JP2747592B2 - Fuel injection device for internal combustion engine - Google Patents
Fuel injection device for internal combustion engineInfo
- Publication number
- JP2747592B2 JP2747592B2 JP63297534A JP29753488A JP2747592B2 JP 2747592 B2 JP2747592 B2 JP 2747592B2 JP 63297534 A JP63297534 A JP 63297534A JP 29753488 A JP29753488 A JP 29753488A JP 2747592 B2 JP2747592 B2 JP 2747592B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- pressure
- valve
- fuel pump
- fuel injection
- 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
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- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【発明の詳細な説明】 ［発明の属する技術分野］ この発明は、内燃機関に燃料を供給する内燃機関の燃
料噴射装置に関する。Description: TECHNICAL FIELD The present invention relates to a fuel injection device for an internal combustion engine that supplies fuel to the internal combustion engine.
［従来の技術］ 内燃機関には燃料噴射装置を備えられ、この燃料噴射
装置には、燃料タンクに燃料通路を設け、この燃料通路
の途中に燃料ポンプを配置し、この燃料通路の内燃料ポ
ンプの下流側に、この下流側の圧力が高い時開弁し、燃
料ポンプの下流側の燃料を上流側に戻す圧力調整弁を配
置し、運転状態に対応した量の燃料を噴射する燃料噴射
弁を燃料ポンプの下流側の燃料通路に配置し、運転状態
に対応して燃料噴射弁を駆動するための駆動信号のパル
ス幅を制御する燃料噴射弁駆動回路を備えたものがあ
り、燃料噴射弁を運転状態に対応して駆動し、運転状態
に対応した量の燃料を噴射するようにしている。また、
駆動信号のパルスが到達しないで燃料噴射弁が閉となっ
ている期間において、燃料ポンプ下流側の燃料通路が締
めきり状態となり、この下流側の圧力が上昇すると圧力
調整弁が開となり、燃料ポンプに過大な負荷が作用しな
いようにしている。2. Description of the Related Art An internal combustion engine is provided with a fuel injection device. In the fuel injection device, a fuel passage is provided in a fuel tank, and a fuel pump is disposed in the middle of the fuel passage. A fuel injection valve that opens when the pressure on the downstream side is high and that returns the fuel on the downstream side of the fuel pump to the upstream side, and injects an amount of fuel corresponding to the operation state. Is disposed in the fuel passage downstream of the fuel pump, and includes a fuel injection valve drive circuit that controls the pulse width of a drive signal for driving the fuel injection valve according to the operating state. Is driven in accordance with the operation state, and the amount of fuel corresponding to the operation state is injected. Also,
During the period in which the fuel injection valve is closed without the pulse of the drive signal reaching, the fuel passage downstream of the fuel pump is closed, and when the pressure on the downstream side increases, the pressure regulating valve opens, and the fuel pump is opened. So that excessive load does not act on it.
また、このような燃料噴射装置では、燃料ポンプの吐
出能力を変化させるために、例えば抵抗を接続した回路
と、この抵抗をバイパスする回路を備え、低回転域では
抵抗を有する回路で燃料ポンプを駆動して吐出能力を低
下させ、高回転域では抵抗をバイパスする回路で駆動し
て吐出能力を増加させるものがある。In addition, such a fuel injection device includes, for example, a circuit connected to a resistor and a circuit bypassing the resistor in order to change the discharge capacity of the fuel pump. In some cases, the discharge capacity is reduced by driving the drive, and the discharge capacity is increased by driving the circuit in a high rotational speed region by bypassing a resistor.
［発明が解決しようとする課題］ ところで、運転状態に対応して最多量の燃料を噴射可
能とするためには、燃料ポンプの吐出量を大きく設定す
る必要がある。しかし、運転状態に対応して最少量の燃
料を噴射する時燃料ポンプの吐出量の大部分は圧力調整
弁から、燃料ポンプの上流側に戻ることになり、燃料ポ
ンプは不要に燃料を循環させることとなる。これにより
無駄にエネルギーが消費されるのみでなく、循環する燃
料の温度を上昇させる問題がある。[Problems to be Solved by the Invention] By the way, in order to be able to inject the maximum amount of fuel according to the operation state, it is necessary to set a large discharge amount of the fuel pump. However, when injecting the minimum amount of fuel according to the operation state, most of the discharge amount of the fuel pump returns from the pressure regulating valve to the upstream side of the fuel pump, and the fuel pump circulates the fuel unnecessarily. It will be. This not only wastes energy but also raises the temperature of the circulating fuel.
また、燃料ポンプの吐出能力を切換るのに、抵抗を接
続した回路と、この抵抗をバイパスする回路の２つの回
路を用いて切換えており、回路素子が多く回路構成が複
雑である。燃料ポンプの吐出能力は２段階に切換えるも
のであり、これ以上の切換えを行なうようにするには、
切換段数に応じた抵抗が必要となる等の不具合がある。Further, the switching of the discharge capacity of the fuel pump is performed by using two circuits, a circuit connecting a resistor and a circuit bypassing the resistor, and the circuit configuration is complicated because there are many circuit elements. The discharge capacity of the fuel pump is switched in two stages, and in order to perform further switching,
There is a problem that a resistor corresponding to the number of switching stages is required.
この発明はかかる点に鑑みなされたもので、簡単な回
路構成で、燃料ポンプの吐出圧力を運転状態に対応して
安定して変化でき、燃料噴射量のダイナミックレンジを
拡げることができる内燃機関の燃料噴射装置を提供する
ことを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a simple circuit configuration, and is capable of stably changing a discharge pressure of a fuel pump in accordance with an operation state, and expanding a dynamic range of a fuel injection amount. It is an object to provide a fuel injection device.
［課題を解決するための手段］ 前記課題を解決し、かつ目的を達成するために、請求
項１記載の発明は、燃料タンクに燃料通路を設け、この
燃料通路の途中に燃料ポンプを配置し、この燃料通路の
内前記燃料ポンプの下流側に、この下流側の圧力が高い
時開弁し、前記燃料ポンプの下流側の燃料を上流側に戻
す圧力調整弁を配置し、運転状態に対応した量の燃料を
噴射する燃料噴射弁を前記燃料ポンプの下流側の前記燃
料通路に配置し、運転状態に対応して前記燃料噴射弁を
駆動するための駆動信号のパルス幅を制御する燃料噴射
弁駆動回路を備えた内燃機関の燃料噴射装置において、
前記燃料ポンプへの時間当たりの供給駆動電力を、低回
転あるいは低負荷域で小さく、高回転あるいは高負荷域
で大きくし、前記圧力調整弁に、この圧力調整弁が開と
なる時の設定開弁力を低回転あるいは低負荷域で小さ
く、高回転あるいは高負荷域で大きく調整するアクチュ
エータを設けたことを特徴としている。[Means for Solving the Problems] In order to solve the problems and achieve the object, the invention according to claim 1 provides a fuel passage in a fuel tank and arranges a fuel pump in the middle of the fuel passage. A pressure regulating valve that opens when the pressure on the downstream side is high and returns the fuel on the downstream side of the fuel pump to the upstream side is disposed on the downstream side of the fuel pump in the fuel passage, corresponding to the operating state. A fuel injection valve for injecting a predetermined amount of fuel in the fuel passage downstream of the fuel pump, and controlling a pulse width of a drive signal for driving the fuel injection valve in accordance with an operation state. In a fuel injection device for an internal combustion engine equipped with a valve drive circuit,
The drive power supplied to the fuel pump per hour is small in a low rotation or low load range, and large in a high rotation or high load range, and the pressure control valve is set to open when the pressure control valve is opened. The present invention is characterized in that an actuator is provided which adjusts the valve force to be small in a low rotation or low load range and to be large in a high rotation or high load range.
請求項１記載の発明により、運転状態に対応した内燃
機関の要求する燃料噴射量に対応して、燃料ポンプの吐
出量を増減するので、燃料ポンプはむだにエネルギーを
消費しない。また、燃料ポンプそのものの吐出量を増減
するので、より広い運転状態において燃料ポンプはむだ
にエネルギーを消費しない。さらに、燃料ポンプの下流
側の燃料通路の圧力が運転状態に対応して増減されるの
で、噴射圧の制御による噴射量の増減が可能となる。す
なわち、燃料噴射弁の開期間の制御による噴射量の増減
に加えて噴射量のダイナミックレンジを拡げることがで
き、その分燃料噴射弁の小型化が可能となる。According to the first aspect of the present invention, the discharge amount of the fuel pump is increased or decreased in accordance with the fuel injection amount required by the internal combustion engine corresponding to the operating state, so that the fuel pump consumes no energy. In addition, since the discharge amount of the fuel pump itself is increased or decreased, the fuel pump does not waste energy in a wider operating state. Further, since the pressure in the fuel passage downstream of the fuel pump is increased or decreased in accordance with the operating state, the injection amount can be increased or decreased by controlling the injection pressure. That is, the dynamic range of the injection amount can be expanded in addition to the increase and decrease of the injection amount by controlling the opening period of the fuel injection valve, and the fuel injection valve can be downsized accordingly.
請求項２記載の発明の内燃機関の燃料噴射装置は、請
求項１において、前記燃料通路の内前記燃料ポンプの下
流側の圧力と燃料が噴射される部位の近傍の圧力との差
に対応した開弁力が、前記設定開弁力より大なる時、前
記圧力調整弁を開とするようにしたことを特徴としてい
る。According to a second aspect of the present invention, the fuel injection device for an internal combustion engine according to the first aspect corresponds to a difference between a pressure downstream of the fuel pump in the fuel passage and a pressure near a portion where fuel is injected. When the valve opening force is greater than the set valve opening force, the pressure regulating valve is opened.
請求項２記載の発明により、噴射先の圧力をフィード
バックして噴射圧が決められ、噴射圧と噴射先の圧力差
を一定にして噴射することになる。これにより、噴射先
に圧力変動があっても、安定した量の燃料を噴射可能と
なる。According to the second aspect of the present invention, the injection pressure is determined by feeding back the pressure of the injection destination, and the injection is performed with the difference between the injection pressure and the pressure of the injection destination kept constant. As a result, a stable amount of fuel can be injected even if the pressure fluctuates at the injection destination.
［発明の実施の形態］ 以下、この発明の一実施例を添付図面に基いて詳細に
説明する。Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
第１図はこの発明が適用される内燃機関の燃料噴射装
置の概略図である。FIG. 1 is a schematic diagram of a fuel injection device for an internal combustion engine to which the present invention is applied.
燃料タンク１には燃料通路２が設けられ、この燃料通
路２には燃料タンク１内に貯溜された燃料を圧送する燃
料ポンプ３、燃料をろ過する燃料フィルタ４、燃料の圧
力変動を吸収するダンパ５、燃料の圧力を一定に調整す
る圧力調整弁６が備えられ、内燃機関の吸気通路７に備
えられた電磁式の燃料噴射弁８に一定の圧力の燃料を供
給するようになっている。The fuel tank 1 is provided with a fuel passage 2. The fuel passage 2 is provided with a fuel pump 3 for pumping the fuel stored in the fuel tank 1, a fuel filter 4 for filtering the fuel, and a damper for absorbing pressure fluctuation of the fuel. 5. A pressure regulating valve 6 for regulating the pressure of the fuel to a constant value is provided, so that fuel of a constant pressure is supplied to an electromagnetic fuel injection valve 8 provided in an intake passage 7 of the internal combustion engine.
この燃料ポンプ３はコントロールユニット９に備えら
れた制御回路10で制御されるポンプ駆動回路11で駆動さ
れ、内燃機関の運転状態に応じて燃料ポンプ３の吐出能
力を変化させ、燃料通路２の圧力を調整することができ
るようになっている。The fuel pump 3 is driven by a pump drive circuit 11 controlled by a control circuit 10 provided in the control unit 9, and changes the discharge capacity of the fuel pump 3 according to the operation state of the internal combustion engine, and changes the pressure of the fuel passage 2. Can be adjusted.
制御回路10は駆動信号のデューティ比を変化させ、ポ
ンプ駆動回路11を介して燃料ポンプ３を駆動する駆動電
力を変化する。例えば、制御回路10に第２図に示すよう
な負荷と機関回転数に基づく、燃料消費量の判別マップ
が予め記憶されており、この判別マップにより、燃料消
費量が小領域Ａと大領域Ｂの判断が行なわれる。そし
て、燃料噴射量が小領域Ａでは、第３図に示すように断
続的な駆動信号を出力し、燃料消費量が大領域Ｂでは連
続した駆動信号が出力される。The control circuit 10 changes the duty ratio of the drive signal, and changes the drive power for driving the fuel pump 3 via the pump drive circuit 11. For example, a fuel consumption discrimination map based on the load and the engine speed as shown in FIG. 2 is stored in advance in the control circuit 10, and according to this discrimination map, the fuel consumption is calculated in the small area A and the large area B. Is determined. When the fuel injection amount is in the small area A, an intermittent drive signal is output as shown in FIG. 3, and when the fuel consumption is in the large area B, a continuous drive signal is output.
ポンプ駆動回路11ではこの駆動信号に応じて例えばス
イッチング回路を開閉し、第３図に示すように、燃料ポ
ンプ３に流れる電流値を変化させて、燃料ポンプ３の吐
出能力を変える。すなわち、燃料ポンプ３への時間当た
りの供給駆動電力を、低回転あるいは低負荷域で小さ
く、高回転あるいは高負荷域で大きくしている。運転状
態に対応した内燃機関の要求する燃料噴射量に対応し
て、燃料ポンプの吐出量を増減するので、燃料ポンプは
むだにエネルギーを消費しない。The pump drive circuit 11 opens and closes, for example, a switching circuit in response to the drive signal, and changes the current value flowing through the fuel pump 3 to change the discharge capacity of the fuel pump 3 as shown in FIG. That is, the driving power supplied to the fuel pump 3 per hour is small in a low rotation or low load region and is large in a high rotation or high load region. Since the discharge amount of the fuel pump is increased or decreased in accordance with the fuel injection amount required by the internal combustion engine corresponding to the operation state, the fuel pump does not waste energy.
燃料噴射弁８は制御回路10で制御される噴射弁駆動回
路12で駆動され、内燃機関の運転状態に応じて、駆動信
号のパルス幅を制御し、吸気通路７に所定量の燃料を噴
射して、混合気を内燃機関13側へ供給するようになって
いる。The fuel injection valve 8 is driven by an injection valve drive circuit 12 controlled by a control circuit 10, controls a pulse width of a drive signal in accordance with an operation state of the internal combustion engine, and injects a predetermined amount of fuel into the intake passage 7. Thus, the air-fuel mixture is supplied to the internal combustion engine 13 side.
吸気通路７の燃料噴射弁８の下流側は配管14を介して
圧力調整弁６と連通され、さらにこの配管14には吸気圧
力検知器15が備えられている。圧力調整弁６は吸気通路
７と燃料通路２との圧力差が所定値以上になると、弁を
開いて燃料通路２を燃料タンク１側と連通させて、吸気
通路７の圧力と燃料通路２との圧力差を、自動的に常に
所定値に維持するようになっている。The downstream side of the fuel injection valve 8 in the intake passage 7 is communicated with the pressure regulating valve 6 through a pipe 14, and the pipe 14 is further provided with an intake pressure detector 15. When the pressure difference between the intake passage 7 and the fuel passage 2 becomes equal to or greater than a predetermined value, the pressure regulating valve 6 is opened to connect the fuel passage 2 with the fuel tank 1, and the pressure of the intake passage 7 and the fuel passage 2 Is automatically and always maintained at a predetermined value.
この圧力調整弁６には弁の開弁力を調整するアクチュ
エータ16が設けられ、このアクチュエータ16は制御回路
10で制御される調整弁駆動回路17で駆動される。これに
より、圧力調整弁６は弁の開弁力を内燃機関の運転状態
に応じて変化させ、例えば低回転或いは低負荷域では燃
料の圧力を低く、高回転或いは高負荷域では高くするよ
うに制御することができる。The pressure adjusting valve 6 is provided with an actuator 16 for adjusting a valve opening force of the valve.
It is driven by an adjustment valve drive circuit 17 controlled by 10. As a result, the pressure regulating valve 6 changes the valve opening force according to the operating state of the internal combustion engine. For example, the pressure of the fuel is reduced in a low rotation or low load range, and is increased in a high rotation or high load range. Can be controlled.
すなわち、圧力調整弁６に、この圧力調整弁６が開と
なる時の設定開弁力を低回転あるいは低負荷域で小さ
く、高回転あるいは高負荷域で大きく調整するアクチュ
エータ16を設けている。このように、燃料ポンプ３その
ものの吐出量を増減するので、より広い運転状態におい
て燃料ポンプ３はむだにエネルギーを消費しない。さら
に、燃料ポンプ３の下流側の燃料通路の圧力が運転状態
に対応して増減されるので、噴射圧の制御による噴射量
の増減が可能となる。すなわち、燃料噴射弁８の開期間
の制御による噴射量の増減に加えて噴射量のダイナミッ
クレンジを拡げることができ、その分燃料噴射弁８の小
型化が可能となる。That is, the pressure regulating valve 6 is provided with an actuator 16 that adjusts the set valve opening force when the pressure regulating valve 6 is opened to be small in a low rotation or low load region and large in a high rotation or high load region. As described above, since the discharge amount of the fuel pump 3 itself is increased or decreased, the fuel pump 3 does not waste energy in a wider operation state. Further, since the pressure in the fuel passage downstream of the fuel pump 3 is increased or decreased in accordance with the operating state, the injection amount can be increased or decreased by controlling the injection pressure. That is, the dynamic range of the injection amount can be expanded in addition to the increase and decrease of the injection amount by controlling the opening period of the fuel injection valve 8, and the size of the fuel injection valve 8 can be reduced accordingly.
また、燃料通路の内燃料ポンプ３の下流側の圧力と燃
料が噴射される部位の近傍の圧力との差に対応した開弁
力が、設定開弁力より大なる時、圧力調整弁６を開とす
るようにしており、噴射先の圧力をフィードバックして
噴射圧が決められ、噴射圧と噴射先の圧力差を一定にし
て噴射することになり、噴射先に圧力変動があっても、
安定した量の燃料を噴射可能となる。When the valve opening force corresponding to the difference between the pressure on the downstream side of the inner fuel pump 3 in the fuel passage and the pressure near the portion where fuel is injected is larger than the set valve opening force, the pressure regulating valve 6 is turned off. It is designed to be open, the injection pressure is determined by feeding back the pressure of the injection destination, and the injection is performed with a constant pressure difference between the injection pressure and the injection destination.
A stable amount of fuel can be injected.
燃料噴射弁８の上流側にはスロットル弁18が、さらに
その上流側にはエアクリーナ19が設けられ、このエアク
リーナ19には吸入空気温度検知器20が備えられている。
また、スロットル弁18にはスロットル位置検知器21が備
えられ、スロットル弁18の開度を検知することができる
ようになっている。A throttle valve 18 is provided upstream of the fuel injection valve 8, and an air cleaner 19 is further provided upstream thereof. The air cleaner 19 is provided with an intake air temperature detector 20.
Further, the throttle valve 18 is provided with a throttle position detector 21 so that the opening of the throttle valve 18 can be detected.
内燃機関13のピストン22に接続したクランク軸23には
突起24が設けられ、機関回転数検知器25でクランク位置
及び突起24の回転数から機関回転速度を検知し、またカ
ムシャフト位置検知器26でカムシャフト27の位置を検知
するようになっている。The crankshaft 23 connected to the piston 22 of the internal combustion engine 13 is provided with a projection 24. The engine speed detector 25 detects the engine speed from the crank position and the rotation speed of the projection 24. Detects the position of the camshaft 27.
内燃機関13の燃焼室28と吸気通路７の開閉は吸気弁29
で、また燃焼室28と排気通路30との開閉は排気弁31で行
なうようになっており、この吸気弁29及び排気弁31はそ
れぞれ所定のタイミングで開閉され、燃焼室28の近傍の
シリンダには機関温度検知器32が設けられている。The opening and closing of the combustion chamber 28 and the intake passage 7 of the internal combustion engine 13 is controlled by an intake valve 29.
The opening and closing of the combustion chamber 28 and the exhaust passage 30 is performed by an exhaust valve 31, and the intake valve 29 and the exhaust valve 31 are respectively opened and closed at a predetermined timing. Is provided with an engine temperature detector 32.
これらの吸気圧力検知器15、吸入空気温度検知器20、
スロットル位置検知器21、機関回転数検知器25、カムシ
ャフト位置検知器26及び機関温度検知器32で得られる運
転情報はコントロールユニット９の制御回路10に入力さ
れ、この運転情報に基づいて燃料ポンプ３、燃料噴射弁
８及び圧力調整弁６の制御が行なわれる。These intake pressure detector 15, intake air temperature detector 20,
Operation information obtained by the throttle position detector 21, the engine speed detector 25, the camshaft position detector 26, and the engine temperature detector 32 is input to the control circuit 10 of the control unit 9, and the fuel pump is operated based on the operation information. 3. Control of the fuel injection valve 8 and the pressure regulating valve 6 is performed.
従って、コントロールユニット９の制御回路10は、第
３図のメインスイッチが入力されると、駆動信号を出力
しポンプ駆動回路11を介して燃料ポンプ３を所定時間駆
動し、燃料通路２の圧力を所定値にして、内燃機関13の
作動時に燃料を適正な圧力にしている。Therefore, when the main switch of FIG. 3 is input, the control circuit 10 of the control unit 9 outputs a drive signal, drives the fuel pump 3 via the pump drive circuit 11 for a predetermined time, and reduces the pressure in the fuel passage 2. At a predetermined value, the fuel is kept at an appropriate pressure when the internal combustion engine 13 is operating.
そして、内燃機関13が起動され、例えばアイドリング
時等の低回転或いは低負荷には、第２図に示すような燃
料消費量の判別マップにより、燃料消費量が小領域Ａと
大領域Ｂの判断が行なわれ、燃料消費量が小領域Ａと判
断し、第３図に示すように断続的な駆動信号を出力す
る。このため、ポンプ駆動回路11によって燃料ポンプ３
の駆動電力が低下し、燃料ポンプ３の吐出能力が小さく
なって、燃料の圧力が低下した状態で燃料噴射弁８の作
動が行なわれる。Then, the internal combustion engine 13 is started, and for example, when the engine speed is low or the engine load is low during idling or the like, a fuel consumption determination map as shown in FIG. Is performed, the fuel consumption is determined to be in the small area A, and an intermittent drive signal is output as shown in FIG. Therefore, the fuel pump 3 is driven by the pump drive circuit 11.
Of the fuel pump 3 is reduced, the discharge capacity of the fuel pump 3 is reduced, and the fuel injection valve 8 is operated in a state where the fuel pressure is reduced.
一方、例えば内燃機関13の高回転或いは高負荷域で
は、第２図に示す燃料消費量の判別マップにより、燃料
消費量が大領域Ｂと判断して、第３図に示すように連続
的な駆動信号を出力する。このため、ポンプ駆動回路11
で燃料ポンプ３の駆動電力が増加し、燃料ポンプ３の吐
出能力が大きくなって、燃料の圧力が増加した状態で燃
料噴射弁８の作動が行なわれる。On the other hand, for example, in the high rotation or high load region of the internal combustion engine 13, the fuel consumption is determined to be in the large region B by the fuel consumption determination map shown in FIG. Output drive signal. Therefore, the pump drive circuit 11
As a result, the driving power of the fuel pump 3 increases, the discharge capacity of the fuel pump 3 increases, and the fuel injection valve 8 operates in a state where the fuel pressure increases.
［発明の効果］ 前記のように、請求項１記載の発明では、燃料ポンプ
への時間当たりの供給駆動電力を、低回転あるいは低負
荷域で小さく、高回転あるいは高負荷域で大きくし、圧
力調整弁が開となる時の設定開弁力を低回転あるいは低
負荷域で小さく、高回転あるいは高負荷域で大きく調整
するから、運転状態に対応したエンジンの要求する燃料
噴射量に対応して、燃料ポンプの吐出量を増減するの
で、燃料ポンプはむだにエネルギーを消費しない。ま
た、燃料ポンプそのものの吐出量を増減するので、より
広い運転状態において燃料ポンプはむだにエネルギーを
消費しない。さらに、燃料ポンプの下流側の燃料通路の
圧力が運転状態に対応して増減されるので、噴射圧の制
御による噴射量の増減が可能となり、燃料噴射弁の開期
間の制御による噴射量の増減に加えて噴射量のダイナミ
ックレンジを拡げることができ、その分燃料噴射弁の小
型化が可能となる。[Effects of the Invention] As described above, according to the first aspect of the present invention, the drive power supplied to the fuel pump per hour is reduced in a low rotation or low load region, and increased in a high rotation or high load region, and the pressure is increased. The set valve opening force when the regulating valve is opened is small at low rotation or low load range and large at high rotation or high load range. In addition, since the discharge amount of the fuel pump is increased or decreased, the fuel pump does not waste energy. In addition, since the discharge amount of the fuel pump itself is increased or decreased, the fuel pump does not waste energy in a wider operating state. Furthermore, since the pressure in the fuel passage downstream of the fuel pump is increased or decreased in accordance with the operating state, the injection amount can be increased or decreased by controlling the injection pressure, and the injection amount can be increased or decreased by controlling the opening period of the fuel injection valve. In addition to this, the dynamic range of the injection amount can be expanded, and the size of the fuel injection valve can be reduced accordingly.
請求項２記載の発明では、燃料通路の内前記燃料ポン
プの下流側の圧力と燃料が噴射される部位の近傍の圧力
との差に対応した開弁力が、設定開弁力より大なる時、
圧力調整弁を開とするから、噴射先の圧力をフィードバ
ックして噴射圧が決められ、噴射圧と噴射先の圧力差を
一定にして噴射することになり、噴射先に圧力変動があ
っても、安定した量の燃料を噴射可能となる。According to the second aspect of the present invention, when the valve opening force corresponding to the difference between the pressure on the downstream side of the fuel pump in the fuel passage and the pressure near the portion where fuel is injected is larger than the set valve opening force. ,
Since the pressure regulating valve is opened, the injection pressure is determined by feeding back the pressure of the injection destination, and the injection is performed with a constant difference between the injection pressure and the pressure of the injection destination. Thus, a stable amount of fuel can be injected.
第１図はこの発明が適用される内燃機関の燃料噴射装置
の概略図、第２図は燃料消費量の判別マップ、第３図は
燃料噴射装置の作動を示すタイミングチャートである。 図中符号１は燃料タンク、２は燃料通路、３は燃料ポン
プ、６は圧力調整弁、７は吸気通路、８は燃料噴射弁、
９はコントロールユニット、10は制御回路、11はポンプ
駆動回路である。FIG. 1 is a schematic diagram of a fuel injection device of an internal combustion engine to which the present invention is applied, FIG. 2 is a fuel consumption discrimination map, and FIG. 3 is a timing chart showing the operation of the fuel injection device. In the figure, reference numeral 1 denotes a fuel tank, 2 denotes a fuel passage, 3 denotes a fuel pump, 6 denotes a pressure regulating valve, 7 denotes an intake passage, 8 denotes a fuel injection valve,
9 is a control unit, 10 is a control circuit, and 11 is a pump drive circuit.
Claims (2)
路の途中に燃料ポンプを配置し、この燃料通路の内前記
燃料ポンプの下流側に、この下流側の圧力が高い時開弁
し、前記燃料ポンプの下流側の燃料を上流側に戻す圧力
調整弁を配置し、運転状態に対応した量の燃料を噴射す
る燃料噴射弁を前記燃料ポンプの下流側の前記燃料通路
に配置し、運転状態に対応して前記燃料噴射弁を駆動す
るための駆動信号のパルス幅を制御する燃料噴射弁駆動
回路を備えた内燃機関の燃料噴射装置において、前記燃
料ポンプへの時間当たりの供給駆動電力を、低回転ある
いは低負荷域で小さく、高回転あるいは高負荷域で大き
くし、前記圧力調整弁に、この圧力調整弁が開となる時
の設定開弁力を低回転あるいは低負荷域で小さく、高回
転あるいは高負荷域で大きく調整するアクチュエータを
設けたことを特徴とする内燃機関の燃料噴射装置。1. A fuel passage is provided in a fuel tank, a fuel pump is disposed in the middle of the fuel passage, and a valve is opened downstream of the fuel pump in the fuel passage when the pressure on the downstream side is high. A pressure regulating valve for returning fuel on the downstream side of the fuel pump to the upstream side is disposed, and a fuel injection valve for injecting an amount of fuel corresponding to an operation state is disposed in the fuel passage on the downstream side of the fuel pump. In a fuel injection device for an internal combustion engine including a fuel injection valve drive circuit that controls a pulse width of a drive signal for driving the fuel injection valve in accordance with a state, a supply driving power per time to the fuel pump is reduced. , Small in low rotation or low load region, large in high rotation or high load region, the pressure regulating valve, the set valve opening force when this pressure regulating valve is opened is small in low rotation or low load region, High rotation or high load In large it an adjustment actuator is provided a fuel injection system for an internal combustion engine characterized by.
燃料ポンプの下流側の圧力と燃料が噴射される部位の近
傍の圧力との差に対応した開弁力が、前記設定開弁力よ
り大なる時、前記圧力調整弁を開とするようにしたこと
を特徴とする内燃機関の燃料噴射装置。2. The set valve opening force according to claim 1, wherein a valve opening force corresponding to a difference between a pressure of the fuel passage downstream of the fuel pump and a pressure near a portion where fuel is injected is provided. The fuel injection device for an internal combustion engine, wherein the pressure regulating valve is opened when the pressure becomes larger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63297534A JP2747592B2 (en) | 1988-11-25 | 1988-11-25 | Fuel injection device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63297534A JP2747592B2 (en) | 1988-11-25 | 1988-11-25 | Fuel injection device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02146253A JPH02146253A (en) | 1990-06-05 |
| JP2747592B2 true JP2747592B2 (en) | 1998-05-06 |
Family
ID=17847781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63297534A Expired - Fee Related JP2747592B2 (en) | 1988-11-25 | 1988-11-25 | Fuel injection device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2747592B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5265644A (en) * | 1992-06-02 | 1993-11-30 | Walbro Corporation | Fuel pressure regulator |
| JPH074332A (en) * | 1993-06-18 | 1995-01-10 | Yamaha Motor Co Ltd | High pressure fuel pump for internal combustion engine |
| CN1788153B (en) * | 2004-03-01 | 2010-12-22 | 雅马哈发动机株式会社 | Fuel pump control device and fuel pump control method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59120776A (en) * | 1982-12-27 | 1984-07-12 | Honda Motor Co Ltd | Fuel feed quantity control device of internal-combustion engine |
| JPS6365166A (en) * | 1986-09-08 | 1988-03-23 | Japan Electronic Control Syst Co Ltd | Fuel pump controller for internal combustion engine |
-
1988
- 1988-11-25 JP JP63297534A patent/JP2747592B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02146253A (en) | 1990-06-05 |
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