JPS608473A - Control device for curret conduction to glow plug - Google Patents
Control device for curret conduction to glow plugInfo
- Publication number
- JPS608473A JPS608473A JP11772183A JP11772183A JPS608473A JP S608473 A JPS608473 A JP S608473A JP 11772183 A JP11772183 A JP 11772183A JP 11772183 A JP11772183 A JP 11772183A JP S608473 A JPS608473 A JP S608473A
- Authority
- JP
- Japan
- Prior art keywords
- glow plug
- timer
- relay
- temperature
- 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
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
- F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
- F02P19/021—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs characterised by power delivery controls
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はディーゼル機８！１などの内Ｍ機関に装着され
るグロープラグの温度を最適に制御するための通電制御
装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an energization control device for optimally controlling the temperature of a glow plug installed in an internal engine such as a diesel engine 8!1.
従来よりグロープラグの通電制御装置はグロープラグの
昇温特性とタイマーの充電特性および冷却特性と放電特
性を同期させて制御するものが提案されている。しかる
にエンジン始動開始時のバッテリー電圧の低下および燃
料噴霧によるグロープラグＳＩＮの低下により前記同期
性が不十分とく【す、円滑なエンジン始動ができにくい
場合が生じ、また−ロエンジンを始動すべくキースイッ
チを操作してもドライバーによってはそのま二１放関し
、１（（（用にグロープラグを加熱し耐久性を低下させ
る場合も生じやすい。BACKGROUND ART Conventionally, glow plug energization control devices have been proposed that synchronize and control the temperature increase characteristics of the glow plug, the charging characteristics of the timer, the cooling characteristics, and the discharge characteristics of the glow plug. However, due to a drop in battery voltage at the start of engine startup and a drop in glow plug SIN due to fuel spray, the synchronization may be insufficient and it may be difficult to start the engine smoothly. Even if the switch is operated, depending on the driver, the glow plug may be left unattended, or the glow plug may heat up and its durability may be reduced.
本発明の目的は、加熱特性の同期をはかる回路ど併ｌ−
で表示装置とタイマＴ１とを連動させる補正回路を設り
ることで、確実にエンジン始動ができ、且つ、無用なグ
ロープラグへの通電が確実に防止できグロープラグの耐
久性および信頼性を向上させることができるグロープラ
グの通電制御装置を提供することにある。 本発明のグ
ロープラグの通電制御装置は、第１図に示す如く急速加
熱型グロープラグＧと、該グ［１−プラグＧへ大電流を
供給する急速昇温用通電リレー１と、該グロープラグＧ
へ電流制御用抵抗器３を介して通電する温度維持用通電
リレー２と、グロープラグがエンジンの始動許容温度以
上になったとき運転者に認識させるための表示装置５と
、前記リレー１を制御するタイマＴ１と、リレー２を制
御するタイマＴ３と、前記表示装置５を制御するＴ２と
からなり、通電開始後所定「４間リレー１によりグ０−
プシグＧに大電流を供給して前記グロープラグＧを急速
に昇温ざゼ、所定時間経過後はリレー２を介して通電し
て一定時間グローブラグＧの温度を維持するグロープラ
グの通電制御装置において、前記タイマＴ２の出力時間
の終了により前記タイマＴ１の出ツノを反転さ「てリレ
ーｊをＯＦ Ｆさじ、スタータモータへの通電信号を入
力することにより前記タイマＴ１の出力の反転を解消す
る補正回路７を設【）たことを構成とする。An object of the present invention is to provide a circuit for synchronizing heating characteristics.
By installing a correction circuit that interlocks the display device and timer T1, the engine can be started reliably, and unnecessary energization of the glow plug can be reliably prevented, improving the durability and reliability of the glow plug. An object of the present invention is to provide a glow plug energization control device that can control the current flow of a glow plug. As shown in FIG. 1, the glow plug energization control device of the present invention includes a rapid heating type glow plug G, a rapid heating energization relay 1 for supplying a large current to the glow plug G, and a rapid heating energization relay 1 that supplies a large current to the glow plug G. G
A temperature maintenance energizing relay 2 that energizes through a current control resistor 3; a display device 5 for making the driver aware when the glow plug has reached the engine starting permissible temperature; and controlling the relay 1. It consists of a timer T1 that controls the relay 2, a timer T3 that controls the relay 2, and a timer T2 that controls the display device 5.
A glow plug energization control device that supplies a large current to the glow plug G to rapidly raise the temperature of the glow plug G, and after a predetermined time has elapsed, energizes it via a relay 2 to maintain the temperature of the glow plug G for a certain period of time. At the end of the output time of the timer T2, the output of the timer T1 is reversed, relay j is turned off, and an energization signal is input to the starter motor, thereby eliminating the inversion of the output of the timer T1. The configuration is that a correction circuit 7 is provided.
つぎに本発明にかかるグロープラグの通電制御装置の実
施例を第２図に示すグロープラグ通電制御回路図と第３
図の動作タイムチャー１〜に基づき説明する。Next, an embodiment of the glow plug energization control device according to the present invention is shown in the glow plug energization control circuit diagram shown in FIG.
The explanation will be based on operation time charts 1 to 1 in the figure.
第２図において、ＢＡＴはバッテリー、Ｇはエンジンの
副燃焼室に装着された急速貸温用グロープラグ、Ｓはバ
ッテリーＢ Ａ Ｔ’に直列に設けられ、ＯＦＦ端子、
グロープラグＧ通電用のＯＮ端子、およびグロープラグ
Ｇとスタータモータとへの通電のためのＳＴ端子を有す
るキースイッチ、１はグロ−プラグを急速に昇温させる
目的で大電流を供給するための急速昇温用リレー、２は
グロープラグＧが所定温度に昇温した後、その温度を維
持ざＣる目的で電流制限用抵抗器３を介して限定された
電流を通電するだめの温度維持用通電リレー、４はリレ
ー１とリレー２とを制御ザる通電制御回路である。ＯＰ
はタイマＴ１を構成するコンパレータからなる比較器、
Ｂは電圧検出回路、Ｃ１はタイマＴ１の時定数決定のた
めのコンデンサ、ＶｌはコンデンサＣ１の充電電圧、Ｖ
２はタイマ丁１の基準電圧、Ｒ１−Ｒ８は抵抗、Ｄ１〜
Ｄ６はダイオード、但しＣ６は定電圧ダイオード、Ｃ２
はコンデンサ、Ｄはインバータ、Ｅは増幅器、ｒ２は始
動表示ランプ５の制御タイマ、６は温度センサ（例えば
水温センサ）、Ｆは完爆検出回路、Ｔ３はアフターグロ
ーのためのリレー２制御タイマである。本発明の補正回
路１はコンデンサＣ２と、抵抗Ｒ４、Ｒ６と、ダイオー
ドＤ２ 、Ｃ３、Ｃ４、Ｃ５とから構成される。In Fig. 2, BAT is a battery, G is a glow plug for rapid warming installed in the sub-combustion chamber of the engine, S is connected in series with the battery BAT', and an OFF terminal;
A key switch having an ON terminal for energizing the glow plug G and an ST terminal for energizing the glow plug G and the starter motor; 1 is a key switch for supplying a large current for the purpose of rapidly raising the temperature of the glow plug; Rapid temperature increase relay 2 is for temperature maintenance, after the glow plug G has risen to a predetermined temperature, a limited current is passed through the current limiting resistor 3 in order to maintain that temperature. Energization relay 4 is an energization control circuit that controls relay 1 and relay 2. OP
is a comparator consisting of a comparator that constitutes timer T1,
B is a voltage detection circuit, C1 is a capacitor for determining the time constant of timer T1, Vl is a charging voltage of capacitor C1, and V
2 is the reference voltage of timer 1, R1-R8 are resistors, D1~
D6 is a diode, however, C6 is a constant voltage diode, C2
is a capacitor, D is an inverter, E is an amplifier, r2 is a control timer for the start indicator lamp 5, 6 is a temperature sensor (for example, a water temperature sensor), F is a complete explosion detection circuit, and T3 is a relay 2 control timer for afterglow. be. The correction circuit 1 of the present invention is composed of a capacitor C2, resistors R4 and R6, and diodes D2, C3, C4 and C5.
エンジン始動のため第３図（ア）に示す如く運転者がキ
ースイッチＳをＯＦＦ端子からＯＮ端子へり換ると、コ
ンデンサＣ１は、ダイオード［）１、抵抗Ｒ１を介して
充電され始め、第３図（イ）に示す如くコンデン１１Ｃ
１の端子電圧Ｖ１が基準電圧Ｖ２になるまで、第３図（
つ）゛に示す如くタイマＴ１は後述するように時間ｔ１
１の間ハイレベルの出力を生じる。タイマＴ１がハイレ
ベルの出力中は第３図（力）に示す如く増巾器を介しＣ
リレー１はＯＮ作動される。これによりリレー１は接点
を閉じ、グロープラグＧに大電圧が供給され、グロープ
ラグＧは第３図（ケ）に示す如く急速に昇温して短時間
（定格は電圧１２ポル１−で９００℃まで６秒間）でエ
ンジンの始動に必要な６００℃以上１００℃以下の必要
温度に達する。外気の温度が低い時（たとえば−２５℃
以下）にも水温センサ６によってタイマＴ２とタイマＴ
３の出力時間が延長され必要温度に達する。またキース
イッチｓ（ＤＯＮ Ｃａｌ＋子の接続によりタイマＴ２
は第３図（１）に示す如く時間Ｔ２の聞出力を生じ、イ
ンバータＤを介して第３図（り）に示す如く表示装置の
ランプ５を点灯し、タイムアツプ後表示装置のランプ５
を消灯さｌる。第３図（１）に示ず如く第１の予熱時間
とするタイマＴ２の出力時間ｔ２を経過するとタイマＴ
２の出ツノがローレベルに反転覆−るので、タイマＴ１
の基準電圧ｖ２は抵抗Ｒ２、Ｒ４、Ｒ５およびダイオー
ドＤ２で決定される値からダイオードＤ４、抵抗Ｒ６を
介してタイマ下２内で接地されて第３図（イ〉に示す如
く接地レベルに近いＶ２４に変更される。そのため比較
器○Ｐは入力電圧がＶｌ ＞Ｖ２となり、その出力をロ
ーレベルに反転させ、第３図（力）に示す如くリレー１
は一旦ＯＦＦとしグ［１−プラグＧへの加熱を停止させ
る。When the driver switches the key switch S from the OFF terminal to the ON terminal to start the engine as shown in FIG. Condenser 11C as shown in figure (a)
3 (Fig. 3) until the terminal voltage V1 of 1 becomes the reference voltage V2.
1) As shown in ゛, timer T1 is set at time t1 as described later.
1, a high level output is produced. While the timer T1 is outputting a high level, C is output through the amplifier as shown in Figure 3 (power).
Relay 1 is turned ON. As a result, the relay 1 closes its contacts, a large voltage is supplied to the glow plug G, and the glow plug G rapidly rises in temperature as shown in Figure 3(e) for a short period of time (rated at 900 volts at a voltage of 12 pols 1-). ℃ for 6 seconds) to reach the required temperature of 600℃ or higher and 100℃ or lower, which is necessary to start the engine. When the outside temperature is low (e.g. -25℃)
(below) also uses timer T2 and timer T by water temperature sensor 6.
The output time of step 3 is extended to reach the required temperature. Also, by connecting key switch s (DON Cal+), timer T2
generates an output for a time T2 as shown in FIG. 3(1), lights up the lamp 5 of the display device as shown in FIG.
The light is turned off. As shown in FIG. 3 (1), when the output time t2 of the timer T2, which is the first preheating time, has elapsed, the timer T
Since the output of 2 is reversed to low level, timer T1
The reference voltage v2 is grounded in the timer lower 2 from the value determined by the resistors R2, R4, R5 and the diode D2 via the diode D4 and the resistor R6, and becomes V24 close to the ground level as shown in FIG. Therefore, the input voltage of comparator ○P becomes Vl > V2, and its output is inverted to low level, and relay 1 is changed as shown in Figure 3 (power).
[1- Stop heating to plug G].
予熱完了を示す表示装置のランプ５の表示（消灯）によ
って運転者が第３図（ア）に示す如くキースイッチＳを
ＳＴ下端子接続するとダイオードＤ５を介し、Ａ点が電
源電圧となるためダイア１−ドＤ４の作用でタイマＴ２
とダイオードＤ４、抵抗Ｒ６でタイマＴ１の基準電圧を
Ｖ２４に変更した機能を解消すると共に、ダイオードＤ
３おＪ：びＤ２の作用でタイマＴ１の電圧Ｖ２をＶ２２
へ更新し、タイマＴ１はその設定時限をｔｌｌよりｔ１
２へ延長され、クランキングにおけるバッテリー電圧の
低下および燃料噴射によるグロープラグＧの冷却を防止
し、第２図（ケ）に示す如くグロープラグ０を前記始動
に必要な温度範囲に保つ。ここでコンデンサＣ２はスイ
ッヂＳ＠Ｓ丁端子に接続したとぎ、比較器ＯＰの抵抗Ｒ
５を介した出力の正９ｉｉ） ３１による基準電圧のレ
ベルアップを制御しヒステリシス作用を解除し、設定時
限が確実に所定値となるように設りられている。このコ
ンデン’Ｊ’ Ｃ２がない場合、スイッチＳをＳＴ下端
子接続してもタイマＴ１の電圧Ｖ２はＯＰの出力がロー
レベルのときに対応するＶ２３までしか上置しく【いた
め、リレー１をＯＮにＪ−ることができない不具合が発
生する。When the driver connects the key switch S to the ST lower terminal as shown in FIG. 3 (A) when the lamp 5 of the display device indicates that preheating is complete (turns off), the power supply voltage is set at point A through the diode D5, so the dia. 1- Timer T2 is activated by the action of D4.
Diode D4 and resistor R6 eliminate the function of changing the reference voltage of timer T1 to V24, and diode D
3 OJ: The voltage V2 of timer T1 is changed to V22 by the action of D2 and D2.
and timer T1 changes its set time limit from tll to t1.
2 to prevent a drop in battery voltage during cranking and cooling of the glow plug G due to fuel injection, and to maintain the glow plug 0 within the temperature range necessary for the above-mentioned starting, as shown in FIG. 2(e). Here, when the capacitor C2 is connected to the switch S@S terminal, the resistor R of the comparator OP
9ii) of the output via 5 is controlled to increase the level of the reference voltage by 31, canceling the hysteresis effect, and ensuring that the set time period becomes a predetermined value. If this capacitor 'J' C2 is not present, even if switch S is connected to the ST lower terminal, the voltage V2 of timer T1 will only rise to V23, which corresponds to when the OP output is low level, so relay 1 is turned ON. A problem occurs in which it is not possible to
タイマＴ３は第３図（７Ｉ）に示す如くキースイッチＳ
をＳ下端子からＯＮ端子に戻したとき−から水温に応じ
て設定される出力時間１３の間ハイレベルの出力を生じ
、第３図（キ）に示す如くリレー２をＯＮにしアフター
グ日−を行なうためのリレー２制御用タイマである。Timer T3 is activated by key switch S as shown in Figure 3 (7I).
When the terminal is returned from the S lower terminal to the ON terminal, a high level output is generated for the output time 13 set according to the water temperature, and relay 2 is turned on as shown in Figure 3 (g) to start the afterglow. This is a timer for controlling relay 2.
電圧検出回路Ｂは電源電圧を検出し、所定値以上の場合
に電圧に応じてタイマＴ１を短縮するためのものであり
、電圧に応じてコンデン＋ＪＣ１への充電電流を変え、
過電圧時に於けるグロープラグＧの過熱を防止する。The voltage detection circuit B is for detecting the power supply voltage and shortening the timer T1 according to the voltage when it is higher than a predetermined value, and changing the charging current to the capacitor +JC1 according to the voltage.
To prevent overheating of glow plug G during overvoltage.
完爆検出回路Ｆは第３図（ア）に承り如くキースイッチ
Ｓを８丁端子からＯＮ端子に戻すことにより完爆を検出
してハイレベルの出力を生じ、第３図に示す如くコンデ
ンサＣ１を急速に充電し、比較器ＯＰの出力をローレベ
ルに転じリレー１をＯＦＦとし、グロープラグＧへの通
電を停止させて燃料の燃焼熱と通電によるジュール熱と
の両方によるグロープラグＧの過昇温を防止し、グロー
プラグＧを保護するように作用する。The complete explosion detection circuit F detects a complete explosion by returning the key switch S from the 8th terminal to the ON terminal as shown in FIG. The output of the comparator OP is changed to a low level, the relay 1 is turned off, and the energization to the glow plug G is stopped. It acts to prevent temperature rise and protect the glow plug G.
これにＪ：リドライバーがキースイッチＳをＯＮ端子に
接続し始動準備が完了してもＳＴ下端子接続をしない場
合、グロープラグＧへの通電を停」１させ、第３図（ケ
）に示す如く不用意にグ［］−プラグＧを高温にぜず、
耐久性を向上さＶることができ、またＳＴ下端子接続を
した場合、この機能を確実に解除させタイマＴ１を所定
時間動作させグロープラグＧを所定温度とする。In addition, if the ST lower terminal is not connected even after the redriver connects the key switch S to the ON terminal and the start preparation is completed, the power to the glow plug G is stopped. As shown, do not carelessly heat the plug []-plug G to high temperature.
Durability can be improved, and when the ST lower terminal is connected, this function is reliably released and the timer T1 is operated for a predetermined time to bring the glow plug G to a predetermined temperature.
なお電圧検出回路Ｂをここではコントローラーの電源電
圧を検出し作用させているが破線の如くグロープラグＧ
へ接続すれば、更に精度の高いものとすることができる
。Note that the voltage detection circuit B here detects and operates the power supply voltage of the controller, but as shown by the broken line, the glow plug G
If you connect it to , you can achieve even higher accuracy.
なお、この発明においては、第２図に示した補正回路に
おいてダイオードＤ３、Ｄ４、抵抗Ｒ４を省略した、よ
り簡単化した回路を補正回路どして用いることもできる
。その場合のコンパレータＯＰの入力電圧、タイマＴ１
、リレー１のタイムチャートは第４図の如くなる。In the present invention, a simpler circuit in which the diodes D3, D4 and the resistor R4 are omitted from the correction circuit shown in FIG. 2 can also be used as the correction circuit. In that case, the input voltage of comparator OP, timer T1
, the time chart of relay 1 is as shown in FIG.
以−Ｆの如く本発明のグロープラグの通電制御装置は、
加熱特性の同期をはかる簡便な同期回路に表示装置とタ
イマＴ１と連０」する補正回路を股Ｃプているので、確
実にエンジン始動ができグロープラグの信頼＋４１を向
トざυることができ、エンジン始動時のバラｊり一電斤
の低下および燃＄３１１！ｒｊ霧によるグロープラグ温
度の低下を防止できる。As shown below, the glow plug energization control device of the present invention includes:
A simple synchronization circuit that synchronizes the heating characteristics is combined with a correction circuit that connects the display device and timer T1 to zero, so the engine can be started reliably and the reliability of the glow plug can be improved by +41. I was able to do it, and when I started the engine, it took less power and the fuel cost was $311! It is possible to prevent the glow plug temperature from decreasing due to RJ fog.
第１図は本発明にかかるグロープラグへの通電装置の構
成を示すブロック図、第２図は本発明にかかるグロープ
ラグの通電制御装置の実施例を示す回路図、第３図はそ
の作動説明のためのタイムチャート、第４図は他の実施
例のタイムチｐ−１−である。
図中 １．２・・・リレー ３・・・電流制御用抵抗器
４・・・通電制御回路 ５・・・表示装置のランプＴ
Ｉ 、Ｆ２・・・タイマ ＯＰ・・・比較器 Ｃ１・・
・」ンデン１フ
第１図
ム
第２図
第３［１
叫ｐＩｌFIG. 1 is a block diagram showing the configuration of a glow plug energization device according to the present invention, FIG. 2 is a circuit diagram showing an embodiment of the glow plug energization control device according to the present invention, and FIG. 3 is an explanation of its operation. FIG. 4 is a time chart of another embodiment. In the figure 1.2... Relay 3... Current control resistor 4... Energization control circuit 5... Display device lamp T
I, F2...Timer OP...Comparator C1...
・'Nden 1F Figure 1 Figure 2 Figure 3 [1 Shout pIl
Claims (1)
電流を供給する急速昇温用通電リレー１と、該グロープ
ラグへ電流制御用抵抗器３を介して通電する温度維持用
通電リレー２と、グロープラグがエンジンの始動許容温
度以上になったとき運転者に認識させるだめの表示装置
５と、前記リレー１を制御するタイマＴ１と、リレー２
を制御するタイマ丁３と、前記表示装置を制御するタイ
マＴ２とからなり、通電開始後所定時間リレー１により
グロープラグに大電流を供給して前記グロープラグを急
速に昇温させ、所定時間経過後はリレー２を介して通電
して一定時間グローブラグの温度を維持するグロープラ
グの通電制御装置において、前記タイマ゛ｒ２の出力時
間の終了を入力とし前記タイマＴ１の出力を反転させて
リレー１をＯＦＦさせ、スタータモータへの通電信号を
入力Ｊることにより前記タイマＴ１の出力の反転を解消
する補正回路を設参りたことを特徴どするグロープラグ
の通電制御装置。1> @ Rapid heating type [1-Plug, energizing relay 1 for rapid temperature rise that supplies current to the glow plug, and energizer for temperature maintenance that energizes the glow plug via current control resistor 3 a relay 2, a display device 5 for making the driver aware when the temperature of the glow plug has reached the engine starting permissible temperature or higher, a timer T1 for controlling the relay 1, and a relay 2.
and a timer T2 that controls the display device, the relay 1 supplies a large current to the glow plug for a predetermined period of time after the start of energization to rapidly raise the temperature of the glow plug, and the timer T2 controls the display device. After that, in the glow plug energization control device that maintains the temperature of the globe lug for a certain period of time by energizing through relay 2, the end of the output time of the timer r2 is input, and the output of the timer T1 is inverted, and the relay 1 is activated. A glow plug energization control device comprising a correction circuit that eliminates the inversion of the output of the timer T1 by turning off the starter motor and inputting a energization signal to the starter motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11772183A JPS608473A (en) | 1983-06-28 | 1983-06-28 | Control device for curret conduction to glow plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11772183A JPS608473A (en) | 1983-06-28 | 1983-06-28 | Control device for curret conduction to glow plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS608473A true JPS608473A (en) | 1985-01-17 |
Family
ID=14718644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11772183A Pending JPS608473A (en) | 1983-06-28 | 1983-06-28 | Control device for curret conduction to glow plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS608473A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632872U (en) * | 1986-06-25 | 1988-01-09 |
-
1983
- 1983-06-28 JP JP11772183A patent/JPS608473A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632872U (en) * | 1986-06-25 | 1988-01-09 |
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