JP2002317665A - Fuel supply device of internal combustion engine using liquefied petroleum gas - Google Patents

Fuel supply device of internal combustion engine using liquefied petroleum gas

Info

Publication number
JP2002317665A
JP2002317665A JP2001120030A JP2001120030A JP2002317665A JP 2002317665 A JP2002317665 A JP 2002317665A JP 2001120030 A JP2001120030 A JP 2001120030A JP 2001120030 A JP2001120030 A JP 2001120030A JP 2002317665 A JP2002317665 A JP 2002317665A
Authority
JP
Japan
Prior art keywords
fuel
temperature
pressure
combustion engine
internal combustion
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
Application number
JP2001120030A
Other languages
Japanese (ja)
Other versions
JP3971121B2 (en
Inventor
Mutsumi Tsujino
睦 辻野
Toru Sato
佐藤　　亨
Fusaji Omura
房治 大村
Masaharu Wakabayashi
正晴 若林
Kenji Hayashi
憲示 林
Toshishige Saiki
利成 斉木
Toshihiro Kawai
利浩 河合
Jun Yamada
潤 山田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisan Industry Co Ltd
Toyota Motor Corp
Soken Inc
Original Assignee
Aisan Industry Co Ltd
Nippon Soken Inc
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aisan Industry Co Ltd, Nippon Soken Inc, Toyota Motor Corp filed Critical Aisan Industry Co Ltd
Priority to JP2001120030A priority Critical patent/JP3971121B2/en
Publication of JP2002317665A publication Critical patent/JP2002317665A/en
Application granted granted Critical
Publication of JP3971121B2 publication Critical patent/JP3971121B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply device for a liquefied petroleum gas internal combustion engine capable of lessening the sensing error of the fuel composition even at a low temperature and of correcting accurately the fuel amount to be injected into the engine. SOLUTION: The fuel supply device of the liquefied petroleum gas internal combustion engine is equipped with a temperature sensing means to sense the internal temperature of a fuel tank, a pressure sensing means to sense the internal pressure of the tank, a fuel amount sensing means to sense the fuel amount in the tank, a memory means and a control means, wherein the control means corrects the fuel amount to be injected into the engine in accordance with the fuel composition determined on the basis of the sensed temperature and pressure in case the sensed temperature is over the specified level, and in the opposite case, corrects the fuel amount to be injected in accordance with the fuel composition determined on the basis of the sensed temperature, pressure, and fuel amount given in the above case and the latest fuel amount.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、液化石油ガス内燃
機関に燃料を供給する燃料供給装置に関する。The present invention relates to a fuel supply device for supplying fuel to a liquefied petroleum gas internal combustion engine.

【０００２】[0002]

【従来の技術】従来、燃料として液化石油ガス（ＬＰ
Ｇ）を用いる内燃機関では、液相状態の燃料（ＬＰＧ）
をインジェクタから各気筒に噴射して気相状態の燃料に
する。燃料（ＬＰＧ）は、常温常圧では気相状態である
が、密閉された燃料タンク内に液相状態の燃料が貯蔵さ
れると一部の燃料は気化する。そして燃料タンク内に
は、液相状態の燃料と気相状態の燃料が保持される。内
燃機関の運転時、燃料タンク内の液相状態の燃料は、燃
料ポンプで燃料配管を介してデリバリ配管に供給され
る。そして、デリバリ配管に供給された液相燃料は、イ
ンジュクタを介して内燃機関の各気筒に噴射され、気相
燃料となる。燃料は、インジェクタまで液相状態が維持
され、インジェクタから内燃機関に噴射された時に、す
べて気相状態になることが好ましい。2. Description of the Related Art Conventionally, liquefied petroleum gas (LP) has been used as fuel.
In the internal combustion engine using G), liquid-phase fuel (LPG)
Is injected into each cylinder from an injector to produce fuel in a gaseous state. Fuel (LPG) is in a gas phase at normal temperature and normal pressure, but when fuel in a liquid phase is stored in a closed fuel tank, a part of the fuel is vaporized. The fuel in the liquid tank and the fuel in the gas phase are held in the fuel tank. During operation of the internal combustion engine, the fuel in the liquid phase in the fuel tank is supplied to the delivery pipe via the fuel pipe by the fuel pump. Then, the liquid-phase fuel supplied to the delivery pipe is injected into each cylinder of the internal combustion engine via an injector to become a gas-phase fuel. It is preferable that the fuel be kept in a liquid state up to the injector and be entirely in a gaseous state when injected from the injector to the internal combustion engine.

【０００３】ところで、燃料として用いられる液化石油
ガス（ＬＰＧ）は、プロパンとブタンの混合液化ガスで
ある。混合液化ガスは、燃料タンク内で沸点の低いプロ
パンが優先的に気化する。そのため、燃料が消費されて
燃料タンク内の液相燃料量が減少すると、プロパンが優
先的に気化していき、それに伴って液相燃料内のプロパ
ンの割合（燃料組成）も徐々に減少していく。このよう
に、混合液化ガスのプロパンとブタンの割合は、随時変
化していく。また、燃料タンクに充填された時点でも、
温度、圧力、保管状態等の影響で液相燃料内のプロパン
の割合（燃料組成）は、様々な割合となっている。[0003] Liquefied petroleum gas (LPG) used as fuel is a mixed liquefied gas of propane and butane. As for the mixed liquefied gas, propane having a low boiling point evaporates preferentially in the fuel tank. Therefore, when the fuel is consumed and the amount of liquid fuel in the fuel tank decreases, propane vaporizes preferentially, and the proportion of propane (fuel composition) in the liquid fuel gradually decreases accordingly. Go. Thus, the ratio of propane and butane in the mixed liquefied gas changes as needed. Also, even when the fuel tank is filled,
The ratio of propane (fuel composition) in the liquid phase fuel has various ratios due to the influence of temperature, pressure, storage conditions, and the like.

【０００４】また、インジュクタから各気筒に燃料を噴
射する場合、内燃機関が吸入した空気量と燃料量が最適
な割合になるよう調量される。この時、インジェクタか
ら噴射される燃料量は、インジュクタの開弁時間で制御
される。インジェクタの開弁時間は、内燃機関が吸入し
た空気量（空気質量）に対して必要な燃料量（燃料質
量）が最適な量となるよう、演算で求められる。ここ
で、必要な燃料量（燃料質量）は、混合液化ガスの量で
なく、混合液化ガス中のプロパン成分とブタン成分各々
の量である（プロパンとブタンでは質量当りの発熱量が
異なるため）。よって、随時変化する燃料組成に基づい
てインジェクタから噴射する燃料量を補正しなければ燃
料の不足等が発生し、内燃機関の燃焼が不安定になり、
始動性及び運転性の悪化、アイドル不安定等が発生する
ことも考えられる。そのため、混合液化ガス中のプロパ
ンの割合（燃料組成）を検出する装置が、種々開発され
てきた。例えば、特開昭５９−２０８１５２公報では、
始動前に、燃料タンク内の燃料温度と燃料圧力を検出し
て燃料組成を検出して記憶し、始動後は、記憶した燃料
組成と（現在の）燃料温度に基づいて液比重を算出し、
液比重と燃料圧力に基づいて燃料量を補正する燃料供給
装置が提案されている。When fuel is injected from the injector into each cylinder, the amount of air taken into the internal combustion engine and the amount of fuel are adjusted so as to have an optimal ratio. At this time, the amount of fuel injected from the injector is controlled by the valve opening time of the injector. The valve opening time of the injector is obtained by calculation so that the required amount of fuel (fuel mass) is optimal with respect to the amount of air (air mass) drawn by the internal combustion engine. Here, the required fuel amount (fuel mass) is not the amount of the mixed liquefied gas but the respective amounts of the propane component and the butane component in the mixed liquefied gas (because the calorific value per mass differs between propane and butane). . Therefore, if the fuel amount injected from the injector is not corrected based on the fuel composition that changes from time to time, a shortage of fuel or the like occurs, and the combustion of the internal combustion engine becomes unstable,
It is also conceivable that the startability and the drivability are deteriorated, and the idling is unstable. Therefore, various devices for detecting the proportion of propane (fuel composition) in the mixed liquefied gas have been developed. For example, in JP-A-59-208152,
Before the start, the fuel temperature and the fuel pressure in the fuel tank are detected and the fuel composition is detected and stored. After the start, the liquid specific gravity is calculated based on the stored fuel composition and the (current) fuel temperature,
2. Description of the Related Art A fuel supply device that corrects a fuel amount based on a liquid specific gravity and a fuel pressure has been proposed.

【０００５】[0005]

【発明が解決しようとする課題】しかし、従来の燃料供
給装置では、燃料組成を検出する始動前の温度が低い場
合（例えば、０℃以下）には、蒸気圧が低く圧力検出手
段での検出が困難、あるいは検出できても誤差が大きい
等、燃料組成を良好に検出できない可能性もある。この
ため、このような燃料組成に基づいて燃料量を補正した
場合は、内燃機関の燃焼が不安定になり、始動性及び運
転性の悪化、アイドル不安定等が発生することも考えら
れる。本発明は、このような点に鑑みて創案されたもの
であり、低温時であっても燃料組成の検出誤差を小さく
することができ、もって内燃機関に噴射する燃料量をよ
り正確に補正することができる液化石油ガス内燃機関の
燃料供給装置を提供することを目的とする。However, in the conventional fuel supply device, when the temperature before starting the fuel composition detection is low (for example, 0 ° C. or less), the vapor pressure is low and the detection by the pressure detection means is performed. However, there is also a possibility that the fuel composition cannot be detected satisfactorily, for example, it is difficult, or even if it can be detected, the error is large. For this reason, when the fuel amount is corrected based on such a fuel composition, the combustion of the internal combustion engine becomes unstable, and the startability and drivability may be degraded, and idling may be unstable. The present invention has been made in view of such a point, and it is possible to reduce a fuel composition detection error even at a low temperature, thereby more accurately correcting the amount of fuel injected into an internal combustion engine. It is an object of the present invention to provide a fuel supply device for a liquefied petroleum gas internal combustion engine that can perform the above-described operation.

【０００６】[0006]

【課題を解決するための手段】上記課題を解決するため
の本発明の第１発明は、請求項１に記載されたとおりの
液化石油ガス内燃機関の燃料供給装置である。請求項１
に記載の液化石油ガス内燃機関の燃料供給装置では、燃
料温度が高く検出誤差が小さい場合は、燃料温度と燃料
圧力に基づいて検出した燃料組成に応じて内燃機関に噴
射する燃料量を補正し、燃料温度が低く検出誤差が大き
い場合は、燃料温度が高い時の燃料温度と燃料圧力に基
づいて検出した燃料組成に応じて内燃機関に噴射する燃
料量を補正する。請求項１に記載の液化石油ガス内燃機
関の燃料供給装置を用いれば、検出誤差が大きい低温時
では、検出誤差の小さい高温時の燃料温度と燃料圧力に
基づいて検出した燃料組成に応じて燃料量を補正するこ
とで、燃料組成の検出誤差を小さくすることができ、よ
り正確に内燃機関に噴射する燃料量を補正できる。According to a first aspect of the present invention, there is provided a fuel supply apparatus for a liquefied petroleum gas internal combustion engine as set forth in claim 1. Claim 1
In the fuel supply device for a liquefied petroleum gas internal combustion engine described in the paragraph, when the fuel temperature is high and the detection error is small, the fuel amount injected to the internal combustion engine is corrected according to the fuel composition detected based on the fuel temperature and the fuel pressure. When the fuel temperature is low and the detection error is large, the amount of fuel injected into the internal combustion engine is corrected according to the fuel composition detected based on the fuel temperature and fuel pressure when the fuel temperature is high. With the use of the fuel supply device for a liquefied petroleum gas internal combustion engine according to claim 1, when the detection error is large at low temperatures, the fuel is determined according to the fuel composition detected based on the fuel temperature and fuel pressure at high temperatures with small detection errors. By correcting the amount, the detection error of the fuel composition can be reduced, and the amount of fuel injected into the internal combustion engine can be corrected more accurately.

【０００７】また、本発明の第２発明は、請求項２に記
載されたとおりの液化石油ガス内燃機関の燃料供給装置
である。請求項２に記載の液化石油ガス内燃機関の燃料
供給装置では、燃料温度が高く検出誤差が小さい場合
は、燃料温度と燃料圧力に基づいて検出した燃料組成に
応じて内燃機関に噴射する燃料量を補正し、燃料温度が
低く検出誤差が大きい場合は、燃料温度が高い時の燃料
温度と燃料圧力に基づいて検出した燃料組成と燃料量と
最新の燃料量とに基づいて検出した燃料組成に応じて内
燃機関に噴射する燃料量を補正する。請求項２に記載の
液化石油ガス内燃機関の燃料供給装置を用いれば、検出
誤差が大きい低温時が継続し、燃料量の減少に伴う燃料
組成の変化が発生した場合でも、検出誤差の小さい高温
時の燃料温度と燃料圧力に基づいて検出した燃料組成
と、高温時（燃料組成を検出時）の燃料量と最新の燃料
量から燃料の消費に伴う燃料組成の変化を適切に検出す
ることで、検出誤差を小さくすることができ、更に正確
に内燃機関に噴射する燃料量を補正できる。According to a second aspect of the present invention, there is provided a fuel supply device for a liquefied petroleum gas internal combustion engine as described in claim 2. In the fuel supply device for a liquefied petroleum gas internal combustion engine according to claim 2, when the fuel temperature is high and the detection error is small, the amount of fuel injected into the internal combustion engine according to the fuel composition detected based on the fuel temperature and the fuel pressure. If the fuel temperature is low and the detection error is large, the fuel composition detected based on the fuel temperature and fuel pressure when the fuel temperature is high, the fuel amount detected based on the fuel amount, and the fuel composition detected based on the latest fuel amount are calculated. The fuel amount injected into the internal combustion engine is corrected accordingly. With the use of the fuel supply device for a liquefied petroleum gas internal combustion engine according to the second aspect, even when the low temperature at which the detection error is large continues and the fuel composition changes due to the decrease in the fuel amount, the high temperature at which the detection error is small. By detecting the fuel composition detected based on the fuel temperature and fuel pressure at the time, the fuel amount at the time of high temperature (when the fuel composition is detected) and the change in the fuel composition accompanying the consumption of the fuel from the latest fuel amount. Thus, the detection error can be reduced, and the amount of fuel injected into the internal combustion engine can be corrected more accurately.

【０００８】また、本発明の第３発明は、請求項３に記
載されたとおりの液化石油ガス内機関の燃料供給装置で
ある。請求項３に記載の液化石油ガス内燃機関の燃料供
給装置では、燃料タンク内には、撹拌手段が設けられて
いる。請求項３に記載の液化石油ガス内燃機関の燃料供
給装置を用いれば、燃料組成の検出に重要な燃料温度の
温度分布を燃料タンク内で均一化できるので、燃料組成
の検出精度が向上する。A third aspect of the present invention is a fuel supply apparatus for a liquefied petroleum gas internal combustion engine as described in claim 3. In the fuel supply device for a liquefied petroleum gas internal combustion engine according to a third aspect, a stirring means is provided in the fuel tank. By using the fuel supply device for a liquefied petroleum gas internal combustion engine according to the third aspect, the temperature distribution of the fuel temperature, which is important for the detection of the fuel composition, can be made uniform in the fuel tank, so that the detection accuracy of the fuel composition is improved.

【０００９】[0009]

【発明の実施の形態】以下に、本発明の実施の形態を図
面を用いて説明する。図１は、本発明の液化石油ガス内
燃機関の燃料供給装置の一実施の形態の概略構成図を示
したものである。図１に示す実施の形態は、車両等に用
いられるＬＰＧ内燃機関に液相のＬＰＧを燃料として供
給する、液化石油ガス内燃機関の燃料供給装置に関する
ものである。図１において、燃料タンク２０内には、燃
料（ＬＰＧ）が液相と気相の２相状態で貯蔵されてい
る。燃料タンク２０内には、燃料ポンプ２１が設けられ
ており、燃料ポンプ２１は、制御手段１１からの制御信
号に基づいて燃料タンク２０内に貯蔵されている液相燃
料を、所定圧力（例えば、５００ｋＰａ）昇圧し、燃料
供給配管２３内に圧送する。燃料ポンプ２１は、少なく
なった液相燃料をも供給できるように、燃料タンク２０
の底部に配設されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an embodiment of a fuel supply device for a liquefied petroleum gas internal combustion engine according to the present invention. The embodiment shown in FIG. 1 relates to a fuel supply device for a liquefied petroleum gas internal combustion engine that supplies liquid-phase LPG as fuel to an LPG internal combustion engine used in a vehicle or the like. In FIG. 1, fuel (LPG) is stored in a fuel tank 20 in a two-phase state of a liquid phase and a gas phase. A fuel pump 21 is provided in the fuel tank 20, and the fuel pump 21 converts the liquid-phase fuel stored in the fuel tank 20 based on a control signal from the control means 11 to a predetermined pressure (for example, The pressure is increased and the pressure is fed into the fuel supply pipe 23. The fuel pump 21 is provided with a fuel tank 20 so as to supply a reduced amount of liquid fuel.
It is arranged at the bottom of the.

【００１０】燃料供給配管２３には、燃料ポンプ２１か
らの燃料供給を即時に停止するための遮断弁２２が設け
られている。遮断弁２２は、制御手段１１からの制御信
号に基づいて制御され、燃料供給配管２３内の経路を開
閉する。燃料供給配管２３は、デリバリ配管２４に接続
されており、燃料ポンプ２１から圧送された液相燃料
は、デリバリ配管２４に供給される。デリバリ配管２４
には、内燃機関の各気筒に設けられたインジェクタ３１
〜３４が接続されている。この図１の例は、４気筒の内
燃機関の例を示している。インジェクタ３１〜３４は、
制御手段１１からの制御信号に基づいて、デリバリ配管
２４から供給される液相燃料を、内燃機関の各気筒に噴
射する。The fuel supply pipe 23 is provided with a shutoff valve 22 for immediately stopping the fuel supply from the fuel pump 21. The shutoff valve 22 is controlled based on a control signal from the control unit 11 to open and close a path in the fuel supply pipe 23. The fuel supply pipe 23 is connected to the delivery pipe 24, and the liquid fuel pumped from the fuel pump 21 is supplied to the delivery pipe 24. Delivery piping 24
Includes an injector 31 provided in each cylinder of the internal combustion engine.
To 34 are connected. The example of FIG. 1 shows an example of a four-cylinder internal combustion engine. The injectors 31 to 34 are
Based on a control signal from the control means 11, the liquid fuel supplied from the delivery pipe 24 is injected into each cylinder of the internal combustion engine.

【００１１】また、デリバリ配管２４には、燃料リター
ン配管２５の一端が接続されており、燃料リターン配管
２５の他端は、燃料タンク２０に接続されている。燃料
リターン配管２５の他端の先には、（燃料タンク２０内
に）プレッシャーレギュレータ２６が設けられている。
プレッシャーレギュレータ２６は、燃料タンク２０から
圧送された液相燃料の圧力が所定圧力以上になった場合
に動作し、燃料供給配管２３、デリバリ配管２４、燃料
リターン配管２５内の過剰な液相燃料を燃料タンク２０
内に戻す。このとき、ジェットポンプ２７を介して燃料
タンク２０内に液相燃料を戻すと、燃料タンク２０内の
液相燃料が撹拌されるため、燃料タンク２０内の液相燃
料の温度分布を均一化することができる。これにより、
燃料温度の検出精度が向上し、燃料組成の検出精度を向
上させることができる。なお、ジェットポンプ２７は省
略してもよい。Further, one end of a fuel return pipe 25 is connected to the delivery pipe 24, and the other end of the fuel return pipe 25 is connected to the fuel tank 20. At the other end of the fuel return pipe 25, a pressure regulator 26 is provided (within the fuel tank 20).
The pressure regulator 26 operates when the pressure of the liquid fuel fed from the fuel tank 20 becomes equal to or higher than a predetermined pressure, and removes excess liquid fuel in the fuel supply pipe 23, the delivery pipe 24, and the fuel return pipe 25. Fuel tank 20
Put back inside. At this time, when the liquid fuel is returned into the fuel tank 20 via the jet pump 27, the liquid fuel in the fuel tank 20 is stirred, so that the temperature distribution of the liquid fuel in the fuel tank 20 is made uniform. be able to. This allows
The detection accuracy of the fuel temperature is improved, and the detection accuracy of the fuel composition can be improved. Note that the jet pump 27 may be omitted.

【００１２】デリバリ配管２４には、燃料配管内の液相
燃料の温度を検出するための温度検出手段４２（温度セ
ンサ等）と、燃料配管内の液相燃料の圧力を検出するた
めの圧力検出手段４４（圧力センサ等）が設けられ、各
々制御手段１１に接続されている。この温度と圧力も、
インジェクタから噴射する燃料量の補正に利用される。
また、燃料タンク２０には、燃料タンク２０内の液相燃
料の温度を検出するための温度検出手段４１（温度セン
サ等）と、燃料タンク２０内の液相燃料の圧力を検出す
るための圧力検出手段４３（圧力センサ等）と、燃料タ
ンク内の液相燃料の燃料量を検出するための燃料量検出
手段４５（液面センサ等）が設けられ、各々制御手段１
１に接続されている。The delivery pipe 24 has a temperature detecting means 42 (temperature sensor or the like) for detecting the temperature of the liquid fuel in the fuel pipe, and a pressure detecting means for detecting the pressure of the liquid fuel in the fuel pipe. Means 44 (such as pressure sensors) are provided and are each connected to the control means 11. This temperature and pressure also
It is used for correcting the amount of fuel injected from the injector.
The fuel tank 20 has a temperature detecting means 41 (temperature sensor or the like) for detecting the temperature of the liquid fuel in the fuel tank 20 and a pressure for detecting the pressure of the liquid fuel in the fuel tank 20. Detecting means 43 (pressure sensor or the like) and fuel amount detecting means 45 (liquid level sensor or the like) for detecting the fuel amount of the liquid fuel in the fuel tank are provided.
1 connected.

【００１３】記憶手段１２は、制御手段１１に接続され
ており、制御手段１１から読み出し及び書き込みが可能
である。制御手段１１は、検出した燃料組成（液相燃料
組成）に基づいてインジェクタから噴射する燃料量を補
正する。図１の例では、制御手段１１と記憶手段１２を
分けているが、記憶手段１２は制御手段１１の内部にあ
ってもよい。なお、本発明の液化石油ガス内燃機関の燃
料供給装置の構成は、図１に限定されるものではない。The storage unit 12 is connected to the control unit 11 and can read and write from the control unit 11. The control means 11 corrects the amount of fuel injected from the injector based on the detected fuel composition (liquid phase fuel composition). In the example of FIG. 1, the control unit 11 and the storage unit 12 are separated, but the storage unit 12 may be inside the control unit 11. The configuration of the fuel supply device for a liquefied petroleum gas internal combustion engine of the present invention is not limited to FIG.

【００１４】次に、図２に、密閉された容器内での燃料
（ＬＰＧ）の温度と圧力の関係を示す。この図２は、密
閉された容器内での燃料が平衡状態（気化及び液化が促
進されず、液相の量も気相の圧力も変化しない安定した
状態）になった場合の、温度（横軸に設定）と蒸気圧力
（縦軸に設定）の関係を示している。各曲線で表される
グラフは、液相燃料内のプロパンの割合（燃料組成）に
よって平衡状態が異なることを表している。また、この
グラフは、燃料の液相状態と気相状態の境界をも表して
いる。このグラフの下方に対応する温度と圧力が継続し
ている場合は、気化が進み気相状態になり、グラフの上
方に対応する温度と圧力が継続している場合は、液化が
進み液相状態になる。また、密閉された容器内に貯蔵さ
れると、その時の温度に対応する平衡状態の位置（当該
温度のグラフ上の位置）に向かって気化あるいは液化が
進行し、徐々に蒸気圧力が増加あるいは減少して、やが
て平衡状態の位置（当該温度のグラフ上の位置）に達し
て安定する。また、密閉された容器内での燃料の蒸気圧
力は、当該容器内の液相燃料の圧力とほぼ同じになる。Next, FIG. 2 shows the relationship between the temperature and pressure of the fuel (LPG) in the sealed container. FIG. 2 shows the temperature (horizontal) when the fuel in the closed vessel is in an equilibrium state (a stable state in which vaporization and liquefaction are not promoted and the amount of the liquid phase and the pressure of the gas phase do not change). The relationship between the pressure (set on the axis) and the steam pressure (set on the vertical axis) is shown. The graphs represented by the curves show that the equilibrium state differs depending on the ratio of propane in the liquid fuel (fuel composition). This graph also shows the boundary between the liquid state and the gaseous state of the fuel. If the temperature and pressure corresponding to the lower part of this graph continue, vaporization proceeds to a gas phase state, and if the temperature and pressure corresponding to the upper part of the graph continues, liquefaction proceeds and the liquid phase state become. Also, when stored in a closed container, vaporization or liquefaction proceeds toward the equilibrium position (the position on the graph of the temperature) corresponding to the temperature at that time, and the vapor pressure gradually increases or decreases. Eventually, the temperature reaches the equilibrium position (the temperature on the graph) and stabilizes. Further, the vapor pressure of the fuel in the closed container is substantially equal to the pressure of the liquid fuel in the container.

【００１５】例えば、密閉された容器内に燃料を貯蔵し
て、平衡状態時の液相燃料の温度と圧力を計測した結
果、温度が１５℃で圧力が３００ｋＰａであった場合、
図２中の状態（Ａ）１００の位置であることがわかる。
この状態（Ａ）１００の位置は、プロパンの割合（燃料
組成）が４０％のグラフ上であるので、当該燃料のプロ
パンとブタンの割合は、各々４０％と６０％であること
も判断できる。また、グラフが特定できたので、当該燃
料の温度を１５℃から３０℃に上昇させ、平衡状態にな
った場合（図２中の状態（Ａａ）１１０の位置）の液相
燃料の圧力を計測すると、約５５０ｋＰａであることが
推定できる。For example, when the fuel is stored in a closed container and the temperature and the pressure of the liquid phase fuel in the equilibrium state are measured and the temperature is 15 ° C. and the pressure is 300 kPa,
It can be seen that the position is in the state (A) 100 in FIG.
Since the position of this state (A) 100 is on the graph where the proportion of propane (fuel composition) is 40%, it can also be determined that the proportions of propane and butane in the fuel are 40% and 60%, respectively. In addition, since the graph was specified, the temperature of the fuel was increased from 15 ° C. to 30 ° C., and the pressure of the liquid phase fuel was measured when the fuel became equilibrium (the position of the state (Aa) 110 in FIG. 2). Then, it can be estimated that it is about 550 kPa.

【００１６】次に、図３に、密閉された容器内での燃料
（ＬＰＧ）の残液量と燃料組成の関係を示す。この図３
は、密閉された容器内での燃料が平衡状態になった場合
且つ温度が１５℃の場合の、残液量（横軸に設定）と残
液の燃料組成（縦軸に設定）の関係を示している。各曲
線で表されるグラフは、各々容器に充填した時の液相燃
料組成を表している。燃料の気化は、沸点の低いプロパ
ンが優先的に進み、残液が減少すると容器内の空間が増
加してプロパンの気化が進む。このため、充填直後の液
相燃料組成に対して、残液の減少に伴い液相燃料中のプ
ロパンの割合（燃料組成）も減少し、ブタンの割合が増
加する。燃料組成が変化すると、図２で特定されるグラ
フが変わるため、燃料組成の判定は、随時行う必要があ
る。FIG. 3 shows the relationship between the amount of residual fuel (LPG) and the fuel composition in a closed container. This figure 3
Shows the relationship between the amount of residual liquid (set on the horizontal axis) and the fuel composition of the residual liquid (set on the vertical axis) when the fuel in the closed container is in an equilibrium state and the temperature is 15 ° C. Is shown. The graph represented by each curve represents the liquid phase fuel composition when each is filled in a container. As for the vaporization of fuel, propane having a low boiling point proceeds preferentially, and when the residual liquid decreases, the space in the container increases and the vaporization of propane proceeds. For this reason, with respect to the liquid fuel composition immediately after filling, the proportion of propane in the liquid fuel (fuel composition) decreases as the residual liquid decreases, and the proportion of butane increases. When the fuel composition changes, the graph specified in FIG. 2 changes. Therefore, the determination of the fuel composition needs to be performed as needed.

【００１７】例えば、密閉された容器内に燃料を貯蔵し
て、平衡状態時の液相燃料の温度と圧力と残液量を計測
した結果、温度が１５℃、圧力が３００ｋＰａ、残液量
が５０％であったとする。まず、温度と圧力から、当該
燃料は図２中の状態（Ａ）１００の位置であることがわ
かる。この状態（Ａ）１００の位置は、プロパンの割合
（燃料組成）が４０％のグラフ上であるので、当該燃料
のプロパンとブタンの割合は、各々４０％と６０％であ
ることも判断できる。次に、図３から、縦軸４０％（プ
ロパンの割合４０％）と、横軸５０％（残液量５０％）
の交点が状態（Ａ）１００であることが判断できるの
で、当該燃料の充填時の燃料組成はプロパンが６０％で
あったことも判断できる。図３のグラフが特定できたの
で、当該燃料の残液量が５０％から３０％に減少する
と、平衡状態になった場合（図３中の状態（Ａｂ）１２
０の位置）の液相燃料の組成は、プロパンが約２６％で
あることが推定できる。For example, the fuel is stored in a sealed container, and the temperature, pressure, and residual liquid amount of the liquid fuel in an equilibrium state are measured. Assume that it was 50%. First, it can be seen from the temperature and the pressure that the fuel is at the position of the state (A) 100 in FIG. Since the position of this state (A) 100 is on the graph where the proportion of propane (fuel composition) is 40%, it can be determined that the proportions of propane and butane in the fuel are 40% and 60%, respectively. Next, from FIG. 3, the vertical axis 40% (propane ratio 40%) and the horizontal axis 50% (remaining liquid amount 50%)
Can be determined to be in the state (A) 100, it can be determined that the fuel composition at the time of filling the fuel is propane of 60%. Since the graph of FIG. 3 has been identified, when the residual liquid amount of the fuel decreases from 50% to 30%, the fuel becomes equilibrium (state (Ab) 12 in FIG. 3).
The composition of the liquid phase fuel (position 0) can be estimated to be about 26% propane.

【００１８】次に、図４を用いて、燃料温度が所定温度
以上であるか否かを判定するための温度条件について説
明する。図２より、燃料温度が低い場合は蒸気圧力（燃
料圧力）も低く、燃料温度と燃料圧力ともに検出手段
（センサ等）の検出値が小さい。そのため、低温低圧時
において、検出した燃料温度と燃料圧力は、高温高圧時
と比較して誤差が大きい。よって、所定温度は、温度検
出手段４１の温度センサ特性だけでなく、圧力検出手段
４３の圧力センサ特性等による誤差をも考慮して設定さ
れる。また、センサ誤差だけでなく、図２に示すよう
に、低温の方がグラフが密になっており各グラフ間の圧
力差が小さくなるため、低温低圧時は、検出した温度と
圧力からグラフを特定するのは、高温高圧時より困難で
ある。これらを考慮に入れ、例えば、本実施の形態で
は、所定温度（図４中のＴ２）を１５℃に設定した。な
お、この所定温度の判定は、ハンチングを避けるため
に、図４の例に示すようなヒステリシスを設けることが
好ましい。図４中のＴ１には、Ｔ２よりも低い温度（例
えば、１２℃）を設定する。これにより、温度がＴ１よ
り低い状態から徐々に増加してＴ２に達するまでは温度
条件が不成立と判定し、温度がＴ２以上になった時点で
温度条件が成立と判定する。そして、温度がＴ２より高
い状態から徐々に減少してＴ１に達するまでは温度条件
が成立と判定し、温度がＴ１未満になった時点で温度条
件が不成立と判定する。Next, a temperature condition for determining whether or not the fuel temperature is equal to or higher than a predetermined temperature will be described with reference to FIG. As shown in FIG. 2, when the fuel temperature is low, the steam pressure (fuel pressure) is also low, and the detection values of the detecting means (such as a sensor) are small for both the fuel temperature and the fuel pressure. For this reason, the detected fuel temperature and fuel pressure have a larger error at low temperature and low pressure than at high temperature and high pressure. Therefore, the predetermined temperature is set in consideration of not only the temperature sensor characteristics of the temperature detection unit 41 but also errors due to the pressure sensor characteristics of the pressure detection unit 43 and the like. Also, as shown in FIG. 2, not only the sensor error but also the graph at the low temperature is denser and the pressure difference between the graphs is small. It is more difficult to specify than at high temperatures and pressures. Taking these into consideration, for example, in the present embodiment, the predetermined temperature (T2 in FIG. 4) is set to 15 ° C. In order to avoid hunting, it is preferable to provide a hysteresis as shown in the example of FIG. For T1 in FIG. 4, a temperature lower than T2 (for example, 12 ° C.) is set. Thus, it is determined that the temperature condition is not satisfied until the temperature gradually increases from a state lower than T1 to reach T2, and it is determined that the temperature condition is satisfied when the temperature becomes equal to or higher than T2. Then, it is determined that the temperature condition is satisfied until the temperature gradually decreases from the state higher than T2 to reach T1, and it is determined that the temperature condition is not satisfied when the temperature becomes lower than T1.

【００１９】次に、図５のフローチャートと、図２、図
３、図４を用いて、具体的な動作内容について説明す
る。以下の動作は、制御手段１１が備えているＣＰＵ
が、ＲＯＭ等に記憶されているプログラムに従って燃料
組成の検出及び燃料組成に基づく燃料補正量の算出処理
を実行する例である。また、制御手段１１への入力は、
ＣＰＵが入力回路（Ａ／Ｄ変換器等）から取り込み、記
憶手段１２へのアクセスは、ＣＰＵが記憶手段１２に書
き込み（記憶）あるいは記憶手段１２から読み出しする
ことで実行される。また、処理のタイミングは、所定期
間毎または燃料量が所定量減少する毎等、種々のタイミ
ングで実行することができる。なお、内燃機関に噴射す
る燃料量の算出は、別のタイミングで実行される。Next, the specific operation will be described with reference to the flowchart of FIG. 5 and FIGS. 2, 3 and 4. The following operation is performed by the CPU provided in the control unit 11.
Is an example of executing a process of detecting a fuel composition and calculating a fuel correction amount based on the fuel composition according to a program stored in a ROM or the like. The input to the control means 11 is
The CPU takes in the data from an input circuit (such as an A / D converter) and accesses the storage unit 12 by writing (storing) or reading out from the storage unit 12 by the CPU. Further, the timing of the process can be executed at various timings, such as every predetermined period or every time the fuel amount decreases by a predetermined amount. The calculation of the amount of fuel to be injected into the internal combustion engine is executed at another timing.

【００２０】この場合、制御手段は、温度検出手段で検
出した温度が所定温度以上の場合は、温度検出手段で検
出した温度と圧力検出手段で検出した圧力に基づいて燃
料タンク内の燃料組成を検出する。そして、検出した燃
料組成に基づいて燃料補正量を算出し、燃料補正量と燃
料組成と燃料量を記憶手段に記憶する。また、温度検出
手段で検出した温度が所定温度未満の場合は、記憶手段
に記憶されている燃料組成と燃料量と、最新の燃料量に
基づいて燃料補正量を算出して記憶手段に記憶する。In this case, when the temperature detected by the temperature detecting means is equal to or higher than the predetermined temperature, the control means determines the fuel composition in the fuel tank based on the temperature detected by the temperature detecting means and the pressure detected by the pressure detecting means. To detect. Then, a fuel correction amount is calculated based on the detected fuel composition, and the fuel correction amount, the fuel composition, and the fuel amount are stored in the storage unit. If the temperature detected by the temperature detecting means is lower than the predetermined temperature, a fuel correction amount is calculated based on the fuel composition and the fuel amount stored in the storing means and the latest fuel amount and stored in the storing means. .

【００２１】まず、ステップＳ１００で、その時点（検
出時点）の燃料タンク内の燃料温度、燃料圧力、燃料量
を取り込む。温度検出手段４１の検出値をＡ／Ｄ変換
し、Ａ／Ｄ変換した値を温度検出手段の特性に基いて温
度に換算し、燃料タンク２０内の燃料温度を検出する。
同様に、圧力検出手段４３の検出値から燃料タンク２０
内の燃料圧力を検出し、燃料量検出手段４５の検出値か
ら燃料タンク２０内の液相燃料量を検出する。例えば、
検出した燃料温度は１５℃、燃料圧力は３００ｋＰａ、
燃料量は５０％であったとする。First, in step S100, the fuel temperature, fuel pressure, and fuel amount in the fuel tank at that time (detection time) are taken. The detection value of the temperature detecting means 41 is A / D converted, and the value obtained by the A / D conversion is converted into a temperature based on the characteristics of the temperature detecting means, and the fuel temperature in the fuel tank 20 is detected.
Similarly, based on the detection value of the pressure detection means 43, the fuel tank 20
The fuel pressure in the fuel tank 20 is detected, and the liquid phase fuel amount in the fuel tank 20 is detected from the detected value of the fuel amount detecting means 45. For example,
The detected fuel temperature is 15 ° C, the fuel pressure is 300 kPa,
Assume that the fuel amount is 50%.

【００２２】次に、ステップＳ１１０で、温度条件が成
立しているか否か（検出した燃料温度が所定温度以上か
否か）を判定する。ステップＳ１１０で温度条件が成立
している場合（Ｙｅｓ）は、ステップＳ１２０ａに進
み、温度条件が成立していない場合（Ｎｏ）は、ステッ
プＳ１２０ｂに進む。この例では、図４中のＴ２（所定
温度）を１５℃に設定しており、燃料温度が１５℃なの
で、ステップＳ１２０ａに進む。Next, in step S110, it is determined whether the temperature condition is satisfied (whether the detected fuel temperature is equal to or higher than a predetermined temperature). If the temperature condition is satisfied in step S110 (Yes), the process proceeds to step S120a, and if the temperature condition is not satisfied (No), the process proceeds to step S120b. In this example, T2 (predetermined temperature) in FIG. 4 is set to 15 ° C., and since the fuel temperature is 15 ° C., the process proceeds to step S120a.

【００２３】ステップＳ１２０ａでは、検出した燃料温
度と燃料圧力から、燃料組成を検出し、燃料補正量を算
出して記憶する。この例では、燃料温度が１５℃、燃料
圧力が３００ｋＰａ（図２中の状態（Ａ）１００の位
置）であるので、図２のグラフから当該燃料の組成は、
プロパン４０％のグラフに特定できる。この場合は、燃
料組成は４０％であることがわかる。燃料補正量は、こ
の４０％を用いて算出され（例えば、１／０．４＝２．
５と算出）、記憶手段に記憶される。続くステップＳ１
３０では、上記で検出した燃料組成（この例では、４０
％）と、検出した燃料タンク２０内の燃料量（この例で
は、５０％）を記憶手段１２に記憶する。記憶手段に記
憶された燃料補正量は、別のタイミング毎（例えば、内
燃機関の回転角度が所定角度に達する毎）に、インジェ
クタから噴射する燃料量を演算する処理にて燃料量を補
正するために使用される。そして、補正された燃料量に
基づいてインジェクタの開弁時間が制御される。In step S120a, a fuel composition is detected from the detected fuel temperature and fuel pressure, and a fuel correction amount is calculated and stored. In this example, since the fuel temperature is 15 ° C. and the fuel pressure is 300 kPa (the position of the state (A) 100 in FIG. 2), the composition of the fuel from the graph of FIG.
It can be specified in the graph of propane 40%. In this case, the fuel composition is found to be 40%. The fuel correction amount is calculated using this 40% (for example, 1 / 0.4 = 2.
5) and stored in the storage means. Subsequent step S1
At 30, the fuel composition detected above (in this example, 40
%) And the detected amount of fuel in the fuel tank 20 (50% in this example) is stored in the storage means 12. The fuel correction amount stored in the storage means is used for correcting the fuel amount by a process of calculating the fuel amount injected from the injector at another timing (for example, each time the rotation angle of the internal combustion engine reaches a predetermined angle). Used for Then, the valve opening time of the injector is controlled based on the corrected fuel amount.

【００２４】この後、内燃機関を運転中、燃料温度が下
がり（例えば、燃料温度が１２℃未満になり）、しばら
く運転を継続して燃料タンク内の燃料が減少した場合を
例にして説明する。この場合、記憶手段１２には、燃料
組成は４０％、燃料量は５０％が記憶されている。例え
ば、ステップＳ１００で検出した燃料温度が１０℃、燃
料圧力は２５０ｋＰａ、燃料量は３０％であったとす
る。次に、ステップＳ１１０で、温度条件が成立してい
るか否か（検出した燃料温度が所定温度以上か否か）を
判定する。この例では、図４中のＴ２（所定温度）を１
５℃に設定し、図４中のＴ１を１２℃に設定しており、
燃料温度が１０℃なので、ステップＳ１２０ｂに進む。Subsequently, a description will be given of an example in which the fuel temperature decreases during the operation of the internal combustion engine (for example, the fuel temperature becomes less than 12 ° C.), and the operation is continued for a while to reduce the fuel in the fuel tank. . In this case, the storage means 12 stores a fuel composition of 40% and a fuel amount of 50%. For example, it is assumed that the fuel temperature detected in step S100 is 10 ° C., the fuel pressure is 250 kPa, and the fuel amount is 30%. Next, in step S110, it is determined whether the temperature condition is satisfied (whether the detected fuel temperature is equal to or higher than a predetermined temperature). In this example, T2 (predetermined temperature) in FIG.
5 ° C., and T1 in FIG. 4 was set to 12 ° C.
Since the fuel temperature is 10 ° C., the process proceeds to step S120b.

【００２５】次に、ステップＳ１２０ｂでは、記憶手段
に記憶されている燃料組成と燃料量と、最新の燃料量に
基づいて燃料組成を検出し、燃料補正量を算出して記憶
する。記憶手段は、内燃機関の運転を停止（車両のイグ
ニッションスイッチ等をオフ）した後も記憶内容を保持
していることが好ましいため、不揮発性メモリ（例え
ば、ＥＥＰＲＯＭ）等であることが好ましい。まず、記
憶手段に記憶されている燃料組成（この例では４０
％）、燃料量（この例では５０％）から、図３中のグラ
フを特定する。この例では、燃料組成４０％と燃料量５
０％から、図３の縦軸４０％（燃料組成）と横軸５０％
（燃料量）の位置（図３中の状態（Ａ）１００）を含む
燃料タンク充填時６０％のグラフが特定できる。なお、
図３のグラフは、１５℃のグラフであるが、実際には各
温度に対応するグラフが存在しており、各温度毎に最適
なグラフを用いる。本実施の形態の説明では、図３（１
５℃のグラフ）を１０℃のグラフに代用して説明する。
図３のグラフを特定後、当該グラフ上で、最新の燃料量
に対応する位置を算出する。この例では、最新の燃料量
は３０％であることより、図３中の状態（Ａｂ）１２０
が該当する位置であることが算出される。状態（Ａｂ）
１２０の位置の燃料組成（プロパン濃度）は、約２６％
であることがわかる。燃料補正量は、この２６％を用い
て算出され（例えば、１／０．２６＝約３．８５と算
出）、記憶手段に記憶される。記憶手段に記憶された燃
料補正量は、別のタイミング毎（例えば、内燃機関の回
転角度が所定角度に達する毎）に、インジェクタから噴
射する燃料量を演算する処理にて燃料量を補正するため
に使用される。そして、補正された燃料量に基づいてイ
ンジェクタの開弁時間が制御される。上記の説明で、各
グラフを特定する算出（演算）方法、特定したグラフ上
での状態（Ａｘ）の位置の算出（演算）方法等は、種々
の算出（演算）方法が可能である。Next, in step S120b, the fuel composition is detected based on the fuel composition and the fuel quantity stored in the storage means and the latest fuel quantity, and the fuel correction quantity is calculated and stored. The storage means preferably retains the stored contents even after the operation of the internal combustion engine is stopped (turning off the ignition switch or the like of the vehicle), and is therefore preferably a non-volatile memory (for example, an EEPROM). First, the fuel composition stored in the storage means (40 in this example)
%) And the fuel amount (50% in this example), the graph in FIG. 3 is specified. In this example, the fuel composition is 40% and the fuel amount is 5
From 0%, the vertical axis of FIG. 3 is 40% (fuel composition) and the horizontal axis is 50%.
A graph of 60% when the fuel tank is filled including the position of (fuel amount) (state (A) 100 in FIG. 3) can be specified. In addition,
Although the graph of FIG. 3 is a graph at 15 ° C., a graph corresponding to each temperature actually exists, and an optimal graph is used for each temperature. In the description of the present embodiment, FIG.
The description will be made by substituting the graph at 5 ° C.) for the graph at 10 ° C.
After the graph of FIG. 3 is specified, a position corresponding to the latest fuel amount is calculated on the graph. In this example, since the latest fuel amount is 30%, the state (Ab) 120 in FIG.
Is calculated as the corresponding position. State (Ab)
The fuel composition (propane concentration) at position 120 is about 26%
It can be seen that it is. The fuel correction amount is calculated using this 26% (for example, calculated as 1 / 0.26 = about 3.85) and stored in the storage means. The fuel correction amount stored in the storage means is used to correct the fuel amount by a process of calculating the fuel amount injected from the injector at each different timing (for example, each time the rotation angle of the internal combustion engine reaches a predetermined angle). Used for Then, the valve opening time of the injector is controlled based on the corrected fuel amount. In the above description, various calculation (calculation) methods are possible as the calculation (calculation) method for specifying each graph, the calculation (calculation) method of the position of the state (Ax) on the specified graph, and the like.

【００２６】上記の説明は、記憶手段に燃料組成と燃料
量を記憶したが、以下に、上記以外の３つの実施例につ
いて説明する。１つ目は、記憶手段に燃料温度と燃料圧
力と燃料量を記憶する方法であり、２つ目は、記憶手段
に燃料組成を記憶する方法であり、３つ目は、燃料温度
と燃料圧力を記憶する方法である。In the above description, the fuel composition and the fuel amount are stored in the storage means. Hereinafter, three other embodiments will be described. The first is a method of storing the fuel temperature, the fuel pressure, and the fuel amount in the storage means, the second is a method of storing the fuel composition in the storage means, and the third is a method of storing the fuel temperature and the fuel pressure. Is a method of storing

【００２７】まず、１つ目の例について説明する。この
場合、制御手段は、温度検出手段で検出した温度が所定
温度以上の場合は、温度検出手段で検出した温度と圧力
検出手段で検出した圧力に基づいて燃料タンク内の燃料
組成を検出する。そして、検出した燃料組成に基づいて
燃料補正量を算出し、燃料補正量と温度と圧力と燃料量
を記憶手段に記憶する。また、温度検出手段で検出した
温度が所定温度未満の場合は、記憶手段に記憶されてい
る温度と圧力と燃料量と、最新の燃料量に基づいて燃料
組成を検出し、燃料補正量を算出して記憶手段に記憶す
る。処理の手順は、図５に示すフローチャートからステ
ップＳ１３０とステップＳ１２０ｂの処理内容が異な
る。図５に示すフローチャートにおいて、ステップＳ１
３０では、燃料量を記憶し、燃料組成を記憶する代わり
に燃料温度と燃料圧力を記憶する。そして、ステップＳ
１２０ｂでは、まず記憶されている燃料温度と燃料圧力
から燃料組成を検出し、さらに、検出した燃料組成と、
記憶されている燃料量と、最新の燃料量から最新の燃料
組成を検出し、検出した燃料組成に基づいて燃料補正量
を算出し、燃料補正量を記憶する。この例では、図５の
フローチャートを用いた説明と同じ燃料組成の検出結果
及び燃料補正量が得られる。First, the first example will be described. In this case, when the temperature detected by the temperature detecting means is equal to or higher than the predetermined temperature, the control means detects the fuel composition in the fuel tank based on the temperature detected by the temperature detecting means and the pressure detected by the pressure detecting means. Then, a fuel correction amount is calculated based on the detected fuel composition, and the fuel correction amount, the temperature, the pressure, and the fuel amount are stored in the storage unit. If the temperature detected by the temperature detecting means is lower than the predetermined temperature, the fuel composition is detected based on the temperature, pressure, fuel amount, and the latest fuel amount stored in the storage means, and the fuel correction amount is calculated. And store it in the storage means. The processing procedure is different from the flowchart shown in FIG. 5 in the processing content of step S130 and step S120b. In the flowchart shown in FIG.
At 30, the fuel amount and the fuel composition are stored, and instead of the fuel composition, the fuel temperature and the fuel pressure are stored. And step S
At 120b, first, the fuel composition is detected from the stored fuel temperature and fuel pressure, and further, the detected fuel composition and
The latest fuel composition is detected from the stored fuel quantity and the latest fuel quantity, a fuel correction quantity is calculated based on the detected fuel composition, and the fuel correction quantity is stored. In this example, the same fuel composition detection result and fuel correction amount as those described with reference to the flowchart of FIG. 5 are obtained.

【００２８】次に、２つ目の例について説明する。この
場合、制御手段は、温度検出手段で検出した温度が所定
温度以上の場合は、温度検出手段で検出した温度と圧力
検出手段で検出した圧力に基づいて燃料タンク内の燃料
組成を検出する。そして、検出した燃料組成に基づいて
燃料補正量を算出し、燃料補正量と燃料組成を記憶手段
に記憶する。また、温度検出手段で検出した温度が所定
温度未満の場合は、記憶手段に記憶されている燃料組成
に基づいて燃料補正量を算出して記憶手段に記憶する
が、記憶されている燃料補正量と同じなので、記憶は省
略してもよい。処理の手順は、図５に示すフローチャー
トからステップＳ１００とステップＳ１３０とステップ
Ｓ１２０ｂの処理内容が異なる。図５に示すフローチャ
ートにおいて、ステップＳ１００では、燃料量の読み込
みを省略し、ステップＳ１３０では、燃料量を記憶せ
ず、燃料組成を記憶する。そして、ステップＳ１２０ｂ
では、記憶されている燃料組成を読み出し、読み出した
燃料組成に基づいて燃料補正量を算出し、燃料補正量を
記憶する。この例では、図５のフローチャートを用いた
説明と比較し、燃料の消費に伴う燃料組成の補正を省略
しているので、低温時に内燃機関を継続運転して燃料を
消費した場合等において燃料組成の検出結果の誤差が大
きく（燃料消費に伴う燃料組成の減少があるので、実際
の燃料組成はもっと小さい）、燃料補正量の誤差も大き
い（燃料組成の減少に伴い、実際の燃料補正量はもっと
大きい）。また、この例では、燃料組成の検出には、燃
料タンク内の燃料量検出手段を必要としない。Next, a second example will be described. In this case, when the temperature detected by the temperature detecting means is equal to or higher than the predetermined temperature, the control means detects the fuel composition in the fuel tank based on the temperature detected by the temperature detecting means and the pressure detected by the pressure detecting means. Then, a fuel correction amount is calculated based on the detected fuel composition, and the fuel correction amount and the fuel composition are stored in the storage means. When the temperature detected by the temperature detecting means is lower than the predetermined temperature, the fuel correction amount is calculated based on the fuel composition stored in the storage means and stored in the storage means. Since it is the same as above, the storage may be omitted. The processing procedure is different from the flowchart shown in FIG. 5 in the processing contents of step S100, step S130, and step S120b. In the flowchart shown in FIG. 5, in step S100, reading of the fuel amount is omitted, and in step S130, the fuel composition is stored without storing the fuel amount. Then, step S120b
Then, the stored fuel composition is read, a fuel correction amount is calculated based on the read fuel composition, and the fuel correction amount is stored. In this example, as compared with the description using the flowchart of FIG. 5, the correction of the fuel composition accompanying the consumption of the fuel is omitted. Therefore, when the internal combustion engine is continuously operated at a low temperature and the fuel is consumed, the fuel composition is not changed. The error in the detection result is large (the actual fuel composition is smaller because there is a decrease in the fuel composition due to fuel consumption), and the error in the fuel correction amount is also large (the actual fuel correction amount is Larger). Further, in this example, the detection of the fuel composition does not require the fuel amount detecting means in the fuel tank.

【００２９】次に、３つ目の例について説明する。この
場合、制御手段は、温度検出手段で検出した温度が所定
温度以上の場合は、温度検出手段で検出した温度と圧力
検出手段で検出した圧力に基づいて燃料タンク内の燃料
組成を検出する。そして、検出した燃料組成に基づいて
燃料補正量を算出し、燃料補正量と温度と圧力を記憶手
段に記憶する。また、温度検出手段で検出した温度が所
定温度未満の場合は、記憶手段に記憶されている温度と
圧力に基づいて燃料組成を検出し、燃料補正量を算出し
て記憶手段に記憶するが、記憶されている燃料補正量と
同じなので、記憶は省略してもよい。処理の手順は、図
５に示すフローチャートからステップＳ１００とステッ
プＳ１３０とステップＳ１２０ｂの処理内容が異なる。
図５に示すフローチャートにおいて、ステップＳ１００
では、燃料量の読み込みを省略し、ステップＳ１３０で
は、燃料量を記憶せず、燃料組成を記憶する代わりに燃
料温度と燃料圧力を記憶する。そして、ステップＳ１２
０ｂでは、記憶されている燃料温度と燃料圧力から燃料
組成を検出し、検出した燃料組成に基づいて燃料補正量
を算出し、燃料補正量を記憶する。この例では、２つ目
の例と同様に、図５のフローチャートを用いた説明と比
較し、燃料の消費に伴う燃料組成の補正を省略している
ので、低温時に内燃機関を継続運転して燃料を消費した
場合等において燃料組成の検出結果の誤差が大きく（燃
料消費に伴う燃料組成の減少があるので、実際の燃料組
成はもっと小さい）、燃料補正量の誤差も大きい（燃料
組成の減少に伴い、実際の燃料補正量はもっと大き
い）。また、この例では、燃料組成の検出には、燃料タ
ンク内の燃料量検出手段を必要としない。Next, a third example will be described. In this case, when the temperature detected by the temperature detecting means is equal to or higher than the predetermined temperature, the control means detects the fuel composition in the fuel tank based on the temperature detected by the temperature detecting means and the pressure detected by the pressure detecting means. Then, a fuel correction amount is calculated based on the detected fuel composition, and the fuel correction amount, the temperature, and the pressure are stored in the storage unit. Further, when the temperature detected by the temperature detecting means is lower than the predetermined temperature, the fuel composition is detected based on the temperature and the pressure stored in the storing means, the fuel correction amount is calculated and stored in the storing means, Since it is the same as the stored fuel correction amount, the storage may be omitted. The processing procedure is different from the flowchart shown in FIG. 5 in the processing contents of step S100, step S130, and step S120b.
In the flowchart shown in FIG.
Then, the reading of the fuel amount is omitted, and in step S130, the fuel temperature and the fuel pressure are stored instead of storing the fuel composition without storing the fuel amount. Then, step S12
In 0b, the fuel composition is detected from the stored fuel temperature and fuel pressure, the fuel correction amount is calculated based on the detected fuel composition, and the fuel correction amount is stored. In this example, similarly to the second example, since the correction of the fuel composition accompanying the fuel consumption is omitted as compared with the description using the flowchart of FIG. 5, the internal combustion engine is continuously operated at a low temperature. When the fuel is consumed, the error in the fuel composition detection result is large (the actual fuel composition is smaller because the fuel composition is reduced due to fuel consumption), and the error in the fuel correction amount is large (the fuel composition is reduced). Accordingly, the actual fuel correction amount is larger). Further, in this example, the detection of the fuel composition does not require the fuel amount detecting means in the fuel tank.

【００３０】本発明の液化石油ガス内燃機関の燃料供給
装置は、本実施の形態で説明した例に限定されず、本発
明の要旨を変更しない範囲で種々の変更、追加、削除が
可能である。例えば、図１では内燃機関が４気筒の例を
示しているが、６気筒の内燃機関であってもよい。ま
た、図１では、制御手段は１つであるが、内燃機関と燃
料タンクは、車内での距離が離れているため、各々制御
手段を備えてもよい。例えば、内燃機関の制御手段に
は、配管内の燃料温度の取り込みと、インジェクタから
の燃料噴射の制御を担当させる。そして、燃料タンクの
制御手段には、燃料ポンプと遮断弁の出力制御を担当さ
せる。各制御手段は車内ＬＡＮ等で接続され、必要なデ
ータは、メッセージの送受信で受け渡しあるいは取得さ
せることもできる。このように、入出力及び処理内容を
分散し、分散した入出力及び処理を別々の制御手段にて
分担させることも可能である。また、図２、図３中の、
各燃料の状態（状態（Ａ）１００〜状態（Ａｂ）１２
０）の算出において、ＣＰＵで算出する方法は、種々の
方法が可能である。また、本発明の液化石油ガス内燃機
関の燃料供給装置の動作は、本実施の形態のフローチャ
ート図及び説明内容に限定されるものではない。また、
以上（≧）、以下（≦）、より大きい（＞）、未満
（＜）等は、等号を含んでも含まなくてもよい。また、
燃料の特性は、図２、図３に示す特性図に限定されるも
のではない。また、本実施の形態で説明に用いた数値は
一例であり、この数値に限定されるものではない。The fuel supply device for a liquefied petroleum gas internal combustion engine of the present invention is not limited to the example described in the present embodiment, and various changes, additions, and deletions can be made without changing the gist of the present invention. . For example, FIG. 1 shows an example in which the internal combustion engine has four cylinders. However, the internal combustion engine may have six cylinders. In FIG. 1, the number of the control means is one. However, since the internal combustion engine and the fuel tank are separated from each other in the vehicle, the control means may be provided respectively. For example, the control means of the internal combustion engine is in charge of taking in the fuel temperature in the pipe and controlling fuel injection from the injector. The control means of the fuel tank is in charge of controlling the output of the fuel pump and the shut-off valve. Each control means is connected via an in-vehicle LAN or the like, and necessary data can be transferred or obtained by transmitting and receiving messages. In this way, the input / output and processing contents can be distributed, and the distributed input / output and processing can be shared by separate control means. Also, in FIGS. 2 and 3,
State of each fuel (state (A) 100 to state (Ab) 12
In the calculation of 0), various methods are possible as the method of calculation by the CPU. Further, the operation of the fuel supply device for a liquefied petroleum gas internal combustion engine of the present invention is not limited to the flowchart and the description of the present embodiment. Also,
Above (≧), below (≦), greater than (>), less than (<) and the like may or may not include the equal sign. Also,
The characteristics of the fuel are not limited to the characteristic diagrams shown in FIGS. The numerical values used in the description of the present embodiment are merely examples, and the present invention is not limited to these numerical values.

【００３１】[0031]

【発明の効果】以上説明したように、請求項１〜３のい
ずれかに記載の液化石油ガス内燃機関の燃料供給装置を
用いれば、低温時であっても燃料組成の検出誤差を小さ
くすることができ、もって内燃機関に噴射する燃料量を
より正確に補正することができる液化石油ガス内燃機関
の燃料供給装置を提供できる。As described above, the use of the fuel supply device for a liquefied petroleum gas internal combustion engine according to any one of claims 1 to 3 reduces the fuel composition detection error even at low temperatures. Thus, it is possible to provide a fuel supply device for a liquefied petroleum gas internal combustion engine, which can more accurately correct the amount of fuel injected into the internal combustion engine.

【図面の簡単な説明】[Brief description of the drawings]

【図１】液化石油ガス内燃機関の燃料供給装置の一実施
の形態の概略構成図である。FIG. 1 is a schematic configuration diagram of an embodiment of a fuel supply device for a liquefied petroleum gas internal combustion engine.

【図２】燃料（ＬＰＧ）の、温度と圧力の関係を表す特
性図の例である。FIG. 2 is an example of a characteristic diagram showing a relationship between temperature and pressure of fuel (LPG).

【図３】燃料タンク内の残液燃料量と残液に含まれるプ
ロパン割合の関係を表す特性図の例である。FIG. 3 is an example of a characteristic diagram showing a relationship between a residual liquid fuel amount in a fuel tank and a propane ratio contained in the residual liquid.

【図４】温度条件の成立状態（所定温度以上であるか否
か）の例を示す図である。FIG. 4 is a diagram illustrating an example of a state where a temperature condition is satisfied (whether or not the temperature is equal to or higher than a predetermined temperature).

【図５】液化石油ガス内燃機関の燃料供給装置の動作内
容の一例を示すフローチャート図である。FIG. 5 is a flowchart illustrating an example of operation contents of a fuel supply device for a liquefied petroleum gas internal combustion engine.

【符号の説明】[Explanation of symbols]

１１ 制御手段 １２ 記憶手段 ２０ 燃料タンク ２１ 燃料ポンプ ２３ 燃料供給配管 ２４ デリバリ配管 ２５ 燃料リターン配管 ３１〜３４ インジェクタ ４１、４２ 温度検出手段 ４３、４４ 圧力検出手段 ４５ 燃料量検出手段 DESCRIPTION OF SYMBOLS 11 Control means 12 Storage means 20 Fuel tank 21 Fuel pump 23 Fuel supply pipe 24 Delivery pipe 25 Fuel return pipe 31-34 Injector 41, 42 Temperature detecting means 43, 44 Pressure detecting means 45 Fuel amount detecting means

───────────────────────────────────────────────────── 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） Ｆ０２Ｍ 21/02 Ｆ０２Ｍ 21/02 Ｌ Ｓ ３０１ ３０１Ｇ ３０１Ｑ ３０１Ｒ (72)発明者 辻野 睦 愛知県大府市共和町一丁目１番地の１ 愛 三工業株式会社内 (72)発明者 佐藤 亨 愛知県大府市共和町一丁目１番地の１ 愛 三工業株式会社内 (72)発明者 大村 房治 愛知県大府市共和町一丁目１番地の１ 愛 三工業株式会社内 (72)発明者 若林 正晴 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 林 憲示 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 斉木 利成 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 河合 利浩 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 山田 潤 愛知県西尾市下羽角町岩谷14番地 株式会 社日本自動車部品総合研究所内 Ｆターム(参考） 3G084 BA13 CA01 DA04 DA09 EA02 EB08 FA00 FA14 3G092 AB07 BB01 DE01 EC01 FA06 FA31 GA01 HB03X HB04X──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F02M 21/02 F02M 21/02 LS 301 301G 301Q 301R (72) Inventor Mutsugu Tsujino Kyowa-cho, Obu City, Aichi Prefecture 1-1-1, Ai San Kogyo Co., Ltd. (72) Inventor Tohru Sato 1-1-1, Kyowa-cho, Obu City, Aichi Prefecture Ai San Kogyo Co., Ltd. 1-1-1 cho, Aichi Sanko Kogyo Co., Ltd. (72) Inventor Masaharu Wakabayashi 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Kenji Hayashi 1 Toyota Town Toyota City, Aichi Prefecture Toyota Inside Motor Co., Ltd. (72) Inventor Toshinari Saiki 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (72) Inventor Kawai Hiroshi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Jun Yamada 14 Iwatani, Shimowasumimachi, Nishio City, Aichi Prefecture F-term in Japan Automobile Parts Research Institute Co., Ltd. 3G084 BA13 CA01 DA04 DA09 EA02 EB08 FA00 FA14 3G092 AB07 BB01 DE01 EC01 FA06 FA31 GA01 HB03X HB04X

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 燃料タンクと、内燃機関に燃料を噴射す
るインジュクタと、燃料タンク内の燃料を配管を介して
インジェクタに供給する燃料ポンプと、燃料タンク内温
度を検出する温度検出手段と、燃料タンク内圧力を検出
する圧力検出手段と、記憶手段と、制御手段とを備え、 制御手段は、温度検出手段で検出した温度が所定温度以
上の場合は、温度検出手段で検出した温度と圧力検出手
段で検出した圧力に基づいて検出した燃料組成に応じて
内燃機関に噴射する燃料量を補正し、温度検出手段で検
出した温度が所定温度未満の場合は、温度が所定温度以
上の時の温度検出手段で検出した温度と圧力検出手段で
検出した圧力に基づいて検出した燃料組成に応じて内燃
機関に噴射する燃料量を補正する、ことを特徴とする液
化石油ガス内燃機関の燃料供給装置。1. A fuel tank, an injector for injecting fuel into an internal combustion engine, a fuel pump for supplying fuel in the fuel tank to the injector via a pipe, temperature detecting means for detecting a temperature in the fuel tank, A pressure detecting means for detecting a pressure in the tank; a storage means; and a control means. When the temperature detected by the temperature detecting means is equal to or higher than a predetermined temperature, the control means detects the temperature detected by the temperature detecting means and the pressure detection. The fuel amount injected into the internal combustion engine is corrected according to the fuel composition detected based on the pressure detected by the means. If the temperature detected by the temperature detecting means is lower than the predetermined temperature, the temperature when the temperature is equal to or higher than the predetermined temperature is corrected. A liquefied petroleum gas internal combustion engine, wherein the amount of fuel injected into the internal combustion engine is corrected according to the fuel composition detected based on the temperature detected by the detection means and the pressure detected by the pressure detection means. Fuel supply system. 【請求項２】 請求項１に記載の液化石油ガス内燃機関
の燃料供給装置であって、更に、燃料タンク内の燃料量
を検出する燃料量検出手段を備え、 制御手段は、温度検出手段で検出した温度が所定温度未
満の場合は、温度が所定温度以上の時の温度検出手段で
検出した温度と圧力検出手段で検出した圧力と燃料量検
出手段で検出した燃料量と、最新の燃料量とに基づいて
検出した燃料組成に応じて内燃機関に噴射する燃料量を
補正する、ことを特徴とする液化石油ガス内燃機関の燃
料供給装置。2. The fuel supply device for a liquefied petroleum gas internal combustion engine according to claim 1, further comprising fuel amount detection means for detecting an amount of fuel in the fuel tank, wherein the control means is a temperature detection means. If the detected temperature is lower than the predetermined temperature, the temperature detected by the temperature detecting means when the temperature is equal to or higher than the predetermined temperature, the pressure detected by the pressure detecting means, the fuel amount detected by the fuel amount detecting means, and the latest fuel amount A fuel supply device for a liquefied petroleum gas internal combustion engine, wherein the fuel amount injected into the internal combustion engine is corrected according to the fuel composition detected based on the above. 【請求項３】 請求項１または２に記載の液化石油ガス
内燃機関の燃料供給装置であって、燃料タンク内には、
撹拌手段が設けられている、ことを特徴とする液化石油
ガス内燃機関の燃料供給装置。3. The fuel supply device for a liquefied petroleum gas internal combustion engine according to claim 1, wherein:
A fuel supply device for a liquefied petroleum gas internal combustion engine, comprising a stirring means.
JP2001120030A 2001-04-18 2001-04-18 Fuel supply system for liquefied petroleum gas internal combustion engine Expired - Lifetime JP3971121B2 (en)

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Application Number Priority Date Filing Date Title
JP2001120030A JP3971121B2 (en) 2001-04-18 2001-04-18 Fuel supply system for liquefied petroleum gas internal combustion engine

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JP3971121B2 JP3971121B2 (en) 2007-09-05

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100671127B1 (en) * 2004-09-25 2007-01-17 르노삼성자동차 주식회사 Method of Fuel supply apparatus for LPG Liquid Injection system
KR100834709B1 (en) 2007-07-03 2008-06-02 지멘스 오토모티브 주식회사 Method for controlling gas fuel of bi fuel car
JP2010275879A (en) * 2009-05-26 2010-12-09 Aisan Ind Co Ltd Fuel vapor pressure measurement system
KR101798017B1 (en) * 2011-06-03 2017-11-15 콘티넨탈 오토모티브 시스템 주식회사 Method for revising gas fuel quantity, apparatus applied to the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100671127B1 (en) * 2004-09-25 2007-01-17 르노삼성자동차 주식회사 Method of Fuel supply apparatus for LPG Liquid Injection system
KR100834709B1 (en) 2007-07-03 2008-06-02 지멘스 오토모티브 주식회사 Method for controlling gas fuel of bi fuel car
JP2010275879A (en) * 2009-05-26 2010-12-09 Aisan Ind Co Ltd Fuel vapor pressure measurement system
KR101798017B1 (en) * 2011-06-03 2017-11-15 콘티넨탈 오토모티브 시스템 주식회사 Method for revising gas fuel quantity, apparatus applied to the same

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