JP2003239785A - Lpg supply device of engine - Google Patents
Lpg supply device of engineInfo
- Publication number
- JP2003239785A JP2003239785A JP2002035085A JP2002035085A JP2003239785A JP 2003239785 A JP2003239785 A JP 2003239785A JP 2002035085 A JP2002035085 A JP 2002035085A JP 2002035085 A JP2002035085 A JP 2002035085A JP 2003239785 A JP2003239785 A JP 2003239785A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- fuel
- lpg
- liquid
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
- F02M21/0212—Hydrocarbon fuels, e.g. methane or acetylene comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
-
- 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
- F02D19/02—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 gaseous fuels
- F02D19/026—Measuring or estimating parameters related to the fuel supply system
- F02D19/027—Determining the fuel pressure, temperature or volume flow, the fuel tank fill level or a valve position
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0284—Arrangement of multiple injectors or fuel-air mixers per combustion chamber
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0287—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers characterised by the transition from liquid to gaseous phase ; Injection in liquid phase; Cooling and low temperature storage
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は燃料であるＬＰＧを
噴射方式によりエンジンに供給する装置、詳しくは液相
のＬＰＧを噴射する系と気相のＬＰＧを噴射する系とを
もち、ＬＰＧおよびエンジンの諸状態に応じて系を選択
して液相または気相のＬＰＧをエンジンに供給する装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying LPG, which is a fuel, to an engine by an injection method, and more specifically, it has a system for injecting LPG in a liquid phase and a system for injecting LPG in a gas phase. The present invention relates to a device that selects a system according to various states of 1) and supplies liquid-phase or vapor-phase LPG to an engine.
【０００２】[0002]
【従来の技術】ＬＰＧを燃料に使用するエンジンの高出
力化を図るため、減圧気化することなく高圧液相の状態
で噴射弁を用いて吸気管路に噴射しエンジンに供給する
ことが提案されている。2. Description of the Related Art In order to increase the output of an engine that uses LPG as a fuel, it has been proposed to inject it into an intake pipe using an injection valve in a high-pressure liquid phase state without vaporizing under reduced pressure to supply the engine. ing.
【０００３】周知のように液相のＬＰＧは温度上昇に伴
って気化しやすくなる性質をもっており、温度上昇によ
って燃料タンクから噴射弁に至る液相燃料系内に気相が
発生すると圧力が大幅に変動し、また気相燃料も噴射し
てしまうため噴射弁からの噴射量を狂わせてエンジンを
不調または運転不能とする。As is well known, liquid-phase LPG has a property of being easily vaporized as the temperature rises, and when the temperature rises to generate a gas-phase in the liquid-phase fuel system from the fuel tank to the injection valve, the pressure greatly increases. Since it fluctuates and the gas-phase fuel is also injected, the injection amount from the injection valve is disturbed and the engine malfunctions or becomes inoperable.
【０００４】その対策として、液相燃料系とは別の噴射
弁をもった気相燃料系を具えさせ、液相燃料系内に気相
が発生しない状態のときは液相ＬＰＧを噴射するが、気
相が発生したときは気相ＬＰＧを噴射するように、使用
する燃料系を切換えることが特開昭６３−１８１７２号
公報、特開平１１−２１０５５７号公報に提示されてい
る。As a countermeasure, a gas-phase fuel system having an injection valve different from the liquid-phase fuel system is provided, and liquid-phase LPG is injected when the gas phase is not generated in the liquid-phase fuel system. JP-A-63-18172 and JP-A-11-210557 propose to switch the fuel system to be used so as to inject the gas phase LPG when the gas phase is generated.
【０００５】図８は前記特開昭６３−１８１７２号公報
に記載されているＬＰＧ噴射システムを概略的に示した
図であって、エンジン５１の吸気管路５２に液相燃料系
５４の液相噴射弁５５と気相燃料系６２の気相噴射弁６
３とを設置している。液相燃料系５４は燃料タンク５３
から液相噴射弁５５に至る液相燃料通路５６にポンプ５
７，圧力センサ５８，温度センサ５９を設けてなり、圧
力調整器６１を有する戻し通路６０を具えている。気相
燃料系６２は戻し通路６０または燃料タンク５３から気
相噴射弁６３に至る気相燃料通路６４に気相貯槽６５を
設けたものとしている。FIG. 8 is a diagram schematically showing the LPG injection system described in the above-mentioned Japanese Patent Laid-Open No. 63-18172, in which a liquid phase of a liquid phase fuel system 54 is provided in an intake pipe line 52 of an engine 51. Injection valve 55 and gas-phase injection valve 6 of gas-phase fuel system 62
3 and 3 are installed. The liquid-phase fuel system 54 is a fuel tank 53.
From the pump 5 to the liquid-phase fuel passage 56 from the liquid-phase injection valve 55 to
7, a pressure sensor 58, a temperature sensor 59, and a return passage 60 having a pressure regulator 61. In the vapor phase fuel system 62, a vapor phase storage tank 65 is provided in the vapor passage fuel passage 64 from the return passage 60 or the fuel tank 53 to the vapor phase injection valve 63.
【０００６】そして、圧力センサ５８と温度センサ５９
とによって圧力と温度とを検出して液相燃料通路５６の
液相ＬＰＧに気相が発生していると判断したとき、液相
噴射弁５５を停止して気相噴射弁６３により気相ＬＰＧ
をエンジン５１に供給するものである。A pressure sensor 58 and a temperature sensor 59
When it is determined that the gas phase is generated in the liquid phase LPG in the liquid phase fuel passage 56 by detecting the pressure and the temperature by and, the liquid phase injection valve 55 is stopped and the gas phase injection valve 63 causes the gas phase LPG.
Is supplied to the engine 51.
【０００７】図９は前記特開平１１−２１０５５７号公
報に記載されているＬＰＧ噴射システムを概略的に示し
た図であって、図８のものと同様にエンジン５１の吸気
管路５２に液相燃料系５４の液相噴射弁５５と気相燃料
系６２の気相噴射弁６３とを設置している。液相燃料系
５４は燃料タンク５３から液相噴射弁５５に至る液相燃
料通路５６にポンプ５７，圧力センサ５８，温度センサ
５９を設けてなり、圧力調整器６１を有する戻し通路６
０を具えている。一方、気相燃料系６２は燃料タンク５
３から気相噴射弁６３に至る気相燃料通路６４に圧力調
整器６６，圧力センサ６７，温度センサ６８を設けてな
るものとされ、更にエンジン５１の冷却水温度を検出す
る水温センサ６９を具えている。FIG. 9 is a diagram schematically showing the LPG injection system described in the above-mentioned Japanese Patent Application Laid-Open No. 11-210557, in which the liquid phase in the intake pipe line 52 of the engine 51 is the same as that of FIG. The liquid phase injection valve 55 of the fuel system 54 and the gas phase injection valve 63 of the gas phase fuel system 62 are installed. The liquid-phase fuel system 54 is provided with a pump 57, a pressure sensor 58, and a temperature sensor 59 in a liquid-phase fuel passage 56 extending from the fuel tank 53 to the liquid-phase injection valve 55, and a return passage 6 having a pressure regulator 61.
It has 0. On the other hand, the gas-phase fuel system 62 is connected to the fuel tank 5
3 is provided with a pressure regulator 66, a pressure sensor 67, and a temperature sensor 68 in the gas-phase fuel passage 64 from the gas-phase injection valve 63 to the gas-phase injection valve 63, and a water temperature sensor 69 for detecting the cooling water temperature of the engine 51 is provided. I am.
【０００８】そして、圧力センサ５８と温度センサ５９
とによって圧力と温度とを検出して液相燃料通路５６の
液相ＬＰＧに気相が発生していると判断したとき、液相
噴射弁５５を停止して気相噴射弁６３により気相ＬＰＧ
をエンジン５１に供給する、という基本動作において図
８のものと同じである。しかし、図９のものでは、圧力
センサ６７と温度センサ６８とによって検出した気相燃
料通路６４の気相ＬＰＧの状態、即ち完全気相であるか
不完全気相であるかに応じて気相噴射弁６３の制御モー
ドを変えるようにしており、更に水温センサ６９によっ
て高温再始動と判断したときは気相噴射弁６３により気
相ＬＰＧをエンジンに供給するようにしている。The pressure sensor 58 and the temperature sensor 59
When it is determined that the gas phase is generated in the liquid phase LPG in the liquid phase fuel passage 56 by detecting the pressure and the temperature by and, the liquid phase injection valve 55 is stopped and the gas phase injection valve 63 causes the gas phase LPG.
Is the same as that of FIG. However, in the case of FIG. 9, the gas phase LPG in the gas phase fuel passage 64 detected by the pressure sensor 67 and the temperature sensor 68, that is, the gas phase LPG depending on whether it is a complete gas phase or an incomplete gas phase. The control mode of the injection valve 63 is changed, and when the water temperature sensor 69 determines a high temperature restart, the gas phase injection valve 63 supplies the gas phase LPG to the engine.
【０００９】[0009]
【発明が解決しようとする課題】前記図８，図９のＬＰ
Ｇ噴射システムは、前述のように液相燃料系のＬＰＧの
状態、即ち液相のみであるか気相を発生しているかの判
断を液相燃料通路の圧力と温度とによって行ない、液相
ＬＰＧの供給を継続するか気相ＬＰＧの供給に切換える
かを決定している。従って、ＬＰＧの成分比によっては
判断の誤差が大きく、正確な制御が困難になる、という
問題がある。[Problems to be Solved by the Invention] The LP shown in FIGS.
As described above, the G injection system determines the state of the LPG in the liquid phase fuel system, that is, whether the liquid phase is only the liquid phase or the gas phase is generated based on the pressure and the temperature of the liquid phase fuel passage, and the liquid phase LPG is determined. It is determined whether to continue the supply of LPG or switch to the supply of gas phase LPG. Therefore, there is a problem that there is a large error in judgment depending on the LPG component ratio, making accurate control difficult.
【００１０】また、エンジン始動に際して液相燃料系に
ＬＰＧが満たされていない場合があり、このような場合
は図８のＬＰＧ噴射システムによる始動はもとより、図
９のＬＰＧ噴射システムによる冷間始動以外の始動にあ
たって液相燃料通路のＬＰＧの状態を正確に判断するこ
とが困難であり、始動に長時間を要する場合が生じるこ
とを避けられない。更に、液相燃料系の液相ＬＰＧの状
態のみによって使用する燃料系を選択しているので、液
相燃料系のみの使用が継続するとエンジンルーム内の熱
で高温となった余剰ＬＰＧが燃料タンクに戻り循環を繰
返すことにより、燃料タンク内のＬＰＧの温度・圧力が
上昇する。その結果、噴射弁に高精度のものが要求さ
れ、且つその制御に複雑なシステムが必要となるばかり
か、燃料系を構成する各部品に大きな耐圧強度が必要と
なり、加えて燃料タンクにＬＰＧを補給する必要を生じ
たとき内部が高圧であると充填が困難である、という問
題を生じる。In addition, when the engine is started, the liquid-phase fuel system may not be filled with LPG. In such a case, not only the LPG injection system of FIG. 8 but also the cold start of the LPG injection system of FIG. It is difficult to accurately determine the state of the LPG in the liquid-phase fuel passage at the time of starting, and inevitably a long time is required for starting. Further, since the fuel system to be used is selected only depending on the state of the liquid phase LPG of the liquid phase fuel system, if the use of only the liquid phase fuel system is continued, the excess LPG that has become high temperature due to the heat in the engine room is the fuel tank. The temperature and pressure of the LPG in the fuel tank rises by returning to and repeating the circulation. As a result, not only a highly accurate injection valve is required, and a complicated system is required for its control, but also large pressure resistance strength is required for each component that constitutes the fuel system, and in addition, LPG is added to the fuel tank. When the need for replenishment arises, the problem is that the filling is difficult if the pressure is high inside.
【００１１】本発明は前記従来のＬＰＧ噴射システムが
もっている前述の諸問題を解決するためになされたもの
であって、液相ＬＰＧの噴射と気相ＬＰＧの噴射との切
換えを適切に行なわせること、およびこのことに加えて
エンジンの始動を容易に安定よく行なわせること、更に
これらに加えて燃料タンクの温度・圧力上昇を抑制して
噴射弁、制御システム、耐圧強度に対する要求を軽減さ
せることを目的とし、更にまた切換え時の燃料引継ぎが
円滑に行なわれるＬＰＧ噴射システムとすることを目的
とする。The present invention has been made in order to solve the above-mentioned problems of the conventional LPG injection system, and allows the switching between the liquid phase LPG injection and the gas phase LPG injection to be appropriately performed. In addition to this, to make it easy and stable to start the engine, and to suppress the temperature and pressure rise of the fuel tank in addition to these, to reduce the requirements for the injection valve, control system, and pressure resistance. It is also an object of the present invention to provide an LPG injection system in which fuel transfer can be smoothly performed at the time of switching.
【００１２】[0012]
【課題を解決するための手段】本発明は燃料タンクに充
填されているＬＰＧの液相部分と気相部分とを個別に吸
気管路に噴射しエンジンに供給する液相燃料系と気相燃
料系とを有するＬＰＧ噴射システムがもっている前記問
題点を次のようにして解決させることとした。DISCLOSURE OF THE INVENTION The present invention is directed to a liquid-phase fuel system and a gas-phase fuel for individually injecting a liquid-phase portion and a vapor-phase portion of LPG filled in a fuel tank into an intake pipe to supply them to an engine. It was decided to solve the above-mentioned problems of the LPG injection system having the system as follows.
【００１３】即ち、本発明は前記問題点を解決するため
の第一手段を、燃料タンクに設置されてその温度を検出
するタンク温度センサと；液相燃料系の燃料タンクから
液相噴射弁に至る液相燃料通路に設置されてその内部の
液相ＬＰＧの圧力および温度を検出する液相圧力センサ
および液相温度センサと；気相燃料系の燃料タンクから
気相噴射弁に至る気相燃料通路に設置されてその内部の
気相ＬＰＧの圧力および温度を検出する気相圧力センサ
および気相温度センサと；タンク温度センサと気相圧力
センサまたは液相温度センサとが検出した各値に基いて
ＬＰＧの成分比を算出するＬＰＧ成分計算手段と；ＬＰ
Ｇ成分計算手段により算出された成分比を基準として、
液相圧力センサおよび液相温度センサが検出した各値か
ら液相燃料系内の液相ＬＰＧの状態を判断する液相状態
判定手段と；を具え、液相状態判定手段が液相燃料系内
の液相ＬＰＧを完全な液相と判断したときは液相燃料系
による燃料供給を行なわせ、液相燃料系内に気相を発生
していると判断したときは気相燃料系による燃料供給を
行なわせるようにした。That is, the present invention provides a first means for solving the above-mentioned problems, namely, a tank temperature sensor installed in a fuel tank and detecting the temperature thereof; a fuel tank of a liquid-phase fuel system to a liquid-phase injection valve. A liquid-phase pressure sensor and a liquid-phase temperature sensor which are installed in the liquid-phase fuel passage leading to the liquid-phase fuel passage to detect the pressure and temperature of the liquid-phase LPG therein; A gas-phase pressure sensor and a gas-phase temperature sensor installed in the passage for detecting the pressure and temperature of the gas-phase LPG therein; and based on each value detected by the tank temperature sensor and the gas-phase pressure sensor or the liquid-phase temperature sensor. LPG component calculating means for calculating the component ratio of LPG;
Based on the component ratio calculated by the G component calculating means,
Liquid phase state determination means for determining the state of the liquid phase LPG in the liquid phase fuel system from the respective values detected by the liquid phase pressure sensor and the liquid phase temperature sensor; When the liquid phase LPG is judged to be a complete liquid phase, the fuel is supplied by the liquid phase fuel system, and when it is judged that the gas phase is generated in the liquid phase fuel system, the fuel is supplied by the gas phase fuel system. I was made to do.
【００１４】このように、液相ＬＰＧと気相ＬＰＧとの
切換えを液相燃料系内の液相ＬＰＧの圧力・温度のみに
よることなく、これらに加えＬＰＧの組成を考慮して決
定するものとした第一手段によると、ＬＰＧの成分比の
相違による判断誤差がなくなり、正確且つ高精度の制御
が可能となって、気相発生後も液相燃料系による燃料供
給を行なって混合気過薄となる不都合を回避し、広範囲
の運転条件下で安定したエンジン性能を得ることができ
る。As described above, switching between the liquid phase LPG and the gas phase LPG is determined not only by the pressure and temperature of the liquid phase LPG in the liquid phase fuel system but also by considering the composition of the LPG in addition to these. According to the first means described above, the determination error due to the difference in the LPG component ratio is eliminated, and accurate and highly accurate control is possible, and the fuel is supplied by the liquid phase fuel system even after the gas phase is generated, and the mixture is thinned. It is possible to avoid the inconvenience and to obtain stable engine performance under a wide range of operating conditions.
【００１５】次に、本発明は前記問題点を解決するため
の第二手段を、前記の第一手段に加えてエンジンの温度
を検出するエンジン温度センサと；ＬＰＧ成分計算手段
により算出されたＬＰＧ成分比およびエンジン温度セン
サが検出した値に基いてエンジンの始動時に供給する燃
料を選定する始動燃料選定手段と；を具え、始動燃料選
定手段は始動時のエンジン温度が基準温度よりも低温の
とき液相燃料系に始動燃料供給を行なわせ、高温のとき
気相燃料系に始動燃料供給を行なわせるものとした。Next, according to the present invention, a second means for solving the above-mentioned problems, in addition to the above-mentioned first means, an engine temperature sensor for detecting the temperature of the engine; an LPG calculated by an LPG component calculating means. Starting fuel selecting means for selecting fuel to be supplied at the time of starting the engine based on the component ratio and the value detected by the engine temperature sensor; the starting fuel selecting means is for when the engine temperature at starting is lower than the reference temperature. The liquid phase fuel system is made to supply the starting fuel, and the vapor phase fuel system is made to supply the starting fuel at a high temperature.
【００１６】このように、始動時に供給する燃料をエン
ジン温度によって液相ＬＰＧと気相ＬＰＧのいずれかに
選定することを第一手段に付加した第二手段によると、
第一手段が有する機能に加えて、あらゆる環境条件下で
常にエンジンを容易に且つ安定よく始動させることがで
きる。As described above, according to the second means which is added to the first means, the fuel supplied at the time of starting is selected from either the liquid phase LPG or the gas phase LPG depending on the engine temperature.
In addition to the function of the first means, the engine can always be started easily and stably under all environmental conditions.
【００１７】ここで、始動燃料選定手段をＬＰＧのプロ
パン比率が高いほど基準温度を低温側へ移行させて気相
燃料系による始動燃料供給温度領域を拡張するものとし
た場合は、始動燃料を適確に供給してエンジンの始動性
を更に高めることができる。Here, when the starting fuel selecting means is designed to extend the starting fuel supply temperature range by the vapor phase fuel system by shifting the reference temperature to a lower temperature side as the propane ratio of LPG is higher, the starting fuel is suitable. It can be reliably supplied to further improve the startability of the engine.
【００１８】また、本発明は前記問題点を解決するため
の第三手段を、前記の第一手段または第二手段に加えて
タンク温度センサが検出した値に基いて燃料の切換えを
行なわせる切換指令手段；を具え、切換指令手段は燃料
タンクが設定温度以上となったとき、液相状態判定手段
が液相燃料系による燃料供給を行なわせる判断をしてい
ても、気相燃料系による燃料供給に切換えさせるものと
した。According to the present invention, in addition to the first means or the second means described above, the third means for solving the above-mentioned problems is used to switch the fuel based on the value detected by the tank temperature sensor. The switching command means includes a command means; and when the fuel tank temperature becomes equal to or higher than a set temperature, even if the liquid phase state judging means judges that the fuel is supplied by the liquid phase fuel system, the fuel by the gas phase fuel system is supplied. It was decided to switch to supply.
【００１９】このように、燃料タンクが設定温度以上と
なったとき、燃料供給が液相燃料系で行なわれていても
これを強制的に気相燃料系に切換えさせることを第一手
段または第二手段に付加した第三手段によると、これら
が有する機能に加えて、燃料タンク内の気相ＬＰＧが消
費されて液相ＬＰＧの蒸発量が大幅に増加することによ
る気化潜熱がもたらす冷却効果が、燃料タンク内の温度
・圧力上昇を抑制して噴射弁、制御システム、各部品の
耐圧強度に対する要求を軽減させることができる。As described above, when the fuel tank temperature exceeds the set temperature, the first means or the first means is to forcibly switch the fuel tank to the gas phase fuel system even if the fuel is supplied by the liquid phase fuel system. According to the third means added to the second means, in addition to the functions possessed by these means, the cooling effect brought about by the latent heat of vaporization due to the consumption of the gas phase LPG in the fuel tank and the significant increase in the evaporation amount of the liquid phase LPG By suppressing the temperature / pressure rise in the fuel tank, it is possible to reduce the requirements for the pressure resistance of the injection valve, the control system, and each component.
【００２０】更に、本発明は前記問題点を解決するため
の第四手段を、前記第一手段、第二手段または第三手段
に加えてエンジンの回転速度を検出する回転速度センサ
と；回転速度センサが検出した値に応じて燃料切換え時
における液相燃料系の燃料供給停止・開始時期を気相燃
料系の燃料供給開始・停止時期よりも遅らせる時間を設
定する遅延時間設定手段と；を具え、遅延時間設定手段
は液相燃料系から気相燃料系への切換え時に後者の燃料
供給開始時点から設定された時間だけ遅れて前者の燃料
供給を停止させ、気相燃料系から液相燃料系への切換え
時に前者の燃料供給停止時点から設定された時間だけ遅
れて後者の燃料供給を開始させるものとした。Further, the present invention provides a fourth means for solving the above-mentioned problems, in addition to the first means, the second means or the third means, a rotation speed sensor for detecting the rotation speed of the engine; Delay time setting means for setting a time for delaying the fuel supply stop / start timing of the liquid phase fuel system at the time of fuel switching from the fuel supply start / stop timing of the gas phase fuel system according to the value detected by the sensor; The delay time setting means stops the former fuel supply with a delay of a set time from the latter fuel supply start time at the time of switching from the liquid phase fuel system to the gas phase fuel system, and changes the gas phase fuel system to the liquid phase fuel system. When switching to, the latter fuel supply is started after a delay of a set time from the former fuel supply stop time.
【００２１】本発明は液相ＬＰＧを吸気管路に噴射して
エンジンに供給することを基本とし、特定条件で気相Ｌ
ＰＧを吸気管路に噴射してエンジンに供給するものであ
り、液相噴射弁はガソリンエンジンの噴射弁と同様に各
気筒に対応させて吸気マニホルド枝管のそれぞれに設置
して各気筒への応答性・分配性を良好なものとし、気相
噴射弁は一時的に使用されるものであることから経済性
を考慮して少ない個数を気筒分配性を考慮して液相噴射
弁よりも上流側に設置すること、殊に一個のみとしてこ
れを吸気マニホルド集合部またはそれよりも上流側に設
置することが好ましい。The present invention is based on the fact that the liquid phase LPG is injected into the intake pipe to be supplied to the engine, and the gas phase L under a specific condition.
PG is injected into the intake pipe to be supplied to the engine, and the liquid-phase injection valve is installed in each intake manifold branch pipe corresponding to each cylinder in the same manner as the gasoline engine injection valve. The responsiveness and distributability are good, and the gas-phase injection valve is used temporarily, so a small number is considered upstream from the liquid-phase injection valve in consideration of the cylinder distributability in consideration of economy. It is preferable to install it on the side of the intake manifold, or particularly on the intake manifold collecting part or on the upstream side thereof.
【００２２】燃料切換え時に液相燃料系の燃料供給停止
・開始の時期を前述のようにすることを第一手段、第二
手段または第三手段に付加した第四手段によると、これ
らが有する機能に加えて、特に液相噴射弁と気相噴射弁
を前記の配置とした場合における燃料切換え時の空燃比
変動が解消され、運転性と排気状態を良好に維持するこ
とができる。According to the fourth means in addition to the first means, the second means or the third means, the timing of stopping and starting the fuel supply of the liquid phase fuel system at the time of fuel switching is added to the functions of these means. In addition, in particular, when the liquid phase injection valve and the gas phase injection valve are arranged as described above, fluctuations in the air-fuel ratio at the time of fuel switching are eliminated, and operability and an exhaust state can be favorably maintained.
【００２３】ここで、遅延時間設定手段をエンジンの回
転速度が高いほど遅延させる時間を短く設定するものと
した場合は、燃料切換え時の空燃比変動を更に確実に解
消することができる。Here, if the delay time setting means is set to shorten the delay time as the engine speed increases, the fluctuation of the air-fuel ratio at the time of fuel switching can be more reliably eliminated.
【００２４】[0024]
【発明の実施の形態】以下に図面を参照して本発明の実
施の形態を説明する。図１は本発明に係るＬＰＧ噴射シ
ステムの実施の一形態を示す配置図であって、１はエン
ジン、２はスロットルボディ３、吸気マニホルド５を含
む吸気管路、６は排気管路、７は耐圧容器からなる燃料
タンク、８は電子式制御ユニット、ＦＬは液相燃料系、
ＦＧは気相燃料系である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a layout view showing an embodiment of an LPG injection system according to the present invention, in which 1 is an engine, 2 is a throttle body 3, an intake pipe line including an intake manifold 5, 6 is an exhaust pipe line, and 7 is Fuel tank consisting of pressure vessel, 8 electronic control unit, FL liquid-phase fuel system,
FG is a gas phase fuel system.
【００２５】液相燃料系ＦＬは燃料タンク７の液相ＬＰ
Ｇに浸漬され、フィルタを通して吸込んだ高圧の液相Ｌ
ＰＧを更に加圧する燃料ポンプ１２と、これより送出し
た液相ＬＰＧを燃料ギャラリ１７に送る液相燃料通路１
１と、この通路１１に設置した電磁駆動の液相遮断弁１
４，液相圧力センサ１５，液相温度センサ１６と、燃料
ギャラリ１７に接続されてエンジン１の各気筒に対応し
て吸気マニホルド５の枝管のそれぞれに設置した液相噴
射弁１８と、液相圧力調整器２０を有し液相燃料通路１
１の燃料ギャラリ１７に接近した個所から分岐して燃料
タンク７に接続した液相戻し通路１９とを具えている。The liquid phase fuel system FL is the liquid phase LP of the fuel tank 7.
High-pressure liquid phase L immersed in G and sucked through the filter
A fuel pump 12 that further pressurizes the PG, and a liquid-phase fuel passage 1 that sends the liquid-phase LPG delivered from this to the fuel gallery 17.
1 and an electromagnetically driven liquid phase cutoff valve 1 installed in this passage 11
4, a liquid-phase pressure sensor 15, a liquid-phase temperature sensor 16, a liquid-phase injection valve 18 connected to the fuel gallery 17 and installed in each branch pipe of the intake manifold 5 corresponding to each cylinder of the engine 1, Liquid phase fuel passage 1 having phase pressure regulator 20
1, a liquid phase return passage 19 branched from a portion close to the fuel gallery 17 and connected to the fuel tank 7.
【００２６】液相圧力センサ１５および液相温度センサ
１６は燃料ギャラリ１７に近い個所に設置され、また液
相噴射弁１８はエンジン１の吸気ポートに接近した個所
に設置されており、噴射直前の液相ＬＰＧの状態を検出
し且つエンジン入口近くで噴射させることにより、適正
量の液相ＬＰＧを応答よくエンジンに供給できるように
なっている。The liquid-phase pressure sensor 15 and the liquid-phase temperature sensor 16 are installed near the fuel gallery 17, and the liquid-phase injection valve 18 is installed near the intake port of the engine 1. By detecting the state of the liquid phase LPG and injecting it near the engine inlet, an appropriate amount of the liquid phase LPG can be supplied to the engine with good response.
【００２７】一方、気相燃料系ＦＧは燃料タンク７の気
相ＬＰＧに入口を開口させた気相燃料通路２２と、この
通路２２に設置した電磁駆動の気相遮断弁２３，気相圧
力調整器２４，気相圧力センサ２５，気相温度センサ２
６と、吸気マニホルド５の集合部のスロットルボディ３
に近い個所に設置した一個の気相噴射弁２７とを具えて
いる。もっとも、気相噴射弁２７は複数個を各気筒に均
等分配できるように適宜個所に設置してもよい。On the other hand, the gas-phase fuel system FG has a gas-phase fuel passage 22 having an inlet opening to the gas-phase LPG of the fuel tank 7, an electromagnetically driven gas-phase shutoff valve 23 installed in this passage 22, and a gas-phase pressure adjustment. Vessel 24, gas phase pressure sensor 25, gas phase temperature sensor 2
6 and the throttle body 3 at the collecting portion of the intake manifold 5.
It is equipped with one gas-phase injection valve 27 installed at a location close to. However, a plurality of gas phase injection valves 27 may be installed at appropriate locations so that a plurality of gas phase injection valves 27 can be evenly distributed to each cylinder.
【００２８】気相圧力センサ２５および気相温度センサ
２６は気相噴射弁２７に近い個所に設置されており、噴
射直前の気相ＬＰＧの状態を検出して適正量の気相ＬＰ
Ｇをエンジンに供給するようになっている。The gas phase pressure sensor 25 and the gas phase temperature sensor 26 are installed near the gas phase injection valve 27, and detect the state of the gas phase LPG immediately before injection to detect an appropriate amount of gas phase LP.
G is supplied to the engine.
【００２９】エンジン１にはその温度、一般には冷却水
の温度を検知するエンジン温度センサ３１および回転速
度を検知する回転速度センサ３２とが付設され、これら
のほかに排気管路６に設置されて排気状態を検知する酸
素センサ、吸気管路２の絞り弁４上流側に設置されて吸
入空気量を検知する空気流量センサ、絞り弁４の位置を
検知するスロットル開度センサなどエンジン１の状態を
検知するセンサ類が設置されていて、これらが検出した
値が電子式制御ユニット８に送られて液相噴射弁１８，
気相噴射弁２７を制御することは、従来の燃料噴射制御
システムと同じである。The engine 1 is additionally provided with an engine temperature sensor 31 for detecting its temperature, generally the temperature of cooling water, and a rotation speed sensor 32 for detecting the rotation speed, and in addition to these, it is installed in the exhaust pipe line 6. The state of the engine 1 such as an oxygen sensor that detects the exhaust state, an air flow rate sensor that is installed on the upstream side of the throttle valve 4 of the intake pipe line 2 to detect the intake air amount, and a throttle opening sensor that detects the position of the throttle valve 4 Sensors for detection are installed, and the values detected by these sensors are sent to the electronic control unit 8 and the liquid phase injection valve 18,
Controlling the gas-phase injection valve 27 is the same as the conventional fuel injection control system.
【００３０】本実施の形態では、エンジン温度センサ３
１，回転速度センサ３２に加えて、燃料タンク７にその
内部に充填されているＬＰＧの温度を検知するタンク温
度センサ３３を設置している。また、気相圧力調整器２
４はエンジン冷却水で加熱するようになっており、温度
が低下しても気相を維持して気相噴射弁２７から噴射さ
せることができる。In the present embodiment, the engine temperature sensor 3
1, in addition to the rotation speed sensor 32, a tank temperature sensor 33 that detects the temperature of the LPG filled in the fuel tank 7 is installed. In addition, the vapor pressure regulator 2
No. 4 is heated by engine cooling water, and can maintain the gas phase and inject it from the gas phase injection valve 27 even if the temperature decreases.
【００３１】電子式制御ユニット８にはＬＰＧの成分、
具体的には図２に示す圧力−温度線図で表されるプロパ
ン成分比に応じた圧力と温度との関係が記憶させてあ
り、また通常の空燃比制御のためのコントロール変数入
力・演算処理・コントロール信号出力手段のほかに、Ｌ
ＰＧ成分計算手段３５，液相状態判定手段３６，始動燃
料選定手段３７，切換指令手段３８，遅延時間設定手段
３９が含まれている。The electronic control unit 8 has LPG components,
Specifically, the relationship between pressure and temperature according to the propane component ratio represented by the pressure-temperature diagram shown in FIG. 2 is stored, and control variable input / arithmetic processing for normal air-fuel ratio control is stored. .In addition to the control signal output means, L
PG component calculation means 35, liquid phase state determination means 36, starting fuel selection means 37, switching command means 38, delay time setting means 39 are included.
【００３２】通常のエンジン運転において、液相燃料系
ＦＬによる燃料供給を行なっているときは液相圧力セン
サ１５，液相温度センサ１６が検出した液相ＬＰＧの状
態とエンジン１の運転状態とに応じて液相噴射弁１８を
制御し、気相燃料系ＦＧによる燃料供給を行なっている
ときは気相圧力センサ２５，気相温度センサ２６が検出
した気相ＬＰＧの状態とエンジン１の運転状態に応じて
気相噴射弁２７を制御する。In normal engine operation, when fuel is being supplied by the liquid phase fuel system FL, the state of the liquid phase LPG detected by the liquid phase pressure sensor 15 and the liquid phase temperature sensor 16 and the operating state of the engine 1 are determined. Accordingly, when the liquid phase injection valve 18 is controlled to supply fuel by the gas phase fuel system FG, the state of the gas phase LPG detected by the gas phase pressure sensor 25 and the gas phase temperature sensor 26 and the operating state of the engine 1 The gas-phase injection valve 27 is controlled according to the above.
【００３３】本実施の形態によると、タンク温度センサ
３３と気相圧力センサ２５または液相圧力センサ１５と
が検出した値に基いて、現在燃料タンク７に充填されて
いるＬＰＧの成分比、本実施の形態ではプロパン成分比
をＬＰＧ成分計算手段３５により算出する。この成分比
は図２に示す圧力−温度の関係から正確に算出すること
ができる。According to the present embodiment, based on the values detected by the tank temperature sensor 33 and the gas pressure sensor 25 or the liquid pressure sensor 15, the component ratio of the LPG currently filled in the fuel tank 7, In the embodiment, the propane component ratio is calculated by the LPG component calculation means 35. This component ratio can be accurately calculated from the pressure-temperature relationship shown in FIG.
【００３４】そして、算出されたＬＰＧの成分比と液相
圧力センサ１５，液相温度センサ１６が検出した液相燃
料系ＦＬ内の圧力および温度とを用いて、液相状態判定
手段３６により液相燃料系ＦＬ内の液相ＬＰＧの状態、
即ち完全な液相であるか気相を発生しているかを判断さ
せる。この場合、成分比によって一定の圧力−温度関係
を有しているので、検出した圧力および温度の値がこの
関係から逸脱していれば気相を発生している、と判断さ
れて液相燃料系ＦＬによる燃料供給を停止して気相燃料
系ＦＧによる燃料供給に切換える。Then, by using the calculated LPG component ratio and the pressure and temperature in the liquid-phase fuel system FL detected by the liquid-phase pressure sensor 15 and the liquid-phase temperature sensor 16, the liquid-phase state determination means 36 determines the liquid state. Of the liquid phase LPG in the phase fuel system FL,
That is, it is determined whether the liquid phase is complete or the gas phase is generated. In this case, since there is a constant pressure-temperature relationship depending on the component ratio, if the detected pressure and temperature values deviate from this relationship, it is determined that a gas phase is occurring, and the liquid-phase fuel is determined. The fuel supply by the system FL is stopped and switched to the fuel supply by the gas phase fuel system FG.
【００３５】以上は請求項１に記載した第一手段の実施
の形態であり、現在使用しているＬＰＧの組成を液相燃
料系ＦＬ内の液相ＬＰＧの状態判断の要素に加えたこと
により、ＬＰＧの成分比の相違による判断誤差がなくな
り、正確且つ高精度の制御が可能となって、気相発生後
も液相燃料系ＦＬによる燃料供給を継続して混合気過薄
を生じる、という不都合をなくし広範囲の運転条件下で
安定したエンジン性能を得ることができる。The above is the embodiment of the first means described in claim 1, and the composition of the LPG currently used is added to the element for judging the state of the liquid phase LPG in the liquid phase fuel system FL. , The judgment error due to the difference in the component ratio of the LPG is eliminated, and accurate and highly accurate control is possible, and the fuel supply by the liquid-phase fuel system FL is continued even after the gas phase is generated, and the mixture leans. It is possible to eliminate inconvenience and obtain stable engine performance under a wide range of operating conditions.
【００３６】次に、エンジン始動にあたって、ＬＰＧ成
分計算手段３５により算出されたＬＰＧの成分比とエン
ジン温度センサ３１が検出したエンジン温度とを用い
て、始動燃料選定手段３７により液相ＬＰＧと気相ＬＰ
Ｇのいずれによって始動させるかを選択する。即ち、図
３に示すようにエンジン温度が基準温度ＴＥよりも低い
ときは液相燃料系ＦＬから供給される液相ＬＰＧで始動
させ、エンジン温度が基準温度ＴＥよりも高いときは気
相燃料系ＦＧから供給される気相ＬＰＧで始動させるも
のである。このことにより、液相ＬＰＧが気化しにくい
低温域で液相ＬＰＧが供給され、あらゆる環境条件下で
常にエンジン１を容易に且つ安定よく始動させることが
可能となる。尚、エンジン始動後は液相状態判定手段３
６の判断に従った燃料供給が行なわれる。Next, when starting the engine, the starting fuel selecting means 37 uses the LPG component ratio calculated by the LPG component calculating means 35 and the engine temperature detected by the engine temperature sensor 31, and the liquid phase LPG and the gas phase. LP
Select G to start. That is, as shown in FIG. 3, when the engine temperature is lower than the reference temperature TE, the engine is started by the liquid phase LPG supplied from the liquid phase fuel system FL, and when the engine temperature is higher than the reference temperature TE, the gas phase fuel system is started. It is started by the gas phase LPG supplied from the FG. As a result, the liquid phase LPG is supplied in a low temperature range in which the liquid phase LPG is less likely to be vaporized, and the engine 1 can always be started easily and stably under all environmental conditions. In addition, after the engine is started, the liquid phase state determination means 3
Fuel supply is performed according to the judgment of 6.
【００３７】本実施の形態では基準温度ＴＥをＬＰＧの
成分比に応じて可変としている。即ち、図４に示すよう
にＬＰＧ成分計算手段３５によって算出したＬＰＧ成分
比の内でプロパンが占める比率が高いほど基準温度ＴＥ
を低温側へ移行させて気相ＬＰＧによる始動温度領域を
拡張する。反対に、プロパンが占める比率が低いほど基
準温度ＴＥを高温側に移行させて液相ＬＰＧによる始動
温度領域を拡張する。In the present embodiment, the reference temperature TE is variable according to the LPG component ratio. That is, as shown in FIG. 4, the higher the ratio of propane in the LPG component ratio calculated by the LPG component calculating means 35, the higher the reference temperature TE.
To a low temperature side to expand the starting temperature region by the vapor phase LPG. On the contrary, as the proportion of propane is lower, the reference temperature TE is shifted to the higher temperature side to extend the starting temperature region by the liquid phase LPG.
【００３８】以上は請求項２，６に記載した第二手段の
実施の形態であり、ＬＰＧ成分比による蒸気圧の相違に
応じて基準温度ＴＥを変更することにより、エンジン１
の始動性を更に高めることができる。The above is the embodiment of the second means described in claims 2 and 6, and the engine 1 is changed by changing the reference temperature TE according to the difference in vapor pressure due to the LPG component ratio.
It is possible to further improve the startability of the.
【００３９】エンジン１が長時間運転を続けたときや高
温雰囲気で運転されたとき、エンジン１の周辺が高温と
なってこれにより熱せられた余剰液相ＬＰＧが液相戻し
通路１９を通って燃料タンク７に戻り、これが循環する
ことによって燃料タンク７の温度が次第に上昇する。燃
料タンク７の温度が上昇すると、充填されているＬＰＧ
の気化が進んで圧力が大幅に上昇する。When the engine 1 continues to operate for a long time or is operated in a high temperature atmosphere, the temperature around the engine 1 becomes high and the excess liquid phase LPG heated by the engine 1 passes through the liquid phase return passage 19 to pass the fuel. By returning to the tank 7 and circulating it, the temperature of the fuel tank 7 gradually rises. When the temperature of the fuel tank 7 rises, the filled LPG
Vaporization progresses and the pressure rises significantly.
【００４０】燃料タンク７の温度はタンク温度センサ３
３によって検出されており、図５に示すように予め設定
した基準温度ＴＦよりも低いときは液相燃料系ＦＬによ
る燃料供給を継続するが、基準温度ＴＦよりも高温とな
ったときは気相燃料系ＦＧによる燃料供給に切換える。
この切換えは切換指令手段３８がタンク温度センサ３３
によって検出された温度と基準温度ＴＦとを比較して指
令を発することによって行なわれ、液相状態判定手段３
６が液相燃料系ＦＬ内を完全な液相ＬＰＧと判断してい
ても、この判断よりも優先して切換えを強制的に行なう
ものとされている。The temperature of the fuel tank 7 is measured by the tank temperature sensor 3
3, the fuel supply by the liquid phase fuel system FL is continued when the temperature is lower than a preset reference temperature TF as shown in FIG. 5, but when the temperature is higher than the reference temperature TF, the gas phase is increased. The fuel supply is switched to the fuel system FG.
For this switching, the switching command means 38 is operated by the tank temperature sensor 33.
The liquid phase state determining means 3 is performed by comparing the temperature detected by the reference temperature TF with the reference temperature TF and issuing a command.
Even if 6 determines that the inside of the liquid-phase fuel system FL is a complete liquid-phase LPG, the switching is forcibly performed with priority over this determination.
【００４１】以上は請求項３に記載した第三手段の実施
の形態であり、燃料タンク７の気相ＬＰＧを消費するこ
とによって燃料タンク７の圧力が低下し、液相ＬＰＧの
蒸発量が大幅に増加して蒸発の際の気化潜熱による冷却
効果で燃料タンク７の温度が低下する。このように、燃
料タンク７の温度・圧力の上昇が抑制されることによっ
て、液相噴射弁１８，気相噴射弁２７に高い加工精度、
複雑な動作制御システムを必要としなくなるとともに、
液相燃料系ＦＬ、気相燃料系ＦＧの構成部品の耐圧強度
に対する要求を軽減することができ、更に燃料タンク７
にＬＰＧを補給するときの充填作業を容易に行なうこと
ができるものである。The above is the embodiment of the third means described in claim 3, wherein the pressure of the fuel tank 7 is lowered by consuming the gas phase LPG of the fuel tank 7, and the evaporation amount of the liquid phase LPG is greatly increased. The temperature of the fuel tank 7 decreases due to the cooling effect of the latent heat of vaporization during evaporation. In this way, by suppressing the temperature / pressure rise of the fuel tank 7, the liquid phase injection valve 18 and the gas phase injection valve 27 have high processing accuracy,
It eliminates the need for complicated motion control systems,
It is possible to reduce the requirements for the pressure resistance of the components of the liquid-phase fuel system FL and the vapor-phase fuel system FG, and further, the fuel tank 7
It is possible to easily perform the filling work when replenishing the LPG with.
【００４２】尚、燃料タンク７の温度が基準温度ＴＦよ
りも低下したときは、液相状態判定手段３６の判断に従
う燃料供給に戻る。尚また、この実施の形態における基
準温度ＴＦは一定値に固定しておいてもよいが、ＬＰＧ
の成分比に応じてプロパン比率が高いほど低温側へ移行
させ、気相ＬＰＧに切換える温度領域を拡張させるよう
にしてもよく、このようにすると燃料タンク７内の温度
・圧力の上昇を更に適切に抑制することができる。When the temperature of the fuel tank 7 becomes lower than the reference temperature TF, the fuel supply is returned according to the judgment of the liquid phase state judging means 36. Further, the reference temperature TF in this embodiment may be fixed to a constant value.
The higher the propane ratio, the higher the propane ratio, and the lower the temperature may be extended to expand the temperature range for switching to the gas phase LPG. Can be suppressed.
【００４３】更に、図１に示した実施の形態のように、
常用する液相燃料系ＦＬの液相噴射弁１８を吸気マニホ
ルド枝管毎にエンジン入口近くに設置し、特定条件で使
用する気相燃料系ＦＧの気相噴射弁２７を吸気マニホル
ド集合部に設置したものにおいて、液相燃料系ＦＬによ
る燃料供給の停止と気相燃料系ＦＧによる燃料供給の開
始とを同時に行なうと、気相噴射弁２７がエンジン１か
ら遠いために供給遅れを生じ、混合気が一時的に過薄と
なる。また、気相燃料系ＦＧによる燃料供給の停止と液
相燃料系ＦＬによる燃料供給の開始とを同時に行なう
と、液相噴射弁１８がエンジン１に近いために気相ＬＰ
Ｇと液相ＬＰＧとが同時に供給されて混合気を一時的に
過濃とする。Further, as in the embodiment shown in FIG.
A liquid-phase injection valve 18 of a liquid-phase fuel system FL that is normally used is installed near the engine inlet for each intake manifold branch pipe, and a gas-phase injection valve 27 of a gas-phase fuel system FG that is used under specific conditions is installed in an intake manifold collecting portion. If the fuel supply by the liquid-phase fuel system FL and the fuel supply by the gas-phase fuel system FG are started at the same time, the gas-phase injection valve 27 is far from the engine 1 and a supply delay occurs, resulting in a mixture. Becomes temporarily thin. Further, when the fuel supply by the gas-phase fuel system FG and the fuel supply by the liquid-phase fuel system FL are simultaneously started, the liquid-phase injection valve 18 is close to the engine 1, and therefore the gas-phase LP
G and liquid-phase LPG are simultaneously supplied to temporarily make the mixture rich.
【００４４】図６（Ｂ）はこの様子を示したものであ
り、切換え時に空燃比がスパイクを発生してエンジン運
転性、排気状態を悪化する、という不都合を生じる。FIG. 6 (B) shows this situation, which causes a disadvantage that the air-fuel ratio causes a spike at the time of switching to deteriorate the engine operability and the exhaust state.
【００４５】そこで、液相状態判定手段３６および切換
指令手段３８が発する指令により切換えを行なうとき、
回転速度センサ３２が検出した値に基いて遅延時間設定
手段３９により液相燃料系ＦＬの燃料供給停止・開始時
期を気相燃料系ＦＧの燃料供給開始・停止時期よりも遅
らせる時間を設定し、この設定された遅延時間に従って
液相燃料系ＦＬの燃料供給停止と開始とを遅らせるもの
とした。Therefore, when switching is performed by the command issued by the liquid phase state judging means 36 and the switching command means 38,
Based on the value detected by the rotation speed sensor 32, the delay time setting means 39 sets a time for delaying the fuel supply stop / start timing of the liquid phase fuel system FL before the fuel supply start / stop timing of the gas phase fuel system FG, The fuel supply stop and start of the liquid phase fuel system FL are delayed according to the set delay time.
【００４６】即ち、液相燃料系ＦＬから気相燃料系ＦＧ
に切換えるときは、気相燃料系ＦＧによる燃料供給の開
始から少し遅れて液相燃料系ＦＬによる燃料供給を停止
させることにより、燃料を途切れることなくエンジン１
に供給することができる。また、気相燃料系ＦＧから液
相燃料系ＦＬに切換えるときは、気相燃料系ＦＧによる
燃料供給の停止から少し遅れて液相燃料系ＦＬによる燃
料供給を開始させることにより、これらからの燃料を重
複させることなくエンジン１に供給することができる。That is, from the liquid phase fuel system FL to the gas phase fuel system FG
When switching to, the fuel supply by the liquid-phase fuel system FL is stopped a little later than the start of the fuel supply by the gas-phase fuel system FG, so that the fuel is not interrupted.
Can be supplied to. Further, when switching from the gas-phase fuel system FG to the liquid-phase fuel system FL, the fuel supply from the liquid-phase fuel system FL is started with a slight delay after the stop of the fuel supply from the gas-phase fuel system FG. Can be supplied to the engine 1 without overlapping.
【００４７】尚、遅延時間設定手段３９で遅延時間を設
定するにあたり、図７に示すようにエンジン回転速度が
高いほど遅延時間を短く設定することが、回転速度の高
低にかかわらず燃料の途切れおよび重複を生じさせない
ために有効である。In setting the delay time by the delay time setting means 39, it is preferable to set the delay time shorter as the engine rotation speed becomes higher as shown in FIG. 7, regardless of whether the rotation speed is high or low. It is effective to prevent duplication.
【００４８】以上は請求項４，７に記載した第四手段の
実施の形態であり、図６（Ａ）に示したように切換え時
における空燃比スパイクの発生がなくなり、一定空燃比
の混合気をエンジン１に供給して運転性、排気状態を良
好に維持することができる。The above is the embodiment of the fourth means described in claims 4 and 7, and as shown in FIG. 6 (A), the occurrence of the air-fuel ratio spike at the time of switching is eliminated, and the air-fuel mixture having a constant air-fuel ratio is eliminated. Can be supplied to the engine 1 to maintain good drivability and exhaust conditions.
【００４９】[0049]
【発明の効果】以上のように、燃料タンクのＬＰＧの液
相部分を吸気管路に噴射する液相燃料系と、特定条件下
で気相部分を吸気管路に噴射する気相燃料系とを具えた
ＬＰＧ噴射システムにおいて、各燃料系内のＬＰＧの圧
力および温度を検知することに加えて、燃料タンクの温
度を検知して使用しているＬＰＧの成分比を算出し、こ
れを基準として液相燃料系内の液相ＬＰＧが完全な液相
であるか気相を発生しているかを判断するようにした本
発明によると、組成が異なるＬＰＧを用いても常に完全
な液相ＬＰＧまたは気相ＬＰＧを噴射させることがで
き、正確な制御を行なって広範囲の運転条件下で安定し
たエンジン性能を得ることができるものである。As described above, the liquid-phase fuel system that injects the liquid-phase portion of the LPG of the fuel tank into the intake pipe line and the gas-phase fuel system that injects the gas-phase portion into the intake pipe line under specific conditions. In addition to detecting the pressure and temperature of the LPG in each fuel system in the LPG injection system equipped with, the temperature of the fuel tank is detected and the component ratio of the LPG used is calculated. According to the present invention, which determines whether the liquid phase LPG in the liquid phase fuel system is a complete liquid phase or a gas phase, the complete liquid phase LPG or the LPG having a different composition is always used. It is possible to inject the gas phase LPG, perform accurate control, and obtain stable engine performance under a wide range of operating conditions.
【００５０】また、このことにエンジン温度とＬＰＧ成
分比とに基いて始動燃料を選定する手段、燃料タンクの
温度に基いて液相燃料系による燃料供給を気相燃料系に
よる燃料供給に強制的に切換える手段、エンジン回転速
度に応じた時間だけ燃料切換え時の液相燃料系の供給停
止・開始を気相燃料系の供給開始・停止よりも遅延させ
る手段、のいずれかまたは二以上を加えた本発明による
と、エンジンの始動を容易且つ安定よく行なうこと、燃
料タンクの温度・圧力上昇を抑制して噴射弁、制御シス
テム、各部品に対する諸要求を軽減すること、切換え時
の燃料引継ぎを途切れや重複を生じることなく円滑に行
なってエンジン運転性、排気状態を損なわないこと、が
できるものである。In addition, the means for selecting the starting fuel based on the engine temperature and the LPG component ratio, and the fuel supply by the liquid phase fuel system is forced to the fuel supply by the gas phase fuel system based on the temperature of the fuel tank. Or a means for delaying the supply stop / start of the liquid phase fuel system at the time of fuel change for a time period depending on the engine speed, compared with the start / stop of the supply of the gas phase fuel system. According to the present invention, the engine can be started easily and stably, the temperature and pressure rise of the fuel tank can be suppressed to reduce the requirements for the injection valve, the control system, and each component, and the fuel transfer at the time of switching can be interrupted. It is possible to smoothly carry out the engine operation and the exhaust state without degrading or overlapping.
【図１】本発明の実施の形態を示す配置図。FIG. 1 is a layout view showing an embodiment of the present invention.
【図２】ＬＰＧの圧力−温度線図。FIG. 2 is a pressure-temperature diagram of LPG.
【図３】エンジン温度による始動燃料選択を説明する
図。FIG. 3 is a diagram for explaining starting fuel selection based on engine temperature.
【図４】始動燃料選択のエンジン基準温度とＬＰＧ成分
比との関係を示す図。FIG. 4 is a diagram showing a relationship between an engine reference temperature for starting fuel selection and an LPG component ratio.
【図５】燃料タンク温度による使用燃料切換えを説明す
る図。FIG. 5 is a diagram illustrating switching of used fuel depending on a fuel tank temperature.
【図６】液相ＬＰＧと気相ＬＰＧの切換えと空燃比との
関連を説明する図。FIG. 6 is a diagram for explaining the relationship between switching between liquid-phase LPG and gas-phase LPG and the air-fuel ratio.
【図７】燃料切換えの遅延時間設定とエンジン回転速度
との関係を示す図。FIG. 7 is a diagram showing a relationship between a fuel switching delay time setting and an engine rotation speed.
【図８】従来例の概略配置図。FIG. 8 is a schematic layout diagram of a conventional example.
【図９】異なる従来例の概略配置図。FIG. 9 is a schematic layout diagram of a different conventional example.
１ エンジン，２ 吸気管路，７ 燃料タンク，８ 電
子式制御ユニット，１１ 液相燃料通路，１５ 液相圧
力センサ，１６ 液相温度センサ，１８ 液相噴射弁，
２２ 気相燃料通路，２５ 気相圧力センサ，２６ 気
相温度センサ，２７ 気相噴射弁，３１ エンジン温度
センサ，３２ 回転速度センサ，３３タンク温度セン
サ，３５ ＬＰＧ成分計算手段，３６ 液相状態判定手
段，３７始動燃料選定手段，３８ 切換指令手段，３９
遅延時間設定手段，ＦＬ 液相燃料系，ＦＧ 気相燃
料系，1 engine, 2 intake lines, 7 fuel tank, 8 electronic control unit, 11 liquid phase fuel passage, 15 liquid phase pressure sensor, 16 liquid phase temperature sensor, 18 liquid phase injection valve,
22 gas-phase fuel passage, 25 gas-phase pressure sensor, 26 gas-phase temperature sensor, 27 gas-phase injection valve, 31 engine temperature sensor, 32 rotational speed sensor, 33 tank temperature sensor, 35 LPG component calculation means, 36 liquid-phase state determination Means, 37 starting fuel selecting means, 38 switching command means, 39
Delay time setting means, FL liquid phase fuel system, FG gas phase fuel system,
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０２Ｄ 45/00 ３１０ Ｆ０２Ｄ 45/00 ３１０Ｂ ３１０Ｑ ３１０Ｚ ３６０ ３６０Ａ ３６４ ３６４Ｋ Ｆ０２Ｍ 21/02 Ｆ０２Ｍ 21/02 Ｌ Ｒ ３０１ ３０１Ｌ 37/00 37/00 Ｎ 69/00 69/00 ３５０Ｐ (72)発明者 津坂 智 神奈川県厚木市上依知3029番地 株式会社 ニッキ内 (72)発明者 山口 真也 神奈川県厚木市上依知3029番地 株式会社 ニッキ内 (72)発明者 田沼 正義 神奈川県厚木市上依知3029番地 株式会社 ニッキ内 (72)発明者 瀧川 武相 神奈川県厚木市上依知3029番地 株式会社 ニッキ内 Ｆターム(参考） 3G084 AA05 BA11 CA01 DA11 DA34 FA07 FA10 FA14 FA20 FA33 3G092 AA08 AB06 BA04 BB01 BB08 DE11S DE14S DF09 EC01 FA05 FA06 HB01X HB03Z HB04Z HB05Z HB09Z 3G301 HA22 JA04 LB01 MA01 MA11 ND01 PB01Z PB02Z PB03A PB08Z PE01Z PE08Z ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) F02D 45/00 310 F02D 45/00 310B 310Q 310Z 360 360A 364 364K F02M 21/02 F02M 21/02 L R 301 301L 37/00 37/00 N 69/00 69/00 350P (72) Inventor Satoshi Tsuzaka 3029 Kamiichi, Atsugi City, Kanagawa Prefecture Nikki Co., Ltd. (72) Inventor Shinya Yamaguchi 3029 Kamiichi, Atsugi City, Kanagawa Nikki Corporation (72) Inventor Masayoshi Tanuma 3029 Kamiyori, Atsugi, Kanagawa Nikki Co., Ltd. (72) Inventor Takezo Takigawa 3029 Kamiyori, Atsugi, Kanagawa F Term (reference) 3G084 AA05 BA11 CA01 DA11 DA34 FA07 FA10 FA14 FA20 FA33 3G092 AA08 AB06 BA04 BB01 BB08 DE11S DE14S DF09 E C01 FA05 FA06 HB01X HB03Z HB04Z HB05Z HB09Z 3G301 HA22 JA04 LB01 MA01 MA11 ND01 PB01Z PB02Z PB03A PB08Z PE01Z PE08Z
Claims (7)
相部分と気相部分とのいずれかを選択して吸気管路に噴
射しエンジンに供給する液相燃料系と気相燃料系とを有
するものであって、 前記燃料タンクに設置されてその温度を検出するタンク
温度センサと、 前記液相燃料系の前記燃料タンクから液相噴射弁に至る
液相燃料通路に設置されてその内部の液相ＬＰＧの圧力
および温度を検出する液相圧力センサおよび液相温度セ
ンサと、 前記気相燃料系の前記燃料タンクから気相噴射弁に至る
気相燃料通路に設置されてその内部の気相ＬＰＧの圧力
および温度を検出する気相圧力センサおよび気相温度セ
ンサと、 前記タンク温度センサと前記気相圧力センサまたは液相
圧力センサとが検出した各値に基いてＬＰＧの成分比を
算出するＬＰＧ成分計算手段と、 前記ＬＰＧ成分計算手段により算出された成分比を基準
として、前記液相圧力センサおよび液相温度センサが検
出した各値から前記液相燃料系内の液相ＬＰＧの状態を
判断する液相状態判定手段と、 を具え、前記液相状態判定手段が前記液相燃料系内の液
相ＬＰＧを完全な液相と判断したときは前記液相燃料系
による燃料供給を行なわせ、前記液相燃料系内に気相を
発生していると判断したときは前記気相燃料系による燃
料供給を行なわせるようにした、 ことを特徴とするエンジンのＬＰＧ供給装置。1. A liquid-phase fuel system and a gas-phase fuel system for selecting either a liquid-phase portion or a vapor-phase portion of LPG filled in a fuel tank and injecting it into an intake pipe to supply it to an engine. A tank temperature sensor installed in the fuel tank to detect its temperature; and a liquid phase fuel passage extending from the fuel tank of the liquid phase fuel system to the liquid phase injection valve, and A liquid-phase pressure sensor and a liquid-phase temperature sensor for detecting the pressure and temperature of the liquid-phase LPG, and a gas phase inside the gas-phase fuel passage extending from the fuel tank of the gas-phase fuel system to a gas-phase injection valve. The component ratio of LPG is calculated based on the values detected by the gas phase pressure sensor and the gas phase temperature sensor that detect the pressure and temperature of the LPG, and the tank temperature sensor and the gas phase pressure sensor or the liquid phase pressure sensor. LPG success The state of the liquid-phase LPG in the liquid-phase fuel system is judged from the values detected by the liquid-phase pressure sensor and the liquid-phase temperature sensor with reference to the component ratio calculated by the calculating unit and the LPG component calculating unit. Liquid phase state determination means, and when the liquid phase state determination means determines that the liquid phase LPG in the liquid phase fuel system is a complete liquid phase, fuel is supplied by the liquid phase fuel system, An LPG supply device for an engine, characterized in that, when it is determined that a gas phase is generated in the liquid phase fuel system, the fuel is supplied by the gas phase fuel system.
給装置において、 エンジンの温度を検出するエンジン温度センサと、 前記ＬＰＧ成分計算手段により算出されたＬＰＧ成分比
および前記エンジン温度センサが検出した値に基いてエ
ンジンの始動時に供給する燃料を選定する始動燃料選定
手段と、 を具え、前記始動燃料選定手段は始動時のエンジン温度
が基準温度よりも低温のとき前記液相燃料系に始動燃料
供給を行なわせ、高温のとき前記気相燃料系に始動燃料
供給を行なわせるものとした、 ことを特徴とするエンジンのＬＰＧ供給装置。2. The engine LPG supply device according to claim 1, wherein an engine temperature sensor for detecting an engine temperature, an LPG component ratio calculated by the LPG component calculation means, and a value detected by the engine temperature sensor. Starting fuel selection means for selecting the fuel to be supplied at the time of starting the engine based on the above, and the starting fuel selection means supplies the starting fuel to the liquid phase fuel system when the engine temperature at the time of starting is lower than a reference temperature. And a starting fuel supply to the vapor-phase fuel system when the temperature is high.
ＬＰＧ供給装置において、 前記タンク温度センサが検出した値に基いて燃料の切換
えを行なわせる切換指令手段、 を具え、前記切換指令手段は前記燃料タンクが設定温度
以上となったとき、前記液相状態判定手段が前記液相燃
料系による燃料供給を行なわせる判断をしていても、気
相燃料系による燃料供給に切換えさせるようにした、 ことを特徴とするエンジンのＬＰＧ供給装置。3. The engine LPG supply device according to claim 1 or 2, further comprising: switching command means for switching fuel based on a value detected by the tank temperature sensor, the switching command means comprising: When the temperature of the fuel tank becomes equal to or higher than the set temperature, even if the liquid phase state determination means determines to supply the fuel by the liquid phase fuel system, the fuel supply is switched to the fuel supply by the gas phase fuel system. An LPG supply device for an engine, characterized in that
ンのＬＰＧ供給装置において、 エンジンの回転速度を検出する回転速度センサと、 前記回転速度センサが検出した値に応じて燃料切換え時
における前記液相燃料系の燃料供給停止・開始時期を前
記気相燃料系の燃料供給開始・停止時期よりも遅らせる
時間を設定する遅延時間設定手段と、 を具え、前記遅延時間設定手段は前記液相燃料系から気
相燃料系への切換え時に後者の燃料供給開始時点から設
定された時間だけ遅れて前者の燃料供給を停止させ、前
記気相燃料系から液相燃料系への切換え時に前者の燃料
供給停止時点から設定された時間だけ遅れて後者の燃料
供給を開始させるようにした、 ことを特徴とするエンジンのＬＰＧ供給装置。4. The LPG supply device for an engine according to claim 1, 2, or 3, wherein a rotation speed sensor for detecting a rotation speed of the engine, and the fuel supply switching device according to a value detected by the rotation speed sensor. Delay time setting means for setting a time for delaying the fuel supply stop / start timing of the liquid phase fuel system relative to the fuel supply start / stop timing of the gas phase fuel system, the delay time setting means comprising: When the system is switched to the gas phase fuel system, the former fuel supply is stopped with a delay of a set time from the latter fuel supply start time, and the former fuel supply is carried out when the gas phase fuel system is switched to the liquid phase fuel system. An LPG supply device for an engine, characterized in that the latter fuel supply is started with a delay of a set time from the stop time.
の各気筒に対応して前記吸気管路の吸気マニホルド枝管
のそれぞれに設置され、前記気相燃料系の気相噴射弁は
一個であって前記吸気管路の吸気マニホルド集合部また
はそれよりも上流側に設置されている請求項１，２，３
または４に記載したエンジンのＬＰＧ供給装置。5. The liquid phase injection valve of the liquid phase fuel system is installed in each of the intake manifold branch pipes of the intake pipe line corresponding to each cylinder of the engine, and the gas phase injection valve of the gas phase fuel system is A single piece, which is installed on the intake manifold collecting portion of the intake pipe or on the upstream side of the intake manifold collecting portion.
Or the LPG supply device for the engine described in 4.
ン比率が高いほど前記基準温度を低温側に移行させて前
記気相燃料系による始動燃料供給温度領域を拡張するよ
うにされている請求項２，３または４に記載したエンジ
ンのＬＰＧ供給装置。6. The starting fuel selection means is configured to shift the reference temperature to a lower temperature side as the propane ratio of LPG is higher to extend the starting fuel supply temperature range by the gas phase fuel system. LPG supply device for the engine described in 3 or 4 above.
速度が高いほど遅延させる時間を短く設定するようにさ
れている請求項４に記載したエンジンのＬＰＧ供給装
置。7. The LPG supply device for an engine according to claim 4, wherein the delay time setting means sets a shorter delay time as the engine speed increases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002035085A JP3830826B2 (en) | 2002-02-13 | 2002-02-13 | Engine LPG supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002035085A JP3830826B2 (en) | 2002-02-13 | 2002-02-13 | Engine LPG supply device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006129004A Division JP2006250149A (en) | 2006-05-08 | 2006-05-08 | Lpg supply device for engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003239785A true JP2003239785A (en) | 2003-08-27 |
| JP3830826B2 JP3830826B2 (en) | 2006-10-11 |
Family
ID=27777378
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002035085A Expired - Fee Related JP3830826B2 (en) | 2002-02-13 | 2002-02-13 | Engine LPG supply device |
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| Country | Link |
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| JP (1) | JP3830826B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100569423B1 (en) | 2004-03-25 | 2006-04-07 | 현대자동차주식회사 | Fuel state diagnosis apparatus in LPI engine |
| KR100671127B1 (en) | 2004-09-25 | 2007-01-17 | 르노삼성자동차 주식회사 | Method of Fuel supply apparatus for LPG Liquid Injection system |
| JP2007085295A (en) * | 2005-09-26 | 2007-04-05 | Mazda Motor Corp | Fuel switching control device of dual-fuel engine |
| JP2008248793A (en) * | 2007-03-30 | 2008-10-16 | Mitsui Eng & Shipbuild Co Ltd | Engine system |
| EP1849988A3 (en) * | 2006-04-26 | 2010-03-10 | M.T.M. S.r.l. | Method and group for the LPG feeding of an internal combustion engine |
| CN109268164A (en) * | 2018-07-24 | 2019-01-25 | 哈尔滨工程大学 | A kind of natural gas engine burning tissues method and device |
| US10619599B1 (en) * | 2014-05-28 | 2020-04-14 | Econtrols, Llc | Two-phase LPG fuel supply |
-
2002
- 2002-02-13 JP JP2002035085A patent/JP3830826B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100569423B1 (en) | 2004-03-25 | 2006-04-07 | 현대자동차주식회사 | Fuel state diagnosis apparatus in LPI engine |
| KR100671127B1 (en) | 2004-09-25 | 2007-01-17 | 르노삼성자동차 주식회사 | Method of Fuel supply apparatus for LPG Liquid Injection system |
| JP2007085295A (en) * | 2005-09-26 | 2007-04-05 | Mazda Motor Corp | Fuel switching control device of dual-fuel engine |
| JP4600231B2 (en) * | 2005-09-26 | 2010-12-15 | マツダ株式会社 | Dual fuel engine fuel switching control device |
| EP1849988A3 (en) * | 2006-04-26 | 2010-03-10 | M.T.M. S.r.l. | Method and group for the LPG feeding of an internal combustion engine |
| US7870849B2 (en) | 2006-04-26 | 2011-01-18 | M.T.M.-S.r.l. | Method and group for the LPG feeding of an internal combustion engine |
| JP2008248793A (en) * | 2007-03-30 | 2008-10-16 | Mitsui Eng & Shipbuild Co Ltd | Engine system |
| US10619599B1 (en) * | 2014-05-28 | 2020-04-14 | Econtrols, Llc | Two-phase LPG fuel supply |
| CN109268164A (en) * | 2018-07-24 | 2019-01-25 | 哈尔滨工程大学 | A kind of natural gas engine burning tissues method and device |
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| Publication number | Publication date |
|---|---|
| JP3830826B2 (en) | 2006-10-11 |
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