JPH0557433B2 - - Google Patents
Info
- Publication number
- JPH0557433B2 JPH0557433B2 JP59151796A JP15179684A JPH0557433B2 JP H0557433 B2 JPH0557433 B2 JP H0557433B2 JP 59151796 A JP59151796 A JP 59151796A JP 15179684 A JP15179684 A JP 15179684A JP H0557433 B2 JPH0557433 B2 JP H0557433B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- passage
- pressure chamber
- pressure
- 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 - Lifetime
Links
- 239000000446 fuel Substances 0.000 claims description 87
- 238000002347 injection Methods 0.000 claims description 51
- 239000007924 injection Substances 0.000 claims description 51
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
- F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
- F02M41/1411—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
- F02M41/1422—Injection being effected by means of a free-piston displaced by the pressure of fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、エンジンに燃料を供給する燃料噴射
装置に係わり、燃料噴射量および燃料噴射時期を
電子制御するのに好適な燃料噴射ポンプにするも
のである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a fuel injection device for supplying fuel to an engine, and provides a fuel injection pump suitable for electronically controlling fuel injection amount and fuel injection timing. It is something.
（従来技術）
従来、燃料噴射ポンプとしては、例えば特開昭
57−56660に示されるように、ポンプ回転に伴つ
て圧縮を受ける圧力室をフリーピストンによつて
２分割し、一方の圧力室部分には噴射量に係る燃
料を供給し、他方の圧力室部分には噴射時期に係
る燃料を供給する構成、すなわち液体吸入用の第
１開閉手段および加圧機構に連通した第１加圧室
と、液体吸入用の第２開閉手段および液体吐出用
の吐出通路に連通した第２加圧室と、前記第１加
圧室および前記第２加圧室の間に配置され、され
ら加圧室相互間に液体伝達可能なフリーピストン
とを備え、前記加圧機構は、回転に応じて拘束的
に加圧圧縮する圧縮機関と、少なくとも一方の加
圧室に燃料が供給されるとき非拘束的に燃料流入
を許す吸入機関とを交互に発生させるように構成
され、前記第１加圧室および前記第２加圧室へ吸
入される液体の量を制御することにより、液体の
吐出時期および吐出量を制御する燃料噴射ポンプ
の構成が知られている。(Prior art) Conventionally, as a fuel injection pump, for example,
57-56660, the pressure chamber that receives compression as the pump rotates is divided into two by a free piston, one pressure chamber is supplied with fuel according to the injection amount, and the other pressure chamber is The structure includes a configuration for supplying fuel according to the injection timing, that is, a first pressurizing chamber communicating with a first opening/closing means for liquid suction and a pressurizing mechanism, a second opening/closing means for liquid suction, and a discharge passage for liquid discharge. a second pressurizing chamber communicating with the pressurizing chamber; and a free piston disposed between the first pressurizing chamber and the second pressurizing chamber and capable of transmitting liquid between the pressurizing chambers; The mechanism is configured to alternately generate a compression engine that pressurizes and compresses in a restrictive manner according to rotation, and an intake engine that allows fuel to flow in a non-restrictive manner when fuel is supplied to at least one of the pressurizing chambers. There is known a configuration of a fuel injection pump that controls the discharge timing and amount of liquid by controlling the amount of liquid sucked into the first pressurizing chamber and the second pressurizing chamber.
（問題が解決しようとする問題点）
しかしながら、この構成は、燃料の供給量を制
御するのに第１開閉手段および第２開閉手段の２
つの開閉手段を必要とするため、構造が複雑にな
ると共に高価になるという欠点があつた。(Problem to be solved by the problem) However, in this configuration, two of the first opening/closing means and the second opening/closing means are used to control the amount of fuel supplied.
Since two opening/closing means are required, the structure is complicated and expensive.
（発明の目的）
本発明は従来知られた前記の燃料噴射ポンプの
欠点をなくして、構造が簡単で安価な電子制御が
可能である燃料噴射ポンプを提供することを目的
とする。(Object of the Invention) An object of the present invention is to eliminate the drawbacks of the above-mentioned conventionally known fuel injection pumps, and to provide a fuel injection pump that has a simple structure, is inexpensive, and can be electronically controlled.
（問題点を解決するための手段）
本発明はポンプ回転に伴つて圧縮を受ける圧力
室を噴射プランジヤを設けて２分割し、一方の圧
力室に噴射量に係わる燃料を供給し、他方の圧力
室に噴射時期に係わる燃料を供給する点において
前記従来の燃料噴射ポンプと同様であるが、それ
ぞれの圧力室に供給される燃料量を１個の開閉手
段によつて制御することを特徴とする。(Means for Solving the Problems) The present invention provides an injection plunger to divide the pressure chamber, which is compressed as the pump rotates, into two parts, supplies fuel related to the injection amount to one pressure chamber, and supplies the fuel to the other pressure chamber. It is similar to the conventional fuel injection pump in that it supplies fuel related to injection timing to the chambers, but is characterized in that the amount of fuel supplied to each pressure chamber is controlled by a single opening/closing means. .
さらに、後述する実施例に付した符号を参考に
付して説明すると、噴射プランジヤ９により分割
して形成した第１圧力室１０および第２圧力室１
１各々に、吸入燃料通路４０，１９および制御通
路１３、吐出燃料通路１８（第２，３図に図示）
を配設し、第１圧力室１０の制御通路１３と第２
圧力室１１の吸入燃料通路１９に選択的に連通す
る燃料通路１４，１６を設けると共に、その途中
に開閉手段である電磁弁１５を設ける。 Furthermore, referring to the reference numerals given to the embodiments to be described later, a first pressure chamber 10 and a second pressure chamber 1 are formed by being divided by an injection plunger 9.
1, respectively, an intake fuel passage 40, 19, a control passage 13, and a discharge fuel passage 18 (shown in FIGS. 2 and 3).
The control passage 13 of the first pressure chamber 10 and the second
Fuel passages 14 and 16 are provided which selectively communicate with the intake fuel passage 19 of the pressure chamber 11, and a solenoid valve 15 serving as an opening/closing means is provided in the middle thereof.
（作用）
吸入行程では、第１圧力室１０には吸入通路２
３，２２，４１，４０を通つて燃料が供給され、
第２圧力室１１には燃料通路１６、電磁弁１５、
燃料通路１４、吸入燃料通路１９を通つて燃料が
供給される。ここで第２圧力室１１への燃料圧
P1と第１力室１０への燃料圧P2はP1＞P2の関係
にある。従つて、電磁弁１５の開弁時期制御で第
２圧力室１１への燃料供給量（＝噴射量）が制御
されるる。吐出行程では第１圧力室１０は燃料通
路１４と連通する。従つて、電磁弁１５の閉弁時
期制御で第１圧力室１０の圧力上昇開始時期（＝
噴射時期）が制御される。(Function) In the suction stroke, the first pressure chamber 10 has a suction passage 2.
Fuel is supplied through 3, 22, 41, 40,
The second pressure chamber 11 includes a fuel passage 16, a solenoid valve 15,
Fuel is supplied through the fuel passage 14 and the intake fuel passage 19. Here, the fuel pressure to the second pressure chamber 11
P 1 and the fuel pressure P 2 to the first force chamber 10 have a relationship of P 1 >P 2 . Therefore, the amount of fuel supplied to the second pressure chamber 11 (=injection amount) is controlled by controlling the opening timing of the solenoid valve 15. During the discharge stroke, the first pressure chamber 10 communicates with the fuel passage 14. Therefore, by controlling the closing timing of the solenoid valve 15, the pressure start timing of the first pressure chamber 10 (=
injection timing) is controlled.
よつて、１個の開閉手段である電磁弁１５を開
弁することにより燃料噴射量を決定し、その電磁
弁１５を開弁することにより燃料噴射時期を制御
する。 Therefore, the fuel injection amount is determined by opening the solenoid valve 15, which is one opening/closing means, and the fuel injection timing is controlled by opening the solenoid valve 15.
（実施例）
第１図乃至第５図は、本発明の実施例に関する
ものであり、第１図は実施例の燃料吸入行程にお
ける縦断面図、第２図は実施例の燃料吐出行程に
おける縦断面図、第３図は第２図のＡ−Ａ線に沿
う断面図、第４図は第２図のＢ−Ｂ線に沿う断面
図、第５図はカムアングルの変化に対する基準信
号とカムリフトの変化、電磁弁の開閉との対応関
係を表わす作動特性図を各々示す。(Embodiment) FIGS. 1 to 5 relate to an embodiment of the present invention. FIG. 1 is a longitudinal cross-sectional view in the fuel intake stroke of the embodiment, and FIG. 2 is a longitudinal cross-sectional view in the fuel discharge stroke of the embodiment. 3 is a sectional view taken along the line A-A in Fig. 2, Fig. 4 is a sectional view taken along the line B-B in Fig. 2, and Fig. 5 shows the reference signal and cam lift for changes in cam angle. The operating characteristic diagrams showing the correspondence relationship between the changes in and the opening and closing of the solenoid valve are shown.
最初の構造について説明する。 Let's explain the first structure.
第１図において、エンジンと同期して回転する
シヤフト１の半径方向孔に嵌合する少なくとも一
対の圧送プランジヤ５、および各プランジヤの外
側に収納されたローラシユー３、およびローラ２
が設けられ、シヤフト１と共に回転する。 In FIG. 1, at least one pair of pressure-feeding plungers 5 are fitted into radial holes of a shaft 1 that rotates in synchronization with the engine, and a roller shoe 3 and a roller 2 are housed outside each plunger.
is provided and rotates together with the shaft 1.
ローラ２の外周には第４図に示すように内面に
カム形状を有するローラリング４がハウジング６
に取付けられている。シヤフト１はハウジング６
に嵌合された軸受３５と、ハウジング７に取付け
られたブツシユ８の内周とで回転自在に支持され
て回転運動を行なう。 As shown in FIG. 4, a roller ring 4 having a cam shape on the inner surface is attached to a housing 6 on the outer periphery of the roller 2.
installed on. Shaft 1 is housing 6
It is rotatably supported by a bearing 35 fitted into the housing 7 and the inner periphery of a bush 8 attached to the housing 7 to perform rotational movement.
シヤフト１の内部には、シヤフト１の中心軸方
向孔に摺動自在に嵌合された噴射プランジヤ９を
有し、圧送プランジヤ５によつて圧縮を受ける圧
縮室１００と該圧縮室１００に連通すると共に噴
射プランジヤ９の端面に臨接して形成された第１
圧力室１０、および燃料漏れを防止するため、前
記軸方向孔の右端に油密にねじ込み固定されたプ
ラグ１２と噴射プランジヤ９との間に形成された
第２圧力室１１が設けられている。 The inside of the shaft 1 has an injection plunger 9 that is slidably fitted into a hole in the central axis direction of the shaft 1, and communicates with a compression chamber 100 that is compressed by the pressure-feeding plunger 5. and a first tube formed adjacent to the end surface of the injection plunger 9.
A pressure chamber 10 and a second pressure chamber 11 are provided between the injection plunger 9 and a plug 12 screwed and fixed in an oil-tight manner to the right end of the axial hole to prevent fuel leakage.
第１圧力室１０はシヤフト１に設けられたエン
ジン気筒数と同数の吸入燃料通路４０と連通して
おり、燃料吸入行程にて、ブツシユ８に設けられ
た通路４１、およびハウジング７に設けられた通
路２２，２３と選択的に吸入通路を形成する。 The first pressure chamber 10 communicates with the same number of intake fuel passages 40 as the number of engine cylinders provided in the shaft 1, and during the fuel intake stroke, the first pressure chamber 10 communicates with the passages 41 provided in the bush 8 and the intake fuel passages 40 provided in the housing 7. A suction passage is selectively formed with the passages 22 and 23.
また、第２図に示すように、第１圧力室１０
は、シヤフト１に設けられたエンジン気筒数と同
数の制御通路１３と連通しており、燃料吐出行程
にて、ブツシユ８に設けられた燃料通路１４と選
択的に連通して、吐出制御通路を形成する。 Further, as shown in FIG. 2, the first pressure chamber 10
communicates with the same number of control passages 13 as the number of engine cylinders provided in the shaft 1, and selectively communicates with the fuel passages 14 provided in the bush 8 during the fuel discharge stroke to control the discharge control passage. Form.
第１図において、第２圧力室１１はシヤフト１
に設けられたエンジン気筒数と同数の吸入燃料通
路１９と連通しており、燃料吸入行程にて、ブツ
シユ８に設けられた前記燃料通路１４と選択的に
連通して吸入通路を形成する。 In FIG. 1, the second pressure chamber 11 is connected to the shaft 1.
It communicates with the same number of intake fuel passages 19 as the number of engine cylinders provided in the bush 8, and selectively communicates with the fuel passages 14 provided in the bush 8 during the fuel intake stroke to form an intake passage.
第３図において、第２圧力室１１はプラグ１２
に設置された通路１７、シヤフト１に設置された
吐出燃料通路１８と連通しており、燃料吐出行程
にて、ブツシユ８設置された通路２４、およびハ
ウジングに設置された通路２５と選択的に連通し
て吐出通路を形成する。 In FIG. 3, the second pressure chamber 11 is connected to the plug 12.
It communicates with a passage 17 installed in the shaft 1 and a discharge fuel passage 18 installed in the shaft 1, and selectively communicates with a passage 24 installed in the bush 8 and a passage 25 installed in the housing during the fuel discharge stroke. to form a discharge passage.
ハウジング７には通路２５と連通し、吸い戻し
弁２６を内蔵する、図示しないデリバリパイプを
取付けるためのバルブホルダ２７が取付けられて
いる。 A valve holder 27 is attached to the housing 7 for attaching a delivery pipe (not shown) that communicates with the passage 25 and includes a suction valve 26 therein.
シヤフト１には噴射プランジヤ９がプラグ１２
に接触する直前において、また接触時において第
１圧力室１０と連通するスピル孔３４が設置され
ており、スピル孔３４はブツシユ８に設けられた
通路３３、およびハウジング７７に設けられた通
路３２、および室２９、およびハウジング６に設
置された通路３１、および通路３０と連通してい
る。 The injection plunger 9 is connected to the plug 12 on the shaft 1.
A spill hole 34 is provided which communicates with the first pressure chamber 10 immediately before and at the time of contact, and the spill hole 34 is connected to a passage 33 provided in the bush 8, a passage 32 provided in the housing 77, and the chamber 29 , and the passage 31 and the passage 30 installed in the housing 6 .
第１図において、ハウジング７には、電磁弁１
５が配置されており、ブツシユ８に設けられた燃
料通路１４、およびハウジング７に設けられた燃
料通路１６の連通、遮断を行なう。 In FIG. 1, the housing 7 includes a solenoid valve 1.
5 is arranged to communicate and cut off the fuel passage 14 provided in the bush 8 and the fuel passage 16 provided in the housing 7.
前記通路１６から供給される燃料圧をP1、前
記通路２３から供給される燃料圧P2とすると、
P1＞P2の関係となるように図示しないプレツシ
ヤレギユレータが配設されている。 Assuming that the fuel pressure supplied from the passage 16 is P 1 and the fuel pressure supplied from the passage 23 is P 2 ,
A pressure regulator (not shown) is arranged so that the relationship P 1 >P 2 holds.
シヤフト１にはパルサ２０が固定され、その回
転数を回転数センサ２１で検出する。 A pulser 20 is fixed to the shaft 1, and its rotational speed is detected by a rotational speed sensor 21.
第４図において示されるように、燃料噴射ポン
プはシヤフト１の右回転によつて燃料の吸入を行
なう吸入機関θ2と圧縮吐出を行なう圧送機関θ1と
を有する。 As shown in FIG. 4, the fuel injection pump has a suction engine θ 2 that sucks in fuel by clockwise rotation of the shaft 1, and a pressure delivery engine θ 1 that compresses and discharges fuel.
なお、第４図は４気筒エンジン用燃料噴射ポン
プを例にとつて示したため、ローラリング４の内
周の４等分位置に各気筒に対応する４個のカム形
状を有する構造となつている。 In addition, since FIG. 4 shows a fuel injection pump for a four-cylinder engine as an example, the structure has four cam shapes corresponding to each cylinder at four equal positions on the inner circumference of the roller ring 4. .
次に作動について説明する。 Next, the operation will be explained.
第１図において、圧送プランジヤ５の吸入行程
では、通路１４と通路１９、および通路４０と通
路４１が連通する。 In FIG. 1, during the suction stroke of the pressure-feeding plunger 5, the passage 14 and the passage 19, and the passage 40 and the passage 41 communicate with each other.
燃料は図示せぬ燃料タンク、燃料フイルタ、セ
ジメンタを経て、一方は図示せぬ第１のプレツシ
ヤレギユレータを経て通路１６、電磁弁１５、通
路１４および通路１９を通つて第２の圧力室１１
に供給され、他方は、図示せぬ第２のプレツシヤ
レギユレータを経て通路２３から通路２２，通路
４１、および通路４０を経て第１の圧力室１０に
供給される。 The fuel passes through a fuel tank, a fuel filter, and a settler (not shown), one of which passes through a first pressure regulator (not shown), and then passes through a passage 16, a solenoid valve 15, a passage 14, and a passage 19 to a second pressure. Room 11
The other one is supplied from passage 23 to first pressure chamber 10 via passage 22, passage 41, and passage 40 via a second pressure regulator (not shown).
通路１６より供給される燃料圧は通路２３より
供給される燃料圧より高く設定されるので、第２
の圧力室１１内の圧力は第１圧力室１０内の圧力
よも高くなり、噴射プランジヤ９は図中左方へ移
動して第２圧力室１１内に満される燃料が増加す
る。 Since the fuel pressure supplied from the passage 16 is set higher than the fuel pressure supplied from the passage 23, the second
The pressure inside the pressure chamber 11 becomes higher than the pressure inside the first pressure chamber 10, the injection plunger 9 moves to the left in the figure, and the amount of fuel filling the second pressure chamber 11 increases.
一方、圧送プランジヤ５の圧送行程においては
シヤフト１の回転により、通路１４と通路１９、
および通路４０と通路４１の連通は遮断される。 On the other hand, in the pumping stroke of the pumping plunger 5, the passage 14, the passage 19,
And communication between the passage 40 and the passage 41 is cut off.
また、第２図に示すように、通路１３と通路１
４が連通すると共に、第３図に示すように、通路
１８と通路２４とが連通し、また、通路３３とス
ピル孔３４とが連通する。そして、圧送プランジ
ヤ５の移動ストロークにより、第１の圧力室１０
内の圧力が上昇するので、噴射プランジヤ９は図
中の右方へ移動し、それに伴つて第２の圧力室１
１内の圧力も上昇する。 In addition, as shown in FIG. 2, passage 13 and passage 1
4 communicate with each other, as shown in FIG. 3, the passage 18 and the passage 24 communicate with each other, and the passage 33 and the spill hole 34 communicate with each other. Then, due to the movement stroke of the pressure-feeding plunger 5, the first pressure chamber 10
As the pressure inside rises, the injection plunger 9 moves to the right in the figure, and accordingly the second pressure chamber 1
The pressure inside 1 also increases.
このため、第２の圧力室１１内の燃料は通路１
７、通路１８、通路２４、通路２５、吸戻しバル
ブ２６、通路２７を経て、図示せぬデリバリパイ
プを通つて、図示せぬノズルから噴射される。 Therefore, the fuel in the second pressure chamber 11 is transferred to the passage 1.
7, passage 18, passage 24, passage 25, suction valve 26, passage 27, and is injected from a nozzle (not shown) through a delivery pipe (not shown).
圧送の終わりにおいて、噴射プランジヤ９がプ
ラグ１２に接触する直前、または接触時にスピル
孔３４が第１の圧力室１０と連通するので第１の
圧力室１０内の圧力が低下し、噴射が終了する。 At the end of pressure feeding, the spill hole 34 communicates with the first pressure chamber 10 just before or when the injection plunger 9 contacts the plug 12, so the pressure in the first pressure chamber 10 decreases and the injection ends. .
以上の作動説明から理解されるように、第２の
圧力室１１内の燃料が圧送開始から終了迄の噴射
プランジヤ９の移動ストローク分だけ噴射される
ので、プランジヤ噴射量は圧送開始時の第２の圧
力室１１の容積、つまり、通路１６、電磁弁１
５、通路１４、通路１９を通つて第２の圧力室１
１に供給される燃料量を制御すれば、噴射量を制
御できる。 As can be understood from the above explanation of the operation, the fuel in the second pressure chamber 11 is injected by the movement stroke of the injection plunger 9 from the start to the end of pressure feeding, so the plunger injection amount is equal to the second The volume of the pressure chamber 11, that is, the passage 16, the solenoid valve 1
5, the second pressure chamber 1 through the passage 14 and the passage 19
By controlling the amount of fuel supplied to No. 1, the injection amount can be controlled.
噴射量の制御方法について説明する。 A method of controlling the injection amount will be explained.
第１図において、圧送プランジヤ５の吸入行程
においては、第２圧力室１１への燃料は電磁弁１
５を経て供給される。 In FIG. 1, during the suction stroke of the pressure-feeding plunger 5, fuel flows into the second pressure chamber 11 through the solenoid valve 1.
5.
すなわち、電磁弁１５の開弁期間を制御するこ
とにより第２圧力室１１への燃料供給量を制御で
きる。 That is, by controlling the opening period of the electromagnetic valve 15, the amount of fuel supplied to the second pressure chamber 11 can be controlled.
第５図において、エンジンのピストンまたはカ
ムの位置、または噴射ポンプのカムの位置を検出
する図示せぬ基準位置センサの出力を基準信号と
して、この基準信号からの時間t2を図示せぬコン
ピユータにより計算し、その計算結果に基づいて
電磁弁１５に開弁信号を与えると、電磁弁１５が
開弁してから、シヤフト１の回転により、通路１
４と通路１９の連通が遮断されるまでの期間、第
２圧力室１１への燃料供給が行なわれる。 In FIG. 5, the output of a reference position sensor (not shown) that detects the position of the piston or cam of the engine or the position of the cam of the injection pump is used as a reference signal, and the time t 2 from this reference signal is determined by a computer (not shown). When a valve opening signal is given to the solenoid valve 15 based on the calculation result, the solenoid valve 15 opens and the passage 1 is opened by the rotation of the shaft 1.
Fuel is supplied to the second pressure chamber 11 until communication between the second pressure chamber 4 and the passage 19 is cut off.
電磁弁１５の開弁時期を早めてt2aの時期で行
なえば、第２圧力室１１への燃料供給期間が長く
なり、供給量が多くなつて燃料噴射量は増加す
る。 If the opening timing of the electromagnetic valve 15 is advanced to the timing t 2 a, the fuel supply period to the second pressure chamber 11 becomes longer, the supply amount increases, and the fuel injection amount increases.
逆に、開弁時期を遅らせてt2bの時期にて行な
えば、燃料供給期間が短くなり燃料噴射量は増加
する。 Conversely, if the valve opening timing is delayed and performed at time t 2 b, the fuel supply period will be shortened and the fuel injection amount will be increased.
以上の説明からわかるように、電磁弁１５の開
弁時期を制御することにより、第２圧力室１１へ
の燃料供給期間を制御でき、燃料噴射量を制御で
きる。 As can be seen from the above description, by controlling the opening timing of the electromagnetic valve 15, the fuel supply period to the second pressure chamber 11 can be controlled, and the fuel injection amount can be controlled.
燃料噴射時期の制御方法につき説明する。 A method of controlling fuel injection timing will be explained.
第２図に示されるように、圧送プランジヤ５の
圧送行程において電磁弁１５が開弁している場合
には、圧送プランジヤ５の移動ストロークにより
第１の圧力室１０内の燃料は通路１３、通路１
４、電磁弁１５、通路１６を通つて流出する。 As shown in FIG. 2, when the solenoid valve 15 is open during the pressure stroke of the pressure feed plunger 5, the fuel in the first pressure chamber 10 is transferred to the passage 13 and the passage. 1
4. It flows out through the solenoid valve 15 and the passage 16.
その後、第５図において示されるように、圧送
途中の１の位置で電磁弁１５を閉弁させると、第
１の圧力室１０内の圧力が上昇して噴射プランジ
ヤ９は図中右方へ移動する。 Thereafter, as shown in FIG. 5, when the solenoid valve 15 is closed at position 1 during pressure feeding, the pressure in the first pressure chamber 10 increases and the injection plunger 9 moves to the right in the figure. do.
第３図において示されるように、第２の圧力室
１１内の燃料は、通路１７、通路１８、通路２
４、通路２５、吸戻し弁２６、通路２７を経て図
示しないノズルに圧送されて噴射される。 As shown in FIG. 3, the fuel in the second pressure chamber 11 is
4, through the passage 25, the suction-back valve 26, and the passage 27, and is force-fed to a nozzle (not shown) and is injected.
電磁弁１５の閉弁時期を早めて１ａの位置で閉
弁させると、噴射プランジヤ９が図中右方へ移動
する時期が早まり、噴射時期が早められる。 If the closing timing of the electromagnetic valve 15 is advanced and the valve is closed at the position 1a, the timing at which the injection plunger 9 moves to the right in the figure is advanced, and the injection timing is advanced.
また逆に、閉弁時期を遅らせて１ｂの位置で閉
弁させると、噴射プランジヤ９が右方へ移動する
時期が遅くなり、噴射時期は遅くなる。 Conversely, if the valve closing timing is delayed and the valve is closed at position 1b, the timing at which the injection plunger 9 moves to the right will be delayed, and the injection timing will be delayed.
このように、圧送プランジヤ５の圧送行程にお
いて、電磁弁１５の閉弁時期を制御することによ
り、圧送プランジヤ５のプレストロークが変わる
ので、噴射時期を制御できることになる。 In this way, by controlling the closing timing of the electromagnetic valve 15 during the pumping stroke of the pumping plunger 5, the pre-stroke of the pumping plunger 5 is changed, so that the injection timing can be controlled.
なお、電磁弁１５の閉弁時期は第５図において
示されるように、基準信号からの時間t1を図示せ
ぬコンピユータにより計算し、その計算結果に基
づいて電磁弁１５に閉弁信号を与えることにより
閉弁させている。 As shown in FIG. 5, the closing timing of the solenoid valve 15 is determined by calculating the time t1 from the reference signal by a computer (not shown), and giving a closing signal to the solenoid valve 15 based on the calculation result. This causes the valve to close.
以上述べた実施例では、開閉手段をシート弁型
電磁弁で構成したが、スプール弁型電磁弁を用い
ても何らさしつかえない。また、上述実施例は燃
料圧縮機構をインナーカム方式にて構成したが、
他の圧縮方式、例えば、フエイスカム方式、ある
いはアウターカム方式でも構成可能なことは、当
業者において容易に理解できよう。 In the embodiments described above, the opening/closing means is constituted by a seat valve type solenoid valve, but a spool valve type solenoid valve may also be used. Furthermore, in the above embodiment, the fuel compression mechanism was constructed using an inner cam system.
Those skilled in the art will readily understand that other compression methods, such as a face cam method or an outer cam method, are also possible.
また、第１、第２圧力室と各々に連通する吸入
通路、吐出通路は、上述の作動において説明した
様に連通するものであれば、他のものでもかまわ
ないことはいうまでもない。 Further, it goes without saying that the suction passage and the discharge passage communicating with the first and second pressure chambers may be other types as long as they communicate as explained in the above operation.
（発明の効果）
以上詳細に説明したように、本発明によれば１
個の電磁弁のみを用いることにより、その開弁時
期で噴射量を、その閉弁時期で噴射時期を制御で
きるので、構造簡単で安価な燃料噴射ポンプが得
られるという優れた効果がある。(Effects of the Invention) As explained in detail above, according to the present invention:
By using only one electromagnetic valve, the injection amount can be controlled by the valve opening timing, and the injection timing can be controlled by the valve closing timing, which has the excellent effect of providing a simple and inexpensive fuel injection pump.
第１図乃至第５図は本発明の実施例に関するも
のであり、第１図は実施例の燃料吸入行程におけ
る縦断面図、第２図は実施例の燃料吐出行程にお
ける縦断面図、第３図は第２図のＡ−Ａ線に沿う
断面図、第４図は第２図のＢ−Ｂ線に沿う断面
図、第５図はカムアングルの変化に対する基準信
号とカムリフトの変化、電磁弁の開閉との対応関
係を表わす作動特性図を各々示す。
９…噴射プランジヤ、１０…第１圧力室、１１
…第２圧力室、１３…制御通路、１４，１６…燃
料通路、１５…電磁弁、１７，１８，２４，２５
…吐出通路、１９…吸入燃料通路、４０，４１，
２２…吸入通路、１００…圧縮室。
1 to 5 relate to an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of the embodiment in the fuel intake stroke, FIG. 2 is a longitudinal sectional view of the embodiment in the fuel discharge stroke, and FIG. The figure is a cross-sectional view taken along the line A-A in Figure 2, Figure 4 is a cross-sectional view taken along the line B-B in Figure 2, and Figure 5 shows the change in reference signal and cam lift for changes in cam angle, and the solenoid valve. The operation characteristic diagrams showing the correspondence relationship with the opening and closing of each are shown. 9... Injection plunger, 10... First pressure chamber, 11
...Second pressure chamber, 13...Control passage, 14, 16...Fuel passage, 15...Solenoid valve, 17, 18, 24, 25
...Discharge passage, 19...Suction fuel passage, 40, 41,
22... Suction passage, 100... Compression chamber.
Claims (1)
０に連通した圧力室を該圧力室内に摺動自在に嵌
合した噴射プランジヤ９によつて分割して前記圧
縮室１００に連通する第１圧力室１０と、前記圧
縮室１００に連通しない第２圧力室１１とを形成
した燃料噴射ポンプにおいて、前記第１圧力室１
０に連通する制御通路１３および選択的に連通す
る吸入通路４０，４１，２２を配設し、前記第２
圧力室１１に吸入燃料通路１９および選択的に連
通する吐出通路１７，１８，２４，２５を配設
し、前記第１圧力室１０の制御通路１３と前記第
２圧力室１１の吸入燃料通路１９の各々に選択的
に連通する燃料通路１４，１６を設けると共に、
該燃料通路１４，１６の途中に１個の開閉手段１
５を設けたことを特徴とする燃料噴射ポンプ。1 Compression chamber 10 that receives compression as the pump rotates
0 is divided by an injection plunger 9 that is slidably fitted into the pressure chamber into a first pressure chamber 10 that communicates with the compression chamber 100 and a second pressure chamber that does not communicate with the compression chamber 100. In the fuel injection pump in which a pressure chamber 11 is formed, the first pressure chamber 1
0, and suction passages 40, 41, 22 selectively communicated with the second
The pressure chamber 11 is provided with an intake fuel passage 19 and discharge passages 17, 18, 24, and 25 that selectively communicate with each other, and the control passage 13 of the first pressure chamber 10 and the intake fuel passage 19 of the second pressure chamber 11 are provided. Provided with fuel passages 14 and 16 that selectively communicate with each of the
One opening/closing means 1 is provided in the middle of the fuel passages 14 and 16.
A fuel injection pump characterized in that it is provided with 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15179684A JPS6131656A (en) | 1984-07-20 | 1984-07-20 | Fuel injection pump |
| US06/755,651 US4671239A (en) | 1984-07-17 | 1985-07-16 | Fuel injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15179684A JPS6131656A (en) | 1984-07-20 | 1984-07-20 | Fuel injection pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6131656A JPS6131656A (en) | 1986-02-14 |
| JPH0557433B2 true JPH0557433B2 (en) | 1993-08-24 |
Family
ID=15526483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15179684A Granted JPS6131656A (en) | 1984-07-17 | 1984-07-20 | Fuel injection pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6131656A (en) |
-
1984
- 1984-07-20 JP JP15179684A patent/JPS6131656A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6131656A (en) | 1986-02-14 |
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