JPS5872626A - Detecting method of injection timing - Google Patents
Detecting method of injection timingInfo
- Publication number
- JPS5872626A JPS5872626A JP17005281A JP17005281A JPS5872626A JP S5872626 A JPS5872626 A JP S5872626A JP 17005281 A JP17005281 A JP 17005281A JP 17005281 A JP17005281 A JP 17005281A JP S5872626 A JPS5872626 A JP S5872626A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- fuel
- injection timing
- fuel injection
- time
- 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.)
- Pending
Links
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)
- High-Pressure Fuel Injection Pump Control (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は噴射時期検出方法に係り、特に内燃機関によっ
て駆動されて内燃機関と同期して共動する燃料噴射ポン
プによって加圧された高圧燃料が燃料噴射弁から噴射さ
れる噴射時期を検出するのに好適な噴射時期検出方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection timing detection method, and particularly relates to a method for detecting injection timing, in which high-pressure fuel pressurized by a fuel injection pump driven by an internal combustion engine and working in synchronization with the internal combustion engine is injected from a fuel injection valve. The present invention relates to an injection timing detection method suitable for detecting injection timing.
従来、機械式燃料噴射ポンプを用いて燃料を噴射する場
合、燃料の噴射時期の検出を行ってそれをフィードバッ
クさせるという制御を行っておらず、噴射ポンプの回転
数にほぼ比例させて噴射時期を進角させていた。そして
、この噴射時期の調節は、あくまでも噴射ポンプ内部の
位相変化調節であシ、内燃機関における噴射タイミング
は噴射ポンプ装着後のマツチングに頼っていた。Conventionally, when injecting fuel using a mechanical fuel injection pump, control was not performed to detect the fuel injection timing and feed it back, but instead the injection timing was set almost proportionally to the rotation speed of the injection pump. I was making progress. This injection timing adjustment is simply a phase change adjustment inside the injection pump, and the injection timing in the internal combustion engine relies on matching after the injection pump is installed.
しかし、今後排気ガス規制等が厳しくなれば、より正確
な噴射時期制御が必要となシ、従来の方式では正確な噴
射時期が得られず、応答性に問題が生じることは明らか
である。さらに、噴射ポンプ全体の電子化が進んだ場合
は、噴射時期のより正確な検出が不可欠になる。However, if exhaust gas regulations become stricter in the future, more accurate injection timing control will be required, and it is clear that the conventional method will not be able to obtain accurate injection timing and will cause problems in response. Furthermore, as the entire injection pump becomes more electronic, more accurate detection of injection timing will become essential.
本発明は上記に鑑みてなされたもので、その目的とする
ところは、噴射時期を正確に検出することができる噴射
時期検出方法を提供することにある。The present invention has been made in view of the above, and an object thereof is to provide an injection timing detection method that can accurately detect injection timing.
本発明の特徴は、燃料噴射ポンプによって加圧された高
圧燃料の圧力が燃料噴射弁を開弁させ名圧力に到達した
時期を燃料圧力検出器により検出し、一方、上記燃料噴
射ポンプの回転数を検出し、上記圧力検出器で検出した
圧力到達時期にその高圧燃料が高圧管を経て上記燃料噴
射弁に到達してこの燃料噴射弁を開弁させるまでの時間
遅れをそのときの燃料噴射ポンプの回転数を用いて補正
し、上記燃料噴射弁から高圧燃料が噴射される噴射時期
を検出するようにした点にある。A feature of the present invention is that a fuel pressure detector detects the time when the pressure of high-pressure fuel pressurized by the fuel injection pump opens the fuel injection valve and reaches a nominal pressure, and the rotational speed of the fuel injection pump is detected by a fuel pressure detector. The fuel injection pump at that time detects the time delay until the high pressure fuel reaches the fuel injection valve via the high pressure pipe and opens the fuel injection valve at the time when the pressure detected by the pressure detector is reached. is corrected using the rotational speed of , and the injection timing at which high-pressure fuel is injected from the fuel injection valve is detected.
以下本発明の方法の一実施例を第1図、第2図を用いて
詳細に説明する。An embodiment of the method of the present invention will be described in detail below with reference to FIGS. 1 and 2.
第1図は本発明の噴射時期検出方法の一実施例を説明す
るための噴射時期検出手段を備えた燃料噴射ポンプの一
実施例を示す断面図である。第1図において、1はシャ
フト、2はシャフト1内に設けたプランジャ、3は圧縮
カム、4,6はそれぞれシャフト1に設けた第1圧力室
、第2圧力室5.7はシャトル、9はローラ、10はボ
ディ、11.12は放射口、13.14はスリーブ18
に設けた固定通路、15は噴射時期制御電磁弁、16は
噴射量制御電磁弁で、燃料は供給口17よシミ磁弁15
.16に供給される。各電磁弁15゜16は、弁駆動回
路100からの開弁パルスで燃料を計量してシャフト1
内の第1.第2圧力室4゜6へ計量した燃料を送る。燃
料通路はスリーブ18に設けた固定通路13.14とシ
ャフト1に設けた気筒数と同数の放射口11.12とが
シャフト1の回転によシ開閉することで形成される。FIG. 1 is a sectional view showing an embodiment of a fuel injection pump equipped with injection timing detection means for explaining an embodiment of the injection timing detection method of the present invention. In FIG. 1, 1 is a shaft, 2 is a plunger provided in the shaft 1, 3 is a compression cam, 4 and 6 are first pressure chambers provided in the shaft 1, respectively, second pressure chambers 5 and 7 are shuttles, and 9 is a roller, 10 is a body, 11.12 is a radiation port, 13.14 is a sleeve 18
15 is an injection timing control solenoid valve, 16 is an injection amount control solenoid valve, and the fuel is supplied from the supply port 17 to the stain solenoid valve 15.
.. 16. Each of the solenoid valves 15 and 16 measures fuel using a valve opening pulse from the valve drive circuit 100, and controls the shaft 1.
The first of these. Send the measured amount of fuel to the second pressure chamber 4°6. The fuel passage is formed by fixed passages 13, 14 provided in the sleeve 18 and radiation ports 11, 12 of the same number as the number of cylinders provided in the shaft 1, which open and close as the shaft 1 rotates.
また、ボディ10に取り付けである圧縮カム3はインナ
ーカムとなっておシ、内周に気筒数と同数の凸起部が設
けである。それぞれの圧力室4゜6へ燃料を供給後、シ
ャフト1が図示しない内燃機関によって駆動されて回転
すると、ローラ9が圧縮カム3の凸起部と接触を開始し
、プランジャ2が中心方向に押されて第1圧力室4内部
に高圧が発生する。このとき、固定通路13と放射口1
1とは閉の状態になっている。Further, the compression cam 3 attached to the body 10 is an inner cam, and the inner periphery is provided with protrusions of the same number as the number of cylinders. After supplying fuel to the respective pressure chambers 4 and 6, when the shaft 1 is driven and rotated by an internal combustion engine (not shown), the roller 9 starts to come into contact with the protrusion of the compression cam 3, and the plunger 2 is pushed toward the center. As a result, high pressure is generated inside the first pressure chamber 4. At this time, the fixed passage 13 and the radiation port 1
1 is in a closed state.
第1圧力室4内に発生した高圧によりシャトル5は右側
へ押され、第2圧力室6内の燃料を高圧にする。このと
きも固定通路14と放射口12とは閉となっている。同
時にシャフト1に設けた1個の出力口19とスリーブ1
8に設けた気筒数と同数の吐出口20とは開の状態にな
っている。したがって、第2圧力室6内の高圧燃料は、
出力口19、吐出口20よりバレル21の接続口22に
取シ付けである図示しないデリバリノ・ルプ、高圧管、
燃料噴射弁を経て内燃機関の燃焼室へ噴射される。The high pressure generated in the first pressure chamber 4 pushes the shuttle 5 to the right, making the fuel in the second pressure chamber 6 high pressure. At this time as well, the fixed passage 14 and the radiation port 12 are closed. At the same time, one output port 19 provided on the shaft 1 and the sleeve 1
The same number of discharge ports 20 as the number of cylinders provided in 8 are in an open state. Therefore, the high pressure fuel in the second pressure chamber 6 is
A delivery nozzle (not shown), a high pressure pipe, which is attached to the connection port 22 of the barrel 21 from the output port 19 and the discharge port 20,
The fuel is injected into the combustion chamber of the internal combustion engine via the fuel injection valve.
さらに噴射状態が進み、シャトル5が右側に移動すれば
、シャトル5の左端面がシャフト1に設けた逃し口23
と第1圧力室4とを通流させる。If the injection state further progresses and the shuttle 5 moves to the right, the left end surface of the shuttle 5 will be connected to the relief opening 23 provided in the shaft 1.
and the first pressure chamber 4 are made to flow together.
このとき、スリーブ18に設けた固定逃し口24とバレ
ル21に設けた第2の固定逃し口25とで通路を形成し
第1圧力室4内の高圧燃料を低圧側へ逃がすので、燃料
噴射が終了する。At this time, a passage is formed between the fixed relief port 24 provided in the sleeve 18 and the second fixed relief port 25 provided in the barrel 21, and the high pressure fuel in the first pressure chamber 4 is released to the low pressure side, so that fuel injection is performed. finish.
シャフト1の逃し口23とスリーブ18の固定逃し口2
4の開閉は、シャフト1の回転によって行われる。Relief port 23 of shaft 1 and fixed relief port 2 of sleeve 18
4 is opened and closed by rotation of the shaft 1.
ここで、噴射時期の調節は、噴射時期制御電磁弁15か
ら第1圧力室4へ供給される燃料量により行うことがで
きる。これは、仮りに供給料が多ければ(噴射時期制御
電磁弁15への開弁)々ルスの幅が長い場合)、第1図
のA−A線断面図である第2図に示すように、圧縮カム
3の突起部とロー29との接触が早い時期に行われ、進
角動作となる。反対に供給量が少なければ(噴射時期制
御電磁弁15への開弁パルスの幅が短い場合)、遅い時
期に圧縮カム3の凸起部とロー29との接触が行おれる
ので遅角動作となり、噴射時期制御が容易にできる。Here, the injection timing can be adjusted by the amount of fuel supplied from the injection timing control solenoid valve 15 to the first pressure chamber 4. If there is a large amount of feed (injection timing control solenoid valve 15 is opened), if the width of each loop is long), as shown in FIG. 2, which is a cross-sectional view taken along line A-A in FIG. , the contact between the protrusion of the compression cam 3 and the row 29 occurs at an early stage, resulting in an advance angle operation. On the other hand, if the supply amount is small (if the width of the valve opening pulse to the injection timing control solenoid valve 15 is short), the convex part of the compression cam 3 and the row 29 will come into contact at a late stage, resulting in a retarded operation. Therefore, injection timing can be easily controlled.
また、噴射量は、噴射量制御電磁弁16から第2圧力室
6へ供給される燃料の多少によシ制御できる。Further, the injection amount can be controlled depending on the amount of fuel supplied from the injection amount control solenoid valve 16 to the second pressure chamber 6.
ところで、以上述べた動作において、第2圧力室6から
吐出された燃料が図示しないデリバリパルプ、高圧管、
燃料噴射弁を経て内燃機関の燃焼室内へ噴射−されるま
でには時間遅れてか存在する。By the way, in the above-described operation, the fuel discharged from the second pressure chamber 6 is delivered to the delivery pulp, high pressure pipe,
There is a time delay before the fuel is injected into the combustion chamber of the internal combustion engine via the fuel injection valve.
このとき、時間遅れτに寄与するものは、回転数と高圧
管長さが支配的であり、高圧管長さが一定ならば、高圧
管長さにより生じる遅れ時間は定数となる。また、燃料
噴射弁の開弁圧P、についても同一の噴射弁であれば、
同一の開弁圧となる。At this time, the rotation speed and the high-pressure pipe length are dominant contributors to the time delay τ, and if the high-pressure pipe length is constant, the delay time caused by the high-pressure pipe length is a constant. Also, if the valve opening pressure P of the fuel injection valve is the same,
The valve opening pressure will be the same.
したがって、第2圧力室6の圧力が上昇し、燃料噴射弁
の開弁圧P1に到達した時刻をT1(噴射ポンプ内にお
ける噴射時期)とすれば、実際に内燃機関の燃焼室に燃
料噴射が行なわれる時刻は(T、+τ)となる。この時
刻(T、+τ)が実質的な噴射時期となる。Therefore, if the time when the pressure in the second pressure chamber 6 rises and reaches the valve opening pressure P1 of the fuel injection valve is T1 (injection timing in the injection pump), fuel is actually injected into the combustion chamber of the internal combustion engine. The time at which this is performed is (T, +τ). This time (T, +τ) becomes the actual injection timing.
そこで、本発明の実施例においては、噴射ポンプ内にお
ける噴射時期T、は、第2圧力室6内の燃料圧力が燃射
噴射弁の開弁圧と等しい圧力になる時期を、例えば、ピ
エゾ抵抗効果を利用した圧力検出器101によって検出
するようにした。また、上記の遅れ時間τの補正につい
ては、高圧管長さに依存する分については、高圧管長さ
が同一であれば定数となるから、回転数に応じて変化す
る遅れ時間のみ随時補正すればよく、そのため、噴射ポ
ンプ内に回転センサ102を取り付けて、回転センサ1
02からの信号を用いて補正するようにした。103は
補正回路で、補正回路103は圧力検出器101からの
信号と回転センサ102からの信号とを用いて噴射ポン
プ内における噴射時期に補正を行って、燃料噴射弁から
高圧燃料を噴射する実際の噴射時期を検出する。Therefore, in the embodiment of the present invention, the injection timing T in the injection pump is defined as the timing when the fuel pressure in the second pressure chamber 6 becomes equal to the valve opening pressure of the fuel injection valve. Detection is performed by a pressure detector 101 that utilizes the effect. Regarding the correction of the delay time τ mentioned above, the part that depends on the length of the high-pressure pipe will be a constant if the high-pressure pipe length is the same, so it is only necessary to correct the delay time that changes depending on the rotation speed at any time. , Therefore, the rotation sensor 102 is installed inside the injection pump, and the rotation sensor 1
The correction was made using the signal from 02. Reference numeral 103 denotes a correction circuit, which corrects the injection timing in the injection pump using the signal from the pressure detector 101 and the signal from the rotation sensor 102, and adjusts the actual injection timing of high-pressure fuel from the fuel injection valve. Detects the injection timing.
また、上記した実施例においては、この実際の噴射時期
と最適噴射時期との比較を弁駆動回路100で行って、
第1圧力室4へ供給する燃料量を増減するようにしてあ
り、これにより正確で、応答性のよい噴射時期制御が可
能に彦る。In addition, in the embodiment described above, the actual injection timing and the optimum injection timing are compared in the valve drive circuit 100.
The amount of fuel supplied to the first pressure chamber 4 is increased or decreased, thereby enabling accurate and responsive injection timing control.
以上説明したように、本発明によれば、内燃機関の燃焼
室への燃料噴射時期を正確に検出することができ、噴射
時期制御性の向上をはかることができるという効果があ
る。As described above, according to the present invention, it is possible to accurately detect the timing of fuel injection into the combustion chamber of an internal combustion engine, and it is possible to improve the controllability of the injection timing.
第1図は本発明の噴射時期検出方法の一実施例を説明す
るだめの噴射時期検出手段を備えだ燃料噴射ポンプの一
実施例を示す断面図、第2図は第1図のA−A線断面図
である゛。FIG. 1 is a cross-sectional view showing an embodiment of a fuel injection pump equipped with injection timing detection means for explaining an embodiment of the injection timing detection method of the present invention, and FIG. 2 is a cross-sectional view taken along line A-A in FIG. It is a line cross-sectional view.
Claims (1)
動する燃料噴射ポンプにおいて、該燃料噴射ポンプ内に
発生する燃料圧力が燃料噴射弁を開弁させる圧力に到達
する時期を燃料圧力検出器により検出し、該検出器で検
出した圧力到達時期にその高圧燃料が高圧管を経て前記
燃料噴射弁に到達して該燃料噴射弁を開弁させるまでの
時間遅れを前記内燃機関の回転数を検出してそのときの
回転数から求めて補正を加え、前記燃料噴射弁から高圧
燃料が噴射される噴射時期を検出することを特徴とする
噴射時期検出方法。1. In a fuel injection pump that is driven by an internal combustion engine and operates in synchronization with the internal combustion engine, a fuel pressure detector detects when the fuel pressure generated within the fuel injection pump reaches a pressure that opens the fuel injection valve. The rotational speed of the internal combustion engine is determined by the time delay until the high-pressure fuel reaches the fuel injection valve via the high-pressure pipe and opens the fuel injection valve at the timing when the pressure detected by the detector is reached. 1. An injection timing detection method, comprising detecting and correcting the rotational speed based on the rotational speed at that time to detect an injection timing at which high-pressure fuel is injected from the fuel injection valve.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17005281A JPS5872626A (en) | 1981-10-26 | 1981-10-26 | Detecting method of injection timing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17005281A JPS5872626A (en) | 1981-10-26 | 1981-10-26 | Detecting method of injection timing |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5872626A true JPS5872626A (en) | 1983-04-30 |
Family
ID=15897724
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17005281A Pending JPS5872626A (en) | 1981-10-26 | 1981-10-26 | Detecting method of injection timing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5872626A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63500732A (en) * | 1985-09-03 | 1988-03-17 | フォーカス・リミテッド | fuel injection monitoring device |
US6371078B1 (en) | 1999-08-23 | 2002-04-16 | Ngk Spark Plug Co., Ltd. | Method of controlling a direct fuel injection engine and storage medium storing the same |
-
1981
- 1981-10-26 JP JP17005281A patent/JPS5872626A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63500732A (en) * | 1985-09-03 | 1988-03-17 | フォーカス・リミテッド | fuel injection monitoring device |
US6371078B1 (en) | 1999-08-23 | 2002-04-16 | Ngk Spark Plug Co., Ltd. | Method of controlling a direct fuel injection engine and storage medium storing the same |
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