is adjusted to a predetermined alcohol concentration in advance.
  • the gasoline in the gasoline tank 14 is pumped 1 It is sucked up by 8 and supplied to the compounding device 22.
  • the alcohol mixed fuel in the alcohol mixed fuel tank 16 is sucked up by the pump 20 and supplied to the blending device 22.
  • the blending device 22 is a device that adjusts the alcohol concentration of the alcohol mixed fuel (in other words, the mixing ratio of alcohol and gasoline) by mixing gasoline with the alcohol mixed fuel.
  • the alcohol mixed fuel whose alcohol concentration is adjusted by the blender 22 is supplied to the fuel injection valve 12 and injected from the fuel injection valve 12 into the engine body 2.
  • this system is provided with a control device 30 that controls the operation of the system.
  • Various devices such as the fuel injection valve 12, the blending device 22, and the throttle 8 are connected to the output unit of the control device 30.
  • the fuel injection amount can be adjusted by controlling the fuel injection valve 12. It is possible to adjust the alcohol concentration of the alcohol-mixed fuel by controlling the blending device 22.
  • the intake air amount can be adjusted by controlling the throttle 8.
  • Various information relating to the operating state of the engine body 2 such as the accelerator opening, the engine speed, and the intake air temperature is input to the input unit of the control device 30.
  • the control device 30 controls each device according to a predetermined control program based on these various information!
  • the control device 30 As one of the engine controls executed by the control device 30, there is fuel control for preventing the catalyst 10 from overheating. Since the temperature of the catalyst 10 is increased by supplying heat from the exhaust gas to the catalyst 10, it is necessary to suppress the temperature increase of the exhaust gas in order to prevent the catalyst 10 from being overheated. As an effective method, it is effective to cool the combustion chamber using the latent heat of vaporization when the fuel is vaporized. In the engine control, which is the power of this embodiment, alcohol is used instead of gasoline as fuel for cooling the combustion chamber. That is, the alcohol injection amount is increased.
  • alcohol contains oxygen in its composition, it has a higher combustion rate than gasoline. Thereby, the gas temperature in the combustion chamber when the exhaust valve is opened can be relatively lowered, and as a result, the temperature of the exhaust gas flowing into the catalyst 10 can be lowered.
  • alcohol has a large latent heat of vaporization per unit weight. Therefore, compared with the case of increasing the injection amount of gasoline, the same cooling effect can be obtained with a small increase amount.
  • alcohol is more expensive than gasoline Since the amount of heat generated per unit weight is small, the amount of energy that is wasted to obtain the same cooling effect is much smaller than when the amount of gasoline injected is increased.
  • FIG. 2 is a time chart showing the contents of engine control for preventing overheating of the catalyst 10.
  • FIG. 2 shows the relationship between the alcohol concentration of the alcohol mixed fuel adjusted by the blending device 22 and the temperature of the catalyst 10.
  • the alcohol concentration indicated by a broken line in FIG. 2 is a basic value of the alcohol concentration adjusted by the blending device 22. This basic value is determined from comprehensive viewpoints such as fuel consumption rate, torque, and exhaust emission. Usually, the mixing ratio of alcohol and gasoline is adjusted so that the alcohol concentration becomes the basic value.
  • the change in the catalyst temperature indicated by the broken line in FIG. 2 indicates the change in the catalyst temperature when the internal combustion engine is operated with the alcohol concentration maintained at the basic value. If the alcohol concentration is kept at the basic value at all times, the catalyst temperature may rise due to the rise in exhaust temperature during high-speed and high-load operation, and the upper limit temperature may be exceeded.
  • the upper limit temperature is the upper limit of the temperature at which thermal degradation of the catalyst 10 can be avoided if it is less than that, and if the catalyst temperature exceeds the upper limit temperature, the possibility of degradation of the catalyst 10 due to overheating becomes extremely high. End up.
  • the alcohol concentration is set to the basic value. Also set a higher value.
  • the amount of alcohol fuel injected is relatively increased.
  • the combustion chamber can be cooled by the vaporization latent heat of the alcohol to lower the exhaust temperature, and the catalyst temperature is prevented from exceeding the upper limit temperature.
  • the change in catalyst temperature shown by the solid line in Fig. 2 shows the change in catalyst temperature when the alcohol concentration is changed, as shown by the solid line.
  • the control device 30 determines the alcohol concentration from a multidimensional map with the engine load and the engine speed as axes. Whether the catalyst temperature exceeds the upper limit This is because the engine can be operated in the operating range. In the high load range, the exhaust gas temperature increases as the combustion heat increases. In addition, in the high speed range, the amount of heat per unit time that the catalyst 10 receives from the exhaust gas increases as the flow rate of the exhaust gas increases. For this reason, when the internal combustion engine is in a high rotation and high load range, the catalyst temperature is likely to exceed the upper limit temperature. Therefore, the control device 30 sets the alcohol concentration to a value higher than the basic value when the internal combustion engine is operated in a specific operating region on the high rotation and high load side, and sets the alcohol concentration to the basic value in other operating regions. It is set to a value.
  • control device 30 increases the correction amount with respect to the basic value of the alcohol concentration as the operating range of the internal combustion engine is on the high rotation high load side. If the alcohol concentration is maintained at the basic value, the maximum temperature of the catalyst 10 is predicted to exceed the upper limit temperature as the operating range of the internal combustion engine is on the high rotation high load side. In other words, the risk of deterioration of the catalyst 10 due to overheating increases with increasing rotation and load. Therefore, by changing the correction amount for the basic value of the alcohol concentration according to the operating range of the internal combustion engine as described above, it becomes possible to more reliably prevent the deterioration of the catalyst 10 due to overheating.
  • FIG. 3 is a time chart showing the contents of engine control for making the excess air ratio constant.
  • FIG. 3 shows the relationship between the alcohol concentration of the alcohol mixed fuel adjusted by the blending device 22, the injection amount of the alcohol mixed fuel injected from the fuel injection valve 12, and the excess air ratio.
  • the basic value of the excess air ratio is set to a value at which the exhaust gas purification efficiency by the catalyst 10 is maximized, specifically to 1. If the excess air ratio can be maintained at 1, high oxidation efficiency can be obtained by offsetting the oxidizing component and the reducing component contained in the exhaust gas.
  • the alcohol concentration is increased from its basic value to a high concentration.
  • the injection amount of the alcohol-mixed fuel by the fuel injection valve 12 is also increased.
  • the higher the alcohol concentration is! / The higher the basic value, the greater the fuel injection amount increase correction. This prevents fuel shortage relative to the air volume when the alcohol concentration is increased, and maintains the excess air ratio at a constant value (basic value) before and after the change in alcohol concentration.
  • a change in the amount of alcohol to be injected and a change in the amount of gasoline to be injected are shown in accordance with changes in the alcohol concentration and the fuel injection amount.
  • changing the alcohol concentration and the fuel injection amount means increasing the alcohol injection amount while decreasing the gasoline injection amount.
  • Increasing the alcohol injection amount increases the cooling effect in the combustion chamber, and reducing the gasoline injection amount makes it possible to maintain the excess air ratio at a constant value.
  • FIG. 4 is a time chart showing the contents of engine control for making the torque constant.
  • FIG. 4 shows the relationship between the alcohol concentration of the alcohol mixed fuel adjusted by the blending device 22, the opening of the throttle 8, and the torque.
  • the change in the intake air amount corresponds to the change in the throttle opening.
  • the injection amount of the alcohol-mixed fuel injected from the fuel injection valve 12 is determined according to the intake air amount so that the excess air ratio becomes a basic value! Therefore, as shown by the broken line in FIG. 4, if the throttle opening is constant, the intake air amount and the fuel injection amount are kept constant. In this case, if the alcohol concentration is increased, a torque drop occurs as shown by the broken line in FIG.
  • control device 30 executes the engine control described with reference to FIG. 2, so that the “alcohol supply amount correcting means”, the eighth and The “alcohol concentration correction means” according to the ninth aspect of the invention has been realized!
  • the engine control described with reference to FIG. 3 can be performed by overheating without causing deterioration of emissions due to a change in the excess air ratio. It becomes possible to prevent the deterioration of the catalyst 10.
  • the control device 30 executes each engine control described with reference to FIG. 2 and FIG. 3, so that the “fossil fuel supply amount correcting means” according to the third invention and the tenth invention The “fuel supply amount correcting means” is realized.
  • the control device 30 executes each engine control described with reference to FIGS. 2 and 3, so that the “intake air amount adjusting means” according to the sixth invention and the twelfth invention are achieved.
  • the “intake air amount adjustment means” is realized.
  • the torque change of the internal combustion engine before and after the correction of the alcohol concentration is increased by increasing the injection amount of the alcohol mixed fuel injected from the fuel injection valve 12. Can also be prevented.
  • the fuel injection amount is adjusted so that the torque is constant, instead of making the excess air ratio constant.
  • the overall fuel injection amount is increased, but the breakdown is that the gasoline injection amount is decreased with respect to the increase in the alcohol injection amount. This is because the increase in torque associated with the increase in alcohol is offset by the decrease in gasoline injection.
  • the catalyst temperature is predicted from the engine speed and the engine load.
  • the temperature of the exhaust gas may be measured by a temperature sensor, and the catalyst temperature may be predicted from the exhaust temperature.
  • the temperature of the catalyst may be measured directly by attaching a temperature sensor to the catalyst 10.
  • the first to seventh inventions can also be applied to an alcohol fuel internal combustion engine that is separately provided with an alcohol injection valve for injecting alcohol and a fossil fuel injection valve for injecting fossil fuel such as gasoline.

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  • Combustion & Propulsion (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

La présente invention concerne un moteur à combustion interne à carburant à l'alcool dans lequel la détérioration du catalyseur peut être évitée en abaissant la température des gaz d'échappement tout en réduisant la consommation excessive d'énergie. Un carburant à l'alcool et un carburant fossile sont normalement fournis en fonction d'une proportion de mélange standard. Cependant, lorsque la température du catalyseur a dépassé une température standard donnée ou si cette température est sur le point d'être dépassée, l'alcool rentre en proportion plus importante que le carburant fossile déterminé selon le mélange standard.
PCT/JP2007/072496 2006-11-27 2007-11-21 Moteur à combustion interne à carburant à l'alcool WO2008065936A1 (fr)

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JP2006318102A JP2008133726A (ja) 2006-11-27 2006-11-27 アルコール燃料内燃機関
JP2006-318102 2006-11-27

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WO2011111224A1 (fr) 2010-03-12 2011-09-15 トヨタ自動車株式会社 Dispositif de commande pour moteur à combustion interne
JP2014134128A (ja) * 2013-01-09 2014-07-24 Denso Corp 内燃機関の燃料噴射制御装置
JP6304189B2 (ja) 2015-10-15 2018-04-04 トヨタ自動車株式会社 エンジンの燃料噴射制御装置

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