JP2014020334A - Ignition control method for alternative fuel engine - Google Patents

Ignition control method for alternative fuel engine Download PDF

Info

Publication number
JP2014020334A
JP2014020334A JP2012162130A JP2012162130A JP2014020334A JP 2014020334 A JP2014020334 A JP 2014020334A JP 2012162130 A JP2012162130 A JP 2012162130A JP 2012162130 A JP2012162130 A JP 2012162130A JP 2014020334 A JP2014020334 A JP 2014020334A
Authority
JP
Japan
Prior art keywords
ignition
gasoline
alternative fuel
signal
engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2012162130A
Other languages
Japanese (ja)
Other versions
JP6154998B2 (en
Inventor
Yoshiyuki Ando
芳之 安藤
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.)
Nikki Co Ltd
Original Assignee
Nikki Co Ltd
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 Nikki Co Ltd filed Critical Nikki Co Ltd
Priority to JP2012162130A priority Critical patent/JP6154998B2/en
Publication of JP2014020334A publication Critical patent/JP2014020334A/en
Application granted granted Critical
Publication of JP6154998B2 publication Critical patent/JP6154998B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • Y02T10/40—Engine management systems

Abstract

PROBLEM TO BE SOLVED: To control ignition of a gasoline alternative fuel engine even if engine revolution changes so rapidly that ignition control of gasoline alternative fuel is difficult.SOLUTION: In an ignition control method for an alternative fuel engine, regardless of acceleration or deceleration of an engine speed, at all times, either an ignition coil energization start signal for ignition for gasoline or that for alternative fuel, which is preceded, starts energization of an ignition coil, and either an ignition signal for gasoline or that for gasoline alternative fuel, which is preceded, stops the energization of the ignition coil to produce ignition.

Description

本発明は、ガソリンエンジンをＬＰＧやＣＮＧなどのガソリン代替燃料用に改造する場合における、ガソリン代替燃料エンジンの点火制御方法およびその装置に関するものである。   The present invention relates to an ignition control method for a gasoline alternative fuel engine and an apparatus therefor when the gasoline engine is modified for a gasoline alternative fuel such as LPG or CNG.

組成・気化性等の特性がガソリンとは異なるＬＰＧ等のガソリン代替燃料を、電流遮断式の点火装置を有する火花点火エンジンの燃料に使用することは広く知られており、ガソリンとは特性の異なるガソリン代替燃料をインジェクタから吸気管路に噴射する噴射システムをエンジンに搭載するにあたり、エンジンの運転状態に応じて最適の燃料供給量を与える噴射量としてガソリン噴射システムを構成する電子制御ユニットに設定されているガソリン噴射システムを搭載している既存のエンジンに対しては、例えば特開２００３−２０６７７３号公報に記載されているように、入力されたガソリン噴射量に基いてこれと同等の混合気を与える燃料噴射量を種々のデータを用いて所定の計算式で算出する、というきわめて簡単な機能をもたせたガソリン代替燃料用の電子制御ユニットを増設することで、既存のガソリン噴射システムをそのまま利用してガソリン代替燃料噴射システムを構築し、使用する燃料に対応したエンジンに改造することができる。   It is widely known that gasoline alternative fuels such as LPG, whose characteristics such as composition and vaporization are different from gasoline, are used for the fuel of a spark ignition engine having a current interruption type ignition device. When the engine is equipped with an injection system that injects gasoline alternative fuel from the injector into the intake pipe, it is set in the electronic control unit that constitutes the gasoline injection system as an injection amount that gives the optimum fuel supply amount according to the operating state of the engine. For an existing engine equipped with a gasoline injection system, an air-fuel mixture equivalent to this is based on the input gasoline injection amount, as described in, for example, JP-A-2003-206773. A very simple function of calculating the amount of fuel injection to be given with various data using a predetermined formula By adding the electronic control unit for Sorin alternative fuel, and it utilizes the existing petrol injection system builds a gasoline alternative fuel injection system, it is possible to modify the engine corresponding to the fuel used.

図５は、このような従来のエンジンの燃料噴射システムの配置図を示したもので、ガソリン代替燃料エンジンの点火制御装置を兼ねたガソリン代替燃料噴射制御用の電子制御ユニット３とガソリン代替燃料用のインジェクタ４をエンジン既設のガソリン噴射システムに増設したガソリン代替燃料噴射システムを示す配置図であり、クランク軸回転センサ７、カム軸回転センサ８、吸入空気量センサ９、スロットル開度センサ１０、ノックセンサ１１、エンジン冷却水温度センサ１２により検出したエンジン運転状態を示す各データに基いて算出したガソリン噴射信号を出力し、改造前においてガソリン用インジェクタをこの噴射信号に応じたデューティサイクルで開閉動作させてエンジン要求流量のガソリンを噴射してエンジン１に供給し、且つ、イグナイタ内蔵の点火装置６に最適なタイミングで点火信号を出力する既設のガソリン用電子制御ユニット２を、代替燃料用に改造したエンジン１に対応させるため代替するガソリン代替燃料用の電子制御ユニット３を増設し、ガソリン噴射信号Ｂを電子制御ユニット３の入力ポートＪで受信させ、その内部で代替燃料に適した補正を行い、ガソリン代替燃料用のインジェクタ駆動信号Ｋを出力してインジェクタ４を駆動制御するものとして、改造後においても高精度の排気性能を確保しようとするものである。   FIG. 5 shows a layout of such a conventional engine fuel injection system. An electronic control unit 3 for gasoline alternative fuel injection control, which also serves as an ignition control device for a gasoline alternative fuel engine, and an alternative fuel for gasoline. 1 is a layout diagram showing a gasoline alternative fuel injection system in which an injector 4 of this type is added to an existing gasoline injection system, and includes a crankshaft rotation sensor 7, a camshaft rotation sensor 8, an intake air amount sensor 9, a throttle opening sensor 10, a knock The gasoline injection signal calculated based on each data indicating the engine operating state detected by the sensor 11 and the engine coolant temperature sensor 12 is output, and the gasoline injector is opened and closed at a duty cycle corresponding to the injection signal before remodeling. To inject gasoline at the required flow rate to the engine 1, In addition, an electronic control unit for gasoline alternative fuel that replaces the existing gasoline electronic control unit 2 that outputs an ignition signal at an optimal timing for the ignition device 6 with a built-in igniter to correspond to the engine 1 modified for alternative fuel. 3 is added, the gasoline injection signal B is received at the input port J of the electronic control unit 3, the correction suitable for the alternative fuel is performed therein, and the injector drive signal K for the alternative gasoline fuel is output to output the injector 4. In order to control the drive, high-precision exhaust performance is to be secured even after modification.

しかしながら、この従来技術においてＬＰＧやＣＮＧのようにガソリンとは燃焼速度が顕著に異なる代替燃料の場合は図６のグラフに示すように良好な熱効率を示す点火時期が大きく異なることから、ガソリンエンジンで最適に設定された点火時期Ｔ２３をそのまま改造後のエンジンに適用すると、代替燃料に最適な点火時期Ｔ２５に設定した場合と比べて熱効率が悪化するなどの問題がある。   However, in the case of alternative fuels such as LPG and CNG, which have a combustion rate that is significantly different from that of gasoline in this prior art, the ignition timing showing good thermal efficiency is greatly different as shown in the graph of FIG. When the optimally set ignition timing T23 is applied to the engine after modification as it is, there is a problem that the thermal efficiency is deteriorated as compared with the case where the optimal ignition timing T25 is set for the alternative fuel.

これらの問題に対して、図７に示すように、ガソリン用の電子制御ユニット２と点火装置６とを接続する配線を切断し、その代わりにガソリン代替燃料用の電子制御ユニット３内部で計算した点火時期および通電角を送信する配線を点火装置６に接続することで、エンジン性能を良好に発揮させる手段が考えられる。   To solve these problems, as shown in FIG. 7, the wiring connecting the electronic control unit 2 for gasoline and the ignition device 6 was cut, and instead, the calculation was performed inside the electronic control unit 3 for gasoline alternative fuel. By connecting the wiring for transmitting the ignition timing and the energization angle to the ignition device 6, there can be considered a means for satisfactorily exhibiting the engine performance.

ところが、この電子制御ユニット３による点火制御においては。図８の点火制御に関するブロック図に示すように、エンジン負荷情報を検知するための吸入空気量センサ信号Ｃの入力、適切なタイミングで点火波形を生成処理（図８，３２２）するためのクランク軸回転センサ信号Ｅ，カム軸回転センサ信号Ｆ等の入力が不可欠となるため、代替燃料用の電子制御ユニット３に多くの入力ポートが必要となってその構成が複雑となりやすい。また、電子制御ユニット３内で点火時期基本値を演算するために、エンジンのあらゆる運転条件を実験確認に基いて設定する必要が生じる。そのため、実験確認および設定工数が増加して電子制御ユニット３に関する設定・製造の手間が嵩み、そのためにコストアップを伴うという問題がある。   However, in the ignition control by the electronic control unit 3. As shown in the block diagram relating to ignition control in FIG. 8, an intake air amount sensor signal C for detecting engine load information is input, and a crankshaft for generating an ignition waveform (FIG. 8, 322) at an appropriate timing. Since the input of the rotation sensor signal E, the camshaft rotation sensor signal F, etc. is indispensable, the electronic control unit 3 for alternative fuel needs many input ports and its configuration is likely to be complicated. Further, in order to calculate the ignition timing basic value in the electronic control unit 3, it is necessary to set all operating conditions of the engine based on experimental confirmation. For this reason, there is a problem in that the labor for setting and manufacturing the electronic control unit 3 is increased due to an increase in experiment confirmation and setting man-hours, resulting in an increase in cost.

そこで、ガソリンエンジンをガソリン代替燃料エンジンに改造する場合に、追加する代替燃料用の電子制御ユニットの設定・製造に要する手間を軽減し低コストで点火時期制御を的確に行えるようにする目的で、ガソリンエンジンをガソリン燃料とは最適な点火時期が異なるガソリン代替燃料用のエンジンに改造する場合に、ガソリン代替燃料用電子制御ユニットが検知したガソリン用点火信号を基にガソリン代替燃料の特性に応じて決定した点火時期修正時間で点火時期を前後に調整する、という比較的簡易な手段を採用したことにより、ガソリン代替燃料に最適な点火制御を比較的容易に実現できるガソリン代替燃料エンジンの点火制御方法が特開２００８−１４２５８号公報に提示されている。   Therefore, when remodeling a gasoline engine to a gasoline alternative fuel engine, in order to reduce the effort required for setting and manufacturing an electronic control unit for the alternative fuel to be added and to accurately perform ignition timing control at a low cost, When remodeling a gasoline engine to an engine for gasoline alternative fuel that has a different optimal ignition timing from that of gasoline fuel, depending on the characteristics of the gasoline alternative fuel based on the gasoline ignition signal detected by the electronic control unit for gasoline alternative fuel Ignition control method for gasoline alternative fuel engine that can realize ignition control optimal for gasoline alternative fuel relatively easily by adopting relatively simple means of adjusting ignition timing back and forth with determined ignition timing correction time Is disclosed in Japanese Patent Application Laid-Open No. 2008-14258.

この公報に提示されているガソリン代替燃料エンジンの点火制御方法は、例えば図９に示すように、最終点火時期修正通電角度（δ）＜０の場合には、対象となる一つ前の気筒のガソリン用点火信号（５Ｎ１）の立上り・立下り時間ｔｄｗを計測し、その立下りタイミング（８１）で、ｔ４＝−ｔ１、ｔ３＝ｔｄｗの計算を実行する（６０３）。そして、対象気筒のガソリン用点火信号（５Ｐ０）を立ち上げ、ｔ３時間の間通電させる。これにより、ガソリン用点火信号の点火装置６への通電時間φが一定だとすると、φ＝ｔｄｗより、ガソリン用点火信号の点火立下り（８４）よりも代替燃料用点火信号の立下り（８５）が−ｔ１時間遅れるため、狙い通りガソリン用点火信号よりもδ分、遅角側に点火時期を設定することができ、図１０に示すように、最終点火時期修正通電角度（δ）＞０の場合には、対象となる二つ前の気筒のガソリン用点火信号（５Ｎ２）の立下り（９１）と、一つ前の気筒の立下り（９２）の時間ｔ５と、一つ前の気筒（５Ｎ１）のガソリン用点火信号の点火通電時間ｔｄｗを計測し、点火立下り（９２）のタイミングで、ｔ２＝ｔ５−ｔｄｗ−ｔ１を計算する。そして、この立下りタイミング（９２）よりもｔ２時間経過した後、代替燃料の点火信号（５Ｐ０）をｔｄｗの間通電する。これにより、ガソリン用点火信号の点火装置６への通電時間が一定だとすると、φ＝ｔｄｗより、ガソリン用点火信号の立下り（９５）よりもｔ１時間前に代替燃料用点火信号が立ち下がる（９４）ため、狙い通りガソリンよりもδだけ進角側に点火時期をずらして設定することができる。   For example, as shown in FIG. 9, the ignition control method of the gasoline alternative fuel engine presented in this publication is applied to the cylinder in front of the target when the final ignition timing correction energization angle (δ) <0. The rise / fall time tdw of the gasoline ignition signal (5N1) is measured, and t4 = −t1 and t3 = tdw are calculated at the fall timing (81) (603). Then, the gasoline ignition signal (5P0) of the target cylinder is raised and energized for t3 hours. Thus, assuming that the energization time φ of the gasoline ignition signal to the ignition device 6 is constant, the fall (85) of the alternative fuel ignition signal is less than the ignition fall (84) of the gasoline ignition signal from φ = tdw. Since -t1 time is delayed, the ignition timing can be set to the retarded side by δ minutes from the gasoline ignition signal as intended. When final ignition timing correction energization angle (δ)> 0 as shown in FIG. Includes a fall (91) of the gasoline ignition signal (5N2) of the two previous cylinders, a time t5 of the fall (92) of the previous cylinder, and the previous cylinder (5N1). The ignition energization time tdw of the gasoline ignition signal is measured, and t2 = t5−tdw−t1 is calculated at the timing of ignition fall (92). Then, after t2 hours have elapsed from the falling timing (92), the ignition signal (5P0) of the alternative fuel is energized for tdw. Thus, assuming that the energization time of the gasoline ignition signal to the ignition device 6 is constant, the alternative fuel ignition signal falls at time t1 before the fall of the gasoline ignition signal (95) from φ = tdw (94 Therefore, the ignition timing can be set to be shifted to the advance side by δ as compared with the gasoline as intended.

しかしながら、前記特開２００８−１４２５８号公報に提示されているガソリン代替燃料エンジンの点火制御方法において、エンジン加減速状態の急激な変化、即ち、前記公報に対しされている点火時期の調整が可能な範囲を超えるような急激なエンジンの回転変動があった場合には代替燃料用点火信号が遅れてしまい失火（ミスファイア）してしまうという問題が生じることになる。殊に、ガソリン代替用エンジン燃料は、気化させたガソリン燃料に比べて燃焼にくいという性質を有しているので点火時期が遅れると失火する原因となり、特に、エンジン回転の変化を検知して点火時期を調整するものであることから、特に、急激に回転が上昇した場合には制御が追いつかなくなるという問題がある。   However, in the ignition control method for a gasoline alternative fuel engine presented in Japanese Patent Application Laid-Open No. 2008-14258, a rapid change in the engine acceleration / deceleration state, that is, the adjustment of the ignition timing described in the publication can be made. If there is a sudden engine rotation fluctuation exceeding the range, the alternative fuel ignition signal will be delayed, resulting in a problem of misfire. In particular, gasoline-substitute engine fuel has the property that it is harder to burn than vaporized gasoline fuel, so it may cause misfire if the ignition timing is delayed. Therefore, there is a problem that the control cannot catch up particularly when the rotation rapidly increases.

特開２００３−２０６７７３号公報JP 2003-206773 A 特開２００８−１４２５８号公報JP 2008-14258 A

本発明は、前記課題を解決するためになされたものであり、特に、従来のガソリン代替燃料用電子制御ユニットが検知したガソリン用点火信号を基にガソリン代替燃料の特性に応じて決定した点火時期修正時間で点火時期を前後に調整する、という手段ではガソリン代替燃料の点火制御が困難な程にエンジンの回転が急激に変化した場合にもガソリン代替燃料エンジンの点火制御を行うことが可能なガソリン代替燃料エンジンの点火制御方法およびその装置を提供するものである。   The present invention has been made to solve the above-mentioned problems, and in particular, ignition timing determined according to characteristics of gasoline alternative fuel based on a gasoline ignition signal detected by a conventional gasoline alternative fuel electronic control unit. Gasoline that can perform ignition control of a gasoline alternative fuel engine even when the engine speed changes so rapidly that ignition control of the gasoline alternative fuel is difficult by adjusting the ignition timing back and forth with a correction time An alternative fuel engine ignition control method and apparatus are provided.

前記課題を解決するための、本発明は、エンジン運転状態に応じてガソリン用電子制御ユニットが出力するガソリン噴射信号を受信し該ガソリン噴射信号を基にガソリン代替燃料の噴射量を算出して点火装置のインジェクタに駆動信号を出力するガソリン代替燃料用電子制御ユニットをエンジンに既設のガソリン噴射システムに増設するとともに、前記ガソリン代替燃料用電子制御ユニットが、前記ガソリン用電子制御ユニットの出力するガソリン用点火信号を受信し、所定の方法で求めた点火時期修正時間で前記ガソリン用点火信号による点火時期のタイミングを調整することにより、ガソリン代替燃料に適合させたガソリン代替用点火信号を生成・出力して点火コイルによる点火を制御するガソリン代替燃料エンジンの点火制御方法において、前記点火装置が電流遮断式であって、エンジン回転数の加減速に拘わらず、常時ガソリン点火用の点火コイル通電開始信号と、代替燃料の通電開始信号が入力されるＲＳフリップフロップ回路の出力として生成・出力してどちらか先に発生した信号で前記点火装置の点火コイルの通電を開始し、ガソリン点火用の点火コイル通電開始信号と、代替燃料の通電開始信号が入力されるＲＳフリップフロップ回路の出力として生成・出力してどちらか先に発生した信号の内で先に発生した前記点火装置の点火コイルの通電を停止し点火を発生させる事を特徴とする。   In order to solve the above-described problems, the present invention receives a gasoline injection signal output from the gasoline electronic control unit according to the engine operating state, calculates an injection amount of gasoline alternative fuel based on the gasoline injection signal, and performs ignition. The gasoline alternative fuel electronic control unit that outputs a drive signal to the injector of the apparatus is added to the gasoline injection system that is already installed in the engine, and the gasoline alternative fuel electronic control unit is used for gasoline output from the gasoline electronic control unit. By receiving the ignition signal and adjusting the timing of the ignition timing based on the gasoline ignition signal with the ignition timing correction time obtained by a predetermined method, a gasoline alternative ignition signal adapted to gasoline alternative fuel is generated and output. The ignition control method of an alternative gasoline engine that controls ignition by the ignition coil Thus, the ignition device is of a current interrupting type, and regardless of acceleration / deceleration of the engine speed, an ignition coil energization start signal for gasoline ignition and an energization start signal for alternative fuel are always input. An RS flip-flop that generates and outputs as an output and starts energization of the ignition coil of the ignition device with a signal generated earlier, and receives an ignition coil energization start signal for gasoline ignition and an energization start signal for alternative fuel It is characterized in that energization of the ignition coil of the ignition device, which is generated first in the signal generated and output as the output of the first circuit, is generated first, and ignition is generated.

また、本発明において、回転変動の多い始動時やアイドル回転などの低回転領域では代替燃料の点火制御を停止させガソリン点火制御のみを作動させることを特徴とした請求項１記載の代替燃料エンジンの点火制御方法。前記ガソリン用点火信号からエンジン加減速状態の急激な変化を検知したときに前記点火時期修正時間において前記加減速状態の急激な変化の信号の次に訪れるガソリン用点火時期またはガソリン代替燃料用点火時期のいずれか先行する点火時期のタイミングで前記ガソリン代替燃料用点火信号を生成・出力して点火コイルによる点火を制御することを特徴とする。   The alternative fuel engine according to claim 1, wherein the ignition control of the alternative fuel is stopped and only the gasoline ignition control is operated in a low rotation speed region such as a start-up or idling rotation with a lot of rotational fluctuations. Ignition control method. Gasoline ignition timing or gasoline alternative fuel ignition timing that comes next to the rapid acceleration / deceleration state signal during the ignition timing correction time when a sudden change in engine acceleration / deceleration state is detected from the gasoline ignition signal The ignition signal for gasoline alternative fuel is generated and output at the timing of any preceding ignition timing to control ignition by the ignition coil.

本発明によれば、従来のエンジン運転状態に応じてガソリン用電子制御ユニットが出力するガソリン噴射信号を受信し該ガソリン噴射信号を基にガソリン代替燃料の噴射量を算出して電流遮断式の点火装置におけるインジェクタに駆動信号を出力するガソリン代替燃料用電子制御ユニットをエンジンに既設のガソリン噴射システムに増設するとともに、前記ガソリン代替燃料用電子制御ユニットが、前記ガソリン用電子制御ユニットの出力するガソリン用点火信号を受信し、所定の方法で求めた点火時期修正時間で前記ガソリン用点火信号による点火時期のタイミングを調整することにより、ガソリン代替燃料に適合させたガソリン代替燃料用点火信号を生成・出力して点火コイルによる点火を制御するガソリン代替燃料エンジンの点火制御方法において，エンジンの回転数の変化を見越して、予め回転数が急激に変化しても直後のガソリン点火時期またはガソリン代替燃料点火時期において点火信号が発せられるので遅れることなく回転に合わせて点火することが可能である。   According to the present invention, the current interruption type ignition is performed by receiving the gasoline injection signal output from the gasoline electronic control unit according to the conventional engine operating state, and calculating the injection amount of the gasoline alternative fuel based on the gasoline injection signal. The gasoline alternative fuel electronic control unit that outputs a drive signal to the injector in the system is added to the gasoline injection system already installed in the engine, and the gasoline alternative fuel electronic control unit outputs the gasoline output from the gasoline electronic control unit. By receiving the ignition signal and adjusting the timing of the ignition timing based on the gasoline ignition signal with the ignition timing correction time obtained by a predetermined method, the ignition signal for gasoline alternative fuel adapted to the gasoline alternative fuel is generated and output. Control of gasoline alternative fuel engine that controls ignition by ignition coil According to the law, in anticipation of changes in the engine speed, an ignition signal is issued at the immediately following gasoline ignition timing or gasoline alternative fuel ignition timing even if the engine speed changes abruptly. It is possible.

本発明における実施の形態である燃料噴射システムの配置図。1 is a layout diagram of a fuel injection system according to an embodiment of the present invention. 図１に示した実施の形態についての点火装置を示す回路図。The circuit diagram which shows the ignition device about embodiment shown in FIG. 図１に示した実施の形態についての点火波形処理部における補正のための処理を示す波形図。The wave form diagram which shows the process for the correction | amendment in the ignition waveform process part about embodiment shown in FIG. 図１に示した実施の形態についての噴射信号を選択するための論理回路図。FIG. 2 is a logic circuit diagram for selecting an injection signal for the embodiment shown in FIG. 1. 従来例における燃料噴射システムを示す配置図。The layout which shows the fuel-injection system in a prior art example. ガソリンと代替燃料との間の点火時期の違いによる熱効率の差を説明するためのグラフ。The graph for demonstrating the difference in thermal efficiency by the difference in the ignition timing between gasoline and alternative fuel. 従来例における燃料噴射システムを示す配置図。The layout which shows the fuel-injection system in a prior art example. 従来例におけるガソリン代替燃料用制御ユニットの動作を説明するためのブロック図。The block diagram for demonstrating operation | movement of the control unit for gasoline alternative fuel in a prior art example. 従来例における点火波形処理部におけるδ＜０の場合の処理を示す波形図。The wave form diagram which shows the process in the case of (delta) <0 in the ignition waveform process part in a prior art example. 従来例における点火波形処理部におけるδ＞０の場合の処理を示す波形。The waveform which shows the process in the case of (delta)> 0 in the ignition waveform process part in a prior art example.

以下に、図面を参照しながら本発明における最良の実施の形態を説明する。   The best mode of the present invention will be described below with reference to the drawings.

図１は、本発明のガソリン代替燃料エンジンの点火制御装置を兼ねたガソリン代替燃料噴射制御用の電子制御ユニット３とガソリン代替燃料用のインジェクタ４をエンジン既設のガソリン噴射システムに増設したものであり、ガソリン代替燃料噴射システムを示す配置図である。本発明は、ガソリン用噴射制御装置である電子制御ユニット２とガソリン用インジェクタとを備えたガソリン噴射システムを搭載していた既存のガソリンエンジンを、ガソリン代替燃料エンジンに改造する場合に適用される。   FIG. 1 shows an electronic control unit 3 for gasoline alternative fuel injection control that also serves as an ignition control device for a gasoline alternative fuel engine of the present invention, and an injector 4 for gasoline alternative fuel, which are added to an existing gasoline injection system. FIG. 2 is a layout view showing a gasoline alternative fuel injection system. The present invention is applied when an existing gasoline engine equipped with a gasoline injection system including an electronic control unit 2 that is a gasoline injection control device and a gasoline injector is modified to a gasoline alternative fuel engine.

ガソリン用噴射制御装置としての電子制御ユニット２は、クランク軸回転センサ７、カム軸回転センサ８、吸入空気量センサ９、スロットル開度センサ１０、ノックセンサ１１、エンジン冷却水温度センサ１２により検出したエンジン運転状態を示す各データに基いて算出したガソリン噴射信号を出力し、改造前においてガソリン用インジェクタをこの噴射信号に応じたデューティサイクルで開閉動作させてエンジン要求流量のガソリンを噴射してエンジン１に供給し、且つ、イグナイタ内蔵の点火装置６に最適なタイミングで点火信号を出力するものであって、このこと自体は周知の技術である。   The electronic control unit 2 as an injection control device for gasoline is detected by a crankshaft rotation sensor 7, a camshaft rotation sensor 8, an intake air amount sensor 9, a throttle opening sensor 10, a knock sensor 11, and an engine coolant temperature sensor 12. A gasoline injection signal calculated based on each data indicating the engine operating state is output, and before remodeling, the gasoline injector is opened and closed with a duty cycle corresponding to the injection signal to inject gasoline at the required flow rate of the engine 1. And an ignition signal is output at an optimal timing for the ignition device 6 with a built-in igniter. This is a well-known technique.

特に、前記点火装置６は図２に示したようなイグナイタ内蔵の電流遮断式のものであり、イグニッションコイル６１の一時側にコンタクトポイントと称されるスイッチ６２を介して電流を流し、一次コイルにエネルギーを蓄えて、カムを使ってコンタクトポイントの電流を遮断して一次コイルに蓄えた電気を一気に放出して巻き数の多い二次コイル高電圧を発生させて点火プラグに空気の絶縁を破ってスパークを発生させる従来周知の形式を用いることにより、図２に示した波形の点火電流が得られる。   In particular, the ignition device 6 is of a current interruption type with a built-in igniter as shown in FIG. 2, and a current is passed through a switch 62 called a contact point to the temporary side of the ignition coil 61 to the primary coil. By storing energy, using a cam to cut off the current at the contact point, the electricity stored in the primary coil is released at once, generating a secondary coil high voltage with a large number of turns and breaking the air insulation in the spark plug The ignition current having the waveform shown in FIG. 2 can be obtained by using a well-known method for generating sparks.

そして、改造後において電子制御ユニット２からガソリン噴射信号Ｂを送信する配線を、ガソリン代替燃料用噴射制御装置である電子制御ユニット３の入力ポートＪに接続して受信させ、内部で使用するガソリン代替燃料の特性に対応した補正を行ってインジェクタ駆動信号Ｋを生成・出力し、ガソリン代替燃料用のインジェクタ４を開閉制御するものであり、改造車においても高精度の排気性能を実現できる。   Then, after the remodeling, the wiring for transmitting the gasoline injection signal B from the electronic control unit 2 is connected to the input port J of the electronic control unit 3 which is an injection control device for gasoline alternative fuel so as to be received, and the gasoline replacement used internally. Correction corresponding to the characteristics of the fuel is performed and the injector drive signal K is generated and output, and the injector 4 for gasoline alternative fuel is controlled to open and close, and even in a modified vehicle, highly accurate exhaust performance can be realized.

これに加えて、電子制御ユニット２から出力した点火信号Ａを点火装置６に送信する配線を途中で切断して電子制御ユニット３の入力ポートＵに接続し、且つ、点火コイル装置６には電子制御ユニット３から延出された点火信号Ｒを送信する配線を接続している。   In addition to this, the wiring for transmitting the ignition signal A output from the electronic control unit 2 to the ignition device 6 is cut halfway and connected to the input port U of the electronic control unit 3, and the ignition coil device 6 has an electronic The wiring which transmits the ignition signal R extended from the control unit 3 is connected.

即ち、電子制御ユニット３は、図示しないＣＰＵ，ＲＯＭ，ＲＡＭ，複数の信号入出力部（インターフェース）等を備えたガソリン代替燃料エンジン噴射制御用の電子制御ユニットであるが、そのＲＯＭに以下に述べる本発明の特徴部分となるガソリン代替燃料エンジン用の点火制御プログラムを記憶しており、使用するガソリン代替燃料に適した内容の点火制御方法を実施するガソリン代替燃料エンジン用の点火制御装置を兼ねたものとなっている。   That is, the electronic control unit 3 is an electronic control unit for gasoline alternative fuel engine injection control that includes a CPU, ROM, RAM, a plurality of signal input / output units (interfaces), etc. (not shown). An ignition control program for a gasoline alternative fuel engine, which is a characteristic part of the present invention, is stored, and also serves as an ignition control device for a gasoline alternative fuel engine that implements an ignition control method suitable for the gasoline alternative fuel to be used. It has become a thing.

また、本実施の形態では、電子制御ユニット２とノックセンサ１１とを接続する配線を途中で分岐させて入力ポートＳを介して電子制御ユニット３に接続しノックセンサ信号Ｇを入力しているが、クランク軸回転センサ７、カム軸回転センサ８、吸入空気量センサ９、スロットル開度センサ１０からの配線は接続されておらず、これらの入力ポートを廃している本発明では、点火信号に限ってはエンジンの回転数を検知する必要がない。   In the present embodiment, the wiring connecting the electronic control unit 2 and the knock sensor 11 is branched in the middle and connected to the electronic control unit 3 via the input port S to input the knock sensor signal G. In the present invention in which the wiring from the crankshaft rotation sensor 7, the camshaft rotation sensor 8, the intake air amount sensor 9, and the throttle opening sensor 10 is not connected and these input ports are eliminated, only the ignition signal is used. Therefore, it is not necessary to detect the engine speed.

本実施の形態も、前記図５示した従来例と同様に、図７示すように、ガソリン用の電子制御ユニット２と点火装置６とを接続する配線を切断し、その代わりにガソリン代替燃料用の電子制御ユニット３内部で計算した点火時期および通電角を送信する配線を点火装置６に接続することで、エンジン性能を良好に発揮させるものである。   Similarly to the conventional example shown in FIG. 5, this embodiment also cuts the wiring connecting the gasoline electronic control unit 2 and the ignition device 6 as shown in FIG. By connecting a wiring for transmitting the ignition timing and energization angle calculated inside the electronic control unit 3 to the ignition device 6, the engine performance can be exhibited well.

図３（ａ）は図１に示した実施の形態についての通常の連続したエンジン回転の場合の火波形処理部における補正のための処理を示す波形図であり、例えばガソリン代替燃料用点火信号Ｐ１の１つ前の気筒のガソリン用点火信号Ｎ１のガソリン用点火時期ＧＳ１について各種の補正事項により補正されてガソリン代替燃料用に生成されたガソリン代替燃料用点火ＬＳ１、同じくＧＳ２：ＬＳ２、ＧＳ３：ＬＳ３、・・・と所定の点火時間Ｔ１に応じてｔ１だけガソリン代替燃料用点火信号が送られる。   FIG. 3A is a waveform diagram showing processing for correction in the fire waveform processing section in the case of normal continuous engine rotation for the embodiment shown in FIG. 1, for example, an ignition signal P1 for gasoline alternative fuel Gasoline ignition timing GS1 of the gasoline ignition signal N1 of the previous cylinder is corrected by various correction items and generated for gasoline alternative fuel LS1, GS2: LS2, GS3: LS3 ,... And a gasoline alternative fuel ignition signal is sent for t1 according to a predetermined ignition time T1.

ところで、図３（ａ）のように連続してエンジンを運転している場合には問題ないが、回転が変動した場合には、例えば前記図９や図１０に示したようにガソリン代替燃料用点火信号の位置を前後に調節することにより対処することができるが、回転の変動が極めて大きく、前後に調節する程度では対処できない場合、例えば図３（ｂ）に示したように前記ガソリン代替燃料用点火波形ＬＳ２の後に急な回転数の変動があった場合に次に訪れるガソリン代替燃料用点火波形はＬＳ３であり、エンジン回転に対して次のガソリン代替燃料点火信号の時期が遅れてしまい失火の原因となっている。   By the way, there is no problem when the engine is continuously operated as shown in FIG. 3A, but when the rotation fluctuates, for example, as shown in FIG. 9 and FIG. This can be dealt with by adjusting the position of the ignition signal back and forth, but when the fluctuation in rotation is extremely large and cannot be dealt with by adjusting back and forth, for example, as shown in FIG. The ignition waveform for alternative gasoline fuel that comes next when there is a sudden change in the rotational speed after the ignition waveform LS2 is LS3, and the timing of the next alternative gasoline ignition signal is delayed with respect to the engine rotation. Cause.

そのため、本実施の形態では、このような場合に、エンジン回転数の加減速に拘わらず、常時ガソリン点火用の点火コイル通電開始信号か、代替燃料通電開始信号のどちらか先に発生した信号で点火コイルの通電を開始し、ガソリン又は代替燃料の点火信号の先に発生した信号で点火コイルの通電を停止し点火を発生させることにしている。   Therefore, in this embodiment, in such a case, a signal that is generated first of either the ignition coil energization start signal for gasoline ignition or the alternative fuel energization start signal is always used regardless of the acceleration / deceleration of the engine speed. Energization of the ignition coil is started, and energization of the ignition coil is stopped by a signal generated before the ignition signal of gasoline or alternative fuel to generate ignition.

図４はその際の前記ガソリン代替燃料用の電子制御ユニット３内部での演算を示す論理回路であり、ガソリン燃料用における点火開始時の点火信号（Ｓｅｔ信号１）とガソリン代替燃料用における点火開始時の点火信号（Ｓｅｔ信号２）の早いほうを選択する論理回路と、ガソリン燃料用における点火停止時の点火信号（Ｒｓｅｔ信号１）とガソリン代替燃料用における点火停止時の点火信号（Ｒｓｅｔ信号２）の早いほうを選択する論理回路とＲＳフリップフロップ論の回路により選択して点火を制御している。   FIG. 4 is a logic circuit showing the calculation in the electronic control unit 3 for gasoline alternative fuel at that time, and an ignition signal (Set signal 1) at the start of ignition for gasoline fuel and ignition start for gasoline alternative fuel. Logic circuit for selecting the earlier ignition signal (Set signal 2) at the time of ignition, an ignition signal (Rset signal 1) at the time of ignition stop for gasoline fuel, and an ignition signal (Rset signal 2) at the time of ignition stop for gasoline alternative fuel ) Is controlled by a logic circuit that selects the earlier one) and an RS flip-flop circuit to control ignition.

尚、回転変動の多い始動時やアイドル回転などの低回転領域では代替燃料の点火制御を停止させガソリン点火制御のみを作動させることにより逆に低回転域での確実な点火を確保することもできる。   It is also possible to ensure reliable ignition in the low rotation range by stopping the ignition control of the alternative fuel and operating only the gasoline ignition control in the low rotation range such as at start-up or idling rotation with a lot of rotational fluctuations. .

１ エンジン、２，３ 電子制御ユニット、４ インジェクタ、６ 点火装置、７ クランク軸回転センサ、８ カム軸回転センサ、９ 吸入空気量センサ、１０ スロットル開度センサ、１１ ノックセンサ、１２ エンジン冷却水温度センサ、３０ マイコン、３１ 電気的負荷装置   1 Engine, 2, 3 Electronic control unit, 4 Injector, 6 Ignition device, 7 Crankshaft rotation sensor, 8 Camshaft rotation sensor, 9 Intake air amount sensor, 10 Throttle opening sensor, 11 Knock sensor, 12 Engine coolant temperature Sensor, 30 microcomputer, 31 Electrical load device

Claims (2)

エンジン運転状態に応じてガソリン用電子制御ユニットが出力するガソリン噴射信号を受信し該ガソリン噴射信号を基にガソリン代替燃料の噴射量を算出して点火装置のインジェクタに駆動信号を出力するガソリン代替燃料用電子制御ユニットをエンジンに既設のガソリン噴射システムに増設するとともに、前記ガソリン代替燃料用電子制御ユニットが、前記ガソリン用電子制御ユニットの出力するガソリン用点火信号を受信し、所定の方法で求めた点火時期修正時間で前記ガソリン用点火信号による点火時期のタイミングを調整することにより、ガソリン代替燃料に適合させたガソリン代替用点火信号を生成・出力して点火コイルによる点火を制御するガソリン代替燃料エンジンの点火制御方法において、
前記点火装置が電流遮断式であって、エンジン回転数の加減速に拘わらず、常時ガソリン点火用の点火コイル通電開始信号と、代替燃料の通電開始信号が入力されるＲＳフリップフロップ回路の出力として生成・出力してどちらか先に発生した信号で前記点火装置の点火コイルの通電を開始し、ガソリン点火用の点火コイル通電開始信号と、代替燃料の通電開始信号が入力されるＲＳフリップフロップ回路の出力として生成・出力してどちらか先に発生した信号の内で先に発生した前記点火装置の点火コイルの通電を停止し点火を発生させる事を特徴とした代替燃料エンジンの点火制御方法。 Gasoline alternative fuel that receives a gasoline injection signal output from the gasoline electronic control unit according to the engine operating state, calculates an injection amount of the gasoline alternative fuel based on the gasoline injection signal, and outputs a drive signal to the injector of the ignition device The electronic control unit for gasoline is added to the gasoline injection system already installed in the engine, and the electronic control unit for gasoline alternative fuel receives the ignition signal for gasoline output from the electronic control unit for gasoline and is obtained by a predetermined method. A gasoline alternative fuel engine that controls ignition by an ignition coil by generating and outputting a gasoline alternative ignition signal adapted to gasoline alternative fuel by adjusting the timing of the ignition timing by the gasoline ignition signal with the ignition timing correction time In the ignition control method,
As the output of the RS flip-flop circuit to which the ignition coil energization start signal for gasoline ignition and the energization start signal of alternative fuel are always input regardless of the acceleration / deceleration of the engine speed, the ignition device is a current interruption type An RS flip-flop circuit that starts energization of the ignition coil of the ignition device with a signal generated and output first, and receives an ignition coil energization start signal for gasoline ignition and an energization start signal for alternative fuel An ignition control method for an alternative fuel engine, characterized in that the ignition coil of the ignition device that is generated earlier is generated and output as an output of the ignition device to stop energization to generate ignition. 回転変動の多い始動時やアイドル回転などの低回転領域では代替燃料の点火制御を停止させガソリン点火制御のみを作動させることを特徴とした請求項１記載の代替燃料エンジンの点火制御方法。   2. The ignition control method for an alternative fuel engine according to claim 1, wherein the ignition control of the alternative fuel is stopped and only the gasoline ignition control is operated in a low engine speed range such as start-up with a lot of rotation fluctuations or idle rotation.
JP2012162130A 2012-07-20 2012-07-20 Ignition control method for alternative fuel engine Expired - Fee Related JP6154998B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012162130A JP6154998B2 (en) 2012-07-20 2012-07-20 Ignition control method for alternative fuel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012162130A JP6154998B2 (en) 2012-07-20 2012-07-20 Ignition control method for alternative fuel engine

Publications (2)

Publication Number Publication Date
JP2014020334A true JP2014020334A (en) 2014-02-03
JP6154998B2 JP6154998B2 (en) 2017-06-28

Family

ID=50195512

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2012162130A Expired - Fee Related JP6154998B2 (en) 2012-07-20 2012-07-20 Ignition control method for alternative fuel engine

Country Status (1)

Country Link
JP (1) JP6154998B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109322751A (en) * 2018-10-09 2019-02-12 广西玉柴机器股份有限公司 The gas engine of adaptive methane concentration variation starts control method
CN114017235A (en) * 2021-09-30 2022-02-08 北京合升众成科技有限公司 Gas ignition method for ignition coil of oil-gas dual-purpose fuel vehicle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5584863A (en) * 1978-12-19 1980-06-26 Mitsubishi Electric Corp Magnetic sparking system
JPH06137247A (en) * 1992-10-27 1994-05-17 Sanshin Ind Co Ltd Engine stop control device
US20040139944A1 (en) * 2003-01-06 2004-07-22 Hitachi, Ltd. Method and device for controlling fuel injection in the bi-fuel internal combustion engine
JP2004324516A (en) * 2003-04-24 2004-11-18 Kokusan Denki Co Ltd Ignition device for internal combustion engine
JP2007332814A (en) * 2006-06-13 2007-12-27 Nikki Co Ltd Method and device for ignition control of gasoline alternate fuel engine
JP2008014258A (en) * 2006-07-07 2008-01-24 Nikki Co Ltd Method and device for controlling ignition in gasoline alternate fuel engine
JP2011099412A (en) * 2009-11-09 2011-05-19 Fujitsu Ten Ltd Engine control system and electronic control device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5584863A (en) * 1978-12-19 1980-06-26 Mitsubishi Electric Corp Magnetic sparking system
JPH06137247A (en) * 1992-10-27 1994-05-17 Sanshin Ind Co Ltd Engine stop control device
US20040139944A1 (en) * 2003-01-06 2004-07-22 Hitachi, Ltd. Method and device for controlling fuel injection in the bi-fuel internal combustion engine
JP2004324516A (en) * 2003-04-24 2004-11-18 Kokusan Denki Co Ltd Ignition device for internal combustion engine
JP2007332814A (en) * 2006-06-13 2007-12-27 Nikki Co Ltd Method and device for ignition control of gasoline alternate fuel engine
JP2008014258A (en) * 2006-07-07 2008-01-24 Nikki Co Ltd Method and device for controlling ignition in gasoline alternate fuel engine
JP2011099412A (en) * 2009-11-09 2011-05-19 Fujitsu Ten Ltd Engine control system and electronic control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109322751A (en) * 2018-10-09 2019-02-12 广西玉柴机器股份有限公司 The gas engine of adaptive methane concentration variation starts control method
CN114017235A (en) * 2021-09-30 2022-02-08 北京合升众成科技有限公司 Gas ignition method for ignition coil of oil-gas dual-purpose fuel vehicle

Also Published As

Publication number Publication date
JP6154998B2 (en) 2017-06-28

Similar Documents

Publication Publication Date Title
US9528490B2 (en) Method and system for pre-ignition control
JP6476295B2 (en) Engine control device
EP2957753B1 (en) Fuel control device for gas engine
JP2004245173A (en) Knocking index value calculation device
JP2007332814A (en) Method and device for ignition control of gasoline alternate fuel engine
JP2014062468A (en) Control device for variable valve timing mechanism
US20170226951A1 (en) Control device for internal combustion engine
JP2008014258A (en) Method and device for controlling ignition in gasoline alternate fuel engine
US9145796B2 (en) Control unit for variable valve timing mechanism and control method for variable valve timing mechanism
MX2014011269A (en) Control device of internal combustion engine with supercharger.
US9995231B2 (en) Apparatus and method for controlling cold starting of diesel engine vehicle
JP6154998B2 (en) Ignition control method for alternative fuel engine
US20130247850A1 (en) Control unit for variable valve timing mechanism and control method for variable valve timing mechanism
JP5956213B2 (en) Ignition control method for alternative fuel engine
JP6489730B2 (en) Ignition control method for gasoline alternative fuel engine
JP2019190379A (en) Internal combustion engine and hybrid vehicle comprising the same
JP2007247606A (en) Control device for internal combustion engine
JP6489729B2 (en) Ignition control method for gasoline alternative fuel engine
JP6424603B2 (en) Engine preignition detection device
JP6454538B2 (en) Internal combustion engine control device
JP6077371B2 (en) Control device for internal combustion engine
JP4803117B2 (en) Start control device for internal combustion engine
JP2008075496A (en) Stop control device for engine
JP6454539B2 (en) Internal combustion engine control device
JP2004245172A (en) Ignition timing control device for engine

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20150717

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20160425

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20160427

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20160622

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20160915

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20161107

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20170111

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20170411

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20170411

A911 Transfer to examiner for re-examination before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20170420

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20170516

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20170605

R150 Certificate of patent or registration of utility model

Ref document number: 6154998

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees