JPS637259B2 - - Google Patents
Info
- Publication number
- JPS637259B2 JPS637259B2 JP56179595A JP17959581A JPS637259B2 JP S637259 B2 JPS637259 B2 JP S637259B2 JP 56179595 A JP56179595 A JP 56179595A JP 17959581 A JP17959581 A JP 17959581A JP S637259 B2 JPS637259 B2 JP S637259B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- fuel injection
- valve
- lift sensor
- 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.)
- Expired
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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/063—Lift of the valve needle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- 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】
本発明はデイーゼルエンジンにおける燃料噴射
弁の燃料噴射時間測定装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection time measuring device for a fuel injection valve in a diesel engine.
従来のこの種の燃料噴射時間測定装置として
は、第１図に示すような特願昭56−45649号によ
つて提案されたものがあり、ここで、１は噴孔２
を有するノズルチツプであり、このノズルチツプ
１は燃料噴射弁３の先端部に組み込まれている。
針弁４はホルダ５を介して設けられたばね６のば
ね力によりノズルチツプ１のシート部７に常時付
勢されている。そこで、高圧燃料が燃料供給通路
８を介して供給されると、針弁４がばね６のばね
力に抗して上方に押し上げられる。このとき、ば
ね６を押し上げる力が接地板９を介して例えば圧
電素子を用いたリフトセンサ１０に加えられ、リ
フトセンサ１０に起電力が発生するようになつて
いる。なお、１１はリフトセンサ１０の起電力を
取出す電極、１２は絶縁体、１３はシールリン
グ、１４はスピル、１５は燃料噴射弁に接続され
た燃料インレツトである。 As a conventional fuel injection time measuring device of this kind, there is one proposed in Japanese Patent Application No. 56-45649 as shown in Fig. 1, where 1 indicates nozzle hole 2.
This nozzle chip 1 is assembled into the tip of a fuel injection valve 3.
The needle valve 4 is always urged against the seat 7 of the nozzle tip 1 by the force of a spring 6 provided through a holder 5. Therefore, when high-pressure fuel is supplied through the fuel supply passage 8, the needle valve 4 is pushed upward against the spring force of the spring 6. At this time, a force pushing up the spring 6 is applied to the lift sensor 10 using, for example, a piezoelectric element via the ground plate 9, and an electromotive force is generated in the lift sensor 10. Note that 11 is an electrode for extracting the electromotive force of the lift sensor 10, 12 is an insulator, 13 is a seal ring, 14 is a spill, and 15 is a fuel inlet connected to a fuel injection valve.
このように構成された燃料噴射弁においては、
リフトセンサ１０に生ずる起電力を電極１１から
取出し、この情報により燃料噴射弁３の針弁４の
リフト状態を検知して燃料噴射弁３の開弁時間を
測定し、更に、この測定情報から燃料噴射量を算
出して目標燃料噴射量との差異を求めその差を修
正制御するようになつている。 In the fuel injection valve configured in this way,
The electromotive force generated in the lift sensor 10 is taken out from the electrode 11, the lift state of the needle valve 4 of the fuel injection valve 3 is detected using this information, the opening time of the fuel injection valve 3 is measured, and the fuel The injection amount is calculated, the difference from the target fuel injection amount is found, and the difference is corrected and controlled.
しかしながら、このような燃料噴射時間測定装
置にあつては、エンジンの回転速度の変化によつ
て高圧ポンプから圧送される燃料の圧力上昇速度
が変化するので、針弁４の変位量がエンジン回転
数によつて変化する。従つて、第２図ＡおよびＢ
に示すように、リフトセンサ１０から得られる出
力電圧の大きさに差異を生じ、エンジンの低速回
転では第２図Ａに示すように出力電圧が低くな
り、また、高速回転では第２図Ｂに示すように出
力電圧が高くなる。殊に、高圧ポンプからの燃料
供給が終了した時点では針弁４がバウンシング現
象を起こすので、リフトセンサ１０からの出力信
号に振動成分が付加されてしまう。従つて、出力
信号の検出レベルがエンジンの最小回転時に合わ
せてあると、エンジンの回転速度が大きい場合に
は、第２図Ｂに示すように、針弁４のバウンシン
グ現象による振動成分をも検知することになる。 However, in such a fuel injection time measuring device, the rate of pressure rise of the fuel pumped from the high-pressure pump changes depending on the change in engine speed, so the amount of displacement of the needle valve 4 depends on the engine speed. It changes depending on. Therefore, Figure 2 A and B
As shown in Figure 2, there is a difference in the output voltage obtained from the lift sensor 10, and when the engine rotates at low speed, the output voltage becomes low as shown in Figure 2A, and when the engine rotates at high speed, it becomes lower as shown in Figure 2B. As shown, the output voltage increases. In particular, since the needle valve 4 causes a bouncing phenomenon when the fuel supply from the high-pressure pump ends, a vibration component is added to the output signal from the lift sensor 10. Therefore, if the detection level of the output signal is set to the minimum rotation of the engine, if the engine rotation speed is high, the vibration component due to the bouncing phenomenon of the needle valve 4 will also be detected, as shown in FIG. 2B. I will do it.
本発明の目的は、上述した欠点を除去し、燃料
噴射弁の針弁の変位に対応した第１の信号を出力
するリフトセンサと、リフトセンサの出力信号と
基準電圧信号とを比較して第２の信号を出力する
比較手段（例えば後述の比較器２０に相当）と、
比較手段の出力信号の立下りでトリガされて所定
時間だけ反転される第３の信号を得る手段（例え
ば後述の単安定マルチバイブレータ３０に相当）
と、第２の信号と第３の信号とにより燃料噴射弁
の開弁に対応した第４の信号を得る開弁信号形成
手段（例えば後述のアンド回路４０に相当）とを
有し、第４の信号に基づいて開弁時間を検出する
ようにしたことを特徴とするデイーゼルエンジン
の燃料噴射時間測定装置を提供することにある。 An object of the present invention is to eliminate the above-mentioned drawbacks and provide a lift sensor that outputs a first signal corresponding to the displacement of a needle valve of a fuel injection valve, and a lift sensor that outputs a first signal corresponding to the displacement of a needle valve of a fuel injection valve. Comparing means (e.g., corresponding to the comparator 20 described later) outputting the signal No. 2;
Means for obtaining a third signal that is triggered by the fall of the output signal of the comparison means and inverted for a predetermined time (e.g., corresponds to the monostable multivibrator 30 described later)
and a valve opening signal forming means (for example, corresponding to an AND circuit 40 described later) for obtaining a fourth signal corresponding to the opening of the fuel injection valve from the second signal and the third signal. An object of the present invention is to provide a fuel injection time measuring device for a diesel engine, which is characterized in that the valve opening time is detected based on the signal.
以下、本発明を図面に基づいて詳細に説明す
る。 Hereinafter, the present invention will be explained in detail based on the drawings.
なお、本発明に用いる燃料噴射弁は、第１図と
同様の構成であるので、この燃料噴射弁について
の詳細説明は省略する。 Incidentally, since the fuel injection valve used in the present invention has the same configuration as that shown in FIG. 1, detailed explanation of this fuel injection valve will be omitted.
第３図は本発明による制御回路の構成例を示
し、１０は燃料噴射弁３に配設した前述のリフト
センサであり、このリフトセンサ１０の第１の出
力信号Ｓ１（第４図Ａ参照）を比較器２０の一方
の端子に供給する。また、比較器２０の他方の端
子には所定の比較電圧VREFを供給しておく。比較
器２０ではこの２つの入力信号を比較して第２の
誤差信号Ｓ２（第４図Ｂ参照）を出力し、この誤
差信号Ｓ２を単安定マルチバイブレータ３０に供
給するとともに、アンド回路４０にも直接供給す
る。単安定マルチバイブレータ３０は誤差信号Ｓ
２の立下りでトリガされるもので、所定の時間Ｔ
１の間だけ“Ｌ”レベルに保たれる第３の出力信
号Ｓ３（第４図Ｃ参照）をアンドゲート４０に供
給する。開弁信号形成回路としてのアンド回路４
０では出力信号Ｓ２とＳ３とで論理積をとり、第
４の出力信号Ｓ４を出力する。（第４図Ｄ参照）。 FIG. 3 shows a configuration example of a control circuit according to the present invention, and 10 is the aforementioned lift sensor disposed on the fuel injection valve 3, and the first output signal S1 of this lift sensor 10 (see FIG. 4A) is supplied to one terminal of the comparator 20. Further, a predetermined comparison voltage V REF is supplied to the other terminal of the comparator 20. The comparator 20 compares these two input signals and outputs a second error signal S2 (see FIG. 4B), which is supplied to the monostable multivibrator 30 and also to the AND circuit 40. supply directly. The monostable multivibrator 30 has an error signal S
2 is triggered at the falling edge of T
The AND gate 40 is supplied with a third output signal S3 (see FIG. 4C) which is kept at the "L" level for only one period. AND circuit 4 as a valve opening signal forming circuit
At 0, the output signals S2 and S3 are ANDed and a fourth output signal S4 is output. (See Figure 4D).
このように構成した燃料噴射弁の燃料噴射時間
測定装置においては、燃料噴射弁に高圧燃料を供
給されると、針弁４が上方に変位し、これにより
ばね６を介してリフトセンサ１０にかかる押圧力
が増加して、リフトセンサ１０から例えば第４図
Ａに示すような出力信号Ｓ１が取り出される。こ
の信号Ｓ１を比較器２０に供給すると、比較器２
０では出力信号Ｓ１と基準電圧VREFとを比較して
誤差信号Ｓ２を得る。その誤差信号Ｓ２が単安定
マルチバイブレータ３０とアンド回路４０とに供
給されると、単安定マルチバイブレータ３０は、
第４図Ｃに示すように、誤差信号Ｓ２の立下りで
トリガされて、時間Ｔ１の間だけ“Ｌ”レベルの
出力信号Ｓ３を得、その信号をアンド回路４０に
供給する。出力信号Ｓ２およびＳ３が供給された
アンド回路４０では論理積をとり、出力信号Ｓ４
を出力する。よつて、ここで出力信号Ｓ３の
“Ｌ”レベルの時間Ｔ１を、出力信号Ｓ２に含ま
れる振動成分の残存時間に対応させるように設定
することにより、誤差信号Ｓ２の振動成分を除去
することができる。従つて、信号Ｓ４において噴
射開始時期TSから噴射終了時期TFまでの燃料噴
射時間Ｔ２を、その間のクロツクパルス（図示せ
ず）を計数することにより測定することによつ
て、正確な燃料噴射時間を測定することができ
る。 In the fuel injection time measuring device for a fuel injection valve configured as described above, when high-pressure fuel is supplied to the fuel injection valve, the needle valve 4 is displaced upward, and the needle valve 4 is thereby applied to the lift sensor 10 via the spring 6. As the pressing force increases, an output signal S1 as shown in FIG. 4A, for example, is taken out from the lift sensor 10. When this signal S1 is supplied to the comparator 20, the comparator 2
0, the output signal S1 is compared with the reference voltage V REF to obtain the error signal S2. When the error signal S2 is supplied to the monostable multivibrator 30 and the AND circuit 40, the monostable multivibrator 30
As shown in FIG. 4C, it is triggered by the fall of the error signal S2 to obtain an output signal S3 of "L" level only during time T1, and supplies this signal to the AND circuit 40. The AND circuit 40 to which the output signals S2 and S3 are supplied performs a logical product and outputs the output signal S4.
Output. Therefore, by setting the "L" level time T1 of the output signal S3 to correspond to the remaining time of the vibration component included in the output signal S2, the vibration component of the error signal S2 can be removed. can. Therefore, by measuring the fuel injection time T2 from the injection start time TS to the injection end time TF in the signal S4 by counting clock pulses (not shown) during that time, the accurate fuel injection time can be measured. can do.
以上説明してきたように、本発明によれば、燃
料噴射弁の針弁の変位に対応した第１の信号を出
力するリフトセンサと、リフトセンサの出力信号
と基準電圧信号とを比較して第２の信号を出力す
る比較手段（例えば先に述べた比較器２０に相
当）と、比較手段の出力信号の立下りでトリガさ
れて所定時間だけ反転される第３の信号を得る手
段（例えば先に述べた単安定マルチバイブレータ
３０に相当）と、第２の信号と第３の信号とによ
り燃料噴射弁の開弁に対応した第４の信号を得る
開弁信号形成手段（例えば先に述べたアンド回路
４０に相当）とを有し、第４の信号に基づいて開
弁時間を検出するようにしたので、リフトセンサ
の出力信号に含まれる振動成分を除去でき、有効
成分のみを検出することができる。従つて、燃料
噴射弁の燃料噴射時間を正確に測定することがで
きる。 As described above, according to the present invention, the lift sensor outputs the first signal corresponding to the displacement of the needle valve of the fuel injection valve, and the lift sensor outputs the first signal corresponding to the displacement of the needle valve of the fuel injection valve. Comparing means for outputting the second signal (for example, corresponding to the comparator 20 mentioned earlier), and means for obtaining a third signal that is triggered by the fall of the output signal of the comparing means and inverted for a predetermined time (for example, the (corresponding to the monostable multivibrator 30 described above), and a valve opening signal forming means (e.g., the above-mentioned Since the valve opening time is detected based on the fourth signal, the vibration component contained in the output signal of the lift sensor can be removed, and only the effective component can be detected. Can be done. Therefore, the fuel injection time of the fuel injection valve can be accurately measured.
第１図は本発明に用いられるリフトセンサ付燃
料噴射弁の１例を示す断面図、第２図Ａはエンジ
ンの低速回転時におけるリフトセンサの出力信号
を示す波形図、第２図Ｂはエンジンの高速回転時
におけるリフトセンサの出力信号を示す波形図、
第３図は本発明に用いる制御回路の構成例を示す
ブロツク図、第４図Ａ〜Ｄはその各端子からの出
力信号をそれぞれ示す波形図である。
１……ノズルチツプ、２……噴孔、３……燃料
噴射弁、４……針弁、５……ホルダ、６……ば
ね、７……シート部、８……燃料供給通路、９…
…接地板、１０……リフトセンサ、１１……電
極、１２……絶縁体、１３……シールリング、１
４……スピル、１５……燃料インレツト、２０…
…比較器、３０……単安定マルチバイブレータ、
４０……アンド回路（開弁信号形成回路）。
FIG. 1 is a sectional view showing an example of a fuel injection valve with a lift sensor used in the present invention, FIG. 2A is a waveform diagram showing the output signal of the lift sensor when the engine is rotating at low speed, and FIG. 2B is an engine A waveform diagram showing the output signal of the lift sensor during high-speed rotation of
FIG. 3 is a block diagram showing a configuration example of a control circuit used in the present invention, and FIGS. 4A to 4D are waveform diagrams showing output signals from each terminal thereof. DESCRIPTION OF SYMBOLS 1... Nozzle chip, 2... Nozzle hole, 3... Fuel injection valve, 4... Needle valve, 5... Holder, 6... Spring, 7... Seat portion, 8... Fuel supply passage, 9...
...Ground plate, 10...Lift sensor, 11...Electrode, 12...Insulator, 13...Seal ring, 1
4...Spill, 15...Fuel inlet, 20...
... Comparator, 30 ... Monostable multivibrator,
40...AND circuit (valve opening signal forming circuit).
Claims (1)
号を出力するリフトセンサと、該リフトセンサの
出力信号と基準電圧信号とを比較して第２の信号
を出力する比較手段と、該比較手段の出力信号の
立下りでトリガされて所定時間だけ反転される第
３の信号を得る手段と、前記第２の信号と前記第
３の信号とにより前記燃料噴射弁の開弁に対応し
た第４の信号を得る開弁信号形成手段とを有し、
前記第４の信号に基づいて開弁時間を検出するよ
うにしたことを特徴とするデイーゼルエンジンの
燃料噴射時間測定装置。1 a lift sensor that outputs a first signal corresponding to the displacement of the needle valve of the fuel injection valve; a comparison means that compares the output signal of the lift sensor with a reference voltage signal and outputs a second signal; means for obtaining a third signal that is triggered by a falling edge of the output signal of the comparing means and inverted for a predetermined period of time; valve opening signal forming means for obtaining a fourth signal;
A fuel injection time measuring device for a diesel engine, characterized in that a valve opening time is detected based on the fourth signal.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17959581A JPS5882070A (en) | 1981-11-11 | 1981-11-11 | Fuel injection period measuring apparatus for diesel engine |
| DE8282109943T DE3279372D1 (en) | 1981-11-11 | 1982-10-27 | Fuel injection detecting system for a diesel engine |
| EP82109943A EP0078987B1 (en) | 1981-11-11 | 1982-10-27 | Fuel injection detecting system for a diesel engine |
| US06/437,680 US4669440A (en) | 1981-11-11 | 1982-10-29 | Fuel injection detecting system for a diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17959581A JPS5882070A (en) | 1981-11-11 | 1981-11-11 | Fuel injection period measuring apparatus for diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5882070A JPS5882070A (en) | 1983-05-17 |
| JPS637259B2 true JPS637259B2 (en) | 1988-02-16 |
Family
ID=16068472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17959581A Granted JPS5882070A (en) | 1981-11-11 | 1981-11-11 | Fuel injection period measuring apparatus for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5882070A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6053561U (en) * | 1983-09-20 | 1985-04-15 | アルプス電気株式会社 | printer paper feeder |
| JP2548563B2 (en) * | 1987-04-25 | 1996-10-30 | 株式会社ゼクセル | Needle lift detection signal discrimination circuit |
| JP4911197B2 (en) * | 2009-06-01 | 2012-04-04 | 株式会社デンソー | Control device for direct acting fuel injection valve |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5254833A (en) * | 1975-10-29 | 1977-05-04 | Diesel Kiki Co Ltd | Diagnosis device for diesel engine |
| US4131014A (en) * | 1977-06-07 | 1978-12-26 | Caterpillar Tractor Co. | Dynamic timing indicating apparatus |
| JPS56113044A (en) * | 1980-02-13 | 1981-09-05 | Nissan Motor Co Ltd | Injection timing sensor |
-
1981
- 1981-11-11 JP JP17959581A patent/JPS5882070A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5882070A (en) | 1983-05-17 |
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