JP2600870B2 - Pressure relief fuel injection valve safety valve - Google Patents
Pressure relief fuel injection valve safety valveInfo
- Publication number
- JP2600870B2 JP2600870B2 JP63317363A JP31736388A JP2600870B2 JP 2600870 B2 JP2600870 B2 JP 2600870B2 JP 63317363 A JP63317363 A JP 63317363A JP 31736388 A JP31736388 A JP 31736388A JP 2600870 B2 JP2600870 B2 JP 2600870B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- valve
- fuel
- passage
- valve seat
- 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 - Lifetime
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- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は蓄圧式燃料噴射装置の一部に組み込まれ、
蓄圧式燃料噴射装置の圧力制御時に燃料圧力が異常に上
昇した時に燃料をリークさせて高圧ポンプ等の破損を防
止する安全弁に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is incorporated in a part of a pressure accumulating fuel injection device,
The present invention relates to a safety valve that leaks fuel when a fuel pressure rises abnormally during pressure control of a pressure accumulating fuel injection device, thereby preventing damage to a high-pressure pump or the like.
［従来技術］ 蓄圧式燃料噴射装置においてはその一構成要素である
高圧ポンプに使用されている電磁弁が制御不能になると
燃料圧力が異常に上昇にする可能性がある。この燃料圧
力の異常な上昇を防止する方法として安全弁の使用が考
えられる。安全弁として現在特に開示されたものはない
が例えば第５図の安全弁30のように電磁弁31と圧力セン
サ32とを使用し、蓄圧室３の燃料圧力が異常に上昇した
時に圧力センサ32の信号により電磁弁31か作動して弁子
33が開弁し、燃料を矢印方向にリークさせるもの。第６
図の安全弁46のように蓄圧室３に連通する燃料通路41に
薄膜42を設け、蓄圧室３の燃料圧力が設定値異常になる
と薄膜42が破れて燃料を矢印方向にリークさせるもの。
更に第７図（イ）の安全弁50のように弁子51を弁座52に
ばね53で押し付け、蓄圧室３の圧力がばね53による設定
値以上になると矢印方向に燃料をリークさせるものがあ
る。[Related Art] In an accumulator type fuel injection device, when an electromagnetic valve used in a high-pressure pump, which is one component thereof, becomes uncontrollable, there is a possibility that the fuel pressure may rise abnormally. As a method for preventing the abnormal increase in the fuel pressure, use of a safety valve can be considered. Although there is no particular disclosure of a safety valve at present, an electromagnetic valve 31 and a pressure sensor 32 are used as in a safety valve 30 in FIG. 5, for example, and a signal from the pressure sensor 32 when the fuel pressure in the accumulator chamber 3 rises abnormally. The solenoid valve 31 is actuated by
33 opens the valve and leaks fuel in the direction of the arrow. Sixth
Like the safety valve 46 in the figure, a thin film 42 is provided in a fuel passage 41 communicating with the accumulator 3, and when the fuel pressure in the accumulator 3 becomes abnormal at a set value, the thin film 42 is broken and fuel leaks in the direction of the arrow.
7 (a), the valve element 51 is pressed against the valve seat 52 by a spring 53, and when the pressure in the pressure accumulating chamber 3 exceeds the set value by the spring 53, the fuel leaks in the direction of the arrow. .
［発明が解決しようとする課題］ 然し第５図のものは高価であり、電磁弁の信頼性に問
題があり、第６図のものは真実の圧力上昇でなく、一時
的に圧力が上昇しても薄膜42が破れて２度の使用が不可
能となる。又第７図（イ）の安全弁50はその開弁圧を高
圧ポンプの耐圧上限付近に設定すると開弁後の圧力の降
下とともに閉弁して第７図（ロ）のように耐圧上限付近
の圧力を維持する。このためリンプホームのための適当
な圧力を得ることが困難になる。逆に開弁圧をリンプホ
ームを考慮して低めに設定すると圧力制御時に通常の圧
力で開弁して了い、高圧が得られなくなる。[Problems to be Solved by the Invention] However, the one in FIG. 5 is expensive and has a problem in the reliability of the solenoid valve, and the one in FIG. 6 is not a true pressure increase but a temporary pressure increase. Even if the thin film 42 is broken, it cannot be used twice. When the opening pressure of the safety valve 50 in FIG. 7 (a) is set near the upper limit of the pressure resistance of the high-pressure pump, the valve closes as the pressure drops after opening and closes as shown in FIG. 7 (b). Maintain pressure. This makes it difficult to obtain adequate pressure for the limp home. Conversely, if the valve opening pressure is set lower in consideration of the limp home, the valve is opened at the normal pressure during pressure control, and a high pressure cannot be obtained.
この発明は蓄圧式燃料噴射装置において燃料圧力が一
時的に上昇した時には一時的に開弁して燃料をリークさ
せ、燃料圧力制御機構の異常により燃料圧力が長期的に
上昇するような場合には常開して燃料圧力の異常な上昇
を防止するとともにリンプホームに必要なような圧力を
確保する安全弁の提供を課題とする。The present invention relates to a pressure accumulating type fuel injection device, in which the valve is opened temporarily when the fuel pressure temporarily rises to leak fuel, and when the fuel pressure rises for a long time due to abnormality of the fuel pressure control mechanism. An object of the present invention is to provide a safety valve that is normally opened to prevent an abnormal rise in fuel pressure and to secure a pressure necessary for a limp home.
［課題を解決するための技術的手段］ 上記の課題を解決するためこの発明は、高圧ポンプか
ら供給された高圧燃料を蓄積する蓄圧室と、前記高圧ポ
ンプを制御して前記蓄圧室に蓄積された高圧燃料の圧力
を制御する制御手段とを備え、この蓄圧室に蓄積された
高圧燃料を噴射して車両を駆動する蓄圧式燃料噴射装置
の安全弁であって、前記蓄圧室より弁座に連通する燃料
通路と、前記燃料通路の前記弁座が位置する部位より連
通するリーク通路と、前記燃料通路を介して伝わる前記
蓄圧室内の燃料圧力が設定値以上になった時に前記弁座
より離れて弁座を開き、前記リーク通路から燃料をリー
クさせる弁子とを備え、前記リーク通路には、前記弁座
が開かれている状態で前記高圧ポンプが燃料の全量を噴
射している状態において車両のリンプホームが可能とな
る量の燃料が噴射されるとともに、前記弁座が開かれて
いる状態で前記弁子と前記弁座間の流路面積より小さく
なるように流路面積が設定されている絞りが備えられて
いる。[Technical Means for Solving the Problems] In order to solve the above problems, the present invention provides a pressure accumulation chamber for accumulating high pressure fuel supplied from a high pressure pump, and a pressure accumulation chamber for controlling the high pressure pump to accumulate in the pressure accumulation chamber. Control means for controlling the pressure of the high-pressure fuel, the safety valve of a pressure-accumulation fuel injection device that drives the vehicle by injecting the high-pressure fuel stored in the pressure-accumulation chamber, wherein the safety valve communicates with the valve seat from the pressure-accumulation chamber. A fuel passage, a leak passage communicating from a portion of the fuel passage where the valve seat is located, and a distance from the valve seat when the fuel pressure in the accumulator transmitted through the fuel passage becomes equal to or higher than a set value. A valve for opening a valve seat and allowing fuel to leak from the leak passage, wherein the high-pressure pump injects the entire amount of fuel into the leak passage while the valve seat is open. Limp A throttle in which the flow area is set so that the amount of fuel that allows home is injected and the flow path area between the valve element and the valve seat is smaller in a state where the valve seat is opened is opened. Provided.
前記弁子の開弁を検知する検知手段を備えており、該
検知手段が前記弁子が開弁されていることを検知したと
き、前記制御手段は前記蓄圧室に供給される高圧燃料の
圧力を低下させてもよい。Detecting means for detecting the opening of the valve element, and when the detecting means detects that the valve element is opened, the control means controls the pressure of the high-pressure fuel supplied to the pressure accumulating chamber. May be reduced.
［作用］ 例えば高圧ポンプに使用されている高圧力設定用のス
プリングの折損により制御手段が完全に異常になり蓄圧
室の圧力が上昇しても、蓄圧室の圧力が弁子の設定開弁
圧力より高くなった時点で弁子が開弁する。高圧ポンプ
は燃料圧力を下げることなく作動しつづけてもリーク通
路の圧力は絞りのため弁子の開弁圧以下に降下せず弁子
は開弁したままであり、蓄圧室の圧力は上昇しつづけな
い。一方、絞りの面積はリンプホームが可能となる面積
に設定されているので制御手段が完全に異常になっても
リンプホームは可能である。[Operation] Even if the control means becomes completely abnormal due to breakage of a spring for setting a high pressure used in a high-pressure pump, for example, and the pressure in the accumulator rises, the pressure in the accumulator remains at the set valve opening pressure of the valve. The valve opens when it becomes higher. Even if the high-pressure pump continues to operate without lowering the fuel pressure, the pressure in the leak passage does not drop below the valve opening pressure of the valve due to the restriction, the valve remains open, and the pressure in the accumulator rises. I will not continue. On the other hand, since the area of the aperture is set to an area where limp home is possible, limp home can be performed even if the control means becomes completely abnormal.
また弁子の開弁を検知する検知手段が備えられている
と、制御手段が、例えばノイズによるエラー信号により
一時的に異常となり、蓄圧室の圧力が弁子の設定開弁圧
力より高くなっても、弁子が弁座から離れて開弁されて
燃料が蓄圧室から安全弁のリーク通路に流されるのと同
時に警告信号が制御手段に伝達される。この警告信号に
より、制御手段は高圧ポンプに圧力を下げさせる指示を
出すので高圧ポンプの吐出量は減少し、蓄圧室の圧力は
減少する。このため弁子に作用する圧力は開弁圧力以下
となり、弁子は弁座に着座し燃料噴射装置は正常運転に
戻る。If the detection means for detecting the opening of the valve element is provided, the control means temporarily becomes abnormal due to, for example, an error signal due to noise, and the pressure in the accumulator becomes higher than the set valve opening pressure of the valve element. Also, the warning signal is transmitted to the control means at the same time as the valve is opened apart from the valve seat and fuel flows from the accumulator into the leak passage of the safety valve. In response to this warning signal, the control means issues an instruction to lower the pressure of the high-pressure pump, so that the discharge amount of the high-pressure pump decreases and the pressure of the accumulator decreases. For this reason, the pressure acting on the valve element becomes lower than the valve opening pressure, the valve element is seated on the valve seat, and the fuel injection device returns to the normal operation.
［実施例］ 以下実施例を示す第１、２図によりこの発明を説明す
る。まづ第２図により蓄圧式燃料噴射装置の全体を説明
すると、蓄圧式燃料噴射装置１は高圧ポンプ２、蓄圧室
３、インジェクタ４、制御ユニット（ECU）５、電気駆
動ユニット（EDU）６、低圧ポンプ７とから構成されて
いる。本発明の安全弁10は蓄圧室３に接続されている。EXAMPLES The present invention will be described below with reference to FIGS. First, referring to FIG. 2, the entirety of the pressure-accumulation fuel injection device will be described. The pressure-accumulation fuel injection device 1 includes a high-pressure pump 2, a pressure accumulation chamber 3, an injector 4, a control unit (ECU) 5, an electric drive unit (EDU) 6, And a low-pressure pump 7. The safety valve 10 of the present invention is connected to the accumulator 3.
高圧ポンプ３は圧力制御用電磁弁2aを有し、燃料タン
ク８から低圧ポンプ７を介して吸入した燃料を圧力制御
用電磁弁2aの作用の下に一定圧力に高めて蓄圧室３に送
給する。蓄圧室３はディーゼルエンジンのインジェクタ
４に連結されている。4aはインジェクタ４の燃料噴射制
御用電磁弁である。制御ユニット５はCPU5a、ROM5b、RA
M5c、入出力部5dから構成され、蓄圧室３から圧力を、
さらには図示しないエンジンから水温などの必要なデー
タを入力し、電気駆動ユニット６を介して高圧ポンプ２
の電磁弁2aに圧力制御信号を、又インジェクタ４の電磁
弁4aに開閉信号を出す。電気駆動ユニット６は制御ユニ
ット５の出力を高める機能を有する。なお、前記の燃料
圧力制御機構はECU5及び高圧ポンプ２の圧力制御用電磁
弁2aを含めたものの総称である。The high-pressure pump 3 has a pressure control solenoid valve 2a. The fuel sucked from the fuel tank 8 via the low-pressure pump 7 is increased to a constant pressure under the action of the pressure control solenoid valve 2a and is supplied to the pressure accumulation chamber 3. I do. The accumulator 3 is connected to an injector 4 of a diesel engine. Reference numeral 4a denotes a fuel injection control solenoid valve of the injector 4. The control unit 5 has a CPU 5a, ROM 5b, RA
M5c and an input / output unit 5d.
Further, necessary data such as water temperature is input from an engine (not shown), and the high-pressure pump 2
A pressure control signal to the solenoid valve 2a, and an open / close signal to the solenoid valve 4a of the injector 4. The electric drive unit 6 has a function of increasing the output of the control unit 5. The above-described fuel pressure control mechanism is a generic term for the ECU 5 and the pressure control solenoid valve 2a of the high-pressure pump 2.
次に本発明の安全弁10に就いて説明する。安全弁10は
筒状のバルブボデー11を有し、その内部に同心の大径の
スプリング孔11a、中径のバルブ孔11b、小径の燃料通路
11c及びバルブ孔11bと燃料通路11cとに直角方向のリー
ク通路11dを有している。リーク通路11dと燃料通路11c
との交差部は弁座16となっている。燃料通路11cは蓄圧
室３に連通しいる。バルブ孔11b内には円柱部12aと円錘
部12bとからなる弁子12の円柱部12aが摺動可能に収容さ
れている。又円錘部12bは弁子12の移動にともない弁座1
6に接離可能となっている。弁子12はスプリング孔11a内
に設けたスプリング13により弁座16の方向に付勢され、
常に弁座16に押し付けられている。この時の弁子12の蓄
圧室３に対する受圧面積はＢである。スプリング３の付
勢力は受圧面積Ｂに所定の圧力が作用した時発生する押
力に設定されている。所定の圧力とは本蓄圧システム
（第２図１）の耐圧限界よりやや小さい圧力である。弁
子12の円柱部12aの端面には当接部18が取り付けられ、
この当接部18と距離Ｌを隔ててセンサ15が設けられ、EC
U5に接続されている。リーク通路11dには絞り17が設け
られており、弁座16を通った燃料は絞り17により一度絞
られてからリーク通路11dを流れ、リーク燃料として回
収される。弁子12の円柱部12aとバルブ孔11bとのクリア
ランスは１〜５μｍ程度であるので燃料はリーク通路11
dからスプリングア孔11aにほとんど侵入しない。このた
め弁座16と絞り17とバルブ孔11bとにより圧力室14が形
成される。絞り17の流路面積Ｃは蓄圧室３に燃料を供給
している高圧ポンプ２が燃料の全量を噴射している状態
の時、蓄圧室３の圧力がリンプホーム圧力Ｐとなるよう
に高圧ポンプ２の容量に応じて設定されている。又弁子
12の円柱部12aの面積Ａは弁子２がリンプホーム圧力Ｐ
よりやや低い圧力で閉弁するように設定されている。従
って蓄圧室３の圧力が一旦弁子12の設定開弁圧力以上と
なり、弁子12が開弁すると高圧ポンプ２が燃料の全量を
噴射している状態では圧力室14の圧力は絞り17のため閉
弁圧力以下に下らず、弁子12は開き放しになる。ただし
このときは弁子12と弁座16との間に形成される流路面積
Ｄは絞り17の流路面積Ｃより大きくなるように設定され
ていなければならない。なお、19はスプリング孔11aに
連通するは通気孔である。Next, the safety valve 10 of the present invention will be described. The safety valve 10 has a cylindrical valve body 11, in which a large-diameter spring hole 11a, a medium-diameter valve hole 11b, and a small-diameter fuel passage are concentric.
There is a leak passage 11d in a direction perpendicular to the fuel passage 11c and the valve hole 11b and the fuel passage 11c. Leak passage 11d and fuel passage 11c
The intersection with is a valve seat 16. The fuel passage 11c communicates with the accumulator 3. A cylindrical portion 12a of the valve element 12 including a cylindrical portion 12a and a conical portion 12b is slidably accommodated in the valve hole 11b. In addition, the cone portion 12b moves the valve seat 1
6 can be separated. The valve element 12 is urged in the direction of the valve seat 16 by a spring 13 provided in the spring hole 11a,
It is always pressed against the valve seat 16. The pressure receiving area of the valve 12 with respect to the pressure accumulating chamber 3 at this time is B. The urging force of the spring 3 is set to a pressing force generated when a predetermined pressure acts on the pressure receiving area B. The predetermined pressure is a pressure slightly smaller than the pressure resistance limit of the present pressure accumulation system (FIG. 2). A contact portion 18 is attached to the end face of the cylindrical portion 12a of the valve 12,
The sensor 15 is provided at a distance L from the contact portion 18,
Connected to U5. A throttle 17 is provided in the leak passage 11d, and the fuel that has passed through the valve seat 16 is once throttled by the throttle 17 and then flows through the leak passage 11d to be collected as leak fuel. Since the clearance between the cylindrical portion 12a of the valve 12 and the valve hole 11b is about 1 to 5 μm, the fuel flows through the leak passage 11.
It hardly penetrates into the spring hole 11a from d. Therefore, the pressure chamber 14 is formed by the valve seat 16, the throttle 17, and the valve hole 11b. The flow path area C of the throttle 17 is such that when the high-pressure pump 2 that supplies fuel to the pressure accumulating chamber 3 is injecting the entire amount of fuel, the pressure in the pressure accumulating chamber 3 becomes the limp home pressure P. 2 is set according to the capacity. Again
The area A of the 12 cylindrical portions 12a is such that the valve 2 has a limp home pressure P
The valve is set to close at a slightly lower pressure. Therefore, once the pressure in the pressure accumulating chamber 3 becomes equal to or higher than the set valve opening pressure of the valve 12 and the valve 12 is opened, the pressure in the pressure chamber 14 is reduced by the throttle 17 when the high-pressure pump 2 is injecting the entire amount of fuel. The valve 12 does not fall below the valve closing pressure and the valve 12 is left open. However, at this time, the flow path area D formed between the valve element 12 and the valve seat 16 must be set to be larger than the flow path area C of the throttle 17. Reference numeral 19 denotes a ventilation hole communicating with the spring hole 11a.
上記の構成において、燃料圧力制御機構が、例えばノ
イズによるエラー信号により一時的に異常となり、蓄圧
室３の圧力が弁子12の設定開弁圧力より高くなると弁子
12は弁座16から離れて開弁し、当接部18がセンサ15に当
接する。この結果蓄圧室３の燃料はリーク通路11dに流
れ、又センサ15から警告信号が燃料圧力制御機構に伝達
される。この警告信号により、燃料圧力制御機構は高圧
ポンプ２に圧力を下げさせる指示を出すので高圧ポンプ
２の吐出量は減少する。このため圧力室14の圧力は弁子
12の閉弁圧力以下となり、弁子12は弁座16に着座し燃料
噴射装置は正常運転に戻る。第４図（イ）はこの場合の
圧力、警告信号の発信時期及び安全弁10の動作を示す。In the above configuration, when the fuel pressure control mechanism temporarily becomes abnormal due to, for example, an error signal due to noise, and the pressure in the pressure accumulating chamber 3 becomes higher than the set valve opening pressure of the valve 12, the valve
The valve 12 is opened apart from the valve seat 16, and the contact portion 18 contacts the sensor 15. As a result, the fuel in the accumulator 3 flows into the leak passage 11d, and a warning signal is transmitted from the sensor 15 to the fuel pressure control mechanism. In response to this warning signal, the fuel pressure control mechanism issues an instruction to lower the pressure of the high-pressure pump 2, so that the discharge amount of the high-pressure pump 2 decreases. Therefore, the pressure in the pressure chamber 14 is
When the valve closing pressure becomes equal to or less than the valve closing pressure of 12, the valve element 12 is seated on the valve seat 16 and the fuel injection device returns to the normal operation. FIG. 4A shows the pressure, the timing of issuing the warning signal, and the operation of the safety valve 10 in this case.
燃料圧力制御機構が例えば高圧ポンプ２に使用されて
いる高圧力設定用のスプリングの折損により完全に異常
となると、圧室３の圧力が弁子12の設定開弁圧力より高
くなり、弁子12がリフトして当接部18がセンサ15に当接
し、センサ15から警告信号が燃料圧力制御機構に伝達さ
れる。これにより燃料圧力制御機構が高圧ポンプ２に圧
力低下の指令信号を出すが、指令信号を出しても高圧ポ
ンプ２は燃料圧力を下げることなく作動しつづけるので
高圧ポンプ２の吐出量は低下しない。このためリーク通
路11dの圧力は絞り17のため弁子12の閉弁圧力以下に降
下せず弁子12は開弁したままである。一方絞り17の流路
面積Ｃはリンプホームが可能となる面積に設定されてい
るので圧力室14の圧力はリンプホーム圧力Ｐとなってい
る。従って燃料圧力制御機構が完全に異常になってもリ
ンプホームは可能である。When the fuel pressure control mechanism becomes completely abnormal due to, for example, breakage of a high pressure setting spring used in the high pressure pump 2, the pressure in the pressure chamber 3 becomes higher than the set valve opening pressure of the valve 12 and the valve 12 Is lifted, the contact portion 18 contacts the sensor 15, and a warning signal is transmitted from the sensor 15 to the fuel pressure control mechanism. As a result, the fuel pressure control mechanism issues a pressure reduction command signal to the high pressure pump 2. However, even if the fuel pressure control mechanism issues the command signal, the discharge amount of the high pressure pump 2 does not decrease because the high pressure pump 2 continues to operate without lowering the fuel pressure. Therefore, the pressure in the leak passage 11d does not drop below the valve closing pressure of the valve 12 due to the restriction 17, and the valve 12 remains open. On the other hand, the flow path area C of the throttle 17 is set to an area where limp home is possible, so that the pressure in the pressure chamber 14 is a limp home pressure P. Therefore, limp home is possible even if the fuel pressure control mechanism becomes completely abnormal.
第４図（ロ）はこの場合の圧力、警告信号の発信時期
及び安全弁10の動作を示す。点線はリンプホーム圧力Ｐ
を示す。FIG. 4B shows the pressure, the timing of issuing the warning signal, and the operation of the safety valve 10 in this case. Dotted line is limp home pressure P
Is shown.
上記実施例においてセンサ15を接点式のリミットスイ
ッチに置き換えてもよい。又センサ15は弁子12のストッ
パの機能を有しているがストッパをセンサ15と別体にし
てもよい。In the above embodiment, the sensor 15 may be replaced with a contact type limit switch. Although the sensor 15 has a function of a stopper for the valve 12, the stopper may be provided separately from the sensor 15.
高圧ポンプの吐出量が大きい場合には絞り17の流路面
積Ｃを大きくする必要があり、これに伴い弁座16の開口
面積も大きくする必要がある。この場合には弁子12のリ
フト量を大きくするか、弁子12を第３図のようにパイロ
ット弁子22とし、燃料通路11cに弁座16に接離可能の主
弁子23を設け、これに絞り23aを設けてもよい。When the discharge amount of the high-pressure pump is large, the flow path area C of the throttle 17 needs to be increased, and accordingly, the opening area of the valve seat 16 also needs to be increased. In this case, the lift amount of the valve 12 is increased, or the valve 12 is used as a pilot valve 22 as shown in FIG. 3, and a main valve 23 which can be connected to and separated from the valve seat 16 is provided in the fuel passage 11c. An aperture 23a may be provided on this.
［効果］ この発明は上記の構成を有するので次のような優れた
効果を有する。[Effects] The present invention has the above configuration, and thus has the following excellent effects.
（イ）蓄圧室の燃料圧力が上昇しつづける場合には常開
して燃料圧力の異常上昇を防止する。(A) When the fuel pressure in the accumulator continues to increase, it is normally opened to prevent an abnormal increase in the fuel pressure.
（ロ）リンプホームに必要な圧力を確実に保持する。(B) Ensure that the pressure required for the limp home is maintained.
（ハ）弁子が開弁していることを検知することが可能で
ある場合、一時的に燃料圧力が上昇することがあって
も、一時的に開弁して燃料をリークさせたのち燃料圧力
は正常の状態に戻る。(C) If it is possible to detect that the valve is open, then even if the fuel pressure rises temporarily, open the valve temporarily to allow the fuel to leak, and then The pressure returns to normal.
第１図は本発明の一実施例の縦断正面図を示す。第２図
は蓄圧式燃料噴射装置のプロック図を示す。第３図は第
２実施例の要部の縦断正面図を示す。第４図（イ）は燃
料圧力制御機構が一時的に異常となった時の圧力、警告
信号の発信時期及び安全弁10の動作を示す図である。第
４図（ロ）は燃料圧力制御機構が完全に異常となった時
の圧力、警告信号の発信時期及び安全弁10の動作を示す
図である。 第５図、第６図及び第７図（イ）図は従来の安全弁の縦
断正面図を示す。第７図（ロ）は第７図（イ）の安全弁
の作動を示す。 １……蓄圧式燃料噴射装置 ２……高圧ポンプ ３……蓄圧室 ４……インジェクタ ５……制御ユニット（燃料圧力制御機構） 4a……噴射制御用電磁弁（燃料圧力制御機構） 10……安全弁 11……バルブボデー 11c……燃料通路 11d……リーク通路 12……弁子 15……センサ（開弁検知手段） 16……弁座 17……絞りFIG. 1 is a longitudinal sectional front view of one embodiment of the present invention. FIG. 2 shows a block diagram of the accumulator type fuel injection device. FIG. 3 is a longitudinal sectional front view of a main part of the second embodiment. FIG. 4 (a) is a diagram showing the pressure when the fuel pressure control mechanism becomes abnormal temporarily, the timing of issuing a warning signal, and the operation of the safety valve 10. FIG. 4 (b) is a diagram showing the pressure, the timing of issuing a warning signal, and the operation of the safety valve 10 when the fuel pressure control mechanism becomes completely abnormal. FIG. 5, FIG. 6 and FIG. 7 (a) show longitudinal front views of a conventional safety valve. FIG. 7 (b) shows the operation of the safety valve of FIG. 7 (a). DESCRIPTION OF SYMBOLS 1 ... Accumulation type fuel injection device 2 ... High pressure pump 3 ... Accumulation chamber 4 ... Injector 5 ... Control unit (fuel pressure control mechanism) 4a ... Injection control solenoid valve (fuel pressure control mechanism) 10 ... Safety valve 11: Valve body 11c: Fuel passage 11d: Leak passage 12: Valve 15: Sensor (valve opening detection means) 16: Valve seat 17: Throttle
Claims (2)
する蓄圧室と、 前記高圧ポンプを制御して前記蓄圧室に蓄積された高圧
燃料の圧力を制御する制御手段とを備え、 この蓄圧室に蓄積された高圧燃料を噴射して車両を駆動
する蓄圧式燃料噴射装置の安全弁であって、 前記蓄圧室より弁座に連通する燃料通路と、 前記燃料通路の前記弁座が位置する部位より連通するリ
ーク通路と、 前記燃料通路を介して伝わる前記蓄圧室内の燃料圧力が
設定値以上になった時に前記弁座より離れて弁座を開
き、前記リーク通路から燃料をリークさせる弁子とを備
え、 前記リーク通路には、前記弁座が開かれている状態で前
記高圧ポンプが燃料の全量を噴射している状態において
車両のリンプホームが可能となる量の燃料が噴射される
とともに、前記弁座が開かれている状態で前記弁子と前
記弁座間の流路面積より小さくなるように流路面積が設
定されている絞りが備えられていることを特徴とする蓄
圧式燃料噴射装置の安全弁。An accumulating chamber for accumulating high-pressure fuel supplied from a high-pressure pump; and control means for controlling the high-pressure pump to control the pressure of the high-pressure fuel accumulated in the accumulating chamber. A safety valve of a pressure-accumulation fuel injection device that drives a vehicle by injecting high-pressure fuel accumulated in a fuel passage, wherein a fuel passage communicating from the pressure accumulation chamber to a valve seat, and a portion of the fuel passage where the valve seat is located. A leak passage communicating therewith, and a valve element that opens the valve seat away from the valve seat when the fuel pressure in the pressure accumulating chamber transmitted through the fuel passage becomes equal to or higher than a set value and leaks fuel from the leak passage. In the leak passage, an amount of fuel capable of limp home of the vehicle is injected while the high pressure pump is injecting the entire amount of fuel while the valve seat is open, valve The safety valve of accumulator fuel injection apparatus, wherein a is provided with a stop which flow area is set to be smaller than the flow passage area of the valve element and in a state of being opened the valve seats.
ており、該検知手段が前記弁子が開弁されていることを
検知したとき、前記制御手段は前記蓄圧室に供給される
高圧燃料の圧力を低下させることを特徴とする特許請求
の範囲第１項に記載の蓄圧式燃料噴射装置の安全弁。A detecting means for detecting that the valve element is open, wherein the control means is supplied to the pressure accumulating chamber when the detecting means detects that the valve element is open. 2. The safety valve according to claim 1, wherein the pressure of the high-pressure fuel is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63317363A JP2600870B2 (en) | 1988-12-15 | 1988-12-15 | Pressure relief fuel injection valve safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63317363A JP2600870B2 (en) | 1988-12-15 | 1988-12-15 | Pressure relief fuel injection valve safety valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02163458A JPH02163458A (en) | 1990-06-22 |
| JP2600870B2 true JP2600870B2 (en) | 1997-04-16 |
Family
ID=18087407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63317363A Expired - Lifetime JP2600870B2 (en) | 1988-12-15 | 1988-12-15 | Pressure relief fuel injection valve safety valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2600870B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009001760B4 (en) * | 2008-04-21 | 2017-11-30 | Denso Corporation | High-pressure fuel control |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5295469A (en) * | 1990-07-09 | 1994-03-22 | Nippondenso Co., Ltd. | Safety valve for fuel injection apparatus |
| DE19822671A1 (en) * | 1998-05-20 | 1999-11-25 | Bosch Gmbh Robert | Pressure limiting valve for internal combustion engine |
| DE10157884B4 (en) | 2000-11-27 | 2013-05-08 | Denso Corporation | Accumulator fuel injection system for avoiding a malfunction of a relief valve, which is caused by pressure pulsation |
-
1988
- 1988-12-15 JP JP63317363A patent/JP2600870B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009001760B4 (en) * | 2008-04-21 | 2017-11-30 | Denso Corporation | High-pressure fuel control |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02163458A (en) | 1990-06-22 |
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