JPH0351896B2 - - Google Patents
Info
- Publication number
- JPH0351896B2 JPH0351896B2 JP2601684A JP2601684A JPH0351896B2 JP H0351896 B2 JPH0351896 B2 JP H0351896B2 JP 2601684 A JP2601684 A JP 2601684A JP 2601684 A JP2601684 A JP 2601684A JP H0351896 B2 JPH0351896 B2 JP H0351896B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- valve
- fuel injection
- inverted
- pulse
- 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
- 239000000446 fuel Substances 0.000 claims description 38
- 238000002347 injection Methods 0.000 claims description 33
- 239000007924 injection Substances 0.000 claims description 33
- 230000001960 triggered effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
Classifications
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【発明の詳細な説明】
本発明は燃料噴射弁の開弁信号発生器に関し、
更に特定して述べると、燃料噴射弁の針弁の動き
に応答して作動する検出素子から出力される信号
に基づいてこの燃料噴射弁が開いている期間を正
確に示す開弁信号を得るための開弁信号発生器に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve opening signal generator for a fuel injection valve,
More specifically, to obtain a valve opening signal that accurately indicates the period during which the fuel injection valve is open based on a signal output from a sensing element activated in response to movement of the needle valve of the fuel injection valve. This invention relates to a valve opening signal generator.
例えば、デイーゼル機関に供給される噴射量の
制御を行なう目的で、燃料の実噴射量を正確に検
出することが要求される。このような目的を達成
するため、従来では、燃料噴射弁の針弁の作動に
基づいて開弁状態にあることを示す信号を出力す
るセンサ又はスイツチを設け、このセンサ又はス
イツチからの信号に基づいて、燃料噴射弁の開弁
期間を示す開弁信号を出力するようにした装置が
種々提案されている。 For example, for the purpose of controlling the injection amount supplied to a diesel engine, it is required to accurately detect the actual injection amount of fuel. To achieve this purpose, conventionally, a sensor or switch is provided that outputs a signal indicating that the fuel injection valve is in an open state based on the operation of the needle valve of the fuel injection valve. Various devices have been proposed that output a valve-opening signal indicating the valve-opening period of a fuel injection valve.
ところで、この種の装置においては、燃料噴射
弁の開閉に応答して生じる信号に、針弁を付勢し
ているばねのバウンジングによる雑音信号が重畳
されてしまい、この雑音成分が正確な開弁時期の
検出を妨げるという問題を有しており、所望の信
号に重畳されるこの雑音成分を取除くため、種々
の回路が提案されてきている。この種の回路の１
つとして、例えば、特開昭58−82070号公報に開
示されている回路を挙げることができる。この回
路は、針弁の開閉を示す信号を取り出すため圧電
素子を用い、この圧電素子からの検出信号を所定
の基準信号とレベル比較し、これにより得られた
出力信号を単安定マルチバイブレータに入力し、
出力信号の初めての立下りタイミングで単安定マ
ルチバイブレータを作動させることによりマスク
信号を作成し、このマスク信号と出力信号とをア
ンド回路に入力し、このマスク信号を用いて、出
力信号に連らなつて発生する雑音成分をマスクし
てしまう構成となつている。しかし、この提案さ
れた回路では、出力信号によつてトリガされた単
安定マルチバイブレータからのマスク信号と出力
信号とのアンドをとる構成であるから、両信号の
伝達経路に差が生じ、各信号のタイミングにずれ
が生じてしまう。即ち、上述の回路では、単安定
マルチバイブレータにおける信号の遅延のため
に、アンド回路から得られる信号により示される
開弁期間が、実際の開弁期間より長くなつてしま
い、この信号処理回路を用いたのでは、燃料噴射
弁の開弁期間を正確に示す開弁信号を得ることが
できなかつた。 By the way, in this type of device, a noise signal due to the bouncing of the spring that biases the needle valve is superimposed on the signal generated in response to the opening and closing of the fuel injection valve, and this noise component cannot be used to accurately open or close the valve. Various circuits have been proposed to remove this noise component that is superimposed on the desired signal, which has the problem of interfering with timing detection. 1 of this kind of circuit
For example, a circuit disclosed in Japanese Patent Application Laid-open No. 82070/1983 can be mentioned. This circuit uses a piezoelectric element to extract signals indicating the opening and closing of the needle valve, compares the detection signal from this piezoelectric element with a predetermined reference signal, and inputs the resulting output signal to a monostable multivibrator. death,
Create a mask signal by activating a monostable multivibrator at the first falling timing of the output signal, input this mask signal and the output signal to an AND circuit, and use this mask signal to connect the output signal. The structure is such that it masks the noise components that occur over time. However, in this proposed circuit, the mask signal from the monostable multivibrator triggered by the output signal is ANDed with the output signal, so a difference occurs in the transmission path of both signals, and each signal There will be a difference in the timing. That is, in the above circuit, due to the signal delay in the monostable multivibrator, the valve opening period indicated by the signal obtained from the AND circuit is longer than the actual valve opening period, and this signal processing circuit is not used. Therefore, it was not possible to obtain a valve opening signal that accurately indicates the opening period of the fuel injection valve.
本発明の目的は、従つて、針弁の動きに応じて
出力されるパルス信号に基づいて燃料噴射弁の開
弁期間を正確に示す信号を得ることができる、燃
料噴射弁の開弁信号発生器を提供することにあ
る。 Therefore, an object of the present invention is to generate a valve opening signal for a fuel injector, which can obtain a signal that accurately indicates the opening period of the fuel injector based on a pulse signal output according to the movement of the needle valve. It is about providing the equipment.
本発明の構成は、燃料噴射弁の開弁期間を示す
開弁信号を発生させるための開弁信号発生器にお
いて、上記燃料噴射弁の針弁の動きに応答してパ
ルス信号を出力する手段と、該パルス信号をレベ
ル反転させて反転パルス信号を出力する反転手段
と、上記パルス信号に応答してトリガされ所定時
間だけレベルが反転される第１信号を出力する手
段と、上記反転パルス信号に応答してトリガされ
所定時間だけレベルが反転される第２信号を出力
する手段と、上記第１信号と上記第２信号とに応
答して上記燃料噴射弁の開弁期間に応じた時間幅
の開弁信号を出力する手段とを備えた点に特徴を
有する。 The present invention provides a valve opening signal generator for generating a valve opening signal indicating a valve opening period of a fuel injection valve, including means for outputting a pulse signal in response to movement of a needle valve of the fuel injection valve. , inverting means for inverting the level of the pulse signal to output an inverted pulse signal; means for outputting a first signal triggered in response to the pulse signal and having its level inverted for a predetermined time; means for outputting a second signal that is triggered in response and whose level is inverted for a predetermined time; and means for outputting a second signal whose level is inverted for a predetermined period of time; and means for outputting a second signal whose level is inverted for a predetermined period of time; The present invention is characterized in that it includes means for outputting a valve opening signal.
以下、図示の実施例により本発明を詳細に説明
する。 Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.
第１図には、本発明による開弁信号発生器の一
実施例のブロツク図が示されている。開弁信号発
生器１は、針弁２の動きに応じてオン、オフする
スイツチを備えた燃料噴射弁３の開弁期間を示す
開弁信号S0を得る場合の例である。燃料噴射弁３
は、デイーゼル機関の如き内燃機関のシリンダ内
に燃料を噴射供給するためのものであり、ノズル
ホルダ４、中間プレート５及びノズル６を備え、
これらはすべてリテイニングナツト７にねじ込ま
れている。ノズル６は、ノズルボデイ８内に形成
された案内孔９内に針弁２が滑動自在に案内され
て成つており、針弁２は、ノズルホルダ４内に形
成されたばね室１０内に収納されているコイルば
ね１１によりばね付勢され、ノズルボデイ８に形
成された弁座１２に針弁２の先端部が着座せしめ
られる構成となつている。そして、燃料通路１３
を介して油溜り１４に加圧燃料が供給されると、
この燃料圧が針弁２に作用し、針弁２がコイルば
ね１１のばね力に抗して上方に持ち上げられ、燃
料噴射弁３は開状態となる。 FIG. 1 shows a block diagram of one embodiment of a valve opening signal generator according to the present invention. The valve opening signal generator 1 is an example for obtaining a valve opening signal S0 indicating the opening period of a fuel injection valve 3, which is equipped with a switch that turns on and off according to the movement of the needle valve 2. fuel injection valve 3
is for injecting and supplying fuel into the cylinder of an internal combustion engine such as a diesel engine, and includes a nozzle holder 4, an intermediate plate 5, and a nozzle 6,
All of these are screwed into retaining nuts 7. The nozzle 6 includes a needle valve 2 slidably guided in a guide hole 9 formed in a nozzle body 8, and the needle valve 2 is housed in a spring chamber 10 formed in a nozzle holder 4. The tip of the needle valve 2 is biased by a coil spring 11, and the tip of the needle valve 2 is seated on a valve seat 12 formed in the nozzle body 8. And fuel passage 13
When pressurized fuel is supplied to the oil sump 14 via
This fuel pressure acts on the needle valve 2, the needle valve 2 is lifted upward against the spring force of the coil spring 11, and the fuel injection valve 3 is brought into an open state.
導電性材料から成る針弁２は、ばね受け１５、
コイルばね１１及び別のばね受け１６を介し、絶
縁スリーブ１７を介してノズルホルダ４に固着さ
れている電極１８と電気的に接続されている。一
方、針弁２の外周には図示しない薄い絶縁層が形
成されており、針弁２の外周とノズルボデイ８と
の間の電気的絶縁状態が保たれている。従つて、
針弁２が弁座１２に着座していて燃料噴射弁３が
閉状態にある場合には、針弁２とノズルボデイ８
との間は電気的に接続されているが、針弁２がリ
フトして燃料噴射弁３が開状態にある場合には、
針弁２とノズルボデイ８との間は電気的に絶縁状
態となつている。このように、燃料噴射弁３にお
いては、針弁２とノズルボデイ８との間に、燃料
噴射弁３の閉、開に応じてオン、オフされる機械
的スイツチが構成されている。 The needle valve 2 made of a conductive material includes a spring receiver 15,
It is electrically connected via the coil spring 11 and another spring receiver 16 to an electrode 18 fixed to the nozzle holder 4 via an insulating sleeve 17 . On the other hand, a thin insulating layer (not shown) is formed on the outer periphery of the needle valve 2, and electrical insulation between the outer periphery of the needle valve 2 and the nozzle body 8 is maintained. Therefore,
When the needle valve 2 is seated on the valve seat 12 and the fuel injection valve 3 is in the closed state, the needle valve 2 and the nozzle body 8
However, when the needle valve 2 is lifted and the fuel injection valve 3 is in the open state,
The needle valve 2 and the nozzle body 8 are electrically insulated. In this way, in the fuel injection valve 3, a mechanical switch is constructed between the needle valve 2 and the nozzle body 8, which is turned on and off in accordance with the closing and opening of the fuel injection valve 3.
このスイツチのオン、オフに応じた電気信号を
取出すため、抵抗器１９，２０を含んで成る信号
検出回路２１が構成されている。抵抗器１９の各
端部は、ノズルボデイ８と電極１８とに夫々接続
され、ノズルボデイ８はアースされ、電極１８は
抵抗器２０を介して直流電源＋Ｖに接続されてい
る。従つて、信号検出回路２１の接続点Ａには、
スイツチがオン（燃料噴射弁が閉）のときはほぼ
アースレベルで、スイツチがオフ（燃料噴射弁が
開）のときは所定の高レベルとなる検出信号S1が
現われる。この結果、燃料の噴射が行なわれる毎
に第２図ａに示す如き波形の検出信号S1が出力さ
れることになる。 A signal detection circuit 21 including resistors 19 and 20 is configured to extract an electrical signal corresponding to on/off of this switch. Each end of the resistor 19 is connected to the nozzle body 8 and the electrode 18, respectively, the nozzle body 8 is grounded, and the electrode 18 is connected to the DC power supply +V via the resistor 20. Therefore, at the connection point A of the signal detection circuit 21,
When the switch is on (the fuel injection valve is closed), the detection signal S1 is approximately at ground level, and when the switch is off (the fuel injection valve is open), the detection signal S1 is at a predetermined high level. As a result, a detection signal S1 having a waveform as shown in FIG. 2a is output every time fuel is injected.
第２図ａに示される検出信号S1の波形は、時刻
ｔ＝t1において燃料が噴射開始し、ｔ＝t2におい
て燃料が噴射を終了した場合を例にとつて示して
ある。ｔ＝t2以後において、パルス状の波形が見
られるが、これらは、コイルばね１１のバウンジ
ングにより生じる不必要な雑音波形である。 The waveform of the detection signal S 1 shown in FIG. 2a is shown taking as an example the case where fuel injection starts at time t=t 1 and fuel injection ends at t=t 2 . Although pulse-like waveforms are seen after t= t2 , these are unnecessary noise waveforms caused by the bouncing of the coil spring 11.
第２図ａに示される検出信号S1はインバータ２
３でレベル反転せしめられ、第２図ｂに示す如き
反転信号S2となる。インバータ２３を通過するこ
とによる信号の時間遅れは極く僅かであるため、
反転信号S2の立下りエツジE1のタイミングは、
検出信号S1の立上りタイミング（ｔ＝t1）にほぼ
等しくなつており、反転信号S2の立上りエツジ
E2のタイミングは、検出信号S1の立下りタイミ
ング（ｔ＝t2）にほぼ等しくなつている。 The detection signal S1 shown in FIG.
3, the level is inverted, resulting in an inverted signal S2 as shown in FIG. 2b. Since the time delay of the signal due to passing through the inverter 23 is extremely small,
The timing of the falling edge E1 of the inverted signal S2 is
It is almost equal to the rising edge of the detection signal S 1 (t=t 1 ), and the rising edge of the inverted signal S 2
The timing of E 2 is approximately equal to the falling timing (t=t 2 ) of the detection signal S 1 .
反転信号S2及び検出信号S1は、夫々、単安定マ
ルチバイブレータ２４，２５に入力されている。
単安定マルチバイブレータ２４，２５は、いずれ
も、再トリガ可能の単安定マルチバイブレータで
あつて、入力信号が低レベルから高レベルに変化
したことに応答してトリガされ、その出力レベル
を所定時間T1だけ高レベルに保つ構成となつて
いる公知の回路である。 The inverted signal S 2 and the detection signal S 1 are input to monostable multivibrators 24 and 25, respectively.
The monostable multivibrators 24 and 25 are both retriggerable monostable multivibrators, and are triggered in response to a change in the input signal from a low level to a high level, and maintain their output level for a predetermined time T. This is a known circuit configured to keep only 1 at a high level.
従つて、単安定マルチバイブレータ２４は、反
転信号S2がｔ＝t2において立上つたことに応答し
てトリガされ、第２図ｃに示す時間幅T1の第１
パルスP1を出力する。ここで、単安定マルチバ
イブレータ２５における遅延時間Δtはインバー
タのそれに比べて大きく、従つて、第１パルス
P1の立上り時刻t2よりもΔtだけ遅れることにな
る。第１パルスP1はインバータ２６によりレベ
ル反転せしめられ、反転第１パルス1としてア
ンド回路２７の一方の入力端子に印加される。
尚、インバータ２６における遅延時間は殆んど零
であるから、第１パルスP1と反転第１パルス1
との間にはタイミングのずれはほとんどない。 Therefore, the monostable multivibrator 24 is triggered in response to the rise of the inverted signal S 2 at t=t 2 and the first pulse of the time width T 1 shown in FIG.
Output pulse P 1 . Here, the delay time Δt in the monostable multivibrator 25 is larger than that of the inverter, and therefore the first pulse
This is delayed by Δt from the rise time t 2 of P 1 . The level of the first pulse P 1 is inverted by the inverter 26 and applied as the inverted first pulse 1 to one input terminal of the AND circuit 27 .
Note that since the delay time in the inverter 26 is almost zero, the first pulse P 1 and the inverted first pulse 1
There is almost no timing difference between them.
一方、単安定マルチバイブレータ２５は、検出
信号S2がｔ＝t1で立上つたことに応答してトリガ
され、第２図ｅに示す時間幅T1の第２パルスP2
を出力するが、この場合も、単安定マルチバイブ
レータ２４の場合と同様に、第２パルスP2の立
上りは時刻t1よりΔtだけ遅れることになる。 On the other hand, the monostable multivibrator 25 is triggered in response to the rise of the detection signal S 2 at t=t 1 and generates a second pulse P 2 with a time width T 1 shown in FIG.
However, in this case, as in the case of the monostable multivibrator 24, the rise of the second pulse P2 is delayed by Δt from time t1 .
第２パルス信号P2は、アンド回路２７の他方
の入力端子に印加され、反転第１パルス信号1
と第２パルス信号P2とのアンドがとられ、これ
により第２図ｆに示す開弁信号S0が得られる。こ
こで時間幅T1は、燃料噴射弁３における１回の
開弁時間、即ち時間t1からt2までの時間より必ず
長くなるように設定されており、従つて、開弁信
号S0として、時刻ｔ＝t1よりΔtだけ遅れて立上
り、時刻ｔ＝t2よりΔtだけ遅れて立下るパルス信
号が得られる。 The second pulse signal P2 is applied to the other input terminal of the AND circuit 27, and the inverted first pulse signal P2 is applied to the other input terminal of the AND circuit 27.
is ANDed with the second pulse signal P2 , thereby obtaining the valve opening signal S0 shown in FIG. 2f. Here, the time width T 1 is set to be always longer than the one-time opening time of the fuel injection valve 3, that is, the time from time t 1 to t 2 , and therefore, the valve opening signal S 0 , a pulse signal is obtained that rises after a delay of Δt from time t=t 1 and falls after a delay of Δt from time t=t 2 .
このように、アンド回路２７に入力される２つ
の信号は、同一の構成の単安定マルチバイブレー
タ２４，２５によつて同一の遅延時間Δtが与え
られる構成であるから、開弁信号S0の時間幅T0
はt2−t1となり、第２図ａに示される検出信号S1
により示される開弁時間と同一の時間を示すこと
ができる。 In this way, the two signals input to the AND circuit 27 have the same delay time Δt given by the monostable multivibrators 24 and 25 of the same configuration, so the time of the valve opening signal S 0 Width T 0
becomes t 2 −t 1 , and the detection signal S 1 shown in FIG. 2a
can indicate the same time as the valve opening time indicated by .
本発明によれば、上述の如く、燃料噴射弁の針
弁の作動に応答して出力される検出信号中に含ま
れる雑音成分を完全に除去することができるのは
勿論のこと、燃料噴射弁の開弁期間を正確に示す
開弁信号を得ることができるので、精度よく燃料
噴射量を検出することが可能となり、噴射量制御
の高精度化を促進することが期待できる。 According to the present invention, as described above, it is possible to completely remove the noise component contained in the detection signal output in response to the operation of the needle valve of the fuel injection valve, and also to Since it is possible to obtain a valve-opening signal that accurately indicates the valve-opening period of the valve, it becomes possible to detect the fuel injection amount with high precision, and it is expected that higher precision of injection amount control will be promoted.
第１図は本発明による開弁信号発生器の一実施
を示すブロツク図、第２図ａ乃至第２図ｆは第１
図に示す開弁信号発生器の各部の信号波形図であ
る。
１……開弁信号発生器、２……針弁、３……燃
料噴射弁、２１……信号検出回路、２３……イン
バータ、２４，２５……単安定マルチバイブレー
タ、２７……アンド回路、S1……検出信号、S2…
…反転信号、S0……開弁信号、P1……第１パル
ス、P2……第２パルス、1……反転第１パルス。
FIG. 1 is a block diagram showing one implementation of a valve opening signal generator according to the present invention, and FIGS.
It is a signal waveform diagram of each part of the valve opening signal generator shown in the figure. DESCRIPTION OF SYMBOLS 1... Valve opening signal generator, 2... Needle valve, 3... Fuel injection valve, 21... Signal detection circuit, 23... Inverter, 24, 25... Monostable multivibrator, 27... AND circuit, S 1 ...detection signal, S 2 ...
... Reversal signal, S 0 ... Valve opening signal, P 1 ... First pulse, P 2 ... Second pulse, 1 ... Inverted first pulse.
Claims (1)
させるための開弁信号発生器において、前記燃料
噴射弁の針弁の動きに応答してパルス信号を出力
する手段と、該パルス信号をレベル反転させて反
転パルス信号を出力する反転手段と、上記パルス
信号に応答してトリガされ所定時間だけレベルが
反転される第１信号を出力する手段と、前記反転
パルス信号に応答してトリガされ所定時間だけレ
ベルが反転される第２信号を出力する手段と、前
記第１信号と前記第２信号とに応答して前記燃料
噴射弁の開弁期間に応じた時間幅の開弁信号を出
力する手段とを備えたことを特徴とする燃料噴射
弁の開弁信号発生器。1. A valve opening signal generator for generating a valve opening signal indicating a valve opening period of a fuel injection valve, comprising means for outputting a pulse signal in response to movement of a needle valve of the fuel injection valve, and a means for outputting a pulse signal in response to movement of a needle valve of the fuel injection valve; inverting means for inverting the level and outputting an inverted pulse signal; means for outputting a first signal that is triggered in response to the pulse signal and whose level is inverted for a predetermined time; and a first signal triggered in response to the inverted pulse signal; means for outputting a second signal whose level is inverted for a predetermined time; and outputting a valve opening signal having a time width corresponding to a valve opening period of the fuel injection valve in response to the first signal and the second signal. 1. A valve opening signal generator for a fuel injection valve, comprising means for:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2601684A JPS60173341A (en) | 1984-02-16 | 1984-02-16 | Valve opening signal generator of fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2601684A JPS60173341A (en) | 1984-02-16 | 1984-02-16 | Valve opening signal generator of fuel injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60173341A JPS60173341A (en) | 1985-09-06 |
| JPH0351896B2 true JPH0351896B2 (en) | 1991-08-08 |
Family
ID=12181894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2601684A Granted JPS60173341A (en) | 1984-02-16 | 1984-02-16 | Valve opening signal generator of fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60173341A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2548563B2 (en) * | 1987-04-25 | 1996-10-30 | 株式会社ゼクセル | Needle lift detection signal discrimination circuit |
-
1984
- 1984-02-16 JP JP2601684A patent/JPS60173341A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60173341A (en) | 1985-09-06 |
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