WO2010073361A1 - エンジンシステム - Google Patents
エンジンシステム Download PDFInfo
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- WO2010073361A1 WO2010073361A1 PCT/JP2008/073711 JP2008073711W WO2010073361A1 WO 2010073361 A1 WO2010073361 A1 WO 2010073361A1 JP 2008073711 W JP2008073711 W JP 2008073711W WO 2010073361 A1 WO2010073361 A1 WO 2010073361A1
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- engine
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- mixing ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- 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
- F02D19/082—Premixed fuels, i.e. emulsions or blends
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/0228—Adding fuel and water emulsion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- 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
- F02D19/0665—Tanks, e.g. multiple tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/701—Information about vehicle position, e.g. from navigation system or GPS signal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
- F02D41/0225—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission in relation with the gear ratio or shift lever position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 engine system.
- Patent Document 1 discloses a technique for controlling the mixing ratio of water to fuel to a target mixing ratio in accordance with the accelerator opening. By controlling the mixing ratio according to the accelerator opening, both drivability and emission are achieved.
- An object of the present invention is to provide an engine system capable of supplying a mixed fuel having a desired mixing ratio to the engine at a timing suitable for the operating state of the engine.
- the above object is that a mixing unit capable of mixing the second liquid with the first liquid as the main fuel at a predetermined mixing ratio, and a mixed fuel in which the second liquid is mixed with the first liquid are supplied from the mixing unit.
- This can be achieved by an engine system that controls the target mixing ratio based on a transportation period of the mixed fuel.
- the mixed fuel having a desired mixing ratio can be supplied to the engine at a timing suitable for the operating state of the engine.
- an engine system capable of supplying a mixed fuel having a desired mixing ratio to the engine at a timing suitable for the engine operating state.
- FIG. 1 is a configuration diagram of the engine system.
- the engine system includes an engine 100.
- the engine 100 is a four-cylinder diesel engine.
- the engine 100 can be driven not only by a single fuel but also by a mixed fuel in which water is mixed.
- a mixed fuel in which the main fuel is light oil and water is mixed with the light oil is also referred to as emulsion fuel.
- light oil is used as the first liquid and water is used as the second liquid.
- the second liquid may be ethanol which is alcohol.
- the second liquid may be a liquid in which water is mixed with ethanol.
- the first liquid may be gasoline.
- the engine 100 has an engine body 100a.
- An intake manifold 2 and an exhaust manifold 3 are provided in the engine body 100a.
- the engine main body 100a has a fuel injection valve 4 for injecting fuel into each cylinder. Further, a common rail 5 for supplying high-pressure fuel to each fuel injection valve 4 is provided.
- the intake manifold 2 is connected to an air cleaner 9 via an intake throttle valve 6, an intercooler 7, and a compressor 8 a of an exhaust turbocharger 8, and the exhaust manifold 3 is connected to an exhaust purification device 10 via an exhaust turbine 8 b of the exhaust turbocharger 8. It is connected.
- the intake manifold 2 and the exhaust manifold 3 are connected by an EGR passage 11.
- An EGR control valve 12 and an EGR cooler 13 are disposed in the EGR passage 11.
- the engine system includes a tank 18 for storing light oil and a tank 22 for storing water.
- the engine system includes a mixing tank 21 in which light oil and water are mixed to generate a mixed fuel.
- the mixing tank 21 and the tank 18 communicate with each other through a first supply pipe 19.
- the mixing tank 21 and the tank 22 communicate with each other through a second supply pipe 23.
- the first supply pipe 19 is provided with a first filter 20 and a flow rate control valve 41.
- the second supply pipe 23 is provided with a second filter 24, an electric pump 25, and a flow rate control valve 42.
- the tanks 18 and 22, the mixing tank 21, and the flow rate control valves 41 and 42 correspond to a mixing unit that can mix the second liquid with the first liquid as the main fuel at a predetermined mixing ratio.
- the mixing ratio is a volume ratio of light oil and water mixed in the mixing tank 21.
- a tank storing an emulsifier may be connected to the mixing tank 21.
- the emulsifier has the effect of increasing the affinity between fuel and water.
- a mechanism for stirring fuel and water may be provided in the mixing tank 21.
- the third supply pipe 26 is provided with a high-pressure fuel pump 27.
- the high pressure fuel pump 27 uses the crankshaft of the engine 100 as a drive source.
- the high-pressure fuel pump 27 pumps the mixed fuel generated in the mixing tank 21 into the common rail 5.
- the third supply pipe 26 has a function of transporting and supplying the mixed fuel to the engine 100.
- a return pipe 28 is provided between the common rail 5 and the high-pressure fuel pump 27.
- a return pipe 29 is provided between each fuel injection valve 4 and the high-pressure fuel pump 27. The return pipes 28 and 29 are joined on the way. Return fuel from the common rail 5 and each fuel injection valve 4 is returned to the mixing tank 21 by the high-pressure fuel pump 27.
- the engine system has an air cleaner 9 through which intake air passes and an air flow meter 16 for detecting the amount of intake air.
- the ECU (Electronic control unit) 17 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and controls the operation of the entire engine system.
- CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- the intake throttle valve 6, the electric pump 25, and the air flow meter 16 are electrically connected to the ECU 17. Further, an accelerator opening sensor 32, a boost pressure sensor 33, an engine speed sensor 34, a gear ratio detection sensor 35, and an atmospheric pressure sensor 36 are electrically connected to the ECU 17.
- the gear ratio detection sensor 35 detects a gear ratio of a transmission (not shown).
- the transmission may be an automatic transmission whose gear ratio is automatically changed.
- the transmission may be a gear whose gear ratio is switched by operating a shift lever.
- the navigation device 50 is electrically connected to the ECU 17. Based on the output signal from the navigation device 50, the ECU 17 can acquire information on the road gradient and the road curvature. Note that the navigation device 50 calculates information on the road gradient and the road curvature based on GPS signals received by the navigation device 50.
- the ECU 17 can control the amount of light oil and water supplied to the mixing tank 21 by controlling the operation of the flow control valves 41 and 42. That is, the ECU 17 can control the mixing ratio of water to light oil. Accordingly, the mixed fuel is generated in the mixing tank 21 at the mixing ratio set by the ECU 17.
- Fig. 2 is a map that defines the target mixture ratio. This map is stored in advance in the ROM of the ECU 17.
- the target mixing ratio is controlled according to the operating state of the engine, specifically, the engine speed and the engine load. As shown in FIG. 2, the target mixture ratio is defined to increase as the engine load and the engine speed increase.
- FIG. 3 is a flowchart showing an example of fuel supply control executed by the ECU 17.
- FIG. 4 is an example of a time chart during acceleration.
- FIG. 4 shows, in order from the top, the accelerator opening, the target engine speed Ne_trg, the transient target torque Tq_trg, the target fuel pressure P_trg, q_trg, the target mixture ratio x0_trg, and the target mixture ratio x1_trg.
- ECU17 acquires the load information of the engine 100 and the engine speed Ne (step S1).
- the load information is calculated based on values acquired from the accelerator opening sensor 32, the supercharging pressure sensor 33, and the air flow meter 16.
- the engine speed Ne is acquired from the engine speed sensor 34.
- ECU17 calculates transient target torque Tq_trg and target engine speed Ne_trg based on Ne and load information (step S2). For example, as shown in FIG. 4, during acceleration, the transient target torque Tq_trg and the target engine speed Ne_trg gradually increase due to the increase in the accelerator opening. The actual engine speed and the actual engine torque eventually converge to the transient target torque Tq_trg and the target engine speed Ne_trg corresponding to the accelerator opening.
- the ECU 17 calculates a target fuel pressure P_trg based on the transient target torque Tq_trg and the target engine speed Ne_trg (step S3). Specifically, the ECU 17 calculates the target fuel pressure P_trg based on the map shown in FIG. FIG. 5 is a view showing an example of a map defining the target fuel pressure.
- the target fuel pressure is defined according to the engine speed and the engine load. This map is stored in advance in the ROM of the ECU 17.
- the transient target torque Tq_trg is calculated as the engine load.
- the fuel pressure is set so as to increase as the engine speed and load increase.
- the fuel pressure is the pressure of fuel stored in the common rail 5 and is the pressure of fuel injected from the fuel injection valve 4.
- the ECU 17 calculates a target fuel injection amount q_trg (mm 3 / st) based on the transient target torque Tq_trg, the target engine speed Ne_trg, and the target fuel pressure P_trg (step S4).
- ECU17 calculates target mixing ratio x0_trg based on transient target torque Tq_trg and target engine speed Ne_trg (step S5). Specifically, the ECU 17 calculates based on the map shown in FIG.
- the ECU 17 calculates the transport period T (sec) of the mixed fuel based on the target engine speed Ne_trg and the target fuel injection amount q_trg (step S6).
- the transportation period T is a period required for transportation of fuel from the mixing tank 21 to the fuel injection valve 4.
- the transportation period T is calculated by the following formula.
- V indicates the volume of fuel (mm 3 ) filled in the passage from the mixing tank 21 to the fuel injection valve 4.
- cyl indicates the number of cylinders.
- the above formula (1) is applied to a 4-cycle engine. In the case of a two-cycle engine, the transportation period in the two-cycle engine can be calculated by dividing the transportation period T calculated by the above formula (1) by 2.
- the ECU17 calculates the target mixing ratio when the transportation period T has elapsed from the present time (step S7). Specifically, the ECU 17 estimates the estimated engine speed and the estimated engine load when the transportation period T has elapsed from the present time. Next, the ECU 17 calculates a mixing ratio according to the estimated engine speed and the estimated engine load from the map of FIG. 2, and sets the calculated mixing ratio as a target mixing ratio x1_trg. In other words, the ECU 17 calculates a target mixing ratio x1_trg that takes the transportation period T into account, based on the target mixing ratio x0_trg that does not take the transportation period T into consideration.
- the ECU 17 performs mixing at the target mixing ratio x1_trg (step S8). Specifically, the ECU 17 controls the opening ratio of the flow rate control valves 41 and 42 to control the mixing ratio of the mixed fuel generated in the mixing tank 21 to the target mixing ratio x1_trg.
- the curve showing the target mixing ratio x1_trg is the same as the curve showing the target mixing ratio x0_trg translated in parallel by the transportation period T.
- the ECU 17 can control the target mixing ratio in consideration of the transportation period T. That is, the ECU 17 estimates the operating state of the engine 100 when the transportation period T has elapsed from the present time in consideration of the transportation period T in which the fuel is sent and transported, and the operation of the engine 100 whose mixing ratio is estimated. Control to the target mixing ratio suitable for the condition. As a result, a mixed fuel having a desired mixing ratio can be supplied to engine 100 at a timing suitable for the operating state of engine 100. This prevents drivability and emissions from deteriorating.
- FIG. 6 is a flowchart showing a first modification of the fuel supply control executed by the ECU 17.
- step S12a The ECU 17 calculates the transient target torque Tq_trg and the target engine speed Ne_trg based on this gear ratio (step S12). Thereafter, the ECU 17 executes the processes from steps S13 to S18. Note that the processing from steps S13 to S18 is substantially the same as the processing from steps S3 to S8 described above.
- FIG. 7 is a time chart showing the transient target torque Tq_trg and the target engine speed Ne_trg calculated by the ECU 17 when the gear ratios are different.
- the solid line indicates the transient target torque Tq_trg and the target engine speed Ne_trg when the gear ratio is large
- the dotted line indicates the transient target torque Tq_trg and the target engine speed Ne_trg when the gear ratio is small. Show.
- the case where the gear ratio is large is, in other words, the case where the position of the shift lever is in the low position.
- the case where the gear ratio is small is a case where the position of the shift lever is in the high position.
- the target mixing ratio is controlled to be larger as shown in FIG. In this case, the target mixing ratio is larger as the engine speed and the engine load are larger, whether the target mixing ratio x0_trg without considering the transportation period T or the target mixing ratio x1_trg considering the transportation period T. Be controlled.
- the ECU 17 controls the mixing ratio to increase as the gear ratio increases. Thereby, the mixing ratio is controlled in consideration of the operating state of engine 100, and the deterioration of the emission is prevented.
- the gear ratio may be detected by a sensor that detects the position of the shift lever.
- FIG. 8 is a flowchart showing a second modification of the fuel supply control executed by the ECU 17.
- step S31 acquires a gear position based on the output from the gear ratio detection sensor 35 (step S31), and determines whether the transmission is in a reverse state (step S32). In the case of negative determination, the above-described mixing control is permitted (step S34).
- the ECU 17 sets the mixing ratio to zero (step S33). That is, when the shift lever is at the reverse position, the ECU 17 does not mix water with the light oil. The reason for this will be described below.
- the flushing control is a control for removing the mixed fuel remaining in the cylinder by operating the engine for a predetermined period only with the main fuel before stopping the engine.
- FIG. 9 is a map defining the mixing ratio.
- the ECU 17 controls the target mixing ratio to zero.
- the ECU 17 sets the target mixing ratio to zero. This is because the engine 100 is likely to be stopped after deceleration. Thereby, the time of the flushing control can be shortened.
- the ECU 17 sets the target mixing ratio to zero. Thereby, the fuel transported to the engine 100 immediately before the fuel cut does not include water. After the fuel cut, there is a high possibility that the engine will be stopped, and the time for the flushing control performed when the engine is stopped can be shortened.
- the fuel cut is estimated by the ECU 17 based on the engine speed, engine load, acceleration, change in accelerator opening, and the like.
- FIG. 10 is a flowchart showing a fifth modification of the fuel supply control executed by the ECU 17.
- step S41 acquires the acceleration per predetermined time (step S41). Specifically, the ECU 17 acquires acceleration based on an output signal from the accelerator opening sensor 32. The ECU 17 determines whether or not the acceleration exceeds a predetermined value (step S42). When the acceleration is less than the predetermined value, the ECU 17 permits the above-described mixing control (step S44).
- the ECU 17 sets the target mixing ratio to zero (step S43). This is due to the following reason. This is because, at the time of sudden acceleration where the acceleration exceeds a predetermined value, the reduction of torque at the time of sudden acceleration can be prevented by setting the target mixing ratio to zero. In addition, during sudden acceleration, the engine load increases rapidly, and the calculation accuracy of the target engine torque and target engine speed may be reduced. This is because it may be difficult to accurately control the target mixing ratio.
- FIG. 11 is a flowchart showing a sixth modification of the fuel supply control executed by the ECU 17.
- step S52a the ECU17 acquires road gradient (theta) based on the information from the navigation apparatus 50 after the process of step S51 is performed (step S52a).
- step S52a the ECU 17 calculates the transient target torque Tq_trg and the target engine speed Ne_trg based on the road gradient ⁇ , the engine speed Ne, and the load information (step S52). Thereafter, the ECU 17 executes the processes of steps S53 to S58.
- FIG. 12 is a time chart showing the transient target torque Tq_trg calculated by the ECU 17 when the road gradient ⁇ is different.
- FIG. 12 shows a case where the road gradient ⁇ is an uphill gradient.
- a solid line indicates a case where the road gradient ⁇ is large, and a dotted line indicates a case where the road gradient ⁇ is small.
- the larger the road gradient ⁇ the larger the transient target torque Tq_trg is calculated.
- the ECU 17 performs control by increasing the target mixing ratio.
- the ECU 17 calculates by decreasing the transient target torque Tq_trg as the road gradient ⁇ increases.
- FIG. 13 is a flowchart showing a seventh modification of the fuel supply control executed by the ECU 17.
- step S62a the ECU 17 acquires the curvature R of a road based on the information from the navigation apparatus 50 after execution of the process of step S61 (step S62a).
- step S62a the ECU 17 calculates the transient target torque Tq_trg and the target engine speed Ne_trg based on the curvature R of the road, the engine speed Ne, and the load information (step S62).
- step S62 the ECU 17 executes the processes of steps S63 to S68.
- FIG. 14 is a time chart showing the target engine speed Ne_trg calculated by the ECU 17 when the road curvature R is different.
- a solid line indicates a case where the road curvature R is large, and a dotted line indicates a case where the road curvature R is small.
- the ECU 17 calculates the target engine speed Ne_trg as the road curvature R increases.
- the ECU 17 performs control by decreasing the target mixing ratio.
- the target engine speed Ne_trg is improved.
- the calculation accuracy of the target engine speed Ne_trg is also improved, and the deterioration of emission can be prevented.
- FIG. 15 is a flowchart showing an eighth modification of the fuel supply control executed by the ECU 17.
- ECU17 acquires atmospheric pressure Pa based on the output signal from atmospheric pressure sensor 36 after performing processing of Step S71 (Step S72a). Next, the ECU 17 executes the processes of steps S72 to S77.
- the ECU 17 calculates the correction coefficient K based on the atmospheric pressure Pa, and calculates the target mixing ratio x2_trg (step S78a).
- the correction coefficient K is a coefficient for correcting the target mixing ratio x1_trg.
- FIG. 16 is a map for calculating the correction coefficient K. This map is stored in advance in the ROM of the ECU 17. In this map, the vertical axis represents the correction coefficient K, and the horizontal axis represents atmospheric pressure. This map defines that the correction coefficient K increases as the atmospheric pressure decreases.
- the target mixing ratio x2_trg is obtained by multiplying the target mixing ratio x1_trg by K. Therefore, the target mixing ratio x2_trg is a value that takes atmospheric pressure into consideration. Thus, the ECU 17 increases the target mixing ratio x2_trg as the atmospheric pressure is lower. The reason is as follows. The lower the atmospheric pressure, the lower the oxygen concentration in the atmosphere. When the oxygen concentration is low, the amount of fuel that cannot be combined with oxygen increases and smoke is likely to be generated. Therefore, by increasing the mixing ratio, fuel oxidation can be promoted and smoke can be prevented from being generated.
Abstract
Description
燃料カットが推定される場合には、ECU17は、目標混合割合をゼロにする。これにより、燃料カット直前にエンジン100に輸送される燃料には、水は含まれない。燃料カット後は、エンジンが停止される可能性が高く、エンジン停止時に行われるフラッシング制御の時間を短縮することができる。尚、燃料カットの推定は、エンジン回転数及びエンジン負荷、加速度、アクセル開度の変化、等に基づいてECU17が推定する。
Claims (12)
- 主燃料である第1液体に対して第2液体を所定の混合割合で混合可能な混合部と、
前記第1液体に前記第2液体が混合された混合燃料が前記混合部から輸送されるエンジンと、
前記エンジンの運転状態に基づいて前記混合燃料の前記混合割合を目標混合割合に制御する制御部とを備え、
前記制御部は、前記混合部から前記エンジンに至るまでの前記混合燃料の輸送期間に基づいて、前記目標混合割合を制御する、ことを特徴とするエンジンシステム。 - 前記制御部は、前記エンジンが加速する時には前記目標混合割合を増大させる、ことを特徴とする請求項1に記載のエンジンシステム。
- 前記制御部は、変速機のギア比に基づいて前記目標混合割合を制御する、ことを特徴とする請求項1に記載のエンジンシステム。
- 前記制御部は、前記変速機のギア比が大きいほど前記目標混合割合を増大させる、ことを特徴とする請求項1に記載のエンジンシステム。
- 前記制御部は、前記変速機がリバース状態にある場合には前記目標混合割合をゼロにする、ことを特徴とする請求項1に記載のエンジンシステム。
- 前記制御部は、前記エンジンが減速している場合には、前記目標混合割合をゼロにする、ことを特徴とする請求項1に記載のエンジンシステム。
- 前記制御部は、燃料カットが実行されること推定される場合には、前記目標混合割合をゼロにする、ことを特徴とする請求項1に記載のエンジンシステム。
- 前記制御部は、前記エンジンの加速度が所定値以上の場合には、前記目標混合割合をゼロにする、ことを特徴とする請求項1に記載のエンジンシステム。
- 前記制御部は、ナビゲーション装置から送られる道路の勾配に関する情報及び道路の曲率に関する情報の少なくとも一つに基づいて、前記目標混合割合を制御する、ことを特徴とする請求項1に記載のエンジンシステム。
- 前記制御部は、大気圧が低いほど前記目標混合割合を増大する、ことを特徴とする請求項1に記載のエンジンシステム。
- 前記エンジンは燃料噴射弁を有し、
前記制御部は、前記混合部から前記燃料噴射弁に至るまでの前記混合燃料の前記輸送期間に基づいて、前記目標混合割合を制御する、ことを特徴とする請求項1乃至10の何れかに記載のエンジンシステム。 - 前記制御部は、エンジン回転数及びエンジン負荷に基づいて、目標エンジン回転数及び目標燃料噴射量を算出し、前記目標エンジン回転数及び目標燃料噴射量に基づいて前記輸送期間を算出する、ことを特徴とする請求項1乃至10の何れかに記載のエンジンシステム。
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EP08879157.9A EP2372133B1 (en) | 2008-12-26 | 2008-12-26 | Engine system |
US13/141,820 US8914220B2 (en) | 2008-12-26 | 2008-12-26 | Engine system |
CN200880132518.3A CN102265015B (zh) | 2008-12-26 | 2008-12-26 | 发动机系统 |
PCT/JP2008/073711 WO2010073361A1 (ja) | 2008-12-26 | 2008-12-26 | エンジンシステム |
JP2010543696A JP5304799B2 (ja) | 2008-12-26 | 2008-12-26 | エンジンシステム |
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EP (1) | EP2372133B1 (ja) |
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CN102265015B (zh) | 2014-03-26 |
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EP2372133A1 (en) | 2011-10-05 |
JPWO2010073361A1 (ja) | 2012-05-31 |
EP2372133A4 (en) | 2013-10-30 |
US8914220B2 (en) | 2014-12-16 |
US20110264358A1 (en) | 2011-10-27 |
JP5304799B2 (ja) | 2013-10-02 |
CN102265015A (zh) | 2011-11-30 |
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