JP2007064202A - Fuel control method of lpi engine - Google Patents

Fuel control method of lpi engine Download PDF

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JP2007064202A
JP2007064202A JP2006118742A JP2006118742A JP2007064202A JP 2007064202 A JP2007064202 A JP 2007064202A JP 2006118742 A JP2006118742 A JP 2006118742A JP 2006118742 A JP2006118742 A JP 2006118742A JP 2007064202 A JP2007064202 A JP 2007064202A
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fuel
injector
engine
temperature
control method
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JP4195711B2 (en
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Deog Yeor Kim
徳 烈 金
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Hyundai Motor Co
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel control method of an LPI (liquefied petroleum gas injection) engine for calculating an initial fuel supply quantity by taking into consideration fuel remaining in an injector when starting the engine. <P>SOLUTION: This fuel control method is characterized by comprising a stage S20 of sensing the temperature and pressure inside of the injector via a temperature and pressure sensor arranged in the injector, a stage S30 of calculating residual fuel inside of the injector by the temperature and the pressure sensed by the injector, a stage S40 of determining the existence of driving of the engine, a stage S50 of calculating a basic injection quantity of the fuel by taking into consideration the air volume and the temperature of cooling water when driving the engine, and a stage S60 of calculating an initial fuel injection quantity by subtracting a residual fuel quantity inside of the injector from the basic injection quantity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ＬＰＩエンジンの燃料制御方法に係り、より詳しくはエンジンの始動時にインジェクターに残留した燃料を勘案して初期燃料供給量を計算するＬＰＩエンジンの燃料制御方法に関する。 The present invention relates to a fuel control method for an LPI engine, and more particularly to a fuel control method for an LPI engine that calculates an initial fuel supply amount in consideration of fuel remaining in an injector when the engine is started.

一般に、ＬＰＧは液状から気体に変化する場合、体積が約２５０倍以上増加するので、気体の燃料を噴射すれば、燃料不足による始動性悪化または始動が消える現象が発生する。
そして、従来のＬＰＧエンジンは、液体状態のＬＰＧを気化させてから空気を混合して燃焼室に噴射するミキサー方式であるので、冬には始動不良やタール発生などの問題点が生じ、未燃焼燃料が吸気管方向に逆流して吸気管内部で燃焼する逆火現象が発生する危険が高い。
しかし、液状燃料噴射エンジン（以下、ＬＰＩエンジンという）は、ＬＰＧ燃料の気化過程なしに液体状態のＬＰＧをシリンダー内部に直接噴射するので、効率的な構造でありながら既存のＬＰＧエンジンの諸般問題点を大幅に改善する。
一方、エンジンのシリンダー内部に残留燃料がある場合、始動過程で目標燃料量以上に供給された燃料によって不完全燃焼が発生し、これによって排気ガスが増加するという問題点がある。
特開２００３−２０６８３２号公報 In general, when LPG changes from liquid to gas, the volume increases by about 250 times or more. Therefore, if gaseous fuel is injected, startability deteriorates due to fuel shortage or the start disappears.
The conventional LPG engine is a mixer system that vaporizes LPG in a liquid state and then mixes the air and injects it into the combustion chamber. This causes problems such as poor starting and tar generation in winter. There is a high risk of a backfire phenomenon in which fuel flows backward in the direction of the intake pipe and burns inside the intake pipe.
However, the liquid fuel injection engine (hereinafter referred to as LPI engine) directly injects liquid LPG into the cylinder without the LPG fuel vaporization process. Greatly improved.
On the other hand, when there is residual fuel inside the cylinder of the engine, there is a problem that incomplete combustion occurs due to the fuel supplied in excess of the target fuel amount during the starting process, thereby increasing the exhaust gas.
JP 2003-206832 A

本発明は、前記問題点を解決するためになされたものであって、本発明の目的は、エンジン始動時にインジェクターに残留した燃料を勘案して初期燃料供給量を計算するＬＰＩエンジンの燃料制御方法を提供することである。 The present invention has been made to solve the above problems, and an object of the present invention is to provide a fuel control method for an LPI engine that calculates an initial fuel supply amount in consideration of fuel remaining in an injector when the engine is started. Is to provide.

前記技術的課題を解決するための本発明によるＬＰＩエンジンの燃料制御方法は、インジェクターに設置された温度および圧力センサーを通じてインジェクター内部の温度および圧力を感知する段階（Ｓ２０）と、前記インジェクターで感知された温度および圧力によって前記インジェクター内部の残留燃料を計算する段階（Ｓ３０）と、エンジンの駆動有無を判断する段階（Ｓ４０）と、前記エンジンが駆動する場合、空気量及び冷却水の温度を考慮して燃料の基本噴射量を計算する段階（Ｓ５０）と、前記基本噴射量から前記インジェクター内部の残留燃料量を差し引いて初期燃料噴射量を計算する段階（Ｓ６０）とを含んで構成されることを特徴とする。 The fuel control method of the LPI engine according to the present invention for solving the technical problem is to sense the temperature and pressure inside the injector through a temperature and pressure sensor installed in the injector (S20), and to be detected by the injector. Calculating the residual fuel in the injector based on the temperature and pressure (S30), determining whether the engine is driven (S40), and when the engine is driven, consider the air amount and the temperature of the cooling water. And calculating the basic fuel injection amount (S50) and subtracting the residual fuel amount in the injector from the basic injection amount to calculate the initial fuel injection amount (S60). Features.

ここで、前記インジェクターには電子遮断バルブが設置され、エンジン停止時に前記電子遮断バルブによってＬＰＩエンジンのシリンダーに供給される燃料が遮断される。
一方、前記インジェクターの内部には温度および圧力を感知する温度および圧力センサーが各々設置され、前記温度および圧力センサーで感知されたデータは車両の電子制御ユニット（図示なし）に伝達される。
これと共に、前記ＬＰＩエンジンの燃料制御方法は、エンジンの始動時にインジェクター内部の残留燃料量を計算することを特徴とする。 Here, an electronic cutoff valve is installed in the injector, and fuel supplied to the cylinder of the LPI engine is shut off by the electronic cutoff valve when the engine is stopped.
On the other hand, temperature and pressure sensors for detecting temperature and pressure are installed inside the injector, and data sensed by the temperature and pressure sensor is transmitted to an electronic control unit (not shown) of the vehicle.
Along with this, the fuel control method of the LPI engine is characterized in that the residual fuel amount inside the injector is calculated when the engine is started.

本発明によるＬＰＩエンジンの燃料制御方法は、初期始動時にインジェクターに残留した燃料の量を勘案して初期噴射量を計算するので、過度な燃料によって排気ガスが発生することを防止できるという効果がある。
また、インジェクターに設置された温度および圧力センサーを通じて感知された値からインジェクターに残留した燃料の量を計算するので、より正確な残留量を感知することができ、これによってＬＰＩエンジンの最適空燃比を実現できる効果がある。 The fuel control method for an LPI engine according to the present invention calculates the initial injection amount in consideration of the amount of fuel remaining in the injector at the time of initial start, so that it is possible to prevent the exhaust gas from being generated by excessive fuel. .
In addition, since the amount of fuel remaining in the injector is calculated from the values sensed through the temperature and pressure sensors installed in the injector, it is possible to more accurately sense the remaining amount, thereby determining the optimum air-fuel ratio of the LPI engine. There is an effect that can be realized.

以下、本発明による好ましい実施形態を図面を参照して詳細に説明する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

図１は本発明によるＬＰＩエンジン１０の燃料供給システムの構成図であり、図２（Ａ）及び図２（Ｂ）は本発明によるＬＰＩエンジン１０に使用されるインジェクター１２の概略図であり、図３は本発明によるＬＰＩエンジン１０の燃料制御方法を示すフローチャートである。
本発明によるＬＰＩエンジン１０の燃料供給システムは、図１に示すように、燃料が保存されるボンベ２と、ボンベ２の内部に設置されて液状燃料をポンピングする燃料ポンプ４と、ポンピングされた燃料を噴射させて駆動されるＬＰＩエンジン１０と、燃料ポンプ４でポンピングされた燃料をＬＰＩエンジン１０に案内する燃料供給ライン８を含んで構成される。 FIG. 1 is a configuration diagram of a fuel supply system of an LPI engine 10 according to the present invention, and FIGS. 2A and 2B are schematic views of an injector 12 used in the LPI engine 10 according to the present invention. 3 is a flowchart showing a fuel control method of the LPI engine 10 according to the present invention.
As shown in FIG. 1, a fuel supply system for an LPI engine 10 according to the present invention includes a cylinder 2 in which fuel is stored, a fuel pump 4 that is installed inside the cylinder 2 and pumps liquid fuel, and a pumped fuel. And an LPI engine 10 that is driven by injecting fuel and a fuel supply line 8 that guides the fuel pumped by the fuel pump 4 to the LPI engine 10.

ＬＰＩエンジン１０の燃料供給システムでは、ボンベ２内の液状のＬＰＧ燃料をボンベ２内の燃料ポンプ４によってポンピングし、燃料ポンプ４によってポンピングされたＬＰＧ燃料をマルチバルブ６を通じて燃料供給ライン８に送る。供給された燃料はＬＰＩエンジン１０のインジェクター１２を通じてＬＰＩエンジン１０内部の燃焼室に噴射される。
一方、燃料供給時に余ったＬＰＧ燃料は、インジェクター１２から燃料リターンライン２０を通じてボンベ２にリターンされる。 In the fuel supply system of the LPI engine 10, liquid LPG fuel in the cylinder 2 is pumped by the fuel pump 4 in the cylinder 2, and the LPG fuel pumped by the fuel pump 4 is sent to the fuel supply line 8 through the multi-valve 6. The supplied fuel is injected into the combustion chamber inside the LPI engine 10 through the injector 12 of the LPI engine 10.
On the other hand, surplus LPG fuel at the time of fuel supply is returned from the injector 12 to the cylinder 2 through the fuel return line 20.

燃料ポンプ４は、ＬＰＧ燃料がボンベ２からインジェクター１２に圧送されるまで液体状態を維持することができるように、ＬＰＧ燃料の液化に必要な圧力以上に加圧する。
燃料供給ライン８にはエンジン停止時にＬＰＧ燃料の供給を遮断するための燃料供給遮断バルブ２２、２３及びＬＰＧ燃料の温度を測定するための温度センサー２４が設置される。
これとともに燃料リターンライン２０にはＬＰＧ燃料の圧力を測定するための圧力センサー２６及びＬＰＧ燃料の圧力を一定の水準に維持するための圧力調節器２８が設置される。 The fuel pump 4 pressurizes more than the pressure required for liquefying the LPG fuel so that the LPG fuel can be maintained in a liquid state until it is pumped from the cylinder 2 to the injector 12.
The fuel supply line 8 is provided with fuel supply shutoff valves 22 and 23 for shutting off the supply of LPG fuel when the engine is stopped, and a temperature sensor 24 for measuring the temperature of the LPG fuel.
Along with this, a pressure sensor 26 for measuring the pressure of the LPG fuel and a pressure regulator 28 for maintaining the pressure of the LPG fuel at a certain level are installed in the fuel return line 20.

本発明によるインジェクター１２には図２（Ａ）及び図２（Ｂ）に示すように、液状燃料が噴射される経路上に電子遮断バルブ５０及び温度および圧力センサー５２、５４が設置される。
ここで、温度および圧力センサー５２、５４で感知されたデータは、車両の電子制御ユニットに伝達される。
ＬＰＩエンジン１０が停止した場合、電子制御ユニットは電子遮断バルブ５０を作動させて、燃料供給ライン８で供給される燃料がエンジンのシリンダーに流入するのを遮断し、電子制御ユニットの作動によってインジェクター１２内部には燃料が残留する。 As shown in FIGS. 2A and 2B, the injector 12 according to the present invention is provided with an electronic shutoff valve 50 and temperature and pressure sensors 52 and 54 on a path through which liquid fuel is injected.
Here, the data sensed by the temperature and pressure sensors 52, 54 is transmitted to the electronic control unit of the vehicle.
When the LPI engine 10 is stopped, the electronic control unit operates the electronic shutoff valve 50 to shut off the fuel supplied through the fuel supply line 8 from flowing into the cylinder of the engine, and the injector 12 is activated by the operation of the electronic control unit. Fuel remains inside.

以下、本発明によるＬＰＩエンジン１０の制御方法を図１〜図３を参照して詳細に説明する。
本発明によるＬＰＩエンジン１０の制御方法は、始動キー（ＩＧ）がオンされる段階（Ｓ１０）と、インジェクター１２に設置された温度および圧力センサーを通じてインジェクター内部の温度および圧力を感知する段階（Ｓ２０）と、インジェクター１２で感知された温度および圧力によってインジェクター１２内部の残留燃料を計算する段階（Ｓ３０）と、ＬＰＩエンジン１０の駆動有無を判断する段階（Ｓ４０）と、ＬＰＩエンジン１０が駆動する場合、空気量及び冷却水の温度を考慮して燃料の基本噴射量を計算する段階（Ｓ５０）と、基本噴射量からインジェクター内部の残留燃料量を差し引いて初期燃料噴射量を計算する段階（Ｓ６０）とを含んで構成される。 Hereinafter, a method for controlling the LPI engine 10 according to the present invention will be described in detail with reference to FIGS.
The method of controlling the LPI engine 10 according to the present invention includes a step of turning on a start key (IG) (S10) and a step of sensing temperature and pressure inside the injector through a temperature and pressure sensor installed in the injector 12 (S20). And calculating the residual fuel in the injector 12 based on the temperature and pressure detected by the injector 12 (S30), determining whether the LPI engine 10 is driven (S40), and when the LPI engine 10 is driven, A step of calculating the basic fuel injection amount in consideration of the air amount and the cooling water temperature (S50), and a step of subtracting the residual fuel amount inside the injector from the basic injection amount to calculate the initial fuel injection amount (S60). It is comprised including.

ここで、始動キーがオンされた後、電子制御ユニットはインジェクター１２に設置された温度および圧力センサー５２、５４でインジェクター１２内部の温度および圧力を感知する。インジェクター１２の内部は一定の空間を形成しているので、感知された温度および圧力値を通じてインジェクター１２内部に残留した燃料の量を計算する。 Here, after the start key is turned on, the electronic control unit senses the temperature and pressure inside the injector 12 with temperature and pressure sensors 52 and 54 installed in the injector 12. Since the inside of the injector 12 forms a certain space, the amount of fuel remaining in the injector 12 is calculated through the sensed temperature and pressure values.

すなわち、インジェクター１２内部に残留した燃料量による温度および圧力に関する実験値は電子制御ユニットに保存され、電子制御ユニットはインジェクター１２内部で感知された温度および圧力値を通じて残留した燃料量を計算する（Ｓ３０）。
そして、ＬＰＩエンジン１０が駆動する場合、電子制御ユニットはＬＰＩエンジン１０に供給する燃料の量を計算する。
ここで、ＬＰＩエンジン１０に過剰の燃料が供給される場合には、多量の排気ガスが発生し、供給される燃料が少ない場合には、エンジンの出力が低下する。 That is, experimental values related to temperature and pressure due to the amount of fuel remaining in the injector 12 are stored in the electronic control unit, and the electronic control unit calculates the amount of remaining fuel through the temperature and pressure values sensed in the injector 12 (S30). ).
When the LPI engine 10 is driven, the electronic control unit calculates the amount of fuel supplied to the LPI engine 10.
Here, when excessive fuel is supplied to the LPI engine 10, a large amount of exhaust gas is generated, and when the supplied fuel is small, the output of the engine is reduced.

本発明によるＬＰＩエンジン１０の制御方法では、インジェクター１２内部に残留した燃料によって発生する排気ガスを低下させるために、基本燃料供給量からインジェクター１２内部に残留した燃料の量だけ差し引く。
すなわち、電子制御ユニットはＬＰＩエンジン１０に供給される空気量及び冷却水の温度を考慮して燃料の基本噴射量を計算し（Ｓ５０）、基本噴射量から残留燃料量を差し引いて初期燃料噴射量を計算する（Ｓ６０）。
そして、残留燃料を差し引いて計算された初期燃料噴射量は、インジェクター１２を通じてＬＰＩエンジン１０のシリンダー内部に噴射されて空燃比（空気／燃料量）を最適化させる。 In the control method of the LPI engine 10 according to the present invention, the amount of fuel remaining in the injector 12 is subtracted from the basic fuel supply amount in order to reduce the exhaust gas generated by the fuel remaining in the injector 12.
That is, the electronic control unit calculates the basic fuel injection amount in consideration of the air amount supplied to the LPI engine 10 and the temperature of the cooling water (S50), and subtracts the residual fuel amount from the basic injection amount to obtain the initial fuel injection amount. Is calculated (S60).
The initial fuel injection amount calculated by subtracting the residual fuel is injected into the cylinder of the LPI engine 10 through the injector 12 to optimize the air-fuel ratio (air / fuel amount).

本発明によるＬＰＩエンジンの燃料供給システムの構成図である。It is a block diagram of the fuel supply system of the LPI engine by this invention. （Ａ）及び（Ｂ）は本発明によるＬＰＩエンジンに使用されるインジェクターの概略図である。(A) And (B) is the schematic of the injector used for the LPI engine by this invention. 本発明によるＬＰＩエンジンの燃料制御方法を示すフローチャートである。3 is a flowchart illustrating a fuel control method for an LPI engine according to the present invention.

符号の説明Explanation of symbols

２ ボンベ
４ 燃料ポンプ
６ マルチバルブ
８ 燃料供給ライン
１０ ＬＰＩエンジン
１２ インジェクター
２２、２３ 燃料供給遮断バルブ
２４ 温度センサー
５０ 電子遮断バルブ
５２ 温度センサー
５４ 圧力センサー


2 cylinder 4 fuel pump 6 multi-valve 8 fuel supply line 10 LPI engine 12 injectors 22, 23 fuel supply shut-off valve 24 temperature sensor 50 electronic shut-off valve 52 temperature sensor 54 pressure sensor


Claims (4)

インジェクターに設置された温度および圧力センサーを通じてインジェクター内部の温度および圧力を感知する段階（Ｓ２０）と、
前記インジェクターで感知された温度および圧力によって前記インジェクター内部の残留燃料を計算する段階（Ｓ３０）と、
エンジンの駆動有無を判断する段階（Ｓ４０）と、
前記エンジンが駆動する場合、空気量及び冷却水の温度を考慮して燃料の基本噴射量を計算する段階（Ｓ５０）と、
前記基本噴射量から前記インジェクター内部の残留燃料量を差し引いて初期燃料噴射量を計算する段階（Ｓ６０）と、
を含んで構成されることを特徴とするＬＰＩエンジンの燃料制御方法。 Sensing the temperature and pressure inside the injector through a temperature and pressure sensor installed in the injector (S20);
Calculating a residual fuel inside the injector according to a temperature and a pressure sensed by the injector (S30);
Determining whether the engine is driven (S40);
When the engine is driven, calculating a basic fuel injection amount in consideration of the air amount and the coolant temperature (S50);
Subtracting the residual fuel amount inside the injector from the basic injection amount to calculate an initial fuel injection amount (S60);
A fuel control method for an LPI engine, comprising: 前記インジェクターには電子遮断バルブが設置され、エンジン停止時に前記電子遮断バルブによってＬＰＩエンジンのシリンダーに供給される燃料が遮断されることを特徴とする請求項１に記載のＬＰＩエンジンの燃料制御方法。 The fuel control method for an LPI engine according to claim 1, wherein an electronic cutoff valve is installed in the injector, and fuel supplied to a cylinder of the LPI engine is shut off by the electronic cutoff valve when the engine is stopped. 前記インジェクターの内部には温度および圧力を感知する温度および圧力センサーが各々設置され、前記温度および圧力センサーで感知されたデータは車両の電子制御ユニットに伝達されることを特徴とする請求項１または請求項２に記載のＬＰＩエンジンの燃料制御方法。 The temperature and pressure sensors for detecting temperature and pressure are respectively installed in the injector, and data detected by the temperature and pressure sensors is transmitted to an electronic control unit of a vehicle. The fuel control method for an LPI engine according to claim 2. 前記ＬＰＩエンジンの燃料制御方法は、エンジンの始動時にインジェクター内部の残留燃料量を計算することを特徴とする請求項１または請求項２に記載のＬＰＩエンジンの燃料制御方法。 3. The fuel control method for an LPI engine according to claim 1, wherein the fuel control method for the LPI engine calculates a residual fuel amount inside the injector when the engine is started. 4.
JP2006118742A 2005-08-30 2006-04-24 Fuel control method for LPI engine Expired - Fee Related JP4195711B2 (en)

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