CN102906397A - Fuel supply device and method for internal combustion engine - Google Patents
Fuel supply device and method for internal combustion engine Download PDFInfo
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- CN102906397A CN102906397A CN2011800248425A CN201180024842A CN102906397A CN 102906397 A CN102906397 A CN 102906397A CN 2011800248425 A CN2011800248425 A CN 2011800248425A CN 201180024842 A CN201180024842 A CN 201180024842A CN 102906397 A CN102906397 A CN 102906397A
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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
- F02D19/0639—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
- F02D19/0642—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 at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—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 at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
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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
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/061—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
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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
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0613—Switch-over from one fuel to another
- F02D19/0615—Switch-over from one fuel to another being initiated by automatic means, e.g. based on engine or vehicle operating conditions
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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
- F02D19/0626—Measuring or estimating parameters related to the fuel supply system
- F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve 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
- F02D41/0025—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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/16—Indirect injection
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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
- F02D19/0686—Injectors
- F02D19/0692—Arrangement of multiple injectors per combustion chamber
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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
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/089—Layout of the fuel vapour installation
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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
- Y02T10/12—Improving ICE efficiencies
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
A fuel supply device for an internal combustion engine, configured so that, in order to allow the air-fuel ratio to be adjusted appropriately and to ensure the smooth operation of the internal combustion engine, a fuel shortage does not occur when a fuel changeover is performed, and so that multiple fuels are not used at the same time in order to avoid an increase in a control load. The fuel supply device comprises: fuel supply systems provided independently of each other for fuels having different characteristics; and a control means capable of setting, for each of the fuels, an appropriate injection amount corresponding to the amount of intake air of the internal combustion engine. The fuel supply device can selectively switch between the fuels and supply the fuel to the internal combustion engine. When switching from one type of fuel to another is requested, while the injection operation makes the round of all the cylinders starting from the cylinder next to the cylinder into which the injection is being performed when the request for the switching is made, the fuel which is to be used after the switching and is of an amount for correcting the switching is injected into all the cylinders in addition to the standard amount of injection of the fuel which is to be used after the switching, the standard amount being that used in normal operation.
Description
Technical field
The present invention relates to a kind ofly with pluralities of fuel and switch the control technique that fuel offers internal-combustion engine, particularly relate to a kind of fuel supplying device and fuel supply control method with internal-combustion engine of Fuel switching unit.
Background technique
The internal-combustion engine of vehicle exist liquid fuels such as using gasoline and light oil internal-combustion engine, use the internal-combustion engine of the gaseous fuels such as compressed natural gas and liquefied petroleum gas (LPG) (CNG, LPG) or optionally switch the internal-combustion engine that uses gaseous fuel and these two kinds of fuel of liquid fuel etc.
And, be called " dual-fuel vehicle (bifuel car) " with having carried the vehicle that optionally switches the internal-combustion engine that uses gaseous fuel and these two kinds of fuel of liquid fuel.
The fuel supplying device of the internal-combustion engine of this dual-fuel vehicle possesses: fuel supply system, and it is to arrange independently of each other for the different pluralities of fuel of states of matter; And control unit, it can be set and the corresponding an amount of emitted dose of the air inflow of above-mentioned internal-combustion engine each fuel, wherein, can optionally switch the fuel that offers above-mentioned internal-combustion engine and supply with.
Patent documentation 1: Japanese kokai publication hei 6-43814 communique
Patent documentation 2: TOHKEMY 2006-336499 communique
Summary of the invention
The problem that invention will solve
Yet in the fuel supplying device of in the past internal-combustion engine, the fuel supply system that the fuel supply system that liquid fuel is used and gaseous fuel are used is independent and form double system, switches each system of use.
In this fuel supplying device (technology) in the past, when switching fuel, fuel supply system before and after switching changes, therefore the remaining residual fuel before need to suitably adjusting switching residual in the inlet air pathway before and after switching and the excessive and deficiency that is right after the undersupply part of switching rear fuel after switching need to control air fuel ratio.
Particularly in double fuel gaseous fuel car, in the situation of appending the fuel supply system that gaseous fuel uses take the liquid fuel car as the basis, have following trend: be right after after liquid fuel switches to gaseous fuel, the fuel feed of liquid fuel is not enough.
As technology in the past, there be method for handover control and the device of above-mentioned patent documentation 1 disclosed binary fuel.
In the technology that this patent documentation 1 is put down in writing, be right after the fuel before also temporary transient sustainable supply switches after switching fuel, adjust thus the excessive and deficiency of the fuel when switching, but need to supply with simultaneously two kinds of fuel, exist thus the output current of control unit (also can be called " engine controller ") temporarily to increase, to this problem of control complicated of the fuel quantity that mixes.
In addition, the fuel supply system that above-mentioned patent documentation 2 disclosed devices are optionally switch dual systems is switched the fuel supplying device of the internal-combustion engine of the fuel that offers internal-combustion engine, disclose following technology: request is switched in the situation of fuel in to the process of the synchronous injection (sequence-injection) of each cylinder injection feed fuels, controls so that switch fuel from next cylinder and proceeds synchronous injection; Perhaps in the situation that fuel is switched in request, control so that carry out asynchronous injection after switching fuel being right after.
But, although thought over the relation between the switching time of fuel and the spray pattern (spraying synchronously (sequence-injection), asynchronous injection when neat (spray simultaneously, spray)), have room for improvement but when switching, produce feed fuels quantity not sufficient this point, and have the feed fuels amount of also not finding out deficiency when switching and the emitted dose when being about to switch between this problem of relevance.
The present invention finishes in view of above-mentioned technology in the past, purpose is to provide a kind of fuel supplying device and fuel supply control method of following internal-combustion engine: the fuel shortage in the time of can eliminating Fuel switching and adjusting air-fuel ratio exactly, and guarantee that internal-combustion engine turns round smoothly, use when eliminating pluralities of fuel and avoid increasing control overhead.
For the scheme of dealing with problems
The fuel supplying device of the internal-combustion engine of the one embodiment of the present of invention that provide in order to address the above problem possesses: fuel supply system, can supply with independently the fuel of multiple different states of matters; And control unit, its air inflow according to internal-combustion engine is correspondingly set an amount of emitted dose of various fuel, wherein, the fuel supplying device of this internal-combustion engine is by optionally switching to provide fuel to above-mentioned internal-combustion engine, the fuel supplying device of this internal-combustion engine is characterised in that, it is the switching unit of another kind of fuel that above-mentioned control unit is connected with from a kind of Fuel switching, when the Fuel switching request is arranged, the next cylinder of the cylinder that sprays during from this handoff request, in during each cylinder is once switched, whole cylinders are sprayed, the standard emitted dose of its emitted dose during for the common running of fuel after switching and switch correction amount with.
In addition, according to the fuel supply control method for internal-combustion engine that the other embodiments of the invention that provide are provided, use fuel supplying device by optionally switching to provide fuel to above-mentioned internal-combustion engine, this fuel supplying device is for supplying with independently the fuel of multiple different states of matters and providing fuel to fuel supply system, and possesses control unit, this control unit is correspondingly set an amount of emitted dose of various fuel according to the air inflow of internal-combustion engine, the fuel supply control method of this internal-combustion engine is characterised in that, when request is another kind of fuel with a kind of Fuel switching, standard emitted dose when calculating the common running of fuel after switching and switch correction amount with, carry out during from the Fuel switching request the next cylinder of the cylinder that fuel sprays, in during each cylinder is once switched, whole cylinders are sprayed by above-mentioned switch correction amount.
And, optimal way according to an embodiment of the invention, above-mentioned control unit can above-mentioned control unit basis comprise that the operating condition of the rotating speed of the above-mentioned internal-combustion engine that Fuel switching is front determines switch correction amount with the regulation ratio that is lower than standard emitted dose and standard emitted dose, and control above-mentioned switching unit and carry out the switch correction amount injection in the mode of asynchronous injection or synchronously injection, wherein, this asynchronous injection is whole cylinders to be begun to spray by switch correction amount during the discharge time of next cylinder of the cylinder that sprays when handoff request, should spray synchronously is the next cylinder of the cylinder that sprays during from handoff request, in during each cylinder is once switched, whole cylinders are sprayed by switch correction amount successively.
In addition, can be before the injection of the standard emitted dose of each cylinder and any time of last aspirating stroke after finishing, sprayed by above-mentioned switch correction amount independently by this standard injection.
Can also be before the injection of the standard emitted dose of each cylinder or afterwards, sprayed by this standard and to spray by above-mentioned switch correction amount continuously.
The effect of invention
As above-mentioned detailed description, according to the present invention, the fuel supplying device of internal-combustion engine possesses: fuel supply system, can supply with independently the fuel of multiple different states of matters; And control unit, its air inflow according to internal-combustion engine is correspondingly set an amount of emitted dose of various fuel, wherein, the fuel supplying device of this internal-combustion engine is by optionally switching to provide fuel to above-mentioned internal-combustion engine, when request is another kind of fuel from a kind of Fuel switching, the next cylinder of the cylinder that sprays during from this handoff request, in during each cylinder is once switched, whole cylinders are sprayed, the standard emitted dose of its emitted dose during for the common running of fuel after switching and switch correction amount with.
Thereby, do not use simultaneously pluralities of fuel, therefore do not need to consider to distribute, can reduce the driving load of control gear.
In addition, owing to be only to control single-fuel all the time, so the fuel quantity of proofreading and correct by air-fuel ratio feedback control behind the Fuel switching is also single, with not enough, can guarantee good control accuracy as long as consider the excessive of this fuel.
Description of drawings
Fig. 1 is the Sketch figure of the fuel supplying device of the related internal-combustion engine of one embodiment of the present of invention.
Fig. 2 is the control flow chart of the fuel supplying device of the internal-combustion engine shown in above-mentioned Fig. 1.
When being the related switching of the device of the present embodiment, sprays Fig. 3, before sequence-injection, append the sequential chart that sprays in advance.
Fig. 4 similarly is the sequential chart that sprays when switching, sequence-injection is appended to spray.
Embodiment
Below, describe with reference to the accompanying drawings embodiments of the invention in detail.
Embodiment
Fig. 1 ~ Fig. 4 is the figure that one embodiment of the present of invention are shown.
In Fig. 1, the 1st, be equipped on the internal-combustion engine of dual-fuel vehicle.This internal-combustion engine 1 has a plurality of cylinders (not shown), as shown in Figure 1, as gas handling system, connect successively each branched pipe 7 of air cleaner 2, suction tude 3, throttle-valve body 4, pressure stabilizer 5 and intake manifold 6, be provided with the inlet air pathway 8 that is communicated with each cylinder.
In addition, as vent systems, above-mentioned internal-combustion engine 1 connects each branched pipe 10, catalyst converter 11 and the outlet pipe 12 of gas exhaust manifold 9 successively, is provided with the exhaust passageway 13 that is communicated with each cylinder.
Above-mentioned internal-combustion engine 1 is provided with air throttle 14 at the inlet air pathway 8 of throttle-valve body 4.According to the operation amount of not shown accelerator pedal, make this air throttle 14 carry out on-off action by the solar term motor.
In addition, above-mentioned internal-combustion engine 1 is provided with the bypass air path 15 of walking around air throttle 14 and being communicated with above-mentioned inlet air pathway 8.Be provided with idling air quantity control valve 16 (also being called " isc valve ") between the two ends of this bypass air path 15, it adjusts bypass air amount so that the engine speed during idle running becomes target engine speed.
And, in above-mentioned internal-combustion engine 1, at least one party in the gaseous fuels such as compressed natural gas, liquefied petroleum gas (LPG) (CNG, LPG) and the liquid fuels such as gasoline, light oil is offered firing chamber (not shown).In addition, above-mentioned internal-combustion engine 1 possesses the gas fuel container (can also be called " gas holder ") 17 of stored-gas fuel.One distolateral being connected of this gas fuel container 17 and gaseous fuel supplying pipe 18.Another of gaseous fuel supplying pipe 18 is distolateral to be connected with gaseous fuel delivery pipe 19.Gaseous fuel delivery pipe 19 is connected with the gas fuel injection valves 20 of each branched pipe 7 that is arranged at above-mentioned intake manifold 6 respectively.
In addition, on above-mentioned gas fuel feed pipe 18, from gas fuel container 17 sides, dispose successively pressure regulator valve 22, gaseous fuel filter 23 and gas fuel pressure and the gaseous fuel temperature transducer 24 of main stop valve 21, decompression usefulness.
Above-mentioned main stop valve 21 is that 22 pairs of gaseous fuels of above-mentioned pressure regulator valve reduce pressure and are adjusted into suitable pressure and flow for the valve that cuts off gaseous fuel when above-mentioned internal-combustion engine 1 stops.In addition, 23 pairs of gaseous fuels of above-mentioned gas fuel filter filter, and above-mentioned gas fuel pressure and gaseous fuel temperature transducer 24 detect the pressure of gaseous fuel and detect the temperature of gaseous fuel.
In addition, above-mentioned internal-combustion engine 1 possesses the liquid fuel tank 25 of storage liquid fluid fuel.Be provided with the distolateral liquid fuel feed pump that is connected 26 with liquid fuel supply pipe 27 in this liquid fuel tank 25.Another of this liquid fuel supply pipe 27 is distolateral to be connected with liquid fuel delivery pipe 28.And this liquid fuel delivery pipe 28 is connected with the liquid fuel injection valve 29 of each branched pipe 7 that is arranged at above-mentioned intake manifold 6 respectively.
Dispose liquid fuel filter 30 at aforesaid liquid fuel feed pipe 27.Aforesaid liquid fuel-supply pipe 28 is connected with pressure governor 31, and this pressure governor 31 is connected with liquid fuel tank 25 by fuel return pipe 32.This pressure governor 31 plays following effect: adjust the pressure of the liquid fuel that offers liquid fuel injection valve 29, make remaining fuel turn back to liquid fuel tank 25 by fuel return pipe 32.
At this moment, this liquid fuel tank 25 and distolateral being connected of evaporating pipe arrangement 33, the distolateral tank 34 with attracting, emit evaporating liquid fuel of another of this evaporation pipe arrangement 33 is connected.This tank 34 and distolateral being connected that purifies pipe arrangement 35, this inlet air pathway 8 that purifies another distolateral and above-mentioned air throttle 14 downstream sides of pipe arrangement 35 is communicated with.
Be provided with PCV Purge Control Valve 36 at above-mentioned purification pipe arrangement 35,36 pairs of this PCV Purge Control Valves are adjusted from the evaporating liquid fuel quantity that tank 34 offers inlet air pathway 8.
In above-mentioned internal-combustion engine 1, the intake air temperature sensor 37 that detects the intake temperature of inlet air pathway 8 is arranged at suction tude 3, the air flow sensor 38 that detects the charge flow rate of inlet air pathway 8 is arranged at suction tude 3, the air inlet pressure sensor 39 that detects the suction pressure of inlet air pathway 8 is arranged at pressure stabilizer 5, the air-fuel ratio sensor 40 that detects the density of oxygen contained in discharged gas of exhaust passageway 13 is arranged at gas exhaust manifold 9.
Above-mentioned idling air quantity control valve 16, gas fuel injection valves 20, main stop valve 21, gas fuel pressure and gaseous fuel temperature transducer 24, liquid fuel feed pump 26, liquid fuel injection valve 29, PCV Purge Control Valve 36, intake air temperature sensor 37, air flow sensor 38, air inlet pressure sensor 39 and air-fuel ratio sensor 40 are connected with control unit 42, and this control unit 42 consists of the fuel supplying device 41 that at least one party in gaseous fuel and the liquid fuel can be offered the above-mentioned internal-combustion engine 1 of firing chamber.
And this control unit 42 is connected with fuel selection switch 43.Above-mentioned control unit 42 can be set and the corresponding an amount of emitted dose of the air inflow of above-mentioned internal-combustion engine 1 each fuel.In addition, the fuel supplying device 41 of above-mentioned internal-combustion engine 1 can optionally switch the fuel that offers above-mentioned internal-combustion engine 1 and supplies with.
In addition, the control unit 42 of the fuel supplying device 41 of above-mentioned internal-combustion engine 1 has following structure: when request is another fuel from a kind of Fuel switching, the next cylinder of the cylinder that sprays during from this handoff request, in during each cylinder is once switched, whole cylinders are sprayed, the standard emitted dose of its emitted dose during for the common running of fuel after switching and switch correction amount with.
Be described in detail, when the Fuel switching of dual-fuel vehicle, the fuel of supplying with during except steady running, also " before sequence-injection in right amount in advance spray " or " increasing in right amount common sequence-injection amount sprays " append switching the time fuel spray, adjust the air fuel ratio that is right after after switching.
In addition, obtain the best that is suitable for each engine running condition (air amount amount, suction press, engine speed, engine load, air throttle aperture etc.) by the reality test in advance and spray correcting value, set the asynchronous emitted dose that to spray.In addition, in this actual test, with common adaptive testing similarly, as long as be set as the change balance that makes exhaust gas constituents, engine speed.
And, above-mentioned fuel supplying device 41 is to arrange independently of each other for the different pluralities of fuel of states of matter, therefore and be made as and spray independently control to each cylinder, can both selectivity switch as the fuel injection system of the fuel gas of gaseous fuel and as the fuel injection system of the gasoline of liquid fuel and implement to spray synchronously (sequence-injection) and asynchronous injection when neat (spray simultaneously, injection).
And take gasoline engine as the basis, so the fuel injection system of fuel gas compares with the Fuel Petroleum injection apparatus, is configured in the suction tude upstream side.The standard emitted dose refers to basic emitted dose is added various correcting values and the emitted dose that obtains, is final emitted dose, and this emitted dose is used in the air-fuel ratio feedback control of carrying out as running after the common startup.Fuel by being adjusted to authorized pressure and come the control criterion emitted dose as the discharge time of the opening valve time of injection apparatus.Each fuel is set respectively and the corresponding corrected value of stipulating of operating condition.In addition, these fuel supply pressures all are low pressure (about several air pressure).
Fuel shortage (air fuel ratio is less than (deficiency) chemically correct fuel) when switching fuel is adjusted fuel injection amount but have this viewpoint of coherence (becoming a certain fixed proportion) according to its emitted dose when being about to switch.In Fig. 3, set, adjust the emitted dose of asynchronous injection according to engine revolution (with load etc.).
Thereby, do not use simultaneously pluralities of fuel, therefore do not need to consider to distribute, can reduce the driving load of control gear.
In addition, owing to be only to control single-fuel all the time, so the fuel quantity of proofreading and correct by air-fuel ratio feedback control behind the Fuel switching is also single, with not enough, can guarantee good control accuracy as long as consider the excessive of this fuel.
In addition, the operating condition of the rotating speed that comprises above-mentioned internal-combustion engine 1 before based on fuel switches, above-mentioned switch correction amount is determined as being lower than the regulation ratio of standard emitted dose, carry out the injection of switch correction amount by synchronous injection, should spray synchronously for the next cylinder of the cylinder that when request is switched, sprays, in during each cylinder is once switched, for whole cylinders, before common injection, begin to spray independently successively the in advance injection of switch correction amount, the next cylinder of the cylinder that perhaps when request is switched, sprays, in during each cylinder is once switched, whole cylinders are sprayed switch correction amount successively.
That is to say, after each cylinder is all applied switch correction amount, even air fuel ratio produces change because it sprays by the fuel of supplying with temporarily, also can be controlled to be by common air-fuel ratio feedback control the air fuel ratio of expectation, therefore can guarantee the purifying property of waste gas.
In addition, required time of the time that the higher then burning cycle of the rotating speed of above-mentioned internal-combustion engine 1 is required or each operation is shorter, therefore as long as consider the charging efficiency in the cylinder body is decided COEFFICIENT K pinj, and correcting value during switching that this COEFFICIENT K pinj decision will be appended.
Thereby, by applying operating condition (also comprising any in air amount amount, suction press, engine load (rate), the air throttle aperture) correcting value when switching accordingly with the rotating speed that comprises above-mentioned internal-combustion engine 1, the air-fuel ratio regulation that is right after after switching can be at length set, good control accuracy can be guaranteed.
At this, spray, proofread and correct when switching the sequential chart that sprays during the switching of explanatory drawing 3.
In the sequential chart of this Fig. 3,
(1) when at the above-mentioned fuel selection switch 43 of position t0 place operation,
(2) at position t 1 place burner oil is switched to the fuel gas standard injection beginning of the next injection cylinder of the injection cylinder during t0 (time) from gasoline,
(3) before position t2 is in the sequence-injection of each cylinder, spray correcting value when spraying independently an amount of switching (before the standard discharge time and previous aspirating stroke any time after finishing) with standard and spray (combustion gas) when switching fuel.
In addition, in Fig. 3 and Fig. 4 described later, represent the border of stroke with the perpendicular dotted line of uniformly-spaced arranging, the main stroke that carries out the standard injection becomes combustion gas and the common exhaust stroke of gasoline of fuel.
In addition, the sequential chart that sprays when appending of Fig. 4 switched is described in sequence-injection.
In the sequential chart of this Fig. 4,
(1) when at the above-mentioned fuel selection switch 43 of position t0 place operation,
(2) at position t1 place burner oil is switched to fuel gas from gasoline
The standard injection beginning of the next injection cylinder of the injection cylinder during t0 (time),
(3) proofreading and correct the continuous mode of the discharge time that sprays (combustion gas) and the discharge time that applies the standard emitted dose when the sequence-injection of each cylinder so that when applying Fuel switching carries out the phase Calais whole cylinders is sprayed respectively.Correcting value is before the standard emitted dose or carry out continuously afterwards addition when making Fuel switching.
Below, emitted dose when switching is described.
Use is with following formula, sprays (Tchg ms) when the fuel injection pulsewidth (TPms) when spraying when being about to implement to switch multiply by in advance the switching of obtaining by test and calculates the value that obtains with correction factor Kpinj, emitted dose when calculating switching.
Tchg=TP×Kpinj
0≤Kpinj≤1
And, spray (Tchg ms) calculating during switching and be set to the table relevant with engine speed (Ne rpm) or be set to the corresponding table relevant with suction press (Pin kPa) with engine speed (Ne rpm) with correction factor Kpinj.In any situation, all at length divide and set by each engine speed as benchmark (Ne rpm).And, as shown in Figure 3 and Figure 4, spraying (Tchg ms) in the time of will switching calculates with correction factor Kpinj and is made as regulation ratio less than the standard emitted dose, so that proofread and correct the emitted dose of spraying when switching fully less than the standard emitted dose of common sequence-injection, be set as and adjust according to engine speed (Ne rpm), suction press (PinkPa) etc.
In addition, suction press is larger, and then air throttle is more opened and more near barometric pressure.In addition, for intermediate value, utilize the known computing of calculating by interpolation calculation.
The effect (action) of the fuel supplying device 41 of the related internal-combustion engine of the invention described above embodiment 1 then, is described with flow chart according to the control of the fuel supplying device 41 of the above-mentioned internal-combustion engine 1 of Fig. 2.
When the control of the fuel supplying device 41 of this internal-combustion engine 1 during with program start (S101), above-mentioned control unit 42 is transferred to input from the processing (S102) of the Fuel switching signal of above-mentioned fuel selection switch 43.
At this moment, the switching signal that comprises the twocouese of liquid fuel gasoline and gaseous fuel combustion gas from the Fuel switching signal of above-mentioned fuel selection switch 43.Then, judge whether it is the switching signal (S103) of switching from liquid fuel gasoline to the gaseous fuel combustion gas.
The judgement of the switching signal of switching from this liquid fuel gasoline to the gaseous fuel combustion gas whether (S103), in the situation that be judged as "Yes", be transferred to the processing (S104) of proofreading and correct the fuel gas injection amount when calculating the switching corresponding with operating condition (air amount amount, suction press, engine speed, engine load and air throttle aperture etc.).
On the other hand, being judged as "No", namely being in the situation of switching signal from the gaseous fuel combustion gas to liquid fuel gasoline that switch from, be transferred to the processing (S105) of correction gasoline injection amount when calculating the switching corresponding with operating condition (air amount amount, suction press, engine speed, engine load and air throttle aperture etc.).Then, calculating and operating condition (air amount amount, suction press, engine speed, engine load, proofread and correct the processing (S104) of fuel gas injection amount during air throttle aperture etc.) corresponding switching afterwards, be transferred to the processing (S106) of implementing Fuel switching, the correction emitted dose calculated by above-mentioned processing (S104) of gas jet fuel gas independently in advance, perhaps so that the emitted dose continuous mode of the correction emitted dose of calculating by above-mentioned processing (S104) during with common sequence-injection carried out phase Calais gas jet fuel gas (S107), carrying out this processing (S107) afterwards, the control end (S110) of program that is transferred to the fuel supplying device 41 of above-mentioned internal-combustion engine 1.
In addition, calculating and above-mentioned operating condition (air amount amount, suction press, engine speed, engine load and air throttle aperture etc.) proofread and correct gasoline injection amount during corresponding switching processing (S105) afterwards, be transferred to the processing (S108) of implementing Fuel switching, in the processing (S109) of the emitted dose phase Calais injecting LPG in liquefied condition gasoline of the correction emitted dose that will calculate by above-mentioned processing (S105) during with common sequence-injection afterwards, be transferred to the control of fuel supplying device 41 of above-mentioned internal-combustion engine 1 with the end (S110) of program.
According to the preferred embodiment of the invention described above, the fuel shortage when eliminating Fuel switching and adjusting air-fuel ratio exactly, and guarantee that internal-combustion engine turns round smoothly use when can eliminate pluralities of fuel and avoid increasing control overhead.
In addition, the present invention is not limited to above-described embodiment, can carry out other various application and change within not breaking away from the scope that claim puts down in writing.
For example, in an embodiment of the present invention, Fig. 3, Fig. 4 illustrated the sequence-injection of four-cylinder internal-combustion engine, also can similarly implement Fuel switching in the control and spray control but in other internal-combustion engine (three cylinders, six cylinders etc.), spray.
In addition, in an embodiment of the present invention, illustrated to adjust according to suction press (PinkPa) and sprayed (Tchg ms) when switching and calculate and use correction factor Kpinj, still also can replace suction press (Pin kPa) and utilize air throttle aperture (0-100% etc.), engine load rate (0-1.0) etc. to set.
Description of reference numerals
1: internal-combustion engine; 3: suction tude; 6: intake manifold; 8: inlet air pathway; 9: gas exhaust manifold; 11: catalyst converter; 12: outlet pipe; 13: exhaust passageway; 14: air throttle; 17: gas fuel container (can also be called " gas holder "); 18: the gaseous fuel supplying pipe; 19: the gaseous fuel delivery pipe; 20: gas fuel injection valves; 21: main stop valve; 22: the decompression pressure regulator valve; 23: the gaseous fuel filter; 24: gas fuel pressure and gaseous fuel temperature transducer; 25: liquid fuel tank; 26: liquid fuel feed pump; 27: the liquid fuel supply pipe; 28: the liquid fuel delivery pipe; 29: liquid fuel injection valve; 30: the liquid fuel filter; 31: pressure governor; 32: the fuel return pipe; 34: tank; 36: PCV Purge Control Valve; 37: intake air temperature sensor; 38: air flow sensor; 39: air inlet pressure sensor; 40: air-fuel ratio sensor; 41: fuel supplying device; 42: control unit; 43: fuel selection switch.
Claims (6)
1. the fuel supplying device of an internal-combustion engine possesses: fuel supply system, can supply with independently the fuel of multiple different states of matters; And control unit, its air inflow according to internal-combustion engine is correspondingly set an amount of emitted dose of various fuel, and wherein, the fuel supplying device of this internal-combustion engine is by optionally switching to provide fuel to above-mentioned internal-combustion engine, the fuel supplying device of this internal-combustion engine is characterised in that
It is the switching unit of another kind of fuel that above-mentioned control unit is connected with from a kind of Fuel switching, when the Fuel switching request is arranged, the next cylinder of the cylinder that sprays during from this handoff request, in during each cylinder is once switched, whole cylinders are sprayed, the standard emitted dose of its emitted dose during for the common running of fuel after switching and switch correction amount with.
2. the fuel supplying device of internal-combustion engine according to claim 1 is characterized in that,
Above-mentioned control unit determines switch correction amount according to the operating condition of the rotating speed that comprises the above-mentioned internal-combustion engine that Fuel switching is front with the regulation ratio that is lower than standard emitted dose and standard emitted dose, and control above-mentioned switching unit and carry out the switch correction amount injection in the mode of asynchronous injection or synchronously injection, wherein, this asynchronous injection is whole cylinders to be begun to spray by switch correction amount during the discharge time of next cylinder of the cylinder that sprays when handoff request, should spray synchronously is the next cylinder of the cylinder that sprays during from handoff request, in during each cylinder is once switched, whole cylinders are sprayed by switch correction amount successively.
3. the fuel supply control method of an internal-combustion engine, use fuel supplying device by optionally switching to provide fuel to above-mentioned internal-combustion engine, this fuel supplying device is for supplying with independently the fuel of multiple different states of matters and providing fuel to fuel supply system, and possesses control unit, this control unit is correspondingly set an amount of emitted dose of various fuel according to the air inflow of internal-combustion engine, the fuel supply control method of this internal-combustion engine is characterised in that
When request is another kind of fuel with a kind of Fuel switching, standard emitted dose when calculating the common running of fuel after switching and switch correction amount with, carry out during from the Fuel switching request the next cylinder of the cylinder that fuel sprays, in during each cylinder is once switched, whole cylinders are sprayed by above-mentioned switch correction amount.
4. the fuel supply control method of internal-combustion engine according to claim 3 is characterized in that,
Operating condition according to the rotating speed that comprises the above-mentioned internal-combustion engine before the Fuel switching determines switch correction amount with the regulation ratio that is lower than standard emitted dose and standard emitted dose, carry out the spraying treatment of switch correction amount by the mode of asynchronous injection or synchronously injection, this asynchronous injection is whole cylinders to be begun to spray by switch correction amount during the discharge time of next cylinder of the cylinder that sprays when handoff request, should spray synchronously is the next cylinder of the cylinder that sprays during from handoff request, in during each cylinder is once switched, whole cylinders are sprayed by switch correction amount successively.
5. the fuel supply control method of internal-combustion engine according to claim 3 is characterized in that,
Before the injection of the standard emitted dose of each cylinder and any time of last aspirating stroke after finishing, sprayed by above-mentioned switch correction amount independently by this standard injection.
6. the fuel supply control method of internal-combustion engine according to claim 3 is characterized in that,
Before the injection of the standard emitted dose of each cylinder or afterwards, sprayed by this standard and spray by above-mentioned switch correction amount continuously.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010114409A JP5557094B2 (en) | 2010-05-18 | 2010-05-18 | Fuel supply device for internal combustion engine |
| JP2010-114409 | 2010-05-18 | ||
| PCT/JP2011/061291 WO2011145603A1 (en) | 2010-05-18 | 2011-05-17 | Fuel supply device and method for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102906397A true CN102906397A (en) | 2013-01-30 |
| CN102906397B CN102906397B (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180024842.5A Expired - Fee Related CN102906397B (en) | 2010-05-18 | 2011-05-17 | Fuel supply device and method for internal combustion engine |
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| Country | Link |
|---|---|
| JP (1) | JP5557094B2 (en) |
| CN (1) | CN102906397B (en) |
| DE (1) | DE112011101688B4 (en) |
| WO (1) | WO2011145603A1 (en) |
Cited By (2)
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| CN104005870A (en) * | 2012-05-04 | 2014-08-27 | 福特环球技术公司 | Methods and systems for adjusting cylinder air charge |
| CN104454187A (en) * | 2014-10-29 | 2015-03-25 | 阿尔特汽车技术股份有限公司 | Oil and gas dual-purpose fuel switching control method |
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| JP6521689B2 (en) * | 2015-03-24 | 2019-05-29 | 大阪瓦斯株式会社 | Engine system with condensed water treatment function |
| JP7113671B2 (en) | 2018-06-12 | 2022-08-05 | 東京エレクトロン株式会社 | Defoaming device and defoaming method |
| US12085216B2 (en) | 2022-02-17 | 2024-09-10 | Arctic Cat Inc. | Multi-use fuel filler tube |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5557094B2 (en) | 2014-07-23 |
| DE112011101688T5 (en) | 2013-04-25 |
| CN102906397B (en) | 2015-07-22 |
| JP2011241758A (en) | 2011-12-01 |
| WO2011145603A1 (en) | 2011-11-24 |
| DE112011101688B4 (en) | 2018-04-19 |
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