JP2017089568A - Fuel injection device - Google Patents

Fuel injection device Download PDF

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Publication number
JP2017089568A
JP2017089568A JP2015223044A JP2015223044A JP2017089568A JP 2017089568 A JP2017089568 A JP 2017089568A JP 2015223044 A JP2015223044 A JP 2015223044A JP 2015223044 A JP2015223044 A JP 2015223044A JP 2017089568 A JP2017089568 A JP 2017089568A
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Japan
Prior art keywords
fuel injection
fuel
injection hole
chamber space
spark plug
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Pending
Application number
JP2015223044A
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Japanese (ja)
Inventor
渡辺 聖彦
Masahiko Watanabe
聖彦 渡辺
翔大 戸田
Shota Toda
翔大 戸田
篤史 本田
Atsushi Honda
篤史 本田
泰 野口
Yasushi Noguchi
泰 野口
達郎 清原
Tatsuro Kiyohara
達郎 清原
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Toyota Motor Corp
Soken Inc
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Nippon Soken Inc
Toyota Motor Corp
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Application filed by Nippon Soken Inc, Toyota Motor Corp filed Critical Nippon Soken Inc
Priority to JP2015223044A priority Critical patent/JP2017089568A/en
Publication of JP2017089568A publication Critical patent/JP2017089568A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection device capable of effectively atomizing fuel injected into a cylinder chamber of an internal combustion engine by a spark plug.SOLUTION: A fuel injection device includes a chamber space into which a fuel is introduced, and a fuel injection hole configured to inject fuel from the chamber space. In the fuel injection device, into the fuel injection hole assembled is a valve body including a shaft part penetrating the fuel injection hole, a valve dish part connected to one end of the shaft part and opening/closing the fuel injection hole from an outlet side, and a pressure reception part provided in the chamber space and connected to the other end of the shaft part; the valve body is energized to a position of closing the fuel injection hole at the valve dish part by a spring; and at a position opposite to the pressure reception part provided is a spark plug configured to apply a spark to fuel in the chamber space.SELECTED DRAWING: Figure 1

Description

本発明は、内燃機関のシリンダ室内に燃料を噴射する燃料噴射装置に係る。   The present invention relates to a fuel injection device that injects fuel into a cylinder chamber of an internal combustion engine.

内燃機関のシリンダ室内に噴射される燃料を微粒化すべく、燃料噴射孔より噴射された燃料にスパークプラグの火花により生じた荷電粒子にアンテナより電磁波を照射したものを噴き付ける構造が、下記の特許文献1に於いて提案されている。   In order to atomize the fuel injected into the cylinder chamber of the internal combustion engine, a structure in which charged particles generated by the spark of the spark plug are injected into the fuel injected from the fuel injection hole by electromagnetic waves from the antenna is disclosed in the following patent It is proposed in Document 1.

特開2014-62551号公報JP 2014-62551 A

本発明は、内燃機関のシリンダ室内に噴射される燃料をスパークプラグにより微粒化することをより効果的に達成する燃料噴射装置を提供することを課題としている。   It is an object of the present invention to provide a fuel injection device that more effectively achieves atomization of fuel injected into a cylinder chamber of an internal combustion engine by a spark plug.

上記の課題を解決すべく、本発明は、燃料が導入される室空間と、該室空間より燃料を噴出する燃料噴射孔とを備えた燃料噴射装置にして、前記燃料噴射孔にはそれを貫通する軸部と前記軸部の一端に連結されて前記燃料噴射孔を出口側から開閉する弁皿部と前記室空間内にあって前記軸部の他端に連結された受圧部とを有する弁体が組み付けられ、前記弁体は前記弁皿部にて前記燃料噴射孔を閉じる位置へばねにより付勢されており、前記受圧部に対向する位置にて前記室空間内の燃料に火花を付加するスパークプラグ、および前記スパークプラグに通電して火花を発生させる電源装置が設けられていることを特徴とする燃料噴射装置を提案するものである。   In order to solve the above problems, the present invention provides a fuel injection device comprising a chamber space into which fuel is introduced and a fuel injection hole for ejecting fuel from the chamber space. A shaft portion that penetrates, a valve plate portion that is connected to one end of the shaft portion to open and close the fuel injection hole from the outlet side, and a pressure receiving portion that is in the chamber space and is connected to the other end of the shaft portion. A valve body is assembled, and the valve body is biased by a spring to a position where the fuel injection hole is closed in the valve plate portion, and sparks are generated in the fuel in the chamber space at a position facing the pressure receiving portion. The present invention proposes a fuel injection device provided with a spark plug to be added and a power supply device for generating a spark by energizing the spark plug.

上記の如く、燃料が導入される室空間と、該室空間より燃料を噴出する燃料噴射孔とを備えた燃料噴射装置に於いて、前記燃料噴射孔にはそれを貫通する軸部と前記軸部の一端に連結されて前記燃料噴射孔を出口側から開閉する弁皿部と前記室空間内にあって前記軸部の他端に連結された受圧部とを有する弁体が組み付けられ、前記弁体は前記弁皿部にて前記燃料噴射孔を閉じる位置へばねにより付勢されており、前記受圧部に対向する位置にて前記室空間内の燃料に火花を付加するスパークプラグ、および前記スパークプラグに通電して火花を発生させる電源装置が設けられていれば、適時の通電により前記スパークプラグにて火花を発生させ、該火花により生じた圧力波を前記受圧部に作用させて前記弁体を開弁方向へ駆動し、前記燃料噴射孔より燃料を高圧にて噴出させることにより、噴射された燃料を効果的に微粒化することができる。またかかる構造によれば、スパークプラグに負荷する電気エネルギの大きさを変えることにより前記室空間内の燃料に加わる加圧度および前記受圧部に作用する圧力波の強さを変えることができ、前記電源装置の制御により、燃料噴射のタイミングだけでなく、燃料の噴射量および微粒化度合を制御することができる。   As described above, in a fuel injection device including a chamber space into which fuel is introduced and a fuel injection hole for ejecting fuel from the chamber space, the fuel injection hole has a shaft portion passing through the shaft portion and the shaft. A valve body having a valve plate portion connected to one end of the portion to open and close the fuel injection hole from the outlet side and a pressure receiving portion in the chamber space and connected to the other end of the shaft portion is assembled, The valve body is biased by a spring to a position that closes the fuel injection hole in the valve plate portion, and a spark plug that adds a spark to the fuel in the chamber space at a position facing the pressure receiving portion, and If a power supply device for generating a spark by energizing the spark plug is provided, a spark is generated by the spark plug by timely energization, and a pressure wave generated by the spark is applied to the pressure receiving portion to cause the valve Driving the body in the valve opening direction, the fuel By jetting at high pressure from the fuel Iana, it can be effectively atomized injected fuel. According to such a structure, the degree of pressurization applied to the fuel in the chamber space and the intensity of the pressure wave acting on the pressure receiving portion can be changed by changing the magnitude of the electric energy loaded on the spark plug. By controlling the power supply device, not only the fuel injection timing but also the fuel injection amount and the degree of atomization can be controlled.

本発明による燃料噴射装置をそれに燃料を供給する燃料供給源と共に一つの実施例について示す概略図である。1 is a schematic diagram illustrating one embodiment of a fuel injection device according to the present invention together with a fuel supply source for supplying fuel thereto. 図1に示す燃料噴射装置の要部を燃料噴射状態に於いて示す概略図である。It is the schematic which shows the principal part of the fuel-injection apparatus shown in FIG. 1 in a fuel-injection state.

図1に示す燃料噴射装置に於いては、燃料が導入される室空間10と、該室空間より燃料を噴出する燃料噴射孔12とは、箱体14により提供されている。燃料噴射孔12には、それを貫通する軸部16と、該軸部の一端に連結されて燃料噴射孔12を出口側から開閉する弁皿部18と、室空間10内にあって軸部16の他端に連結された受圧部20とを有する弁体22が組み付けられ、弁体22は弁皿部18にて燃料噴射孔12を閉じる位置へばね24により付勢されている。図示の実施例では、燃料噴射孔12は上流側から下流側へ向けて拡径したテーパ状の孔とされており、これに対応して弁皿部18は軸部16との連結部より外周縁へ向けて拡径した円錐体とされている。   In the fuel injection device shown in FIG. 1, a chamber space 10 into which fuel is introduced and a fuel injection hole 12 through which fuel is injected from the chamber space are provided by a box body 14. The fuel injection hole 12 includes a shaft portion 16 penetrating the fuel injection hole 12, a valve plate portion 18 connected to one end of the shaft portion for opening and closing the fuel injection hole 12 from the outlet side, and a shaft portion in the chamber space 10. A valve body 22 having a pressure receiving portion 20 connected to the other end of 16 is assembled, and the valve body 22 is urged by a spring 24 to a position where the fuel injection hole 12 is closed by a valve plate portion 18. In the illustrated embodiment, the fuel injection hole 12 is a tapered hole whose diameter is increased from the upstream side to the downstream side, and the valve plate portion 18 correspondingly corresponds to the outside of the connecting portion with the shaft portion 16. The cone is expanded toward the periphery.

室空間10には、燃料タンク26より燃料ポンプ28および燃料供給導管30を経て燃料が供給され、燃料が充たされる。また室空間10より余剰の燃料が燃料戻り導管32を経て燃料タンク26へ戻され、その途中に設けられた圧力制御弁33により燃圧が制御されるようになっている。   Fuel is supplied to the chamber space 10 from the fuel tank 26 via the fuel pump 28 and the fuel supply conduit 30 and is filled with fuel. Further, surplus fuel is returned from the chamber space 10 to the fuel tank 26 through the fuel return conduit 32, and the fuel pressure is controlled by the pressure control valve 33 provided in the middle thereof.

箱体14には、受圧部20に対向する位置にて室空間10内の燃料に火花を付加するスパークプラグ34が設けられており、電源装置36より制御された電圧および電流による電気が適時に供給されるようになっている。   The box body 14 is provided with a spark plug 34 for adding a spark to the fuel in the chamber space 10 at a position facing the pressure receiving unit 20. It comes to be supplied.

電源装置36は、点火ユニット38とエネルギユニット40とを含んでいる。点火ユニット38は、点火トリガ装置42を備え、点火トリガ装置42は図には示されていない制御装置から送られてくる点火信号に基づいて出力端子44にプラスの放電電圧を発生し、この放電電圧が第一のダイオード46を経てスパークプラグ34に印加され、これに放電を起こさせるようになっている。一方、エネルギユニット40では、コンデンサ48が電源装置50により常時チャージされるようになっている。コンデンサ48の接地側に対向する端子は、第二のダイオード52を経てスパークプラグ34に接続されているが、電源装置50によるコンデンサ48のチャージは、それ単独ではスパークプラグ34を放電させることはできない設定とされている。しかし、点火トリガ装置42の起動によりスパークプラグ34の放電が開始されると、コンデンサ48のチャージは点火トリガ装置42からの放電電流に上乗せされる形にてスパークプラグ34にて放電され、放電の火花が強められる。   The power supply device 36 includes an ignition unit 38 and an energy unit 40. The ignition unit 38 includes an ignition trigger device 42. The ignition trigger device 42 generates a positive discharge voltage at the output terminal 44 on the basis of an ignition signal sent from a control device (not shown). A voltage is applied to the spark plug 34 via the first diode 46 to cause discharge. On the other hand, in the energy unit 40, the capacitor 48 is always charged by the power supply device 50. The terminal facing the ground side of the capacitor 48 is connected to the spark plug 34 via the second diode 52. However, the charging of the capacitor 48 by the power supply device 50 cannot discharge the spark plug 34 by itself. It is set. However, when the discharge of the spark plug 34 is started by the activation of the ignition trigger device 42, the charge of the capacitor 48 is discharged by the spark plug 34 in a form added to the discharge current from the ignition trigger device 42. Sparks are strengthened.

図2に解図的に示す如く、スパークプラグ34が通電により火花を発生させると、該火花により生じた圧力波54が受圧部20に作用し、弁体22は開弁方向へ駆動されるので、室空間10内の燃料は加圧されると同時に燃料噴射孔12より噴出し、燃料噴射孔12を通る加圧噴射により微粒化される。この場合、燃料噴射のタイミングは勿論スパークプラグ34への電気エネルギの負荷のタイミングによって制御されるが、更にスパークプラグへ負荷する電気エネルギの大きさを変えることにより室空間10内の燃料に加わる加圧度および受圧部20に作用する圧力波の強さを変えることができ、電源装置36に於いてスパークプラグへ負荷する電気の電圧および電流を制御することにより、燃料の噴射量および微粒化度合を制御することができる。   As shown schematically in FIG. 2, when the spark plug 34 generates a spark by energization, the pressure wave 54 generated by the spark acts on the pressure receiving portion 20 and the valve element 22 is driven in the valve opening direction. The fuel in the chamber space 10 is pressurized and ejected from the fuel injection hole 12 and atomized by the pressure injection through the fuel injection hole 12. In this case, the timing of fuel injection is of course controlled by the timing of the electric energy load applied to the spark plug 34, but further, the amount of electric energy applied to the spark plug is changed to add to the fuel in the chamber space 10. The pressure and the intensity of the pressure wave acting on the pressure receiving unit 20 can be changed, and by controlling the electric voltage and current applied to the spark plug in the power supply device 36, the fuel injection amount and the degree of atomization are controlled. Can be controlled.

以上に於いては本発明を一つの実施例について詳細に説明したが、かかる実施例について本発明の範囲内にて種々の変更が可能であることは当業者にとって明らかであろう。   While the invention has been described in detail with reference to an embodiment thereof, it will be apparent to those skilled in the art that various modifications can be made to the embodiment without departing from the scope of the invention.

10…室空間、12…燃料噴射孔、14…箱体、16…軸部、18…弁皿部、20…受圧部、22…弁体、24…ばね、26…燃料タンク、28…燃料ポンプ、30…燃料供給導管、32…燃料戻り導管、33…圧力制御弁、34…スパークプラグ、36…電源装置、38…点火ユニット、40…エネルギユニット、42…点火トリガ装置、44…出力端子、46…ダイオード、48…コンデンサ、50…電源装置、52…ダイオード、54…圧力波   DESCRIPTION OF SYMBOLS 10 ... Chamber space, 12 ... Fuel injection hole, 14 ... Box body, 16 ... Shaft part, 18 ... Valve plate part, 20 ... Pressure-receiving part, 22 ... Valve body, 24 ... Spring, 26 ... Fuel tank, 28 ... Fuel pump 30 ... Fuel supply conduit, 32 ... Fuel return conduit, 33 ... Pressure control valve, 34 ... Spark plug, 36 ... Power supply, 38 ... Ignition unit, 40 ... Energy unit, 42 ... Ignition trigger device, 44 ... Output terminal, 46 ... Diode, 48 ... Capacitor, 50 ... Power supply, 52 ... Diode, 54 ... Pressure wave

Claims (1)

燃料が導入される室空間と、該室空間より燃料を噴出する燃料噴射孔とを備えた燃料噴射装置にして、前記燃料噴射孔にはそれを貫通する軸部と前記軸部の一端に連結されて前記燃料噴射孔を出口側から開閉する弁皿部と前記室空間内にあって前記軸部の他端に連結された受圧部とを有する弁体が組み付けられ、前記弁体は前記弁皿部にて前記燃料噴射孔を閉じる位置へばねにより付勢されており、前記受圧部に対向する位置にて前記室空間内の燃料に火花を付加するスパークプラグ、および前記スパークプラグに通電して火花を発生させる電源装置が設けられていることを特徴とする燃料噴射装置。   A fuel injection device having a chamber space into which fuel is introduced and a fuel injection hole for ejecting fuel from the chamber space. The fuel injection hole is connected to a shaft portion passing through the fuel injection hole and one end of the shaft portion. And a valve body having a valve plate portion that opens and closes the fuel injection hole from the outlet side and a pressure receiving portion that is in the chamber space and is connected to the other end of the shaft portion is assembled. A spring is biased by a spring to a position where the fuel injection hole is closed at the plate portion, and a spark plug for adding sparks to the fuel in the chamber space at a position facing the pressure receiving portion, and the spark plug are energized. A fuel injection device comprising a power supply device for generating sparks.
JP2015223044A 2015-11-13 2015-11-13 Fuel injection device Pending JP2017089568A (en)

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