JPS59208152A - Fuel feed system for liquefied-petroleum-gas internal-combustion engine - Google Patents

Fuel feed system for liquefied-petroleum-gas internal-combustion engine

Info

Publication number
JPS59208152A
JPS59208152A JP58082724A JP8272483A JPS59208152A JP S59208152 A JPS59208152 A JP S59208152A JP 58082724 A JP58082724 A JP 58082724A JP 8272483 A JP8272483 A JP 8272483A JP S59208152 A JPS59208152 A JP S59208152A
Authority
JP
Japan
Prior art keywords
pressure
fuel
temperature
intensifier
specific gravity
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.)
Pending
Application number
JP58082724A
Other languages
Japanese (ja)
Inventor
Masaki Fujisaki
藤咲　正記
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.)
Automob Antipollut & Saf Res Center
Automobile Appliance Anti Pollution and Safety Research Center
Original Assignee
Automob Antipollut & Saf Res Center
Automobile Appliance Anti Pollution and Safety Research Center
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 Automob Antipollut & Saf Res Center, Automobile Appliance Anti Pollution and Safety Research Center filed Critical Automob Antipollut & Saf Res Center
Priority to JP58082724A priority Critical patent/JPS59208152A/en
Publication of JPS59208152A publication Critical patent/JPS59208152A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F02D19/021—Control of components of the fuel supply system
    • F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
    • 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
    • F02D19/021—Control of components of the fuel supply system
    • F02D19/022—Control of components of the fuel supply system to adjust the fuel pressure, temperature or composition
    • 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
    • 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
    • F02D19/029—Determining density, viscosity, concentration or composition
    • 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)
  • 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)

Abstract

PURPOSE:To aim at the promotion of reduction in compensating operation, by calculating fuel composition before starting but pressure and liquid specific gravity after starting with a couple of pressure and temperature intensifiers which measure fuel vapor pressure and temperature in a liquefied-petroleum-gas feed system. CONSTITUTION:In an interspace between a fuel pump 2 feeding LPG inside a fuel tank 11 under pressure and an injector 5, there are provided with a fuel reserve well 3 and a selenoid valve 4 interlocking a key switch. Each detection value of a pressure intensifier 10 and a temperature intensifier 11 measuring pressure and temperature in the fuel reserve well 3 and both of an engine speed signal 12 and a suction pipe pressure signal 13 and all inputted into an A/D converter 14. A central processing unit, on the basis of output from the A/D converter, judges fuel composition from pressure and temperature before starting but a pressure compensation factor from input out of the pressure intensifier 10 after starting as well as calculates a liquid specific gravity on the basis of input out of the temperature intensifier 11 and the fuel composition in a random access memory whereby a fundamental fuel injection quantity is calculated.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は液化石油ガス（以下ＬＰＧと略す。）の燃料供
給装置に係り、特に燃料蒸気圧力と液比重及び燃料組成
の変化に対応して制御する燃料噴射弁を備えたＬＰＧの
燃料供給装置に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a fuel supply system for liquefied petroleum gas (hereinafter abbreviated as LPG), and in particular to a system for controlling fuel vapor pressure, liquid specific gravity, and fuel composition in response to changes in fuel vapor pressure, liquid specific gravity, and fuel composition. The present invention relates to an LPG fuel supply device equipped with a fuel injection valve.

〔発明の背景〕[Background of the invention]

自動車用内燃機関の燃料として使用されるＬＰＧは販売
される季節、地域などによる燃料組成の差及び温度差に
より、燃料蒸気圧及び液比重が大きく変化する。The fuel vapor pressure and liquid specific gravity of LPG used as fuel for automobile internal combustion engines vary greatly due to differences in fuel composition and temperature depending on the season and region in which it is sold.

燃料温度と圧力により燃料組成を判定して、燃料供給量
を補正するベーパライザー、ミキサーを備えたｌ、ＰＧ
燃料供給装置は実願昭４８−１１６５３３など数件出願
公開されており、又、燃料噴射弁を備えたシステムにお
いては本願出願人が先に出願している。PG equipped with a vaporizer and mixer that determines the fuel composition based on fuel temperature and pressure and corrects the fuel supply amount.
Several applications for fuel supply devices have been published, such as Japanese Utility Model Application No. 116533/1983, and the applicant of the present invention has filed an application for a system equipped with a fuel injection valve.

しかし、燃料噴射弁全備え、ＣＰＵにて演算制御するシ
ステムにおいても、燃料組成、液比重及び燃料蒸気圧を
算出し、逐次補正制御することは、計算式が複雑の為、
演算処理時間が長く、与えられた時間内に処理すること
は困難である。又、燃料ポンプ等を細い、加圧し、燃料
蒸気圧力凹を狭め、インジェクターのダイナミックレン
ジを小さくしたものにおいては、燃料組成の判定と圧力
補正用に２ケの圧力変換器を必要とする。However, even in systems that are equipped with all fuel injection valves and are controlled by a CPU, calculating the fuel composition, liquid specific gravity, and fuel vapor pressure and performing sequential correction control requires complicated calculation formulas.
The calculation processing time is long and it is difficult to process within the given time. In addition, in the case where the fuel pump or the like is thin and pressurized, the fuel vapor pressure recess is narrowed, and the dynamic range of the injector is reduced, two pressure transducers are required for determining the fuel composition and correcting the pressure.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、上述の、演算処理時間の短縮とセンサ
ーである圧力変換器の数量を減らし、一対の圧力及び温
度変換器にて、エンジン始動前は燃料組成を判定し、コ
ンピューター内ＲＡＭに記憶させ、始動後は、圧力変換
器にて圧力補正係数全算出し、温度変換器による信号と
ＲＡＭの燃料組成により液比重を算振し、補正制御する
ことにより、一対の圧力及び温度変換器により、補正計
算の処理時間の短い、燃料噴射弁を備えたＬＰＧの燃料
供給装置の提供にある。The purpose of the present invention is to shorten the calculation processing time and reduce the number of pressure transducers that are sensors, as described above, and to determine the fuel composition before starting the engine using a pair of pressure and temperature transducers, and store it in the RAM in the computer. After starting, the pressure converter calculates all the pressure correction coefficients, calculates the liquid specific gravity based on the signal from the temperature converter and the fuel composition in the RAM, and performs correction control. Accordingly, an object of the present invention is to provide an LPG fuel supply device equipped with a fuel injection valve that requires a short processing time for correction calculation.

〔発明の実施例〕[Embodiments of the invention]

以下本発明の一実施例を第１図により説明する。 An embodiment of the present invention will be described below with reference to FIG.

始動前ＬＰＧ燃料は、燃料ボンベ１より、燃料ボンダ２
内を通り燃料溜３まで充満しており、電磁弁４により通
路を遮断されている。キースイッチがＡＣＣにてコンピ
ューターを駆動させ、燃料溜３内の圧力と温度を圧力変
換器１０と温度変換器１１にて計測し、Ａ／Ｄ変換器１
４にてＡ／Ｄ変換後ＣＰＵ１５にて、演算処理し、ＣＰ
Ｕ内ＲＡＭに燃料組成Ｚと理論空燃比補正係数へを記憶
しておく。圧力と温度により燃料組成を判定する方法は
、プロパンとブタンの燃料蒸気圧（Ｐ（ｓ　、　Ｐｕｓ
　）がＰｆｉ＝−ｆ　（ｔ）　、　Ｐ（ｅ＋　＝　ｇ（
ｔ）とｔ、−、つ温度ｔの指ｆ関数に与えられ、温度ｔ
と圧力により判定出来る。Before starting, LPG fuel is transferred from fuel cylinder 1 to fuel bonder 2.
The passage is filled up to the fuel reservoir 3 through the inside, and the passage is blocked by a solenoid valve 4. The key switch is set to ACC to drive the computer, and the pressure and temperature in the fuel reservoir 3 are measured by the pressure transducer 10 and temperature converter 11, and the A/D converter 1
After A/D conversion in step 4, arithmetic processing is performed in CPU 15, and CP
The fuel composition Z and the stoichiometric air-fuel ratio correction coefficient are stored in the internal RAM. The method of determining fuel composition based on pressure and temperature is based on the fuel vapor pressure of propane and butane (P(s, Pus
) is Pfi=-f (t) , P(e+ = g(
t) and t,−, are given to the finger f function of temperature t, and temperature t
This can be determined by pressure.

例えば、ＬＰＧ液温２０℃にて燃料蒸気圧Ｘｋｇ／ｃｍ
”Ｑの測定値が出ると、２０ｃのプロパンとブタンの燃
料蒸気圧ｔｆ（す２ｇ（りよりそれぞれＡ工Ｉ　Ｅ　ｘ
と求め、Ａよ、Ｂ工より、グロノくンの割合ｙは次式に
て算出される。For example, at LPG liquid temperature of 20°C, fuel vapor pressure of Xkg/cm
``When the measured value of Q is obtained, the fuel vapor pressure tf of propane and butane at 20c (2g)
From A and B, the ratio y of Grono-kun is calculated using the following formula.

Ｘ＝ＡｘＸｙＸ０．０１＋Ｂ、Ｘ　（１００−３’）Ｘ
ｏ、０１ｙ＝Ａ、ｘｌｏｏｘ（Ｘ　　ＢＥ）／（ＡＸ　
　Ｂｘ）　　これを図に示すと第２図のようになる。X=AxXyX0.01+B,X (100-3')X
o, 01y=A, xloox(X BE)/(AX
Bx) This is illustrated in Figure 2.

次に、エンジンが始動すると、電磁弁４が開弁し、燃料
ボンダ２が駆動する。そして、吸入管圧力を圧力変換器
１３にて測定し、エンジン回転数信号にてコイル学ディ
ストリビュータ−より検出しＡ／Ｄ変換器１４にてＡ／
Ｄ震換後ＣＰυ１５にて演算処理し、吸入窒気量を算出
し、基本噴射時間（ＴＢ）を算出する。一方、圧力変換
器１０よりの入力により、圧力補正係数Ｃを、又温度変
換器１１よりの入力とＲＡＭ内の燃料組成より、液比重
を求め液比型補正係数Ｂｆｆｉ算出し、基本噴射時間（
Ｔｎ）に、理論空燃比補正係数Ａと液比型補正係数Ｂと
圧力補正係数Ｃを乗じＴ　＝　Ｔ　Ｂ　Ｘ　Ａ　ＸＢＸ
Ｃを算出し、インジェクター駆動回路１６に（ｎ号金与
え、インジェクター５を開弁制御しラジェーターの温水
にて温められた熱交換器７に噴射され気化しスロットル
チャンバー８の絞弁上流に噴出され、エンジン９に供給
される。Next, when the engine starts, the solenoid valve 4 opens and the fuel bonder 2 is driven. Then, the suction pipe pressure is measured by the pressure transducer 13, the engine rotation speed signal is detected by the coil distributor, and the A/D converter 14 detects the A/D converter 14.
After the D conversion, CPυ15 performs arithmetic processing to calculate the intake nitrogen amount and calculate the basic injection time (TB). On the other hand, the pressure correction coefficient C is determined from the input from the pressure converter 10, and the liquid specific gravity is determined from the input from the temperature converter 11 and the fuel composition in the RAM, and the liquid ratio type correction coefficient Bffi is calculated, and the basic injection time (
Tn) is multiplied by the theoretical air-fuel ratio correction coefficient A, the liquid ratio correction coefficient B, and the pressure correction coefficient C. T = T B X A XBX
C is calculated, and the injector drive circuit 16 is given (n gold), the injector 5 is controlled to open, it is injected into the heat exchanger 7 heated by the hot water of the radiator, it is vaporized, and it is ejected upstream of the throttle valve of the throttle chamber 8. , is supplied to the engine 9.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、補正係数において一番複雑な計算式を
持つ燃料組成の算出をエンジン始動前に行い、ＲＡＭに
メモリーシておくことで、補正計算時間を大幅に短縮出
来かつ、燃料ポンプを用いたシステムにおいても、一対
の圧力と温１ｉＣ７）センサーにて、三つの補正係数全
算出制御出来る。又、ＬＰＧは燃料組成、温度により圧
力が変化するが、燃料組成はＬＰＧ燃料が給油されない
かぎり変化がなく、始動前の値にてエンジン駆動後、そ
の補正係数及び組成値を使用しても問題なく、短い時間
で、補正計算が出来、容易に正確な市１）御カニ可能と
なる。According to the present invention, by calculating the fuel composition, which has the most complicated calculation formula for the correction coefficient, before starting the engine and storing it in RAM, the correction calculation time can be significantly shortened, and the fuel pump can be In the system used, all three correction coefficients can be calculated and controlled using a pair of pressure and temperature sensors. Also, the pressure of LPG changes depending on the fuel composition and temperature, but the fuel composition does not change unless LPG fuel is refueled, so there is no problem even if you use the correction coefficient and composition value after starting the engine at the value before starting. Correction calculations can be made in a short amount of time, and accurate calculations can be made easily.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例の系統図、第２図はプロパン
とブタンの燃料蒸気圧線し１である。 １・・・燃料ボンベ、２・・・燃料ポンプ、３・・・燃
幣Ｖ溜、４・・・電磁弁、訃・・インジェクター、６・
・・ラジェーター、７・・・熱交換器、８・・・スロッ
トルチャンノ（−１９・・・エンジン、１０・・・圧力
変換２鼻、１１・・・ヤ゛−ミスタ、１２・・・エンジ
ン回転数イハ号、１３・・・圧力変換器、１４・・・Ａ
／Ｄ変換器、１５・・・ＣＰｔ１，１６条１区 乙 竿２図 ＬＰ　　い淑シ昆　（°Ｃ〕 ’ＪＪFIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 shows fuel vapor pressure lines of propane and butane. 1... Fuel cylinder, 2... Fuel pump, 3... Fuel V reservoir, 4... Solenoid valve, Injector, 6...
...Radiator, 7...Heat exchanger, 8...Throttle channel (-19...Engine, 10...Pressure conversion 2 nostrils, 11...Yamister, 12...Engine rotation Number Iha No. 13...Pressure transducer, 14...A
/D converter, 15...CPt1, 16 Article 1 Ward 2 Diagram LP Ishukushikon (°C) 'JJ

Claims (1)

【特許請求の範囲】[Claims] １、燃料噴射弁を備えた液化石油ガス燃料供給装置の燃
料蒸気圧力と温度を計測して、その燃料組成と液比重を
算出し、燃料噴射弁の開弁時間を上記圧力と液比重及び
燃料組成により、補正制御する液化石油ガス内燃機関の
燃料供給装置において、一対の圧力変換器と温度変換器
により、始動前は燃料組成を算出し、始動後は圧力及び
液比重を算出し、補正制御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. Measure the fuel vapor pressure and temperature of the liquefied petroleum gas fuel supply system equipped with a fuel injection valve, calculate the fuel composition and liquid specific gravity, and calculate the opening time of the fuel injection valve by calculating the above pressure, liquid specific gravity, and fuel In a fuel supply system for a liquefied petroleum gas internal combustion engine, a pair of pressure transducers and temperature converters calculate the fuel composition before starting, and after starting, calculate the pressure and liquid specific gravity, and perform correction control based on the composition. A fuel supply device for a liquefied petroleum gas internal combustion engine.
JP58082724A 1983-05-13 1983-05-13 Fuel feed system for liquefied-petroleum-gas internal-combustion engine Pending JPS59208152A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58082724A JPS59208152A (en) 1983-05-13 1983-05-13 Fuel feed system for liquefied-petroleum-gas internal-combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58082724A JPS59208152A (en) 1983-05-13 1983-05-13 Fuel feed system for liquefied-petroleum-gas internal-combustion engine

Publications (1)

Publication Number Publication Date
JPS59208152A true JPS59208152A (en) 1984-11-26

Family

ID=13782358

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58082724A Pending JPS59208152A (en) 1983-05-13 1983-05-13 Fuel feed system for liquefied-petroleum-gas internal-combustion engine

Country Status (1)

Country Link
JP (1) JPS59208152A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030081711A (en) * 2002-04-12 2003-10-22 씨멘스 오토모티브 주식회사 Method for calcluating the ratio of component of lpg fuel
KR100427331B1 (en) * 2001-11-07 2004-04-14 현대자동차주식회사 Fuel feeding controlling method of liquefied petroleum gas vehicle
KR100534786B1 (en) * 2002-05-20 2005-12-07 현대자동차주식회사 Liquified petroleum gas composition modelling method of liquified petroleum gas injection vehicle
KR100612968B1 (en) 2004-06-30 2006-08-14 현대자동차주식회사 Starting control method for engine
KR100671126B1 (en) * 2005-03-16 2007-01-17 르노삼성자동차 주식회사 The Control method how to improve startability in LPG liquid injection system
CN100447395C (en) * 2005-08-31 2008-12-31 现代自动车株式会社 Starting apparatus for liquified petroleum gas injection vehicle and method for controlling the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100427331B1 (en) * 2001-11-07 2004-04-14 현대자동차주식회사 Fuel feeding controlling method of liquefied petroleum gas vehicle
KR20030081711A (en) * 2002-04-12 2003-10-22 씨멘스 오토모티브 주식회사 Method for calcluating the ratio of component of lpg fuel
KR100534786B1 (en) * 2002-05-20 2005-12-07 현대자동차주식회사 Liquified petroleum gas composition modelling method of liquified petroleum gas injection vehicle
KR100612968B1 (en) 2004-06-30 2006-08-14 현대자동차주식회사 Starting control method for engine
KR100671126B1 (en) * 2005-03-16 2007-01-17 르노삼성자동차 주식회사 The Control method how to improve startability in LPG liquid injection system
CN100447395C (en) * 2005-08-31 2008-12-31 现代自动车株式会社 Starting apparatus for liquified petroleum gas injection vehicle and method for controlling the same

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