JP3286371B2 - Fuel injection control device for internal combustion engine - Google Patents
Fuel injection control device for internal combustion engineInfo
- Publication number
- JP3286371B2 JP3286371B2 JP02523793A JP2523793A JP3286371B2 JP 3286371 B2 JP3286371 B2 JP 3286371B2 JP 02523793 A JP02523793 A JP 02523793A JP 2523793 A JP2523793 A JP 2523793A JP 3286371 B2 JP3286371 B2 JP 3286371B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel supply
- supply pressure
- current
- fuel injection
- valve
- 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.)
- Expired - Fee Related
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、作動コイルへの励磁電
流供給に応じて弁体が開弁方向に吸引作動せしめられる
燃料噴射用電磁弁が、燃料供給圧を可変とした燃料供給
圧変更手段を介して燃料供給源に接続され、弁体をその
閉弁状態から開弁方向に作動せしめる吸引初期時には高
目標電流で前記作動コイルの励磁電流が制御され、弁体
を開弁状態に保持する吸引保持時には低目標電流で前記
作動コイルの励磁電流が制御される内燃機関の燃料噴射
制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection solenoid valve in which a valve element is operated in a valve-opening direction in response to an excitation current supplied to an operating coil. Connected to the fuel supply source through the means, and the valve body is operated in the valve opening direction from the closed state.At the initial stage of suction, the exciting current of the operating coil is controlled with a high target current, and the valve body is maintained in the valve open state. The present invention relates to a fuel injection control device for an internal combustion engine in which the exciting current of the working coil is controlled by a low target current during suction holding.
【０００２】[0002]
【従来の技術】従来、吸引初期時には高目標電流で作動
コイルの励磁電流を制御して燃料噴射用電磁弁の開弁応
答性を高め、開弁後の吸引保持時には低目標電流で前記
作動コイルの励磁電流を制御して、作動コイルの発熱を
抑えるとともに電力の浪費を回避するようにしたもの
が、たとえば特公昭４９−４５２４８号公報および特公
昭５０−７２１１号公報等により知られている。2. Description of the Related Art Conventionally, at the initial stage of suction, the excitation current of the working coil is controlled with a high target current to enhance the valve opening response of the solenoid valve for fuel injection. Are known, for example, Japanese Patent Publication No. 49-45248 and Japanese Patent Publication No. 50-7211, in which the exciting current is controlled to suppress the heat generation of the working coil and to avoid wasting power.
【０００３】[0003]
【発明が解決しようとする課題】ところで、燃料噴射量
制御を広範囲かつ微妙に行なうこと、ならびにダイナミ
ックレンジを広げる等の目的から、燃料噴射用電磁弁へ
の燃料供給圧を機関の運転状態に応じて可変制御するこ
とが検討されている。In order to control the fuel injection amount in a wide range and delicately, and to widen the dynamic range, the fuel supply pressure to the solenoid valve for fuel injection is changed according to the operating state of the engine. It is being considered to perform variable control.
【０００４】しかるに上記従来のものでは、吸引初期時
の高目標電流ならびに吸引保持時の低目標電流はそれぞ
れ一定に設定されるものであり、燃料供給圧の可変制御
を行なう場合には、燃料圧が最も高い状態での弁体の吸
引および保持を可能として上記高目標電流および低目標
電流を設定する必要があり、そうすると燃料圧が低く変
化したときには高い燃料圧に対応した励磁電流が作動コ
イルに供給されることになる。したがって弁体が必要以
上に大きな力で作動することによる衝突により燃料噴射
用電磁弁の作動劣化を早めて耐久信頼性の低下を招くだ
けでなく、必要以上の励磁電流を供給することになって
効率が低下する。However, in the above conventional apparatus, the high target current at the beginning of suction and the low target current at the time of suction holding are respectively set to be constant. It is necessary to set the high target current and the low target current so that the valve element can be sucked and held in the highest state, and when the fuel pressure changes low, an exciting current corresponding to the high fuel pressure is applied to the working coil. Will be supplied. Therefore, a collision caused by the valve element operating with an unnecessarily large force not only accelerates the deterioration of the operation of the fuel injection solenoid valve, lowers the durability reliability, but also supplies an unnecessary excitation current. Efficiency decreases.
【０００５】本発明は、かかる事情に鑑みてなされたも
のであり、燃料供給圧の変化に応じた励磁電流制御によ
り燃料噴射用電磁弁の耐久信頼性および効率の向上を図
った内燃機関の燃料噴射制御装置を提供することを目的
とする。The present invention has been made in view of the above circumstances, and has been developed in order to improve the durability reliability and efficiency of a fuel injection solenoid valve by controlling an excitation current in accordance with a change in fuel supply pressure. It is an object to provide an injection control device.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、請求項１記載の発明に従う装置は、燃料供給圧変更
手段から燃料噴射用電磁弁への燃料供給圧を検出する燃
料供給圧検出器と、該燃料供給圧に基づいて吸引初期時
の高目標電流を定める吸引初期用目標値設定手段と、前
記燃料供給圧に基づいて吸引保持時の低目標電流を定め
る吸引保持用目標値設定手段とを備える。According to a first aspect of the present invention, there is provided a fuel supply pressure detecting device for detecting a fuel supply pressure from a fuel supply pressure changing means to a fuel injection solenoid valve. Device, a suction initial target value setting means for determining a high target current at the beginning of suction based on the fuel supply pressure, and a suction holding target value setting for determining a low target current during suction holding based on the fuel supply pressure. Means.
【０００７】また請求項２記載の発明に従う装置は、上
記請求項１記載の発明の構成に加えて、内燃機関の吸気
負圧を検出する吸気負圧検出器と、該吸気負圧および燃
料供給圧の相対値を演算する相対値演算手段とを備え、
両目標値設定手段は、前記相対値に応じて高および低目
標電流を設定すべく構成される。According to a second aspect of the present invention, in addition to the configuration of the first aspect, an intake negative pressure detector for detecting an intake negative pressure of an internal combustion engine, and the intake negative pressure and fuel supply are provided. Relative value calculating means for calculating a relative value of the pressure,
Both target value setting means are configured to set the high and low target currents according to the relative value.
【０００８】さらに請求項３記載の発明に従う装置は、
燃料供給圧変更手段から燃料噴射用電磁弁への燃料供給
圧を検出する燃料供給圧検出器と、吸引初期時の高目標
電流による励磁電流制御時間を前記燃料供給圧に基づい
て定める時間設定手段と、前記燃料供給圧に基づいて吸
引保持時の低目標電流を定める目標値設定手段とを備え
る。[0008] The device according to the third aspect of the present invention further comprises:
A fuel supply pressure detector for detecting a fuel supply pressure from the fuel supply pressure changing means to the fuel injection solenoid valve; and a time setting means for determining an exciting current control time based on the high target current at the beginning of suction based on the fuel supply pressure. And target value setting means for determining a low target current during suction holding based on the fuel supply pressure.
【０００９】[0009]
【実施例】以下、図面により本発明の実施例について説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１ないし図６は本発明の第１実施例を示
すものであり、図１は燃料噴射制御装置の構成を示す
図、図２は燃料噴射用電磁弁の縦断面図、図３は駆動ユ
ニットの回路構成図、図４はタイミングチャート、図５
は吸気負圧および燃料供給圧の相対値に応じた高目標電
流を示す図、図６は吸気負圧および燃料供給圧の相対値
に応じた低目標電流を示す図である。FIGS. 1 to 6 show a first embodiment of the present invention. FIG. 1 is a view showing the structure of a fuel injection control device, FIG. 2 is a longitudinal sectional view of a fuel injection solenoid valve, and FIG. Is a circuit configuration diagram of the drive unit, FIG. 4 is a timing chart, and FIG.
FIG. 6 shows a high target current according to the relative values of the intake negative pressure and the fuel supply pressure, and FIG. 6 shows a low target current according to the relative values of the intake negative pressure and the fuel supply pressure.
【００１１】先ず図１において、たとえば４気筒内燃機
関の機関本体Ｅには、各気筒１…に摺動自在に嵌合され
ているピストン２…の上面を臨ませる燃焼室３…が形成
されるとともに、開閉自在の吸気弁４…を介して各燃焼
室３…に接続される吸気ポート５…が設けられており、
各吸気ポート５…には吸気マニホールド６が連結され
る。而して吸気マニホールド６の機関本体Ｅ寄りの部分
には、各吸気ポート５…に向けてガス燃料を噴射するた
めの燃料噴射用電磁弁７…が取付けられる。In FIG. 1, for example, a combustion chamber 3 is formed in an engine body E of a four-cylinder internal combustion engine so as to face an upper surface of a piston 2 slidably fitted to each cylinder 1. At the same time, there are provided intake ports 5 connected to the respective combustion chambers 3 via openable and closable intake valves 4.
An intake manifold 6 is connected to each of the intake ports 5. A fuel injection solenoid valve 7 for injecting gas fuel toward each intake port 5 is attached to a portion of the intake manifold 6 near the engine body E.
【００１２】燃料噴射用電磁弁７…には燃料供給圧変更
手段としての電磁制御弁８を介して燃料供給源９が接続
されており、電磁制御弁８の作動は燃料供給圧制御ユニ
ットＵP で制御される。また各燃料噴射用電磁弁７…は
駆動ユニットＵD1で駆動されるものであり、駆動ユニッ
トＵD1からは各燃料噴射用電磁弁７…に対応して＃１〜
＃４の駆動信号が出力され、該駆動ユニットＵD1には機
関作動制御ユニットＵ F から各燃料噴射用電磁弁７…に
それぞれ対応した４つの指令信号が入力される。The fuel supply pressure is changed for the fuel injection solenoid valves 7.
A fuel supply source 9 is connected via an electromagnetic control valve 8 as a means.
The operation of the electromagnetic control valve 8 is controlled by the fuel supply pressure control unit.
UPIs controlled by Each fuel injection solenoid valve 7 ...
Drive unit UD1Drive unit.
UD1From # 1 to # 1 corresponding to each fuel injection solenoid valve 7.
The drive signal of # 4 is output and the drive unit UD1The machine
Seki operation control unit U FFrom each fuel injection solenoid valve 7 ...
Four corresponding command signals are input.
【００１３】電磁制御弁８および各燃料噴射用電磁弁７
…間の燃料供給系にはチャンバ１０が介設されており、
該チャンバ１０には、燃料温度ＴF を検出する温度検出
器１１、燃料供給圧ＰF を検出する燃料供給圧検出器１
２、ならびに燃料成分ＩF を検出する成分検出器１３が
付設される。また吸気マニホールド６には吸気負圧Ｐ B
を検出する吸気負圧検出器１４が付設される。而して温
度検出器１１、燃料供給圧検出器１２、成分検出器１３
および吸気負圧検出器１４は燃料供給圧制御ユニットＵ
P に接続されており、燃料供給圧制御ユニットＵP は、
燃料温度ＴF 、燃料供給圧ＰF および燃料成分ＩF で代
表される燃料状態情報、ならびに吸気負圧ＰB および機
関回転数等の機関運転状態情報に基づいて、燃料供給圧
ＰF を変更すべく電磁制御弁８の作動を制御する。Electromagnetic control valve 8 and each fuel injection electromagnetic valve 7
The chamber 10 is interposed in the fuel supply system between
The chamber 10 has a fuel temperature TFDetecting the temperature detection
Unit 11, fuel supply pressure PFSupply pressure detector 1 for detecting pressure
2, and fuel component IFIs detected by the component detector 13
It is attached. The intake manifold 6 has an intake negative pressure P B
Is provided. So warm
Degree detector 11, fuel supply pressure detector 12, component detector 13
And the intake negative pressure detector 14 are connected to the fuel supply pressure control unit U.
PAnd the fuel supply pressure control unit UPIs
Fuel temperature TF, Fuel supply pressure PFAnd fuel component IFWith
Fuel condition information to be represented, and intake negative pressure PBAnd machine
Fuel supply pressure based on engine operating state information such as engine speed
PFThe operation of the electromagnetic control valve 8 is controlled in order to change.
【００１４】機関作動制御ユニットＵF は、吸気負圧Ｐ
B および機関回転数等の機関運転状態情報に基づいて燃
料噴射および点火時期等の制御を行なうものであり、駆
動ユニットＵD1は、機関作動制御ユニットＵF から入力
される燃料噴射指令信号と、燃料供給圧検出器１２から
入力される燃料供給圧ＰF と、吸気負圧検出器１４から
入力される吸気負圧ＰB とに基づいて、各燃料噴射用電
磁弁７…を駆動する。The engine operation control unit U F has an intake negative pressure P
Based on the engine operating state information of B and the engine speed or the like and performs the fuel injection and ignition timing control of such drive unit U D1 includes a fuel injection command signal inputted from the engine operation control unit U F, a fuel supply pressure P F is inputted from the fuel supply pressure detector 12, based on the intake negative pressure P B supplied from the intake negative pressure detector 14, and drives the solenoid valve 7 ... for each fuel injector.
【００１５】図２において、燃料噴射用電磁弁７のハウ
ジング１５は、大径円筒部１５ａと、小径円筒部１５ｂ
とが段部１５ｃを介して同軸に連設されて磁性金属によ
り形成されるものであり、小径円筒部１５ｂの先端部に
は弁座部材１６が嵌合、固着され、該弁座部材１６の後
端には、弁孔１７を中央部に開口させる弁座１８が設け
られる。また大径円筒部１５ａ内には、小径円筒部１５
ｂにその内面を連ならせて一端部が連設される非磁性材
料製の案内筒１９が同軸に配置されており、磁性金属に
より円筒状に形成される固定コア２０の一端部が案内筒
１９の他端部に同軸に嵌合され、半径方向外方に張り出
して固定コア２０に一体に設けられるフランジ２１が、
前記大径円筒部１５ａの開口端にかしめ結合される。In FIG. 2, a housing 15 of the fuel injection solenoid valve 7 has a large-diameter cylindrical portion 15a and a small-diameter cylindrical portion 15b.
Are formed coaxially and continuously through a step portion 15c, and are formed of magnetic metal. A valve seat member 16 is fitted and fixed to the distal end of the small-diameter cylindrical portion 15b. At the rear end, a valve seat 18 that opens the valve hole 17 to the center is provided. In the large-diameter cylindrical portion 15a, a small-diameter cylindrical portion 15 is provided.
A guide tube 19 made of a non-magnetic material, one end of which is connected to the inner surface thereof, is coaxially arranged, and one end of a fixed core 20 formed of a magnetic metal in a cylindrical shape is connected to the guide tube. A flange 21 fitted coaxially with the other end of the fixed core 19 and extending outward in the radial direction and provided integrally with the fixed core 20 is provided.
It is caulked to the open end of the large-diameter cylindrical portion 15a.
【００１６】ハウジング１５の大径円筒部１５ａ内に
は、段部１５ｃおよびフランジ２１間で挟持されるよう
にして案内筒１９を同軸に囲繞するボビン２２が収納さ
れており、該ボビン２２には作動コイル２３が巻装され
る。In the large-diameter cylindrical portion 15a of the housing 15, a bobbin 22 that coaxially surrounds the guide tube 19 so as to be sandwiched between the step portion 15c and the flange 21 is accommodated. The working coil 23 is wound.
【００１７】固定コア２０および弁座部材１６間には、
小径円筒部１５ｂおよび案内筒１９で軸方向移動を案内
される可動コア２４が収容されており、該可動コア２４
および弁座部材１６間には弁室２６が形成される。この
可動コア２４には、弁座１８に着座可能な弁体２５が一
体に設けられるとともに、弁室２６に通じる連通路２７
が後端を固定コア２０側に開口させて穿設される。Between the fixed core 20 and the valve seat member 16,
A movable core 24 guided in the axial direction by the small-diameter cylindrical portion 15b and the guide cylinder 19 is accommodated therein.
A valve chamber 26 is formed between the valve seat 16 and the valve seat member 16. The movable core 24 is integrally provided with a valve body 25 that can be seated on the valve seat 18, and a communication passage 27 communicating with a valve chamber 26.
Is drilled with its rear end opened toward the fixed core 20.
【００１８】固定コア２０には、フランジ２１よりも後
方側（図２の右側）に延びる延長筒２８が一体にかつ同
軸に設けられており、固定コア２０および延長筒２８に
はスリーブ２９が圧入される。また可動コア２４と前記
スリーブ２９との間には戻しばね３０が縮設される。し
たがって可動コア２４すなわち弁体２５は戻しばね３０
のばね力により前方すなわち弁体２５が弁座１８に着座
する方向に付勢される。さらに可動コア２４の後端部に
は、可動コア２４の固定コア２０側への吸引作動時に固
定コア２０に接触して可動コア２４の固定コア２０側へ
の移動限を規制するストッパ３１が装着される。The fixed core 20 is provided integrally and coaxially with an extension tube 28 extending rearward (to the right in FIG. 2) from the flange 21. A sleeve 29 is press-fitted into the fixed core 20 and the extension tube 28. Is done. A return spring 30 is contracted between the movable core 24 and the sleeve 29. Therefore, the movable core 24, that is, the valve body 25 is
, The valve body 25 is urged in the direction in which the valve body 25 is seated on the valve seat 18. Further, a stopper 31 is attached to the rear end of the movable core 24 so as to come into contact with the fixed core 20 during the suction operation of the movable core 24 toward the fixed core 20 and to limit the movement limit of the movable core 24 toward the fixed core 20. Is done.
【００１９】延長筒２８の後部にはフィルタ３２が装着
されており、図１で示した電磁制御弁８からの燃料は、
フィルタ３２からスリーブ２９および固定コア２０内を
経て、連通路２７から弁室２６に供給されることにな
る。A filter 32 is mounted at the rear of the extension cylinder 28, and the fuel from the electromagnetic control valve 8 shown in FIG.
The fluid is supplied from the filter 32 to the valve chamber 26 through the communication passage 27 through the sleeve 29 and the fixed core 20.
【００２０】このような燃料噴射用電磁弁７において
は、作動コイル２３の励磁に応じて可動コア２４が戻し
ばね３０のばね力に抗して固定コア２０側に吸引され、
弁体２５が弁座１８から離反して弁室２６が弁孔１７に
連通され、作動コイル２３を消磁すると、可動コア２４
が戻しばね３０のばね力により固定コア２０から離反す
る方向に移動して弁体２５が弁座１８に着座し、弁室２
６および弁孔１７間が遮断されることになる。In the fuel injection solenoid valve 7, the movable core 24 is attracted to the fixed core 20 against the spring force of the return spring 30 in response to the excitation of the operating coil 23.
When the valve body 25 is separated from the valve seat 18 and the valve chamber 26 is communicated with the valve hole 17 and the operating coil 23 is demagnetized, the movable core 24
Is moved in a direction away from the fixed core 20 by the spring force of the return spring 30, and the valve body 25 is seated on the valve seat 18 so that the valve chamber 2
6 and the valve hole 17 are shut off.
【００２１】図３において、燃料噴射用電磁弁７を駆動
するための駆動ユニットＵD1は、たとえば１２Ｖの外部
電源３５に接続される電源端子３６と、機関作動制御ユ
ニットＵF からの指令信号が入力される入力端子３７
と、燃料供給圧検出器１２からの燃料供給圧ＰF に応じ
た信号を受ける入力端子３８と、吸気負圧検出器１４か
らの吸気負圧ＰB に応じた信号を受ける入力端子３９
と、作動コイル２３の一端に接続される出力端子４０
と、作動コイル２３の他端に接続される出力端子４１
と、接地される接地端子４２とを備える。[0021] In FIG. 3, the drive unit U D1 for driving the solenoid valve 7 for the fuel injection, for example, a power supply terminal 36 connected to an external power supply 35 of 12V, the command signal from the engine operation control unit U F Input terminal 37 to be input
When an input terminal 38 for receiving a signal corresponding to the fuel supply pressure P F from the fuel supply pressure detector 12, an input terminal receiving a signal corresponding to the intake negative pressure P B from the intake negative pressure detector 14 39
And an output terminal 40 connected to one end of the operating coil 23
And an output terminal 41 connected to the other end of the operating coil 23
And a ground terminal 42 to be grounded.
【００２２】外部電源３５に接続される電源端子３６
と、作動コイル２３の一端に接続される出力端子４０と
の間には、ダイオード４３と、スイッチ回路４５の構成
要素たるトランジスタ４４とが直列に接続され、作動コ
イル２３の他端に接続される出力端子４１は電流検出用
抵抗４６を介して接地端子４２に接続される。また外部
電源３５からの電圧をたとえば１２Ｖから７０Ｖに昇圧
する昇圧回路４７とスイッチング素子としての電界効果
トランジスタ４８とから成る直列回路がダイオード４３
に並列に接続されており、昇圧回路４７および電界効果
トランジスタ４８間にはコンデンサ４９が接続される。
さらに駆動ユニットＵD1内の基準電源としてたとえば５
Ｖの一定電圧を得るための定電圧回路５１が電源端子３
６に接続される。Power supply terminal 36 connected to external power supply 35
A diode 43 and a transistor 44 which is a component of a switch circuit 45 are connected in series between the output coil 40 and an output terminal 40 connected to one end of the operation coil 23, and are connected to the other end of the operation coil 23. The output terminal 41 is connected to the ground terminal 42 via the current detection resistor 46. A diode 43 is connected in series with a booster circuit 47 for boosting the voltage from the external power supply 35 from, for example, 12 V to 70 V, and a field effect transistor 48 as a switching element.
, And a capacitor 49 is connected between the booster circuit 47 and the field-effect transistor 48.
Further, as a reference power supply in the drive unit U D1 , for example, 5
A constant voltage circuit 51 for obtaining a constant voltage of V
6 is connected.
【００２３】作動コイル２３の両端に接続される出力端
子４０，４１間には、逆起電力吸収回路５２の構成要素
たる電界効果トランジスタ５３が接続されており、逆起
電力吸収回路５２には、機関作動制御ユニットＵF から
入力端子３７に入力された指令信号が増幅器５４で増幅
されて与えられる。而して機関作動制御ユニットＵFか
ら入力端子３７には、燃料噴射用電磁弁７を開弁せしめ
るときにローレベルとなる指令信号が入力されるもので
あり、逆起電力吸収回路５２は、機関作動制御ユニット
ＵF からの指令信号の立ち上がり、すなわち作動コイル
２３への励磁電流供給停止に応じて電界効果トランジス
タ５３をオンさせて、作動コイル２３の逆起電力を吸収
する働きをする。A field effect transistor 53, which is a component of the back electromotive force absorbing circuit 52, is connected between the output terminals 40, 41 connected to both ends of the working coil 23. engine operation control unit command signals input from the U F to the input terminal 37 is supplied is amplified by an amplifier 54. Thus the type terminals 37 from the engine operation control unit U F and is for command signal which becomes low when allowed to open the fuel injection solenoid valve 7 is input, the counter electromotive force absorbing circuit 52, the rise of the command signal from the engine operation control unit U F, i.e. by turning on the field effect transistor 53 in response to the exciting current supply is stopped to the working coil 23, serves to absorb the counter electromotive force of the exciting coil 23.
【００２４】燃料供給圧検出器１２が接続される入力端
子３８と、吸気負圧検出器１４が接続される入力端子３
９とは、吸気負圧ＰB および燃料供給圧ＰF の相対値を
演算する相対値演算手段としての差動増幅器５７に接続
されており、燃料供給圧ＰFおよび吸気負圧ＰB 間の差
圧（ＰF −ＰB ）が差動増幅器５７で演算されることに
なる。この差動増幅器５７の出力は、吸引初期用目標値
設定手段としての差動増幅器５８の非反転入力端子なら
びに吸引保持用目標値設定手段としての差動増幅器５９
の非反転入力端子にそれぞれ入力される。一方、差動増
幅器５８，５９の反転入力端子には一定の基準値がそれ
ぞれ入力されている。これにより差動増幅器５８から
は、差圧（ＰF −ＰB ）が大きくなるのに応じて大とな
るハイレベルの電圧信号が出力され、また差動増幅器５
９からは、差圧（ＰF −ＰB ）が大きくなるのに応じて
大となるハイレベルの電圧信号が出力されることにな
る。An input terminal 38 to which the fuel supply pressure detector 12 is connected, and an input terminal 3 to which the intake negative pressure detector 14 is connected
9 and the intake negative pressure P is connected to the differential amplifier 57 of the B and the relative value of the fuel supply pressure P F as a relative value calculating means for calculating a fuel supply pressure P F and the intake negative transmembrane pressure P B of The differential pressure (P F -P B ) is calculated by the differential amplifier 57. The output of the differential amplifier 57 is supplied to a non-inverting input terminal of a differential amplifier 58 as a suction initial target value setting means and a differential amplifier 59 as a suction holding target value setting means.
, Respectively. On the other hand, fixed reference values are input to the inverting input terminals of the differential amplifiers 58 and 59, respectively. As a result, the differential amplifier 58 outputs a high-level voltage signal which increases as the differential pressure (P F -P B ) increases.
From 9, a high-level voltage signal that increases as the differential pressure (P F −P B ) increases is output.
【００２５】スイッチ回路４５におけるトランジスタ４
４は、低電流制御回路６０からハイレベルの信号が入力
されるのに応じて導通するものであり、該低電流制御回
路６０は、スイッチ回路４５におけるトランジスタ４４
を導通させる際にハイレベルの信号を出力する比較器６
１と、分圧抵抗６２とを備える。比較器６１の非反転入
力端子には、差動増幅器５９がダイオード６３を介して
接続されるとともに分圧抵抗６２の中間部が接続され、
比較器６１の反転入力端子には、出力端子４１および電
流検出用抵抗４６間が抵抗７２を介して接続され、定電
圧回路５１に連なる基準電源ライン７３が抵抗７４を介
して比較器６１の反転入力端子および抵抗７２間に接続
される。また前記分圧抵抗６２の一端にはインバータ５
５を介して増幅器５４が接続され、分圧抵抗６２の他端
には高電流制御回路６４1 が接続される。Transistor 4 in switch circuit 45
4 conducts in response to the input of a high level signal from the low current control circuit 60. The low current control circuit 60
6 that outputs a high-level signal when conducting
1 and a voltage dividing resistor 62. A differential amplifier 59 is connected to a non-inverting input terminal of the comparator 61 via a diode 63, and an intermediate portion of a voltage dividing resistor 62 is connected to the comparator 61.
The output terminal 41 and the current detecting resistor 46 are connected to the inverting input terminal of the comparator 61 via a resistor 72, and a reference power supply line 73 connected to the constant voltage circuit 51 is connected to the inverting input terminal of the comparator 61 via a resistor 74. It is connected between the input terminal and the resistor 72. An inverter 5 is connected to one end of the voltage dividing resistor 62.
The high-current control circuit 64 1 is connected to the other end of the voltage dividing resistor 62 via the amplifier 54.
【００２６】高電流制御回路６４1 は、比較器６６、抵
抗６７、ＮＯＲゲート６８およびフリップフロップ６９
を有するものである。而して比較器６６の非反転入力端
子には出力端子４１および電流検出用抵抗４６間が抵抗
７５を介して接続され、反転入力端子には差動増幅器５
８がダイオード７０を介して接続されるとともに抵抗６
７を介して接地される。またＮＯＲゲート６８には、比
較器６６の出力および増幅器５４の出力が並行して入力
され、該ＮＯＲゲート６８の出力はフリップフロップ６
９に入力される。The high current control circuit 64 1 includes a comparator 66, a resistor 67, a NOR gate 68, and a flip-flop 69
It has. The non-inverting input terminal of the comparator 66 is connected between the output terminal 41 and the current detecting resistor 46 via the resistor 75, and the differential amplifier 5 is connected to the inverting input terminal.
8 is connected via a diode 70 and a resistor 6
7 is grounded. The output of the comparator 66 and the output of the amplifier 54 are input to the NOR gate 68 in parallel, and the output of the NOR gate 68 is
9 is input.
【００２７】この高電流制御回路６４1 では、燃料噴射
用電磁弁７を開弁せしめるべく機関作動制御ユニットＵ
F から入力端子３７にローレベルの指令信号が入力され
たときには、そのローレベルの信号の立ち下がりに応じ
て立ち上がるとともに、作動コイル２３を流れる電流が
差動増幅器６７の出力で定まる電流以上となるのに応じ
て立ち下がるハイレベルの電圧信号が、フリップフロッ
プ６９から出力されることになる。In the high current control circuit 64 1 , the engine operation control unit U is operated to open the fuel injection solenoid valve 7.
When a low-level command signal is input from F to the input terminal 37, the signal rises in response to the fall of the low-level signal, and the current flowing through the working coil 23 becomes equal to or greater than the current determined by the output of the differential amplifier 67. Is output from the flip-flop 69.
【００２８】電界効果トランジスタ４８は、フォトカプ
ラ７０を構成要素の１つとする駆動回路７１でオン・オ
フ駆動されるものであり、該駆動回路７１は高電流制御
回路６４1 の出力に応じて作動する。而して駆動回路７
１は、高電流制御回路６４1からハイレベルの電圧信号
が入力されたときに電界効果トランジスタ４８を導通さ
せ、高電流制御回路６４1 の出力がローレベルとなるの
に応じて電界効果トランジスタ４８を遮断させることに
なる。The field effect transistor 48 is driven on and off by a drive circuit 71 having a photocoupler 70 as one of the constituent elements. The drive circuit 71 operates according to the output of the high current control circuit 64 1. I do. Thus, the driving circuit 7
1, to conduct a field effect transistor 48 when the high-level voltage signal from the high current control circuit 64 1 is input, field effect transistor according to an output of the high-current control circuit 64 1 is at low level 48 Will be cut off.
【００２９】このような駆動ユニットＵD1によると、図
４（ａ）で示すように、燃料噴射用電磁弁７を開弁せし
めるべく機関作動制御ユニットＵF から入力端子３７に
ローレベルの指令信号が入力されたときには、高電流制
御回路６４1 からは図４（ｂ）で示すように指令信号の
立ち下がりに応じたハイレベルの信号が出力され、それ
により電界効果トランジスタ４８が図４（ｃ）で示すよ
うにオン・オフ作動するとともに、スイッチ回路４５が
図４（ｄ）で示すようにオン・オフ作動する。その結
果、作動コイル２３の励磁電流が図４（ｅ）で示すよう
に制御されることになる。すなわち入力端子３７へのロ
ーレベルの指令信号入力に応じて、高電流制御回路６４
1 からハイレベルの信号が出力されるのに応じて、電界
効果トランジスタ４８およびスイッチ回路４５がオン作
動することにより昇圧回路４７からの高電圧による高電
流が作動コイル２３に供給されるが、作動コイル２３を
流れる電流が差動増幅器６７の出力で定まる電流以上と
なったときに高電流制御回路６４1 の出力がローレベル
となるのに応じて電界効果トランジスタ４８およびスイ
ッチ回路４５がオフ状態となり、作動コイル２３への励
磁電流供給が遮断される。而してその励磁電流供給遮断
後には電流検出用抵抗４６および作動コイル２３間の電
位が低下するが、その電位が差動増幅器５９の出力で定
まる電位未満となるのに応じた低電流制御回路６０から
のハイレベル信号出力により、スイッチ回路４５がオン
作動して外部電源３５のみが作動コイル２３に接続され
た状態となる。而して励磁電流がわずかに増加し、電流
検出用抵抗４６および作動コイル２３間の電位が差動増
幅器５９の出力で定まる電位以上となるのに応じた低電
流制御回路６０からのローレベル信号出力により、スイ
ッチ回路４５がオフ状態となる。したがってスイッチ回
路４５はオン・オフ作動を繰り返し、作動コイル２３へ
の供給励磁電流は比較的低いレベルでほぼ一定に保たれ
ることになる。[0029] According to such a drive unit U D1, as shown in FIG. 4 (a), the command signal of a low level to the engine operation control unit U input from the F terminal 37 to allowed to open the fuel injection solenoid valve 7 when There is input, from the high current control circuit 64 1 is output a high level signal in response to the falling edge of the command signal as shown in FIG. 4 (b), whereby the field effect transistor 48 in FIG. 4 (c 4), the switch circuit 45 is turned on and off as shown in FIG. 4D. As a result, the exciting current of the working coil 23 is controlled as shown in FIG. That is, in response to the input of a low-level command signal to the input terminal 37, the high current control circuit 64
In response to the output of a high-level signal from 1 , the field effect transistor 48 and the switch circuit 45 are turned on to supply a high current due to a high voltage from the booster circuit 47 to the operating coil 23. field effect transistor 48 and the switching circuit 45 is turned off in response to the output of the high current control circuit 64 1 becomes low level when the current through the coil 23 is equal to or larger than the current determined by the output of the differential amplifier 67 , The supply of the exciting current to the working coil 23 is cut off. After the supply of the exciting current is cut off, the potential between the current detecting resistor 46 and the operating coil 23 decreases, but the low current control circuit responds to the fact that the potential becomes lower than the potential determined by the output of the differential amplifier 59. The switch circuit 45 is turned on by the output of the high level signal from 60, and only the external power supply 35 is connected to the operating coil 23. Thus, the low level signal from the low current control circuit 60 corresponding to the fact that the exciting current slightly increases and the potential between the current detecting resistor 46 and the working coil 23 becomes higher than the potential determined by the output of the differential amplifier 59 By the output, the switch circuit 45 is turned off. Therefore, the switch circuit 45 repeats the ON / OFF operation, and the exciting current supplied to the operating coil 23 is maintained at a relatively low level and substantially constant.
【００３０】次にこの第１実施例の作用について説明す
ると、燃料噴射用電磁弁７の開弁時においてその弁体２
５を吸引作動せしめる吸引初期時には高電流制御回路６
４1により励磁電流が制御されるものであるが、その励
磁電流の最大値は、高電流制御回路６４1 の出力がハイ
レベルからローレベルに変化する時期、すなわち差動増
幅器５８の出力に応じた高目標電流ＩH で制御されるこ
とになり、また吸引保持時には低電流制御回路６０によ
るスイッチ回路４５のオン・オフ制御により制御される
ものであるが、その励磁電流の最大値は、差動増幅器５
９の出力に応じた低目標電流ＩL で制御されることにな
る。しかも差動増幅器５８，５９の出力は差動増幅器５
７すなわち燃料供給圧ＰF および吸気負圧ＰB 間の差圧
（ＰF −ＰB ）に応じて定まるものであり、高目標電流
ＩH および低目標電流ＩL は、図５および図６でそれぞ
れ示すように、燃料供給圧ＰF および吸気負圧ＰB 間の
差圧（ＰF −ＰB ）に応じて定まることになる。これに
より、燃料供給圧ＰF および吸気負圧ＰB 間の差圧（Ｐ
F −ＰB ）が比較的小さいときに定まる高目標電流ＩH1
および低目標電流ＩL1に応じて作動コイル２３の励磁電
流が図４（ｅ）の実線で示すように制御されるのに対
し、燃料供給圧ＰF および吸気負圧ＰB 間の差圧（ＰF
−ＰB ）が比較的大きいときに定まる高目標電流ＩH2お
よび低目標電流ＩL2に応じて作動コイル２３の励磁電流
が図４（ｅ）の破線で示すように制御されることにな
る。Next, the operation of the first embodiment will be described. When the fuel injection solenoid valve 7 is opened, the valve body 2 is opened.
High-current control circuit 6 at the initial stage of suction for causing suction operation of
4 1 by but exciting current and is controlled, the maximum value of the exciting current, the time the output of the high-current control circuit 64 1 is changed from the high level to the low level, i.e. corresponding to the output of the differential amplifier 58 Is controlled by the high target current I H , and is controlled by the on / off control of the switch circuit 45 by the low current control circuit 60 at the time of suction holding. The maximum value of the excitation current is Dynamic amplifier 5
9 is controlled by the low target current I L according to the output of FIG. Moreover, the outputs of the differential amplifiers 58 and 59 are
7 ie those determined according to the fuel supply pressure P F and the pressure difference between the intake negative pressure P B (P F -P B) , a high target current I H and a low target current I L, 5 and 6 in as shown respectively, it will be determined according to the fuel supply pressure P F and the pressure difference between the intake negative pressure P B (P F -P B) . Thus, the fuel supply pressure P F and the pressure difference between the intake negative pressure P B (P
F− P B ) is a high target current I H1 determined when it is relatively small.
And the exciting current of the exciting coil 23 in response to a low target current I L1 is controlled as shown by the solid line shown in FIG. 4 (e) to the fuel supply pressure P F and the pressure difference between the intake negative pressure P B ( P F
The exciting current of the working coil 23 is controlled as indicated by the broken line in FIG. 4E according to the high target current I H2 and the low target current I L2 determined when −P B ) is relatively large.
【００３１】このようにして、燃料噴射量制御を広範囲
かつ微妙に行なうため、ならびにダイナミックレンジを
広げるために、燃料噴射用電磁弁７への燃料供給圧を機
関の運転状態に応じて可変制御した際に、吸引初期時の
高目標電流ＩH ならびに吸引保持時の低目標電流Ｉ
L が、燃料供給圧ＰF および吸気負圧ＰB 間の差圧に応
じてそれぞれ設定されることになるので、燃料噴射用電
磁弁７の耐久信頼性および効率の向上を図ることが可能
となる。In this way, the fuel supply pressure to the fuel injection solenoid valve 7 is variably controlled in accordance with the operating state of the engine in order to perform the fuel injection amount control over a wide range and delicately, and to widen the dynamic range. At this time, the high target current I H at the beginning of suction and the low target current I
L is, it means that are respectively set in accordance with the differential pressure between the fuel supply pressure P F and the intake negative pressure P B, and possible to improve the durability and reliability and efficiency of the fuel injection solenoid valve 7 Become.
【００３２】すなわち燃料噴射用電磁弁７の弁体２５が
弁座１８に着座している状態では、可動コア２４および
弁体２５には、戻しばね３０のばね力に加えて燃料供給
圧Ｐ F および吸気負圧ＰB 間の差圧に応じた閉弁方向の
力が作用しているが、弁体２５を開弁方向に作動させる
励磁力を発揮させるための励磁電流を、前記差圧に応じ
て制御することにより、充分な作動応答性を確保しつつ
弁体２５が必要以上の力で開弁作動することを回避し
て、ストッパ３１の固定コア２０への衝突に伴う変形を
防止して耐久信頼性の低下を防止することができるとと
もに、必要充分な励磁電流によって弁体２５を作動させ
ることにより効率の向上を図ることが可能となる。That is, the valve body 25 of the fuel injection solenoid valve 7 is
In the state of sitting on the valve seat 18, the movable core 24 and
Fuel is supplied to the valve body 25 in addition to the spring force of the return spring 30.
Pressure P FAnd intake negative pressure PBValve closing direction according to the differential pressure between
Operates the valve body 25 in the valve opening direction although a force is acting
The exciting current for exerting the exciting force depends on the differential pressure.
Control to ensure sufficient operation responsiveness.
Avoid opening the valve 25 with excessive force.
The deformation caused by the collision of the stopper 31 with the fixed core 20
To prevent a drop in durability reliability.
In addition, the valve body 25 is operated by the necessary and sufficient exciting current.
This makes it possible to improve efficiency.
【００３３】なお、燃料供給圧ＰF に比べて吸気負圧Ｐ
B は小さいものであるので、吸気負圧ＰB の変化を無視
し、燃料供給圧ＰF の変化のみに追随して励磁電流を制
御するようにしてもよい。It should be noted, intake as compared to the fuel supply pressure P F negative pressure P
Since B is small, ignoring the change in the intake negative pressure P B, it may control the excitation current to follow only the change in the fuel supply pressure P F.
【００３４】図７、図８および図９は本発明の第２実施
例を示すものであり、上記第１実施例に対応する部分に
は同一の参照符号を付す。FIGS. 7, 8 and 9 show a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are denoted by the same reference numerals.
【００３５】先ず図７において、この駆動ユニットＵD2
の高電流制御回路６４2 は、比較器６６、分圧抵抗７６
およびＮＯＲゲート６９を備えるものであり、比較器６
６の反転入力端子には高目標電流に対応する基準値を定
めるための分圧抵抗７６が接続され、比較器６６および
時間設定手段７７の出力がＮＯＲゲート６８に並行して
入力され、該ＮＯＲゲート６８の出力は駆動回路７１に
与えられる。また低電流制御回路６０における分圧抵抗
６２の一端がインバータ５５を介して増幅器５４に接続
されるのは第１実施例と同様であるが、分圧抵抗６２の
他端は時間設定手段７７に接続される。First, in FIG. 7, this drive unit U D2
The high current control circuit 64 2 includes a comparator 66 and a voltage dividing resistor 76.
And a NOR gate 69.
6 is connected to a voltage-dividing resistor 76 for determining a reference value corresponding to the high target current. The outputs of the comparator 66 and the time setting means 77 are input to the NOR gate 68 in parallel. The output of gate 68 is provided to drive circuit 71. Also, one end of the voltage dividing resistor 62 in the low current control circuit 60 is connected to the amplifier 54 via the inverter 55 as in the first embodiment, but the other end of the voltage dividing resistor 62 is connected to the time setting means 77. Connected.
【００３６】時間設定手段７７は、燃料噴射用電磁弁７
を開弁せしめるべく機関作動制御ユニットＵF から入力
端子３７にローレベルの指令信号が入力されたときに、
増幅器５４から入力される信号の立ち下がりに応じて、
差動増幅器５７の出力、すなわち燃料供給圧ＰF および
吸気負圧ＰB 間の差圧（ＰF −ＰB ）に応じて図８で定
まる時間Ｔだけ持続するハイレベルの信号を出力するも
のであり、ＮＯＲゲート６８は、燃料噴射用電磁弁７の
開弁初期に時間Ｔだけ持続するハイレベルの信号を出力
することになる。The time setting means 77 includes the fuel injection solenoid valve 7.
When the command signal of a low level is input to the input terminal 37 from the engine operation control unit U F to allowed to open,
In response to the fall of the signal input from the amplifier 54,
The output of the differential amplifier 57, i.e., outputs a high level signal that lasts for a time T which is determined in FIG. 8 according to the fuel supply pressure P F and the pressure difference between the intake negative pressure P B (P F -P B) The NOR gate 68 outputs a high-level signal that lasts for the time T at the beginning of the opening of the fuel injection solenoid valve 7.
【００３７】而して、燃料噴射用電磁弁７の開弁時にお
いて図９（ａ）で示すように、燃料噴射用電磁弁７を開
弁せしめるべく機関作動制御ユニットＵF から入力端子
３７にローレベルの指令信号が入力されたときには、高
電流制御回路６４2 からは図９（ｂ）で示すように指令
信号の立ち下がりに応じたハイレベルの信号が出力さ
れ、それにより電界効果トランジスタ４８が図９（ｃ）
で示すようにオン・オフ作動するとともに、スイッチ回
路４５が図９（ｄ）で示すようにオン・オフ作動する。
その結果、作動コイル２３の励磁電流が図９（ｅ）で示
すように制御されることになる。[0037] In Thus, at the time of valve opening of the fuel injection solenoid valve 7 as shown in FIG. 9 (a), the fuel injection solenoid valve 7 in the engine operation control unit U input from the F terminal 37 to allowed to open when the command signal of a low level is input, a high level signal in response to the falling edge of the command signal as shown in Figure 9 from the high current control circuit 64 2 (b) is output, whereby the field effect transistor 48 Is shown in FIG. 9 (c).
In addition to the on / off operation shown in FIG. 9, the switch circuit 45 is turned on / off as shown in FIG.
As a result, the exciting current of the working coil 23 is controlled as shown in FIG.
【００３８】しかも吸引初期時には、燃料供給圧ＰF お
よび吸気負圧ＰB 間の差圧（ＰF −ＰB ）が比較的小さ
いときに定まる設定時間Ｔ1 だけの高目標電流ＩH によ
る制御に応じて作動コイル２３の励磁電流が図９（ｅ）
の実線で示すように制御されるのに対し、燃料供給圧Ｐ
F および吸気負圧ＰB 間の差圧（ＰF −ＰB ）が比較的
大きいときに定まる設定時間Ｔ2 だけの高目標電流ＩH
による制御に応じて作動コイル２３の励磁電流が図９
（ｅ）の破線で示すように制御されることになる。[0038] Moreover when the suction initially, controlled by the high target current I H of only differential pressure (P F -P B) is determined when a relatively small set time T 1 of the inter-fuel supply pressure P F and the intake negative pressure P B As shown in FIG. 9 (e),
Is controlled as shown by the solid line, while the fuel supply pressure P
A high target current I H for a set time T 2 determined when the pressure difference (P F −P B ) between F and the intake negative pressure P B is relatively large.
The exciting current of the working coil 23 is
The control is performed as shown by the broken line in (e).
【００３９】このようにして、吸引初期時に弁体２５を
開弁方向に作動させる励磁力を発揮させるための励磁電
流供給時間を、前記差圧に応じて制御することにより、
充分な作動応答性を確保しつつ弁体２５が必要以上の力
で開弁作動することを回避して、耐久信頼性の低下を防
止することができるとともに効率の向上を図ることが可
能となる。As described above, the excitation current supply time for exerting the excitation force for operating the valve body 25 in the valve opening direction at the initial stage of suction is controlled according to the differential pressure.
It is possible to prevent the valve body 25 from opening with excessive force while ensuring sufficient operation responsiveness, to prevent a reduction in durability reliability and to improve efficiency. .
【００４０】上記実施例では、アナログ的に構成された
駆動ユニットＵD1，ＵD2により燃料噴射用電磁弁７の作
動を制御するようにしたが、コンピュータのプログラム
により励磁電流を制御するようにしてもよく、また吸気
負圧および燃料供給圧の相対値を演算する手段、該相対
値に応じて高および低目標電流を設定する手段、ならび
に前記相対値に応じて吸引初期時の高目標電流による励
磁電流制御時間を定める手段は、駆動ユニット内になく
ても機関の運転制御にかかわるシステム中に設けられて
いればよい。In the above-described embodiment, the operation of the fuel injection solenoid valve 7 is controlled by the drive units U D1 and U D2 configured in an analog manner. However, the excitation current is controlled by a computer program. Means for calculating relative values of the intake negative pressure and the fuel supply pressure, means for setting high and low target currents according to the relative values, and high target current at the beginning of suction according to the relative values. The means for determining the exciting current control time need not be provided in the drive unit, but may be provided in a system relating to the operation control of the engine.
【００４１】以上、本発明の実施例を詳述したが、本発
明は上記実施例に限定されるものではなく、特許請求の
範囲に記載された本発明を逸脱することなく種々の設計
変更を行なうことが可能である。Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.
【００４２】[0042]
【発明の効果】以上のように請求項１記載の発明に従う
装置は、燃料供給圧変更手段から燃料噴射用電磁弁への
燃料供給圧を検出する燃料供給圧検出器と、該燃料供給
圧に基づいて吸引初期時の高目標電流を定める吸引初期
用目標値設定手段と、前記燃料供給圧に基づいて吸引保
持時の低目標電流を定める吸引保持用目標値設定手段と
を備えるので、燃料供給圧に応じて励磁電流を制御し
て、燃料噴射用電磁弁の作動劣化を回避し、効率の向上
を図ることが可能となる。As described above, the apparatus according to the first aspect of the present invention comprises a fuel supply pressure detector for detecting the fuel supply pressure from the fuel supply pressure changing means to the fuel injection solenoid valve, and a fuel supply pressure detector for detecting the fuel supply pressure. A suction initial target value setting means for determining a high target current at the time of initial suction based on the fuel supply pressure; and a suction holding target value setting means for determining a low target current during suction holding based on the fuel supply pressure. By controlling the exciting current in accordance with the pressure, it is possible to avoid the operation deterioration of the fuel injection solenoid valve and to improve the efficiency.
【００４３】また請求項２記載の発明に従う装置は、上
記請求項１記載の発明の構成に加えて、内燃機関の吸気
負圧を検出する吸気負圧検出器と、該吸気負圧および燃
料供給圧の相対値を演算する相対値演算手段とを備え、
両目標値設定手段は、前記相対値に応じて高および低目
標電流を設定すべく構成されるので、より精密な制御が
可能となる。According to a second aspect of the present invention, in addition to the configuration of the first aspect, an intake negative pressure detector for detecting an intake negative pressure of an internal combustion engine, and the intake negative pressure and fuel supply are provided. Relative value calculating means for calculating a relative value of the pressure,
Since both target value setting means are configured to set the high and low target currents according to the relative values, more precise control is possible.
【００４４】さらに請求項３記載の発明に従う装置は、
燃料供給圧変更手段から燃料噴射用電磁弁への燃料供給
圧を検出する燃料供給圧検出器と、吸引初期時の高目標
電流による励磁電流制御時間を前記燃料供給圧に基づい
て定める時間設定手段と、前記燃料供給圧に基づいて吸
引保持時の低目標電流を定める目標値設定手段とを備え
るので、燃料供給圧に応じて吸引初期時の励磁電流時間
を制御するとともに吸引保持時の励磁電流を制御して、
燃料噴射用電磁弁の作動劣化を回避し、効率を向上する
ことができる。An apparatus according to a third aspect of the present invention comprises:
A fuel supply pressure detector for detecting a fuel supply pressure from the fuel supply pressure changing means to the fuel injection solenoid valve; and a time setting means for determining an exciting current control time based on the high target current at the beginning of suction based on the fuel supply pressure. And target value setting means for setting a low target current during suction holding based on the fuel supply pressure, so that the excitation current time at the beginning of suction is controlled according to the fuel supply pressure and the excitation current during suction holding is controlled. Control the
Deterioration of operation of the fuel injection solenoid valve can be avoided, and efficiency can be improved.
【図１】第１実施例の燃料噴射制御装置の構成を示す図
である。FIG. 1 is a diagram illustrating a configuration of a fuel injection control device according to a first embodiment.
【図２】燃料噴射用電磁弁の縦断面図である。FIG. 2 is a vertical sectional view of a fuel injection solenoid valve.
【図３】駆動ユニットの回路構成図である。FIG. 3 is a circuit configuration diagram of a drive unit.
【図４】タイミングチャートである。FIG. 4 is a timing chart.
【図５】吸気負圧および燃料供給圧の相対値に応じた高
目標電流を示す図である。FIG. 5 is a diagram showing a high target current according to the relative values of the intake negative pressure and the fuel supply pressure.
【図６】吸気負圧および燃料供給圧の相対値に応じた低
目標電流を示す図である。FIG. 6 is a diagram showing a low target current according to the relative values of the intake negative pressure and the fuel supply pressure.
【図７】第２実施例の駆動ユニットの回路構成図であ
る。FIG. 7 is a circuit configuration diagram of a drive unit according to a second embodiment.
【図８】吸気負圧および燃料供給圧の相対値に応じた設
定時間を示す図である。FIG. 8 is a diagram showing a set time according to a relative value of an intake negative pressure and a fuel supply pressure.
【図９】タイミングチャートである。FIG. 9 is a timing chart.
７ 燃料噴射用電磁弁 ８ 燃料供給圧変更手段としての電磁制御弁 ９ 燃料供給源 １２ 燃料供給圧検出器 ２３ 作動コイル ２５ 弁体 ５７ 相対値演算手段としての差動増幅器 ５８ 吸引初期用目標値設定手段としての差動
増幅器 ５９ 吸引保持用目標値設定手段としての差動
増幅器 ７７ 時間設定手段7 Solenoid valve for fuel injection 8 Electromagnetic control valve as fuel supply pressure changing means 9 Fuel supply source 12 Fuel supply pressure detector 23 Operating coil 25 Valve 57 Differential amplifier as relative value calculation means 58 Target value setting for initial suction Differential amplifier as means 59 Differential amplifier as suction holding target value setting means 77 Time setting means
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F02M 51/00 F02D 41/20 330 F02D 41/32 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) F02M 51/00 F02D 41/20 330 F02D 41/32
Claims (3)
応じて弁体（２５）が開弁方向に吸引作動せしめられる
燃料噴射用電磁弁（７）が、燃料供給圧を可変とした燃
料供給圧変更手段（８）を介して燃料供給源（９）に接
続され、弁体（２５）をその閉弁状態から開弁方向に作
動せしめる吸引初期時には高目標電流で前記作動コイル
（２３）の励磁電流が制御され、弁体（２５）を開弁状
態に保持する吸引保持時には低目標電流で前記作動コイ
ル（２３）の励磁電流が制御される内燃機関の燃料噴射
制御装置において、燃料供給圧変更手段（８）から燃料
噴射用電磁弁（７）への燃料供給圧を検出する燃料供給
圧検出器（１２）と、該燃料供給圧に基づいて吸引初期
時の高目標電流を定める吸引初期用目標値設定手段（５
８）と、前記燃料供給圧に基づいて吸引保持時の低目標
電流を定める吸引保持用目標値設定手段（５９）とを備
えることを特徴とする内燃機関の燃料噴射制御装置。1. A fuel injection solenoid valve (7) in which a valve body (25) is operated to be attracted in an opening direction in response to an excitation current supply to an operation coil (23), wherein a fuel supply pressure is varied. The operation coil (23) is connected to the fuel supply source (9) via the supply pressure changing means (8) and operates at a high target current at the initial stage of suction for operating the valve body (25) from the closed state to the valve opening direction. In the fuel injection control device for an internal combustion engine, the exciting current of the operating coil (23) is controlled with a low target current at the time of suction holding for holding the valve body (25) in the valve open state. A fuel supply pressure detector (12) for detecting a fuel supply pressure from the pressure changing means (8) to the fuel injection solenoid valve (7), and a suction for determining a high target current at the beginning of suction based on the fuel supply pressure; Initial target value setting means (5
8) and a suction holding target value setting means (59) for determining a low target current during suction holding based on the fuel supply pressure.
検出器（１４）と、該吸気負圧および燃料供給圧の相対
値を演算する相対値演算手段（５７）とを備え、両目標
値設定手段（５８，５９）は、前記相対値に応じて高お
よび低目標電流を設定すべく構成されることを特徴とす
る請求項１記載の内燃機関の燃料噴射制御装置。2. An intake negative pressure detector (14) for detecting an intake negative pressure of an internal combustion engine, and relative value calculating means (57) for calculating a relative value of the intake negative pressure and a fuel supply pressure. 2. The fuel injection control device for an internal combustion engine according to claim 1, wherein the target value setting means (58, 59) is configured to set a high and a low target current according to the relative value.
応じて弁体（２５）が開弁方向に吸引作動せしめられる
燃料噴射用電磁弁（７）が、燃料供給圧を可変とした燃
料供給圧変更手段（８）を介して燃料供給源（９）に接
続され、弁体（２５）をその閉弁状態から開弁方向に作
動せしめる吸引初期時には高目標電流で前記作動コイル
（２３）の励磁電流が制御され、弁体（２５）を開弁状
態に保持する吸引保持時には低目標電流で前記作動コイ
ル（２３）の励磁電流が制御される内燃機関の燃料噴射
制御装置において、燃料供給圧変更手段（８）から燃料
噴射用電磁弁（７）への燃料供給圧を検出する燃料供給
圧検出器（１２）と、吸引初期時の高目標電流による励
磁電流制御時間を前記燃料供給圧に基づいて定める時間
設定手段（７７）と、前記燃料供給圧に基づいて吸引保
持時の低目標電流を定める目標値設定手段（５９）とを
備えることを特徴とする内燃機関の燃料噴射制御装置。3. A fuel injection solenoid valve (7) in which a valve body (25) is attracted in a valve opening direction in response to an excitation current supply to an operation coil (23), wherein a fuel supply pressure is varied. The operation coil (23) is connected to the fuel supply source (9) via the supply pressure changing means (8) and operates at a high target current at the initial stage of suction for operating the valve body (25) from the closed state to the valve opening direction. In the fuel injection control device for an internal combustion engine, the exciting current of the operating coil (23) is controlled with a low target current at the time of suction holding for holding the valve body (25) in the valve open state. A fuel supply pressure detector (12) for detecting a fuel supply pressure from the pressure changing means (8) to the fuel injection solenoid valve (7), and an excitation current control time based on a high target current at the beginning of suction. Time setting means (77) determined based on And a target value setting means (59) for determining a low target current at the time of suction holding based on the fuel supply pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02523793A JP3286371B2 (en) | 1993-02-15 | 1993-02-15 | Fuel injection control device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02523793A JP3286371B2 (en) | 1993-02-15 | 1993-02-15 | Fuel injection control device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06241137A JPH06241137A (en) | 1994-08-30 |
| JP3286371B2 true JP3286371B2 (en) | 2002-05-27 |
Family
ID=12160382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02523793A Expired - Fee Related JP3286371B2 (en) | 1993-02-15 | 1993-02-15 | Fuel injection control device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3286371B2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11148439A (en) | 1997-06-26 | 1999-06-02 | Hitachi Ltd | Electromagnetic fuel injection valve and its fuel injection method |
| DE19833830A1 (en) | 1998-07-28 | 2000-02-03 | Bosch Gmbh Robert | System for energizing magnetic valves controlling fuel injection in IC engine, using increased starting voltage and engine operating characteristic(s) |
| JP3768723B2 (en) * | 1999-04-20 | 2006-04-19 | 三菱電機株式会社 | Fuel injection control device |
| JP3932474B2 (en) | 1999-07-28 | 2007-06-20 | 株式会社日立製作所 | Electromagnetic fuel injection device and internal combustion engine |
| JP4110751B2 (en) | 2001-06-18 | 2008-07-02 | 株式会社日立製作所 | Injector drive control device |
| JP4037632B2 (en) * | 2001-09-28 | 2008-01-23 | 株式会社日立製作所 | Control device for internal combustion engine provided with fuel injection device |
| JP2004092573A (en) | 2002-09-03 | 2004-03-25 | Hitachi Ltd | Fuel injection device and control method |
| JP2008291778A (en) * | 2007-05-25 | 2008-12-04 | Denso Corp | Solenoid valve control device |
| JP4917556B2 (en) * | 2008-01-07 | 2012-04-18 | 日立オートモティブシステムズ株式会社 | Fuel injection control device for internal combustion engine |
| JP5542884B2 (en) * | 2012-08-30 | 2014-07-09 | 三菱電機株式会社 | In-vehicle engine controller |
| JP5815590B2 (en) * | 2013-04-05 | 2015-11-17 | 本田技研工業株式会社 | Solenoid valve drive |
| JP7110736B2 (en) * | 2018-05-31 | 2022-08-02 | 株式会社デンソー | Control device for fuel injection valve and fuel injection system |
-
1993
- 1993-02-15 JP JP02523793A patent/JP3286371B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06241137A (en) | 1994-08-30 |
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