WO2011145603A1 - 内燃機関の燃料供給装置及び燃料供給制御方法 - Google Patents
内燃機関の燃料供給装置及び燃料供給制御方法 Download PDFInfo
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- WO2011145603A1 WO2011145603A1 PCT/JP2011/061291 JP2011061291W WO2011145603A1 WO 2011145603 A1 WO2011145603 A1 WO 2011145603A1 JP 2011061291 W JP2011061291 W JP 2011061291W WO 2011145603 A1 WO2011145603 A1 WO 2011145603A1
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- Prior art keywords
- fuel
- injection
- switching
- internal combustion
- combustion engine
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Classifications
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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
-
- 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
-
- 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 a control technology that uses a plurality of fuels and supplies the internal combustion engine by switching the fuel, and more particularly, to a fuel supply device and a fuel supply control method for an internal combustion engine having a fuel switching means.
- an internal combustion engine of a vehicle As an internal combustion engine of a vehicle, an internal combustion engine using liquid fuel such as gasoline or light oil, an internal combustion engine using gas fuel such as compressed natural gas or liquefied petroleum gas (CNG, LPG), or gas fuel and liquid fuel There are internal combustion engines that select two types of fuel and switch the use.
- liquid fuel such as gasoline or light oil
- gas fuel such as compressed natural gas or liquefied petroleum gas (CNG, LPG)
- CNG, LPG liquefied petroleum gas
- gas fuel and liquid fuel There are internal combustion engines that select two types of fuel and switch the use.
- a vehicle equipped with an internal combustion engine that selects two types of fuels, gas fuel and liquid fuel, and switches the use thereof is called a “bi-fuel vehicle”.
- a fuel supply system for an internal combustion engine of a bi-fuel vehicle sets a fuel supply system provided independently of each other for a plurality of fuels having different properties, and sets an appropriate injection amount according to the intake air amount of the internal combustion engine for each fuel And a control means for enabling the fuel to be supplied to the internal combustion engine by selectively switching.
- Patent Document 1 As a conventional technique, there is a dual fuel switching control method and apparatus disclosed in Patent Document 1 described above.
- the device disclosed in Patent Document 2 is a fuel supply device for an internal combustion engine that selectively switches between two fuel supply systems and switches the fuel supplied to the internal combustion engine, and supplies fuel to each cylinder.
- a technique for controlling to perform asynchronous injection immediately after fuel switching is disclosed.
- the present invention ensures smooth operation of the internal combustion engine while accurately adjusting the air-fuel ratio by eliminating fuel shortage at the time of fuel switching, and eliminates the simultaneous use of multiple fuels and increases the control load.
- An object of the present invention is to provide a fuel supply device and a fuel supply control method for an internal combustion engine that can be avoided.
- a fuel supply apparatus for an internal combustion engine includes a fuel supply system provided independently for a plurality of fuels having different properties, and a fuel supply system for each fuel.
- Control means for setting an appropriate injection amount in accordance with the intake air amount, and a fuel supply device for an internal combustion engine that selectively supplies fuel to be supplied to the internal combustion engine. Is connected to another type of fuel, and when a fuel switching request is made, the fuel after switching is switched for all the cylinders during a round of all the cylinders from the cylinder following the cylinder that is injecting at the time of the switching request.
- a switching correction amount is injected in addition to the standard injection amount during normal operation.
- fuel is supplied from a fuel supply system that is independently provided for a plurality of fuels having different properties.
- a fuel supply device including a control means for supplying and setting an appropriate injection amount according to the intake air amount of the internal combustion engine for each fuel, and selectively switching the fuel to be supplied to the internal combustion engine
- a fuel supply control method for an internal combustion engine to be supplied wherein when a request for switching from one type of fuel to another type of fuel is made, a switching correction amount to be added to a standard injection amount during normal operation of the fuel after switching is calculated, and when a fuel switching request is made The switching correction amount is injected to all the cylinders while making a round of all the cylinders from the cylinder next to the cylinder performing the fuel injection.
- the control means determines the switching correction amount to a predetermined ratio smaller than the standard injection amount based on operating conditions including the rotation speed of the internal combustion engine before fuel switching.
- the injection of the switching correction amount can be performed independently of the standard injection at any time before the injection of the standard injection amount of each cylinder and after the last intake stroke.
- the switching correction amount of injection may be continued to this standard injection before or after the standard injection amount of each cylinder.
- a fuel supply device for an internal combustion engine that can selectively switch and supply fuel to be supplied to the internal combustion engine, and when a switch request from one type of fuel to another type of fuel is requested, injection is performed at the time of the switch request. While making a round of all the cylinders from the next cylinder to the cylinder being performed, the switching correction amount is injected to all the cylinders in addition to the standard injection amount during normal operation of the switched fuel.
- the control is always performed with only a single fuel, the amount of fuel to be corrected by air-fuel ratio feedback control is also single even after the fuel is switched. .
- FIG. 1 is a schematic configuration diagram of a fuel supply device for an internal combustion engine according to an embodiment of the present invention.
- FIG. 2 is a flowchart for controlling the fuel supply device for the internal combustion engine shown in FIG.
- FIG. 3 is a time chart of injection in advance in addition to the switching-time injection and sequential injection according to this embodiment.
- FIG. 4 is also a time chart of injection in addition to the switching injection and sequential injection.
- 1 to 4 show an embodiment of the present invention.
- reference numeral 1 denotes an internal combustion engine mounted on a bi-fuel vehicle.
- This internal combustion engine 1 has a plurality of cylinders (not shown).
- each of the branch pipes 7 of an air cleaner 2, an intake pipe 3, a throttle body 4, a surge tank 5, and an intake manifold 6 serves as an intake system.
- an intake passage 8 communicating with each cylinder is provided.
- the internal combustion engine 1 is provided with an exhaust passage 13 that sequentially connects each branch pipe 10 of the exhaust manifold 9, the catalytic converter 11, and the exhaust pipe 12 as an exhaust system, and communicates with each cylinder.
- the internal combustion engine 1 is provided with a throttle valve 14 in the intake passage 8 of the throttle body 4.
- the throttle valve 14 is opened and closed by a throttle motor in accordance with an operation amount of an accelerator pedal (not shown).
- the internal combustion engine 1 is provided with a bypass air passage 15 that bypasses the throttle valve 14 and communicates with the intake passage 8.
- An idle air amount control valve (also referred to as an “ISC valve”) 16 that adjusts the bypass air amount is provided in the middle of the bypass air passage 15 so that the engine speed during idling becomes the target engine speed. .
- the internal combustion engine 1 includes a gaseous fuel container (also referred to as a “gas cylinder”) 17 that stores gaseous fuel.
- a gaseous fuel container also referred to as a “gas cylinder” 17 that stores gaseous fuel.
- One end of a gaseous fuel supply pipe 18 is connected to the gaseous fuel container 17.
- the other end of the gaseous fuel supply pipe 18 is connected to the gaseous fuel delivery pipe 19.
- a gaseous fuel injection valve 20 provided in each branch pipe 7 of the intake manifold 6 is connected to the gaseous fuel delivery pipe 19.
- the gas fuel supply pipe 18 is provided with a main stop valve 21, a pressure-reducing pressure regulator 22, a gas fuel filter 23, and a gas fuel pressure / gas fuel temperature sensor 24 sequentially from the gas fuel container 17 side. is doing.
- the main stop valve 21 is for shutting off the gaseous fuel when the internal combustion engine 1 is stopped, and the pressure regulating valve 22 depressurizes the gaseous fuel and adjusts it to an appropriate pressure and flow rate.
- the gaseous fuel filter 23 filters gaseous fuel, and the gaseous fuel pressure / gas fuel temperature sensor 24 detects the pressure of the gaseous fuel and also detects the temperature of the gaseous fuel.
- the internal combustion engine 1 includes a liquid fuel tank 25 that stores liquid fuel.
- a liquid fuel pump 26 connected to one end side of the liquid fuel supply pipe 27 is provided.
- the other end of the liquid fuel supply pipe 27 is connected to a liquid fuel delivery pipe 28.
- a liquid fuel injection valve 29 provided in each branch pipe 7 of the intake manifold 6 is connected to the liquid fuel delivery pipe 28.
- a liquid fuel filter 30 is disposed in the liquid fuel supply pipe 27.
- the liquid fuel delivery pipe 28 is connected to a pressure regulator 31 connected to the liquid fuel tank 25 by a fuel return pipe 32.
- the pressure regulator 31 functions to adjust the liquid fuel pressure supplied to the liquid fuel injection valve 29 and return surplus fuel to the liquid fuel tank 25 through the fuel return pipe 32.
- one end side of an evaporation pipe 33 is connected to the liquid fuel tank 25, and the other end side of the evaporation pipe 33 is connected to a canister 34 for adsorbing and releasing evaporated liquid fuel.
- One end of a purge pipe 35 is connected to the canister 34, and the other end communicates with the intake passage 8 downstream of the throttle valve 14.
- the purge pipe 35 is provided with a purge control valve 36, and intake air is supplied from the canister 34.
- the purge control valve 36 adjusts the amount of evaporated liquid fuel supplied from the canister 34 to the intake passage 8.
- an intake air temperature sensor 37 that detects the intake air temperature of the intake passage 8 is provided in the intake pipe 3
- an airflow sensor 38 that detects the intake air flow rate of the intake passage 8 is provided in the intake pipe 3.
- An intake pressure sensor 39 for detecting the pressure is provided in the surge tank 5, and an air-fuel ratio sensor 40 for detecting the exhaust oxygen concentration in the exhaust passage 13 is provided in the exhaust manifold 9.
- the idle air amount control valve 16, the gas fuel injection valve 20, the main stop valve 21, the gas fuel pressure / gas fuel temperature sensor 24, the liquid fuel pump 26, the liquid fuel injection valve 29, the purge control valve 36, the intake air temperature sensor 37, The air flow sensor 38, the intake pressure sensor 39, and the air-fuel ratio sensor 40 are connected to a control means 42 constituting the fuel supply device 41 of the internal combustion engine 1 capable of supplying at least one of gaseous fuel and liquid fuel to the combustion chamber. Yes.
- the fuel selection switch 43 is connected to the control means 42.
- the control means 42 can set an appropriate injection amount corresponding to the intake amount of the internal combustion engine 1 for each fuel.
- the fuel supply device 41 of the internal combustion engine 1 can selectively switch and supply the fuel to be supplied to the internal combustion engine 1.
- control unit 42 of the fuel supply device 41 of the internal combustion engine 1 requests to switch from one type of fuel to another type of fuel, it makes a round of all the cylinders from the cylinder next to the cylinder that is injecting at the time of this switching request. In the meantime, the switching correction amount is injected into all cylinders in addition to the standard injection amount during normal operation of the fuel after switching.
- the amount of asynchronous injection to be injected is determined in advance through actual tests to determine the optimal injection correction amount for each engine operating condition (intake air amount, intake pipe pressure, engine speed, engine load, throttle opening, etc.). In this actual test, similar to a general conformity test, it may be set so as to balance fluctuations in exhaust gas components and engine speed.
- the fuel supply device 41 is provided independently for a plurality of fuels having different properties, and is provided so as to be capable of injection control independently for each cylinder.
- Both the fuel injection device and the fuel injection device for gasoline which is a liquid fuel, can be selectively switched between synchronous injection (sequential injection) and asynchronous injection (simultaneous injection, simultaneous injection). .
- the fuel injection device for gas fuel is arranged on the upstream side of the intake pipe from the fuel injection device for gasoline.
- the standard injection amount is an injection amount obtained by adding various correction amounts to the basic injection amount, and is a final injection amount used for air-fuel ratio feedback control performed as a normal post-startup operation.
- the standard injection amount is controlled by the fuel adjusted to a predetermined pressure and the injection time that is the time when the injection device is opened.
- a predetermined correction value is set for each fuel according to the operating state. Note that these fuel supply pressures are all low pressure (about several atmospheres).
- the fuel injection amount is adjusted.
- the injection amount of asynchronous injection is set and adjusted according to the engine rotation (and load, etc.).
- the control is always performed with only a single fuel, the amount of fuel to be corrected by air-fuel ratio feedback control is also single even after the fuel is switched. .
- the switching correction amount is determined to be a predetermined ratio smaller than the standard injection amount based on the operating condition including the rotation speed of the internal combustion engine 1 before fuel switching, and the cylinder next to the cylinder that performs the injection at the time of switching request Cylinders that perform injection by synchronous injection that starts pre-injection that sequentially performs injection of switching correction amounts for all cylinders independently before normal injection, or during a switching request
- the injection of the switching correction amount is performed by synchronous injection in which the switching correction amount is sequentially injected to all the cylinders while making a round of all the cylinders from the next cylinder.
- the desired air-fuel ratio feedback control performs the desired air-fuel ratio feedback control. Since the fuel ratio can be controlled, the exhaust gas purification performance can be secured.
- the correction amount for switching to be added is determined in consideration of the charging efficiency into the cylinder.
- the coefficient Kpinj may be determined.
- a correction amount at the time of switching according to the operating condition including the rotation speed of the internal combustion engine 1 (including any one of the intake air amount, the intake pipe pressure, the engine load (rate), and the throttle opening) is added.
- the air-fuel ratio adjustment immediately after switching can be set in detail, and good control accuracy can be secured.
- vertical dotted lines arranged at equal intervals indicate the boundary of the stroke, and the main stroke in which the standard injection is performed is the exhaust stroke for both fuel gas and gasoline. ing.
- the injection amount at the time of switching is calculated from the value obtained by multiplying the fuel injection pulse width (TPms) immediately before the execution of the injection at the time of switching by a correction coefficient Kpinj for calculating the injection at the time of switching (Tchg ms) obtained in advance by an experiment according to the following equation. .
- Tchg TP x Kpinj 0 ⁇ Kpinj ⁇ 1
- the correction coefficient for calculating injection at the time of switching (Tchg ms) Kpinj is set as a table for the engine speed (Ne rpm) or a map for the engine speed (Ne rpm) and the intake pipe pressure (Pin kPa). . In either case, the setting is made finely for each reference engine speed (Ne rpm). Then, as shown in FIG. 3 and FIG. 4, the switching injection (Tchg ms) calculation correction coefficient Kpinj is set so that the injection amount of the switching correction injection is sufficiently smaller than the standard injection amount of normal sequential injection. A smaller predetermined ratio is set so that the engine speed can be adjusted by the engine speed (Ne rpm), the intake pipe pressure (Pin kPa), and the like.
- the intermediate value uses a known calculation calculated by interpolation calculation.
- control means 42 proceeds to a process of inputting a fuel switching signal from the fuel selection switch 43 (S102).
- the fuel switching signal from the fuel selection switch 43 includes a bidirectional switching signal between liquid fuel that is gasoline and gaseous fuel that is gas. And it is judged whether it is a switching signal from the liquid fuel which is gasoline to the gaseous fuel which is gas (S103).
- the operating state in the determination of whether or not the signal is a switching signal from liquid fuel that is gasoline to gaseous fuel that is gas (S103), if the determination is YES, the operating state (intake air amount, intake pipe pressure, engine speed, engine The process proceeds to a process (S104) for calculating a switching correction gas injection amount corresponding to a load, a throttle opening degree, and the like.
- the process proceeds to the process of calculating the correction gasoline injection amount at the time of switching (S105). Then, after the process of calculating the switching correction gas injection amount corresponding to the operation state (intake air amount, intake pipe pressure, engine speed, engine load, throttle opening, etc.), fuel switching is performed. The process proceeds to processing (S106), and the corrected fuel injection amount calculated in the above processing (S104) is added independently in advance or continuously with the fuel injection amount at the time of normal sequential injection to inject gaseous fuel as gas. After the process (S107), the process proceeds to the end (S110) of the control program for the fuel supply device 41 of the internal combustion engine 1.
- the sequential injection in the four-cylinder internal combustion engine is described as an example in FIGS. 3 and 4, but in the simultaneous injection control in other internal combustion engines (3 cylinders, 6 cylinders, etc.) Similarly, fuel switching injection control can be performed.
- the correction coefficient Kpinj for calculating the injection at the time of switching has been described by adjusting the intake pipe pressure (Pin kPa), but instead of the intake pipe pressure (Pin kPa), It can also be set by throttle opening (0-100%, etc.), engine load factor (0-1.0), etc.
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- 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
Description
(1)t0位置にて前記燃料選択スイッチ43を操作すると、
(2)t1位置にてガソリンよりガス燃料へ噴射燃料を切り替え、
(t0時の噴射気筒の次の噴射気筒の標準噴射開始時)
(3)t2位置にて燃料切替時噴射(ガス)を各気筒のシーケンシャル噴射の前に適量の切替時補正量を標準噴射から独立して噴射する(標準噴射時間の前であって直前の吸気行程が終了した後の任意の時)。
(1)t0位置にて前記燃料選択スイッチ43を操作すると、
(2)t1位置にてガソリンよりガス燃料へ噴射燃料を切り替え
(t0時の噴射気筒の次の噴射気筒の標準噴射開始時)、
(3)各気筒のシーケンシャル噴射時に標準噴射量を与える噴射時間に燃料切替時補正噴射(ガス)を与える噴射時間を連続するよう加算して全気筒それぞれに噴射する。燃料切替時補正分は標準噴射分の前又は後に連続させて加算する。
0 ≦ Kpinj ≦ 1
そして、切替時噴射(Tchg ms)算出用補正係数Kpinjは、エンジン回転数(Ne rpm)についてのテーブル、又は、エンジン回転数(Ne rpm)および吸気管圧力(Pin kPa)についてのマップとして設定する。いずれの場合も、基準となるエンジン回転数(Ne rpm)毎に細かく分けて設定する。そして、図3及び図4に示す通り、切替時噴射(Tchg ms)算出用補正係数Kpinjを、切替時補正噴射の噴射量が通常のシーケンシャル噴射の標準噴射量より充分小さくなるように標準噴射量より少ない所定割合とし、エンジン回転数(Ne rpm)、吸気管圧力(Pin kPa)などにより調整できるように設定する。
3 吸気管
6 吸気マニホルド
8 吸気通路
9 排気マニホルド
11 触媒コンバータ
12 排気管
13 排気通路
14 スロットルバルブ
17 気体燃料容器(「ガスボンベ」とも換言できる。)
18 気体燃料供給管
19 気体燃料デリバリパイプ
20 気体燃料噴射弁
21 主止弁
22 減圧用の調圧弁
23 気体燃料フィルタ
24 気体燃料圧力・気体燃料温度センサ
25 液体燃料タンク
26 液体燃料ポンプ
27 液体燃料供給管
28 液体燃料デリバリパイプ
29 液体燃料噴射弁
30 液体燃料フィルタ
31 プレッシャレギュレータ
32 燃料戻り管
34 キャニスタ
36 パージ制御弁
37 吸気温センサ
38 エアフローセンサ
39 吸気圧力センサ
40 空燃比センサ
41 燃料供給装置
42 制御手段
43 燃料選択スイッチ
Claims (6)
- 性状の異なる複数の燃料について相互に独立して設ける燃料供給系と、それぞれの燃料について内燃機関の吸気量に応じた適量の噴射量を設定する制御手段とを備え、前記内燃機関に供給する燃料を選択的に切り替えて供給する内燃機関の燃料供給装置において、前記制御手段には、一種の燃料から別種の燃料への切替手段が接続され、燃料切替要求時には、この切替要求時に噴射を行っている気筒の次の気筒から全気筒を一巡する間に全気筒に対して切替後燃料の通常運転時の標準噴射量に加えて切替補正量を噴射することを特徴とする内燃機関の燃料供給装置。
- 前記制御手段は、切替補正量を燃料切替前の前記内燃機関の回転数を含む運転条件に基づいて標準噴射量より少ない所定割合に決定し、前記切替手段に対して、切替要求時に噴射を行っている気筒の次の気筒の噴射時間の間に全気筒に対して切替補正量の噴射を開始する非同期噴射により、または、切替要求時に噴射を行っている気筒の次の気筒から全気筒を一巡する間に全気筒に対して順次切替補正量を噴射する同期噴射により、切替補正量の噴射を行うよう制御する、ことを特徴とする請求項1に記載の内燃機関の燃料供給装置。
- 性状の異なる複数の燃料について相互に独立して設ける燃料供給系より燃料を供給し、それぞれの燃料について内燃機関の吸気量に応じた適量の噴射量を設定可能にする制御手段とを備えた燃料供給装置を用いて、前記内燃機関に供給する燃料を選択的に切り替えて供給する内燃機関の燃料供給制御方法であって、一種の燃料から別種の燃料への切替要求時には、切替後燃料の通常運転時の標準噴射量に加える切替補正量を算出し、燃料切替要求時に燃料の噴射を行っている気筒の次の気筒から全気筒を一巡する間に全気筒に対して前記切替補正量を噴射する、ことを特徴とする内燃機関の燃料供給制御方法。
- 前記切替補正量を、燃料切替前の前記内燃機関の回転数を含む運転条件に基づいて標準噴射量より少ない所定割合に決定し、切替要求時に噴射を行っている気筒の次の気筒の噴射時間の間に全気筒に対して切替補正量の噴射を開始する非同期噴射により、または、切替要求時に噴射を行っている気筒の次の気筒から全気筒を一巡する間に全気筒に対して順次切替補正量を噴射する同期噴射により、切替補正量を噴射する処理を行う、ことを特徴とする請求項3に記載の内燃機関の燃料供給制御方法。
- 前記切替補正量の噴射を各気筒の標準噴射量の噴射の前であって直前の吸気行程が終了した後の任意の時にこの標準噴射から独立して行うことを特徴とする請求項3に記載の内燃機関の燃料供給制御方法。
- 前記切替補正量の噴射を各気筒の標準噴射量の噴射の前又は後にこの標準噴射に連続させて行うことを特徴とする請求項3に記載の内燃機関の燃料供給制御方法。
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CN201180024842.5A CN102906397B (zh) | 2010-05-18 | 2011-05-17 | 内燃机的燃料供给装置以及燃料供给控制方法 |
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US12085216B2 (en) | 2022-02-17 | 2024-09-10 | Arctic Cat Inc. | Multi-use fuel filler tube |
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CN104454187A (zh) * | 2014-10-29 | 2015-03-25 | 阿尔特汽车技术股份有限公司 | 油气两用燃料切换控制方法 |
JP6521689B2 (ja) * | 2015-03-24 | 2019-05-29 | 大阪瓦斯株式会社 | 凝縮水処理機能付きエンジンシステム |
JP7113671B2 (ja) | 2018-06-12 | 2022-08-05 | 東京エレクトロン株式会社 | 脱泡装置および脱泡方法 |
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DE112011101688T5 (de) | 2013-04-25 |
CN102906397A (zh) | 2013-01-30 |
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JP2011241758A (ja) | 2011-12-01 |
DE112011101688B4 (de) | 2018-04-19 |
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