JP5729380B2 - Fuel supply control device for internal combustion engine - Google Patents
Fuel supply control device for internal combustion engine Download PDFInfo
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- JP5729380B2 JP5729380B2 JP2012511620A JP2012511620A JP5729380B2 JP 5729380 B2 JP5729380 B2 JP 5729380B2 JP 2012511620 A JP2012511620 A JP 2012511620A JP 2012511620 A JP2012511620 A JP 2012511620A JP 5729380 B2 JP5729380 B2 JP 5729380B2
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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
- F02D19/0631—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position by estimation, i.e. without using direct measurements of a corresponding sensor
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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
- F02D19/0639—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
- 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
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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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
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
- F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
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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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/021—Engine temperature
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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)
- Combined Controls Of Internal Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
この発明は、内燃機関の燃料供給制御装置に係り、特に複数の種類の燃料を内燃機関に供給可能な内燃機関の燃料供給制御装置に関する。 The present invention relates to a fuel supply control device for an internal combustion engine, and more particularly to a fuel supply control device for an internal combustion engine capable of supplying a plurality of types of fuel to the internal combustion engine.
車両においては、ガス状燃料を含み性状の異なる２種以上の燃料（例えば、液体のガソリンと気体のＣＮＧ燃料等）を内燃機関に供給可能とし、内燃機関の始動時に特定燃料（ガソリン）を使用するとともに少なくとも内燃機関の温度条件に応じてこれらの燃料を切り換えて供給する多種燃料切換制御を行う制御手段が備えられた内燃機関の燃料供給制御装置を設けたものがある。 In vehicles, it is possible to supply two or more types of fuel (including liquid gasoline and gaseous CNG fuel) that contain gaseous fuel and have different properties to the internal combustion engine, and use a specific fuel (gasoline) when starting the internal combustion engine. In addition, there is a fuel supply control device for an internal combustion engine provided with a control means for performing multi-fuel switching control for switching and supplying these fuels according to at least the temperature conditions of the internal combustion engine.
特許文献１に係る多種燃料機関は、第１の燃料と、第１の燃料に比して未燃成分による触媒温度上昇能力の高い第２の燃料とを切り換えるものであり、所定の触媒活性条件と所定の暖機実行条件とが成立している場合に、第２の燃料を選択するものである。
特許文献２に係る内燃機関の燃料供給装置は、燃料切替要求に基づいて２系統の燃料供給系を選択的に切り換えるものであり、切換前の燃料供給系がある気筒に対する燃料噴射の途中に燃料切換要求が発生した場合に、切換前の燃料供給系が燃料噴射中の気筒より後に燃料噴射する所定気筒から、燃料供給系を切り換えるもので、暖機完了判定を実施して切換許可を出すものである。The multi-fuel engine according to Patent Document 1 switches between a first fuel and a second fuel that has a higher ability to raise the catalyst temperature due to unburned components than the first fuel, and has predetermined catalyst activation conditions. And a predetermined warm-up execution condition are satisfied, the second fuel is selected.
The fuel supply device for an internal combustion engine according to
ところで、従来、上記の特許文献２においては、例えば、ガソリンとＣＮＧ燃料を使用した二元燃料車の場合に、内燃機関が完暖になるまでガソリンでの運転を継続し続けるため、環境負荷の小さいＣＮＧ燃料に早く切り換えたい要求に対しては、満足できない問題があった。
また、燃料の切り換え直前で内燃機関の運転が不安定な状況（オープン制御若しくは燃料系に異常がある場合）にあっても、燃料の切り換えが実施されるため、燃料の切り換え後に、ドライバビリティの悪化が生じるおそれがあった。
更に、ガソリンとＣＮＧ燃料との切換条件が完暖完了判定のみのため、完暖での再始動時には、ガソリンからＣＮＧ燃料に即時に切り換るため、ガソリンを殆ど使用しない状況が発生してしまい、この場合、ガソリンの給油頻度が著しく低下するため、ガソリンの経年劣化により、燃料噴射弁にガム質づまりを引き起こしてしまい、内燃機関の始動不良を招くおそれがあった。By the way, in the above-mentioned
Even if the internal combustion engine operation is unstable immediately before fuel switching (open control or when there is an abnormality in the fuel system), fuel switching is performed. There was a risk of deterioration.
Furthermore, since the switching condition between gasoline and CNG fuel is only the completion determination of complete warming, when restarting at full warming, the gasoline is immediately switched to CNG fuel, resulting in a situation where almost no gasoline is used. In this case, since the frequency of refueling gasoline is remarkably reduced, the aging of the gasoline may cause gum jamming in the fuel injection valve, leading to a poor starting of the internal combustion engine.
そこで、この発明の目的は、燃料の切り換えの最適化を図るとともに、運転者の要求を満足させる燃料切換時間を設定し、且つドライバビリティの悪化を防止する内燃機関の燃料供給制御装置を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel supply control device for an internal combustion engine that optimizes fuel switching, sets a fuel switching time that satisfies a driver's request, and prevents deterioration of drivability. There is.
この発明は、ガス状燃料および前記ガス状燃料とは性状の異なる特定燃料を含む２種以上の燃料を切り替えて内燃機関に供給する多種燃料切換制御を行う制御手段を有する内燃機関の燃料供給制御装置であって、前記制御手段は、前記内燃機関の冷却水の水温であって前記内燃機関が完全暖機状態であると判定できる完暖判定温度よりも低い切換許可水温と、前記内燃機関の始動後の所定の経過時間を確保する始動後切換許可時間とを設定し、前記内燃機関の始動時においては前記特定燃料を前記内燃機関に供給し、前記内燃機関の始動後で監視された前記水温が前記切換許可水温を超え且つ計測された経過時間が前記始動後切換許可時間を超えた場合には前記特定燃料から前記特定燃料よりも環境負荷の低い前記ガス状燃料へ切り換えることを特徴とする。 The present invention, fuel supply for an internal combustion engine having a control means for performing multi-fuel switching control supplied to the internal combustion engine by switching the gaseous fuel and the gaseous fuel and including two or more of the fuel specific fuel having different properties is A control device, wherein the control means includes a switching permission water temperature that is lower than a complete warming determination temperature that is a coolant temperature of the internal combustion engine and that can determine that the internal combustion engine is in a fully warmed-up state, and the internal combustion engine. the set with a predetermined elapsed accepted after start switching換許time to ensure the time after the start, at the start of the internal combustion engine supplies the specific fuel to the internal combustion engine, is monitored after the start of the internal combustion engine this if the elapsed time the water temperature is and measured exceeds the switching換許friendly water temperature exceeds the after-start changeover換許friendly time to switch from the specific fuel said to certain low environmental impact than the fuel the gaseous fuel The features.
この発明の内燃機関の燃料供給制御装置は、環境負荷の低減と内燃機関の始動の安定性の確保とのバランスを図って燃料の切り換えを実施することから、燃料の切り換えの最適化を図るとともに、運転者の要求を満足させる燃料切換時間を設定し、且つドライバビリティの悪化を防止できる。 The fuel supply control device for an internal combustion engine according to the present invention optimizes the fuel switching because the fuel switching is performed while balancing the reduction of the environmental load and ensuring the stability of starting the internal combustion engine. Thus, it is possible to set the fuel switching time that satisfies the driver's request and to prevent the drivability from deteriorating.
この発明は、燃料の切り換えの最適化を図るとともに、運転者の要求を満足させる燃料切換時間を設定し、且つドライバビリティの悪化を防止する目的を、環境負荷の低減と内燃機関の始動の安定性確保とのバランスを図って燃料の切り換えを実施して実現するものである。 The present invention aims to optimize fuel switching, set a fuel switching time that satisfies a driver's request, and prevent deterioration of drivability. This is achieved by switching the fuel in a balance with ensuring safety.
図１〜図３は、この発明の実施例を示すものである。
図３において、１は車両に搭載される内燃機関である。この内燃機関１は、ガス状燃料を含み性状の異なる２種以上の燃料として、例えば、ガソリンからなる液体の特定燃料とＣＮＧ燃料からなる気体のガス状燃料が供給される、いわゆるバイフューエルエンジンである。1 to 3 show an embodiment of the present invention.
In FIG. 3, reference numeral 1 denotes an internal combustion engine mounted on a vehicle. The internal combustion engine 1 is a so-called bi-fuel engine in which a liquid specific fuel made of gasoline and a gaseous gaseous fuel made of CNG fuel are supplied as two or more kinds of fuels containing gaseous fuel and having different properties. is there.
内燃機関１には、２系統の燃料供給装置２として、特定燃料（ガソリン）用の第１の燃料供給装置３とガス状燃料（ＣＮＧ燃料）用の第２の燃料供給装置４とが設けられる。
第１の燃料供給装置３は、内燃機関１に取り付けられた燃料噴射弁５と、この燃料噴射弁５に燃料を導く第１の燃料供給管６と、この第１の燃料供給管６が接続した第１の燃料タンク７とを備える。第１の燃料供給管６の途中には、燃料ポンプ８が設けられている。
第１の燃料タンク７は、特定燃料を貯留するものである。
第２の燃料供給装置４は、内燃機関１に取り付けられた燃料供給弁９と、この燃料供給弁９に燃料を導く第２の燃料供給管１０と、この第２の燃料供給管１０が接続した第２の燃料タンク１１とを備える。第２の燃料供給管１０の途中には、ＣＮＧ燃料の圧力を調整する燃料レギュレータ１２が設けられている。第２の燃料タンク１１は、ガス状燃料を貯留するものである。
この第１の燃料供給装置３と第２の燃料供給装置４とは、燃料供給制御装置１３によって制御される。The internal combustion engine 1 is provided with a first fuel supply device 3 for specific fuel (gasoline) and a second fuel supply device 4 for gaseous fuel (CNG fuel) as two
The first fuel supply device 3 is connected to a
The first fuel tank 7 stores specific fuel.
The second fuel supply device 4 includes a fuel supply valve 9 attached to the internal combustion engine 1, a second
The first fuel supply device 3 and the second fuel supply device 4 are controlled by a fuel
この燃料供給制御装置１３は、燃料噴射弁５と燃料ポンプ８と燃料供給弁９とに連絡する制御手段（ＥＣＭ）１４を備えている。
また、この制御手段１４には、イグニションスイッチ１５と、内燃機関１の冷却水温度である水温を内燃機関の温度として検出する水温センサ１６と、特定燃料の温度を検出する第１の燃料温度センサ１７と、ガス状燃料の温度を検出する第２の燃料温度センサ１８と、内燃機関１の回転数を検出するエンジン回転数センサ１９と、バッテリの電圧を検出するバッテリ電圧センサ２０と、特定燃料とガス状燃料との選択をオート（ＡＵＴＯ）モードで行うか否かを指令する燃料選択スイッチ２１とが接続している。
第１の燃料温度センサ１７は、第１の燃料タンク７の内部又は第１の燃料供給管６に取り付けられる。第２の燃料温度センサ１８は、第２の燃料タンク１１の内部又は第２の燃料供給管１０に取り付けられる。The fuel
The control means 14 includes an
The first
制御手段１４は、特定燃料とガス状燃料とを内燃機関１に供給可能とし、内燃機関１の始動時に特定燃料を使用するとともに少なくとも内燃機関１の温度条件に応じてこれらの燃料を切り換えて供給する多種燃料切換制御を行う燃料切換制御手段１４Ａと、燃料噴射弁５又は燃料供給弁９から内燃機関１への燃料供給量を制御する燃料供給量制御手段１４Ｂと、水温や燃料温度を判定する温度判定手段１４Ｃと、時間を計測する時間計測手段（タイマ）１４Ｄとを備えている。
制御手段１４は、燃料の供給制御を所定の燃料のフィードバック補正制御開始条件（図２参照）が成立した場合に、燃料のフィードバック補正制御を実施して燃料供給量を制御するものである。一般的な空燃比に基づく燃料のフィードバック補正制御で良い。
The control means 14 can supply the specific fuel and the gaseous fuel to the internal combustion engine 1, uses the specific fuel when starting the internal combustion engine 1, and switches and supplies these fuels at least according to the temperature condition of the internal combustion engine 1. The fuel switching control means 14A for performing the multi-fuel switching control, the fuel supply amount control means 14B for controlling the fuel supply amount from the
The control means 14 performs fuel feedback correction control to control the fuel supply amount when a predetermined fuel feedback correction control start condition (see FIG. 2) is satisfied. Fuel feedback correction control based on a general air-fuel ratio may be used.
この実施例において、制御手段１４は、内燃機関１の完全暖機状態と判定できる水温である完暖判定温度よりも低い切換許可水温（ＷＴｃｈｇ）と、内燃機関１の始動後の所定の経過時間を確保する始動後切換許可時間（Ｔｃｈｇ）とを設定し、内燃機関１の始動後で監視された水温が前記切換許可水温（ＷＴｃｈｇ）を超え且つ計測された経過時間が前記始動後切換許可時間（Ｔｃｈｇ）を超えた場合に、特定燃料からガス状燃料へ切り換える。
前記切換許可水温（ＷＴｃｈｇ）は、内燃機関１の始動時の水温に応じて設定されるものであり、内燃機関１の完全暖機状態と判定できる水温である完暖判定温度よりも所定量低い温度として設定される。この切換許可水温（ＷＴｃｈｇ）を用いて特定燃料からガス状燃料への切り換えを判断することは、燃料の切換時期を完全暖機時の場合よりも早めるためである。また、始動時の水温が低い場合は車両の置かれた環境温度が低く水温が上がり難い場合であるので、始動時の水温が低くなるほど切換許可水温（ＷＴｃｈｇ）を低く設定する。
また、前記始動後切換許可時間（Ｔｃｈｇ）は、内燃機関１の始動時の水温に応じて設定されるものであり、内燃機関１を所定時間継続して運転し、特定燃料を所定量消費したと判定できる運転時間として設定される。この始動後切換許可時間（Ｔｃｈｇ）を用いて特定燃料からガス状燃料への切り換えを判断することは、燃料の切換時期を遅らせるためである。
更に、前記切換許可水温（ＷＴｃｈｇ）と前記始動後切換許可時間（Ｔｃｈｇ）とを併せて用い、特定燃料からガス状燃料（ＣＮＧ燃料）への切り換えを判断することにより、短時間の内燃機関１の停止、車両の停止が繰り返される運転状況では、完全暖機温度のみの判断と比べて、特定燃料の消費量を確保、つまり、燃料の温度の高い状況での特定燃料の使用率を向上させることができる。一方、低温時等には、特定燃料を使用して運転する時間が、必要以上に長くなる状態を減らすことができ、これにより、長期にわたって安定した始動性を確保でき、信頼性を確保することができる。始動時の燃料温度が低い場合は車両の置かれた環境温度が低く燃料温度が上がり難い場合であるので、始動時の燃料温度が低くなるほど切換許可水温（ＷＴｃｈｇ）を低く設定する。In this embodiment, the control means 14 includes a switching permission water temperature (WTchg) lower than a complete warming determination temperature, which is a water temperature that can be determined as a fully warmed-up state of the internal combustion engine 1, and a predetermined elapsed time after the start of the internal combustion engine 1. Is set to a post-start-up switching permission time (Tchg) to ensure the above-mentioned, the water temperature monitored after starting the internal combustion engine 1 exceeds the switching-permitted water temperature (WTchg), and the measured elapsed time is the post-start-up switching permission time When (Tchg) is exceeded, the specific fuel is switched to the gaseous fuel.
The switching-permitted water temperature (WTchg) is set according to the water temperature at the start of the internal combustion engine 1, and is lower by a predetermined amount than the complete warming determination temperature, which is the water temperature that can be determined as the fully warmed-up state of the internal combustion engine 1. Set as temperature. The reason for judging the switching from the specific fuel to the gaseous fuel using this switching permission water temperature (WTchg) is to advance the fuel switching timing earlier than in the case of complete warm-up. Further, when the water temperature at the time of starting is low, the environmental temperature where the vehicle is placed is low and it is difficult to increase the water temperature. Therefore, the switching permission water temperature (WTchg) is set lower as the water temperature at the time of starting becomes lower.
The post-startup switching permission time (Tchg) is set according to the water temperature at the start of the internal combustion engine 1, and the internal combustion engine 1 is continuously operated for a predetermined time, and a specific amount of specific fuel is consumed. It is set as the operation time that can be determined. The determination of switching from the specific fuel to the gaseous fuel using the post-startup switching permission time (Tchg) is to delay the fuel switching timing.
Furthermore, by using the switching permission water temperature (WTchg) and the switching permission time after starting (Tchg) in combination, it is determined whether to switch from a specific fuel to a gaseous fuel (CNG fuel). In the driving situation where the vehicle is stopped and the vehicle is stopped repeatedly, the consumption of the specific fuel is ensured, that is, the usage rate of the specific fuel is improved in the situation where the temperature of the fuel is high, compared with the judgment of only the complete warm-up temperature be able to. On the other hand, at low temperatures, etc., it is possible to reduce the state in which the operation time using the specific fuel becomes longer than necessary, thereby ensuring stable startability over a long period of time and ensuring reliability. Can do. When the fuel temperature at the time of starting is low, the environment temperature where the vehicle is placed is low and the fuel temperature is difficult to rise. Therefore, the lower the fuel temperature at the time of starting, the lower the switching permission water temperature (WTchg).
制御手段１４は、内燃機関１に供給される燃料のフィードバック補正量が所定の設定範囲に収まる条件と、燃料のフィードバック補正制御が所定の経過時間を経過している条件とを設定し、監視された水温が前記切換許可水温（ＷＴｃｈｇ）を超え且つ計測された経過時間が始動後切換許可時間（Ｔｃｈｇ）を超えた場合であって、且つこれらの燃料フィードバック制御判定条件（図２参照）が成立する場合に、特定燃料からガス状燃料へ切り換える。
The
更に、制御手段１４は、バッテリ電圧に所定の判定電圧（Ｖｂｃｈｇ）を設定し、バッテリ電圧を監視してバッテリ電圧が前記判定電圧（Ｖｂｃｈｇ）を超えた場合にのみ、特定燃料からガス状燃料へ切り換える。 Further, the control means 14 sets a predetermined determination voltage (Vbchg) to the battery voltage, monitors the battery voltage, and changes from the specific fuel to the gaseous fuel only when the battery voltage exceeds the determination voltage (Vbchg). Switch.
次に、この実施例に係る燃料供給制御を、図１、図２に基づいて説明する。
図１に示すように、制御手段１４のプログラムがスタートした内燃機関１の始動時には（ステップＡ０１）、内燃機関１へは特定燃料が供給される。そして、制御手段１４は、燃料選択スイッチ２１がオート（ＡＵＴＯ）モードが否かを判断する（ステップＡ０２）。
このステップＡ０２がＹＥＳの場合には、制御手段１４のプログラムは、水温が切換許可水温（ＷＴｃｈｇ）を超えたか否かを判断する（ステップＡ０３）。このステップＡ０３がＮＯの場合には、前記ステップＡ０２に戻す。
このステップＡ０３がＹＥＳの場合には、制御手段１４のプログラムは、内燃機関１の始動後の所定の経過時間が始動後切換許可時間（Ｔｃｈｇ）を超えたか否かを判断する（ステップＡ０４）。このステップＡ０４がＮＯの場合には、前記ステップＡ０２に戻す。
このステップＡ０４がＹＥＳの場合には、制御手段１４のプログラムは、燃料のフィードバック制御判定条件を求める（ステップＡ０５）。この燃料のフィードバック制御判定条件については、後述の図２のフローチャートで説明する。
そして、制御手段１４のプログラムは、燃料のフィードバック制御判定条件が成立したか否かを判断する（ステップＡ０６）。このステップＡ０６がＮＯの場合には、前記ステップＡ０２に戻す。
このステップＡ０６がＹＥＳの場合には、制御手段１４のプログラムは、バッテリ電圧が判定電圧（Ｖｂｃｈｇ）を超えたか否かを判断する（ステップＡ０７）。このステップＡ０７がＮＯの場合には、前記ステップＡ０２に戻す。
このステップＡ０７がＹＥＳの場合には、制御手段１４のプログラムは、特定燃料からガス状燃料への切り換えを許可する（ステップＡ０８）。
一方、前記ステップＡ０２がＮＯの場合には、制御手段１４のプログラムは、特定燃料の運転を指示して、ガス状燃料の運転を禁止する（ステップＡ０９）。
前記ステップＡ０８の処理後、又は、前記ステップＡ０９の処理後は、プログラムをエンドとする（ステップＡ１０）。Next, fuel supply control according to this embodiment will be described with reference to FIGS.
As shown in FIG. 1, when the internal combustion engine 1 is started when the program of the control means 14 is started (step A01), the specific fuel is supplied to the internal combustion engine 1. Then, the control means 14 determines whether or not the
When this step A02 is YES, the program of the control means 14 judges whether or not the water temperature has exceeded the switching permission water temperature (WTchg) (step A03). If step A03 is NO, the process returns to step A02.
When this step A03 is YES, the program of the control means 14 determines whether or not a predetermined elapsed time after the start of the internal combustion engine 1 has exceeded a post-startup switching permission time (Tchg) (step A04). When this step A04 is NO, it returns to said step A02.
When this step A04 is YES, the program of the control means 14 calculates | requires the fuel feedback control determination conditions (step A05). The fuel feedback control determination condition will be described later with reference to the flowchart of FIG.
The program of the control means 14 determines whether or not a fuel feedback control determination condition is satisfied (step A06). When this step A06 is NO, it returns to said step A02.
When step A06 is YES, the program of the control means 14 determines whether or not the battery voltage exceeds the determination voltage (Vbchg) (step A07). If step A07 is NO, the process returns to step A02.
When this step A07 is YES, the program of the control means 14 permits switching from the specific fuel to the gaseous fuel (step A08).
On the other hand, when step A02 is NO, the program of the control means 14 instructs the operation of the specific fuel and prohibits the operation of the gaseous fuel (step A09).
After the process of step A08 or after the process of step A09, the program is ended (step A10).
上記の図１のステップＡ０５における燃料フィードバック制御判定条件は、図２に基づいて求められる。
図２に示すように、制御手段１４のプログラムがスタートすると（ステップＢ０１）、先ず、イグニションスイッチ１５がオフか、又は、所定時間以上燃料のフィードバック補正制御中でないか、又は、エンジン回転数が零（０）かを、判断する（ステップＢ０２）。
このステップＢ０２がＹＥＳの場合には、燃料のフィードバック制御判定条件が不成立とする（ステップＢ０３）。
一方、このステップＢ０２がＮＯの場合には、制御手段１４のプログラムは、燃料のフィードバック補正制御を開始したか否かを判断する（ステップＢ０４）。このステップＢ０４がＮＯの場合には、前記ステップＢ０３に移行する。
このステップＢ０４がＹＥＳの場合には、制御手段１４のプログラムは、燃料のフィードバック補正値（燃料フィードバック補正値）が、低い側の所定値（ＣｆｂＬ）を超え且つ高い側の所定値（ＣｆｂＨ）未満か否かを判断する（ステップＢ０５）。このステップＢ０５がＮＯの場合には、前記ステップＢ０３に移行する。
このステップＢ０５がＹＥＳの場合には、制御手段１４のプログラムは、燃料のフィードバック補正制御の開始後の時間（燃料フィードバック開始後時間）が所定時間（Ｔｆｂｃｈｇ）を超えたか否かを判断する（ステップＢ０６）。このステップＢ０６がＮＯの場合には、前記ステップＢ０３に移行する。
このステップＢ０６がＹＥＳの場合には、燃料フィードバック制御判定条件が成立したとする（ステップＢ０７）。
前記ステップＢ０３の処理後、又は、前記ステップＢ０７の処理後は、プログラムを戻す（ステップＢ０８）。The fuel feedback control determination condition in step A05 in FIG. 1 is obtained based on FIG.
As shown in FIG. 2, when the program of the control means 14 is started (step B01), first, the
If step B02 is YES, the fuel feedback control determination condition is not satisfied (step B03).
On the other hand, if step B02 is NO, the program of the control means 14 determines whether or not fuel feedback correction control has been started (step B04). When this step B04 is NO, it transfers to said step B03.
When this step B04 is YES, the program of the control means 14 indicates that the fuel feedback correction value (fuel feedback correction value) exceeds the lower predetermined value (CfbL) and is lower than the higher predetermined value (CfbH). (Step B05). When this step B05 is NO, it transfers to said step B03.
If this step B05 is YES, the program of the control means 14 determines whether or not the time after the start of the fuel feedback correction control (the time after the start of fuel feedback) exceeds a predetermined time (Tfbchg) (step S05). B06). When this step B06 is NO, it transfers to said step B03.
If this step B06 is YES, it is assumed that the fuel feedback control determination condition is satisfied (step B07).
After the process of step B03 or after the process of step B07, the program is returned (step B08).
このように、制御手段１４のプログラムは、内燃機関１の完全暖機状態と判定できる完暖判定温度よりも低い水温である切換許可水温（ＷＴｃｈｇ）と、内燃機関１の始動後の所定の経過時間を確保する始動後切換許可時間（Ｔｃｈｇ）とを設定する。そして、制御手段１４のプログラムは、内燃機関１の始動後で監視された水温が前記切換許可水温（ＷＴｃｈｇ）を超え且つ計測された経過時間が前記始動後切換許可時間（Ｔｃｈｇ）を超えた場合に、特定燃料からガス状燃料へ切り換える。このため、温度の判定では燃料の早期切換可能になり、完全暖機を待たずに環境負荷の小さなガス状燃料に切り換えることができる。また、運転時間の判定では燃料の切換遅延可能とすることができる。これにより、内燃機関１の始動後の安定性を確保した最適な切り換えタイミングを与えることができ、また、長期にわたって安定した始動性を確保でき、信頼性を確保することができる。また、水温に応じて始動後切換許可時間（Ｔｃｈｇ）を設けることによって、燃料選択がオート（ＡＵＴＯ）モードの場合に、燃料の自動切換のタイミングを任意に設定することができる。したがって、経年劣化による特定燃料のガム質づまりを防ぐために、特定燃料の使用頻度を上げて給油回数を増やし、特定燃料の劣化度合いを低下させることで、特定燃料での内燃機関１の始動不良の問題に対応することができる。
また、制御手段１４のプログラムは、内燃機関１に供給される燃料のフィードバック補正量が所定の設定範囲に収まる条件と、燃料のフィードバック補正制御が所定の経過時間を経過している条件とを設定する。そして、制御手段１４のプログラムは、監視された水温が前記切換許可水温（ＷＴｃｈｇ）を超え且つ計測された経過時間が始動後切換許可時間（Ｔｃｈｇ）を超えた場合であって、且つこれらの燃料フィードバック制御判定条件が成立する場合に、特定燃料からガス状燃料へ切り換える。このように、燃料のフィードバック補正制御の変動が抑制された後に燃料を切り換えることになる。つまり、内燃機関１の安定的な運転性を確保できた状態から燃料を切換ることになる。このため、内燃機関１の始動後や、燃料の切換前後でのドライバビリティの悪化を防ぐことができる。
更に、制御手段１４のプログラムは、バッテリ電圧に所定の判定電圧（Ｖｂｃｈｇ）を設定し、バッテリ電圧を監視してバッテリ電圧が前記判定電圧（Ｖｂｃｈｇ）を超えている場合にのみ、特定燃料からガス状燃料へ切り換える。このように、複数の燃料供給経路を持つ燃料供給システムにおいて、システムの各部品（燃料供給弁等）の安定した燃料供給動作が確保された状態下で燃料を切り換えるので、ドライバビリティの悪化を防止できる。システムの各部品（燃料供給弁等）の安定した燃料供給動作が確保できる電圧を判定電圧（Ｖｂｃｈｇ）とすれば良い。
更にまた、前記切換許可水温（ＷＴｃｈｇ）を内燃機関１の始動時の水温に応じて設定することから、暖機前の燃料の切換許可を与えるタイミングを最適に設定できる。As described above, the program of the control means 14 includes a switching permission water temperature (WTchg) that is a water temperature lower than the complete warming determination temperature at which it can be determined that the internal combustion engine 1 is completely warmed up, and a predetermined progress after the internal combustion engine 1 is started. A post-start-up switching permission time (Tchg) that secures the time is set. And the program of the control means 14 is the case where the water temperature monitored after starting the internal combustion engine 1 exceeds the switching permission water temperature (WTchg) and the measured elapsed time exceeds the switching permission time after starting (Tchg). In addition, the specific fuel is switched to the gaseous fuel. For this reason, it becomes possible to switch the fuel early in the temperature determination, and it is possible to switch to a gaseous fuel with a small environmental load without waiting for complete warm-up. Further, in the determination of the operation time, it is possible to delay the fuel switching. Thereby, the optimal switching timing which ensured the stability after the start of the internal combustion engine 1 can be given, stable startability can be ensured over a long period of time, and reliability can be ensured. Further, by providing a post-start-up switching permission time (Tchg) according to the water temperature, the timing of automatic fuel switching can be arbitrarily set when the fuel selection is in the auto (AUTO) mode. Therefore, in order to prevent gumming of the specific fuel due to aging deterioration, the frequency of use of the specific fuel is increased to increase the number of times of refueling, and the degree of deterioration of the specific fuel is reduced, thereby causing a problem of starting failure of the internal combustion engine 1 with the specific fuel. It can correspond to.
The program of the control means 14 sets a condition that the feedback correction amount of the fuel supplied to the internal combustion engine 1 falls within a predetermined setting range, and a condition that the fuel feedback correction control has passed a predetermined elapsed time. To do. And the program of the control means 14 is the case where the monitored water temperature exceeds the switching permission water temperature (WTchg) and the measured elapsed time exceeds the switching permission time (Tchg) after starting, and these fuels When the feedback control determination condition is satisfied, the specific fuel is switched to the gaseous fuel. As described above, the fuel is switched after the fluctuation of the fuel feedback correction control is suppressed. That is, the fuel is switched from a state in which stable operability of the internal combustion engine 1 can be ensured. For this reason, it is possible to prevent the drivability from being deteriorated after the internal combustion engine 1 is started and before and after the fuel is switched.
Further, the program of the control means 14 sets a predetermined determination voltage (Vbchg) to the battery voltage, monitors the battery voltage, and only when the battery voltage exceeds the determination voltage (Vbchg) Switch to fuel. As described above, in a fuel supply system having a plurality of fuel supply paths, the fuel is switched in a state where a stable fuel supply operation of each component (fuel supply valve, etc.) of the system is secured, thereby preventing deterioration of drivability. it can. A voltage that can ensure a stable fuel supply operation of each component (fuel supply valve or the like) of the system may be used as the determination voltage (Vbchg).
Furthermore, since the switching permission water temperature (WTchg) is set according to the water temperature when the internal combustion engine 1 is started, the timing for giving permission to switch the fuel before warm-up can be set optimally.
なお、この実施例においては、切換許可水温（ＷＴｃｈｇ）を内燃機関１に供給する燃料の始動時の燃料温度に応じて設定することも可能である。これにより、暖機前の切換許可を与えるタイミングを最適に設定できる。 In this embodiment, the switching permission water temperature (WTchg) can be set according to the fuel temperature at the start of the fuel supplied to the internal combustion engine 1. Thereby, the timing which gives the switching permission before warm-up can be set optimally.
この発明に係る燃料供給制御装置を、ＬＰＧ燃料等を用いる他の内燃機関に適用可能である。 The fuel supply control device according to the present invention can be applied to other internal combustion engines using LPG fuel or the like.
Claims (5)
前記制御手段は、前記内燃機関の冷却水の水温であって前記内燃機関が完全暖機状態であると判定できる完暖判定温度よりも低い切換許可水温と、前記内燃機関の始動後の所定の経過時間を確保する始動後切換許可時間とを設定し、前記内燃機関の始動時においては前記特定燃料を前記内燃機関に供給し、前記内燃機関の始動後で監視された前記水温が前記切換許可水温を超え且つ計測された経過時間が前記始動後切換許可時間を超えた場合には前記特定燃料から前記特定燃料よりも環境負荷の低い前記ガス状燃料へ切り換えることを特徴とする内燃機関の燃料供給制御装置。 A fuel supply control system for an internal combustion engine having a control means for performing multi-fuel switching control supplied to the internal combustion engine by switching including two or more of the fuel specific fuel having different properties than the gaseous fuel and the gaseous fuel And
The control means includes a switching permission water temperature lower than a complete warming determination temperature at which the internal combustion engine cooling water is determined to be in a fully warmed-up state, and a predetermined temperature after starting the internal combustion engine. course to set the time and the switching換許friendly time after the start of securing, the specific fuel supplied to the internal combustion engine, the water temperature is the switching permission is monitored after the start of the internal combustion engine at the start of the internal combustion engine A fuel for an internal combustion engine characterized by switching from the specific fuel to the gaseous fuel having a lower environmental load than the specific fuel when the water temperature exceeds the measured elapsed time exceeds the post-start switching permission time Supply control device.
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| JP2012511620A JP5729380B2 (en) | 2010-04-20 | 2011-04-12 | Fuel supply control device for internal combustion engine |
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| JP2012511620A JP5729380B2 (en) | 2010-04-20 | 2011-04-12 | Fuel supply control device for internal combustion engine |
| PCT/JP2011/059091 WO2011132569A1 (en) | 2010-04-20 | 2011-04-12 | Internal combustion engine fuel supply control device |
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| JPWO2011132569A1 JPWO2011132569A1 (en) | 2013-07-18 |
| JP5729380B2 true JP5729380B2 (en) | 2015-06-03 |
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| JP2012511620A Active JP5729380B2 (en) | 2010-04-20 | 2011-04-12 | Fuel supply control device for internal combustion engine |
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| JP (1) | JP5729380B2 (en) |
| CN (1) | CN102859150B (en) |
| DE (1) | DE112011101398B4 (en) |
| WO (1) | WO2011132569A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT517215B1 (en) * | 2015-06-23 | 2016-12-15 | Avl List Gmbh | Method for controlling a conditioning unit and consumption meter with such a conditioning unit |
| DE102016211792A1 (en) * | 2016-06-30 | 2018-01-04 | Continental Automotive Gmbh | Gas engine with auxiliary start system and method for operating a gas engine |
| DE102018108097A1 (en) * | 2018-04-05 | 2019-10-10 | Volkswagen Aktiengesellschaft | Method for operating an internal combustion engine of a drive system for a motor vehicle, drive system and motor vehicle |
| CN113153545B (en) * | 2021-04-12 | 2023-04-28 | 上汽红岩汽车有限公司 | Dual-oil-tank switching control system and control method for diesel commercial vehicle |
| JP7251598B1 (en) | 2021-11-10 | 2023-04-04 | いすゞ自動車株式会社 | Fuel supply controller and vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003074415A (en) * | 2001-09-05 | 2003-03-12 | Aisan Ind Co Ltd | Fuel supply method in internal combustion engine and its device |
| JP2005207341A (en) * | 2004-01-23 | 2005-08-04 | Aisan Ind Co Ltd | Fuel supply method and fuel supply device for engine |
| JP2005233135A (en) * | 2004-02-20 | 2005-09-02 | Toyota Motor Corp | Multi-fuel engine |
| JP2007051550A (en) * | 2005-08-15 | 2007-03-01 | Kubota Corp | Liquid fuel engine and dual fuel engine |
| JP2009264354A (en) * | 2008-04-21 | 2009-11-12 | Teito Sangyo Kk | Device for automatic fuel switching after starting bi-fuel engine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006336499A (en) * | 2005-05-31 | 2006-12-14 | Aisan Ind Co Ltd | Fuel supply device for internal combustion engine |
| DE102006025259A1 (en) * | 2006-05-31 | 2007-12-06 | Volkswagen Ag | Bivalent internal combustion engine and method for operating a bivalent internal combustion engine |
| JP4535051B2 (en) * | 2006-09-28 | 2010-09-01 | トヨタ自動車株式会社 | Multi-fuel internal combustion engine |
| JP4765941B2 (en) * | 2007-01-09 | 2011-09-07 | トヨタ自動車株式会社 | Control device and method for internal combustion engine |
| DE102007044522B4 (en) * | 2007-09-18 | 2019-01-17 | Man Diesel & Turbo Se | Device for controlling an internal combustion engine which can be operated with liquid and / or gaseous fuel |
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- 2011-04-12 WO PCT/JP2011/059091 patent/WO2011132569A1/en active Application Filing
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003074415A (en) * | 2001-09-05 | 2003-03-12 | Aisan Ind Co Ltd | Fuel supply method in internal combustion engine and its device |
| JP2005207341A (en) * | 2004-01-23 | 2005-08-04 | Aisan Ind Co Ltd | Fuel supply method and fuel supply device for engine |
| JP2005233135A (en) * | 2004-02-20 | 2005-09-02 | Toyota Motor Corp | Multi-fuel engine |
| JP2007051550A (en) * | 2005-08-15 | 2007-03-01 | Kubota Corp | Liquid fuel engine and dual fuel engine |
| JP2009264354A (en) * | 2008-04-21 | 2009-11-12 | Teito Sangyo Kk | Device for automatic fuel switching after starting bi-fuel engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112011101398B4 (en) | 2016-12-15 |
| JPWO2011132569A1 (en) | 2013-07-18 |
| DE112011101398T5 (en) | 2013-03-21 |
| WO2011132569A1 (en) | 2011-10-27 |
| CN102859150B (en) | 2015-09-23 |
| CN102859150A (en) | 2013-01-02 |
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